@import"https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700&family=Noto+Serif+SC:wght@500&display=swap";:root{--primary-red: #D8483E;--primary-red-hover: #C53830;--primary-red-light: #FFE3E0;--jade-green: #2F9D8A;--jade-green-hover: #258372;--jade-green-light: #E3F5F2;--gold-accent: #F0B762;--gold-hover: #E0952C;--text-primary: #1F2233;--text-secondary: #5E6075;--text-tertiary: #8A8C9F;--text-inverse: #FFFFFF;--app-bg: linear-gradient(135deg, #fffdf8 0%, #fdeee1 100%);--sidebar-bg: linear-gradient(180deg, rgba(255, 255, 255, .95), rgba(254, 243, 234, .85));--panel-bg: rgba(255, 255, 255, .9);--panel-border: rgba(222, 192, 173, .45);--bg-primary: rgba(255, 255, 255, .92);--bg-secondary: rgba(255, 250, 244, .65);--bg-tertiary: rgba(255, 255, 255, .6);--bg-accent: rgba(248, 229, 215, .6);--border-light: rgba(234, 210, 196, .7);--border-medium: rgba(210, 184, 170, .9);--border-dark: rgba(134, 99, 83, .8);--shadow-sm: 0 8px 20px rgba(216, 72, 62, .08);--shadow-md: 0 15px 30px rgba(31, 34, 51, .12);--shadow-lg: 0 25px 45px rgba(31, 34, 51, .16);--shadow-xl: 0 40px 60px rgba(31, 34, 51, .2);--spacing-xxs: .125rem;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--radius-sm: 6px;--radius-md: 12px;--radius-lg: 18px;--radius-xl: 28px;--radius-full: 9999px;--sidebar-width: 240px;--content-max-width: 700px;--body-bg: var(--app-bg);--lesson-card-max-width: 720px;--lesson-card-padding: var(--spacing-xl);--font-sans: "Plus Jakarta Sans", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-serif: "Noto Serif SC", "Playfair Display", serif;--transition-fast: .15s ease;--transition-base: .22s ease;--transition-slow: .35s ease}.dark-mode,body.dark-theme{--text-primary: #F8F9FA;--text-secondary: #DEE2E6;--text-tertiary: #ADB5BD;--text-inverse: #FDFEFE;--app-bg: linear-gradient(145deg, #10121a 0%, #1c1f2c 100%);--sidebar-bg: linear-gradient(180deg, rgba(22, 24, 32, .95), rgba(17, 20, 28, .92));--panel-bg: rgba(25, 28, 36, .9);--panel-border: rgba(255, 255, 255, .06);--bg-primary: #202331;--bg-secondary: #2a2f3f;--bg-tertiary: #343a4a;--bg-accent: rgba(45, 33, 33, .9);--border-light: rgba(255, 255, 255, .08);--border-medium: rgba(255, 255, 255, .12);--border-dark: rgba(255, 255, 255, .2);--shadow-sm: 0 8px 20px rgba(0, 0, 0, .35);--shadow-md: 0 15px 30px rgba(0, 0, 0, .4);--shadow-lg: 0 25px 45px rgba(0, 0, 0, .45);--shadow-xl: 0 40px 60px rgba(0, 0, 0, .55);--body-bg: var(--app-bg)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);color:var(--text-primary);background:var(--body-bg, var(--app-bg));line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.app-container{display:grid;grid-template-columns:var(--sidebar-width) minmax(0,1fr);min-height:100vh;background:var(--body-bg, var(--app-bg));position:relative}.sidebar{width:var(--sidebar-width);background:var(--sidebar-bg);border-right:1px solid var(--panel-border);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);display:flex;flex-direction:column;position:sticky;top:0;height:100vh;overflow-y:auto;box-shadow:var(--shadow-sm);z-index:2}.sidebar:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background-image:radial-gradient(rgba(216,72,62,.25) 1px,transparent 1px),radial-gradient(rgba(240,183,98,.3) 1px,transparent 1px);background-size:64px 64px,96px 96px;opacity:.15;pointer-events:none;mix-blend-mode:multiply}.sidebar-header{padding:var(--spacing-sm) var(--spacing-lg);border-bottom:1px solid var(--border-light);display:flex;align-items:center;justify-content:space-between;position:relative}.sidebar-header:after{content:"";position:absolute;inset:auto 20px -2px;height:3px;border-radius:var(--radius-full);background:linear-gradient(90deg,var(--primary-red),var(--gold-accent));opacity:.8}.app-logo{display:flex;align-items:center;justify-content:center;height:80px;padding:0;border:none;background:transparent;cursor:pointer;width:100%}.app-logo-image{height:100%;width:auto;display:block;clip-path:inset(0 0 0 0)}.logo-icon{font-size:2rem;line-height:1}.header-controls{display:flex;align-items:center;gap:var(--spacing-sm)}.language-switcher{display:flex;gap:2px;background:var(--bg-secondary);padding:2px;border-radius:var(--radius-md);border:1px solid var(--border-light)}.language-switcher button{padding:4px 8px;border:none;background:transparent;color:var(--text-secondary);font-size:.75rem;font-weight:600;border-radius:6px;cursor:pointer;transition:all var(--transition-fast);text-transform:uppercase;letter-spacing:.05em}.language-switcher button:hover{background:var(--bg-primary);color:var(--text-primary)}.language-switcher button.active{background:var(--primary-red);color:var(--text-inverse);box-shadow:var(--shadow-sm)}.theme-toggle{width:40px;height:40px;border-radius:var(--radius-md);border:1px solid var(--border-medium);background:var(--bg-secondary);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:1.25rem;transition:all var(--transition-base)}.theme-toggle:hover{background:var(--bg-tertiary);border-color:var(--border-dark);transform:scale(1.05)}.user-profile{padding:var(--spacing-xs) var(--spacing-md);display:flex;align-items:center;gap:var(--spacing-sm);background:var(--bg-accent);margin:var(--spacing-md) var(--spacing-md);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-base)}.user-profile:hover{background:var(--primary-red-light);transform:translate(2px);box-shadow:var(--shadow-sm)}.user-avatar{width:36px;height:36px;border-radius:var(--radius-full);background:linear-gradient(135deg,var(--primary-red),var(--gold-accent));color:var(--text-inverse);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1rem}.user-info{flex:1}.user-name{font-weight:600;color:var(--text-primary);font-size:.9rem;margin-bottom:.05rem}.user-level{font-size:.75rem;color:var(--text-secondary)}.sidebar-nav{flex:1;padding:var(--spacing-md);overflow-y:auto;display:flex;flex-direction:column;gap:var(--spacing-sm)}.sidebar-footer{padding:var(--spacing-md);border-top:1px solid var(--border-light);background:transparent}.sidebar-footer .nav-item{background:var(--bg-secondary)}.sidebar-footer .nav-item:hover{transform:translate(4px)}.nav-item{width:100%;padding:var(--spacing-xs) var(--spacing-md);border:none;background:var(--panel-bg);display:flex;align-items:center;justify-content:flex-start;gap:var(--spacing-sm);cursor:pointer;border-radius:var(--radius-md);transition:all var(--transition-base);color:var(--text-secondary);font-size:.85rem;font-weight:500;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid transparent}.nav-item:hover{background:var(--bg-primary);color:var(--text-primary);transform:translate(6px);box-shadow:var(--shadow-sm)}.nav-item.active{background:var(--primary-red-light);color:var(--primary-red);font-weight:600;box-shadow:var(--shadow-sm);border-color:#d8483e66}.nav-icon{width:32px;height:32px;display:inline-flex;align-items:center;justify-content:center}.nav-icon img{width:16px;height:16px;object-fit:contain;display:block}.nav-label{flex:1;text-align:left}.main-content{padding:var(--spacing-2xl) clamp(1.5rem,3vw,3.5rem);max-width:1080px;margin:0 auto;width:100%;position:relative;z-index:1;isolation:isolate}.home-container,.lessons-page-modern,.review-page,.theme-page-modern,.dictionary-page,.ai-assistant-page,.mini-games-page,.settings-page{width:100%;max-width:var(--content-max-width);margin-left:auto;margin-right:auto}.home-container{display:flex;flex-direction:column;gap:1.25rem;width:100%;max-width:var(--content-max-width);margin:0 auto var(--spacing-2xl)}.welcome-section{background:var(--welcome-gradient, linear-gradient(135deg, rgba(216, 72, 62, .92), rgba(240, 183, 98, .7)));color:var(--text-inverse);padding:1.75rem 2rem;border-radius:26px;box-shadow:var(--shadow-lg);position:relative;overflow:hidden}.welcome-section:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;mix-blend-mode:screen;opacity:.8;background-image:radial-gradient(circle at 25% 20%,rgba(255,255,255,.35),transparent 45%),radial-gradient(circle at 80% 0%,rgba(255,255,255,.25),transparent 45%)}.welcome-ornament{position:absolute;right:40px;bottom:20px;font-size:3.25rem;font-family:var(--font-serif);opacity:.25;color:#fff}.welcome-title{font-weight:600;font-size:1.3rem;letter-spacing:-.03em;position:relative;z-index:1;margin-bottom:.35rem}.welcome-section .user-name{font-size:1em;font-weight:inherit}.level-badge{display:inline-flex;align-items:center;gap:var(--spacing-xs);padding:calc(var(--spacing-xs) * .8) var(--spacing-sm);border-radius:var(--radius-full);font-size:.75rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--primary-red);background:#d8483e1f;border:1px solid rgba(216,72,62,.25)}.dark-mode .level-badge{color:#ffd6ce;background:#d8483e52;border-color:#fff3}.level-badge.on-dark{background:#ffffff2e;color:var(--text-inverse);border-color:#ffffff59}.welcome-section .level-badge{margin-top:var(--spacing-xs)}.main-cta{border:none;border-radius:var(--radius-lg);padding:1rem 1.5rem;font-size:1rem;font-weight:600;color:var(--text-inverse);background:linear-gradient(120deg,var(--primary-red),var(--gold-accent));box-shadow:var(--shadow-md);cursor:pointer;transition:transform var(--transition-base),box-shadow var(--transition-base);display:flex;align-items:center;justify-content:center;gap:.75rem;width:100%;margin-top:.75rem}.main-cta .arrow{display:inline-flex;font-size:1.25rem;transition:transform var(--transition-base)}.main-cta:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}.main-cta:hover .arrow{transform:translate(6px)}.page-title{font-size:1.3rem;font-weight:700;color:var(--text-primary);margin-bottom:var(--spacing-xs);letter-spacing:-.03em}.page-subtitle{font-size:.85rem;color:var(--text-secondary);margin-bottom:var(--spacing-xl)}.section-title{font-size:2rem;font-weight:600;color:var(--text-primary);margin-bottom:var(--spacing-md);letter-spacing:-.02em}.card{background:var(--bg-primary);border-radius:var(--radius-lg);padding:var(--spacing-md);box-shadow:var(--shadow-sm);border:1px solid var(--border-light);transition:all var(--transition-base)}.card:hover{box-shadow:var(--shadow-md);border-color:var(--border-medium)}.btn-primary{padding:var(--spacing-sm) var(--spacing-lg);background:var(--primary-red);color:var(--text-inverse);border:none;border-radius:var(--radius-md);font-weight:600;font-size:.9rem;cursor:pointer;transition:all var(--transition-base);box-shadow:var(--shadow-sm)}.btn-primary:hover:not(:disabled){background:var(--primary-red-hover);box-shadow:var(--shadow-md);transform:translateY(-1px)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{padding:var(--spacing-sm) var(--spacing-lg);background:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--border-medium);border-radius:var(--radius-md);font-weight:600;font-size:.9rem;cursor:pointer;transition:all var(--transition-base)}.btn-secondary:hover:not(:disabled){background:var(--bg-tertiary);border-color:var(--border-dark)}.btn-secondary:disabled{opacity:.5;cursor:not-allowed}.btn-danger{padding:var(--spacing-sm) var(--spacing-lg);background:#dc2626;color:#fff;border:none;border-radius:var(--radius-md);font-weight:600;font-size:.9rem;cursor:pointer;transition:all var(--transition-base)}.btn-danger:hover:not(:disabled){background:#b91c1c;box-shadow:0 4px 12px #dc26264d;transform:translateY(-1px)}.btn-danger:disabled{opacity:.5;cursor:not-allowed}input[type=text],input[type=email],input[type=password],input[type=number],textarea,select{width:100%;padding:var(--spacing-md) var(--spacing-lg);border:1px solid var(--border-medium);border-radius:var(--radius-md);font-size:1rem;font-family:var(--font-sans);color:var(--text-primary);background:var(--bg-primary);transition:all var(--transition-base)}input:focus,textarea:focus,select:focus{outline:none;border-color:var(--primary-red);box-shadow:0 0 0 3px var(--primary-red-light)}.lesson-flashcard{background:var(--bg-primary);border-radius:var(--radius-xl);padding:var(--lesson-card-padding);box-shadow:var(--shadow-lg);border:1px solid var(--border-light);text-align:center;width:100%;max-width:var(--lesson-card-max-width);margin:0 auto}.card-hanzi{font-size:4rem;font-weight:700;color:var(--text-primary);margin-bottom:var(--spacing-lg);font-family:var(--font-serif)}.card-pinyin{font-size:1.5rem;color:var(--text-secondary);margin-bottom:var(--spacing-md)}.card-audio-stack{display:flex;flex-direction:column;gap:.5rem;width:100%;align-items:center}.card-audio-stack .audio-button{width:50%;min-width:220px}.card-examples{margin-top:var(--spacing-lg);width:100%;padding:var(--spacing-md);border-radius:var(--radius-lg);border:1px solid var(--panel-border);background:var(--bg-secondary);text-align:left;display:flex;flex-direction:column;gap:var(--spacing-sm)}.card-examples h4{margin:0;font-size:.95rem;letter-spacing:.08em;color:var(--text-secondary);text-transform:uppercase}.card-examples .example-item{display:flex;flex-direction:column;gap:var(--spacing-xs);color:var(--text-primary)}.card-examples .example-pinyin,.card-examples .example-translation{color:var(--text-secondary);font-size:.95rem}.card-examples .audio-button{align-self:flex-start;min-width:auto;width:auto}.card-translation{font-size:1.25rem;color:var(--text-primary);font-weight:500;margin-top:var(--spacing-lg)}.progress-bar-bg{height:8px;background:var(--bg-tertiary);border-radius:var(--radius-full);overflow:hidden}.progress-bar-fg{height:100%;background:linear-gradient(90deg,var(--primary-red),var(--gold-accent));border-radius:var(--radius-full);transition:width var(--transition-slow)}.badge{display:inline-flex;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-xs) var(--spacing-md);background:var(--bg-tertiary);color:var(--text-primary);border-radius:var(--radius-full);font-size:.875rem;font-weight:500}.badge-primary{background:var(--primary-red-light);color:var(--primary-red)}.badge-success{background:var(--jade-green-light);color:var(--jade-green)}.next-lesson-section,.continue-section,.progress-section{background:transparent;border-radius:var(--radius-lg);padding:0;border:none;box-shadow:none}.section-badge{display:inline-flex;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-xs) var(--spacing-md);border-radius:var(--radius-full);text-transform:uppercase;font-size:.75rem;letter-spacing:.1em;font-weight:600;background:#d8483e1f;color:var(--primary-red)}.next-lesson-card{margin-top:var(--spacing-sm);display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md);border-radius:var(--radius-lg);border:1px solid var(--panel-border);cursor:pointer;transition:transform var(--transition-base),box-shadow var(--transition-base);background:var(--panel-bg)}.next-lesson-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}.play-button{width:48px;height:48px;border-radius:var(--radius-full);background:var(--primary-red-light);color:var(--primary-red);display:flex;align-items:center;justify-content:center;font-size:1.5rem}.continue-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--spacing-md);margin-top:var(--spacing-md)}.continue-card{border-radius:var(--radius-lg);padding:1rem;border:1px solid var(--panel-border);background:var(--panel-bg);display:flex;flex-direction:column;gap:var(--spacing-xs);align-items:flex-start;box-shadow:var(--shadow-sm)}.continue-icon{width:40px;height:40px;border-radius:var(--radius-full);background:var(--jade-green-light);color:var(--jade-green);display:flex;align-items:center;justify-content:center;font-size:1.1rem}.continue-icon img{width:20px;height:20px;object-fit:contain;display:block}.continue-badge{font-size:.75rem;text-transform:uppercase;letter-spacing:.1em;color:var(--text-secondary);margin-bottom:var(--spacing-sm)}.continue-title{font-size:.95rem;font-weight:600;color:var(--text-primary);margin-bottom:var(--spacing-xs)}.continue-subtitle{font-size:.8rem;color:var(--text-secondary);margin-bottom:var(--spacing-xs)}.continue-btn{border:none;background:var(--primary-red-light);color:var(--primary-red);padding:var(--spacing-xs) var(--spacing-md);border-radius:var(--radius-full);font-weight:600;cursor:pointer;transition:background var(--transition-base),transform var(--transition-base)}.continue-btn:hover:not(.disabled){background:#d8483e26;transform:translate(4px)}.continue-btn.disabled,.continue-btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.progress-summary{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:var(--spacing-lg);margin-top:var(--spacing-lg)}.total-words{display:flex;flex-direction:column}.total-number{font-size:1.8rem;font-weight:700;color:var(--primary-red)}.total-label{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.1em;font-size:.85rem}.stats-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:var(--spacing-sm);margin-bottom:var(--spacing-lg)}.stat-card{background:var(--panel-bg);padding:.85rem 1rem;border-radius:var(--radius-md);box-shadow:var(--shadow-sm);border:1px solid var(--panel-border);position:relative;overflow:hidden;display:flex;flex-direction:column;gap:var(--spacing-xs);min-height:90px}.stat-label{font-size:.7rem;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.08em;font-weight:600;margin-bottom:.2rem}.stat-value{font-size:1.5rem;font-weight:600;color:var(--primary-red);line-height:1}.stat-icon{width:26px;height:26px;border-radius:var(--radius-full);background:var(--primary-red-light);color:var(--primary-red);display:flex;align-items:center;justify-content:center;font-size:1rem;margin-bottom:.2rem}.stat-icon img{width:18px;height:18px;object-fit:contain;display:block}.lessons-page{display:flex;flex-direction:column;gap:var(--spacing-xl)}.lessons-header{background:var(--panel-bg);border:1px solid var(--panel-border);border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-sm)}.lessons-paths-list{display:flex;flex-direction:column;gap:var(--spacing-lg)}.lesson-path-section{padding:var(--spacing-lg);border-radius:var(--radius-lg);border:1px solid var(--panel-border);background:var(--panel-bg);box-shadow:var(--shadow-sm);position:relative;overflow:hidden}.lesson-path-section:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:radial-gradient(circle at 85% 15%,rgba(240,183,98,.18),transparent 55%);pointer-events:none}.path-header-bar{display:flex;align-items:center;gap:var(--spacing-lg);margin-bottom:var(--spacing-md);padding-bottom:var(--spacing-md);border-bottom:1px solid var(--border-light)}.path-icon-badge{width:44px;height:44px;border-radius:var(--radius-md);background:var(--bg-tertiary);display:flex;align-items:center;justify-content:center;font-size:1.3rem}.path-name{flex:1;font-size:1.25rem;font-weight:700;color:var(--text-primary)}.path-progress-badge{font-size:.85rem;color:var(--text-secondary);background:#ffffff14;padding:var(--spacing-xs) var(--spacing-md);border-radius:var(--radius-full);font-weight:600}.path-description-text{font-size:.85rem;color:var(--text-secondary);margin-bottom:var(--spacing-md);max-width:100%}.path-lessons-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:var(--spacing-lg)}.lesson-path-card{position:relative;border-radius:var(--radius-lg);border:1px solid transparent;padding:var(--spacing-md);background:linear-gradient(180deg,#ffffff0f,#ffffff05);transition:transform var(--transition-base),box-shadow var(--transition-base),border-color var(--transition-base);cursor:pointer;min-height:150px;display:flex;flex-direction:column;gap:var(--spacing-sm)}.lesson-path-card:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;border-radius:inherit;padding:1px;background:linear-gradient(120deg,#d8483e59,#f0b76259);-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:opacity var(--transition-base);pointer-events:none}.lesson-path-card:not(.locked):hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.lesson-path-card:not(.locked):hover:before{opacity:1}.lesson-path-card.locked{opacity:.5;cursor:not-allowed}.lesson-path-card.completed{border-color:#2f9d8a80;background:linear-gradient(180deg,#2f9d8a2e,#2f9d8a0d)}.lesson-card-header{display:flex;justify-content:space-between;align-items:center;font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-secondary)}.lesson-index{font-weight:700}.lesson-status-icon{font-size:1.2rem}.lesson-card-title{font-size:1.05rem;color:var(--text-primary);font-weight:600;line-height:1.4}.lesson-card-footer{display:flex;justify-content:space-between;align-items:center;font-size:.85rem;color:var(--text-secondary)}.lesson-duration{display:inline-flex;align-items:center;gap:var(--spacing-xs)}.lesson-start-arrow{color:var(--primary-red);font-size:1.1rem;font-weight:700}.lessons-page-modern{width:100%;max-width:var(--content-max-width);margin:0 auto var(--spacing-2xl);padding:0;display:flex;flex-direction:column;gap:var(--spacing-xl)}.continue-lesson-section{display:flex;flex-direction:column;gap:var(--spacing-sm)}.continue-lesson-badge{display:inline-flex;align-items:center;gap:var(--spacing-xs);font-size:.75rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--text-secondary)}.sparkle-icon{font-size:1rem}.continue-lesson-card{position:relative;background:linear-gradient(135deg,var(--primary-red),var(--gold-accent));border-radius:var(--radius-lg);padding:var(--spacing-lg);cursor:pointer;transition:transform var(--transition-base),box-shadow var(--transition-base);overflow:hidden}.continue-lesson-card:before{content:"";position:absolute;top:0;right:0;width:200px;height:200px;background:radial-gradient(circle,rgba(255,255,255,.15),transparent);border-radius:50%;transform:translate(50%,-50%);pointer-events:none}.continue-lesson-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.continue-lesson-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-sm);position:relative;z-index:1}.continue-lesson-path{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:#ffffffe6}.continue-lesson-status{font-size:.75rem;font-weight:600;color:#ffffffe6;background:#fff3;padding:calc(var(--spacing-xxs) * 2) var(--spacing-md);border-radius:var(--radius-full)}.continue-lesson-title{font-size:1.5rem;font-weight:700;color:#fff;margin-bottom:var(--spacing-sm);position:relative;z-index:1}.continue-lesson-meta{display:flex;align-items:center;gap:var(--spacing-xs);font-size:.85rem;color:#ffffffd9;margin-bottom:var(--spacing-md);position:relative;z-index:1}.continue-lesson-duration,.continue-lesson-progress{display:flex;align-items:center;gap:var(--spacing-xxs)}.continue-lesson-progress-bar{width:100%;height:6px;background:#ffffff40;border-radius:var(--radius-full);overflow:hidden;position:relative;z-index:1}.continue-lesson-progress-fill{height:100%;background:#fff;border-radius:var(--radius-full);transition:width .3s ease}.continue-lesson-button{position:absolute;bottom:calc(var(--spacing-lg) + .75rem);right:var(--spacing-lg);width:48px;height:48px;border-radius:var(--radius-full);background:#fff;color:var(--primary-red);border:none;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:transform var(--transition-fast);box-shadow:0 4px 12px #00000026;z-index:2}.continue-lesson-button:hover{transform:scale(1.1)}.paths-section{display:flex;flex-direction:column;gap:var(--spacing-md)}.paths-section-title{font-size:.75rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--text-secondary);margin:0}.paths-list{display:flex;flex-direction:column;gap:var(--spacing-md)}.path-item{background:var(--panel-bg);border:1px solid var(--panel-border);border-radius:var(--radius-lg);overflow:hidden;transition:box-shadow var(--transition-base)}.path-item:hover{box-shadow:var(--shadow-sm)}.path-item-header{width:100%;display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md);background:transparent;border:none;cursor:pointer;text-align:left;transition:background var(--transition-base)}.path-item-header:hover{background:var(--bg-secondary)}.path-item-icon{width:40px;height:40px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;background:var(--bg-tertiary);border-radius:var(--radius-md);flex-shrink:0}.path-item-info{flex:1;min-width:0}.path-item-title{font-size:.95rem;font-weight:600;color:var(--text-primary);margin:0 0 var(--spacing-xxs) 0}.path-item-subtitle{font-size:.8rem;color:var(--text-secondary);margin:0}.path-item-right{display:flex;align-items:center;gap:var(--spacing-sm);flex-shrink:0}.path-item-progress{font-size:.85rem;font-weight:600;color:var(--text-secondary)}.path-item-chevron{display:flex;align-items:center;justify-content:center;color:var(--text-secondary);transition:transform var(--transition-base)}.path-item-chevron.expanded{transform:rotate(180deg)}.path-item-lessons{display:flex;flex-direction:column;border-top:1px solid var(--border-light)}.lesson-item{width:100%;display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md);background:transparent;border:none;border-bottom:1px solid var(--border-light);cursor:pointer;text-align:left;transition:background var(--transition-base);position:relative}.lesson-item:last-child{border-bottom:none}.lesson-item:not(.locked):hover{background:var(--bg-secondary)}.lesson-item.locked{opacity:.5;cursor:not-allowed}.lesson-item.active{background:#d8483e0d;border-left:3px solid var(--primary-red)}.lesson-item.completed{opacity:.7}.lesson-item-indicator{width:24px;height:24px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.lesson-bullet{width:12px;height:12px;border-radius:50%;border:2px solid var(--primary-red);background:transparent}.lesson-check{color:var(--jade-green)}.lesson-lock{color:var(--text-tertiary)}.lesson-item-content{flex:1;min-width:0}.lesson-item-title{font-size:.9rem;font-weight:500;color:var(--text-primary);margin-bottom:var(--spacing-xxs)}.lesson-item-meta{display:flex;align-items:center;gap:var(--spacing-xs);font-size:.75rem;color:var(--text-secondary)}.lesson-item-meta svg{flex-shrink:0}.lesson-item-completion{color:var(--text-tertiary)}.lesson-item-action{width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:var(--primary-red-light);color:var(--primary-red);border-radius:var(--radius-full);flex-shrink:0;transition:transform var(--transition-fast)}.lesson-item:hover .lesson-item-action{transform:scale(1.1)}@media (max-width: 768px){.lessons-page-modern{padding:var(--spacing-md)}.continue-lesson-title{font-size:1.25rem}.path-item-icon{width:36px;height:36px;font-size:1.3rem}.lesson-item{padding:var(--spacing-sm)}}.lesson-page{width:100%;max-width:var(--lesson-card-max-width);margin:0 auto;padding:var(--spacing-xl);border-radius:var(--radius-xl);border:1px solid var(--panel-border);background:var(--panel-bg);box-shadow:var(--shadow-md);text-align:center}.lesson-hanzi-main{font-size:3.2rem;font-family:var(--font-serif);margin:var(--spacing-sm) 0;color:var(--text-primary)}.lesson-pinyin{font-size:1.2rem;color:var(--text-secondary);margin-bottom:var(--spacing-xs)}.lesson-translation-main{font-size:1.2rem;color:var(--text-primary);font-weight:600;margin-bottom:var(--spacing-sm)}.lesson-nav{display:flex;justify-content:space-between;margin:var(--spacing-lg) 0}.lesson-nav button{border:none;background:var(--bg-secondary);color:var(--text-primary);padding:var(--spacing-sm) var(--spacing-lg);border-radius:var(--radius-full);font-weight:600;cursor:pointer;transition:all var(--transition-base)}.lesson-nav button:hover{background:var(--primary-red-light);color:var(--primary-red)}.lesson-examples{margin-top:var(--spacing-xl);text-align:left;display:flex;flex-direction:column;gap:var(--spacing-sm)}.example-card{padding:var(--spacing-sm);border-radius:var(--radius-md);border:1px solid var(--panel-border);background:var(--bg-secondary)}.structured-lesson{width:100%;max-width:var(--lesson-card-max-width);margin:0 auto;display:flex;flex-direction:column;gap:var(--spacing-xl)}.lesson-header,.lesson-intro-container,.lesson-empty-state,.lesson-flashcard,.quiz-container,.completion-container,.review-session-card,.review-flashcard,.grammar-explanation-card{width:100%;max-width:var(--lesson-card-max-width);margin-left:auto;margin-right:auto}.lesson-card,.lesson-header,.lesson-intro-container,.lesson-empty-state,.lesson-flashcard,.quiz-container,.completion-container,.review-session-card,.review-flashcard{width:min(100%,var(--lesson-card-max-width));margin-left:auto;margin-right:auto}.lesson-empty-state{background:var(--panel-bg);border:1px solid var(--panel-border);border-radius:var(--radius-lg);padding:var(--spacing-lg);text-align:center;color:var(--text-secondary)}.lesson-intro-container{background:var(--panel-bg);border:1px solid var(--panel-border);border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-md)}.back-btn{border:none;background:var(--bg-secondary);color:var(--text-primary);padding:var(--spacing-xs) var(--spacing-md);border-radius:var(--radius-full);cursor:pointer;font-weight:600}.back-btn:hover{background:var(--primary-red-light);color:var(--primary-red)}.intro-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-lg)}.lesson-badge{background:var(--primary-red-light);color:var(--primary-red);padding:var(--spacing-xs) var(--spacing-md);border-radius:var(--radius-full);font-weight:600}.intro-content{display:flex;flex-direction:column;gap:var(--spacing-lg)}.objectives-section ul{list-style:none;padding-left:0;display:flex;flex-direction:column;gap:var(--spacing-xs)}.lesson-stats{display:flex;gap:var(--spacing-lg);flex-wrap:wrap}.lesson-stats .stat{background:var(--bg-secondary);border-radius:var(--radius-md);padding:var(--spacing-xs) var(--spacing-sm);display:inline-flex;align-items:center;gap:var(--spacing-xs)}.start-lesson-btn{border:none;border-radius:var(--radius-full);padding:var(--spacing-xs) var(--spacing-lg);font-size:.95rem;font-weight:600;color:var(--text-inverse);background:linear-gradient(120deg,var(--primary-red),var(--gold-accent));cursor:pointer;align-self:flex-start}.start-lesson-btn:hover{opacity:.9}.lesson-header{display:flex;justify-content:space-between;align-items:center;background:var(--panel-bg);border:1px solid var(--panel-border);border-radius:var(--radius-lg);padding:var(--spacing-md);box-shadow:var(--shadow-sm)}.progress-indicator{display:flex;flex-direction:column;gap:var(--spacing-xs);min-width:180px}.lesson-flashcard-container{margin-top:var(--spacing-lg)}.lesson-flashcard-actions{margin-top:var(--spacing-lg);display:flex;justify-content:space-between}.quiz-container,.completion-container{background:var(--panel-bg);border:1px solid var(--panel-border);border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-sm)}.completion-warning{margin-top:var(--spacing-sm);color:var(--primary-red);font-weight:600}.quiz-word{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-lg)}.quiz-word-header{width:100%;display:flex;justify-content:flex-end}.quiz-hanzi-row{display:flex;align-items:center;gap:var(--spacing-md)}.quiz-question{text-align:center;margin-bottom:var(--spacing-md);font-size:1.1rem}.quiz-hanzi{font-size:2.5rem;font-family:var(--font-serif)}.quiz-pinyin{color:var(--text-secondary)}.quiz-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--spacing-md)}.quiz-option{border-radius:var(--radius-md);border:1px solid var(--panel-border);padding:var(--spacing-sm);background:var(--bg-secondary);cursor:pointer;font-weight:600}.quiz-option.correct{border-color:var(--jade-green);background:var(--jade-green-light)}.quiz-option.incorrect{border-color:var(--primary-red);background:var(--primary-red-light)}@media (max-width: 640px){.quiz-options{grid-template-columns:1fr}}.quiz-feedback-text{min-height:1.5rem;color:var(--text-secondary)}.quiz-footer{margin-top:var(--spacing-md);display:flex;justify-content:space-between;align-items:center}.quiz-progress-text{color:var(--text-secondary)}.quiz-next-btn{display:inline-flex;align-items:center;gap:var(--spacing-xs)}.completion-container{text-align:center}.completion-icon{font-size:2rem;margin-bottom:var(--spacing-sm)}.completion-title{font-size:1.5rem;margin-bottom:var(--spacing-sm)}.completion-score{margin-bottom:var(--spacing-xl)}.completion-actions{display:flex;justify-content:center;gap:var(--spacing-lg);flex-wrap:wrap}.structured-lesson .score-circle{width:140px;height:140px;margin:0 auto var(--spacing-sm)}.dictation-game{max-width:100%;margin:0}.game-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-xl);padding:var(--spacing-md);background:var(--bg-primary);border-radius:var(--radius-md);box-shadow:var(--shadow-sm)}.game-progress{flex:1;margin-right:var(--spacing-xl)}.progress-text{font-size:.875rem;font-weight:600;color:var(--text-secondary);margin-bottom:var(--spacing-sm)}.game-score{font-size:1rem;font-weight:700;color:var(--text-primary);display:flex;align-items:center;gap:var(--spacing-xs)}.dictation-level{display:flex;align-items:center;gap:var(--spacing-sm);margin-top:var(--spacing-sm)}.game-content{background:var(--bg-primary);padding:var(--spacing-xl);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);text-align:center}.audio-play-btn{width:100px;height:100px;border-radius:var(--radius-full);background:linear-gradient(135deg,var(--primary-red),var(--gold-accent));color:var(--text-inverse);border:none;cursor:pointer;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--spacing-sm);margin:0 auto var(--spacing-xl);transition:all var(--transition-base);box-shadow:var(--shadow-lg)}.audio-play-btn:hover:not(:disabled){transform:scale(1.05);box-shadow:var(--shadow-xl)}.audio-play-btn:disabled{opacity:.7;cursor:not-allowed}.play-hint{font-size:.875rem;font-weight:600}.dictation-input{font-size:1.5rem;text-align:center;padding:var(--spacing-lg);margin-bottom:var(--spacing-lg)}.input-actions{display:flex;gap:var(--spacing-md);justify-content:center}.answer-reveal{margin-top:var(--spacing-xl)}.reveal-card{padding:var(--spacing-xl);border-radius:var(--radius-lg);border:2px solid}.reveal-header{display:flex;align-items:center;justify-content:space-between;gap:var(--spacing-md)}.reveal-card.correct{background:var(--jade-green-light);border-color:var(--jade-green)}.reveal-card.incorrect{background:#ffe5e7;border-color:var(--primary-red)}.reveal-hanzi{font-size:2.5rem;font-weight:700;font-family:var(--font-serif);margin-bottom:var(--spacing-sm)}.reveal-pinyin{font-size:1.1rem;color:var(--text-secondary);margin-bottom:var(--spacing-xs)}.reveal-translation{font-size:1rem;color:var(--text-primary);margin-bottom:var(--spacing-sm)}.your-answer{font-size:.9375rem;color:var(--text-secondary);padding-top:var(--spacing-md);border-top:1px solid var(--border-light)}.reveal-actions{margin-top:var(--spacing-lg);display:flex;justify-content:center;gap:var(--spacing-md);flex-wrap:wrap}.game-results{text-align:center;padding:var(--spacing-2xl)}.results-title{font-size:2rem;font-weight:700;color:var(--text-primary);margin-bottom:var(--spacing-xl)}.results-score{margin-bottom:var(--spacing-2xl)}.score-circle{width:160px;height:160px;border-radius:var(--radius-full);background:linear-gradient(135deg,var(--primary-red-light),var(--jade-green-light));display:flex;align-items:center;justify-content:center;margin:0 auto var(--spacing-md);border:3px solid var(--primary-red)}.dictionary-page{display:flex;flex-direction:column;gap:var(--spacing-xl)}.dictionary-header{background:var(--panel-bg);padding:var(--spacing-lg);border-radius:var(--radius-lg);border:1px solid var(--panel-border);box-shadow:var(--shadow-sm)}.dictionary-subtitle{color:var(--text-secondary);margin-top:var(--spacing-xs)}.dictionary-search,.dictionary-search-box{position:relative}.dictionary-search-input{width:100%;padding:var(--spacing-md);border-radius:var(--radius-lg);border:1px solid var(--border-light);background:var(--bg-primary);font-size:.95rem;box-shadow:var(--shadow-sm)}.dictionary-clear-btn{position:absolute;right:var(--spacing-md);top:50%;transform:translateY(-50%);border:none;background:var(--primary-red-light);color:var(--primary-red);width:36px;height:36px;border-radius:var(--radius-full);cursor:pointer}.search-history-dropdown{position:absolute;top:calc(100% + var(--spacing-xs));left:0;right:0;background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);z-index:100;max-height:300px;overflow-y:auto}.search-history-header{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing-sm) var(--spacing-md);border-bottom:1px solid var(--border-light);font-size:.85rem;font-weight:600;color:var(--text-secondary)}.search-history-clear{background:none;border:none;color:var(--primary-red);font-size:.8rem;cursor:pointer;padding:var(--spacing-xs);border-radius:var(--radius-sm);transition:all .2s ease}.search-history-clear:hover{background:var(--primary-red-light)}.search-history-item{width:100%;display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);border:none;background:none;text-align:left;cursor:pointer;font-size:.9rem;color:var(--text-primary);transition:all .2s ease}.search-history-item:hover{background:var(--bg-secondary)}.search-history-item span:first-child{opacity:.5;font-size:.85rem}.dictionary-filter-group{margin-top:var(--spacing-md)}.filter-label{display:block;font-size:.85rem;font-weight:600;color:var(--text-secondary);margin-bottom:var(--spacing-sm)}.dictionary-search-type-filters{display:flex;flex-wrap:wrap;gap:var(--spacing-sm)}.search-type-chip{padding:var(--spacing-xs) var(--spacing-md);border-radius:var(--radius-full);border:1px solid var(--border-light);background:var(--bg-primary);color:var(--text-primary);font-size:.85rem;font-weight:500;cursor:pointer;transition:all .2s ease}.search-type-chip:hover{border-color:var(--primary-red);background:var(--primary-red-light);color:var(--primary-red)}.search-type-chip.active{background:var(--primary-red);color:#fff;border-color:var(--primary-red);box-shadow:var(--shadow-sm)}.dictionary-level-filters{display:flex;flex-wrap:wrap;gap:var(--spacing-sm)}.dictionary-tip{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md);border-radius:var(--radius-lg);border:1px solid var(--panel-border);background:var(--bg-secondary);margin-top:var(--spacing-md);box-shadow:var(--shadow-sm)}.tip-icon{width:40px;height:40px;border-radius:var(--radius-full);background:var(--primary-red-light);display:flex;align-items:center;justify-content:center;color:var(--primary-red);font-size:1.2rem}.tip-title{font-weight:600;margin:0}.tip-subtitle{margin:0;color:var(--text-secondary);font-size:.9rem}.level-chip{border-radius:var(--radius-full);border:1px solid var(--border-light);padding:var(--spacing-xs) var(--spacing-md);background:var(--bg-secondary);color:var(--text-secondary);font-size:.85rem;cursor:pointer}.level-chip.active{border-color:var(--primary-red);background:var(--primary-red-light);color:var(--primary-red)}.dictionary-content{display:grid;gap:var(--spacing-xl)}.dictionary-results,.dictionary-detail{background:var(--bg-primary);border-radius:var(--radius-xl);padding:var(--spacing-xl);border:1px solid var(--border-light);box-shadow:var(--shadow-sm)}.dictionary-results{display:flex;flex-direction:column;gap:var(--spacing-sm)}.dictionary-placeholder{padding:var(--spacing-sm);border-radius:var(--radius-lg);background:var(--bg-secondary);color:var(--text-secondary);font-size:.9rem;text-align:center}.dictionary-result-item{display:grid;grid-template-columns:90px 1fr auto;gap:var(--spacing-md);align-items:center;padding:var(--spacing-md);border-radius:var(--radius-lg);border:1px solid transparent;background:var(--panel-bg);cursor:pointer;transition:all var(--transition-base);text-align:left}.dictionary-result-item:hover{border-color:var(--border-light);box-shadow:var(--shadow-sm);transform:translate(4px)}.dictionary-result-item.active{border-color:var(--primary-red);background:var(--primary-red-light)}.result-hanzi{font-size:1.75rem;font-family:var(--font-serif);color:var(--text-primary)}.result-pinyin{font-weight:600;color:var(--text-secondary)}.result-level{justify-self:end}.result-level .level-badge{margin-top:0}.dictionary-empty{text-align:center;padding:var(--spacing-md);color:var(--text-secondary);border:1px dashed var(--panel-border);border-radius:var(--radius-lg);background:var(--bg-secondary)}.dictionary-detail{display:flex;flex-direction:column;gap:var(--spacing-lg)}.list-manager{display:flex;gap:var(--spacing-sm);align-items:center;margin-top:var(--spacing-sm)}.list-manager select{flex:1;padding:var(--spacing-sm);border-radius:var(--radius-md);border:1px solid var(--border-light);background:var(--bg-secondary)}.list-create{display:flex;gap:var(--spacing-sm)}.list-create input{flex:1;padding:var(--spacing-sm);border-radius:var(--radius-md);border:1px solid var(--border-light);background:var(--bg-primary)}.list-feedback{margin-top:var(--spacing-xs);font-size:.85rem;color:var(--jade-green)}.list-empty-hint{color:var(--text-secondary);font-size:.9rem}.list-picker-panel{margin-top:var(--spacing-sm);border:1px solid var(--panel-border);border-radius:var(--radius-md);padding:var(--spacing-sm);background:var(--bg-secondary);display:flex;flex-direction:column;gap:var(--spacing-xs)}.list-picker-panel.compact{padding:var(--spacing-sm);gap:var(--spacing-xs);background:var(--bg-primary);border-radius:var(--radius-md);box-shadow:none}.list-picker-panel.compact .list-manager{flex-direction:column;align-items:stretch;margin-top:0}.list-picker-panel.compact .list-create{flex-direction:column}.custom-lists-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:var(--spacing-sm)}.custom-list-card{border:1px solid var(--panel-border);border-radius:var(--radius-md);padding:var(--spacing-sm);background:var(--bg-primary);display:flex;justify-content:space-between;align-items:center}.list-name{font-weight:600;color:var(--text-primary)}.list-count{font-size:.85rem;color:var(--text-secondary)}.list-delete-btn{border:none;background:#d8483e1f;color:var(--primary-red);padding:var(--spacing-xxs) var(--spacing-sm);border-radius:var(--radius-full);cursor:pointer}.detail-header{display:flex;align-items:center;justify-content:space-between}.detail-hanzi-large{font-size:3.2rem;font-family:var(--font-serif);font-weight:700}.detail-section{padding-bottom:var(--spacing-md);border-bottom:1px solid var(--border-light)}.detail-label{font-size:.85rem;text-transform:uppercase;color:var(--text-secondary);letter-spacing:.1em;margin-bottom:var(--spacing-xs)}.detail-value{font-size:1rem;color:var(--text-primary)}.detail-value .level-badge{margin-top:0}.detail-tags{display:flex;flex-wrap:wrap;gap:var(--spacing-xs)}.detail-tag{padding:var(--spacing-xs) var(--spacing-md);border-radius:var(--radius-full);background:var(--bg-tertiary);font-size:.85rem}.detail-examples{display:flex;flex-direction:column;gap:var(--spacing-md)}.detail-example{padding:var(--spacing-sm);border-radius:var(--radius-md);background:var(--bg-secondary)}.example-hanzi{font-size:1.15rem;font-weight:600}.example-pinyin{color:var(--text-secondary);margin:var(--spacing-xs) 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var(--spacing-md);background:var(--bg-primary);resize:none;min-height:40px;max-height:120px;font-family:inherit;font-size:.95rem;line-height:1.5}.chat-input-container .chat-input:focus{outline:none;border-color:var(--primary-red);box-shadow:0 0 0 2px var(--primary-red-light)}.send-button{background:var(--primary-red);color:#fff;border:none;border-radius:var(--radius-full);width:40px;height:40px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s ease;flex-shrink:0}.send-button:hover:not(:disabled){background:var(--primary-red);transform:translateY(-1px);box-shadow:var(--shadow-md)}.send-button:disabled{opacity:.5;cursor:not-allowed}.suggested-questions{padding:var(--spacing-md);border-top:1px solid var(--border-light);background:var(--bg-secondary)}.suggested-label{font-size:.85rem;font-weight:600;color:var(--text-secondary);margin-bottom:var(--spacing-sm)}.suggested-buttons{display:flex;flex-wrap:wrap;gap:var(--spacing-xs)}.suggested-button{padding:var(--spacing-xs) var(--spacing-md);border-radius:var(--radius-full);border:1px solid var(--border-light);background:var(--bg-primary);color:var(--text-secondary);font-size:.85rem;cursor:pointer;transition:all .2s ease}.suggested-button:hover{background:var(--primary-red-light);color:var(--primary-red);border-color:var(--primary-red)}.markdown-h1,.markdown-h2,.markdown-h3{font-weight:600;margin:var(--spacing-sm) 0;color:var(--text-primary)}.markdown-h1{font-size:1.5rem}.markdown-h2{font-size:1.25rem}.markdown-h3{font-size:1.1rem}.markdown-p{margin:var(--spacing-xs) 0}.markdown-list{margin:var(--spacing-sm) 0;padding-left:var(--spacing-lg)}.markdown-list li{margin:var(--spacing-xs) 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var(--spacing-md);border-radius:var(--radius-full);font-weight:600;cursor:pointer}.review-mode-toggle button.active{background:var(--primary-red-light);color:var(--primary-red)}.review-stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--spacing-lg)}.review-stat-card{border-radius:var(--radius-lg);padding:var(--spacing-md);color:var(--text-inverse);display:flex;flex-direction:column;gap:var(--spacing-xs);position:relative;overflow:hidden}.review-stat-card:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;opacity:.2;background:radial-gradient(circle at 80% 20%,#ffffff,transparent 60%)}.review-stat-card.stat-green{background:#2f9d8a1f;color:var(--text-primary);border:1px solid rgba(47,157,138,.35)}.review-stat-card.stat-blue{background:#4f6de61f;color:var(--text-primary);border:1px solid rgba(79,109,230,.35)}.review-stat-card.stat-pink{background:#d8483e1f;color:var(--text-primary);border:1px solid rgba(216,72,62,.35)}.review-stat-card 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var(--spacing-lg);border-radius:var(--radius-full);border:1px solid var(--border-light);background:var(--bg-secondary);color:var(--text-primary);font-weight:600;cursor:pointer;transition:all var(--transition-base)}.audio-button:hover:not(:disabled){border-color:var(--primary-red);background:var(--primary-red-light);color:var(--primary-red);box-shadow:var(--shadow-sm)}.audio-button.playing{border-color:var(--jade-green);background:var(--jade-green-light);color:var(--jade-green)}.audio-button.error{border-color:var(--primary-red);color:var(--primary-red);cursor:not-allowed}.audio-icon{font-size:1.2rem}.audio-pulse{width:6px;height:6px;border-radius:50%;background:currentColor;animation:audio-pulse .8s infinite ease-in-out alternate}@keyframes 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.level-badge{margin-bottom:var(--spacing-sm)}.theme-page-modern{display:flex;flex-direction:column;gap:var(--spacing-2xl)}.theme-hero-panel{position:relative;border-radius:var(--radius-xl);padding:var(--spacing-xl);background:var(--welcome-gradient, linear-gradient(120deg, rgba(216, 72, 62, .9), rgba(240, 183, 98, .7)));color:var(--text-inverse);overflow:hidden;display:grid;grid-template-columns:3fr 1fr;gap:var(--spacing-xl);min-height:220px}.hero-panel-text h1{margin:var(--spacing-xs) 0;font-size:2rem;color:var(--text-inverse)}.hero-kicker{text-transform:uppercase;letter-spacing:.2em;font-size:.8rem;opacity:.9}.hero-actions{display:flex;gap:var(--spacing-md);margin-top:var(--spacing-lg)}.hero-stat{background:#ffffff26;border-radius:var(--radius-lg);padding:var(--spacing-sm) var(--spacing-md);min-width:90px}.hero-stat-label{font-size:.75rem;text-transform:uppercase;letter-spacing:.08em;opacity:.8}.hero-stat-value{display:block;font-size:1.4rem;font-weight:700}.hero-panel-visual{position:relative}.hero-orb{position:absolute;border-radius:50%;filter:blur(0px);opacity:.35}.orb-one{width:160px;height:160px;background:#fff9;top:-20px;right:10px}.orb-two{width:220px;height:220px;background:#ffffff59;bottom:-40px;left:-20px}.theme-body{display:grid;grid-template-columns:280px 1fr;gap:var(--spacing-2xl);align-items:flex-start}.theme-filter-panel{background:var(--panel-bg);border-radius:var(--radius-xl);border:1px solid var(--panel-border);padding:var(--spacing-xl);display:flex;flex-direction:column;gap:var(--spacing-lg);position:sticky;top:var(--spacing-xl)}.filter-label{font-size:.85rem;letter-spacing:.1em;text-transform:uppercase;color:var(--text-secondary);margin-bottom:var(--spacing-xs)}.filter-subtitle{color:var(--text-secondary);font-size:.9rem}.theme-filter-list{display:flex;flex-direction:column;gap:var(--spacing-sm)}.theme-filter-card{border:1px solid var(--panel-border);border-radius:var(--radius-lg);padding:var(--spacing-md);background:var(--bg-primary);display:flex;flex-direction:column;align-items:flex-start;gap:var(--spacing-xs);cursor:pointer;transition:all var(--transition-base)}.theme-filter-card.active,.theme-filter-card:hover{border-color:var(--primary-red);background:var(--primary-red-light);color:var(--primary-red);box-shadow:var(--shadow-sm)}.theme-filter-name{font-weight:600}.theme-filter-count{font-size:.85rem;opacity:.8}.theme-word-panel{background:var(--panel-bg);border-radius:var(--radius-xl);border:1px solid var(--panel-border);padding:var(--spacing-xl);display:flex;flex-direction:column;gap:var(--spacing-xl)}.theme-word-header{display:flex;justify-content:space-between;flex-wrap:wrap;gap:var(--spacing-xl)}.section-label{font-size:.8rem;letter-spacing:.18em;text-transform:uppercase;color:var(--text-secondary)}.section-subtitle{color:var(--text-secondary);margin-top:var(--spacing-xs)}.word-header-controls{display:flex;gap:var(--spacing-lg);align-items:flex-end;flex-wrap:wrap}.list-selector,.list-quick-create{display:flex;flex-direction:column;gap:var(--spacing-xs);min-width:180px}.word-header-controls select,.list-quick-row 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var(--panel-border);background:var(--bg-primary)}.theme-actions{display:flex;justify-content:center}@media (max-width: 1100px){.theme-body{grid-template-columns:1fr}.theme-filter-panel{position:static}}@media (max-width: 768px){.theme-hero-panel{grid-template-columns:1fr}.word-header-controls{flex-direction:column;align-items:stretch}}.review-status-section{background:var(--panel-bg);border-radius:var(--radius-xl);border:1px solid var(--panel-border);padding:var(--spacing-xl);display:flex;flex-direction:column;gap:var(--spacing-lg)}.rating-nav{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:var(--spacing-md)}.rating-chip{border:1px solid var(--border-light);border-radius:var(--radius-lg);padding:var(--spacing-sm) var(--spacing-md);display:flex;justify-content:space-between;align-items:center;background:var(--bg-secondary);font-weight:600;cursor:pointer;transition:all var(--transition-base)}.rating-chip.active{border-color:var(--primary-red);background:var(--primary-red-light);color:var(--primary-red);box-shadow:var(--shadow-sm)}.rating-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--spacing-md)}.rating-item{border:1px solid var(--panel-border);border-radius:var(--radius-lg);padding:var(--spacing-md);background:var(--bg-primary)}.rating-item-top{display:flex;justify-content:space-between;align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-xs)}.rating-hanzi{font-size:2rem;font-family:var(--font-serif)}.rating-details{display:flex;flex-direction:column;gap:2px;color:var(--text-secondary)}.rating-empty{color:var(--text-secondary)}.lists-panel{border:1px solid var(--panel-border);border-radius:var(--radius-xl);padding:var(--spacing-lg);background:var(--panel-bg);box-shadow:var(--shadow-sm);margin-bottom:var(--spacing-lg);display:flex;flex-direction:column;gap:var(--spacing-md)}.lists-panel-header{display:flex;justify-content:space-between;align-items:center;gap:var(--spacing-md)}.lists-panel-subtitle{color:var(--text-secondary);margin-top:var(--spacing-xs)}.lists-counter{min-width:48px;height:48px;border-radius:var(--radius-full);background:var(--bg-secondary);display:flex;align-items:center;justify-content:center;font-weight:700}.lists-panel-body{display:flex;gap:var(--spacing-sm);align-items:center}.lists-panel-body select{flex:1;padding:var(--spacing-sm);border-radius:var(--radius-md);border:1px solid var(--border-light);background:var(--bg-secondary)}.lists-panel-body.stacked{flex-direction:column;align-items:stretch}.review-lists-section{margin-bottom:var(--spacing-lg)}.list-picker-panel button{padding:var(--spacing-xxs) var(--spacing-md);font-size:.9rem}.list-picker-panel .btn-primary{background:var(--primary-red);color:var(--text-inverse);border-radius:var(--radius-md)}.list-picker-panel .btn-secondary{border-radius:var(--radius-md)}.settings-page{padding:var(--spacing-2xl);max-width:var(--content-max-width);margin:0 auto var(--spacing-2xl);display:flex;flex-direction:column;gap:var(--spacing-2xl)}.settings-header .page-title{font-size:2.2rem;margin-bottom:var(--spacing-xs)}.settings-hero{background:var(--panel-bg);border-radius:var(--radius-xl);border:1px solid var(--panel-border);padding:var(--spacing-xl);display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:var(--spacing-xl);box-shadow:var(--shadow-sm)}.settings-hero-card{display:flex;align-items:center;gap:var(--spacing-lg);padding:var(--spacing-lg);border-radius:var(--radius-lg);background:linear-gradient(135deg,#d8483e1f,#f0b76214)}.settings-hero-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:var(--spacing-md)}.settings-hero-stat{padding:var(--spacing-md);border-radius:var(--radius-lg);border:1px solid var(--panel-border);background:var(--bg-primary);display:flex;flex-direction:column;gap:var(--spacing-xs)}.settings-hero-stat .stat-label{text-transform:uppercase;letter-spacing:.08em;font-size:.75rem;color:var(--text-secondary)}.settings-hero-stat .stat-value{font-size:1.2rem;font-weight:600;color:var(--text-primary)}.settings-section{background:var(--panel-bg);border-radius:var(--radius-xl);border:1px solid var(--panel-border);padding:var(--spacing-xl);box-shadow:var(--shadow-sm);display:flex;flex-direction:column;gap:var(--spacing-xl)}.settings-section-header{display:flex;flex-direction:column;gap:var(--spacing-xs)}.settings-section-title{font-size:1.6rem;margin:0}.settings-section-description{margin:0;color:var(--text-secondary)}.settings-card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:var(--spacing-lg)}.settings-card{border:1px solid var(--panel-border);border-radius:var(--radius-lg);padding:var(--spacing-lg);background:var(--bg-secondary);display:flex;flex-direction:column;gap:var(--spacing-md);min-height:160px}.settings-card-wide{grid-column:span 2}.danger-card{border-color:#dc26264d;background:#dc26260d}.danger-card .settings-card-header h3{color:#dc2626}@media (max-width: 640px){.settings-card-wide{grid-column:span 1}.settings-hero{grid-template-columns:1fr}}.settings-card-header h3{margin:0 0 var(--spacing-xs);font-size:1rem;font-weight:600}.settings-card-header p{margin:0;color:var(--text-secondary);font-size:.9rem}.settings-toggle{display:flex;align-items:center;justify-content:space-between;border:none;background:var(--bg-primary);border-radius:var(--radius-full);padding:var(--spacing-sm) var(--spacing-md);cursor:pointer;font-weight:600;color:var(--text-secondary);border:1px solid transparent}.settings-toggle.on{color:var(--primary-red);border-color:#d8483e66;background:var(--primary-red-light)}.toggle-pill{width:42px;height:22px;border-radius:var(--radius-full);background:var(--bg-tertiary);position:relative;transition:background var(--transition-base)}.toggle-pill span{position:absolute;top:2px;left:2px;width:18px;height:18px;border-radius:50%;background:var(--text-primary);transition:transform var(--transition-base)}.settings-toggle.on .toggle-pill{background:var(--primary-red)}.settings-toggle.on .toggle-pill span{transform:translate(20px);background:var(--text-inverse)}.settings-theme-grid{margin-top:var(--spacing-xs)}.settings-theme-grid .theme-card{min-height:150px}.settings-section.modern{gap:var(--spacing-lg)}.user-profile-card{display:flex;align-items:center;gap:var(--spacing-md)}.user-avatar-large{width:64px;height:64px;border-radius:var(--radius-full);background:linear-gradient(135deg,var(--primary-red),var(--gold-accent));color:var(--text-inverse);display:flex;align-items:center;justify-content:center;font-size:1.8rem;font-weight:700;object-fit:cover}.profile-photo-container{position:relative;display:inline-block}.change-photo-btn{position:absolute;bottom:-4px;right:-4px;width:32px;height:32px;border-radius:var(--radius-full);background:var(--primary-red);color:#fff;border:2px solid white;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:.875rem;transition:all var(--transition-base);box-shadow:var(--shadow-sm)}.change-photo-btn:hover:not(:disabled){background:var(--primary-red-hover);transform:scale(1.1)}.change-photo-btn:disabled{opacity:.6;cursor:not-allowed}.change-photo-text{display:none}.user-name-large{font-size:1.2rem;font-weight:600;color:var(--text-primary);margin-bottom:var(--spacing-xs)}.user-email-text{font-size:.875rem;color:var(--text-tertiary);margin-bottom:var(--spacing-xs)}.user-level-text{font-size:.95rem;color:var(--text-secondary)}.theme-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:var(--spacing-lg)}.theme-card{background:var(--bg-secondary);border:2px solid var(--border-light);border-radius:var(--radius-lg);padding:var(--spacing-md);cursor:pointer;transition:all var(--transition-base);display:flex;flex-direction:column;gap:var(--spacing-sm)}.theme-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:var(--border-medium)}.theme-card.active{border-color:var(--primary-red);background:var(--primary-red-light);box-shadow:var(--shadow-md)}.theme-preview{display:flex;gap:var(--spacing-sm);height:60px}.theme-color{flex:1;border-radius:var(--radius-md);border:1px solid var(--border-light)}.theme-info{display:flex;flex-direction:column;gap:var(--spacing-xs)}.theme-name{font-weight:600;font-size:1rem;color:var(--text-primary)}.theme-active-badge{display:inline-flex;align-items:center;gap:var(--spacing-xs);font-size:.85rem;color:var(--primary-red);font-weight:600}@media (max-width: 768px){.settings-layout{grid-template-columns:1fr;gap:var(--spacing-lg)}.settings-sidebar{position:static;display:flex;overflow-x:auto;padding:var(--spacing-sm)}.settings-nav-item{white-space:nowrap}.theme-grid{grid-template-columns:1fr}}[data-theme=asian-red]{--primary-red: #D8483E;--primary-red-hover: #C53830;--primary-red-light: #FFE3E0;--jade-green: #2F9D8A;--gold-accent: #F0B762;--welcome-gradient: linear-gradient(135deg, rgba(216, 72, 62, .92), rgba(240, 183, 98, .7));--body-bg: linear-gradient(135deg, #fffdf8 0%, #fdeee1 100%);--sidebar-bg: linear-gradient(180deg, rgba(255, 244, 240, .95), rgba(254, 228, 210, .9))}[data-theme=jade-green]{--primary-red: #2F9D8A;--primary-red-hover: #258372;--primary-red-light: #E3F5F2;--jade-green: #D8483E;--gold-accent: #F4A261;--welcome-gradient: linear-gradient(135deg, rgba(47, 157, 138, .95), rgba(244, 162, 97, .75));--body-bg: linear-gradient(135deg, #f0fff5 0%, #daf5eb 100%);--sidebar-bg: linear-gradient(180deg, rgba(227, 245, 242, .95), rgba(210, 235, 226, .9))}[data-theme=royal-purple]{--primary-red: #8B5CF6;--primary-red-hover: #7C3AED;--primary-red-light: #EDE9FE;--jade-green: #EC4899;--gold-accent: #F59E0B;--welcome-gradient: linear-gradient(135deg, rgba(139, 92, 246, .95), rgba(236, 72, 153, .7));--body-bg: linear-gradient(135deg, #f7f4ff 0%, #fce7f3 100%);--sidebar-bg: linear-gradient(180deg, rgba(245, 240, 255, .95), rgba(250, 235, 248, .9))}[data-theme=ocean-blue]{--primary-red: #3B82F6;--primary-red-hover: #2563EB;--primary-red-light: #DBEAFE;--jade-green: #06B6D4;--gold-accent: #10B981;--welcome-gradient: linear-gradient(135deg, rgba(59, 130, 246, .9), rgba(14, 165, 233, .7));--body-bg: linear-gradient(135deg, #e0f2fe 0%, #d1fae5 100%);--sidebar-bg: linear-gradient(180deg, rgba(222, 239, 254, .95), rgba(209, 250, 229, .9))}[data-theme=sunset-orange]{--primary-red: #F97316;--primary-red-hover: #EA580C;--primary-red-light: #FFEDD5;--jade-green: #EF4444;--gold-accent: #FBBF24;--welcome-gradient: linear-gradient(135deg, rgba(249, 115, 22, .95), rgba(251, 191, 36, .7));--body-bg: linear-gradient(135deg, #fff7ed 0%, #fff0da 100%);--sidebar-bg: linear-gradient(180deg, rgba(255, 240, 221, .95), rgba(255, 228, 203, .9))}[data-theme=sakura-pink]{--primary-red: #EC4899;--primary-red-hover: #DB2777;--primary-red-light: #FCE7F3;--jade-green: #F472B6;--gold-accent: #FDE047;--welcome-gradient: linear-gradient(135deg, rgba(236, 72, 153, .95), rgba(253, 224, 71, .55));--body-bg: linear-gradient(135deg, #fff0f6 0%, #fdeff5 100%);--sidebar-bg: linear-gradient(180deg, rgba(255, 235, 245, .95), rgba(252, 226, 242, .9))}.handwriting-practice{max-width:600px;margin:0 auto;padding:var(--spacing-2xl)}.handwriting-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-xl)}.handwriting-title{font-size:2rem;font-weight:700;color:var(--text-primary)}.handwriting-progress{font-size:1.1rem;font-weight:600;color:var(--text-secondary);background:var(--bg-secondary);padding:var(--spacing-sm) var(--spacing-lg);border-radius:var(--radius-full)}.handwriting-character-info{display:flex;align-items:center;gap:var(--spacing-xl);background:var(--bg-primary);padding:var(--spacing-xl);border-radius:var(--radius-lg);margin-bottom:var(--spacing-xl);border:1px solid var(--border-light);box-shadow:var(--shadow-sm)}.handwriting-character-display{font-size:6rem;font-weight:700;color:var(--primary-red);font-family:var(--font-serif);line-height:1}.handwriting-character-details{flex:1}.handwriting-pinyin{font-size:1.5rem;color:var(--text-secondary);margin-bottom:var(--spacing-sm)}.handwriting-translation{font-size:1.2rem;color:var(--text-primary);font-weight:500}.handwriting-canvas-container{position:relative;background:var(--bg-primary);border:2px solid var(--border-medium);border-radius:var(--radius-lg);margin-bottom:var(--spacing-xl);overflow:hidden;box-shadow:var(--shadow-md)}.handwriting-canvas{display:block;width:100%;height:400px;cursor:crosshair;touch-action:none}.handwriting-guide{position:absolute;top:0;left:0;width:100%;height:100%;display:flex;align-items:center;justify-content:center;pointer-events:none;opacity:.08}.handwriting-guide-character{font-size:18rem;font-weight:700;color:var(--primary-red);font-family:var(--font-serif);line-height:1}.handwriting-controls{display:flex;gap:var(--spacing-lg);align-items:center}.handwriting-controls .btn-secondary{padding:var(--spacing-md) var(--spacing-xl);background:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--border-light);border-radius:var(--radius-md);font-size:1rem;font-weight:600;cursor:pointer;transition:all var(--transition-base)}.handwriting-controls .btn-secondary:hover:not(:disabled){background:var(--bg-tertiary);border-color:var(--border-medium);transform:translateY(-2px);box-shadow:var(--shadow-sm)}.handwriting-controls .btn-secondary:disabled{opacity:.4;cursor:not-allowed}.handwriting-controls .btn-primary{padding:var(--spacing-md) var(--spacing-xl);background:var(--primary-red);color:var(--text-inverse);border:none;border-radius:var(--radius-md);font-size:1rem;font-weight:600;cursor:pointer;transition:all var(--transition-base)}.handwriting-controls .btn-primary:hover{background:var(--primary-red-hover);transform:translateY(-2px);box-shadow:var(--shadow-md)}.handwriting-nav{flex:1;display:flex;gap:var(--spacing-md);justify-content:flex-end}.handwriting-empty{padding:var(--spacing-2xl);text-align:center;color:var(--text-secondary);font-size:1.2rem}@media (max-width: 768px){.handwriting-practice{padding:var(--spacing-lg)}.handwriting-character-info{flex-direction:column;text-align:center;gap:var(--spacing-md)}.handwriting-character-display{font-size:4rem}.handwriting-canvas{height:300px}.handwriting-guide-character{font-size:12rem}.handwriting-controls{flex-direction:column;gap:var(--spacing-md)}.handwriting-nav{width:100%;justify-content:space-between}}.mini-games-page{padding:0;max-width:var(--content-max-width);margin:0 auto var(--spacing-2xl);width:100%}.mini-games-header{margin-bottom:var(--spacing-2xl)}.mini-games-empty{text-align:center;padding:var(--spacing-2xl);background:var(--bg-secondary);border-radius:var(--radius-lg);margin:var(--spacing-2xl) 0}.empty-message{font-size:1.1rem;color:var(--text-secondary)}.mini-games-stats{margin-bottom:var(--spacing-2xl)}.mini-games-stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--spacing-lg);margin-top:var(--spacing-lg)}.mini-game-stat-card{display:flex;flex-direction:column;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-lg);background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm)}.mini-game-stat-icon{font-size:2.5rem}.mini-game-stat-name{font-size:.95rem;color:var(--text-secondary);text-align:center}.mini-game-stat-score{font-size:1.8rem;font-weight:700;color:var(--primary-red)}.mini-games-selection{margin-bottom:var(--spacing-2xl)}.mini-games-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--spacing-md);margin-top:var(--spacing-md)}.mini-game-card{background:var(--bg-primary);border:2px solid var(--border-light);border-radius:var(--radius-lg);padding:var(--spacing-2md);cursor:pointer;transition:all var(--transition-base);text-align:center;display:flex;flex-direction:column;gap:var(--spacing-md)}.mini-game-card:hover:not(.disabled){transform:translateY(-4px);border-color:var(--primary-red);box-shadow:var(--shadow-md)}.mini-game-card.disabled{opacity:.5;cursor:not-allowed}.mini-game-icon{font-size:4rem;margin-bottom:var(--spacing-sm)}.mini-game-name{font-size:1rem;font-weight:600;color:var(--text-primary)}.mini-game-description{font-size:1rem;color:var(--text-secondary);padding-bottom:10%}.mini-game-locked{font-size:.9rem;color:var(--primary-red);font-weight:600;margin-top:var(--spacing-sm)}.game-container{position:relative;background:var(--bg-primary);border-radius:var(--radius-lg);padding:var(--spacing-2xl);box-shadow:var(--shadow-md)}.game-back-btn{position:absolute;top:var(--spacing-lg);left:var(--spacing-lg);padding:var(--spacing-sm) var(--spacing-lg);background:var(--bg-secondary);border:1px solid var(--border-light);border-radius:var(--radius-md);color:var(--text-primary);font-weight:600;cursor:pointer;transition:all var(--transition-base)}.game-back-btn:hover{background:var(--bg-tertiary);transform:translate(-2px)}.memory-game{max-width:600px;margin:0 auto;padding-top:var(--spacing-xl)}.memory-game-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-2xl);flex-wrap:wrap;gap:var(--spacing-lg)}.memory-game-title{font-size:1.8rem;font-weight:700;color:var(--text-primary)}.memory-game-stats{display:flex;gap:var(--spacing-xl)}.memory-stat{font-size:1.1rem;color:var(--text-secondary)}.memory-stat strong{color:var(--primary-red);font-size:1.3rem}.memory-cards-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--spacing-lg);margin-bottom:var(--spacing-2xl)}.memory-card{aspect-ratio:1;background:transparent;border:none;perspective:1000px;cursor:pointer}.memory-card-inner{position:relative;width:100%;height:100%;transition:transform .6s;transform-style:preserve-3d}.memory-card.flipped .memory-card-inner{transform:rotateY(180deg)}.memory-card-front,.memory-card-back{position:absolute;width:100%;height:100%;backface-visibility:hidden;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-lg);font-size:1.5rem;font-weight:700;box-shadow:var(--shadow-sm)}.memory-card-front{background:linear-gradient(135deg,var(--primary-red),var(--gold-accent));color:var(--text-inverse);font-size:3rem}.memory-card-back{background:var(--bg-secondary);color:var(--text-primary);transform:rotateY(180deg);border:2px solid var(--border-medium)}.memory-card.matched .memory-card-back{background:var(--primary-red-light);border-color:var(--primary-red)}.hanzi-card .memory-card-back{font-family:var(--font-serif);font-size:2.5rem}.translation-card .memory-card-back{font-size:1.2rem;padding:var(--spacing-sm);text-align:center}.memory-reset-btn{display:block;margin:0 auto;padding:var(--spacing-md) var(--spacing-2xl)}.speed-quiz-start,.falling-game-start{display:flex;align-items:center;justify-content:center;min-height:400px;padding:var(--spacing-2xl)}.speed-quiz-intro,.falling-game-intro{text-align:center;max-width:100%;background:var(--bg-secondary);padding:var(--spacing-2xl);border-radius:var(--radius-lg);border:1px solid var(--border-light)}.speed-quiz-title,.falling-game-title{font-size:2rem;font-weight:700;color:var(--text-primary);margin-bottom:var(--spacing-lg)}.speed-quiz-description,.falling-game-description{font-size:1.1rem;color:var(--text-secondary);margin-bottom:var(--spacing-xl)}.speed-quiz-start-btn,.falling-game-start-btn{padding:var(--spacing-lg) var(--spacing-2xl);font-size:1.2rem}.speed-quiz-game{max-width:600px;margin:0 auto;padding-top:var(--spacing-xl)}.speed-quiz-header{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing-lg);background:var(--bg-secondary);border-radius:var(--radius-lg);margin-bottom:var(--spacing-2xl)}.speed-quiz-timer{font-size:1.5rem;font-weight:700;color:var(--primary-red)}.speed-quiz-score{font-size:1.3rem;font-weight:600;color:var(--text-primary)}.speed-quiz-question{text-align:center}.speed-quiz-character{font-size:5rem;font-weight:700;color:var(--primary-red);font-family:var(--font-serif);margin-bottom:var(--spacing-sm)}.speed-quiz-pinyin{font-size:1.5rem;color:var(--text-secondary);margin-bottom:var(--spacing-xl)}.speed-quiz-prompt{font-size:1.2rem;color:var(--text-primary);margin-bottom:var(--spacing-lg);font-weight:600}.speed-quiz-options{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--spacing-lg)}.speed-quiz-option{padding:var(--spacing-lg);background:var(--bg-secondary);border:2px solid var(--border-light);border-radius:var(--radius-md);font-size:1.1rem;font-weight:600;color:var(--text-primary);cursor:pointer;transition:all var(--transition-base)}.speed-quiz-option:hover:not(:disabled){border-color:var(--primary-red);transform:scale(1.05)}.speed-quiz-option.correct{background:#d4edda;border-color:#28a745;color:#155724}.speed-quiz-option.show-correct{background:#fff3cd;border-color:#ffc107}.falling-game{max-width:600px;margin:0 auto;padding-top:var(--spacing-xl)}.falling-game-header{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing-lg);background:var(--bg-secondary);border-radius:var(--radius-lg);margin-bottom:var(--spacing-lg)}.falling-game-target{display:flex;align-items:center;gap:var(--spacing-md)}.falling-target-label{font-size:1rem;color:var(--text-secondary);font-weight:600}.falling-target-text{font-size:1.5rem;font-weight:700;color:var(--primary-red)}.falling-game-stats{display:flex;gap:var(--spacing-lg);font-size:1.2rem;font-weight:600}.falling-stat{color:var(--text-primary)}.falling-game-area{position:relative;width:100%;height:500px;background:var(--bg-primary);border:2px solid var(--border-medium);border-radius:var(--radius-lg);overflow:hidden}.falling-character{position:absolute;padding:var(--spacing-md);background:linear-gradient(135deg,var(--primary-red),var(--gold-accent));color:var(--text-inverse);border:none;border-radius:var(--radius-md);font-size:2rem;font-weight:700;font-family:var(--font-serif);cursor:pointer;transition:transform .1s;box-shadow:var(--shadow-sm);min-width:60px;min-height:60px;display:flex;align-items:center;justify-content:center}.falling-character:hover{transform:scale(1.1)}.sentence-builder-game{max-width:720px;margin:0 auto;padding-top:var(--spacing-xl);display:flex;flex-direction:column;gap:var(--spacing-lg)}.sentence-builder-header{display:flex;justify-content:space-between;color:var(--text-secondary);font-weight:600}.sentence-builder-card{background:var(--bg-primary);border-radius:var(--radius-xl);border:1px solid var(--border-light);padding:var(--spacing-xl);box-shadow:var(--shadow-sm);display:flex;flex-direction:column;gap:var(--spacing-lg)}.sentence-builder-translation{font-size:1rem;color:var(--text-secondary);display:flex;flex-direction:column;gap:var(--spacing-xs)}.sentence-builder-translation span{font-size:1.1rem;color:var(--text-primary)}.sentence-builder-hanzi{font-size:1.6rem;font-family:var(--font-serif);color:var(--text-primary)}.sentence-builder-selected{min-height:64px;background:var(--bg-secondary);border-radius:var(--radius-lg);padding:var(--spacing-sm);display:flex;flex-wrap:wrap;gap:var(--spacing-sm);border:1px dashed var(--border-light)}.sentence-builder-placeholder{color:var(--text-secondary);font-size:.9rem}.sentence-builder-selected-token{background:var(--primary-red-light);border:none;border-radius:var(--radius-md);padding:var(--spacing-sm) var(--spacing-md);font-weight:600;cursor:pointer}.sentence-builder-options{display:flex;flex-wrap:wrap;gap:var(--spacing-sm)}.sentence-token{border-radius:var(--radius-md);border:1px solid var(--border-light);padding:var(--spacing-sm) var(--spacing-md);background:var(--bg-secondary);cursor:pointer;transition:transform var(--transition-fast),box-shadow var(--transition-fast);font-weight:600}.sentence-token:hover:not(:disabled){transform:translateY(-2px);box-shadow:var(--shadow-sm)}.sentence-token.selected,.sentence-token:disabled{opacity:.5;cursor:default}.sentence-builder-actions{display:flex;justify-content:space-between;gap:var(--spacing-md)}.sentence-builder-feedback{text-align:center;font-weight:600}.sentence-builder-feedback.success{color:var(--jade-green)}.sentence-builder-feedback.error{color:var(--primary-red)}.sentence-builder-empty,.pinyin-typing-empty{min-height:260px;display:flex;align-items:center;justify-content:center;text-align:center;background:var(--bg-secondary);border-radius:var(--radius-lg);padding:var(--spacing-lg);color:var(--text-secondary)}.pinyin-typing-game{max-width:560px;margin:0 auto;padding-top:var(--spacing-xl);display:flex;flex-direction:column;gap:var(--spacing-lg)}.pinyin-typing-header{display:flex;justify-content:space-between;color:var(--text-secondary);font-weight:600}.pinyin-typing-card{background:var(--bg-primary);border-radius:var(--radius-xl);border:1px solid var(--border-light);padding:var(--spacing-xl);box-shadow:var(--shadow-sm)}.pinyin-typing-character{font-size:3rem;text-align:center;margin-bottom:var(--spacing-md)}.pinyin-typing-translation{text-align:center;color:var(--text-secondary);display:flex;flex-direction:column;gap:var(--spacing-xxs);margin-bottom:var(--spacing-lg)}.pinyin-typing-translation span{color:var(--text-primary);font-size:1.1rem}.pinyin-typing-form{display:flex;gap:var(--spacing-sm);margin-bottom:var(--spacing-sm)}.pinyin-typing-input{flex:1;border-radius:var(--radius-lg);border:2px solid var(--border-light);padding:var(--spacing-sm) var(--spacing-md);font-size:1.1rem}.pinyin-typing-feedback{text-align:center;font-weight:600;margin-top:var(--spacing-sm)}.pinyin-typing-feedback.error{color:var(--primary-red)}.pinyin-typing-feedback.success{color:var(--jade-green)}.pinyin-typing-actions{display:flex;justify-content:space-between;gap:var(--spacing-md)}.game-results{display:flex;align-items:center;justify-content:center;min-height:400px;padding:var(--spacing-2xl)}.game-results-card{text-align:center;max-width:100%;background:var(--bg-secondary);padding:var(--spacing-2xl);border-radius:var(--radius-lg);border:2px solid var(--primary-red);box-shadow:var(--shadow-lg)}.game-results-title{font-size:2.5rem;font-weight:700;color:var(--text-primary);margin-bottom:var(--spacing-xl)}.game-results-score{display:flex;flex-direction:column;gap:var(--spacing-sm);margin-bottom:var(--spacing-xl)}.game-results-label{font-size:1.2rem;color:var(--text-secondary);font-weight:600}.game-results-value{font-size:4rem;font-weight:700;color:var(--primary-red)}.game-results-game{font-size:1.3rem;color:var(--text-secondary);margin-bottom:var(--spacing-2xl)}.game-results-actions{display:flex;gap:var(--spacing-lg);justify-content:center}.game-results-actions .btn-primary,.game-results-actions .btn-secondary{padding:var(--spacing-md) var(--spacing-xl);font-size:1.1rem}@media (max-width: 768px){.mini-games-page{padding:var(--spacing-lg)}.mini-games-grid{grid-template-columns:1fr}.memory-cards-grid{grid-template-columns:repeat(3,1fr);gap:var(--spacing-sm)}.speed-quiz-options{grid-template-columns:1fr}.falling-game-area{height:400px}.falling-character{min-width:50px;min-height:50px;font-size:1.5rem}}.learning-progress-chart-section{margin:var(--spacing-xl) 0;padding:var(--spacing-xl);background:var(--bg-primary);border-radius:var(--radius-lg);border:1px solid var(--border-light);box-shadow:var(--shadow-sm)}.learning-progress-chart-section .section-title{font-size:.75rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--text-tertiary);margin:0 0 var(--spacing-lg) 0}.chart-summary{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--spacing-lg);margin-bottom:var(--spacing-xl)}.chart-stat{display:flex;flex-direction:column;align-items:center;padding:var(--spacing-md);background:var(--bg-secondary);border-radius:var(--radius-md);border:1px solid var(--border-light)}.chart-stat-value{font-size:2.5rem;font-weight:700;color:var(--primary-red);line-height:1.2;margin-bottom:var(--spacing-xs)}.chart-stat-label{font-size:.875rem;color:var(--text-secondary);text-align:center;line-height:1.4}.chart-container{margin:var(--spacing-lg) 0;padding:var(--spacing-md);background:var(--bg-secondary);border-radius:var(--radius-md);border:1px solid var(--border-light)}.chart-description{margin-top:var(--spacing-lg);padding:var(--spacing-md);font-size:.875rem;line-height:1.6;color:var(--text-secondary);background:var(--bg-accent);border-radius:var(--radius-sm);border-left:3px solid var(--primary-red)}@media (max-width: 768px){.learning-progress-chart-section{padding:var(--spacing-lg)}.chart-summary{grid-template-columns:1fr;gap:var(--spacing-md)}.chart-stat-value{font-size:2rem}.chart-container{padding:var(--spacing-sm)}.chart-description{font-size:.8125rem}}.btn-signin{padding:var(--spacing-sm) var(--spacing-lg);background:var(--primary-red);color:#fff;border:none;border-radius:var(--radius-md);font-weight:600;cursor:pointer;transition:var(--transition-base);font-size:.9rem}.btn-signin:hover{background:var(--primary-red-hover);transform:translateY(-1px)}.user-profile{position:relative;z-index:10000}.user-profile-button{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-xs) var(--spacing-md);background:var(--bg-secondary);border:1px solid var(--border-light);border-radius:var(--radius-full);cursor:pointer;transition:var(--transition-base)}.user-profile-button:hover{background:var(--bg-tertiary);border-color:var(--border-medium)}.user-avatar{width:32px;height:32px;border-radius:50%;object-fit:cover}.user-avatar-placeholder{width:32px;height:32px;border-radius:50%;background:var(--primary-red);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1rem}.user-name{font-weight:600;color:var(--text-primary);max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.user-menu{position:absolute;top:calc(100% + var(--spacing-sm));right:0;background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-md);box-shadow:var(--shadow-md);min-width:200px;z-index:9999}.user-menu-header{padding:var(--spacing-md)}.user-menu-name{font-weight:600;color:var(--text-primary);margin-bottom:var(--spacing-xxs)}.user-menu-email{font-size:.875rem;color:var(--text-secondary)}.user-menu-divider{height:1px;background:var(--border-light);margin:0}.user-menu-item{width:100%;padding:var(--spacing-md);background:none;border:none;text-align:left;cursor:pointer;display:flex;align-items:center;gap:var(--spacing-sm);color:var(--text-primary);transition:var(--transition-fast)}.user-menu-item:hover{background:var(--bg-secondary)}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:10000;padding:var(--spacing-lg)}.modal-content{background:var(--bg-primary);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);max-width:450px;width:100%;position:relative;padding:var(--spacing-xl)}.modal-title{margin:0 0 var(--spacing-md);font-size:1.5rem;font-weight:700;color:var(--text-primary)}.modal-description{margin:0 0 var(--spacing-xl);color:var(--text-secondary);line-height:1.6}.modal-actions{display:flex;gap:var(--spacing-md);justify-content:flex-end}.modal-actions button{min-width:120px}.modal-close{position:absolute;top:var(--spacing-md);right:var(--spacing-md);background:none;border:none;font-size:2rem;line-height:1;cursor:pointer;color:var(--text-secondary);transition:var(--transition-fast);padding:0;width:32px;height:32px;display:flex;align-items:center;justify-content:center}.modal-close:hover{color:var(--text-primary)}.auth-modal{padding:var(--spacing-2xl)}.auth-title{font-size:1.75rem;font-weight:700;color:var(--text-primary);margin:0 0 var(--spacing-sm) 0;text-align:center}.auth-subtitle{color:var(--text-secondary);text-align:center;margin:0 0 var(--spacing-xl) 0;font-size:.9375rem}.auth-error{padding:var(--spacing-md);background:#dc26261a;border:1px solid rgba(220,38,38,.3);border-radius:var(--radius-md);color:#dc2626;margin-bottom:var(--spacing-lg);font-size:.875rem;text-align:center}.btn-google{width:100%;padding:var(--spacing-md) var(--spacing-lg);background:#fff;border:1px solid var(--border-medium);border-radius:var(--radius-md);font-weight:600;cursor:pointer;transition:var(--transition-base);display:flex;align-items:center;justify-content:center;gap:var(--spacing-md);font-size:.9375rem;color:var(--text-primary)}.btn-google:hover:not(:disabled){background:var(--bg-secondary);border-color:var(--primary-red)}.btn-google:disabled{opacity:.6;cursor:not-allowed}.auth-divider{display:flex;align-items:center;text-align:center;margin:var(--spacing-xl) 0;color:var(--text-tertiary);font-size:.875rem}.auth-divider:before,.auth-divider:after{content:"";flex:1;border-bottom:1px solid var(--border-light)}.auth-divider span{padding:0 var(--spacing-md)}.auth-form{display:flex;flex-direction:column;gap:var(--spacing-lg)}.form-group{display:flex;flex-direction:column;gap:var(--spacing-xs)}.form-group label{font-weight:600;font-size:.875rem;color:var(--text-secondary)}.form-group input{padding:var(--spacing-md);border:1px solid var(--border-medium);border-radius:var(--radius-md);font-size:1rem;background:var(--bg-primary);color:var(--text-primary);transition:var(--transition-base)}.form-group input:focus{outline:none;border-color:var(--primary-red);box-shadow:0 0 0 3px #d8483e1a}.form-group input:disabled{opacity:.6;cursor:not-allowed}.auth-switch{text-align:center;margin-top:var(--spacing-lg);font-size:.9375rem;color:var(--text-secondary)}.auth-switch-btn{background:none;border:none;color:var(--primary-red);font-weight:600;cursor:pointer;text-decoration:underline;padding:0}.auth-switch-btn:hover:not(:disabled){color:var(--primary-red-hover)}.auth-switch-btn:disabled{opacity:.6;cursor:not-allowed}@media (max-width: 768px){.auth-modal{padding:var(--spacing-xl)}.modal-overlay{padding:var(--spacing-md)}}.login-page-wrapper{position:fixed;top:0;left:0;right:0;bottom:0;width:100vw;height:100vh;display:flex;align-items:center;justify-content:center;background:var(--app-bg);padding:var(--spacing-xl);overflow-y:auto;z-index:9999}.login-page-content{width:100%;max-width:480px;display:flex;flex-direction:column;gap:var(--spacing-2xl);margin:auto}.login-header{text-align:center;display:flex;flex-direction:column;align-items:center;gap:var(--spacing-lg)}.login-logo{width:180px;height:180px;object-fit:contain;filter:drop-shadow(0 4px 12px rgba(216,72,62,.15))}.logo-icon-large{font-size:6rem;display:block}.login-title{font-size:2.5rem;font-weight:700;color:var(--text-primary);margin:0;background:linear-gradient(135deg,var(--primary-red),var(--gold-accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.login-subtitle{font-size:1.125rem;color:var(--text-secondary);margin:0}.login-language-switcher{display:flex;justify-content:center}.login-page-wrapper .modal-overlay{position:static;background:none;padding:0}.login-page-wrapper .modal-content{max-width:none;width:100%}.login-page-wrapper .modal-close{display:none}@media (max-width: 768px){.login-page-wrapper{padding:var(--spacing-md)}.login-logo{width:140px;height:140px}.login-title{font-size:2rem}.login-subtitle{font-size:1rem}}.grammar-quiz{display:flex;flex-direction:column;gap:2rem;padding:2rem;max-width:800px;margin:0 auto}.quiz-instruction{font-size:1.5rem;font-weight:600;text-align:center;margin-bottom:.5rem}.translation-prompt{background:var(--welcome-gradient, linear-gradient(135deg, #667eea 0%, #764ba2 100%));color:#fff;padding:1.5rem 2rem;border-radius:12px;font-size:1.25rem;text-align:center;box-shadow:0 4px 12px #00000026}.translation-prompt.large{font-size:1.5rem;padding:2rem 2.5rem}.sentence-construction-area{background:var(--primary-red-light, #f8f9fa);border:2px dashed rgba(0,0,0,.08);border-radius:12px;padding:2rem;min-height:100px;display:flex;align-items:center;justify-content:center}.selected-words-container{display:flex;flex-wrap:wrap;gap:.75rem;justify-content:center;align-items:center;width:100%}.empty-placeholder{color:#6c757d;font-style:italic;opacity:.7}.available-words-container{display:flex;flex-wrap:wrap;gap:.75rem;justify-content:center}.word-chip{padding:.75rem 1.5rem;font-size:1.25rem;border-radius:8px;border:2px solid;background:#fff;cursor:pointer;transition:all .2s;font-weight:500}.word-chip.available{border-color:var(--primary-red, #667eea);color:var(--primary-red, #667eea)}.word-chip.available:hover:not(:disabled){background:var(--primary-red, #667eea);color:#fff;transform:translateY(-2px);box-shadow:0 4px 8px #00000026}.word-chip.selected{border-color:var(--jade-green, #10b981);background:var(--jade-green, #10b981);color:#fff}.word-chip.selected:hover:not(:disabled){background:var(--jade-green, #059669);border-color:var(--jade-green, #059669)}.word-chip:disabled{opacity:.6;cursor:not-allowed}.sentence-with-blank{background:var(--primary-red-light, #f8f9fa);padding:2rem;border-radius:12px;font-size:2rem;text-align:center;font-weight:500;display:flex;align-items:center;justify-content:center;gap:.5rem}.sentence-part{color:var(--text-primary, #212529)}.blank-space{color:var(--primary-red, #667eea);font-weight:700;display:inline-block;min-width:80px;border-bottom:3px solid var(--primary-red, #667eea);padding:0 .5rem}.particle-choices{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:1rem;max-width:600px;margin:0 auto}.particle-option{padding:1.25rem 2rem;font-size:1.75rem;font-weight:600;border:3px solid #dee2e6;border-radius:12px;background:#fff;cursor:pointer;transition:all .2s}.particle-option:hover:not(:disabled){border-color:var(--primary-red, #667eea);background:var(--primary-red-light, #f0f3ff);transform:scale(1.05)}.particle-option.correct{border-color:#10b981;background:#d1fae5;color:#065f46}.particle-option.incorrect{border-color:#ef4444;background:#fee2e2;color:#991b1b}.particle-option:disabled{cursor:not-allowed}.sentence-display{background:var(--primary-red-light, #f8f9fa);padding:2rem;border-radius:12px;font-size:2rem;text-align:center;font-weight:500;color:#212529}.fill-blank-choices{display:flex;flex-wrap:wrap;gap:1rem;justify-content:center}.fill-option{padding:1rem 2rem;font-size:1.5rem;font-weight:600;border:3px solid #dee2e6;border-radius:12px;background:#fff;cursor:pointer;transition:all .2s;min-width:150px}.fill-option:hover:not(:disabled){border-color:var(--primary-red, #667eea);background:var(--primary-red-light, #f0f3ff);transform:translateY(-2px)}.fill-option.correct{border-color:#10b981;background:#d1fae5;color:#065f46}.fill-option.incorrect{border-color:#ef4444;background:#fee2e2;color:#991b1b}.fill-option:disabled{cursor:not-allowed}.translation-choices{display:flex;flex-direction:column;gap:1rem}.translation-option{padding:1.5rem 2rem;font-size:1.5rem;font-weight:500;border:3px solid #dee2e6;border-radius:12px;background:#fff;cursor:pointer;transition:all .2s;text-align:center}.translation-option:hover:not(:disabled){border-color:var(--primary-red, #667eea);background:var(--primary-red-light, #f0f3ff);transform:translate(8px)}.translation-option.correct{border-color:#10b981;background:#d1fae5;color:#065f46}.translation-option.incorrect{border-color:#ef4444;background:#fee2e2;color:#991b1b}.translation-option:disabled{cursor:not-allowed}.answer-feedback{display:flex;gap:1.5rem;padding:1.5rem;border-radius:12px;align-items:flex-start;animation:slideIn .3s ease-out}@keyframes slideIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.answer-feedback.correct{background:#d1fae5;border:2px solid #10b981}.answer-feedback.incorrect{background:#fee2e2;border:2px solid #ef4444}.feedback-icon{font-size:2rem;font-weight:700;flex-shrink:0}.answer-feedback.correct .feedback-icon{color:#10b981}.answer-feedback.incorrect .feedback-icon{color:#ef4444}.feedback-text{font-size:1rem;font-weight:600;margin-bottom:.5rem;color:#374151}.correct-sentence,.complete-sentence,.correct-answer{font-size:1.5rem;font-weight:600;color:#1f2937;margin-bottom:.5rem}.pinyin-answer{font-size:1rem;color:#6b7280;font-style:italic;margin-top:.25rem}.submit-btn{padding:1rem 3rem;font-size:1.25rem;font-weight:600;background:var(--welcome-gradient, linear-gradient(135deg, #667eea 0%, #764ba2 100%));color:#fff;border:none;border-radius:12px;cursor:pointer;transition:all .2s;align-self:center;box-shadow:0 4px 12px #00000026}.submit-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 16px #667eea66}.submit-btn:disabled{opacity:.5;cursor:not-allowed;transform:none}@media (max-width: 768px){.grammar-quiz{padding:1rem;gap:1.5rem}.quiz-instruction{font-size:1.25rem}.translation-prompt{font-size:1rem;padding:1rem 1.5rem}.translation-prompt.large{font-size:1.25rem;padding:1.5rem}.sentence-with-blank{font-size:1.5rem;padding:1.5rem;flex-wrap:wrap}.sentence-display{font-size:1.5rem;padding:1.5rem}.word-chip{padding:.5rem 1rem;font-size:1rem}.particle-option{padding:1rem 1.5rem;font-size:1.5rem}.particle-choices{grid-template-columns:repeat(2,1fr)}.translation-option{font-size:1.25rem;padding:1rem 1.5rem}.correct-sentence,.complete-sentence,.correct-answer{font-size:1.25rem}}.grammar-explanation-card{background:var(--panel-bg);border-radius:var(--radius-xl);padding:var(--lesson-card-padding);box-shadow:var(--shadow-sm);border:1px solid var(--panel-border);display:flex;flex-direction:column;gap:var(--spacing-lg);margin:var(--spacing-lg) auto 0;width:100%;max-width:var(--lesson-card-max-width)}.explanation-section{padding:var(--spacing-md);border-radius:var(--radius-lg);background:var(--bg-secondary);border:1px solid var(--panel-border)}.explanation-section.when-to-use{background:linear-gradient(135deg,var(--primary-red-light),var(--bg-secondary));border-left:4px solid var(--primary-red)}.explanation-section.how-to-use{background:linear-gradient(135deg,var(--jade-green-light),var(--bg-secondary));border-left:4px solid var(--jade-green)}.explanation-section.common-mistakes{background:linear-gradient(135deg,var(--gold-accent),rgba(255,255,255,.8));border-left:4px solid var(--gold-accent)}.explanation-section.tips{background:linear-gradient(135deg,var(--jade-green-light),rgba(255,255,255,.85));border-left:4px solid var(--jade-green)}.section-header{display:flex;align-items:center;gap:.75rem;margin-bottom:.75rem}.section-icon{font-size:1.5rem}.section-header h3{font-size:1.1rem;font-weight:600;margin:0;color:var(--text-primary)}.section-content{font-size:.95rem;line-height:1.6;color:var(--text-secondary)}.section-content p{margin:.5rem 0;white-space:pre-wrap}.section-content p:first-child{margin-top:0}.section-content p:last-child{margin-bottom:0}.mistakes-content p{font-family:Monaco,Menlo,Courier New,monospace}.tips-content{background:#ffffff80;padding:.75rem;border-radius:8px}@media (max-width: 768px){.grammar-explanation-card{padding:var(--spacing-md);gap:var(--spacing-md)}.explanation-section{padding:var(--spacing-sm)}.section-header h3{font-size:1rem}.section-content{font-size:.9rem}.section-icon{font-size:1.25rem}}.flashcard-container{position:relative;width:100%;max-width:700px;margin:0 auto;padding:0}.new-card-badge{position:absolute;top:20px;right:20px;background:var(--accent-color, #ff6b6b);color:#fff;padding:6px 16px;border-radius:16px;font-size:.9rem;font-weight:600;z-index:10;box-shadow:0 2px 8px #0003}.flashcard{position:relative;width:100%;height:450px;cursor:pointer;perspective:1000px;-webkit-user-select:none;user-select:none;margin-bottom:20px}.flashcard-inner{position:relative;width:100%;height:100%;transition:transform 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#666);margin-bottom:24px;font-weight:300}.translation-large{font-size:2rem;color:var(--text-primary, #1a1a1a);font-weight:500;margin-bottom:24px;padding:16px;background:#ffffff80;border-radius:12px}.audio-btn-card{background:var(--accent-color, #4a90e2);border:none;border-radius:50%;width:60px;height:60px;font-size:1.8rem;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;margin:16px auto;box-shadow:0 4px 12px #00000026;transition:all .2s ease}.audio-btn-card:hover{transform:scale(1.1);box-shadow:0 6px 16px #0003}.audio-btn-card:active{transform:scale(.95)}.tap-hint{margin-top:24px;font-size:.95rem;color:var(--text-tertiary, #999);font-style:italic;opacity:.7}.example-sentence{margin-top:24px;padding:16px;background:#00000008;border-radius:12px;border-left:4px solid var(--accent-color, #4a90e2)}.example-hanzi{font-size:1.2rem;margin-bottom:8px;color:var(--text-primary, #1a1a1a)}.example-translation{font-size:1rem;color:var(--text-secondary, #666);font-style:italic}.answer-buttons{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:32px;max-width:600px;margin-left:auto;margin-right:auto}.answer-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:16px 8px;border:2px solid transparent;border-radius:12px;cursor:pointer;font-size:.9rem;font-weight:600;transition:all .2s ease;min-height:80px}.answer-btn:hover{transform:translateY(-2px);box-shadow:0 6px 16px #00000026}.answer-btn:active{transform:translateY(0)}.btn-time{font-size:.8rem;font-weight:400;margin-bottom:8px;opacity:.8}.btn-label{font-size:1rem;font-weight:600}.answer-btn.again{background:#ff6b6b;color:#fff;border-color:#ff5252}.answer-btn.hard{background:#ffa726;color:#fff;border-color:#ff9800}.answer-btn.good{background:#66bb6a;color:#fff;border-color:#4caf50}.answer-btn.easy{background:#42a5f5;color:#fff;border-color:#2196f3}.dark-theme .flashcard-face{background:var(--card-bg-dark, #2a2a2a);border-color:var(--border-color-dark, #444)}.dark-theme .flashcard-front{background:linear-gradient(135deg,var(--card-bg-dark, #2a2a2a) 0%,#333 100%)}.dark-theme .flashcard-back{background:linear-gradient(135deg,#2a3f5f 0%,var(--card-bg-dark, #2a2a2a) 100%)}.dark-theme .hanzi-large,.dark-theme .hanzi-medium,.dark-theme .translation-large{color:var(--text-primary-dark, #e0e0e0)}.dark-theme .pinyin-subtitle{color:var(--text-secondary-dark, #aaa)}.dark-theme .translation-large,.dark-theme .example-sentence{background:#ffffff0d}@media (max-width: 1024px){.flashcard{height:420px}.hanzi-large{font-size:4.5rem}}@media (max-width: 768px){.flashcard-container{max-width:100%;padding:0 16px}.flashcard{height:380px}.flashcard-face{padding:32px 24px}.new-card-badge{top:16px;right:16px;padding:5px 14px;font-size:.85rem}.hanzi-large{font-size:4rem}.hanzi-medium{font-size:2.5rem}.pinyin-subtitle{font-size:1.3rem}.translation-large{font-size:1.6rem}.answer-buttons{grid-template-columns:repeat(2,1fr);gap:12px;margin-top:24px}.answer-btn{min-height:75px;padding:14px 10px}}@media (max-width: 480px){.flashcard{height:340px}.flashcard-face{padding:24px 16px}.new-card-badge{top:12px;right:12px;padding:4px 12px;font-size:.8rem}.hanzi-large{font-size:3.5rem;margin-bottom:12px}.hanzi-medium{font-size:2.2rem}.pinyin-subtitle{font-size:1.1rem;margin-bottom:20px}.translation-large{font-size:1.4rem;padding:12px}.audio-btn-card{width:52px;height:52px;font-size:1.6rem}.answer-buttons{gap:10px;margin-top:20px}.answer-btn{min-height:70px;padding:12px 8px}.btn-time{font-size:.75rem}.btn-label{font-size:.9rem}}.flashcard-page{width:100%;max-width:var(--content-max-width);margin:0 auto;padding:clamp(1.5rem,4vw,2.75rem);background:linear-gradient(165deg,#fffffffa,#ffffffd9) padding-box,var(--body-bg, #fffdf8);border-radius:32px;border:1px solid var(--panel-border, rgba(255, 255, 255, .35));box-shadow:var(--shadow-lg)}.flashcard-level-selection{width:100%}.page-title{font-size:2.5rem;font-weight:700;color:var(--text-primary, #1a1a1a);margin-bottom:12px;text-align:center}.page-subtitle{font-size:1.1rem;color:var(--text-secondary, #666);text-align:center;margin-bottom:40px}.level-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px;margin-bottom:40px}.level-card{background:#ffffffc7;border:2px solid rgba(255,255,255,.55);border-radius:22px;padding:20px;cursor:pointer;transition:all .3s ease;text-align:left;position:relative;overflow:hidden}.level-card:hover:not(.locked){transform:translateY(-6px);box-shadow:0 18px 40px #00000029;border-color:var(--primary-red)}.level-card.selected{border-color:var(--primary-red);background:linear-gradient(145deg,rgba(255,255,255,.95),var(--primary-red-light));box-shadow:0 16px 45px #0000002e}.level-card.selected:after{content:"";position:absolute;top:2px;right:2px;bottom:2px;left:2px;border-radius:18px;border:1px solid rgba(255,255,255,.35);pointer-events:none}.level-card.locked{opacity:.5;cursor:not-allowed;background:var(--card-bg-disabled, #f5f5f5)}.level-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.level-name{font-size:1.3rem;font-weight:600;color:var(--text-primary, #1a1a1a);margin:0}.lock-icon{font-size:1.5rem}.level-stats-mini{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-top:16px}.flashcard-page .stat-item{display:grid;grid-template-rows:auto auto;justify-items:center;padding:10px;background:#ffffffa6;border-radius:14px;border:1px solid rgba(0,0,0,.04)}.flashcard-page .stat-value{font-size:1.2rem;font-weight:700;color:var(--primary-red);margin-bottom:0;line-height:1.2}.flashcard-page .stat-label{font-size:.6rem;color:var(--text-secondary, #666);text-transform:uppercase;letter-spacing:.04em}.unlock-hint{margin-top:12px;font-size:.9rem;color:var(--text-secondary, #666);font-style:italic;text-align:center}.selected-level-info{background:linear-gradient(180deg,#ffffffeb,#ffffffd1);border:1px solid var(--panel-border, rgba(255, 255, 255, .4));border-radius:28px;padding:clamp(1.75rem,3vw,2.5rem);margin-top:32px;box-shadow:0 28px 80px #0000001f;display:flex;flex-direction:column;gap:20px}.selected-level-heading{display:flex;align-items:center;justify-content:space-between;gap:18px}.selected-level-eyebrow{font-size:.85rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-secondary, #666);margin-bottom:.35rem}.selected-level-info h3{font-size:2rem;font-weight:700;color:var(--text-primary, #1a1a1a);margin:0}.selected-level-progress-chip{background:linear-gradient(135deg,var(--primary-red-light),var(--primary-red));border-radius:18px;padding:.75rem 1.25rem;text-align:center;border:1px solid var(--primary-red-light);min-width:120px}.chip-value{display:block;font-size:1.5rem;font-weight:700;color:var(--text-primary, #1a1a1a)}.chip-label{font-size:.85rem;letter-spacing:.05em;text-transform:uppercase;color:var(--text-secondary, #666)}.selected-level-note{font-size:1rem;color:var(--text-secondary, #666);margin:0}.stats-highlight-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(100px,1fr));gap:18px}.flashcard-page .stat-box{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:22px 18px;background:#fffffff5;border-radius:26px;border:none;box-shadow:0 18px 35px #00000014;transition:transform .2s ease,box-shadow .2s ease;min-height:140px}.flashcard-page .stat-box:hover{transform:translateY(-4px);box-shadow:0 25px 40px #00000024}.flashcard-page .stat-box.total{background:linear-gradient(145deg,#fffffffa,#fafafab3)}.flashcard-page .stat-box.new{background:linear-gradient(145deg,var(--gold-accent),rgba(255,255,255,.95))}.flashcard-page .stat-box.learning{background:linear-gradient(145deg,var(--primary-red),var(--primary-red-light))}.flashcard-page .stat-box.mature{background:linear-gradient(145deg,var(--jade-green),rgba(255,255,255,.95))}.flashcard-page .stat-number{font-size:2rem;font-weight:700;color:var(--text-primary, #1a1a1a);margin-bottom:8px}.flashcard-page .stat-text{font-size:.9rem;color:var(--text-secondary, #666);font-weight:500;text-transform:uppercase;letter-spacing:.5px}.action-buttons{display:flex;flex-direction:column;align-items:center;gap:16px;margin-top:12px}.start-session-btn{padding:18px 56px;font-size:1.2rem;font-weight:600;border:none;border-radius:999px;cursor:pointer;transition:all .3s ease;background:linear-gradient(135deg,var(--primary-red),var(--primary-red-hover));color:#fff;box-shadow:0 16px 30px #0000002e}.start-session-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 20px 35px #0003}.start-session-btn:active:not(:disabled){transform:translateY(0)}.start-session-btn:disabled{opacity:.5;cursor:not-allowed;background:#ccc}.no-cards-message{font-size:1rem;color:var(--text-secondary, #666);text-align:center;font-style:italic}.review-summary-card{display:flex;justify-content:space-between;align-items:center;gap:18px;padding:22px 24px;border-radius:24px;background:linear-gradient(135deg,var(--primary-red-light),rgba(255,255,255,.9));border:1px solid var(--primary-red-light)}.summary-label{font-size:.95rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-secondary, #666);margin-bottom:6px}.summary-caption{font-size:1.05rem;color:var(--text-primary, #1a1a1a);margin:0}.summary-count{display:flex;flex-direction:column;align-items:center;justify-content:center;min-width:96px;background:#fffffff2;border-radius:18px;padding:12px 18px;box-shadow:0 10px 25px #00000014;border:1px solid var(--primary-red-light)}.summary-count span{font-size:2rem;font-weight:700;color:var(--jade-green, #2f9d8a);line-height:1.2}.summary-count small{text-transform:uppercase;color:var(--text-secondary, #666);font-size:.75rem;letter-spacing:.08em}.session-container{max-width:800px;margin:0 auto}.session-header{display:flex;align-items:center;gap:24px;margin-bottom:32px;padding-bottom:16px;border-bottom:2px solid var(--border-color, #e0e0e0)}.exit-btn{padding:10px 20px;font-size:1rem;font-weight:600;background:transparent;border:2px solid var(--border-color, #e0e0e0);border-radius:8px;cursor:pointer;color:var(--text-primary, #1a1a1a);transition:all .2s ease}.exit-btn:hover{background:var(--card-bg, white);border-color:var(--accent-color, #4a90e2);color:var(--accent-color, #4a90e2)}.session-progress{flex:1;display:flex;flex-direction:column;gap:8px}.progress-text{font-size:1rem;font-weight:600;color:var(--text-primary, #1a1a1a);text-align:center}.progress-bar{width:100%;height:12px;background:var(--border-color, #e0e0e0);border-radius:6px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--accent-color, #4a90e2) 0%,#5ba3f5 100%);transition:width .3s ease;border-radius:6px}.session-info{display:flex;justify-content:center;gap:32px;margin-top:24px;padding:16px;background:var(--card-bg, white);border-radius:12px;box-shadow:0 2px 8px #0000000d}.remaining-cards{display:flex;align-items:center;gap:8px}.info-label{font-size:.95rem;color:var(--text-secondary, #666);font-weight:500}.info-value{font-size:1.3rem;font-weight:700;color:var(--accent-color, #4a90e2)}.session-complete{display:flex;align-items:center;justify-content:center;min-height:60vh}.completion-card{background:var(--card-bg, white);border-radius:24px;padding:64px 48px;text-align:center;box-shadow:0 12px 40px #00000026;max-width:500px}.completion-icon{font-size:6rem;margin-bottom:24px;animation:celebrate .6s ease-in-out}@keyframes celebrate{0%{transform:scale(0) rotate(0)}50%{transform:scale(1.2) rotate(180deg)}to{transform:scale(1) rotate(360deg)}}.completion-title{font-size:2.5rem;font-weight:700;color:var(--text-primary, #1a1a1a);margin-bottom:16px}.completion-message{font-size:1.2rem;color:var(--text-secondary, #666);margin-bottom:32px}.flashcard-back-btn{padding:16px 48px;font-size:1.1rem;font-weight:600;border:none;border-radius:12px;cursor:pointer;background:var(--accent-color, #4a90e2);color:#fff;transition:all .3s ease}.flashcard-back-btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px #4a90e266}.dark-theme .page-title,.dark-theme .level-name,.dark-theme .stat-number,.dark-theme .completion-title{color:var(--text-primary-dark, #e0e0e0)}.dark-theme .page-subtitle,.dark-theme .stat-label,.dark-theme .stat-text,.dark-theme .info-label,.dark-theme .completion-message{color:var(--text-secondary-dark, #aaa)}.dark-theme .level-card{background:var(--card-bg-dark, #2a2a2a);border-color:var(--border-color-dark, #444)}.dark-theme .level-card.selected{background:#2a3f5f}.dark-theme .level-card.locked{background:#1a1a1a}.dark-theme .stat-item{background:#ffffff0d}.dark-theme .selected-level-info{background:linear-gradient(180deg,#202331f2,#181b26eb);border-color:#ffffff14}.dark-theme .selected-level-progress-chip{background:linear-gradient(135deg,#f0b76233,#d8483e33);border-color:#ffffff14}.dark-theme .stat-box{background:linear-gradient(135deg,#3c3f52e6,#252737d9);box-shadow:0 20px 35px #00000080}.dark-theme .review-summary-card{background:linear-gradient(135deg,#ec489933,#4a90e226);border-color:#ffffff14}.dark-theme .summary-count{background:#00000059;box-shadow:0 10px 25px #00000073}.dark-theme .session-header{border-color:var(--border-color-dark, #444)}.dark-theme .progress-bar{background:var(--border-color-dark, #444)}.dark-theme .session-info,.dark-theme .completion-card{background:var(--card-bg-dark, #2a2a2a)}.dark-theme .exit-btn{border-color:var(--border-color-dark, #444);color:var(--text-primary-dark, #e0e0e0)}.dark-theme .exit-btn:hover{background:#333}@media (max-width: 768px){.flashcard-page{padding:18px}.page-title{font-size:2rem}.level-grid{grid-template-columns:1fr;gap:16px}.selected-level-info{padding:20px}.selected-level-heading{flex-direction:column;align-items:flex-start}.selected-level-progress-chip{width:100%}.stats-highlight-grid{grid-template-columns:repeat(2,1fr);gap:12px}.review-summary-card{flex-direction:column;align-items:flex-start}.summary-count{width:100%;flex-direction:row;justify-content:space-between}.stat-number{font-size:2rem}.start-session-btn{width:100%;padding:14px 32px;font-size:1.1rem}.session-header{flex-direction:column;gap:16px}.exit-btn{width:100%}.completion-card{padding:48px 32px}.completion-icon{font-size:4rem}.completion-title{font-size:2rem}}@media (max-width: 480px){.page-title{font-size:1.5rem}.page-subtitle{font-size:.95rem}.level-name{font-size:1.1rem}.stats-highlight-grid{grid-template-columns:1fr}.session-info{flex-direction:column;gap:16px}}.culture-page{max-width:1200px;margin:0 auto;padding:var(--spacing-xl, 2rem);animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.culture-hero{text-align:center;padding:var(--spacing-2xl, 3rem) 0;margin-bottom:var(--spacing-xl, 2rem);background:var(--welcome-gradient, linear-gradient(135deg, rgba(216, 72, 62, .92), rgba(240, 183, 98, .7)));border-radius:var(--radius-lg, 18px);color:#fff}.hero-kicker{display:block;font-size:.875rem;font-weight:600;text-transform:uppercase;letter-spacing:.1em;opacity:.9;margin-bottom:var(--spacing-sm, .5rem)}.culture-hero h1{font-size:2.5rem;font-weight:700;margin:var(--spacing-sm, .5rem) 0;color:#fff}.hero-subtitle{font-size:1.125rem;opacity:.95;max-width:600px;margin:var(--spacing-md, 1rem) auto 0}.category-filter{display:flex;gap:var(--spacing-sm, .5rem);flex-wrap:wrap;justify-content:center;margin-bottom:var(--spacing-xl, 2rem);padding:0 var(--spacing-md, 1rem)}.category-btn{padding:var(--spacing-sm, .5rem) var(--spacing-lg, 1.5rem);border:2px solid var(--border-medium, #e0e0e0);border-radius:var(--radius-full, 999px);background:var(--bg-primary, white);color:var(--text-primary, #1F2233);font-size:.9375rem;font-weight:600;cursor:pointer;transition:all .2s ease;white-space:nowrap}.category-btn:hover{border-color:var(--primary-red, #D8483E);color:var(--primary-red, #D8483E);transform:translateY(-2px)}.category-btn.active{background:var(--primary-red, #D8483E);color:#fff;border-color:var(--primary-red, #D8483E)}.culture-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:var(--spacing-lg, 1.5rem);margin-top:var(--spacing-xl, 2rem)}.culture-topic-card{background:var(--bg-primary, white);border:1px solid var(--border-light, #f0f0f0);border-radius:var(--radius-md, 12px);padding:var(--spacing-lg, 1.5rem);cursor:pointer;transition:all .25s ease;box-shadow:0 2px 8px #0000000a}.culture-topic-card:hover{transform:translateY(-6px);box-shadow:0 8px 24px #0000001f;border-color:var(--primary-red, #D8483E)}.card-icon{font-size:3rem;margin-bottom:var(--spacing-md, 1rem);line-height:1}.card-header{display:flex;gap:var(--spacing-sm, .5rem);margin-bottom:var(--spacing-md, 1rem)}.card-category,.card-difficulty{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;padding:.25rem .5rem;border-radius:var(--radius-sm, 6px)}.card-category{background:var(--primary-red-light, #fdeee1);color:var(--primary-red, #D8483E)}.card-difficulty{background:var(--bg-secondary, #f5f5f5);color:var(--text-secondary, #5E6075)}.card-title{font-size:1.25rem;font-weight:700;margin:var(--spacing-sm, .5rem) 0;color:var(--text-primary, #1F2233);line-height:1.3}.card-intro{font-size:.9375rem;color:var(--text-secondary, #5E6075);line-height:1.6;margin:var(--spacing-md, 1rem) 0}.card-footer{display:flex;justify-content:space-between;align-items:center;margin-top:var(--spacing-lg, 1.5rem);padding-top:var(--spacing-md, 1rem);border-top:1px solid var(--border-light, #f0f0f0)}.card-read-time{font-size:.875rem;color:var(--text-secondary, #5E6075)}.card-cta{font-size:.875rem;font-weight:600;color:var(--primary-red, #D8483E)}.no-topics{text-align:center;padding:var(--spacing-2xl, 3rem);color:var(--text-secondary, #5E6075)}.culture-topic-detail{max-width:800px;margin:0 auto;animation:slideIn .3s ease}@keyframes slideIn{0%{opacity:0;transform:translate(20px)}to{opacity:1;transform:translate(0)}}.back-btn{background:var(--bg-secondary, #f5f5f5);border:none;border-radius:var(--radius-md, 12px);padding:var(--spacing-sm, .5rem) var(--spacing-lg, 1.5rem);font-size:.9375rem;font-weight:600;color:var(--text-primary, #1F2233);cursor:pointer;transition:all .2s ease;margin-bottom:var(--spacing-xl, 2rem)}.back-btn:hover{background:var(--primary-red, #D8483E);color:#fff;transform:translate(-4px)}.detail-header{margin-bottom:var(--spacing-2xl, 3rem)}.detail-title-row{display:flex;align-items:center;gap:var(--spacing-lg, 1.5rem);margin-bottom:var(--spacing-lg, 1.5rem)}.detail-icon{font-size:3.5rem;line-height:1;flex-shrink:0}.detail-title{font-size:2.25rem;font-weight:700;color:var(--text-primary, #1F2233);line-height:1.2;margin:0}.detail-meta{display:flex;gap:var(--spacing-sm, .5rem);flex-wrap:wrap}.detail-category,.detail-difficulty,.detail-read-time{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;padding:.375rem .75rem;border-radius:var(--radius-full, 999px)}.detail-category{background:var(--primary-red-light, #fdeee1);color:var(--primary-red, #D8483E)}.detail-difficulty{background:var(--bg-secondary, #f5f5f5);color:var(--text-secondary, #5E6075)}.detail-read-time{background:var(--jade-green-light, #e6f7f4);color:var(--jade-green, #2F9D8A)}.detail-introduction{font-size:1.125rem;line-height:1.8;color:var(--text-primary, #1F2233);padding:var(--spacing-lg, 1.5rem);background:var(--bg-secondary, #f5f5f5);border-left:4px solid var(--primary-red, #D8483E);border-radius:var(--radius-sm, 6px);margin-bottom:var(--spacing-2xl, 3rem)}.detail-sections,.detail-section{margin-bottom:var(--spacing-2xl, 3rem)}.detail-section h2{font-size:1.75rem;font-weight:700;color:var(--text-primary, #1F2233);margin-bottom:var(--spacing-lg, 1.5rem)}.detail-section p{font-size:1rem;line-height:1.8;color:var(--text-secondary, #5E6075);margin-bottom:var(--spacing-lg, 1.5rem)}.section-examples{display:grid;gap:var(--spacing-md, 1rem);margin-top:var(--spacing-lg, 1.5rem)}.example-item{background:var(--bg-primary, white);border:2px solid var(--border-light, #f0f0f0);border-radius:var(--radius-md, 12px);padding:var(--spacing-lg, 1.5rem);transition:all .2s ease}.example-item:hover{border-color:var(--primary-red, #D8483E);transform:translate(4px)}.example-hanzi{font-size:1.5rem;font-weight:700;color:var(--text-primary, #1F2233);margin-bottom:var(--spacing-sm, .5rem)}.example-pinyin{font-size:1rem;color:var(--primary-red, #D8483E);font-style:italic;margin-bottom:var(--spacing-sm, .5rem)}.example-translation{font-size:.9375rem;color:var(--text-secondary, #5E6075)}.detail-cultural-notes{margin-bottom:var(--spacing-2xl, 3rem)}.detail-cultural-notes h2{font-size:1.75rem;font-weight:700;color:var(--text-primary, #1F2233);margin-bottom:var(--spacing-lg, 1.5rem)}.cultural-notes-grid{display:grid;gap:var(--spacing-lg, 1.5rem)}.cultural-note-box{border-radius:var(--radius-md, 12px);padding:var(--spacing-lg, 1.5rem);border-left:4px solid}.cultural-note-box.note-tip{background:#fff8e1;border-color:#fbc02d}.cultural-note-box.note-warning{background:#fff3e0;border-color:#f57c00}.cultural-note-box.note-history{background:#e3f2fd;border-color:#1976d2}.cultural-note-box.note-fun-fact{background:#f3e5f5;border-color:#7b1fa2}.note-header{display:flex;align-items:center;gap:var(--spacing-sm, .5rem);margin-bottom:var(--spacing-md, 1rem)}.note-icon{font-size:1.5rem;line-height:1}.note-label{font-size:.875rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em}.note-content{font-size:.9375rem;line-height:1.7;color:var(--text-primary, #1F2233)}.detail-vocabulary{margin-bottom:var(--spacing-2xl, 3rem)}.detail-vocabulary h2{font-size:1.75rem;font-weight:700;color:var(--text-primary, #1F2233);margin-bottom:var(--spacing-lg, 1.5rem)}.vocabulary-grid{display:flex;flex-wrap:wrap;gap:var(--spacing-sm, .5rem);margin-bottom:var(--spacing-md, 1rem)}.vocabulary-item{background:var(--bg-primary, white);border:2px solid var(--primary-red, #D8483E);border-radius:var(--radius-md, 12px);padding:var(--spacing-sm, .5rem) var(--spacing-lg, 1.5rem);font-size:1.125rem;font-weight:600;color:var(--primary-red, #D8483E);transition:all .2s ease;cursor:pointer}.vocabulary-item:hover{background:var(--primary-red, #D8483E);color:#fff;transform:scale(1.05)}.vocabulary-hint{font-size:.875rem;color:var(--text-secondary, #5E6075);font-style:italic}.detail-quiz{margin-top:var(--spacing-2xl, 3rem)}.detail-quiz h2{font-size:1.75rem;font-weight:700;color:var(--text-primary, #1F2233);margin-bottom:var(--spacing-lg, 1.5rem)}.quiz-progress{font-size:.875rem;font-weight:600;color:var(--text-secondary, #5E6075);margin-bottom:var(--spacing-lg, 1.5rem);text-align:center}.quiz-question-card{background:var(--bg-primary, white);border:2px solid var(--border-light, #f0f0f0);border-radius:var(--radius-lg, 18px);padding:var(--spacing-2xl, 3rem);box-shadow:0 4px 12px #0000000f}.quiz-question{font-size:1.375rem;font-weight:600;color:var(--text-primary, #1F2233);line-height:1.6;margin-bottom:var(--spacing-xl, 2rem);text-align:center}.quiz-choices{display:grid;gap:var(--spacing-md, 1rem);margin-bottom:var(--spacing-lg, 1.5rem)}.quiz-choice{display:flex;align-items:center;gap:var(--spacing-md, 1rem);background:var(--bg-secondary, #f5f5f5);border:2px solid transparent;border-radius:var(--radius-md, 12px);padding:var(--spacing-lg, 1.5rem);font-size:1rem;font-weight:500;color:var(--text-primary, #1F2233);cursor:pointer;transition:all .2s ease;text-align:left}.quiz-choice:hover:not(:disabled){background:var(--bg-primary, white);border-color:var(--primary-red, #D8483E);transform:translate(4px)}.quiz-choice.correct{background:#e8f5e9;border-color:#4caf50;color:#2e7d32}.quiz-choice.incorrect{background:#ffebee;border-color:#f44336;color:#c62828}.quiz-choice.disabled{opacity:.6;cursor:not-allowed}.choice-letter{display:flex;align-items:center;justify-content:center;min-width:32px;height:32px;background:var(--bg-primary, white);border-radius:50%;font-weight:700;font-size:.875rem;flex-shrink:0}.quiz-choice.correct .choice-letter{background:#4caf50;color:#fff}.quiz-choice.incorrect .choice-letter{background:#f44336;color:#fff}.choice-text{flex:1}.choice-icon{font-size:1.25rem;font-weight:700;flex-shrink:0}.quiz-explanation{background:#fff8e1;border-left:4px solid #fbc02d;border-radius:var(--radius-md, 12px);padding:var(--spacing-lg, 1.5rem);margin-top:var(--spacing-lg, 1.5rem);text-align:left}.explanation-label{font-weight:700;color:var(--text-primary, #1F2233);margin-bottom:var(--spacing-sm, .5rem)}.quiz-explanation p:last-child{margin:0;line-height:1.6;color:var(--text-primary, #1F2233)}.quiz-next-btn{width:100%;background:var(--primary-red, #D8483E);border:none;border-radius:var(--radius-md, 12px);padding:var(--spacing-lg, 1.5rem);font-size:1rem;font-weight:700;color:#fff;cursor:pointer;transition:all .2s ease;margin-top:var(--spacing-lg, 1.5rem)}.quiz-next-btn:hover{background:var(--primary-red-dark, #B83A32);transform:translateY(-2px);box-shadow:0 4px 12px #d8483e4d}.quiz-completed{text-align:center;padding:var(--spacing-2xl, 3rem)}.quiz-score-display{background:var(--bg-primary, white);border-radius:var(--radius-lg, 18px);padding:var(--spacing-2xl, 3rem);margin-bottom:var(--spacing-xl, 2rem);box-shadow:0 4px 12px #0000000f}.score-icon{font-size:4rem;margin-bottom:var(--spacing-md, 1rem);display:block}.quiz-score-display h3{font-size:1.75rem;font-weight:700;color:var(--text-primary, #1F2233);margin-bottom:var(--spacing-md, 1rem)}.quiz-score{font-size:2.5rem;font-weight:700;color:var(--primary-red, #D8483E);margin:var(--spacing-lg, 1.5rem) 0}.score-percentage{font-size:1.5rem;color:var(--text-secondary, #5E6075);margin-left:var(--spacing-sm, .5rem)}.quiz-message{font-size:1.125rem;color:var(--text-secondary, #5E6075);line-height:1.6}.quiz-restart-btn{background:var(--bg-secondary, #f5f5f5);border:2px solid var(--border-medium, #e0e0e0);border-radius:var(--radius-md, 12px);padding:var(--spacing-lg, 1.5rem) var(--spacing-2xl, 3rem);font-size:1rem;font-weight:700;color:var(--text-primary, #1F2233);cursor:pointer;transition:all .2s ease}.quiz-restart-btn:hover{background:var(--primary-red, #D8483E);border-color:var(--primary-red, #D8483E);color:#fff;transform:translateY(-2px)}@media (max-width: 768px){.culture-page{padding:var(--spacing-md, 1rem)}.culture-hero h1{font-size:2rem}.culture-grid{grid-template-columns:1fr}.detail-title-row{flex-direction:column;align-items:flex-start;gap:var(--spacing-md, 1rem)}.detail-icon{font-size:2.5rem}.detail-title{font-size:1.75rem}.detail-section h2{font-size:1.5rem}.category-filter{justify-content:flex-start;overflow-x:auto;flex-wrap:nowrap;padding-bottom:var(--spacing-sm, .5rem)}.quiz-question-card{padding:var(--spacing-lg, 1.5rem)}.quiz-question{font-size:1.125rem}.quiz-choice{padding:var(--spacing-md, 1rem)}}.dark-theme .culture-topic-card,.dark-theme .example-item,.dark-theme .vocabulary-item{background:var(--bg-primary-dark, #1c1f2c);border-color:var(--border-dark, #2a2d3a)}.dark-theme .culture-hero{background:var(--welcome-gradient, linear-gradient(135deg, rgba(184, 58, 50, .92), rgba(142, 46, 39, .7)))}.dark-theme .category-btn{background:var(--bg-primary-dark, #1c1f2c);border-color:var(--border-dark, #2a2d3a);color:var(--text-primary-dark, #F8F9FA)}.dark-theme .category-btn.active{background:var(--primary-red, #D8483E);border-color:var(--primary-red, #D8483E);color:#fff}:root{font-family:Plus Jakarta Sans,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:var(--text-primary, #1f2233);background-color:transparent}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:var(--body-bg, #fef9f3);font-family:Plus Jakarta Sans,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;position:relative;color:var(--text-primary, #1f2233);transition:background .3s ease}body.dark-theme{background:var(--body-bg, #0b0f16);color:var(--text-primary, #f5f5f8)}button{font-family:inherit}#root{min-height:100vh;position:relative;z-index:1}