@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Noto+Sans+SC:wght@400;500;600;700&display=swap";.layout{min-height:100vh;display:flex;flex-direction:column}.header{position:fixed;top:0;left:0;right:0;z-index:100;border-bottom:1px solid rgba(255,255,255,.06)}.header-inner{height:68px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.25rem}.brand-mark{width:36px;height:36px;display:grid;place-items:center;border-radius:10px;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;font-size:1.1rem}.desktop-nav{display:flex;align-items:center;gap:8px}.nav-link{display:flex;align-items:center;gap:8px;padding:10px 16px;border-radius:var(--radius-sm);color:var(--text-muted);font-weight:500;font-size:.95rem;transition:all .2s ease}.nav-link:hover,.nav-link.active{color:var(--text);background:#ffffff0d}.header-actions{display:flex;align-items:center;gap:12px}.mini-stat{display:flex;align-items:center;gap:6px;padding:8px 12px;border-radius:20px;background:#f59e0b1f;color:var(--warning);font-weight:600;font-size:.9rem}.flame-icon{fill:currentColor}.user-chip{display:flex;align-items:center;gap:10px;padding:6px 14px 6px 6px;border-radius:24px;background:var(--surface-2);border:1px solid rgba(255,255,255,.08);transition:all .2s ease}.user-chip:hover{border-color:#6366f159}.avatar{width:28px;height:28px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent-2));display:grid;place-items:center;font-size:.8rem;font-weight:600;color:#fff}.user-name{font-size:.9rem;font-weight:500}.logout-btn{padding:10px}.mobile-toggle{display:none;background:transparent;color:var(--text);padding:8px}.mobile-nav{position:fixed;top:68px;left:0;right:0;z-index:99;padding:16px 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auto;display:flex;align-items:center;gap:16px}.install-banner-icon{width:48px;height:48px;border-radius:12px;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0}.install-banner-text{flex:1;display:flex;flex-direction:column;gap:2px}.install-banner-text strong{font-size:16px;color:var(--text)}.install-banner-text span{font-size:13px;color:var(--text-muted)}.install-banner-actions{display:flex;gap:8px;flex-shrink:0}.btn-sm{padding:8px 16px;font-size:14px}@media (max-width: 900px){.desktop-nav,.user-name{display:none}.mobile-toggle{display:block}.install-label{display:none}.btn-install{padding:8px 10px}}@media (max-width: 480px){.header-actions .btn-ghost:not(.logout-btn){display:none}.install-banner-content{flex-wrap:wrap}}.home{overflow:hidden}.hero{position:relative;min-height:calc(100svh - 68px);display:flex;align-items:center;padding:80px 0;background:radial-gradient(ellipse at 70% 30%,rgba(99,102,241,.12),transparent 55%),radial-gradient(ellipse at 30% 80%,rgba(139,92,246,.1),transparent 50%)}.hero-glow{position:absolute;inset:0;background:radial-gradient(circle at 50% 50%,rgba(99,102,241,.06),transparent 70%);pointer-events:none}.hero-content{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;border-radius:20px;background:#6366f11f;color:var(--accent);font-size:.85rem;font-weight:600;margin-bottom:24px}.hero-text h1{font-size:clamp(2.6rem,6vw,4.4rem);font-weight:800;line-height:1.08;letter-spacing:-.04em;margin-bottom:24px}.hero-text p{color:var(--text-muted);font-size:1.15rem;max-width:520px;margin-bottom:32px}.hero-actions{display:flex;gap:16px;flex-wrap:wrap}.hero-visual{display:flex;justify-content:center}.hero-card{width:100%;max-width:420px;background:var(--surface);border:1px solid rgba(255,255,255,.08);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}.hero-card-header{display:flex;align-items:center;gap:10px;color:var(--text-muted);font-size:.9rem;margin-bottom:24px}.pulse-dot{width:10px;height:10px;border-radius:50%;background:var(--success);box-shadow:0 0 #22c55eb3;animation:pulse 2s infinite}@keyframes pulse{0%{box-shadow:0 0 #22c55eb3}70%{box-shadow:0 0 0 10px #22c55e00}to{box-shadow:0 0 #22c55e00}}.mini-lesson{display:flex;align-items:center;gap:14px;padding:18px;border-radius:var(--radius-sm);background:var(--surface-2);margin-bottom:20px}.mini-lesson-title{font-weight:600;margin-bottom:4px}.mini-lesson-meta{color:var(--text-muted);font-size:.85rem}.progress-line{height:8px;background:var(--surface-2);border-radius:4px;overflow:hidden;margin-bottom:24px}.progress-fill{height:100%;border-radius:4px;background:linear-gradient(90deg,var(--accent),var(--accent-2))}.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;text-align:center}.hero-stat-value{font-size:1.4rem;font-weight:700;background:linear-gradient(135deg,var(--accent),var(--accent-2));-webkit-background-clip:text;-webkit-text-fill-color:transparent}.hero-stat-label{color:var(--text-muted);font-size:.75rem;margin-top:4px}.features{padding:100px 0}.section-header{text-align:center;margin-bottom:56px}.section-header .section-subtitle{margin:0 auto}.feature-card{background:var(--surface);border:1px solid rgba(255,255,255,.06);border-radius:var(--radius);padding:28px}.feature-icon{width:48px;height:48px;border-radius:12px;background:#6366f11f;color:var(--accent);display:grid;place-items:center;margin-bottom:18px}.feature-card h3{font-size:1.15rem;font-weight:600;margin-bottom:8px}.feature-card p{color:var(--text-muted);font-size:.95rem}.path{padding:100px 0;background:linear-gradient(180deg,transparent,rgba(99,102,241,.04),transparent)}.path-inner{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}.path-text .section-subtitle{margin-bottom:28px}.path-list{list-style:none;display:flex;flex-direction:column;gap:14px;margin-bottom:32px}.path-list li{display:flex;align-items:center;gap:12px;color:var(--text-muted)}.path-list li svg{color:var(--accent)}.path-visual{display:flex;align-items:center;justify-content:center;gap:8px;padding:40px 20px;background:var(--surface);border:1px solid rgba(255,255,255,.06);border-radius:var(--radius)}.path-node{width:64px;height:64px;border-radius:50%;display:grid;place-items:center;background:var(--surface-2);color:var(--text-muted);font-size:.85rem;font-weight:600;border:2px solid rgba(255,255,255,.06)}.path-node.active{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;border-color:transparent;box-shadow:0 8px 24px var(--accent-glow)}.path-line{flex:1;height:3px;background:linear-gradient(90deg,var(--accent),var(--accent-2));border-radius:2px}.path-line.dashed{background:repeating-linear-gradient(90deg,var(--surface-3),var(--surface-3) 6px,transparent 6px,transparent 12px)}.cta{padding:80px 0 120px}.cta-card{text-align:center;padding:72px 40px;border-radius:var(--radius);background:linear-gradient(135deg,#6366f11f,#8b5cf614);border:1px solid rgba(99,102,241,.18)}.cta-card h2{font-size:2.2rem;font-weight:700;margin-bottom:12px}.cta-card p{color:var(--text-muted);margin-bottom:28px;font-size:1.05rem}@media (max-width: 900px){.hero-content,.path-inner{grid-template-columns:1fr}.hero-visual{order:-1}.path-visual{flex-wrap:wrap;gap:12px}.path-line{display:none}}@media (max-width: 480px){.hero-stats{grid-template-columns:repeat(2,1fr)}.cta-card{padding:48px 24px}}.auth-page{min-height:100vh;display:grid;place-items:center;padding:100px 24px 60px;background:radial-gradient(ellipse at 50% 0%,rgba(99,102,241,.1),transparent 50%)}.auth-card{width:100%;max-width:440px;background:var(--surface);border:1px solid rgba(255,255,255,.08);border-radius:var(--radius);padding:40px;box-shadow:var(--shadow)}.auth-header{text-align:center;margin-bottom:32px}.auth-header h1{font-size:1.9rem;font-weight:700;margin-bottom:8px}.auth-header p{color:var(--text-muted)}.auth-form{display:flex;flex-direction:column;gap:18px}.field label{display:block;font-size:.9rem;font-weight:500;margin-bottom:8px;color:var(--text-muted)}.input-wrap{display:flex;align-items:center;gap:12px;padding:0 16px;background:var(--surface-2);border:1px solid rgba(255,255,255,.06);border-radius:var(--radius-sm);transition:all .2s ease}.input-wrap:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}.input-wrap svg{color:var(--text-muted);flex-shrink:0}.input-wrap input,.input-wrap select{flex:1;padding:14px 0;background:transparent;border:none;color:var(--text);font-size:.95rem}.input-wrap input::placeholder{color:var(--text-muted);opacity:.6}.auth-error{padding:12px;border-radius:var(--radius-sm);background:#ef44441a;color:var(--danger);font-size:.9rem;text-align:center}.submit-btn{width:100%;margin-top:8px}.auth-footer{text-align:center;margin-top:24px;color:var(--text-muted);font-size:.95rem}.auth-footer a{color:var(--accent);font-weight:600}.demo-tip{margin-top:16px;padding:12px;border-radius:var(--radius-sm);background:#6366f114;color:var(--text-muted);font-size:.85rem;text-align:center}@media (max-width: 480px){.auth-card{padding:28px 24px}}.courses{background:radial-gradient(ellipse at 20% 10%,rgba(99,102,241,.06),transparent 40%)}.my-grade-banner{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:24px;border-radius:var(--radius);background:linear-gradient(135deg,#6366f12e,#8b5cf61a);border:1px solid rgba(99,102,241,.2);margin-bottom:40px}.my-grade-label{color:var(--text-muted);font-size:.9rem;margin-bottom:4px}.my-grade-name{font-size:1.4rem;font-weight:700}.grades-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px}.grade-card{position:relative;display:flex;align-items:flex-start;gap:18px;padding:24px;border-radius:var(--radius);background:var(--surface);border:1px solid rgba(255,255,255,.06);overflow:hidden}.grade-card.current{border-color:#6366f166;box-shadow:0 0 0 1px #6366f11a}.grade-card.locked{opacity:.55;cursor:not-allowed}.grade-color{width:12px;height:100%;min-height:80px;border-radius:6px;flex-shrink:0}.grade-info h3{font-size:1.15rem;font-weight:600;margin-bottom:6px}.grade-info p{color:var(--text-muted);font-size:.9rem;margin-bottom:12px;line-height:1.5}.grade-meta{display:flex;align-items:center;gap:8px;color:var(--text-muted);font-size:.85rem}.lock-icon{position:absolute;top:20px;right:20px;color:var(--text-muted)}.current-badge{position:absolute;top:20px;right:20px;padding:4px 10px;border-radius:12px;background:#6366f126;color:var(--accent);font-size:.75rem;font-weight:600}@media (max-width: 480px){.my-grade-banner{flex-direction:column;align-items:flex-start}}.grade-detail{background:radial-gradient(ellipse at 80% 0%,rgba(99,102,241,.06),transparent 40%)}.back-link{display:inline-flex;align-items:center;gap:8px;color:var(--text-muted);margin-bottom:24px;transition:color .2s ease}.back-link:hover{color:var(--text)}.page-header{padding-left:24px;border-left:4px solid var(--accent)}.units-list{display:flex;flex-direction:column;gap:32px}.unit-card{background:var(--surface);border:1px solid rgba(255,255,255,.06);border-radius:var(--radius);padding:28px}.unit-header{display:flex;align-items:center;gap:18px;margin-bottom:24px}.unit-number{width:48px;height:48px;border-radius:14px;display:grid;place-items:center;color:#fff;font-weight:700;font-size:1.2rem;flex-shrink:0}.unit-title{font-size:1.25rem;font-weight:600}.unit-desc{color:var(--text-muted);font-size:.95rem}.lessons-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}.lesson-card{display:flex;align-items:center;gap:14px;padding:18px;border-radius:var(--radius-sm);background:var(--surface-2);border:1px solid rgba(255,255,255,.05)}.lesson-card.completed{border-color:#22c55e4d}.lesson-icon{width:40px;height:40px;border-radius:10px;background:#6366f11f;color:var(--accent);display:grid;place-items:center;flex-shrink:0}.lesson-info{flex:1;min-width:0}.lesson-title{font-weight:600;margin-bottom:4px}.lesson-meta{color:var(--text-muted);font-size:.8rem}.completed-icon{color:var(--success);flex-shrink:0}@media (max-width: 480px){.lessons-grid{grid-template-columns:1fr}}.lesson-page{background:radial-gradient(ellipse at 50% 0%,rgba(99,102,241,.06),transparent 50%)}.lesson-container{max-width:820px}.lesson-header{margin-bottom:32px}.lesson-breadcrumb{color:var(--text-muted);font-size:.9rem;margin-bottom:8px}.lesson-header h1{font-size:2rem;font-weight:700;margin-bottom:6px}.lesson-header p{color:var(--text-muted)}.lesson-stage{background:var(--surface);border:1px solid rgba(255,255,255,.06);border-radius:var(--radius);padding:32px;min-height:420px}.lesson-progress{height:8px;background:var(--surface-2);border-radius:4px;overflow:hidden;margin-bottom:28px}.lesson-progress-fill{height:100%;background:linear-gradient(90deg,var(--accent),var(--accent-2));border-radius:4px;transition:width .3s ease}.lesson-card-inner{text-align:center;padding:20px 0}.lesson-card-inner h2{font-size:1.6rem;font-weight:700;margin-bottom:8px}.lesson-card-inner .phonetic{color:var(--text-muted);font-size:1.1rem;margin-bottom:16px}.lesson-card-inner .meaning{color:var(--accent);font-size:1.25rem;font-weight:600;margin-bottom:24px}.lesson-card-inner .example{color:var(--text-muted);font-size:1rem;margin-bottom:8px}.lesson-card-inner .translation{color:var(--text-muted);font-size:.95rem;margin-bottom:32px}.lesson-actions{display:flex;justify-content:center;gap:16px;flex-wrap:wrap}.option-grid{display:grid;grid-template-columns:1fr;gap:12px;margin:24px 0}.option-btn{display:flex;align-items:center;gap:12px;padding:16px;border-radius:var(--radius-sm);background:var(--surface-2);border:1px solid rgba(255,255,255,.06);color:var(--text);font-size:1rem;text-align:left;transition:all .2s ease}.option-btn:hover{border-color:#6366f166;background:var(--surface-3)}.option-btn.correct{border-color:var(--success);background:#22c55e1a}.option-btn.wrong{border-color:var(--danger);background:#ef44441a}.option-index{width:28px;height:28px;border-radius:50%;background:var(--surface-3);display:grid;place-items:center;font-size:.85rem;font-weight:600;flex-shrink:0}.speak-display{font-size:1.5rem;font-weight:600;margin-bottom:8px}.speak-phonetic{color:var(--text-muted);margin-bottom:24px}.speak-meaning{color:var(--text-muted);margin-bottom:32px}.mic-btn{width:80px;height:80px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;display:grid;place-items:center;margin:0 auto 16px;box-shadow:0 12px 32px var(--accent-glow);transition:transform .2s ease}.mic-btn:hover{transform:scale(1.05)}.mic-btn.listening{animation:mic-pulse 1.2s infinite}@keyframes mic-pulse{0%,to{box-shadow:0 0 0 0 var(--accent-glow)}50%{box-shadow:0 0 0 16px #6366f100}}.feedback{padding:16px;border-radius:var(--radius-sm);margin:20px 0;text-align:center}.feedback.success{background:#22c55e1a;color:var(--success)}.feedback.error{background:#ef44441a;color:var(--danger)}.result-card{text-align:center;padding:40px 20px}.result-score{font-size:3.5rem;font-weight:800;background:linear-gradient(135deg,var(--accent),var(--accent-2));-webkit-background-clip:text;-webkit-text-fill-color:transparent}.result-label{color:var(--text-muted);margin-bottom:24px}.result-xp{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;border-radius:20px;background:#f59e0b1f;color:var(--warning);font-weight:600;margin-bottom:32px}@media (max-width: 480px){.lesson-stage{padding:24px 20px}.lesson-header h1{font-size:1.6rem}}.mode-intro{text-align:center;padding:30px 20px}.mode-intro-icon{width:88px;height:88px;margin:0 auto 20px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;display:grid;place-items:center;box-shadow:0 12px 32px var(--accent-glow)}.mode-intro h2{font-size:1.8rem;font-weight:700;margin-bottom:8px}.mode-intro-desc{color:var(--text-muted);margin-bottom:28px}.mode-steps{text-align:left;max-width:420px;margin:0 auto 32px;display:flex;flex-direction:column;gap:12px}.mode-step{display:flex;align-items:center;gap:14px;padding:14px 16px;background:var(--surface-2);border-radius:var(--radius-sm);font-size:.95rem}.step-num{width:28px;height:28px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;display:grid;place-items:center;font-size:.85rem;font-weight:700;flex-shrink:0}.mode-badge{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;border-radius:20px;background:#6366f11f;color:var(--accent);font-size:.85rem;font-weight:600;margin-bottom:16px}.mode-badge.review-badge{background:#f59e0b1f;color:var(--warning)}.word-card{background:var(--surface-2);border:1px solid rgba(255,255,255,.06);border-radius:var(--radius);padding:32px 24px;margin-bottom:24px}.word-text{font-size:2.4rem;font-weight:700;margin-bottom:12px;letter-spacing:-.02em}.phonetic-btn{background:transparent;border:none;color:var(--text-muted);font-size:1rem;cursor:pointer;display:inline-flex;align-items:center;gap:6px;padding:4px 8px;border-radius:6px;transition:background .2s;margin-bottom:12px}.phonetic-btn:hover{background:var(--surface-3)}.pos-badge{display:inline-block;padding:2px 10px;border-radius:4px;background:#8b5cf626;color:var(--accent-2);font-size:.85rem;font-style:italic;margin-bottom:20px}.reveal-btn{margin:0 auto 20px}.meaning-block .meaning{font-size:1.3rem;font-weight:600;color:var(--accent);margin-bottom:16px}.example-block{padding:14px 16px;background:var(--surface-3);border-radius:var(--radius-sm);margin-top:16px;text-align:left}.example-block .example{color:var(--text);margin-bottom:6px;font-size:1rem}.example-block .translation{color:var(--text-muted);font-size:.9rem}.word-relations{display:flex;flex-wrap:wrap;align-items:center;gap:6px;margin-top:12px;font-size:.85rem}.relation-label{color:var(--text-muted)}.relation-tag{padding:2px 8px;background:var(--surface-3);border-radius:4px;color:var(--text);font-size:.8rem}.prompt-text{color:var(--text-muted);font-size:.95rem;margin-bottom:12px}.word-prompt{font-size:2rem;font-weight:700;margin-bottom:6px;display:flex;align-items:center;justify-content:center;gap:12px}.phonetic-btn-inline{background:var(--surface-2);border:none;color:var(--text-muted);width:36px;height:36px;border-radius:50%;cursor:pointer;display:grid;place-items:center;transition:background .2s}.phonetic-btn-inline:hover{background:var(--surface-3);color:var(--accent)}.phonetic-hint{color:var(--text-muted);font-size:1rem;margin-bottom:24px}.pos-hint{color:var(--accent-2);font-style:italic;font-size:.9rem;margin-bottom:20px}.meaning-prompt{font-size:1.8rem;font-weight:600;margin-bottom:8px;color:var(--accent)}.spell-input{width:100%;max-width:320px;padding:14px 18px;font-size:1.2rem;text-align:center;background:var(--surface-2);border:2px solid rgba(255,255,255,.1);border-radius:var(--radius-sm);color:var(--text);outline:none;transition:border-color .2s;margin:0 auto 16px;display:block}.spell-input:focus{border-color:var(--accent)}.spell-input.correct{border-color:var(--success);background:#22c55e14}.spell-input.wrong{border-color:var(--danger);background:#ef444414}.spell-reveal{margin-top:12px;color:var(--text);font-size:1rem}.spell-reveal 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