@font-face{font-family:Be Vietnam Pro;font-style:normal;font-display:swap;font-weight:400;src:url(/assets/be-vietnam-pro-latin-400-normal-PpnXBOrz.woff2) format("woff2"),url(/assets/be-vietnam-pro-latin-400-normal-bXgqVju9.woff) format("woff")}@font-face{font-family:Be Vietnam Pro;font-style:normal;font-display:swap;font-weight:500;src:url(/assets/be-vietnam-pro-latin-500-normal-B6LVzGNe.woff2) format("woff2"),url(/assets/be-vietnam-pro-latin-500-normal-BJkVuMHw.woff) format("woff")}@font-face{font-family:Be Vietnam Pro;font-style:normal;font-display:swap;font-weight:600;src:url(/assets/be-vietnam-pro-latin-600-normal-BZDkUTrt.woff2) format("woff2"),url(/assets/be-vietnam-pro-latin-600-normal-5IO4e7bK.woff) format("woff")}@font-face{font-family:Be Vietnam Pro;font-style:normal;font-display:swap;font-weight:700;src:url(/assets/be-vietnam-pro-latin-700-normal-DlW1Zbsh.woff2) format("woff2"),url(/assets/be-vietnam-pro-latin-700-normal-C2EtzaOi.woff) format("woff")}@font-face{font-family:Be Vietnam Pro;font-style:normal;font-display:swap;font-weight:400;src:url(/assets/be-vietnam-pro-vietnamese-400-normal-CRcqvyg1.woff2) format("woff2"),url(/assets/be-vietnam-pro-vietnamese-400-normal-BuGn0gnm.woff) format("woff")}@font-face{font-family:Be Vietnam Pro;font-style:normal;font-display:swap;font-weight:500;src:url(/assets/be-vietnam-pro-vietnamese-500-normal-DREgrEoJ.woff2) format("woff2"),url(/assets/be-vietnam-pro-vietnamese-500-normal-CfdwVo8-.woff) format("woff")}@font-face{font-family:Be Vietnam Pro;font-style:normal;font-display:swap;font-weight:600;src:url(/assets/be-vietnam-pro-vietnamese-600-normal-nyU-ZL2p.woff2) format("woff2"),url(/assets/be-vietnam-pro-vietnamese-600-normal-DkpCIyan.woff) format("woff")}@font-face{font-family:Be Vietnam Pro;font-style:normal;font-display:swap;font-weight:700;src:url(/assets/be-vietnam-pro-vietnamese-700-normal-Csr0PCuG.woff2) format("woff2"),url(/assets/be-vietnam-pro-vietnamese-700-normal-By_5yT39.woff) format("woff")}:root{--accent: #1a73e8;--accent-hover: #1557b0;--accent-soft: #e8f0fe;--brand: #2f5d8a;--text: #1e293b;--muted: #5b6778;--border: #e2e8f0;--bg: #fbfaf7;--card: #ffffff;--viewer-bg: #f1f3f4;--danger: #dc2626;--danger-bg: #fef2f2;--shadow: none;--radius: 10px;--radius-sm: 6px;--radius-pill: 999px}*{box-sizing:border-box}body{margin:0;font-family:Be Vietnam Pro,-apple-system,Segoe UI,Roboto,Arial,sans-serif;color:var(--text);background:var(--bg);font-size:14px}button{font-family:inherit}.navbar{display:flex;align-items:center;gap:16px;padding:14px 32px;background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}.navbar .brand{display:flex;align-items:center;gap:10px;font-size:19px;font-weight:600;color:var(--text);text-decoration:none}.brand-logo{width:40px;height:40px;object-fit:contain}.navbar .badge,.card-title .badge{margin-left:8px;font-size:11px;font-weight:500;color:var(--accent);background:var(--accent-soft);padding:2px 8px;border-radius:var(--radius);vertical-align:middle}.navbar nav{display:flex;align-items:center;gap:8px;margin-left:auto}.navbar nav a,.navbar nav button{padding:7px 12px;border:none;border-radius:var(--radius-sm);background:none;color:var(--muted);text-decoration:none;font-size:14px;font-weight:500;white-space:nowrap;cursor:pointer}@media (max-width: 620px){.navbar nav{flex-wrap:wrap;gap:2px}.navbar nav a,.navbar nav button{padding:7px 8px}}.navbar nav a:hover,.navbar nav button:hover{color:var(--accent);background:var(--accent-soft)}.navbar nav a.active{color:var(--accent);background:var(--accent-soft)}.page{max-width:1280px;margin:0 auto;padding:24px 32px 56px}.translate-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:20px;align-items:stretch}@media (max-width: 900px){.translate-grid{grid-template-columns:minmax(0,1fr)}.navbar{flex-wrap:wrap;padding:12px 16px}.page{padding:16px 16px 40px}}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}.card-title{font-size:15px;font-weight:600;margin:0 0 16px}.lang-row{display:flex;align-items:flex-end;gap:12px;margin-bottom:16px}.lang-field{flex:1;min-width:0}.lang-field label{display:block;font-size:12px;color:var(--muted);margin-bottom:6px}.lang-field .static-value,.lang-field select{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius);font-size:14px;background:var(--card);color:var(--text)}.lang-field select{cursor:pointer}.lang-field-wide{flex:1 1 100%}.lang-hint{display:block;margin-top:4px;color:var(--muted);font-size:12px;line-height:1.4}.lang-field .static-value{color:var(--muted)}.input-tabs{display:flex;gap:6px;margin-bottom:12px}.input-tabs .tab{padding:8px 16px;border:none;border-radius:var(--radius);background:none;color:var(--muted);font-size:14px;font-weight:500;cursor:pointer}.input-tabs .tab:hover{color:var(--accent)}.input-tabs .tab.active{background:var(--accent-soft);color:var(--accent)}.translate-col{display:flex;flex-direction:column;gap:10px;min-width:0;height:100%}.translate-col>.card{flex:1}.col-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:40px;padding:0 4px}.col-toolbar .static-value{font-size:15px;font-weight:500;color:var(--text);padding:8px 12px}.toolbar-dialect{display:flex;align-items:center;gap:4px;font-size:14px;color:var(--muted)}.toolbar-dialect select{border:none;background:none;font:inherit;font-weight:500;color:var(--text);padding:8px 6px;border-radius:var(--radius-sm);cursor:pointer}.toolbar-dialect select:hover,.toolbar-dialect select:focus-visible{background:var(--accent-soft);outline:none}.col-toolbar{flex-wrap:wrap}.toolbar-dialect,.col-toolbar .btn-ghost{white-space:nowrap}.col-toolbar .btn-ghost{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;font-size:13px;color:var(--text)}.input-card{display:flex;flex-direction:column}.icon-btn{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border:none;border-radius:50%;background:none;color:var(--muted);cursor:pointer}.icon-btn:hover{background:var(--accent-soft);color:var(--accent)}.icon-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.icon-btn.listening{background:var(--danger);color:#fff;animation:voice-pulse 1.2s ease-in-out infinite}@keyframes voice-pulse{50%{box-shadow:0 0 0 8px #dc26262e}}@media (prefers-reduced-motion: reduce){.icon-btn.listening{animation:none}}.voice-error{margin:0 0 6px;font-size:13px;color:var(--danger)}.input-area{flex:1;width:100%;min-height:240px;padding:2px;border:none;border-radius:0;font-family:inherit;font-size:15px;resize:vertical;outline:none;color:var(--text)}.input-card:focus-within{border-color:var(--accent)}.input-area::placeholder{color:#94a3b8}.input-footer{display:flex;align-items:flex-end;justify-content:space-between;margin-top:12px}.input-actions{display:flex;flex-direction:column;align-items:flex-end;gap:6px}.char-count{font-size:12px;color:var(--muted)}.input-buttons{display:flex;gap:10px;align-items:center}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 18px;border-radius:var(--radius);border:1px solid var(--border);background:var(--card);color:var(--muted);cursor:pointer;font-size:14px;font-weight:500}.btn:hover{color:var(--text)}.btn-primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover);color:#fff}.btn-ghost{padding:6px 12px;font-size:12px;border-radius:var(--radius-sm)}.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}.btn-exit{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}.btn:disabled{opacity:.5;cursor:not-allowed}.quick-words{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}.quick-words button{background:#f8f9fa}.quick-words button{padding:5px 14px;border:1px solid var(--border);border-radius:var(--radius);background:var(--card);color:var(--muted);font-size:13px;cursor:pointer}.quick-words button:hover{border-color:var(--accent);color:var(--accent)}.viewer-card{background:var(--viewer-bg);box-shadow:none;display:flex;flex-direction:column}.translate-col .viewer-stage{height:380px}.viewer-placeholder{display:flex;flex-direction:column;align-items:center;gap:14px}.viewer-placeholder-icon{color:#9aa0a6}.viewer-card:fullscreen{display:flex;flex-direction:column;border:none;border-radius:0;padding:16px 24px}.viewer-card:fullscreen .viewer-stage{flex:1;height:auto}.viewer-header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px}.viewer-header-actions{display:flex;gap:8px}.viewer-stage{position:relative;background:var(--viewer-bg);border-radius:var(--radius);height:440px;display:flex;align-items:center;justify-content:center;overflow:hidden}.sign-video{max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain;display:block;background:#000;border-radius:var(--radius-sm)}.viewer-stage canvas{display:block;cursor:grab}.viewer-stage canvas:active{cursor:grabbing}.viewer-placeholder{color:var(--muted);font-size:13px}.viewer-panel{position:absolute;top:10px;right:10px;display:flex;flex-direction:column;gap:6px;padding:6px;border:1px solid var(--border);border-radius:var(--radius);background:#fff;z-index:1}.viewer-panel-row,.viewer-panel-views{display:flex;gap:4px}.viewer-panel button{height:26px;display:flex;align-items:center;justify-content:center;border:1px solid var(--border);border-radius:var(--radius-sm);background:transparent;color:var(--text);line-height:1;cursor:pointer}.viewer-panel-row button{width:26px;font-size:14px}.viewer-panel-views button{padding:0 7px;font-size:11px;color:var(--muted)}.viewer-panel button:hover{border-color:var(--accent);color:var(--accent)}.viewer-hint{position:absolute;bottom:8px;left:10px;color:var(--muted);font-size:11px;pointer-events:none}.player-controls{display:flex;align-items:center;flex-wrap:wrap;gap:12px;margin-top:16px;padding:12px 14px;border:1px solid var(--border);border-radius:var(--radius);background:var(--card);font-size:13px;color:var(--muted)}.player-controls button{min-width:34px;height:34px;padding:0 12px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--card);color:var(--text);cursor:pointer}.player-controls button:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}.player-controls .play-btn{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:500}.player-controls .play-btn:hover:not(:disabled){background:var(--accent-hover);border-color:var(--accent-hover);color:#fff}.player-controls button:disabled{opacity:.4;cursor:not-allowed}.player-controls .speed-value{min-width:52px;padding:4px 8px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--viewer-bg);color:var(--text);font-variant-numeric:tabular-nums;text-align:center}.player-controls .progress{flex:1;min-width:100px;accent-color:var(--accent)}.player-controls .counter{min-width:46px;text-align:right}.word-status-bar{margin-top:12px;padding:10px 14px;background:var(--accent-soft);border-radius:var(--radius);font-size:13px}.word-status-bar .note{color:var(--muted);margin-left:6px}.gloss-line{margin-top:12px;padding:8px 14px;border:1px dashed var(--accent);border-radius:var(--radius-sm);font-family:ui-monospace,Consolas,monospace}.gloss-line .gloss-label{color:var(--muted)}.gloss-line .gloss-active{color:var(--accent);font-weight:700;text-decoration:underline}.word-status-bar .dialect-fallback{display:inline-block;margin-left:8px;padding:1px 8px;border-radius:999px;background:#fff4d6;color:#7a5200;border:1px solid #f0c674;font-size:12px;font-weight:600}.word-status-bar .letters{margin-top:6px;letter-spacing:3px}.word-status-bar .letters span{display:inline-block;padding:1px 3px;border-radius:var(--radius-sm)}.word-status-bar .letters .letter-active{background:var(--accent);color:#fff;font-weight:700}.shortcut-row{display:flex;justify-content:center;gap:40px;margin-top:40px;flex-wrap:wrap}.shortcut{display:flex;flex-direction:column;align-items:center;gap:8px;text-decoration:none;color:var(--text);font-size:14px}.shortcut-circle{display:flex;align-items:center;justify-content:center;width:60px;height:60px;border-radius:50%;border:1px solid var(--border);background:var(--card);color:var(--brand);transition:background .12s ease,box-shadow .12s ease}.shortcut:hover .shortcut-circle{background:var(--accent-soft);box-shadow:var(--shadow)}.shortcut:focus-visible{outline:none}.shortcut:focus-visible .shortcut-circle{outline:2px solid var(--accent);outline-offset:2px}.error-banner{margin-top:20px;padding:12px 16px;background:var(--danger-bg);color:var(--danger);border-radius:var(--radius);font-size:13px}.history-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}.history-item{display:flex;align-items:center;gap:16px;padding:14px 16px;border:1px solid var(--border);border-radius:var(--radius);background:var(--card)}.history-item:hover{border-color:#c7d2fe}.history-main{flex:1;min-width:0;display:flex;flex-direction:column;gap:4px}.history-text{font-weight:600}.history-meta{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--muted)}.tag{padding:1px 7px;border-radius:var(--radius-sm);background:var(--accent-soft);color:var(--accent);font-weight:500}.history-time{font-size:12px;color:var(--muted);white-space:nowrap}.history-actions{display:flex;gap:6px}.history-actions button{padding:5px 10px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--card);color:var(--muted);cursor:pointer;font-size:12px}.history-actions button:hover{border-color:var(--accent);color:var(--accent)}.history-actions .danger:hover{border-color:var(--danger);color:var(--danger)}.empty-text{color:var(--muted);font-size:13px}@media (max-width: 620px){.history-item{flex-wrap:wrap}.history-time{order:3}}.admin-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:20px}@media (max-width: 620px){.admin-stats{grid-template-columns:repeat(2,1fr)}}.admin-stats div{padding:14px 16px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);font-size:12px;color:var(--muted)}.admin-stats span{display:block;font-size:22px;font-weight:600;color:var(--text);margin-bottom:2px}.admin-tabs{margin-bottom:16px}.synonym-form{display:flex;align-items:flex-end;gap:12px;flex-wrap:wrap;padding-bottom:18px;margin-bottom:18px;border-bottom:1px solid var(--border)}.synonym-form .lang-field{flex:1;min-width:140px}.synonym-form input,.synonym-form select{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius);font-family:inherit;font-size:14px;color:var(--text)}.btn-danger{background:var(--danger);border-color:var(--danger);color:#fff}.btn-danger:hover{background:#b91c1c;border-color:#b91c1c;color:#fff}.security-question{display:block;font-size:13px;font-weight:500;color:var(--text);margin-bottom:8px}.dialog-box input{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius);font-family:inherit;font-size:14px;margin-bottom:16px}.auth-slot{display:flex;align-items:center;gap:10px;min-width:90px;justify-content:flex-end}.auth-email{font-size:13px;color:var(--muted);max-width:180px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.navbar .btn-primary,a.auth-email{text-decoration:none}a.auth-email:hover{color:var(--accent)}.auth-page{max-width:460px}.auth-card{padding:24px}.auth-form{max-width:none;margin-top:8px}.auth-form .btn-primary{margin-top:4px}.auth-note{margin:18px 0 0;padding-top:16px;border-top:1px solid var(--border);font-size:12px;color:var(--muted);line-height:1.6}.history-hint{margin:0 0 16px;padding:10px 14px;background:var(--accent-soft);border-radius:var(--radius);font-size:13px;color:var(--muted)}.history-hint a{color:var(--accent);font-weight:500}.dict-toolbar{display:flex;align-items:flex-end;gap:12px;margin-bottom:18px}.dict-lang{max-width:220px}.dict-dialect{max-width:160px}.dict-search{flex:1;min-width:0}.dict-search input{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius);font-family:inherit;font-size:14px;outline:none;color:var(--text)}.dict-search input:focus{border-color:var(--accent);box-shadow:0 0 0 3px #1a73e81f}.dict-total{font-size:12px;color:var(--muted);white-space:nowrap;padding-bottom:11px}.dict-letters{display:flex;flex-wrap:wrap;gap:6px;padding-bottom:16px;margin-bottom:16px;border-bottom:1px solid var(--border)}.dict-letters button{min-width:34px;padding:6px 8px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--card);color:var(--muted);font-size:14px;font-weight:500;cursor:pointer}.dict-letters button:hover{border-color:var(--accent);color:var(--accent)}.dict-letters button.active{background:var(--accent);border-color:var(--accent);color:#fff}.dict-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:8px}.dict-word{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:10px 14px;border:1px solid var(--border);border-radius:var(--radius);background:var(--card);color:var(--text);font-size:14px;text-align:left;cursor:pointer}.dict-word:hover{border-color:var(--accent);color:var(--accent)}.dict-word-missing{color:var(--muted);background:var(--bg)}.dict-flag{font-size:11px;color:var(--muted);border:1px solid var(--border);border-radius:var(--radius-sm);padding:1px 6px;white-space:nowrap}@media (max-width: 620px){.dict-toolbar{flex-wrap:wrap}.dict-lang{max-width:none;flex:1}}.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%);padding:11px 20px;border-radius:999px;background:#1e293b;color:#fff;font-size:13px;box-shadow:0 4px 16px #0f172a33;z-index:100}.admin-form{display:flex;flex-direction:column;gap:14px;max-width:420px}.admin-form label{display:block;font-size:12px;color:var(--muted);margin-bottom:6px}.admin-form input,.admin-form select{width:100%;padding:9px 12px;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:14px;font-family:inherit}.status-text{font-size:13px;color:var(--muted);margin-top:14px}.dialog-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172a73;display:flex;align-items:center;justify-content:center;z-index:50}.dialog-box{background:var(--card);border-radius:var(--radius);padding:24px;min-width:340px}.dialog-box h3{margin:0 0 8px;font-size:16px}.dialog-box p{margin:0 0 20px;color:var(--muted);font-size:14px}.favorite-item{position:relative}.favorite-item .dict-word{width:100%}.favorite-toggle,.favorite-remove{position:absolute;top:50%;right:8px;transform:translateY(-50%);border:none;background:none;cursor:pointer;font-size:15px;line-height:1;color:var(--border);padding:4px}.favorite-toggle:hover,.favorite-remove:hover{color:#fb7185}.favorite-toggle.on,.favorite-remove{color:#e11d48}.guide-card{max-width:760px;margin:0 auto}.guide-section{margin-bottom:24px}.guide-heading{font-size:13px;font-weight:700;letter-spacing:.04em;color:var(--accent-hover);margin:0 0 10px;padding-bottom:8px;border-bottom:1px solid var(--border)}.guide-item{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:8px;background:var(--card)}.guide-item.open{border-color:var(--accent)}.guide-question{width:100%;display:flex;justify-content:space-between;align-items:center;gap:12px;padding:14px 16px;border:none;background:none;cursor:pointer;font-size:14px;font-weight:600;text-align:left;color:var(--text)}.guide-caret{color:var(--accent);font-size:18px;line-height:1}.guide-answer{padding:0 16px 14px}.guide-answer p{margin:0 0 8px;font-size:13px;color:var(--muted);line-height:1.6}.guide-answer p:last-child{margin-bottom:0}.topic-card{display:flex;flex-direction:column;gap:10px;text-align:left;cursor:pointer;padding:18px;border:1px solid var(--border);border-radius:var(--radius);background:var(--card);transition:transform .12s ease,box-shadow .12s ease}.topic-card:hover{border-color:var(--accent)}.learn-toolbar{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;flex-wrap:wrap;margin-bottom:20px}.topic-lang-tag{font-size:11px;font-weight:700;padding:2px 8px;border-radius:999px;background:var(--accent-soft);color:var(--accent-hover);vertical-align:middle}.topic-card.locked{opacity:.65}.topic-card.empty{background:var(--bg);border-style:dashed}.topic-card-top{display:flex;justify-content:space-between;align-items:center}.topic-card-flags{display:flex;align-items:center;gap:8px}.topic-updating{font-size:11px;font-weight:600;padding:3px 8px;border-radius:999px;background:var(--card);border:1px solid var(--border);color:var(--muted)}.topic-card-name{margin:0;font-size:15px;font-weight:600}.topic-card-progress{display:flex;flex-direction:column;gap:6px}.topic-card-progress span{font-size:12px;color:var(--muted)}.topic-progress-bar,.learn-progress-bar{height:6px;border-radius:999px;background:var(--bg);overflow:hidden;border:1px solid var(--border)}.topic-progress-fill,.learn-progress-fill{height:100%;background:var(--accent);border-radius:999px}.level-badge{font-size:11px;font-weight:700;padding:3px 10px;border-radius:999px;background:transparent;color:var(--accent-hover);border:1px solid currentColor}.level-badge.level-intermediate{color:#b45309}.level-badge.level-advanced{color:#1e3a5f}.learn-path{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:28px}.path-level-head{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:14px}.path-level-count{font-size:13px;color:var(--muted)}.path-level-lock{font-size:12px;color:var(--muted);margin-left:auto}.path-steps{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:14px}.path-step{position:relative;display:grid;grid-template-columns:40px 1fr;gap:16px;align-items:center}.path-step:before{content:"";position:absolute;left:19px;top:50%;width:2px;height:calc(100% + 14px);background:var(--border)}.path-step:last-child:before{display:none}.path-step.done:before{background:var(--accent)}.path-node{position:relative;z-index:1;width:40px;height:40px;border-radius:50%;display:grid;place-items:center;font-size:14px;font-weight:700;background:var(--card);border:2px solid var(--border);color:var(--muted)}.path-step.done .path-node{background:var(--accent);border-color:var(--accent);color:#fff}.path-step.current .path-node{border-color:var(--accent);color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}.path-step.locked .path-node{font-size:15px}.path-step .topic-card-top{justify-content:flex-end}.topic-card-flags:empty{display:none}.topic-card-top:not(:has(.level-badge)):has(>.topic-card-flags:empty){display:none}.topic-card.current{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.topic-next{font-size:11px;font-weight:700;padding:3px 10px;border-radius:999px;background:var(--accent);color:#fff}@media (max-width: 600px){.path-step{grid-template-columns:32px 1fr;gap:10px}.path-step:before{left:15px}.path-node{width:32px;height:32px;font-size:13px}}.lesson-list{display:flex;flex-direction:column;gap:8px}.lesson-item{display:flex;justify-content:space-between;align-items:center;text-decoration:none;padding:14px 16px;border:1px solid var(--border);border-radius:var(--radius);color:var(--text);background:var(--card)}.lesson-item:hover{border-color:var(--accent)}.lesson-item.completed{background:var(--accent-soft)}.lesson-item.empty{border-style:dashed;background:var(--bg)}.lesson-item-meta{font-size:12px;color:var(--muted)}.vocabulary-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:10px;margin:16px 0}.vocabulary-tile{display:flex;flex-direction:column;align-items:center;gap:4px;padding:12px;border:1px solid var(--border);border-radius:var(--radius);background:var(--card);cursor:pointer;font-size:13px;text-align:center}.vocabulary-tile.selected{border-color:var(--accent);background:var(--accent-soft);color:var(--accent-hover)}.vocabulary-tile.missing{border-style:dashed;color:var(--muted);background:var(--bg)}.vocabulary-flag{font-size:10px;color:var(--muted)}.lesson-head,.learn-play-top{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:12px}.learn-play-top{justify-content:flex-end}.hearts-bar{display:inline-flex;align-items:center;gap:8px;font-size:13px}.hearts-icons{display:inline-flex;gap:2px;font-size:15px;line-height:1}.heart-on{color:#e11d48}.heart-off{color:var(--border)}.hearts-count{color:var(--muted)}.hearts-unlimited{color:var(--accent-hover);font-weight:600}.hearts-lost-note{margin:8px 0 0;font-size:12px;color:var(--danger);text-align:right}.learn-progress-header{margin-bottom:16px}.learn-progress-top{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:8px}.learn-progress-count{font-size:12px;color:var(--muted)}.exercise-body{display:flex;flex-direction:column;gap:16px}.sign-choice-prompt{font-size:19px;font-weight:600;margin:0}.answer-options{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}@media (max-width: 600px){.answer-options{grid-template-columns:1fr}}.answer-option{display:flex;flex-direction:column;gap:4px;padding:14px 16px;border:2px solid var(--border);border-radius:var(--radius);background:var(--card);cursor:pointer;font-size:17px;text-align:left;color:var(--text)}.answer-option:hover:not(:disabled){border-color:var(--accent)}.answer-option:disabled{cursor:default;opacity:1}.answer-option.selected{border-color:var(--accent);background:var(--accent-soft);color:var(--accent-hover)}.answer-option.answer-correct{border-color:#16a34a;background:#f0fdf4;color:#15803d}.answer-option.answer-wrong{border-color:var(--danger);background:var(--danger-bg);color:var(--danger)}.answer-tag{font-size:11px;font-weight:700}.mini-sign-stage.stage-correct{border-color:#16a34a;box-shadow:0 0 0 3px #16a34a26}.mini-sign-stage.stage-wrong{border-color:var(--danger);box-shadow:0 0 0 3px #dc26261f}.mini-sign-label.label-correct{color:#15803d;font-weight:700}.mini-sign-label.label-wrong{color:var(--danger);font-weight:700}.mini-sign-stage{position:relative}.mini-sign-badge{position:absolute;top:8px;left:8px;z-index:1;width:22px;height:22px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-sm);background:var(--accent-soft);color:var(--accent-hover);font-size:12px;font-weight:700}.tf-body{align-items:center;max-width:820px;margin:0 auto}.tf-body .mini-sign-stage{width:100%;cursor:default}.tf-body .mini-sign-canvas{height:420px}.tf-claim{font-size:20px;text-align:center;margin:4px 0}.tf-actions{display:grid;grid-template-columns:1fr 1fr;gap:12px;width:100%}.tf-button{padding:20px;border:2px solid var(--border);border-radius:var(--radius);background:var(--card);font-size:20px;font-weight:700;cursor:pointer;color:var(--text)}.tf-button:hover:not(:disabled){border-color:var(--accent)}.tf-button.selected{border-color:var(--accent);background:var(--accent-soft);color:var(--accent-hover)}.tf-button.answer-correct{border-color:#16a34a;background:#f0fdf4;color:#15803d}.tf-button.answer-wrong{border-color:var(--danger);background:var(--danger-bg);color:var(--danger)}.tf-button:disabled{cursor:default}.fingerspell-body{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:start}@media (max-width: 720px){.fingerspell-body{grid-template-columns:1fr}}.fingerspell-stage .mini-sign-stage{width:100%;cursor:default}.fingerspell-dots{display:flex;gap:6px;justify-content:center;margin-top:10px}.fingerspell-dots span{width:8px;height:8px;border-radius:999px}.dot-on{background:var(--accent)}.dot-off{background:var(--border)}.fingerspell-hint{font-size:12px;color:var(--muted);text-align:center;margin:8px 0 0}.fingerspell-input{display:flex;flex-direction:column;gap:8px}.fingerspell-input label{font-size:14px;font-weight:600}.fingerspell-input input{padding:14px 16px;border:2px solid var(--border);border-radius:var(--radius);font-size:16px;font-family:inherit;color:var(--text)}.fingerspell-input input:focus{outline:none;border-color:var(--accent)}.fingerspell-input input.input-correct{border-color:#16a34a;background:#f0fdf4}.fingerspell-input input.input-wrong{border-color:var(--danger);background:var(--danger-bg)}.answer-tag-correct{color:#15803d}.match-grid{position:relative;display:grid;grid-template-columns:1fr 1fr;column-gap:72px}.match-column{display:flex;flex-direction:column;gap:12px}.match-list{flex:1;display:flex;flex-direction:column;justify-content:center;gap:14px}.match-lines{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;pointer-events:none;overflow:visible}.match-lines line{stroke:var(--accent);stroke-width:3;stroke-linecap:round}.match-lines circle{fill:var(--accent)}.match-lines .line-correct line{stroke:#16a34a}.match-lines .line-correct circle{fill:#16a34a}.match-lines .line-wrong line{stroke:var(--danger);stroke-dasharray:6 5}.match-lines .line-wrong circle{fill:var(--danger)}.match-heading{font-size:12px;letter-spacing:.06em;color:var(--muted);margin:0 0 4px;text-align:center}.match-tile{padding:18px;border:2px solid var(--border);border-radius:var(--radius);background:var(--card);font-size:18px;cursor:pointer;color:var(--text)}.match-tile:hover:not(:disabled){border-color:var(--accent)}.match-tile.pending{border-color:var(--accent);background:var(--accent-soft);color:var(--accent-hover)}.match-tile.linked{background:#eff6ff;border-color:#bfdbfe}.match-sign-row .mini-sign-stage{width:100%}.match-sign-row .mini-sign-canvas{height:220px}@media (max-width: 600px){.match-grid{column-gap:32px}.match-sign-row .mini-sign-canvas{height:150px}.tf-body .mini-sign-canvas{height:260px}.match-tile{font-size:15px;padding:12px}}.match-hint{font-size:14px;color:var(--muted);text-align:center;margin:4px 0 0}.cloze-sequence{display:grid;grid-template-columns:repeat(auto-fit,minmax(max(260px,30%),1fr));gap:12px}.cloze-step{display:flex}.cloze-step .mini-sign-stage{width:100%;cursor:default}.cloze-step .mini-sign-canvas{height:200px}.cloze-blank{position:relative;width:100%;min-height:200px;display:flex;align-items:center;justify-content:center;border:2px dashed var(--accent);border-radius:var(--radius);background:var(--accent-soft);font-size:56px;font-weight:700;color:var(--accent-hover)}.cloze-blank-num{position:absolute;top:8px;left:10px;font-size:13px;font-weight:700}.cloze-hint{margin:4px 0 0;padding:10px 14px;border-radius:var(--radius);font-size:15px;background:var(--accent-soft);color:var(--text);letter-spacing:.5px}.cloze-input input{font-size:22px;text-align:center;max-width:320px}@media (max-width: 600px){.cloze-sequence{grid-template-columns:repeat(2,1fr)}.cloze-step .mini-sign-canvas,.cloze-blank{height:150px;min-height:150px}}.sign-choice-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.mini-sign-stage{display:flex;flex-direction:column;padding:0;border:2px solid var(--border);border-radius:var(--radius);overflow:hidden;cursor:pointer;background:var(--viewer-bg)}.mini-sign-stage{transition:opacity .15s,box-shadow .15s,border-color .15s}.mini-sign-stage.selected{border-color:var(--accent);border-width:4px;box-shadow:0 0 0 4px #1a73e859}.mini-sign-stage.selected .mini-sign-badge{background:var(--accent);color:#fff}.mini-sign-stage.selected:after{content:"✓ Đã chọn";position:absolute;right:10px;bottom:10px;z-index:2;padding:5px 12px;border-radius:999px;background:var(--accent);color:#fff;font-size:14px;font-weight:700}.sign-choice-grid:has(.mini-sign-stage.selected) .mini-sign-stage:not(.selected){opacity:.5}.mini-sign-canvas{width:100%;height:260px;display:flex;align-items:center;justify-content:center;background:#000}.mini-sign-error{font-size:12px;color:var(--danger);padding:6px 10px}.mini-sign-label{font-size:15px;padding:8px 12px;color:var(--muted)}.video-credit{margin:6px 0 0;font-size:12px;color:var(--muted);text-align:center;font-style:italic}.feedback-banner{display:flex;gap:10px;padding:14px 16px;border-radius:var(--radius);font-size:13px}.feedback-banner p{margin:4px 0 0}.feedback-correct{background:#f0fdf4;color:#16a34a}.feedback-wrong{background:var(--danger-bg);color:var(--danger)}.feedback-icon{font-size:18px;line-height:1}.feedback-explanation{color:var(--text)}.exercise-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:16px}.learn-result-card{max-width:640px;margin:0 auto}.learn-result-score{display:flex;flex-direction:column;align-items:center;gap:4px;padding:24px;border-radius:var(--radius);margin:16px 0}.learn-result-score.passed{background:#f0fdf4;color:#16a34a}.learn-result-score.failed{background:var(--danger-bg);color:var(--danger)}.learn-result-percent{font-size:36px;font-weight:800}.learn-result-stats{display:flex;gap:16px;justify-content:center;font-size:13px;color:var(--muted);flex-wrap:wrap}.learn-result-note{text-align:center;font-size:13px;color:var(--muted)}.learn-result-wrong{margin-top:20px;display:flex;flex-direction:column;gap:10px}.learn-result-wrong-item{padding:12px 14px;border:1px solid var(--border);border-radius:var(--radius)}.learn-result-wrong-item p{margin:0;font-size:13px}.learn-result-explanation{color:var(--muted)!important;margin-top:4px!important}.dialog-actions{display:flex;gap:10px;justify-content:flex-end}.renew-banner{padding:10px 16px;background:var(--accent-soft);color:var(--text);border-bottom:1px solid var(--border);font-size:14px;text-align:center}.pro-plan{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 0;border-top:1px solid var(--border)}.pro-note{font-size:12px;color:var(--muted)}.ck{display:flex;flex-direction:column;gap:8px;margin-top:12px}.ck-qr{display:block;width:min(320px,100%);height:auto;margin:4px auto;border-radius:var(--radius);border:1px solid var(--border)}.ck-dong{display:flex;align-items:center;gap:8px;padding:6px 0;border-bottom:1px solid var(--border)}.ck-nhan{flex:0 0 110px;color:var(--muted)}.ck-gia-tri{flex:1;word-break:break-all}.ck-chep{padding:4px 10px;font-size:12px}.ck-cho{font-weight:600;color:var(--accent)}.ck-canh-bao{margin:4px 0;padding:10px 12px;border-radius:var(--radius);background:var(--danger-bg);color:var(--danger);font-weight:700}.ck-ten{text-decoration:underline}.brand-logo-btn{padding:0;border:none;background:none;cursor:zoom-in;display:flex;border-radius:var(--radius-sm)}.brand-logo-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.brand-name{color:inherit;text-decoration:none}.logo-box{text-align:center;cursor:zoom-out;max-width:calc(100vw - 32px)}.logo-full{width:min(420px,80vw);height:auto;display:block;margin:0 auto 12px}.dialog-box p.logo-caption{margin:0}.link-button{padding:0;border:none;background:none;font:inherit;color:var(--text);text-align:left;cursor:pointer}.link-button:hover{color:var(--accent);text-decoration:underline}.link-button:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.password-field{position:relative}.password-field input{width:100%;padding-right:42px;box-sizing:border-box}.password-toggle{position:absolute;top:50%;right:6px;transform:translateY(-50%);display:flex;padding:6px;border:none;background:none;color:var(--muted);cursor:pointer;border-radius:var(--radius-sm)}.password-toggle:hover{color:var(--accent)}.password-toggle:focus-visible{outline:2px solid var(--accent);outline-offset:1px}.account-security{margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}.account-security .pro-note{margin:6px 0 0}.field-hint{display:block;margin-top:4px;font-size:12px;color:var(--muted)}.retry-note{display:inline-block;margin:8px 0 0;padding:3px 10px;border-radius:999px;font-size:12px;font-weight:600;background:var(--danger-bg);color:var(--danger)}.lesson-item.current{border-color:var(--accent)}.lesson-item.locked{opacity:.6}.topic-test{margin-top:16px;display:flex;flex-direction:column;align-items:flex-start;gap:6px}.topic-test .btn:disabled{opacity:.5;cursor:not-allowed}.topic-done{font-size:11px;font-weight:700;padding:3px 8px;border-radius:999px;background:var(--accent-soft);color:var(--accent-hover)}.learn-status{display:inline-flex;align-items:center;gap:10px;padding:4px 10px;border-radius:999px;border:1px solid var(--border);font-size:13px;font-weight:600;color:var(--text);text-decoration:none}.learn-status:hover{border-color:var(--accent)}.learn-status .streak-off{opacity:.45;filter:grayscale(1)}.learn-status-hearts{color:var(--danger)}.streak-note{color:var(--text)}.leaderboard-table{width:100%;border-collapse:collapse;font-size:14px}.leaderboard-table th,.leaderboard-table td{padding:10px 12px;border-bottom:1px solid var(--border);text-align:left}.leaderboard-table th{font-size:12px;color:var(--muted);font-weight:600}.leaderboard-table .leaderboard-num{text-align:right;white-space:nowrap}.leaderboard-rank{width:56px;font-weight:700}.leaderboard-muted{color:var(--muted)}.leaderboard-me td{background:var(--accent-soft);font-weight:600}.test-stars{letter-spacing:2px;font-size:18px}.fast-sign-stage{position:relative;display:flex;align-items:center;justify-content:center;height:380px;border-radius:var(--radius);background:#000;overflow:hidden}.fast-sign-stage .sign-video{width:100%;height:100%;object-fit:contain}.fast-sign-start{position:absolute}.fast-sign-done{color:#fff;font-weight:600}.builder-answer{display:flex;flex-wrap:wrap;gap:8px;min-height:56px;padding:10px;align-items:center;border:2px dashed var(--border);border-radius:var(--radius)}.builder-answer.input-correct{border-color:#16a34a;background:#f0fdf4}.builder-answer.input-wrong{border-color:var(--danger);background:var(--danger-bg)}.builder-bank{display:flex;flex-wrap:wrap;gap:8px}.builder-tile{padding:10px 14px;border:1px solid var(--border);border-radius:var(--radius);background:var(--card);color:var(--text);font-size:15px;cursor:pointer}.builder-tile:hover:not(:disabled){border-color:var(--accent)}.builder-tile.placed{background:var(--accent-soft);border-color:var(--accent);color:var(--accent-hover)}@media (max-width: 600px){.fast-sign-stage{height:240px}}.exercise-page .exercise-body .mini-sign-canvas,.exercise-page .viewer-stage,.exercise-page .fast-sign-stage{position:relative;height:auto;min-height:0;aspect-ratio:16 / 9}.exercise-page .fast-sign-stage{max-width:720px;margin:0 auto;width:100%}.exercise-page .exercise-body .mini-sign-canvas .sign-video,.exercise-page .viewer-stage .sign-video,.exercise-page .fast-sign-stage .sign-video{width:100%;height:100%;max-width:none;max-height:none;border-radius:0}.exercise-page .exercise-body .mini-sign-canvas:after,.exercise-page .viewer-stage:after,.exercise-page .fast-sign-stage:after{content:"";position:absolute;left:35%;right:0;top:4%;height:11%;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);background:#1f738c59;pointer-events:none;z-index:1}.exercise-page .cloze-blank{min-height:0;height:auto;aspect-ratio:16 / 9}.exercise-page:has(.cloze-sequence){max-width:1760px}.topic-test-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.btn-advanced{background:#1e3a5f;border-color:#1e3a5f}.btn-advanced:hover:not(:disabled){background:#162c49;border-color:#162c49}.advanced-zone{margin-top:28px;padding-top:20px;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:12px}.advanced-zone-title{margin:0;font-size:16px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}.advanced-zone-title .badge{font-size:11px;font-weight:600;padding:2px 8px;border-radius:var(--radius);color:var(--accent);background:var(--accent-soft)}.advanced-zone-title .badge-free{color:#15803d;background:#dcfce7}button.shortcut{border:0;background:none;padding:0;cursor:pointer;font:inherit}.sentence-sheet{width:min(640px,calc(100vw - 32px));max-height:min(680px,calc(100vh - 64px));padding:0;border:1px solid var(--border);border-radius:var(--radius);background:var(--card);color:var(--text);box-shadow:0 8px 24px #0f172a1f;overflow:hidden}.sentence-sheet[open]{display:flex;flex-direction:column;animation:sheet-in .18s ease-out}.sentence-sheet::backdrop{background:#0f172a73}@keyframes sheet-in{0%{opacity:0;transform:translateY(12px)}}@media (prefers-reduced-motion: reduce){.sentence-sheet[open]{animation:none}}.sentence-sheet-head{display:flex;align-items:center;gap:12px;padding:20px 20px 12px}.sentence-sheet-head>div{flex:1;min-width:0}.sentence-sheet-head h2{margin:0;font-size:17px;font-weight:600}.sentence-sheet-head p{margin:2px 0 0;color:var(--muted);font-size:13px}.sentence-sheet-icon{display:flex;align-items:center;justify-content:center;flex:none;width:40px;height:40px;border-radius:50%;background:var(--accent-soft);color:var(--accent)}.sentence-sheet-close{display:flex;align-items:center;justify-content:center;flex:none;width:36px;height:36px;border:0;border-radius:50%;background:none;color:var(--muted);cursor:pointer}.sentence-sheet-close:hover{background:var(--viewer-bg);color:var(--text)}.sentence-tabs{display:flex;flex-wrap:wrap;gap:6px;padding:4px 20px 12px;border-bottom:1px solid var(--border)}.sentence-tabs::-webkit-scrollbar{display:none}.sentence-tabs button{flex:none;padding:7px 14px;border:1px solid transparent;border-radius:999px;background:var(--viewer-bg);color:var(--muted);font-size:13px;font-weight:500;cursor:pointer;transition:background .12s ease,color .12s ease}.sentence-tabs button:hover{color:var(--text)}.sentence-tabs button.active{background:var(--accent);color:#fff}.sentence-list{list-style:none;margin:0;padding:12px 20px 20px;overflow-y:auto;overflow-x:hidden;display:grid;gap:8px}.sentence-list button{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;padding:12px 14px;border:1px solid var(--border);border-radius:var(--radius);background:var(--card);color:var(--text);font-size:14px;text-align:left;cursor:pointer;transition:border-color .12s ease,background .12s ease}.sentence-play{display:flex;align-items:center;justify-content:center;flex:none;width:28px;height:28px;border-radius:50%;background:var(--viewer-bg);color:var(--muted);transition:background .12s ease,color .12s ease}.sentence-list button:hover:not(:disabled){border-color:var(--accent);background:var(--accent-soft)}.sentence-list button:hover:not(:disabled) .sentence-play,.sentence-list button.active .sentence-play{background:var(--accent);color:#fff}.sentence-list button.active{border-color:var(--accent);background:var(--accent-soft);color:var(--accent);font-weight:600}.sentence-list button:focus-visible,.sentence-tabs button:focus-visible,.sentence-sheet-close:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.sentence-list button:disabled{opacity:.6;cursor:wait}.sentence-spell{margin-left:8px;padding:1px 8px;border-radius:999px;background:var(--viewer-bg);color:var(--muted);font-size:11px;font-weight:500;white-space:nowrap}@media (max-width: 600px){.sentence-sheet{width:100vw;max-width:100vw;max-height:85vh;margin:auto 0 0;border-radius:var(--radius) var(--radius) 0 0}.sentence-sheet-head{padding:16px 16px 10px}.sentence-tabs{flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none;padding:4px 16px 12px}.sentence-list{padding:12px 16px 24px}.shortcut-row{gap:20px}}.lesson-actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:16px}.btn-outline{background:var(--card);color:#1e3a5f;border:1px solid #1e3a5f;display:inline-flex;align-items:center;gap:8px}.btn-outline:hover:not(:disabled){background:#f5f3ff}.btn-outline:disabled{opacity:.55;cursor:not-allowed}.btn-outline .badge{font-size:11px;font-weight:600;padding:1px 7px;border-radius:var(--radius);color:#1e3a5f;background:transparent;border:1px solid #1e3a5f}.adv-chooser{display:flex;flex-direction:column;gap:8px;margin-top:12px;padding:12px;border:1px solid var(--border);border-radius:var(--radius)}.adv-chooser .btn{justify-content:space-between;display:flex;text-align:left}.adv-dang.done{border-color:#16a34a}.draft-tag{margin:0 0 8px;font-size:12px;color:#92400e;background:#fffbeb;border:1px solid #fde68a;padding:4px 10px;border-radius:var(--radius-sm);display:inline-block}.seq-player{display:flex;flex-direction:column;gap:8px}.seq-label{font-size:13px;font-weight:600;color:var(--muted)}.seq-stage{position:relative;width:100%;max-width:420px;aspect-ratio:16 / 9;background:var(--viewer-bg);border-radius:var(--radius);overflow:hidden}.seq-stage .sign-video{width:100%;height:100%;object-fit:contain}.seq-count{position:absolute;right:8px;top:8px;font-size:12px;background:#0f172a99;color:#fff;padding:2px 8px;border-radius:var(--radius)}.seq-controls{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.seq-speed{display:inline-flex;gap:4px}.seq-speed .btn{padding:4px 8px;font-size:12px}.dialogue-turns{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}.dialogue-question{margin:4px 0 0}.site-footer{padding:20px 16px 28px;border-top:1px solid var(--border);color:var(--muted);font-size:13px;text-align:center;overflow-wrap:anywhere}.site-footer a{color:var(--accent);text-decoration:none;font-weight:500}.site-footer a:hover{text-decoration:underline}.ung-ho-hop{width:min(680px,calc(100vw - 32px));min-width:0;padding:32px 36px;max-height:calc(100vh - 32px);overflow-y:auto}.ung-ho-dau{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}.ung-ho-nhan{padding:3px 12px;border-radius:999px;background:var(--viewer-bg);color:var(--muted);font-size:13px;font-weight:600;text-transform:uppercase;letter-spacing:.04em}.ung-ho-dem{color:var(--accent);font-size:16px;font-weight:600;font-variant-numeric:tabular-nums}.ung-ho-tien-do{height:6px;margin-bottom:22px;border-radius:999px;background:var(--viewer-bg);overflow:hidden}.ung-ho-tien-do span{display:block;height:100%;background:var(--accent);transition:width .25s linear}.ung-ho-hop h3{font-size:24px;margin-bottom:12px}.dialog-box.ung-ho-hop p{margin:0 0 12px;color:var(--text);font-size:16px;line-height:1.6}.ung-ho-qr{margin:20px auto;text-align:center}.ung-ho-qr img{display:block;width:min(340px,44vh,80%);height:auto;margin:0 auto;border-radius:var(--radius)}.ung-ho-qr figcaption{margin-top:10px;color:var(--muted);font-size:14px}.ung-ho-hop-tac{display:flex;flex-direction:column;gap:4px;margin-bottom:22px;padding:16px 18px;border:1px dashed var(--accent);border-radius:var(--radius);background:var(--accent-soft);font-size:15px;line-height:1.55}.ung-ho-hop-tac strong{color:var(--accent)}.ung-ho-hop-tac a{color:var(--accent);font-weight:600;overflow-wrap:anywhere}.ung-ho-hop .dialog-actions .btn{padding:12px 28px;font-size:16px}@media (max-width: 600px){.ung-ho-hop{padding:22px 18px}.ung-ho-hop h3{font-size:20px}}.simulate-banner{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:6px 12px;padding:8px 16px;background:#fff7e6;color:#8a5300;border-bottom:1px solid #f5d9a8;font-size:13px;text-align:center}.simulate-banner button{padding:4px 12px;border:1px solid #d9a441;border-radius:999px;background:#fff;color:#8a5300;font:inherit;font-weight:600;cursor:pointer}.simulate-banner button:hover{background:#ffedc7}.account-simulate{margin-top:16px;padding-top:16px;border-top:1px solid var(--border)}.account-simulate .dialog-actions{justify-content:flex-start;flex-wrap:wrap}.sim-switch{position:relative}.sim-switch-btn{padding:6px 12px;border:1px solid var(--border);border-radius:999px;background:var(--card);color:var(--muted);font:inherit;font-size:12px;white-space:nowrap;cursor:pointer}.sim-switch-btn strong{color:var(--text)}.sim-switch-btn:hover{border-color:var(--accent)}.sim-switch-btn.on{border-color:#d9a441;background:#fff7e6;color:#8a5300}.sim-switch-btn.on strong{color:#8a5300}.sim-switch-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.sim-switch-menu{position:absolute;top:calc(100% + 8px);right:0;z-index:40;width:min(320px,calc(100vw - 32px));padding:8px;border:1px solid var(--border);border-radius:var(--radius);background:var(--card);box-shadow:0 4px 16px #0f172a1f}.sim-switch-title{margin:4px 8px 8px;color:var(--muted);font-size:12px}.sim-switch-menu button{display:flex;flex-direction:column;gap:2px;width:100%;padding:10px 12px;border:1px solid transparent;border-radius:var(--radius-sm);background:none;color:var(--text);font:inherit;text-align:left;cursor:pointer}.sim-switch-menu button:hover:not(:disabled){background:var(--viewer-bg)}.sim-switch-menu button.active{border-color:var(--accent);background:var(--accent-soft)}.sim-switch-menu button:disabled{opacity:.6;cursor:wait}.sim-switch-menu button:focus-visible{outline:2px solid var(--accent);outline-offset:1px}.sim-switch-label{font-size:13px;font-weight:600}.sim-switch-menu button.active .sim-switch-label{color:var(--accent)}.sim-switch-note{color:var(--muted);font-size:12px;line-height:1.4}.sim-switch-error{margin:6px 8px 2px;color:var(--danger);font-size:12px}.word-pool{margin-top:14px;padding:12px 14px;border:1px solid var(--border);border-radius:var(--radius);background:var(--viewer-bg);font-size:13px;line-height:1.5}.word-pool p{margin:4px 0 0;color:var(--muted)}.word-pool-chip{display:inline-block;margin:2px 4px 0 0;padding:1px 8px;border-radius:999px;background:var(--card);border:1px solid var(--border);color:var(--text)}.exercise-page{font-size:17px;line-height:1.5;letter-spacing:.005em;--muted: #475569}.exercise-page .card{padding:28px 32px}.exercise-page .sign-choice-prompt{font-size:24px;font-weight:700;line-height:1.35}.exercise-page .answer-option{font-size:21px;font-weight:500;padding:18px 20px}.exercise-page .answer-tag{font-size:14px}.exercise-page .tf-claim{font-size:26px;font-weight:600}.exercise-page .tf-button{font-size:22px;padding:18px}.exercise-page .match-tile{font-size:21px}.exercise-page .match-heading,.exercise-page .match-hint,.exercise-page .fingerspell-hint{font-size:15px}.exercise-page .fingerspell-input label{font-size:17px}.exercise-page .fingerspell-input input{font-size:22px;padding:16px 18px}.exercise-page .builder-tile{font-size:21px;font-weight:500;padding:14px 20px}.exercise-page .builder-answer{min-height:72px}.exercise-page .builder-answer .lesson-item-meta,.exercise-page .lesson-item-meta{font-size:16px;color:var(--muted)}.exercise-page .mini-sign-label{font-size:18px}.exercise-page .mini-sign-badge{font-size:15px;min-width:26px;height:26px}.exercise-page .feedback-banner{font-size:17px;padding:16px 20px}.exercise-page .feedback-banner strong{font-size:19px}.exercise-page .feedback-icon{font-size:24px}.exercise-page .learn-progress-count,.exercise-page .hearts-bar{font-size:15px}.exercise-page .learn-progress-top strong,.exercise-page .learn-progress-top span:first-child{font-size:17px;font-weight:600}.exercise-page .video-credit,.exercise-page .retry-note{font-size:14px}.exercise-page .btn-primary,.exercise-page .btn-ghost{font-size:18px;padding:12px 26px}.vocabulary-tile{font-size:16px;font-weight:500}.vocabulary-flag{font-size:12px}.lesson-item-meta{font-size:14px}@media (max-width: 600px){.exercise-page{font-size:16px}.exercise-page .card{padding:18px 16px}.exercise-page .sign-choice-prompt{font-size:20px}.exercise-page .answer-option,.exercise-page .builder-tile,.exercise-page .match-tile{font-size:18px}}.learn-toolbar .card-title{font-size:28px;font-weight:800;margin-bottom:8px}.learn-toolbar .empty-text{font-size:16px;line-height:1.55;color:var(--muted)}.lang-field label{font-size:15px;font-weight:600}.lang-field select,.lang-field .static-value{font-size:17px}.path-level-head{padding:0 0 10px;margin-bottom:20px;gap:14px;border-bottom:1px solid var(--border)}.path-level-head .level-badge{font-size:24px;font-weight:800;padding:0;background:none;border:0;letter-spacing:.01em;color:var(--accent-hover)}.path-level-head .level-badge.level-intermediate{color:#b45309}.path-level-head .level-badge.level-advanced{color:#1e3a5f}.path-level-count{font-size:16px;font-weight:600;color:var(--muted)}.path-level-lock{font-size:15px}.path-node{font-size:18px;font-weight:700}.topic-card-name{font-size:21px;font-weight:700;line-height:1.3}.topic-card-progress span{font-size:15px}.topic-card{padding:20px 22px}.topic-next,.topic-done,.topic-updating{font-size:14px}.topic-lang-tag,.level-badge{font-size:13px}.lesson-item{padding:18px 20px;font-size:18px;font-weight:600}.lesson-item-meta{font-size:15px;font-weight:400}.card-title{font-size:22px}.subtopic{border:1px solid var(--border);border-radius:var(--radius);background:var(--card)}.subtopic[open]{border-color:var(--accent)}.subtopic-head{display:flex;justify-content:space-between;align-items:center;gap:12px;cursor:pointer;padding:18px 20px;list-style:none;font-size:19px;font-weight:700}.subtopic-head::-webkit-details-marker{display:none}.subtopic-head:before{content:"▸";margin-right:10px;color:var(--accent);transition:transform .15s;display:inline-block}.subtopic[open]>.subtopic-head:before{transform:rotate(90deg)}.subtopic-name{flex:1}.subtopic-count{font-size:15px;font-weight:500;color:var(--muted)}.subtopic-parts{display:flex;flex-direction:column;gap:8px;padding:0 14px 14px 36px}@media (max-width: 600px){.learn-toolbar .card-title{font-size:24px}.path-level-head .level-badge{font-size:20px}.topic-card-name{font-size:18px}}.learn-toolbar>div:first-child{flex:1 1 460px;min-width:0}.learn-toolbar .lang-field{flex:0 0 230px;min-width:0}.learn-toolbar .lang-field .static-value{white-space:normal;font-size:16px;line-height:1.35}.learn-toolbar .lang-field select{width:100%}.learn-toolbar{display:grid;grid-template-columns:minmax(0,1fr) 240px 190px;align-items:end;gap:20px}.learn-toolbar>div:first-child{flex:none}.learn-toolbar .lang-field{flex:none;width:auto}@media (max-width: 900px){.learn-toolbar{grid-template-columns:1fr 1fr}.learn-toolbar>div:first-child{grid-column:1 / -1}}@media (max-width: 520px){.learn-toolbar{grid-template-columns:1fr}}.exercise-page:has(.seq-player){max-width:1500px}.exercise-page .seq-player{width:100%;max-width:860px;margin:0 auto;gap:12px}.exercise-page .dialogue-turns{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.exercise-page .dialogue-turns .seq-player,.exercise-page .seq-stage{max-width:none}.exercise-page .seq-stage:after{content:"";position:absolute;left:35%;right:0;top:4%;height:11%;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);background:#1f738c59;pointer-events:none;z-index:1}.exercise-page .seq-count{top:auto;bottom:10px;right:10px;font-size:14px;z-index:2}.exercise-page .seq-label{font-size:17px}.exercise-page .seq-controls{justify-content:center}.exercise-page .seq-controls .btn,.exercise-page .seq-speed .btn{font-size:16px;padding:8px 14px}.exercise-page .dialogue-question{font-size:21px}@media (max-width: 700px){.exercise-page .dialogue-turns{grid-template-columns:1fr}}.lesson-item{position:relative;overflow:hidden;transition:background .15s,border-color .15s,box-shadow .15s,transform .15s}.lesson-item-name{display:flex;align-items:center;gap:10px;flex-wrap:wrap;min-width:0}.lesson-tag{padding:2px 10px;border-radius:999px;background:var(--accent);color:#fff;font-size:12px;font-weight:600;white-space:nowrap}.lesson-item:not(.locked):hover,.lesson-item:not(.locked):focus-visible{background:var(--accent-soft);border-color:var(--accent)}.lesson-item:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.lesson-item.current{background:var(--card);border-color:var(--accent);border-width:2px;box-shadow:0 0 0 4px var(--accent-soft)}.lesson-item.locked{background:#e5e8ec;color:#7b8694;border-color:transparent;opacity:1;cursor:not-allowed}.lesson-item.locked .lesson-item-meta{color:#7b8694}.lesson-item.locked:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:#0f172a24;pointer-events:none}.lesson-item.empty:not(.locked){opacity:.75}.subtopic.locked-all>.subtopic-head{color:#7b8694;background:#e5e8ec;border-radius:var(--radius)}.subtopic.locked-all[open]>.subtopic-head{border-bottom-left-radius:0;border-bottom-right-radius:0}.subtopic.locked-all{border-color:transparent}.subtopic-head:hover{background:var(--accent-soft);border-radius:var(--radius)}.subtopic.locked-all>.subtopic-head:hover{background:#dadee3}.lesson-next{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin:4px 0 18px;padding:16px 20px;border-radius:var(--radius);text-decoration:none;background:var(--accent);color:#fff;transition:background .15s,transform .15s}.lesson-next:hover{background:var(--accent-hover)}.lesson-next:focus-visible{outline:3px solid var(--accent-soft);outline-offset:2px}.lesson-next-label{font-size:15px;font-weight:700;opacity:.9}.lesson-next-name{flex:1;font-size:19px;font-weight:700}.lesson-next .lesson-item-meta{color:#fff;opacity:.9}.camera-khung{width:100%;border-radius:var(--radius);overflow:hidden;background:var(--viewer-bg);min-height:120px}.camera-hinh{display:block;width:100%;height:auto;transform:scaleX(-1)}.camera-thanh{height:10px;border-radius:var(--radius-sm);background:var(--border);overflow:hidden;margin-top:8px}.camera-thanh i{display:block;height:100%;background:var(--accent);transition:width .1s}@keyframes nhay-nhe{0%,to{box-shadow:0 0 #1a73e899;transform:scale(1)}50%{box-shadow:0 0 0 14px #1a73e800;transform:scale(1.08)}}.nut-nhay .shortcut-circle{background:var(--accent-soft);border-color:var(--accent);color:var(--accent);animation:nhay-nhe 1.5s ease-in-out infinite}.btn.nut-nhay{display:inline-flex;align-items:center;gap:6px;border-color:var(--accent);color:var(--accent);animation:nhay-nhe 1.5s ease-in-out infinite}.btn.nut-nhay:hover{background:var(--accent-soft)}.nut-nhay:active .shortcut-circle,.btn.nut-nhay:active{transform:scale(.96)}.btn.nut-nhay:focus-visible{outline:2px solid var(--accent);outline-offset:2px}@media (prefers-reduced-motion: reduce){.nut-nhay .shortcut-circle,.btn.nut-nhay,.dv-buoc,.dv-chuc-mung{animation:none}}.dv-quay-ve{display:inline-block;margin-bottom:16px}@keyframes hien-dan{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}.dv-buoc{animation:hien-dan .25s ease-out}.dv-buoc h3{display:flex;align-items:center;gap:8px;margin:0 0 8px}.dv-tay{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:16px 0}.dv-tay-o{position:relative;display:flex;flex-direction:column;align-items:center;gap:12px;padding:28px 12px;border:2px solid var(--border);border-radius:var(--radius);background:var(--card);color:var(--brand);font-size:18px;font-weight:600;cursor:pointer;transition:background .25s ease,color .25s ease,border-color .25s ease,transform .1s ease}.dv-tay-o:hover{border-color:var(--accent)}.dv-tay-o:active{transform:scale(.98)}.dv-tay-o:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.dv-tay-o.chon{background:var(--accent);border-color:var(--accent);color:#fff}.dv-tich{position:absolute;top:10px;right:12px;font-size:20px}.dv-lat{transform:scaleX(-1)}.dv-meo{margin:8px 0;padding-left:20px;color:var(--muted);line-height:1.7}.dv-hai-cot{display:grid;grid-template-columns:1fr;gap:20px;align-items:start}@media (min-width: 768px){.dv-hai-cot{grid-template-columns:1fr 1fr}}.dv-khung-tay{position:relative}.dv-khung-tay:after{content:"";position:absolute;top:12%;right:22%;bottom:12%;left:22%;border:2px dashed rgba(255,255,255,.8);border-radius:var(--radius);pointer-events:none}.dv-trang-thai{margin:10px 0;font-weight:600;color:var(--muted)}.dv-trang-thai.tot{color:var(--accent)}.dv-tien-do{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 24px;margin-bottom:16px}.dv-tu{font-size:26px;color:var(--accent)}.dv-day{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0 0 16px;padding:0}.dv-day li{min-width:40px;padding:6px 10px;border:1px solid var(--border);border-radius:var(--radius);text-align:center;font-size:20px;font-weight:600;color:var(--text);transition:background .2s ease,color .2s ease,opacity .2s ease}.dv-day li.dau{font-size:13px;align-self:center}.dv-day li.tieng-moi{margin-left:16px}.dv-day li.qua{opacity:.45}.dv-day li.dang{background:var(--accent);border-color:var(--accent);color:#fff}.dv-luyen{position:relative}.dv-luyen .dv-video,.dv-luyen .camera-khung{aspect-ratio:4 / 3}.dv-luyen .dv-video video,.dv-luyen .camera-hinh{width:100%;height:100%;object-fit:contain}@keyframes chuc-mung{0%{opacity:0;transform:translate(-50%,-40%) scale(.85)}15%{opacity:1;transform:translate(-50%,-50%) scale(1.04)}25%{transform:translate(-50%,-50%) scale(1)}85%{opacity:1}to{opacity:0;transform:translate(-50%,-55%)}}.dv-chuc-mung{position:absolute;left:50%;top:50%;z-index:2;transform:translate(-50%,-50%);display:flex;flex-direction:column;align-items:center;gap:4px;padding:20px 32px;border-radius:var(--radius);background:var(--card);box-shadow:var(--shadow);border:2px solid var(--accent);text-align:center;pointer-events:none;animation:chuc-mung 1.8s ease-out forwards}.dv-chuc-mung strong{font-size:22px;color:var(--accent)}.dv-video{position:relative;border-radius:var(--radius);overflow:hidden;background:var(--viewer-bg)}.dv-video video{display:block;width:100%;height:auto}.dv-video .error-banner,.dv-video .btn,.dv-video .empty-text{margin:12px}.dv-toc{position:absolute;top:8px;right:8px;padding:2px 8px;border-radius:999px;background:#0f172a99;color:#fff;font-size:12px}.dv-thieu{padding:40px 16px;text-align:center}.dv-dieu-khien{flex-wrap:wrap}.ico{display:inline-block;vertical-align:-.18em;flex:none}.stars{display:inline-flex;gap:2px;vertical-align:middle;color:#b45309}.skeleton-list{display:grid;gap:12px}.skeleton{background:var(--border);border-radius:var(--radius);animation:skeleton-pulse 1.4s ease-in-out infinite}@keyframes skeleton-pulse{50%{opacity:.55}}@media (prefers-reduced-motion: reduce){.skeleton{animation:none}}@media (max-width: 767px){.navbar{position:static;gap:6px 10px;padding:8px 12px}.navbar .brand{order:1;font-size:17px}.navbar .auth-slot,.navbar>.btn-primary{order:2;margin-left:auto;min-width:0;gap:6px;flex-wrap:wrap}.navbar>.btn-primary{padding:7px 14px}.navbar nav{order:3;flex:1 0 100%;margin-left:0;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none}.navbar nav::-webkit-scrollbar{display:none}.page{padding:8px 12px 32px}.translate-grid{gap:8px}.col-toolbar{min-height:0}.input-area{min-height:96px}.input-footer{margin-top:8px}.quick-words{flex-wrap:nowrap;overflow-x:auto;margin-top:10px;scrollbar-width:none}.quick-words button{flex:none}.translate-col .viewer-stage{height:min(260px,32vh)}.translate-col .card{padding:12px}.viewer-header{margin-bottom:8px}.viewer-header .card-title{font-size:15px}.col-toolbar{gap:6px}.col-toolbar .btn-ghost{padding:6px 10px;font-size:12px}.toolbar-dialect{font-size:13px}.player-controls{margin-top:8px;padding:8px 10px;gap:8px}.card.dv{padding:12px}.dv-quay-ve{margin-bottom:8px}.dv .card-title{margin-bottom:8px;font-size:18px}.dv-tien-do{gap:2px 12px;margin-bottom:8px;font-size:13px}.dv-tu{font-size:22px}.dv-day{gap:6px;margin-bottom:8px}.dv-day li{min-width:32px;padding:3px 8px;font-size:17px}.dv-day li.tieng-moi{margin-left:8px}.dv-luyen.dv-hai-cot{grid-template-columns:1fr;gap:8px}.dv-luyen .dv-video,.dv-luyen .camera-khung{width:min(100%,calc(26vh * 4 / 3));margin:0 auto}.dv-luyen .camera-thanh{width:min(100%,calc(26vh * 4 / 3));margin-left:auto;margin-right:auto}.dv-trang-thai{margin:6px 0;font-size:13px}.dv-dieu-khien{position:sticky;bottom:0;z-index:3;margin:8px -12px -12px;padding:8px 12px;gap:6px;flex-wrap:nowrap;background:var(--card);border-top:1px solid var(--border)}.dv-dieu-khien .btn{flex:1;padding:8px 6px;font-size:13px;white-space:nowrap}}
