*,*:before,*:after{box-sizing:border-box}:root{--bg: #0a0f1a;--bg-1: #0e1524;--bg-2: #13192d;--surface: rgba(255, 255, 255, .04);--surface-hover: rgba(255, 255, 255, .07);--border: rgba(255, 255, 255, .08);--border-strong: rgba(255, 255, 255, .13);--text: #e8f0fd;--text-2: #8fa3c0;--text-3: #4f6580;--accent: #2dd4bf;--accent-bg: rgba(45, 212, 191, .08);--accent-border: rgba(45, 212, 191, .28);--warn: #f59e0b;--warn-bg: rgba(245, 158, 11, .08);--warn-border: rgba(245, 158, 11, .28);--danger: #f87171;--danger-bg: rgba(248, 113, 113, .08);--danger-border: rgba(248, 113, 113, .25);--sidebar-w: 380px;--header-h: 56px;--mobile-bar-h: 56px;--radius-xs: 6px;--radius-sm: 8px;--radius: 12px;--radius-lg: 16px}html,body,#root{height:100%;margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:Inter,Segoe UI,system-ui,-apple-system,sans-serif;font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;color-scheme:dark}h1,h2,h3,h4,p{margin:0;padding:0}h1,h2,h3,h4{line-height:1.2;letter-spacing:-.02em}button,input,select,textarea{font:inherit;color:inherit;margin:0}button{cursor:pointer;border:none;background:none;padding:0}.app,.admin-app{display:flex;flex-direction:column;height:100%;overflow:hidden}.app-header{height:var(--header-h);min-height:var(--header-h);flex-shrink:0;display:flex;align-items:center;gap:16px;padding:0 16px;border-bottom:1px solid var(--border);background:#0a0f1af5;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);z-index:100}.brand{display:flex;align-items:center;gap:8px;flex-shrink:0;text-decoration:none}.brand-icon{width:32px;height:32px;background:var(--accent);color:#051a18;border-radius:var(--radius-sm);display:grid;place-items:center;font-size:17px;font-weight:900;flex-shrink:0}.brand-name{font-size:17px;font-weight:800;color:var(--text);letter-spacing:-.03em}.admin-badge{padding:2px 7px;border-radius:var(--radius-xs);background:var(--warn-bg);border:1px solid var(--warn-border);color:var(--warn);font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.09em}.now-playing{flex:1;min-width:0;display:flex;flex-direction:column;align-items:center;gap:1px}.now-playing-title{font-size:13px;font-weight:700;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%}.now-playing-artist{font-size:11px;color:var(--text-2);white-space:nowrap}.header-actions{display:flex;align-items:center;gap:8px;margin-left:auto;flex-shrink:0}.btn-ghost{padding:6px 12px;border-radius:var(--radius-sm);border:1px solid var(--border-strong);background:var(--surface);color:var(--text-2);font-size:13px;font-weight:600;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;gap:6px;transition:all .13s ease;white-space:nowrap}.btn-ghost:hover{border-color:var(--accent-border);color:var(--accent);background:var(--accent-bg)}.study-layout{flex:1;display:grid;grid-template-columns:var(--sidebar-w) 1fr;overflow:hidden;min-height:0}.library-sidebar{border-right:1px solid var(--border);display:flex;flex-direction:column;overflow:hidden;background:var(--bg-1)}.library-header,.admin-sidebar-header{padding:14px 16px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;flex-shrink:0;gap:10px}.sidebar-title{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:var(--text-2)}.count-badge{font-size:11px;font-weight:700;color:var(--accent);background:var(--accent-bg);border:1px solid var(--accent-border);border-radius:999px;padding:1px 7px;flex-shrink:0}.library-filters{padding:12px;border-bottom:1px solid var(--border);display:flex;flex-direction:column;gap:8px;background:#0a0f1a33;flex-shrink:0}.search-wrapper{position:relative;width:100%}.filter-search-input{width:100%;padding:8px 32px 8px 12px;border-radius:var(--radius-sm);border:1px solid 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ease;text-overflow:ellipsis;white-space:nowrap}.filter-select:focus,.filter-select:hover{border-color:var(--accent-border);color:var(--text);background:#050a14b3}.filter-select option{background:var(--bg-1);color:var(--text)}.filter-select-full{grid-column:1 / -1}.empty-filter-results{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px 16px;text-align:center;color:var(--text-2);gap:10px}.empty-filter-icon{font-size:24px}.empty-filter-results p{font-size:13px;margin:0;color:var(--text-3)}.btn-reset-filters{font-size:11px;font-weight:700;color:var(--accent);background:var(--accent-bg);border:1px solid var(--accent-border);border-radius:var(--radius-xs);padding:5px 12px;cursor:pointer;transition:all .11s 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.song-item-cover{border-color:var(--accent-border);background:var(--accent-bg);color:var(--accent)}.song-item-info{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px}.song-item-title{font-size:13px;font-weight:700;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.song-item.active .song-item-title{color:var(--accent)}.song-item-artist{font-size:12px;color:var(--text-2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.song-item-tags{display:flex;gap:4px;flex-wrap:wrap;margin-top:2px}.tag{font-size:10px;font-weight:600;padding:1px 5px;border-radius:4px;background:var(--surface);color:var(--text-3);border:1px solid var(--border);text-transform:lowercase}.flex-tag{display:inline-flex;align-items:center;gap:3px}.tag-beginner{color:#4ade80;border-color:#4ade8040;background:#4ade800f}.tag-intermediate{color:#fb923c;border-color:#fb923c40;background:#fb923c0f}.tag-advanced{color:#f87171;border-color:#f8717140;background:#f871710f}.tag-type-music{color:#a78bfa;border-color:#a78bfa40;background:#a78bfa12}.tag-type-movie{color:#38bdf8;border-color:#38bdf840;background:#38bdf812}.tag-type-series{color:#fb923c;border-color:#fb923c40;background:#fb923c12}.tag-type-documentary{color:#34d399;border-color:#34d39940;background:#34d39912}.study-main{display:grid;grid-template-columns:1fr 540px;grid-template-rows:auto auto 1fr;overflow:hidden;min-height:0}.player-container{grid-column:2;grid-row:1 / span 2;padding:16px 20px 12px;border-left:1px solid var(--border);border-bottom:1px solid var(--border)}.youtube-frame{width:100%}.youtube-container{position:relative;width:100%!important;max-width:720px;aspect-ratio:16 / 9!important;height:auto!important;margin:0 auto}.youtube-container iframe{position:absolute;top:0;left:0;width:100%!important;height:100%!important}.active-lyric{grid-column:1;grid-row:1;position:relative;padding:18px 20px;min-height:80px;display:flex;flex-direction:column;justify-content:center;gap:5px;border-bottom:1px solid var(--border);background:linear-gradient(180deg,rgba(45,212,191,.03) 0%,transparent 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13px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border);display:flex;flex-direction:column;gap:7px}.note-label{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:var(--text-3)}.note-card p{font-size:13px;color:var(--text-2);line-height:1.5}.vocab-chips{display:flex;flex-wrap:wrap;gap:5px}.vocab-chip{padding:3px 9px;border-radius:999px;background:var(--accent-bg);border:1px solid var(--accent-border);color:var(--accent);font-size:12px;font-weight:600}.vocab-card.is-empty .vocab-chips{visibility:hidden}.empty-study{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;padding:40px 24px;text-align:center;color:var(--text-2)}.empty-icon{font-size:44px;margin-bottom:4px}.empty-study h2{font-size:1.35rem;color:var(--text)}.empty-study p{font-size:14px;max-width:30ch;color:var(--text-2)}.empty-hint{padding:20px;color:var(--text-3);font-size:13px;text-align:center;font-style:italic}.btn-primary{padding:10px 20px;border-radius:var(--radius);background:var(--accent);color:#051a18;font-size:14px;font-weight:700;border:none;cursor:pointer;transition:opacity .13s ease}.btn-primary:hover{opacity:.85}.loading-screen{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;color:var(--text-2);font-size:14px}.loading-spinner{width:30px;height:30px;border:3px solid var(--border-strong);border-top-color:var(--accent);border-radius:50%;animation:spin .75s linear infinite}.error-text{color:var(--danger);font-weight:700}.mobile-bottom-bar{display:none;height:var(--mobile-bar-h);min-height:var(--mobile-bar-h);flex-shrink:0;border-top:1px solid var(--border);background:var(--bg-1);align-items:center;padding:0 14px;gap:12px;z-index:90}.mobile-tab{padding:8px 16px;border-radius:var(--radius-sm);border:1px solid var(--border-strong);background:var(--surface);color:var(--text-2);font-size:13px;font-weight:600;cursor:pointer;transition:all .11s ease;flex-shrink:0}.mobile-tab.active{background:var(--accent-bg);border-color:var(--accent-border);color:var(--accent)}.mobile-now-playing{flex:1;min-width:0;font-size:13px;font-weight:600;color:var(--text-2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;text-align:right}.admin-layout{flex:1;display:grid;grid-template-columns:var(--sidebar-w) 1fr;overflow:hidden;min-height:0}.admin-sidebar{border-right:1px solid var(--border);overflow:hidden;background:var(--bg-1);display:flex;flex-direction:column}.admin-content{display:flex;flex-direction:column;overflow:hidden;min-height:0;padding:0}.admin-section{display:flex;flex-direction:column;gap:16px}.admin-section-header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-bottom:14px;border-bottom:1px solid var(--border)}.admin-section-title{font-size:15px;font-weight:700;color:var(--text)}.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.form-row-full{grid-column:1 / -1}.form-field{display:flex;flex-direction:column;gap:5px}.form-label{font-size:11px;font-weight:700;color:var(--text-2);text-transform:uppercase;letter-spacing:.08em}.form-input{padding:8px 11px;border-radius:var(--radius-sm);border:1px solid var(--border-strong);background:#050a14b3;color:var(--text);font-size:13px;outline:none;transition:border-color .11s ease,box-shadow .11s ease;width:100%}.form-input:focus{border-color:var(--accent-border);box-shadow:0 0 0 3px var(--accent-bg)}.form-input::placeholder{color:var(--text-3)}textarea.form-input{min-height:72px;resize:vertical;line-height:1.5}.checkbox-group{display:flex;flex-direction:column;gap:8px;padding-top:4px}.checkbox-field{display:flex;align-items:center;gap:8px;cursor:pointer;font-size:13px;color:var(--text-2)}.checkbox-field input[type=checkbox]{width:15px;height:15px;accent-color:var(--accent);cursor:pointer;flex-shrink:0}.upload-area{gap:7px}.upload-hint{font-size:12px;color:var(--text-3)}.admin-actions{display:flex;gap:8px;flex-wrap:nowrap;align-items:center}.admin-actions .btn-save,.admin-actions .btn-danger{flex:1;text-align:center;padding:8px 10px;font-size:12px;white-space:nowrap}.admin-message{padding:10px 13px;border-radius:var(--radius-sm);background:var(--accent-bg);border:1px solid var(--accent-border);color:var(--accent);font-size:13px}.admin-message.error{background:var(--danger-bg);border-color:var(--danger-border);color:var(--danger)}.btn-save{padding:9px 18px;border-radius:var(--radius-sm);background:var(--accent);color:#051a18;font-size:13px;font-weight:700;border:none;cursor:pointer;transition:opacity .11s ease}.btn-save:disabled{opacity:.45;cursor:not-allowed}.btn-save:not(:disabled):hover{opacity:.85}.btn-danger{padding:9px 18px;border-radius:var(--radius-sm);background:var(--danger-bg);border:1px solid var(--danger-border);color:var(--danger);font-size:13px;font-weight:700;cursor:pointer;transition:all .11s ease}.btn-danger:disabled{opacity:.45;cursor:not-allowed}.btn-danger:not(:disabled):hover{background:#f8717126}.btn-secondary{padding:8px 16px;border-radius:var(--radius-sm);background:var(--surface);border:1px solid var(--border-strong);color:var(--text-2);font-size:13px;font-weight:600;cursor:pointer;transition:all .11s ease;white-space:nowrap}.btn-secondary:hover{background:var(--surface-hover);color:var(--text)}.lyrics-editor{display:flex;flex-direction:column;gap:8px}.lyric-editor-row{padding:12px 14px;border-radius:var(--radius);border:1px solid var(--border);background:var(--surface);display:flex;flex-direction:column;gap:10px}.lyric-editor-grid{display:flex;flex-direction:column;gap:10px}.lyric-editor-time-row{display:grid;grid-template-columns:1fr auto 1fr;gap:8px;align-items:end}.lyric-editor-time-arrow{font-size:14px;color:var(--text-3);padding-bottom:9px;text-align:center}.lyric-time-field{display:flex;flex-direction:column;gap:4px}.lyric-time-header{display:flex;justify-content:space-between;align-items:center}.lyric-time-display{font-size:10px;font-family:monospace;color:var(--accent);font-weight:700;letter-spacing:.03em}.btn-capture-time{display:inline-flex;align-items:center;gap:4px;padding:4px 9px;border-radius:var(--radius-xs);border:1px solid var(--accent-border);background:var(--accent-bg);color:var(--accent);font-size:11px;font-weight:700;cursor:pointer;letter-spacing:.03em;transition:all .11s ease;white-space:nowrap}.btn-capture-time:hover{background:var(--accent);color:#051a18;border-color:var(--accent)}.lyric-time-input-row{display:flex;gap:6px;align-items:stretch}.lyric-time-input-row .form-input{flex:1;min-width:0;font-family:monospace;font-size:13px}.lyric-editor-texts{display:grid;grid-template-columns:1fr 1fr;gap:10px}.lyric-editor-texts .form-input{min-height:64px;resize:vertical;font-size:14px;line-height:1.5;padding:9px 11px}.lyric-editor-note-section{display:flex;flex-direction:column;gap:4px}.lyric-editor-note-section .form-input{min-height:44px;font-size:12px;color:var(--text-2);resize:vertical}.lyric-editor-note{grid-column:1 / -1}.lyric-remove{align-self:flex-start;padding:5px 11px;border-radius:var(--radius-sm);border:1px solid var(--danger-border);background:var(--danger-bg);color:var(--danger);font-size:12px;font-weight:600;cursor:pointer;transition:all .11s ease}.lyric-remove:hover{background:#f8717126}.lyrics-add-btn{padding:10px;border-radius:var(--radius-sm);border:1px dashed var(--border-strong);background:transparent;color:var(--text-2);font-size:13px;font-weight:600;cursor:pointer;transition:all .11s ease;text-align:center}.lyrics-add-btn:hover{border-color:var(--accent-border);color:var(--accent);background:var(--accent-bg)}.lyric-editor-row.is-active{border-color:var(--warn-border);background:var(--warn-bg);box-shadow:0 0 0 1px var(--warn-border)}.lyric-editor-row.is-active .form-label{color:var(--warn)}.lyric-editor-row-actions{display:flex;align-items:center;gap:6px;flex-wrap:wrap}.btn-move{padding:4px 8px;border-radius:var(--radius-xs);border:1px solid var(--border-strong);background:var(--surface);color:var(--text-2);font-size:12px;cursor:pointer;transition:all .11s ease;line-height:1}.btn-move:hover:not(:disabled){background:var(--surface-hover);color:var(--text);border-color:var(--accent-border)}.btn-move:disabled{opacity:.3;cursor:not-allowed}.lyric-editor-row-index{font-size:11px;font-weight:700;color:var(--text-3);min-width:18px;flex-shrink:0}.admin-editor-layout{display:grid;grid-template-columns:1fr 340px;gap:24px;align-items:start;flex:1;overflow:hidden;min-height:0;padding:20px}.admin-editor-main{display:flex;flex-direction:column;gap:28px;min-width:0;overflow-y:auto;padding-right:4px;max-height:calc(100vh - var(--header-h) - 40px)}.admin-editor-preview{position:sticky;top:24px;background:var(--bg-2);border:1px solid var(--border);border-radius:var(--radius-lg);padding:14px;display:flex;flex-direction:column;gap:10px;box-shadow:0 10px 15px -3px #0000004d}.admin-preview-player-wrap{border-radius:var(--radius-sm);overflow:hidden;background:#000;max-height:200px;display:flex;align-items:center;justify-content:center}.admin-preview-player-wrap .youtube-frame{width:100%}.admin-preview-player-wrap .youtube-container{max-width:100%;aspect-ratio:16 / 9;max-height:196px}.admin-preview-player-wrap audio{width:100%;margin:0}.admin-preview-title{font-size:14px;font-weight:700;color:var(--text);margin-bottom:2px;display:flex;align-items:center;gap:8px}.empty-audio-preview{padding:40px 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