*,*: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: 272px;--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}.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}.song-list{flex:1;overflow-y:auto;padding:8px;display:flex;flex-direction:column;gap:2px}.song-item{width:100%;display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:var(--radius);border:1px solid transparent;background:transparent;text-align:left;transition:all .11s ease;cursor:pointer}.song-item:hover{background:var(--surface-hover);border-color:var(--border)}.song-item.active{background:var(--accent-bg);border-color:var(--accent-border)}.song-item-cover{width:38px;height:38px;flex-shrink:0;background:var(--bg-2);border-radius:var(--radius-sm);display:grid;place-items:center;font-size:16px;border:1px solid var(--border);color:var(--text-3)}.song-item.active .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}.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}.study-main{display:flex;flex-direction:column;overflow:hidden;min-height:0}.player-container{padding:16px 20px 12px;flex-shrink:0;border-bottom:1px solid var(--border)}.youtube-frame{width:100%}.youtube-container{position:relative;width:100%;aspect-ratio:16 / 9}.youtube-container iframe{position:absolute;top:0;left:0;width:100%!important;height:100%!important}.active-lyric{padding:18px 20px;min-height:80px;display:flex;flex-direction:column;justify-content:center;gap:5px;border-bottom:1px solid var(--border);flex-shrink:0;background:linear-gradient(180deg,rgba(45,212,191,.03) 0%,transparent 100%)}.active-lyric-en{font-size:clamp(1.15rem,2.2vw,1.65rem);font-weight:800;line-height:1.25;color:var(--text);letter-spacing:-.02em}.active-lyric-pt{font-size:clamp(.9rem,1.6vw,1.1rem);color:var(--text-2);line-height:1.4;font-weight:500}.active-lyric-placeholder{color:var(--text-3);font-size:.95rem;font-style:italic}.study-controls{padding:10px 16px;display:flex;flex-wrap:wrap;gap:7px;border-bottom:1px solid var(--border);flex-shrink:0;align-items:center}.ctrl-btn{padding:6px 13px;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;white-space:nowrap}.ctrl-btn:hover{background:var(--surface-hover);color:var(--text)}.ctrl-btn.active{background:var(--warn-bg);border-color:var(--warn-border);color:var(--warn)}.lyrics-scroll{flex:1;overflow-y:auto;padding:10px 12px;display:flex;flex-direction:column;gap:3px}.lyric-row{display:flex;gap:12px;padding:9px 11px;border-radius:var(--radius);border:1px solid transparent;cursor:pointer;transition:all .11s ease;opacity:.45;align-items:flex-start}.lyric-row:hover{background:var(--surface);opacity:.75}.lyric-row.active{background:var(--warn-bg);border-color:var(--warn-border);opacity:1}.lyric-time{flex-shrink:0;font-size:11px;font-weight:700;color:var(--text-3);font-variant-numeric:tabular-nums;padding-top:3px;min-width:34px;letter-spacing:.02em}.lyric-row.active .lyric-time{color:var(--warn)}.lyric-content{flex:1;display:flex;flex-direction:column;gap:2px}.lyric-en{font-size:14px;font-weight:700;color:var(--text);line-height:1.35}.lyric-row.active .lyric-en{font-size:14px;color:#fff}.lyric-pt{font-size:12px;color:var(--text-2);line-height:1.4}.study-notes{padding:10px 12px 12px;display:flex;gap:10px;flex-wrap:wrap;border-top:1px solid var(--border);flex-shrink:0}.note-card,.vocab-card{flex:1;min-width:180px;padding:11px 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}.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}@keyframes spin{to{transform:rotate(360deg)}}.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{overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:28px}.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:10px;flex-wrap:wrap}.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}.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-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:grid;grid-template-columns:100px 100px 1fr 1fr;gap:10px;align-items:start}.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)}audio{width:100%;accent-color:var(--accent);border-radius:var(--radius-sm)}@media(max-width:768px){.study-layout{grid-template-columns:1fr;position:relative}.library-sidebar{display:none;position:fixed;top:var(--header-h);left:0;right:0;bottom:var(--mobile-bar-h);z-index:50;background:var(--bg-1);border-right:none}.library-open .library-sidebar,.mobile-bottom-bar{display:flex}.now-playing{display:none}.study-main{overflow-y:auto}.lyrics-scroll{overflow:visible;flex:none;min-height:200px}.study-notes{flex-direction:column}.note-card,.vocab-card{min-width:auto}.player-container{padding:12px 14px 10px}.active-lyric{padding:14px;min-height:70px}.active-lyric-en{font-size:1.15rem}.active-lyric-pt{font-size:.9rem}.admin-layout{grid-template-columns:1fr;overflow-y:auto}.admin-sidebar{border-right:none;border-bottom:1px solid var(--border);max-height:220px;overflow-y:auto;flex-shrink:0}.admin-content{padding:14px}.form-grid{grid-template-columns:1fr}.lyric-editor-grid{grid-template-columns:1fr 1fr}.lyric-editor-note{grid-column:1 / -1}}@media(min-width:769px){.mobile-bottom-bar{display:none}}@media(max-width:480px){.study-controls{gap:6px}.ctrl-btn{font-size:12px;padding:6px 10px}.brand-name{font-size:15px}}