:root{--bg-base:#0a0b0d;--bg-sidebar:#111216;--bg-surface:#171921;--bg-surface-hover:#20232e;--bg-item-selected:#1b263b;--border-color:#242838;--text-primary:#f3f4f6;--text-secondary:#a0aec0;--text-muted:#657187;--accent:#3b82f6;--accent-hover:#2563eb;--danger:#ef4444;--danger-hover:#dc2626;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -1px #0000000f;--shadow-lg:0 10px 15px -3px #0000004d, 0 4px 6px -2px #0000001a}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-base);color:var(--text-primary);font-family:Outfit,Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;line-height:1.5;overflow:hidden}.container{background-color:var(--bg-base);height:100vh;display:flex}.sidebar{background-color:var(--bg-sidebar);border-right:1px solid var(--border-color);flex-direction:column;flex-shrink:0;width:300px;display:flex;overflow:hidden}.sidebar-header{border-bottom:1px solid var(--border-color);color:var(--text-primary);letter-spacing:.5px;text-transform:uppercase;padding:20px 24px;font-size:15px;font-weight:700}.song-list{flex-direction:column;flex:1;gap:6px;padding:12px;display:flex;overflow-y:auto}.song-item{cursor:pointer;-webkit-user-select:none;user-select:none;background-color:#0000;border:1px solid #0000;border-radius:8px;justify-content:space-between;align-items:center;padding:12px 14px;transition:all .2s cubic-bezier(.4,0,.2,1);display:flex}.song-item:hover{background-color:var(--bg-surface);border-color:var(--border-color)}.song-item.selected{background-color:var(--bg-item-selected);border-color:#3b82f64d;box-shadow:0 0 12px #3b82f61a}.song-item.selected .song-title{color:#60a5fa;font-weight:600}.song-info{flex:1;min-width:0}.song-title{color:var(--text-primary);white-space:nowrap;text-overflow:ellipsis;margin-bottom:4px;font-size:14px;font-weight:500;overflow:hidden}.song-vocalists{flex-wrap:wrap;gap:4px;display:flex}.vocalist-tag{border:1px solid #0000;border-radius:10px;padding:1px 7px;font-size:10px;font-weight:600;display:inline-block}.vocalist-green{color:#34d399;background-color:#10b98126;border-color:#10b9814d}.vocalist-yellow{color:#fbbf24;background-color:#f59e0b26;border-color:#f59e0b4d}.vocalist-blue{color:#60a5fa;background-color:#3b82f626;border-color:#3b82f64d}.vocalist-gray{color:#d1d5db;background-color:#9ca3af26;border-color:#9ca3af4d}.btn-song-delete{color:var(--text-muted);cursor:pointer;opacity:0;background:0 0;border:none;border-radius:4px;justify-content:center;align-items:center;margin-left:8px;padding:4px;transition:all .2s;display:flex}.song-item:hover .btn-song-delete{opacity:1}.btn-song-delete:hover{color:var(--danger);background-color:#ef44441a}.sidebar-footer{border-top:1px solid var(--border-color);background-color:var(--bg-sidebar);padding:16px}.btn-primary{background-color:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:8px;justify-content:center;align-items:center;gap:6px;width:100%;padding:11px;font-size:13px;font-weight:600;transition:all .2s;display:flex;box-shadow:0 4px 6px -1px #3b82f626}.btn-primary:hover{background-color:var(--accent-hover);transform:translateY(-1px);box-shadow:0 6px 8px -1px #3b82f640}.btn-primary:active{transform:translateY(0)}.main-content{background-color:var(--bg-base);flex-direction:column;flex:1;display:flex;overflow:hidden}.content-header{border-bottom:1px solid var(--border-color);background-color:var(--bg-sidebar);padding:20px 24px}.content-header h2{color:var(--text-primary);font-size:18px;font-weight:700}.content-body{flex-direction:column;flex:1;padding:24px;display:flex;overflow:hidden}.empty-state{height:100%;color:var(--text-secondary);text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:16px;font-size:14px;display:flex}.empty-state svg{color:var(--text-muted);opacity:.6}.reference-section{flex-direction:column;gap:16px;height:100%;display:flex;overflow:hidden}.reference-header{justify-content:space-between;align-items:center;display:flex}.reference-header h3{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;font-size:13px;font-weight:600}.btn-secondary{background-color:var(--bg-surface);color:var(--text-primary);border:1px solid var(--border-color);cursor:pointer;border-radius:6px;align-items:center;gap:6px;padding:8px 14px;font-size:12px;font-weight:600;transition:all .2s;display:flex}.btn-secondary:hover{background-color:var(--bg-surface-hover);border-color:var(--text-secondary)}.reference-list{flex-direction:column;flex:1;gap:8px;min-height:120px;padding-right:4px;display:flex;overflow-y:auto}.reference-item{background-color:var(--bg-surface);border:1px solid var(--border-color);cursor:grab;-webkit-user-select:none;user-select:none;border-radius:8px;align-items:center;gap:12px;padding:10px 14px;transition:all .2s cubic-bezier(.4,0,.2,1);display:flex}.reference-item:hover{background-color:var(--bg-surface-hover);border-color:#3b82f633;transform:translate(1px)}.reference-item.selected{background-color:var(--bg-item-selected);border-color:#3b82f666}.reference-item.dragging{opacity:.4;background-color:#3b82f60d;border-style:dashed}.reference-item.drag-over{border:2px dashed var(--accent);background-color:#3b82f60d}.reference-item:active{cursor:grabbing}.drag-handle{color:var(--text-muted);cursor:grab;opacity:.6;align-items:center;transition:opacity .2s;display:flex}.reference-item:hover .drag-handle{opacity:1}.reference-thumbnail{width:72px;height:54px;color:var(--text-muted);border:1px solid var(--border-color);background-color:#121318;border-radius:4px;flex-shrink:0;justify-content:center;align-items:center;font-size:10px;display:flex}.reference-thumbnail-img{object-fit:cover;border-radius:4px;flex-shrink:0;width:72px;height:54px}.reference-info{flex:1;min-width:0}.reference-title{color:var(--text-primary);white-space:nowrap;text-overflow:ellipsis;margin-bottom:2px;font-size:13px;font-weight:600;overflow:hidden}.reference-channel{color:var(--text-secondary);white-space:nowrap;text-overflow:ellipsis;font-size:11px;overflow:hidden}.reference-actions{flex-shrink:0;gap:8px;display:flex}.btn-small{color:#fca5a5;cursor:pointer;background-color:#ef44441a;border:1px solid #ef444433;border-radius:6px;padding:6px 12px;font-size:12px;font-weight:600;transition:all .2s}.btn-small:hover{color:#ef4444;background-color:#ef444433;border-color:#ef444466}.player-section{background-color:var(--bg-sidebar);border:1px solid var(--border-color);max-width:580px;box-shadow:var(--shadow-lg);border-radius:10px;flex-direction:column;flex-shrink:0;gap:10px;padding:16px;display:flex}.player-header{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;align-items:center;gap:8px;font-size:12px;font-weight:700;display:flex}.player-header .live-badge{color:#fff;background-color:#10b981;border-radius:10px;padding:1px 5px;font-size:8px;animation:2s infinite pulse-glow}@keyframes pulse-glow{0%{opacity:.6}50%{opacity:1}to{opacity:.6}}.player-area{aspect-ratio:16/9;border:1px solid var(--border-color);background-color:#000;border-radius:6px;width:100%;position:relative;overflow:hidden}#ytPlayerContainer{width:100%;height:100%;position:absolute;top:0;left:0}.player-placeholder{color:var(--text-secondary);background-color:#121317;flex-direction:column;justify-content:center;align-items:center;gap:10px;font-size:13px;display:flex;position:absolute;inset:0}.player-placeholder svg{color:var(--text-muted)}.player-title{color:var(--accent);white-space:nowrap;text-overflow:ellipsis;margin-top:2px;font-size:13px;font-weight:600;overflow:hidden}.modal{-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);z-index:1000;opacity:0;background-color:#060709bf;justify-content:center;align-items:center;transition:opacity .2s;display:none;position:fixed;inset:0}.modal.active{opacity:1;display:flex}.modal-content{background-color:var(--bg-sidebar);border:1px solid var(--border-color);box-shadow:var(--shadow-lg);border-radius:12px;width:90%;max-width:400px;padding:24px;transition:transform .2s cubic-bezier(.34,1.56,.64,1);transform:translateY(12px)}.modal.active .modal-content{transform:translateY(0)}.modal-header{color:var(--text-primary);margin-bottom:16px;font-size:16px;font-weight:700}.form-group{margin-bottom:16px}.form-label{color:var(--text-secondary);margin-bottom:6px;font-size:12px;font-weight:600;display:block}.form-input{background-color:var(--bg-base);border:1px solid var(--border-color);width:100%;color:var(--text-primary);border-radius:6px;padding:10px 12px;font-family:inherit;font-size:13px;transition:all .2s}.form-input:focus{border-color:var(--accent);outline:none;box-shadow:0 0 0 3px #3b82f626}.form-input::placeholder{color:var(--text-muted)}.form-error{color:var(--danger);margin-top:4px;font-size:11px;display:none}.form-error.show{display:block}.modal-actions{justify-content:flex-end;gap:8px;margin-top:20px;display:flex}.btn-cancel{background-color:var(--bg-surface);color:var(--text-primary);border:1px solid var(--border-color);cursor:pointer;border-radius:6px;padding:9px 15px;font-size:12px;font-weight:600;transition:all .2s}.btn-cancel:hover{background-color:var(--bg-surface-hover)}.btn-confirm{background-color:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:6px;padding:9px 15px;font-size:12px;font-weight:600;transition:all .2s}.btn-confirm:hover{background-color:var(--accent-hover)}.btn-confirm:disabled{background-color:var(--border-color);color:var(--text-muted);cursor:not-allowed}.btn-danger{background-color:var(--danger)}.btn-danger:hover{background-color:var(--danger-hover)}.song-list::-webkit-scrollbar{width:5px}.reference-list::-webkit-scrollbar{width:5px}.song-list::-webkit-scrollbar-track{background:0 0}.reference-list::-webkit-scrollbar-track{background:0 0}.song-list::-webkit-scrollbar-thumb{background:#242838;border-radius:3px}.reference-list::-webkit-scrollbar-thumb{background:#242838;border-radius:3px}.song-list::-webkit-scrollbar-thumb:hover{background:#2f344a}.reference-list::-webkit-scrollbar-thumb:hover{background:#2f344a}