.timeline-panel {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 180px;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(20px);
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 2100;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.timeline-panel.collapsed {
    height: 44px;
}

.timeline-panel.collapsed .timeline-content {
    display: none;
}

.timeline-panel.collapsed #toggle-timeline svg {
    transform: rotate(180deg);
}

.timeline-header {
    height: 44px;
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
}

.timeline-controls {
    display: flex;
    align-items: center;
    gap: 12px;
}

.control-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6px;
    border-radius: 6px;
    transition: all 0.2s;
}

.control-btn:hover {
    color: white;
    background: rgba(255, 255, 255, 0.1);
}

.control-btn.active {
    color: var(--primary-color);
}

.timeline-timecode {
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
    color: var(--text-color);
    background: rgba(0, 0, 0, 0.2);
    padding: 2px 8px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.time-main { color: var(--primary-color); font-weight: 600; width: 50px; text-align: right; }
.time-divider { opacity: 0.3; }
.time-duration { 
    background: transparent; border: none; color: var(--text-muted);
    width: 45px; font-family: inherit; font-size: inherit; outline: none;
}

.timeline-toolbar {
    display: flex;
    align-items: center;
    gap: 16px;
}

.btn-kf {
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 4px 10px;
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 4px;
    opacity: 0.8;
    transition: opacity 0.2s;
}

.btn-kf:hover { opacity: 1; }

.loop-control {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    color: var(--text-muted);
    cursor: pointer;
}

.timeline-content {
    flex: 1;
    display: flex;
    overflow: hidden;
}

.timeline-labels {
    width: 180px;
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    background: rgba(0,0,0,0.1);
}

.track-label {
    height: 32px;
    display: flex;
    align-items: center;
    padding: 0 12px;
    font-size: 0.75rem;
    color: var(--text-muted);
    border-bottom: 1px solid rgba(255,255,255,0.03);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.track-label.selected {
    background: rgba(99, 102, 241, 0.1);
    color: white;
}

.timeline-scroll-container {
    flex: 1;
    overflow: auto;
    position: relative;
    background: 
        repeating-linear-gradient(90deg, transparent, transparent 49px, rgba(255,255,255,0.03) 50px);
}

.timeline-grid-wrapper {
    position: relative;
    min-width: 1000px;
    height: 100%;
}

.timeline-ruler {
    height: 24px;
    border-bottom: 1px solid var(--border-color);
    position: relative;
    background: rgba(0,0,0,0.1);
}

.ruler-tick {
    position: absolute;
    bottom: 0;
    width: 1px;
    height: 4px;
    background: rgba(255, 255, 255, 0.2);
}

.ruler-time {
    position: absolute;
    top: 2px;
    font-size: 0.65rem;
    color: var(--text-muted);
    transform: translateX(-50%);
}

.timeline-tracks {
    position: relative;
}

.timeline-track {
    height: 32px;
    border-bottom: 1px solid rgba(255,255,255,0.03);
    position: relative;
}

.timeline-track.selected {
    background: rgba(99, 102, 241, 0.05);
}

.keyframe {
    position: absolute;
    top: 50%;
    width: 8px;
    height: 8px;
    background: var(--primary-color);
    border: 2px solid #fff;
    transform: translate(-50%, -50%) rotate(45deg);
    cursor: pointer;
    z-index: 5;
    transition: transform 0.1s;
}

.keyframe:hover {
    transform: translate(-50%, -50%) rotate(45deg) scale(1.3);
}

.keyframe.selected {
    background: #fff;
    border-color: #ff3e00;
    box-shadow: 0 0 10px var(--primary-color);
}

.timeline-cursor {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 2px;
    background: #ff3e00;
    z-index: 100;
    pointer-events: none;
}

.cursor-head {
    width: 12px;
    height: 16px;
    background: #ff3e00;
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    clip-path: polygon(0% 0%, 100% 0%, 100% 70%, 50% 100%, 0% 70%);
}