/* Timeline panel */
.timeline-panel {
    grid-area: timeline;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    z-index: 10;
    overflow: hidden;
}

.timeline-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    border-bottom: 1px solid var(--border-subtle);
    flex-shrink: 0;
    min-height: var(--timeline-collapsed);
}

.timeline-toggle {
    width: 20px;
    height: 20px;
    border: none;
    background: transparent;
    color: var(--text-tertiary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-xs);
    transition: all var(--dur-fast);
}
.timeline-toggle:hover { color: var(--text-secondary); background: var(--bg-hover); }
.timeline-toggle svg { width: 12px; height: 12px; transition: transform var(--dur-normal); }
.timeline-collapsed .timeline-toggle svg { transform: rotate(180deg); }

.timeline-title {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-tertiary);
}

.timeline-duration {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 6px;
}
.timeline-duration label {
    font-size: 10px;
    color: var(--text-tertiary);
}
.timeline-duration input {
    width: 50px;
    padding: 3px 6px;
    background: var(--bg-input);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xs);
    color: var(--text-primary);
    font-size: 11px;
    font-family: var(--font-mono);
    text-align: center;
}

/* Timeline body */
.timeline-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: auto;
    position: relative;
}

.timeline-labels {
    width: 120px;
    flex-shrink: 0;
    border-right: 1px solid var(--border-subtle);
    overflow-y: auto;
    padding-top: 24px;
}

.timeline-label {
    height: 28px;
    display: flex;
    align-items: center;
    padding: 0 12px;
    font-size: 10px;
    color: var(--text-tertiary);
    border-bottom: 1px solid var(--border-subtle);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.timeline-label.active { color: var(--accent-hover); }

.timeline-tracks-wrap {
    flex: 1;
    position: relative;
    overflow: auto;
}

/* Time ruler */
.timeline-ruler {
    height: 24px;
    position: sticky;
    top: 0;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-default);
    z-index: 5;
    cursor: pointer;
}
.timeline-ruler canvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* Tracks area */
.timeline-tracks {
    position: relative;
    min-height: 100%;
}

.timeline-track {
    height: 28px;
    position: relative;
    border-bottom: 1px solid var(--border-subtle);
}
.timeline-track:hover { background: rgba(255,255,255,0.02); }

/* Keyframe diamond */
.keyframe {
    position: absolute;
    width: 10px;
    height: 10px;
    background: var(--accent);
    transform: rotate(45deg) translate(-50%, -50%);
    top: 50%;
    cursor: pointer;
    border: 1px solid var(--accent-hover);
    transition: all var(--dur-fast);
    z-index: 3;
}
.keyframe:hover {
    transform: rotate(45deg) translate(-50%, -50%) scale(1.3);
    box-shadow: 0 0 8px var(--accent-glow);
}
.keyframe.selected {
    background: var(--accent-hover);
    box-shadow: 0 0 12px var(--accent-strong);
}

/* Playhead */
.timeline-playhead {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--error);
    z-index: 10;
    pointer-events: none;
}
.timeline-playhead::before {
    content: "";
    position: absolute;
    top: 0;
    left: -4px;
    width: 10px;
    height: 10px;
    background: var(--error);
    border-radius: 50% 50% 50% 0;
    transform: rotate(-45deg);
}

/* Keyframe diamond (used by timeline-ui.js) */
.keyframe-diamond {
    position: absolute;
    width: 10px;
    height: 10px;
    background: var(--accent);
    transform: rotate(45deg) translateY(-50%);
    top: 50%;
    cursor: pointer;
    border: 1px solid var(--accent-hover);
    transition: all var(--dur-fast);
    z-index: 3;
}
.keyframe-diamond:hover {
    transform: rotate(45deg) translateY(-50%) scale(1.3);
    box-shadow: 0 0 8px var(--accent-glow);
}

/* Ruler marks */
.ruler-mark {
    position: absolute;
    top: 0;
    height: 100%;
    border-left: 1px solid var(--border-subtle);
}
.ruler-mark.minor { border-left: 1px solid rgba(255,255,255,0.03); }
.ruler-label {
    font-size: 9px;
    color: var(--text-tertiary);
    padding: 4px;
    font-family: var(--font-mono);
}

/* Track labels inside tracks */
.track-label {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 80px;
    display: flex;
    align-items: center;
    padding: 0 8px;
    font-size: 10px;
    color: var(--text-tertiary);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-subtle);
    z-index: 2;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.track-bar {
    position: absolute;
    left: 80px;
    right: 0;
    top: 0;
    bottom: 0;
}

.timeline-track.selected { background: rgba(124,106,239,0.05); }
.timeline-track.selected .track-label { color: var(--accent-hover); }

.timeline-bar {
    position: relative;
    min-width: 100%;
    min-height: 100%;
}

/* Timeline controls */
.timeline-controls {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 8px;
}
.timeline-dur-label {
    font-size: 10px;
    color: var(--text-tertiary);
    display: flex;
    align-items: center;
    gap: 4px;
}
.timeline-dur-input {
    width: 44px;
    padding: 3px 4px;
    background: var(--bg-input);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xs);
    color: var(--text-primary);
    font-size: 11px;
    font-family: var(--font-mono);
    text-align: center;
}

/* Collapsed state */
.app-layout.timeline-collapsed .timeline-body { display: none; }