/* ==================== 基础重置 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
    background: #1a1a2e;
    color: #eee;
    overflow: hidden;
}

/* ==================== 布局框架 ==================== */
#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* ==================== 顶部工具栏 ==================== */
#toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    background: #16213e;
    border-bottom: 2px solid #0f3460;
}

#toolbar h1 {
    font-size: 18px;
    color: #e94560;
}

.toolbar-actions button {
    margin-left: 10px;
    padding: 6px 12px;
    background: #0f3460;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.3s;
}

.toolbar-actions button:hover {
    background: #e94560;
}

/* ==================== 主工作区 ==================== */
#workspace {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ==================== 左侧素材面板 ==================== */
#assets-panel {
    width: 200px;
    background: #16213e;
    border-right: 2px solid #0f3460;
    padding: 15px;
    overflow-y: auto;
}

#assets-panel h3 {
    color: #e94560;
    margin-bottom: 15px;
    font-size: 16px;
}

.asset-category {
    margin-bottom: 20px;
}

.asset-category h4 {
    color: #533483;
    font-size: 14px;
    margin-bottom: 10px;
    padding-left: 5px;
    border-left: 3px solid #e94560;
}

.asset-items {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.asset-item {
    padding: 8px 12px;
    background: #0f3460;
    border-radius: 6px;
    cursor: move;
    font-size: 13px;
    transition: all 0.3s;
    user-select: none;
}

.asset-item:hover {
    background: #e94560;
    transform: translateY(-2px);
}

/* ==================== 画布区域 ==================== */
#canvas-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: #0f0f1a;
}

#scene-tabs {
    display: flex;
    align-items: center;
    padding: 10px;
    background: #16213e;
    border-bottom: 2px solid #0f3460;
}

#tabs-list {
    display: flex;
    gap: 8px;
    flex: 1;
}

.scene-tab {
    padding: 8px 16px;
    background: #0f3460;
    border-radius: 4px 4px 0 0;
    cursor: pointer;
    font-size: 14px;
    position: relative;
}

.scene-tab.active {
    background: #e94560;
}

.scene-tab .close-btn {
    margin-left: 8px;
    opacity: 0.6;
}

.scene-tab .close-btn:hover {
    opacity: 1;
}

#add-scene-btn {
    padding: 8px 16px;
    background: #533483;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    margin-left: 10px;
}

#canvas-wrapper {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    overflow: auto;
}

#main-canvas {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    cursor: crosshair;
}

/* ==================== 底部时间轴面板 ==================== */
#timeline-panel {
    background: #16213e;
    border-top: 2px solid #0f3460;
    padding: 15px 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* 播放控制栏 */
#playback-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

#playback-controls button {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: #0f3460;
    color: #fff;
    font-size: 18px;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
}

#playback-controls button:hover {
    background: #e94560;
    transform: scale(1.1);
}

#frame-counter {
    font-size: 14px;
    color: #aaa;
    min-width: 80px;
}

#playback-controls label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: #aaa;
}

#fps-slider {
    width: 120px;
    cursor: pointer;
}

#fps-display {
    color: #e94560;
    font-weight: bold;
    min-width: 50px;
}

/* 帧缩略图时间轴 */
#timeline-frames {
    display: flex;
    gap: 8px;
    padding: 10px;
    background: #0f0f1a;
    border-radius: 6px;
    overflow-x: auto;
    min-height: 70px;
    align-items: center;
}

.frame-thumb {
    width: 80px;
    height: 60px;
    background: #0f3460;
    border: 2px solid #533483;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    color: #aaa;
    position: relative;
    transition: all 0.3s;
    flex-shrink: 0;
}

.frame-thumb:hover {
    border-color: #e94560;
    transform: translateY(-2px);
}

.frame-thumb.active {
    border-color: #e94560;
    background: #533483;
    box-shadow: 0 0 10px rgba(233, 69, 96, 0.5);
}

.frame-thumb::before {
    content: attr(data-frame);
    position: absolute;
    top: 2px;
    left: 4px;
    font-size: 10px;
    color: #fff;
    background: rgba(0,0,0,0.5);
    padding: 1px 4px;
    border-radius: 2px;
}

/* 时间轴操作按钮 */
#timeline-actions {
    display: flex;
    gap: 10px;
}

#timeline-actions button {
    padding: 8px 16px;
    background: #0f3460;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s;
}

#timeline-actions button:hover {
    background: #e94560;
}

/* ==================== 画布上的素材样式 ==================== */
.canvas-asset {
    position: absolute;
    cursor: move;
    user-select: none;
    font-size: 48px;
    filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.3));
    transition: transform 0.1s;
}

.canvas-asset:hover {
    transform: scale(1.1);
}

.canvas-asset.selected {
    outline: 2px dashed #e94560;
    outline-offset: 4px;
}

/* ==================== 滚动条样式 ==================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #0f0f1a;
}

::-webkit-scrollbar-thumb {
    background: #533483;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #e94560;
}