/* ===== 时间线左右布局 ===== */
.timeline-layout {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.timeline-main {
    flex: 1;
    min-width: 0;
}

.timeline-section {
    max-width: none;
}

/* ===== 时间线样式 ===== */
.timeline-container {
    overflow-x: auto;
    padding: 0.5rem 0;
    margin-bottom: 0;
}

.timeline-track {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: relative;
}

/* 阶段组 */
.timeline-group {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 1rem;
    overflow: hidden;
    background: var(--bg-card);
}

.group-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.2rem;
    cursor: pointer;
    transition: var(--transition);
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
}

.group-header:hover {
    background: var(--bg-card-hover);
}

.group-dot {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    flex-shrink: 0;
}

.group-info {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.group-icon {
    font-size: 1.2rem;
}

.group-name {
    font-weight: 600;
    font-size: 1rem;
}

.group-age {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.group-count {
    font-size: 0.75rem;
    color: var(--primary-light);
    background: var(--bg);
    padding: 0.2rem 0.6rem;
    border-radius: 10px;
}

.group-toggle {
    font-size: 0.8rem;
    color: var(--text-muted);
    transition: var(--transition);
}

/* 组内阶段 */
.group-stages {
    padding: 0.5rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 0.8rem;
    transition: all 0.3s ease;
}

.group-stages.collapsed {
    display: none;
}

/* 单个阶段 */
.timeline-stage {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.stage-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 0.8rem;
    background: rgba(255,255,255,0.02);
    border-bottom: 1px solid var(--border);
}

.stage-dot-small {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.stage-title {
    font-size: 0.8rem;
    font-weight: 600;
}

.stage-age {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-left: auto;
}

.stage-cards {
    min-height: 80px;
    padding: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    transition: var(--transition);
}

.stage-cards.drag-over {
    background: var(--bg-card-hover);
    box-shadow: inset 0 0 10px rgba(108, 92, 231, 0.2);
}

.stage-empty {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-align: center;
    padding: 1.5rem 0.5rem;
    border: 1px dashed var(--border);
    border-radius: var(--radius-sm);
    opacity: 0.6;
}

/* ===== 事件卡片 ===== */
.event-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.5rem 0.6rem;
    cursor: grab;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    user-select: none;
    flex-wrap: wrap;
}

.event-card:hover {
    border-color: var(--primary);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.event-card:active {
    cursor: grabbing;
    opacity: 0.8;
}

.event-card.dragging {
    opacity: 0.5;
    transform: rotate(2deg);
}

.event-card .card-icon {
    font-size: 1rem;
    flex-shrink: 0;
}

.event-card .card-text {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}

.event-card .card-remove {
    opacity: 0;
    background: none;
    border: none;
    color: var(--danger);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
    padding: 0 0.2rem;
}

.event-card:hover .card-remove {
    opacity: 1;
}

/* 卡片分类颜色 */
.event-card[data-category="study"] { border-left: 3px solid var(--primary); }
.event-card[data-category="work"] { border-left: 3px solid var(--warning); }
.event-card[data-category="life"] { border-left: 3px solid var(--accent); }
.event-card[data-category="entertainment"] { border-left: 3px solid var(--secondary); }
.event-card[data-category="health"] { border-left: 3px solid var(--success); }

/* 卡片进度条 */
.card-progress {
    width: 100%;
    height: 3px;
    background: var(--border);
    border-radius: 2px;
    overflow: hidden;
    flex-basis: 100%;
}

.card-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 2px;
    transition: width 0.5s ease;
}

/* ===== 卡片面板 ===== */
.card-palette {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.card-palette h3 {
    margin-bottom: 1rem;
}

.palette-categories {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.cat-btn {
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: var(--transition);
}

.cat-btn:hover,
.cat-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.palette-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 0.5rem;
    margin-bottom: 1rem;
    max-height: 250px;
    overflow-y: auto;
    padding: 0.5rem;
}

.palette-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.5rem;
    cursor: grab;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.75rem;
}

.palette-card:hover {
    border-color: var(--primary);
    background: var(--bg-card-hover);
}

.palette-card:active {
    cursor: grabbing;
}

.palette-card .card-icon {
    font-size: 1rem;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .group-stages {
        grid-template-columns: 1fr;
    }

    .group-info {
        flex-wrap: wrap;
        gap: 0.4rem;
    }

    .group-header {
        padding: 0.8rem;
    }

    .palette-cards {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }

    .card-palette {
        padding: 1rem;
    }

    .palette-categories {
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 0.3rem;
        -webkit-overflow-scrolling: touch;
    }

    .cat-btn {
        white-space: nowrap;
        flex-shrink: 0;
    }
}

/* iPad 及以上：左右布局 */
@media (min-width: 769px) {
    .timeline-layout {
        flex-direction: row;
        align-items: flex-start;
        gap: 1.2rem;
    }

    .timeline-main {
        flex: 1;
        min-width: 0;
    }

    .card-palette {
        width: 280px;
        flex-shrink: 0;
        position: sticky;
        top: calc(var(--nav-height) + 1rem);
        max-height: calc(100vh - var(--nav-height) - 2rem);
        overflow-y: auto;
    }

    .palette-cards {
        grid-template-columns: 1fr;
        max-height: none;
        overflow-y: visible;
    }

    .palette-card {
        padding: 0.6rem 0.7rem;
    }

    .event-card:hover {
        border-color: var(--primary);
        transform: translateY(-1px);
        box-shadow: 0 2px 8px rgba(0,0,0,0.2);
    }

    .palette-card:hover {
        border-color: var(--primary);
        background: var(--bg-card-hover);
    }
}

/* iPad 专属：稍宽的侧栏 */
@media (min-width: 769px) and (max-width: 1024px) {
    .card-palette {
        width: 240px;
        padding: 1rem;
    }

    .group-stages {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    }
}

/* 大屏：更宽的侧栏 */
@media (min-width: 1025px) {
    .card-palette {
        width: 300px;
    }
}