/* 数据可视化页面：独立布局（不依赖 sidebar） */
body.viz-page {
    display: block;
    min-height: 100vh;
}

.viz-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 28px 28px 36px;
}

.viz-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
}

.viz-header-left {
    display: flex;
    align-items: baseline;
    gap: 12px;
    min-width: 0;
}

.viz-back {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    white-space: nowrap;
}

.viz-title {
    font-size: 1.6rem;
    color: var(--primary-color);
    margin: 0;
}

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

.viz-year {
    display: flex;
    align-items: center;
    gap: 8px;
}

.viz-label {
    font-size: 0.95rem;
    opacity: 0.9;
}

/* 自定义下拉菜单 */
.custom-select {
    position: relative;
    width: 120px; /* 根据年份文字长度适度固定 */
    font-size: 0.95rem;
}

.select-trigger {
    appearance: none;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-color);
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s;
    font-family: inherit;
    font-size: inherit;
}

.select-trigger:hover {
    background-color: var(--row-hover);
    border-color: var(--accent-color);
}

.select-trigger:focus-visible {
    outline: 2px solid var(--accent-color);
    border-color: var(--accent-color);
}

.arrow {
    display: inline-block;
    width: 0.6em;
    height: 0.6em;
    margin-left: 8px;
    background-color: currentColor;
    clip-path: polygon(10% 35%, 50% 75%, 90% 35%);
    transition: transform 0.3s ease;
}

/* 展开状态：箭头旋转 */
.custom-select.open .arrow {
    transform: rotate(180deg);
}

.select-options {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    width: 100%;
    margin: 0;
    padding: 6px 0;
    list-style: none;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    z-index: 100;
    
    /* 动画初始状态 */
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px) scale(0.98);
    transition: opacity 0.25s cubic-bezier(0.2, 0.8, 0.2, 1),
                transform 0.25s cubic-bezier(0.2, 0.8, 0.2, 1),
                visibility 0.25s;
    transform-origin: top center;
}

/* 展开状态：显示列表 */
.custom-select.open .select-options {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.select-option {
    padding: 8px 12px;
    cursor: pointer;
    transition: background-color 0.15s, color 0.15s;
    color: var(--text-color);
}

.select-option:hover,
.select-option:focus {
    background-color: var(--row-hover);
    color: var(--accent-color);
    outline: none;
}

.select-option[aria-selected="true"] {
    background-color: var(--row-hover);
    color: var(--accent-color);
    font-weight: 600;
}

.viz-theme-toggle {
    width: auto;
    padding: 8px 10px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
}

@media (hover: hover) and (pointer: fine) {
    .viz-theme-toggle:hover {
        background-color: var(--row-hover);
    }
}

.viz-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.viz-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 14px 14px 12px;
    box-shadow: 0 6px 18px rgba(0,0,0,0.05);
}

.viz-card.viz-card-full {
    grid-column: 1 / -1;
}

.viz-card.viz-card-full .viz-card-body {
    min-height: 320px;
}

.viz-card.viz-card-full .viz-chart {
    height: 320px;
}

.viz-card-title {
    font-size: 1.05rem;
    color: var(--primary-color);
    margin: 0 0 10px;
}

.viz-card-body {
    min-height: 260px;
}

.viz-chart {
    width: 100%;
    height: 260px;
}

.viz-chart-note {
    margin: 10px 2px 0;
    font-size: 0.92rem;
    line-height: 1.45;
    color: var(--text-color);
    opacity: 0.78;
}

.viz-note-trigger {
    appearance: none;
    border: none;
    background: transparent;
    color: var(--accent-color);
    cursor: help;
    font: inherit;
    padding: 0 1px;
    line-height: 1;
    opacity: 0.9;
    display: inline-block;
    vertical-align: super;
    font-size: 0.86em;
    position: relative;
    top: -0.15em;
}

.viz-note-trigger:hover {
    opacity: 1;
}

/* 统计卡片样式 */
.viz-stats-card-body {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.stats-item {
    display: flex;
    gap: 12px;
    padding: 14px;
    background: var(--bg-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: transform 0.2s, box-shadow 0.2s;
}

.stats-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.stats-item-content {
    flex: 1;
    min-width: 0;
}

.stats-item-label {
    font-size: 0.95rem;
    color: var(--text-color);
    opacity: 0.85;
    margin-bottom: 6px;
}

.stats-item-value {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 8px;
}

.stats-item-detail {
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.8;
    line-height: 1.6;
}

.stats-detail-line {
    margin: 4px 0;
}

.stats-detail-line strong {
    color: var(--primary-color);
    font-weight: 600;
}

.stats-note {
    margin: 8px 0 0 0;
    padding: 8px 12px;
    background: var(--bg-color);
    border-left: 3px solid var(--accent-color);
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--text-color);
    opacity: 0.85;
    border-radius: 4px;
}

@media (max-width: 900px) {
    .viz-grid {
        grid-template-columns: 1fr;
    }

    /* 移动端：只固定图表区域高度；card-body 需要自适应以容纳"说明"文字 */
    .viz-card-body {
        min-height: 280px;
        height: auto;
    }

    .viz-chart {
        height: 280px;
    }
    
    .stats-item {
        flex-direction: column;
        gap: 10px;
    }
    
    .stats-item-value {
        font-size: 1.4rem;
    }
}

@media (max-width: 768px) {
    .viz-main {
        padding: 18px 14px 26px;
    }

    .viz-header {
        flex-direction: column;
        align-items: stretch;
    }

    .viz-title {
        font-size: 1.4rem;
    }
}