/* ============================================
   urban-geo.css — 城市地理栏目专用样式
   ============================================ */

/* ---- Urban Hero Canvas ---- */
#urbanCanvas {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 1;
}

/* ---- Theory Cards ---- */
.theory-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.theory-card {
    background: var(--color-card);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    border: 1px solid var(--color-border-light);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.theory-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-secondary), var(--color-accent));
    opacity: 0;
    transition: var(--transition-base);
}

.theory-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.theory-card:hover::before { opacity: 1; }

.theory-card h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
    color: var(--color-text);
}

.theory-card .theory-author {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
    font-style: italic;
}

.theory-card p {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.8;
    margin-bottom: var(--space-md);
}

.theory-card .theory-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.theory-card .theory-tags span {
    background: var(--color-sky);
    color: var(--color-secondary-dark);
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
}

/* ---- Urban Data Cards Specific ---- */
.urban-data-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
}

.urban-data-card {
    background: var(--color-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border-light);
    overflow: hidden;
    transition: var(--transition-base);
    display: flex;
    flex-direction: column;
}

.urban-data-card:hover {
    box-shadow: var(--shadow-md);
}

.urban-data-card.wide {
    grid-column: span 2;
}

.urban-data-card-header {
    padding: var(--space-lg) var(--space-xl) var(--space-sm);
    border-bottom: 1px solid var(--color-border-light);
}

.urban-data-card-header h3 {
    font-family: var(--font-heading);
    font-size: 1.0625rem;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.urban-chart-container {
    padding: var(--space-lg) var(--space-xl);
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;
}

.urban-chart-container.tall {
    min-height: 380px;
}

/* ---- City Size Pyramid ---- */
.pyramid-row {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border-light);
}

.pyramid-row:last-child { border-bottom: none; }

.pyramid-label {
    min-width: 120px;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    flex-shrink: 0;
}

.pyramid-bar-wrap {
    flex: 1;
    height: 24px;
    background: var(--color-border-light);
    border-radius: var(--radius-sm);
    overflow: hidden;
    position: relative;
}

.pyramid-bar {
    height: 100%;
    border-radius: var(--radius-sm);
    transition: width 1s ease;
}

.pyramid-count {
    min-width: 50px;
    text-align: right;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text);
    flex-shrink: 0;
}

/* ---- China Urbanization Map List ---- */
.province-list {
    padding: var(--space-lg) var(--space-xl);
    max-height: 400px;
    overflow-y: auto;
    flex: 1;
}

.province-row {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border-light);
}

.province-row:last-child { border-bottom: none; }

.province-name {
    min-width: 70px;
    font-size: 0.875rem;
    color: var(--color-text);
    flex-shrink: 0;
}

.province-bar-wrap {
    flex: 1;
    height: 20px;
    background: var(--color-border-light);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.province-bar {
    height: 100%;
    border-radius: var(--radius-sm);
    transition: width 1s ease;
}

.province-rate {
    min-width: 50px;
    text-align: right;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-text);
    flex-shrink: 0;
}

/* ---- Responsive ---- */
@media (min-width: 1024px) and (max-width: 1439px) {
    .theory-grid { grid-template-columns: repeat(2, 1fr); }
    .urban-data-grid { grid-template-columns: repeat(2, 1fr); }
    .urban-data-card.wide { grid-column: span 2; }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .theory-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-lg); }
    .urban-data-grid { grid-template-columns: 1fr; }
    .urban-data-card.wide { grid-column: span 1; }
}

@media (max-width: 767px) {
    .theory-grid { grid-template-columns: 1fr; gap: var(--space-lg); }
    .urban-data-grid { grid-template-columns: 1fr; }
    .urban-data-card.wide { grid-column: span 1; }
    .urban-chart-container { min-height: 260px !important; }
    .pyramid-label { min-width: 100px; font-size: 0.8125rem; }
    .province-name { min-width: 60px; font-size: 0.8125rem; }
}

@media (max-width: 479px) {
    .theory-card { padding: var(--space-xl); }
    .urban-data-card-header { padding: var(--space-md); }
    .urban-chart-container { padding: var(--space-md); }
    .province-list { padding: var(--space-md); }
}