/* ============================================
   population-geo.css — 人口地理子页面专用样式
   ============================================ */

/* ---- Hero Override ---- */
#popGeoCanvas { z-index: 1; }

/* ---- Topic Grid ---- */
.topic-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

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

.topic-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);
}

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

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

.topic-icon {
    width: 64px; height: 64px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, #E3F2FD, #BBDEFB);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-secondary);
    margin-bottom: var(--space-lg);
}

.topic-card:nth-child(2) .topic-icon { background: linear-gradient(135deg, #FFF3E0, #FFE0B2); color: var(--color-accent); }
.topic-card:nth-child(3) .topic-icon { background: linear-gradient(135deg, #FCE4EC, #F8BBD9); color: #C2185B; }
.topic-card:nth-child(4) .topic-icon { background: linear-gradient(135deg, #E8F5E9, #C8E6C9); color: var(--color-primary); }
.topic-card:nth-child(5) .topic-icon { background: linear-gradient(135deg, #F3E5F5, #E1BEE7); color: #7B1FA2; }
.topic-card:nth-child(6) .topic-icon { background: linear-gradient(135deg, #E0F2F1, #B2DFDB); color: #00796B; }

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

.topic-card p {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.7;
    margin-bottom: var(--space-md);
}

.topic-stats {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.topic-stats span {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.topic-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-lg);
}

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

/* ---- Data Cards Specific ---- */
.pyramid-compare {
    display: flex;
    gap: var(--space-xl);
    align-items: center;
    justify-content: center;
    padding: var(--space-lg) var(--space-xl);
    flex: 1;
}

.pyramid-box {
    text-align: center;
}

.pyramid-box h4 {
    font-family: var(--font-heading);
    font-size: 0.9375rem;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.pyramid-box .pyramid-year {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.flow-legend {
    display: flex;
    gap: var(--space-lg);
    padding: 0 var(--space-xl) var(--space-md);
    flex-wrap: wrap;
    justify-content: center;
}

.flow-legend .legend-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
}

.flow-legend .legend-arrow {
    width: 24px;
    height: 3px;
    border-radius: 2px;
}

/* ---- Policy Timeline ---- */
.policy-timeline {
    padding: var(--space-lg) var(--space-xl);
    max-height: 340px;
    overflow-y: auto;
    flex: 1;
}

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

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

.policy-year {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-secondary);
    min-width: 70px;
    flex-shrink: 0;
}

.policy-event {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* ---- Responsive ---- */
@media (min-width: 1024px) and (max-width: 1439px) {
    .topic-grid { grid-template-columns: repeat(2, 1fr); }
    .pyramid-compare { flex-direction: column; }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .topic-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-lg); }
    .pyramid-compare { flex-direction: column; }
}

@media (max-width: 767px) {
    .topic-grid { grid-template-columns: 1fr; gap: var(--space-lg); }
    .pyramid-compare { flex-direction: column; }
    .data-chart-container { min-height: 240px !important; }
}