/* ============================================
   language-geo.css — 语言地理栏目专用样式
   ============================================ */

/* ---- Hero Customization ---- */
.language-hero {
    background: linear-gradient(160deg, #0a1628 0%, #0d2137 30%, #1a3a5c 60%, #0d2137 100%);
}

.language-hero .column-hero-badge .dot {
    background: #1565C0;
}

/* ---- Core Topics ---- */
#core-topics .subcategory-card::before {
    background: linear-gradient(90deg, #1565C0, #42A5F5);
}

#core-topics .subcategory-icon {
    background: linear-gradient(135deg, #E3F2FD, #BBDEFB) !important;
    color: #1565C0 !important;
}

/* ---- Language Islands Section ---- */
#language-islands { background: var(--color-bg); }

.island-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xl);
}

.island-card {
    background: var(--color-card);
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid var(--color-border-light);
    transition: var(--transition-base);
}

.island-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
}

.island-visual {
    width: 100%;
    aspect-ratio: 4/3;
    background: var(--color-card);
}

.island-visual svg {
    width: 100%;
    height: 100%;
}

.island-content {
    padding: var(--space-lg);
}

.island-content h4 {
    font-family: var(--font-heading);
    font-size: 1.0625rem;
    margin-bottom: var(--space-sm);
    color: var(--color-text);
}

.island-content p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-md);
}

.island-stat {
    display: inline-block;
    background: var(--color-sky);
    color: var(--color-secondary-dark);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

/* ---- Chart Containers ---- */
#languageFamilyChart, #chineseDialectChart, #languageDiffusionChart,
#toponymyChart, #endangeredChart {
    width: 100%;
    height: 100%;
}

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

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

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

@media (max-width: 479px) {
    .island-content { padding: var(--space-md); }
    .island-visual { aspect-ratio: 16/10; }
}