/* ============================================
   diffusion-geo.css — 文化扩散专题专用样式
   ============================================ */

/* ---- Hero Customization ---- */
.diffusion-hero {
    background: linear-gradient(160deg, #1a0a2e 0%, #2d1b4e 30%, #4a148c 60%, #1a3a5c 100%);
}

.diffusion-hero .column-hero-badge .dot {
    background: #FF6F00;
}

/* ---- Core Models: Force 2×2 grid on desktop ---- */
#core-models .subcategory-grid {
    grid-template-columns: repeat(2, 1fr);
}

/* 保持子卡片图标颜色覆盖 */
#core-models .subcategory-card:nth-child(1) .subcategory-icon { background: linear-gradient(135deg, #E3F2FD, #BBDEFB) !important; color: #1565C0 !important; }
#core-models .subcategory-card:nth-child(2) .subcategory-icon { background: linear-gradient(135deg, #FFF3E0, #FFE0B2) !important; color: #E65100 !important; }
#core-models .subcategory-card:nth-child(3) .subcategory-icon { background: linear-gradient(135deg, #FCE4EC, #F8BBD9) !important; color: #C2185B !important; }
#core-models .subcategory-card:nth-child(4) .subcategory-icon { background: linear-gradient(135deg, #E8F5E9, #C8E6C9) !important; color: #2E7D32 !important; }

/* ---- Model Detail (inside subcategory cards) ---- */
.model-detail {
    margin: var(--space-md) 0 var(--space-lg);
    padding: var(--space-md);
    background: var(--color-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
}

.detail-item {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
    font-size: 0.875rem;
    line-height: 1.6;
}

.detail-item:last-child {
    margin-bottom: 0;
}

.detail-label {
    font-weight: 600;
    color: var(--color-text);
    flex-shrink: 0;
    min-width: 70px;
}

.detail-text {
    color: var(--color-text-secondary);
}

/* ---- Influencing Factors ---- */
#influencing-factors { background: var(--color-bg); }

.factors-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
}

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

.factor-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary-light);
}

.factor-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
    opacity: 0.6;
}

.factor-icon {
    width: 56px; height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-md);
}

.factor-card h4 {
    font-family: var(--font-heading);
    font-size: 1.125rem;
    margin-bottom: var(--space-sm);
    color: var(--color-text);
}

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

.factor-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;
}

/* ---- Classic Cases Timeline ---- */
#classic-cases { background: var(--color-card); }

.cases-timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.cases-timeline::before {
    content: '';
    position: absolute;
    left: 80px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--color-accent), var(--color-accent-light));
}

.case-item {
    display: flex;
    gap: var(--space-2xl);
    margin-bottom: var(--space-3xl);
    position: relative;
}

.case-item:last-child {
    margin-bottom: 0;
}

.case-marker {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
    z-index: 2;
    position: relative;
}

.case-era {
    color: white;
    font-size: 0.6875rem;
    font-weight: 700;
    text-align: center;
    line-height: 1.3;
    padding: 0 8px;
}

.case-content {
    flex: 1;
    background: var(--color-bg);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    transition: var(--transition-base);
}

.case-content:hover {
    box-shadow: var(--shadow-md);
}

.case-content h4 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
    color: var(--color-text);
}

.case-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.case-tag {
    background: var(--color-sky);
    color: var(--color-secondary-dark);
    padding: 3px 10px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
}

.case-content p {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.9;
    margin-bottom: var(--space-lg);
}

.case-data {
    display: flex;
    gap: var(--space-xl);
    flex-wrap: wrap;
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border-light);
}

.case-data-item {
    text-align: center;
}

.cd-number {
    display: block;
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-accent);
    line-height: 1.2;
}

.cd-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: 2px;
}

/* ---- Data Chart Containers ---- */
#religionDiffusionChart, #distanceDecayChart, #sCurveChart, #chiliDiffusionChart, #modelsCompareChart {
    width: 100%;
    height: 100%;
}

/* ---- Responsive ---- */
@media (min-width: 1024px) and (max-width: 1439px) {
    .factors-grid { grid-template-columns: repeat(2, 1fr); }
    .cases-timeline::before { left: 60px; }
    .case-marker { width: 60px; height: 60px; }
    .case-item { gap: var(--space-xl); }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .factors-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-lg); }
    .cases-timeline::before { left: 50px; }
    .case-marker { width: 50px; height: 50px; }
    .case-era { font-size: 0.625rem; }
    .case-item { gap: var(--space-lg); }
    .case-data { gap: var(--space-lg); }
}

@media (max-width: 767px) {
    .factors-grid { grid-template-columns: 1fr; gap: var(--space-lg); }
    .cases-timeline::before { left: 24px; }
    .case-item { flex-direction: column; gap: var(--space-md); }
    .case-marker { width: 48px; height: 48px; align-self: flex-start; margin-left: 0; }
    .case-era { font-size: 0.625rem; }
    .case-content { padding: var(--space-lg); }
    .case-data { flex-direction: column; gap: var(--space-sm); }
    .case-data-item { text-align: left; display: flex; gap: var(--space-sm); align-items: center; }
    .cd-label { margin-top: 0; }
    .data-chart-container { min-height: 240px !important; }
    .model-detail { padding: var(--space-sm); }
}

@media (max-width: 479px) {
    .factor-card { padding: var(--space-lg); }
    .case-content { padding: var(--space-md); }
    .case-data-item { flex-direction: column; align-items: flex-start; gap: 2px; }
    .detail-item { flex-direction: column; gap: 2px; }
}