/* ============================================
   earthquake-belt.css — 全球地震带与板块边界分布
   ============================================ */

/* ---- Page Hero ---- */
.eq-hero {
    min-height: 65vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(160deg, #0a1628 0%, #1a2f4a 40%, #0d2137 100%);
    padding-top: 72px;
}

.eq-hero-canvas {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 1;
}

.eq-hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    max-width: 900px;
    padding: 0 var(--space-lg);
}

.eq-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background: rgba(255,100,50,0.15);
    border: 1px solid rgba(255,100,50,0.3);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    margin-bottom: var(--space-xl);
    color: #FF8A65;
}

.eq-hero-badge .dot {
    width: 8px; height: 8px;
    background: #FF5722;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.eq-hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: var(--space-lg);
}

.eq-hero-title .highlight {
    background: linear-gradient(135deg, #FF7043, #FF5722);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.eq-hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.125rem);
    color: rgba(255,255,255,0.7);
    margin-bottom: var(--space-2xl);
    line-height: 1.8;
    max-width: 680px;
    margin-left: auto;
    margin-right: auto;
}

.eq-hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-3xl);
    flex-wrap: wrap;
}

.eq-stat {
    text-align: center;
}

.eq-stat-num {
    display: block;
    font-family: var(--font-heading);
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    font-weight: 900;
    color: #FF7043;
    line-height: 1;
}

.eq-stat-label {
    font-size: 0.875rem;
    color: rgba(255,255,255,0.55);
    margin-top: var(--space-sm);
}

/* ---- Main Map Section ---- */
.map-section {
    background: var(--color-bg);
    padding: var(--space-4xl) 0;
}

.map-container {
    background: var(--color-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border-light);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.map-header {
    padding: var(--space-xl) var(--space-2xl);
    border-bottom: 1px solid var(--color-border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.map-header h2 {
    font-family: var(--font-heading);
    font-size: 1.375rem;
    color: var(--color-text);
}

.map-header p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin: 0;
}

.map-toolbar {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.map-tool-btn {
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    font-weight: 500;
    border: 1px solid var(--color-border);
    background: var(--color-card);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.map-tool-btn:hover, .map-tool-btn.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.map-canvas-wrap {
    position: relative;
    width: 100%;
    aspect-ratio: 16/9;
    background: #0d2137;
    overflow: hidden;
}

.map-canvas-wrap canvas {
    width: 100%;
    height: 100%;
    display: block;
    cursor: crosshair;
}

.map-tooltip {
    position: absolute;
    background: rgba(10, 22, 40, 0.95);
    border: 1px solid rgba(255,100,50,0.3);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    color: white;
    font-size: 0.8125rem;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s ease;
    z-index: 10;
    min-width: 180px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.4);
}

.map-tooltip.visible { opacity: 1; }

.map-tooltip .tt-title {
    font-weight: 700;
    color: #FF7043;
    margin-bottom: 4px;
    font-size: 0.875rem;
}

.map-tooltip .tt-row {
    display: flex;
    justify-content: space-between;
    padding: 2px 0;
}

.map-legend {
    padding: var(--space-lg) var(--space-2xl);
    background: var(--color-card);
    border-top: 1px solid var(--color-border-light);
    display: flex;
    gap: var(--space-2xl);
    flex-wrap: wrap;
}

.legend-group {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.legend-group-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
}

.legend-color {
    width: 20px; height: 3px;
    border-radius: 2px;
}

.legend-dot {
    width: 10px; height: 10px;
    border-radius: 50%;
}

/* ---- Content Sections ---- */
.content-section {
    padding: var(--space-4xl) 0;
}

.content-section.alt { background: var(--color-card); }

.content-grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: start;
}

.content-grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.content-block h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    margin-bottom: var(--space-md);
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.content-block h3 .icon {
    width: 36px; height: 36px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.125rem;
    flex-shrink: 0;
}

.content-block p {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-md);
}

.content-block ul {
    list-style: none;
    padding: 0;
}

.content-block ul li {
    padding: var(--space-sm) 0;
    padding-left: var(--space-lg);
    position: relative;
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.7;
    border-bottom: 1px solid var(--color-border-light);
}

.content-block ul li:last-child { border-bottom: none; }

.content-block ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 1.1em;
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--color-primary);
}

/* ---- Belt Cards ---- */
.belt-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;
}

.belt-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.belt-card-header {
    padding: var(--space-xl);
    color: white;
    position: relative;
    overflow: hidden;
}

.belt-card-header.ring-of-fire { background: linear-gradient(135deg, #BF360C, #E64A19); }
.belt-card-header.alpine-himalayan { background: linear-gradient(135deg, #5D4037, #8D6E63); }
.belt-card-header.mid-ocean { background: linear-gradient(135deg, #01579B, #0277BD); }

.belt-card-header h4 {
    font-family: var(--font-heading);
    font-size: 1.125rem;
    margin-bottom: var(--space-xs);
    position: relative;
    z-index: 1;
}

.belt-card-header p {
    font-size: 0.8125rem;
    opacity: 0.85;
    margin: 0;
    position: relative;
    z-index: 1;
}

.belt-card-body {
    padding: var(--space-xl);
    flex: 1;
    display: flex;
    flex-direction: column;
}

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

.belt-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    margin-top: auto;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border-light);
}

.belt-stat {
    text-align: center;
}

.belt-stat-num {
    display: block;
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

.belt-stat-label {
    font-size: 0.6875rem;
    color: var(--color-text-muted);
    margin-top: 2px;
}

/* ---- Timeline ---- */
.timeline-section {
    padding: var(--space-4xl) 0;
    background: var(--color-bg);
}

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

.timeline-line {
    position: absolute;
    left: 50%;
    top: 0; bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, #FF5722, #FF8A65, #FFCC80);
    transform: translateX(-50%);
}

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

.timeline-item:nth-child(even) { flex-direction: row-reverse; }

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

.timeline-content:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary-light);
}

.timeline-dot {
    width: 48px; height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, #FF5722, #FF8A65);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
    box-shadow: 0 0 0 4px var(--color-bg), 0 0 0 6px rgba(255,87,34,0.3);
    z-index: 2;
}

.timeline-content .date {
    font-size: 0.8125rem;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

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

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

.timeline-meta {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.timeline-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ---- Data Table ---- */
.data-table-wrap {
    background: var(--color-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border-light);
    overflow: hidden;
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.data-table thead {
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-secondary-dark));
    color: white;
}

.data-table th {
    padding: var(--space-md) var(--space-lg);
    text-align: left;
    font-weight: 600;
    font-size: 0.8125rem;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.data-table td {
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--color-border-light);
    color: var(--color-text-secondary);
    vertical-align: top;
}

.data-table tbody tr:hover {
    background: var(--color-sky);
}

.data-table tbody tr:last-child td { border-bottom: none; }

.mag-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
}

.mag-7 { background: #FFEBEE; color: #C62828; }
.mag-6 { background: #FFF3E0; color: #E65100; }
.mag-5 { background: #FFFDE7; color: #F57F17; }

/* ---- Knowledge Cards ---- */
.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
}

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

.knowledge-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary-light);
}

.knowledge-card h4 {
    font-family: var(--font-heading);
    font-size: 1.0625rem;
    margin-bottom: var(--space-sm);
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.knowledge-card p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 0;
}

/* ---- Citation ---- */
.citation-box {
    background: var(--color-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    margin-top: var(--space-2xl);
}

.citation-box h4 {
    font-family: var(--font-heading);
    font-size: 1rem;
    margin-bottom: var(--space-md);
    color: var(--color-text);
}

.citation-box p, .citation-box li {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.citation-box ul {
    list-style: none;
    padding: 0;
}

.citation-box ul li {
    padding-left: var(--space-lg);
    position: relative;
    margin-bottom: var(--space-sm);
}

.citation-box ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

/* ---- Responsive ---- */
@media (max-width: 1023px) {
    .content-grid-2 { grid-template-columns: 1fr; }
    .content-grid-3 { grid-template-columns: 1fr; }
    .knowledge-grid { grid-template-columns: 1fr; }
    .eq-hero-stats { gap: var(--space-xl); }
    .map-legend { gap: var(--space-lg); }
    .timeline-line { left: 24px; }
    .timeline-item,
    .timeline-item:nth-child(even) { flex-direction: row; }
    .timeline-content { margin-left: var(--space-lg); }
    .timeline-dot { width: 40px; height: 40px; font-size: 0.625rem; }
}

@media (max-width: 479px) {
    .eq-hero-title { font-size: 1.75rem; }
    .eq-stat-num { font-size: 1.5rem; }
    .map-header { flex-direction: column; align-items: flex-start; }
    .map-canvas-wrap { aspect-ratio: 4/3; }
    .belt-stats { grid-template-columns: 1fr; }
    .timeline-line { left: 16px; }
    .timeline-content { padding: var(--space-lg); margin-left: var(--space-sm); }
    .data-table { font-size: 0.75rem; }
    .data-table th, .data-table td { padding: var(--space-sm); }
}