/* ============================================
   karst.css — 喀斯特地貌页面专属样式
   ============================================ */

/* ---- Hero ---- */
#karst-hero {
    background: linear-gradient(160deg, #0a1f0f 0%, #0d3320 40%, #0a2818 100%);
}

/* ---- Overview ---- */
.overview-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: start;
}

.overview-text h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    margin-bottom: var(--space-lg);
    color: var(--color-text);
}

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

.overview-stats-mini {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-xl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border-light);
}

.overview-stat-mini {
    text-align: center;
    padding: var(--space-md);
    background: var(--color-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
}

.overview-stat-mini .num {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
}

.overview-stat-mini .label {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: var(--space-xs);
}

.overview-visual {
    border-radius: var(--radius-xl);
    overflow: hidden;
    min-height: 420px;
    position: relative;
}

.overview-visual canvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* ---- Formation ---- */
.formation-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: start;
}

.formation-formula {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.formula-card {
    background: var(--color-card);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    border: 1px solid var(--color-border-light);
}

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

.formula-box {
    background: #f5f5f5;
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    margin-bottom: var(--space-md);
    text-align: center;
    font-family: var(--font-mono);
    font-size: 1.125rem;
    color: var(--color-text);
    border-left: 4px solid var(--color-primary);
}

.formula-card p {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 0;
}

.factor-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.factor-item {
    display: flex;
    gap: var(--space-md);
    align-items: flex-start;
}

.factor-num {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    font-weight: 700;
    flex-shrink: 0;
}

.factor-item strong {
    display: block;
    color: var(--color-text);
    margin-bottom: 2px;
}

.factor-item p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: 0;
    line-height: 1.6;
}

.formation-visual {
    background: var(--color-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border-light);
    padding: var(--space-xl);
}

.dissolution-wrap canvas {
    width: 100%;
    display: block;
}

.canvas-caption {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: var(--space-md);
    font-style: italic;
    text-align: center;
}

/* ---- Types Tabs ---- */
.types-tabs {
    display: flex;
    justify-content: center;
    gap: var(--space-xs);
    margin-bottom: var(--space-2xl);
}

.type-tab {
    padding: var(--space-sm) var(--space-xl);
    border-radius: var(--radius-full);
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    background: var(--color-bg);
    border: 1px solid var(--color-border-light);
    cursor: pointer;
    transition: var(--transition-fast);
}

.type-tab:hover {
    background: var(--color-border-light);
    color: var(--color-text);
}

.type-tab.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.type-panel {
    display: none;
}

.type-panel.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.types-canvas-wrap {
    background: var(--color-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border-light);
    padding: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

.types-canvas-wrap canvas {
    display: block;
    margin: 0 auto;
    width: 100%;
}

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

.type-card {
    background: var(--color-card);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    border: 1px solid var(--color-border-light);
    text-align: center;
    transition: var(--transition-base);
}

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

.type-icon {
    font-size: 2rem;
    margin-bottom: var(--space-sm);
}

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

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

/* ---- Evolution ---- */
.evolution-canvas-wrap {
    background: var(--color-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border-light);
    padding: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

.evolution-canvas-wrap canvas {
    display: block;
    margin: 0 auto;
    width: 100%;
}

.canvas-note {
    text-align: center;
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-top: var(--space-lg);
    font-style: italic;
}

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

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

.evo-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    opacity: 0;
    transition: var(--transition-base);
}

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

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

.evo-stage {
    font-family: var(--font-heading);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-primary-dark);
    margin-bottom: var(--space-xs);
}

.evo-age {
    font-size: 0.8125rem;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: var(--space-md);
}

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

/* ---- Distribution ---- */
.distribution-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-3xl);
}

.dist-map-wrap {
    background: var(--color-card);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border-light);
    padding: var(--space-xl);
    overflow-x: auto;
}

.dist-map-wrap canvas {
    display: block;
    margin: 0 auto;
    min-width: 400px;
    width: 100%;
}

.dist-legend-wrap h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    text-align: center;
    margin-bottom: var(--space-xl);
    color: var(--color-text);
}

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

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

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

.dist-region-card h4 {
    font-family: var(--font-heading);
    font-size: 1.0625rem;
    margin-bottom: var(--space-xs);
    color: var(--color-text);
}

.dist-meta {
    font-size: 0.8125rem;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

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

/* ---- Ecology ---- */
.ecology-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

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

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

.eco-card.eco-major {
    grid-column: span 1;
    grid-row: span 2;
    display: flex;
    flex-direction: column;
}

.eco-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-md);
}

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

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

.eco-stat {
    margin-top: auto;
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border-light);
}

.eco-stat-num {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
}

.eco-stat-label {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

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

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

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

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

.data-source {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.data-card-body {
    padding: var(--space-xl);
}

.data-canvas-wrap {
    background: #fafafa;
    border-radius: var(--radius-lg);
    padding: var(--space-md);
}

.data-canvas-wrap canvas {
    width: 100%;
    display: block;
}

/* ---- Cases ---- */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

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

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

.case-ribbon {
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    padding: var(--space-xs) var(--space-md);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    background: var(--color-primary);
}

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

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

.case-meta {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

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

.case-tag {
    display: inline-block;
    font-size: 0.75rem;
    padding: 3px 12px;
    border-radius: var(--radius-full);
    background: var(--color-sky);
    color: var(--color-secondary-dark);
    font-weight: 500;
}

/* ---- Breadcrumb ---- */
.breadcrumb {
    background: var(--color-card);
    border-bottom: 1px solid var(--color-border-light);
    padding: var(--space-sm) 0;
}

.breadcrumb-inner {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.breadcrumb-inner a {
    color: var(--color-text-secondary);
}

.breadcrumb-inner a:hover {
    color: var(--color-secondary);
}

.breadcrumb-inner .sep {
    opacity: 0.4;
}

.breadcrumb-inner .current {
    color: var(--color-text);
    font-weight: 500;
}

/* ---- Column Hero ---- */
.column-hero {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 72px;
}

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

.column-hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    max-width: 800px;
    padding: var(--space-3xl) var(--space-lg);
}

.column-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255,255,255,0.15);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    margin-bottom: var(--space-xl);
    letter-spacing: 0.05em;
}

.column-hero-content h1 {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: var(--space-lg);
    text-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.column-hero-content p {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: rgba(255,255,255,0.75);
    line-height: 1.8;
    max-width: 700px;
    margin: 0 auto;
}

/* ---- Responsive ---- */
@media (max-width: 1023px) {
    .overview-grid { grid-template-columns: 1fr; }
    .formation-grid { grid-template-columns: 1fr; }
    .types-grid { grid-template-columns: repeat(2, 1fr); }
    .evolution-grid { grid-template-columns: repeat(2, 1fr); }
    .distribution-grid { grid-template-columns: 1fr; }
    .dist-regions-grid { grid-template-columns: repeat(2, 1fr); }
    .ecology-grid { grid-template-columns: repeat(2, 1fr); }
    .data-spotlight-grid { grid-template-columns: 1fr; }
    .cases-grid { grid-template-columns: repeat(2, 1fr); }
    .eco-card.eco-major { grid-column: span 1; grid-row: span 1; }
    .types-canvas-wrap canvas { width: 100%; }
    .evolution-canvas-wrap canvas { width: 100%; }
}

@media (max-width: 767px) {
    .types-grid { grid-template-columns: 1fr; }
    .evolution-grid { grid-template-columns: 1fr; }
    .dist-regions-grid { grid-template-columns: 1fr; }
    .ecology-grid { grid-template-columns: 1fr; }
    .cases-grid { grid-template-columns: 1fr; }
    .types-tabs { flex-wrap: wrap; }
    .type-tab { font-size: 0.875rem; padding: var(--space-sm) var(--space-lg); }
    .overview-stats-mini { grid-template-columns: 1fr; }
    .types-canvas-wrap canvas { width: 100%; }
    .evolution-canvas-wrap canvas { width: 100%; }
    .dist-map-wrap canvas { min-width: 300px; }
}