/* ============================================
   hydrology.css — 水文地理栏目首页专用样式
   ============================================ */

/* ---- Column Hero ---- */
.hydro-hero {
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(160deg, #001f3f 0%, #003d5c 30%, #0077be 60%, #4fc3f7 100%);
    padding-top: 72px;
}

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

.hydro-hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    max-width: 800px;
    padding: 0 var(--space-lg);
}

.hydro-hero-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(255,255,255,0.2);
    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;
}

.hydro-hero-badge .dot {
    width: 8px; height: 8px;
    background: var(--color-secondary-light);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.hydro-hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: var(--space-md);
    text-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.hydro-hero-title .highlight {
    background: linear-gradient(135deg, #4fc3f7, #81d4fa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hydro-hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: rgba(255,255,255,0.8);
    margin-bottom: var(--space-xl);
    line-height: 1.8;
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
}

.hydro-hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-2xl);
    flex-wrap: wrap;
}

.hydro-hero-stat {
    text-align: center;
}

.hydro-hero-stat .num {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 700;
    color: #4fc3f7;
    display: block;
}

.hydro-hero-stat .label {
    font-size: 0.8125rem;
    color: rgba(255,255,255,0.6);
    margin-top: 4px;
}

/* ---- Column Overview ---- */
.hydro-overview {
    background: var(--color-card);
    padding: var(--space-4xl) 0;
}

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

.overview-text h2 {
    font-family: var(--font-heading);
    font-size: clamp(1.5rem, 3vw, 2rem);
    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-visual {
    position: relative;
    background: linear-gradient(135deg, #E3F2FD, #BBDEFB);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    min-height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.overview-facts {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-xl);
}

.overview-fact {
    background: var(--color-sky);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    border-left: 3px solid var(--color-secondary);
}

.overview-fact .fact-num {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-secondary);
}

.overview-fact .fact-label {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    margin-top: 2px;
}

/* ---- Subcategory Grid ---- */
.hydro-subcategories {
    background: var(--color-bg);
    padding: var(--space-4xl) 0;
}

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

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

.subcat-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-secondary), #4fc3f7);
    opacity: 0;
    transition: var(--transition-base);
}

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

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

.subcat-icon {
    width: 64px; height: 64px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    margin-bottom: var(--space-md);
}

.subcat-card:nth-child(1) .subcat-icon { background: linear-gradient(135deg, #E3F2FD, #BBDEFB); }
.subcat-card:nth-child(2) .subcat-icon { background: linear-gradient(135deg, #E0F7FA, #B2EBF2); }
.subcat-card:nth-child(3) .subcat-icon { background: linear-gradient(135deg, #E8F5E9, #C8E6C9); }
.subcat-card:nth-child(4) .subcat-icon { background: linear-gradient(135deg, #FFF3E0, #FFE0B2); }
.subcat-card:nth-child(5) .subcat-icon { background: linear-gradient(135deg, #F3E5F5, #E1BEE7); }
.subcat-card:nth-child(6) .subcat-icon { background: linear-gradient(135deg, #ECEFF1, #CFD8DC); }

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

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

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

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

.subcat-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--color-secondary);
    font-weight: 600;
    font-size: 0.9375rem;
}

.subcat-link:hover { gap: 8px; }

/* ---- Data Spotlight ---- */
.hydro-data {
    background: var(--color-card);
    padding: var(--space-4xl) 0;
}

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

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

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

.data-card h3 {
    font-family: var(--font-heading);
    font-size: 1.125rem;
    margin-bottom: var(--space-md);
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.data-card .chart-container {
    width: 100%;
    height: 280px;
    position: relative;
}

.data-card .chart-container canvas {
    width: 100%;
    height: 100%;
}

.data-card .chart-source {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: var(--space-sm);
    text-align: right;
}

/* ---- Featured Articles ---- */
.hydro-articles {
    background: var(--color-bg);
    padding: var(--space-4xl) 0;
}

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

/* ---- Related Tracks ---- */
.hydro-tracks {
    background: var(--color-card);
    padding: var(--space-4xl) 0;
}

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

.track-mini-card {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    aspect-ratio: 16/9;
    cursor: pointer;
    transition: var(--transition-base);
}

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

.track-mini-card .track-img {
    width: 100%; height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.track-mini-card:hover .track-img { transform: scale(1.05); }

.track-mini-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, rgba(0,0,0,0.2) 50%, transparent 100%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: var(--space-xl);
    color: white;
}

.track-mini-overlay .track-region {
    font-size: 0.8125rem;
    color: rgba(255,255,255,0.7);
    margin-bottom: var(--space-xs);
}

.track-mini-overlay .track-name {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
}

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

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

.breadcrumb-inner a { color: var(--color-secondary); }
.breadcrumb-inner a:hover { color: var(--color-secondary-dark); }
.breadcrumb-inner .sep { color: var(--color-text-muted); }
.breadcrumb-inner .current { color: var(--color-text); font-weight: 500; }

/* ---- Responsive ---- */
@media (min-width: 1024px) and (max-width: 1439px) {
    .subcat-grid { grid-template-columns: repeat(2, 1fr); }
    .data-grid { grid-template-columns: repeat(2, 1fr); }
    .hydro-articles .content-grid { grid-template-columns: repeat(2, 1fr); }
    .tracks-mini-grid { grid-template-columns: repeat(2, 1fr); }
    .overview-grid { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .subcat-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-lg); }
    .data-grid { grid-template-columns: 1fr; }
    .hydro-articles .content-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-lg); }
    .tracks-mini-grid { grid-template-columns: 1fr; }
    .overview-grid { grid-template-columns: 1fr; gap: var(--space-2xl); }
    .overview-facts { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 767px) {
    .subcat-grid { grid-template-columns: 1fr; gap: var(--space-lg); }
    .data-grid { grid-template-columns: 1fr; }
    .hydro-articles .content-grid { grid-template-columns: 1fr; gap: var(--space-lg); }
    .tracks-mini-grid { grid-template-columns: 1fr; }
    .overview-grid { grid-template-columns: 1fr; gap: var(--space-2xl); }
    .overview-facts { grid-template-columns: 1fr; }
    .hydro-hero-stats { gap: var(--space-xl); }
    .data-card .chart-container { height: 220px; }
}