/* ============================================
   ocean-currents.css — 海洋洋流页面专用样式
   ============================================ */

/* ---- Hero ---- */
.oc-hero {
    min-height: 75vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(160deg, #001529 0%, #002b4d 25%, #004d7a 55%, #0077be 85%, #4fc3f7 100%);
    padding-top: 72px;
}

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

.oc-hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    max-width: 860px;
    padding: 0 var(--space-lg);
}

.oc-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background: rgba(255,255,255,0.08);
    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;
}

.oc-hero-badge .dot {
    width: 8px; height: 8px;
    background: #4fc3f7;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.oc-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);
}

.oc-hero-title .highlight {
    background: linear-gradient(135deg, #4fc3f7, #81d4fa, #b3e5fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.oc-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: 680px;
    margin-left: auto;
    margin-right: auto;
}

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

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

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

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

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

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

.oc-overview-text h2 {
    font-family: var(--font-heading);
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: var(--space-lg);
    color: var(--color-text);
}

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

.oc-overview-text strong {
    color: var(--color-text);
}

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

.oc-fact {
    background: linear-gradient(135deg, #E3F2FD, #BBDEFB);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    border-left: 3px solid var(--color-secondary);
}

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

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

.oc-overview-visual {
    position: relative;
    background: linear-gradient(135deg, #001529, #002b4d);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    min-height: 360px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

/* ---- Types Section ---- */
.oc-types {
    background: var(--color-bg);
    padding: var(--space-4xl) 0;
}

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

.type-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;
}

.type-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);
}

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

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

.type-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);
}

.type-card:nth-child(1) .type-icon { background: linear-gradient(135deg, #E3F2FD, #BBDEFB); }
.type-card:nth-child(2) .type-icon { background: linear-gradient(135deg, #E0F7FA, #B2EBF2); }
.type-card:nth-child(3) .type-icon { background: linear-gradient(135deg, #FFF3E0, #FFE0B2); }
.type-card:nth-child(4) .type-icon { background: linear-gradient(135deg, #E8F5E9, #C8E6C9); }

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

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

.type-details {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin-bottom: var(--space-md);
}

.type-details dt {
    font-weight: 600;
    color: var(--color-secondary-dark);
    font-size: 0.875rem;
    margin-bottom: 2px;
}

.type-details dd {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    line-height: 1.6;
    margin-bottom: var(--space-sm);
    margin-left: 0;
}

.type-details dd:last-child { margin-bottom: 0; }

/* ---- Major Currents Map ---- */
.oc-currents-map {
    background: var(--color-card);
    padding: var(--space-4xl) 0;
}

.map-container {
    background: linear-gradient(180deg, #001529 0%, #002b4d 50%, #003d5c 100%);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    position: relative;
    overflow: hidden;
}

.map-container canvas {
    width: 100%;
    height: 520px;
    display: block;
}

.map-legend {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    margin-top: var(--space-lg);
    flex-wrap: wrap;
}

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

.legend-dot {
    width: 14px; height: 14px;
    border-radius: 50%;
}

.legend-dot.warm { background: linear-gradient(135deg, #FF6F00, #FF9800); }
.legend-dot.cold { background: linear-gradient(135deg, #0277BD, #4FC3F7); }
.legend-dot.equator { background: linear-gradient(135deg, #2E7D32, #4CAF50); }

/* ---- ENSO Section ---- */
.oc-enso {
    background: var(--color-bg);
    padding: var(--space-4xl) 0;
}

.enso-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

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

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

.enso-card canvas {
    width: 100%;
    height: 260px;
    display: block;
}

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

.enso-desc h3 {
    font-family: var(--font-heading);
    margin-bottom: var(--space-md);
}

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

.enso-desc p:last-child { margin-bottom: 0; }

.enso-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--space-md);
    font-size: 0.9375rem;
}

.enso-table th,
.enso-table td {
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    border-bottom: 1px solid var(--color-border-light);
}

.enso-table th {
    background: var(--color-sky);
    color: var(--color-secondary-dark);
    font-weight: 600;
    font-size: 0.875rem;
}

.enso-table td {
    color: var(--color-text-secondary);
}

.enso-table tr:hover td {
    background: var(--color-bg);
}

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

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

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

.data-card-full 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-full .chart-container {
    width: 100%;
    height: 300px;
    position: relative;
}

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

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

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

/* ---- Currents Detail Cards ---- */
.currents-detail {
    background: var(--color-card);
    padding: var(--space-4xl) 0;
}

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

.current-item {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    border: 1px solid var(--color-border-light);
    transition: var(--transition-base);
    position: relative;
}

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

.current-item .current-tag {
    display: inline-block;
    font-size: 0.75rem;
    padding: 2px 10px;
    border-radius: var(--radius-full);
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.current-item .current-tag.warm {
    background: #FFF3E0;
    color: #E65100;
}

.current-item .current-tag.cold {
    background: #E3F2FD;
    color: #01579B;
}

.current-item h4 {
    font-family: var(--font-heading);
    font-size: 1.0625rem;
    margin-bottom: var(--space-sm);
}

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

.current-item .current-meta {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    border-top: 1px solid var(--color-border-light);
    padding-top: var(--space-sm);
    margin-top: var(--space-sm);
}

/* ---- Responsive ---- */
@media (min-width: 1024px) and (max-width: 1439px) {
    .types-grid { grid-template-columns: repeat(2, 1fr); }
    .data-grid-2 { grid-template-columns: repeat(2, 1fr); }
    .enso-grid { grid-template-columns: 1fr 1fr; }
    .currents-list { grid-template-columns: repeat(2, 1fr); }
    .oc-overview-grid { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .types-grid { grid-template-columns: 1fr; gap: var(--space-lg); }
    .data-grid-2 { grid-template-columns: 1fr; }
    .enso-grid { grid-template-columns: 1fr; }
    .currents-list { grid-template-columns: repeat(2, 1fr); gap: var(--space-lg); }
    .oc-overview-grid { grid-template-columns: 1fr; gap: var(--space-2xl); }
    .oc-facts-grid { grid-template-columns: repeat(2, 1fr); }
    .map-container canvas { height: 400px; }
}

@media (max-width: 767px) {
    .types-grid { grid-template-columns: 1fr; gap: var(--space-lg); }
    .data-grid-2 { grid-template-columns: 1fr; }
    .enso-grid { grid-template-columns: 1fr; }
    .currents-list { grid-template-columns: 1fr; gap: var(--space-lg); }
    .oc-overview-grid { grid-template-columns: 1fr; gap: var(--space-2xl); }
    .oc-facts-grid { grid-template-columns: 1fr; }
    .oc-hero-stats { gap: var(--space-xl); }
    .map-container { padding: var(--space-md); }
    .map-container canvas { height: 300px; }
    .map-legend { gap: var(--space-md); }
    .data-card-full .chart-container { height: 240px; }
}