:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent: #38bdf8;
    --danger: #ef4444;
    --success: #22c55e;
    --water: #0ea5e9;
    --ocean: #1a3a5c;
    --land: #3d5a3d;
    --shelf: #fbbf24;
}

body {
    margin: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    min-height: 100vh;
}

#app {
    width: 100%;
    max-width: 1200px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

header {
    text-align: center;
    margin-bottom: 10px;
}

header h1 {
    font-weight: 700;
    letter-spacing: -0.05em;
    margin: 0;
    color: var(--accent);
}

header p {
    color: var(--text-secondary);
    margin-top: 5px;
}

main {
    display: grid;
    grid-template-columns: 1fr 250px;
    gap: 20px;
}

#map-container {
    background: var(--ocean);
    border-radius: 12px;
    height: 500px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    display: flex;
    align-items: center;
    justify-content: center;
}

#stats-panel {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.stat-card {
    background: var(--card-bg);
    padding: 15px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.stat-card h3 {
    margin: 0 0 5px 0;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-card div {
    font-size: 1.5rem;
    font-weight: 600;
}

#controls {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 20px;
    justify-content: center;
}

/* Charts Section */
#charts {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.chart-container {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.chart-container h3 {
    margin: 0 0 10px 0;
    font-size: 1rem;
    color: var(--text-secondary);
}

.chart-container svg {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 4px;
}

button {
    background: var(--accent);
    color: #000;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: filter 0.2s;
}

button:hover:not(:disabled) {
    filter: brightness(1.1);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Summary Statistics */
#summary-stats {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
}

#summary-stats h3 {
    margin: 0 0 15px 0;
    font-size: 1rem;
    color: var(--text-secondary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent);
}

@media (max-width: 800px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

#log-container {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    max-height: 400px;
    overflow-y: auto;
}

.log-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.log-header h3 {
    margin: 0;
}

.sort-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
}

.sort-controls label {
    color: var(--text-secondary);
}

.sort-btn {
    background: transparent;
    border: 1px solid var(--text-secondary);
    color: var(--text-primary);
    padding: 4px 10px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.75rem;
    transition: all 0.2s;
}

.sort-btn:hover {
    border-color: var(--accent);
}

.sort-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #000;
}

#event-log {
    list-style: none;
    padding: 0;
    margin: 0;
    font-size: 0.9rem;
    font-family: monospace;
}

#event-log li {
    padding: 4px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.log-land {
    color: var(--danger);
}

.log-water {
    color: var(--water);
}

/* SVG Map Styles */
.land-path {
    fill: #1a3a5c;
    /* Actually drawing ocean */
    fill-rule: evenodd;
    stroke: none;
}

.water-bg {
    fill: var(--bg-color);
}

.drop-point {
    stroke: #fff;
    stroke-width: 1px;
    opacity: 0.8;
}

/* Charts Axis */
.domain,
.tick line {
    stroke: rgba(255, 255, 255, 0.2);
}

.tick text {
    fill: rgba(255, 255, 255, 0.6);
}

@media (max-width: 800px) {
    main {
        grid-template-columns: 1fr;
    }

    #map-container {
        height: 300px;
    }

    #charts {
        grid-template-columns: 1fr;
    }
}

/* Legend */
#legend {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 15px 20px;
}

#legend h3 {
    margin: 0 0 10px 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.legend-items {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.coastal {
    background: #ef4444;
}

.dot.shelf {
    background: #fbbf24;
}

.dot.far {
    background: #22c55e;
}

.dot.deep {
    background: #334155;
}

/* Map Button */
.map-btn {
    background: transparent;
    border: 1px solid var(--text-secondary);
    color: var(--text-primary);
    padding: 2px 6px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.75rem;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.map-btn:hover {
    opacity: 1;
    background: rgba(255, 255, 255, 0.1);
}

/* Clickable drop points */
.drop-point {
    transition: r 0.2s;
}

.drop-point:hover {
    r: 5 !important;
}

/* Filter Indicator */
#filter-indicator {
    display: none;
    align-items: center;
    gap: 8px;
    background: rgba(56, 189, 248, 0.2);
    border: 1px solid var(--accent);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
}

#filter-indicator button {
    background: transparent;
    border: none;
    color: var(--accent);
    cursor: pointer;
    padding: 0 4px;
    font-size: 1rem;
}

#filter-indicator button:hover {
    color: #fff;
}

/* Histogram bars hover */
#chart-temp rect:hover,
#chart-dist rect:hover {
    filter: brightness(1.2);
}