/* Fuel Tracker — Mobile-first dark theme */

:root {
    --bg: #0f1923;
    --bg-card: #1a2733;
    --bg-hover: #243444;
    --text: #e8edf2;
    --text-muted: #8899aa;
    --accent-diesel: #4facfe;
    --accent-diesel-bg: rgba(79, 172, 254, 0.12);
    --accent-gas: #f5a623;
    --accent-gas-bg: rgba(245, 166, 35, 0.12);
    --green: #34d399;
    --red: #f87171;
    --border: #2a3a4a;
    --radius: 12px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    min-height: 100dvh;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 16px;
}

/* Header */
header {
    text-align: center;
    padding: 20px 0 8px;
}

header h1 {
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

header h1 span {
    color: var(--text-muted);
    font-weight: 400;
    font-size: 0.85em;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.82rem;
    margin-top: 2px;
}

/* Summary cards */
.summary {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin: 20px 0;
}

.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 16px;
    border: 1px solid var(--border);
}

.card-label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    margin-bottom: 4px;
    font-weight: 600;
}

.card-price {
    font-size: 1.7rem;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.card-price.diesel { color: var(--accent-diesel); }
.card-price.gasoline { color: var(--accent-gas); }

.card-change {
    font-size: 0.78rem;
    margin-top: 4px;
    font-weight: 500;
}

.card-change.up { color: var(--red); }
.card-change.down { color: var(--green); }
.card-change.flat { color: var(--text-muted); }

.card-date {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 2px;
}

/* Chart area */
.chart-section {
    margin: 20px 0;
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 8px;
}

.chart-title {
    font-size: 1rem;
    font-weight: 600;
}

.range-selector {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

.range-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 5px 12px;
    border-radius: 8px;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
    font-family: var(--font);
}

.range-btn:hover {
    background: var(--bg-hover);
    color: var(--text);
}

.range-btn.active {
    background: var(--accent-diesel);
    color: #0f1923;
    border-color: var(--accent-diesel);
}

.chart-container {
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    padding: 16px 12px;
    position: relative;
}

.chart-container canvas {
    width: 100% !important;
    max-height: 400px;
}

/* Brand table */
.brands-section {
    margin: 20px 0 40px;
}

.brands-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.brand-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
}

.brand-table th {
    text-align: left;
    padding: 10px 14px;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    font-weight: 600;
    border-bottom: 1px solid var(--border);
}

.brand-table td {
    padding: 10px 14px;
    font-size: 0.85rem;
    border-bottom: 1px solid var(--border);
}

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

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

.brand-name {
    font-weight: 600;
    text-transform: capitalize;
}

.price-diesel { color: var(--accent-diesel); font-weight: 600; }
.price-gasoline { color: var(--accent-gas); font-weight: 600; }

/* Chart controls */
.chart-controls {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.chart-toggles {
    display: flex;
    gap: 10px;
}

.toggle-label {
    font-size: 0.72rem;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    user-select: none;
}

.toggle-label input[type="checkbox"] {
    accent-color: var(--accent-diesel);
    cursor: pointer;
}

/* Model info bar */
.model-info {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 8px;
    padding: 6px 12px;
    background: rgba(26, 39, 51, 0.6);
    border-radius: 6px;
    display: none;
}

.model-info.visible {
    display: block;
}

.model-info .confidence-badge {
    display: inline-block;
    padding: 1px 6px;
    border-radius: 4px;
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-left: 6px;
}

.confidence-badge.high { background: rgba(52, 211, 153, 0.2); color: var(--green); }
.confidence-badge.medium { background: rgba(245, 166, 35, 0.2); color: var(--accent-gas); }
.confidence-badge.low { background: rgba(248, 113, 113, 0.2); color: var(--red); }

/* Forecast card addition */
.card-forecast {
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.card-forecast .forecast-value {
    font-weight: 600;
}

.card-forecast .forecast-up { color: var(--red); }
.card-forecast .forecast-down { color: var(--green); }

/* Loading / error states */
.loading {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.loading-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border);
    border-top-color: var(--accent-diesel);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 12px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.error {
    text-align: center;
    padding: 40px 20px;
    color: var(--red);
    font-size: 0.9rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 20px 0 32px;
    color: var(--text-muted);
    font-size: 0.7rem;
}

footer a {
    color: var(--accent-diesel);
    text-decoration: none;
}

/* Responsive */
@media (min-width: 600px) {
    .container {
        padding: 24px;
    }
    header h1 {
        font-size: 1.7rem;
    }
    .card-price {
        font-size: 2rem;
    }
    .chart-container {
        padding: 20px;
    }
}