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

:root {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-card: rgba(255, 255, 255, 0.1);
    --bg-card-hover: rgba(255, 255, 255, 0.15);
    --border-color: rgba(255, 255, 255, 0.1);
    --border-color-hover: rgba(255, 255, 255, 0.3);
    --text-primary: #fff;
    --text-secondary: #a0a0a0;
    --text-muted: #606060;
    --accent-color: #00d4ff;
    --accent-bg: rgba(0, 212, 255, 0.2);
    --success-color: #4ade80;
    --danger-color: #f87171;
    --warning-color: #facc15;
    --popup-bg: rgba(26, 26, 46, 0.95);
}

body.light-mode {
    --bg-primary: #f5f7fa;
    --bg-secondary: #e8ecf1;
    --bg-card: rgba(255, 255, 255, 0.9);
    --bg-card-hover: rgba(255, 255, 255, 1);
    --border-color: rgba(0, 0, 0, 0.1);
    --border-color-hover: rgba(0, 0, 0, 0.2);
    --text-primary: #1a1a2e;
    --text-secondary: #5a5a6e;
    --text-muted: #8a8a9a;
    --accent-color: #0099cc;
    --accent-bg: rgba(0, 153, 204, 0.15);
    --popup-bg: rgba(255, 255, 255, 0.98);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-primary);
    transition: background 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

h1 {
    font-size: 2rem;
    margin-bottom: 10px;
    color: var(--accent-color);
}

.date {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 20px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: background 0.3s ease, border-color 0.3s ease;
}

.stat-card.min {
    border-color: var(--success-color);
}

.stat-card.max {
    border-color: var(--danger-color);
}

.stat-card.current {
    border-color: var(--accent-color);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
}

.stat-card.min .stat-value {
    color: var(--success-color);
}

.stat-card.max .stat-value {
    color: var(--danger-color);
}

.stat-card.current .stat-value {
    color: var(--accent-color);
}

.stat-hour {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 5px;
}

.chart-container {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 25px;
    border: 1px solid var(--border-color);
    transition: background 0.3s ease, border-color 0.3s ease;
}

.chart-wrapper {
    position: relative;
    height: 400px;
}

.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 400px;
    font-size: 1.2rem;
    color: var(--text-secondary);
}

.error {
    text-align: center;
    padding: 40px;
    color: var(--danger-color);
}

.unit {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

footer {
    text-align: center;
    margin-top: 30px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

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

.day-selector {
    display: none;
    justify-content: center;
    gap: 10px;
    margin-bottom: 25px;
}

.day-selector.visible {
    display: flex;
}

.day-btn {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    color: var(--text-secondary);
    padding: 12px 24px;
    border-radius: 10px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.day-btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-color-hover);
}

.day-btn.active {
    background: var(--accent-bg);
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.tomorrow-badge {
    background: var(--accent-color);
    color: var(--bg-primary);
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: 4px;
    margin-left: 8px;
    font-weight: bold;
}

/* Main Navigation Tabs */
.main-nav {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 30px;
}

.main-tab {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    color: var(--text-secondary);
    padding: 15px 30px;
    border-radius: 12px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
}

.main-tab:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-color-hover);
}

.main-tab.active {
    background: var(--accent-bg);
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.main-tab svg {
    width: 24px;
    height: 24px;
}

/* Section visibility */
.section {
    display: none;
}

.section.active {
    display: block;
}

/* Gas Stations Section */
#gas-section .stats {
    margin-bottom: 20px;
}

#map-container {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 15px;
    border: 1px solid var(--border-color);
    margin-bottom: 20px;
    transition: background 0.3s ease, border-color 0.3s ease;
}

#map {
    height: 500px;
    border-radius: 15px;
    z-index: 1;
}

.fuel-filter {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.fuel-btn {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    color: var(--text-secondary);
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.fuel-btn:hover {
    background: var(--bg-card-hover);
}

.fuel-btn.active {
    background: var(--accent-bg);
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.gas-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.leaflet-popup-content-wrapper {
    background: var(--popup-bg);
    color: var(--text-primary);
    border-radius: 10px;
    border: 1px solid var(--accent-color);
}

.leaflet-popup-tip {
    background: var(--popup-bg);
}

.leaflet-popup-content {
    margin: 12px;
}

.popup-title {
    font-weight: bold;
    color: var(--accent-color);
    margin-bottom: 8px;
    font-size: 1rem;
}

.popup-address {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 10px;
}

.popup-prices {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.popup-price {
    display: flex;
    justify-content: space-between;
    gap: 15px;
}

.popup-price-label {
    color: var(--text-secondary);
}

.popup-price-value {
    color: var(--success-color);
    font-weight: bold;
}

.gas-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 500px;
    color: var(--text-secondary);
}

.gas-loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--accent-bg);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 15px;
}

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

.cache-info {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-top: 10px;
}

/* Theme Toggle Switch */
.header-top {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 10px;
}

.theme-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
}

.theme-icon {
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.theme-icon.sun {
    color: var(--warning-color);
}

.theme-icon.moon {
    color: var(--text-secondary);
}

body.light-mode .theme-icon.sun {
    color: var(--text-secondary);
}

body.light-mode .theme-icon.moon {
    color: #6366f1;
}

/* Switch Toggle */
.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    transition: 0.3s;
    border-radius: 26px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 2px;
    bottom: 2px;
    background: var(--accent-color);
    transition: 0.3s;
    border-radius: 50%;
}

input:checked + .slider {
    background: var(--accent-bg);
    border-color: var(--accent-color);
}

input:checked + .slider:before {
    transform: translateX(24px);
}