@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url('/fonts/Inter-Regular.woff2') format('woff2');
}

@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 500;
    font-display: swap;
    src: url('/fonts/Inter-Medium.woff2') format('woff2');
}

@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 600;
    font-display: swap;
    src: url('/fonts/Inter-SemiBold.woff2') format('woff2');
}

@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 700;
    font-display: swap;
    src: url('/fonts/Inter-Bold.woff2') format('woff2');
}

:root {
    --color-good: #10b981;
    --color-good-text: #ffffff;
    --color-moderate: #f59e0b;
    --color-moderate-text: #1a1a1a;
    --color-unhealthy: #ef4444;
    --color-unhealthy-text: #ffffff;
    --color-hazardous: #8b5cf6;
    --color-hazardous-text: #ffffff;
    
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-border: #e2e8f0;
    --color-text: #0f172a;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;
    
    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    
    --radius-sm: 8px;
    --radius-md: 10px;
    --radius-lg: 12px;
    --radius-full: 9999px;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 2px 4px 0 rgb(0 0 0 / 0.1);
    --shadow-lg: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    
    --safe-area-top: env(safe-area-inset-top);
    --safe-area-bottom: env(safe-area-inset-bottom);
    --safe-area-left: env(safe-area-inset-left);
    --safe-area-right: env(safe-area-inset-right);
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #0f172a;
        --color-surface: #1e293b;
        --color-border: #334155;
        --color-text: #f1f5f9;
        --color-text-secondary: #94a3b8;
        --color-text-muted: #64748b;
        
        --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
        --shadow-md: 0 2px 4px 0 rgb(0 0 0 / 0.3);
        --shadow-lg: 0 4px 6px -1px rgb(0 0 0 / 0.3);
    }
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    min-height: 100vh;
    overflow-x: hidden;
    padding-top: var(--safe-area-top);
    padding-bottom: calc(var(--safe-area-bottom) + 60px);
    touch-action: pan-y;
}

input, select, textarea {
    font-size: 16px;
}

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px var(--spacing-lg);
    gap: var(--spacing-md);
    max-width: 800px;
    margin: 0 auto;
}

.app-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text);
}

.location-badge {
    background: var(--color-primary);
    color: white;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 500;
    white-space: nowrap;
}

.refresh-btn {
    width: 36px;
    height: 36px;
    min-width: 44px;
    min-height: 44px;
    border-radius: var(--radius-full);
    background: transparent;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

.refresh-btn:active {
    transform: scale(0.95);
    background: var(--color-border);
}

.refresh-icon {
    width: 20px;
    height: 20px;
    stroke: var(--color-text);
}

.refresh-btn.spinning .refresh-icon {
    animation: spin 1s linear infinite;
}

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

.main {
    flex: 1;
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-lg);
    padding-bottom: var(--spacing-xl);
}

.loading-state {
    padding: var(--spacing-lg) 0;
}

.hero-skeleton {
    height: 200px;
    background: linear-gradient(90deg, var(--color-surface) 0%, var(--color-border) 50%, var(--color-surface) 100%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.skeleton-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.skeleton-card {
    height: 80px;
    background: linear-gradient(90deg, var(--color-surface) 0%, var(--color-border) 50%, var(--color-surface) 100%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-md);
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.error-state {
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
}

.error-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--spacing-lg);
    stroke: var(--color-text-secondary);
}

.error-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.error-message {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    font-size: 15px;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
    border: none;
    padding: 12px 24px;
    min-height: 44px;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 15px;
    cursor: pointer;
}

.btn-primary:active {
    background: var(--color-primary-hover);
}

.btn-link {
    background: none;
    border: none;
    color: var(--color-primary);
    font-weight: 500;
    cursor: pointer;
    text-decoration: underline;
    font-size: 13px;
    padding: 4px 8px;
    min-height: 44px;
}

.status-banner {
    background: var(--color-moderate);
    color: var(--color-moderate-text);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    font-size: 13px;
}

.status-banner.offline {
    background: var(--color-unhealthy);
    color: var(--color-unhealthy-text);
}

.status-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

#statusMessage {
    flex: 1;
}

.hero-section {
    background: var(--color-good);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    position: relative;
    overflow: hidden;
}

.hero-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
    gap: var(--spacing-sm);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 11px;
    font-weight: 500;
    white-space: nowrap;
}

.hero-badge svg {
    width: 12px;
    height: 12px;
    flex-shrink: 0;
}

.hero-distance {
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 11px;
    font-weight: 500;
    white-space: nowrap;
}

.hero-main {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.hero-aqi {
    font-size: 64px;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 4px;
}

.hero-level {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.hero-advice {
    font-size: 13px;
    line-height: 1.4;
    opacity: 0.9;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.stat-card {
    text-align: center;
    padding: var(--spacing-sm);
}

.stat-label {
    font-size: 11px;
    margin-bottom: 2px;
    font-weight: 500;
    opacity: 0.8;
}

.stat-value {
    font-size: 20px;
    font-weight: 700;
    line-height: 1;
}

.stat-unit {
    display: block;
    font-size: 10px;
    opacity: 0.7;
    margin-top: 2px;
}

.hero-footer {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid;
    border-color: currentColor;
    opacity: 0.5;
}

.hero-station-name {
    font-size: 12px;
    margin-bottom: 2px;
}

.hero-time {
    font-size: 11px;
}

.list-view {
    margin-bottom: var(--spacing-lg);
}

.list-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
    gap: var(--spacing-md);
}

.list-title {
    font-size: 18px;
    font-weight: 600;
}

.sort-select {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: 6px 10px;
    border-radius: var(--radius-md);
    font-size: 13px;
    color: var(--color-text);
    cursor: pointer;
    min-height: 44px;
}

.map-view {
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    bottom: calc(60px + var(--safe-area-bottom));
    z-index: 10;
}

.map {
    width: 100%;
    height: 100%;
}

.stations-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.station-item {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.station-item.stale {
    opacity: 0.6;
}

.station-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.station-indicator {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 16px;
    flex-shrink: 0;
    box-shadow: var(--shadow-sm);
}

.station-info {
    flex: 1;
    min-width: 0;
}

.station-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 2px;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.station-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 12px;
    color: var(--color-text-secondary);
}

.station-meta-item {
    display: flex;
    align-items: center;
    gap: 4px;
    white-space: nowrap;
}

.station-meta-item svg {
    width: 12px;
    height: 12px;
    flex-shrink: 0;
}

.station-measurements {
    display: flex;
    gap: var(--spacing-lg);
    font-size: 12px;
}

.measurement-item {
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.measurement-label {
    color: var(--color-text-secondary);
    font-weight: 500;
}

.measurement-value {
    color: var(--color-text);
    font-weight: 600;
}

.info-section {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.section-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

.aqi-legend {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.legend-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.legend-indicator {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.legend-indicator.good { background: var(--color-good); }
.legend-indicator.moderate { background: var(--color-moderate); }
.legend-indicator.unhealthy { background: var(--color-unhealthy); }
.legend-indicator.hazardous { background: var(--color-hazardous); }

.legend-content {
    flex: 1;
}

.legend-label {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 2px;
}

.legend-range {
    font-size: 12px;
    color: var(--color-text-secondary);
}

.footer {
    text-align: center;
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
}

.footer-text {
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-bottom: 4px;
}

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

.footer-updated {
    font-size: 12px;
    color: var(--color-text-muted);
}

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    display: flex;
    z-index: 1000;
    padding-bottom: var(--safe-area-bottom);
}

.nav-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    padding: 8px;
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    font-size: 11px;
    font-weight: 500;
    cursor: pointer;
    min-height: 60px;
}

.nav-btn svg {
    width: 22px;
    height: 22px;
    stroke: currentColor;
}

.nav-btn.active {
    color: var(--color-primary);
}

.hidden {
    display: none !important;
}

.leaflet-control-attribution {
    font-size: 10px !important;
}

.leaflet-popup-content-wrapper {
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    background: var(--color-surface);
}

.leaflet-popup-content {
    margin: var(--spacing-md);
    color: var(--color-text);
}

.popup-header {
    margin-bottom: var(--spacing-md);
}

.popup-station-name {
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 4px;
}

.popup-level {
    display: inline-block;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 500;
}

.popup-measurements {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin: var(--spacing-md) 0;
}

.popup-measurement {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
}

.popup-measurement-label {
    color: var(--color-text-secondary);
    font-weight: 500;
}

.popup-measurement-value {
    font-weight: 600;
}

.popup-time {
    font-size: 12px;
    color: var(--color-text-muted);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-border);
}

@media (min-width: 768px) {
    .bottom-nav {
        display: none;
    }
    
    body {
        padding-bottom: 0;
    }
    
    .map-view {
        position: relative;
        top: auto;
        left: auto;
        right: auto;
        bottom: auto;
        height: 500px;
        margin-bottom: var(--spacing-lg);
    }
}