/* ============================================
   AirQ Global - Professional Air Quality Dashboard
   ============================================ */

:root {
    /* Dark theme (default) */
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-tertiary: #1a2035;
    --bg-card: #151c2e;
    --bg-card-hover: #1c2540;
    --bg-input: #0d1220;
    --border-primary: #1e293b;
    --border-secondary: #2a3654;
    --border-accent: #3b82f6;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --accent-glow: rgba(59, 130, 246, 0.15);
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.5);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --transition: 0.2s ease;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

[data-theme="light"] {
    --bg-primary: #f0f2f5;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f8fafc;
    --bg-card: #ffffff;
    --bg-card-hover: #f1f5f9;
    --bg-input: #f1f5f9;
    --border-primary: #e2e8f0;
    --border-secondary: #cbd5e1;
    --border-accent: #3b82f6;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
}

/* ---- Reset & Base ---- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow: hidden;
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 13px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
    position: fixed;
    top: 0;
    left: 0;
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-secondary); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ---- Top Bar ---- */
.top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 48px;
    padding: 0 16px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-primary);
    flex-shrink: 0;
    z-index: 100;
}

.top-bar__left, .top-bar__right {
    display: flex;
    align-items: center;
    gap: 16px;
}

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

.logo__icon {
    width: 24px;
    height: 24px;
    color: var(--accent);
}

.logo__text {
    font-size: 15px;
    font-weight: 700;
    letter-spacing: -0.3px;
}

.logo__accent {
    color: var(--accent);
}

.top-nav {
    display: flex;
    gap: 2px;
    margin-left: 16px;
}

.top-nav__item {
    padding: 6px 14px;
    border: none;
    background: none;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 12.5px;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.top-nav__item:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.top-nav__item.active {
    color: var(--accent);
    background: var(--accent-glow);
}

/* Search */
.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box__icon {
    position: absolute;
    left: 10px;
    width: 14px;
    height: 14px;
    color: var(--text-muted);
    pointer-events: none;
}

.search-box__input {
    width: 220px;
    padding: 6px 12px 6px 32px;
    background: var(--bg-input);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 12px;
    transition: all var(--transition);
}

.search-box__input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-glow);
    width: 280px;
}

.search-box__input::placeholder {
    color: var(--text-muted);
}

.search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-top: 4px;
    background: var(--bg-card);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    max-height: 300px;
    overflow-y: auto;
    display: none;
    z-index: 1000;
}

.search-results.active {
    display: block;
}

.search-results__item {
    padding: 10px 14px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: background var(--transition);
    border-bottom: 1px solid var(--border-primary);
}

.search-results__item:last-child {
    border-bottom: none;
}

.search-results__item:hover {
    background: var(--bg-card-hover);
}

.search-results__city {
    font-weight: 500;
    font-size: 12.5px;
}

.search-results__country {
    color: var(--text-muted);
    font-size: 11px;
    margin-left: 6px;
}

.search-results__aqi {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 4px;
}

/* Status */
.status-indicator {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    color: var(--success);
}

.status-indicator__dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--success);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(16,185,129,0.4); }
    50% { opacity: 0.7; box-shadow: 0 0 0 4px rgba(16,185,129,0); }
}

.last-update {
    font-size: 11px;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: 1px solid var(--border-primary);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}

.btn-icon svg {
    width: 16px;
    height: 16px;
}

.btn-icon:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-glow);
}

/* ---- Main Content ---- */
.main-content {
    display: grid;
    grid-template-columns: 280px 1fr 320px;
    flex: 1;
    overflow: hidden;
    gap: 0;
}

/* ---- Sidebars ---- */
.sidebar {
    overflow-y: auto;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-primary);
}

.sidebar--right {
    border-right: none;
    border-left: 1px solid var(--border-primary);
}

/* ---- Metric Cards ---- */
.metric-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    padding: 14px;
    transition: all var(--transition);
}

.metric-card:hover {
    border-color: var(--border-secondary);
    box-shadow: var(--shadow-sm);
}

.metric-card--global-aqi {
    background: linear-gradient(135deg, var(--bg-card) 0%, rgba(59,130,246,0.05) 100%);
    border-color: rgba(59,130,246,0.2);
}

.metric-card__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}

.metric-card__label {
    font-size: 11px;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.metric-card__badge {
    font-size: 10px;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
}

.metric-card__badge--up {
    background: rgba(239,68,68,0.15);
    color: #ef4444;
}

.metric-card__badge--down {
    background: rgba(16,185,129,0.15);
    color: #10b981;
}

.metric-card__value {
    font-size: 36px;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -1px;
    font-family: var(--font-mono);
}

.metric-card__value--sm {
    font-size: 26px;
}

.metric-card__status {
    font-size: 12px;
    font-weight: 500;
    margin-top: 2px;
}

.metric-card__sub {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 2px;
}

.metric-card__sparkline {
    margin-top: 10px;
}

/* ---- Pollutant Bars ---- */
.pollutant-breakdown {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    padding: 14px;
}

.section-title {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}

.pollutant-bars {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.pollutant-bar__header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 3px;
}

.pollutant-bar__name {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-primary);
    font-family: var(--font-mono);
}

.pollutant-bar__value {
    font-size: 11px;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.pollutant-bar__track {
    height: 4px;
    background: var(--bg-input);
    border-radius: 2px;
    overflow: hidden;
}

.pollutant-bar__fill {
    height: 100%;
    border-radius: 2px;
    transition: width 0.8s ease;
    width: 0%;
}

.pollutant-bar__fill--pm25 { background: linear-gradient(90deg, #ef4444, #f97316); }
.pollutant-bar__fill--pm10 { background: linear-gradient(90deg, #f59e0b, #eab308); }
.pollutant-bar__fill--o3 { background: linear-gradient(90deg, #06b6d4, #3b82f6); }
.pollutant-bar__fill--no2 { background: linear-gradient(90deg, #8b5cf6, #a855f7); }
.pollutant-bar__fill--so2 { background: linear-gradient(90deg, #ec4899, #f43f5e); }
.pollutant-bar__fill--co { background: linear-gradient(90deg, #64748b, #94a3b8); }

/* ---- AQI Legend ---- */
.aqi-legend {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    padding: 14px;
}

.aqi-legend__items {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.aqi-legend__item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 11px;
    color: var(--text-secondary);
}

.aqi-legend__color {
    width: 12px;
    height: 12px;
    border-radius: 3px;
    flex-shrink: 0;
}

/* ---- Map ---- */
.map-container {
    position: relative;
    overflow: hidden;
}

.map {
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
}

/* Leaflet overrides */
.leaflet-container {
    background: var(--bg-primary) !important;
    font-family: var(--font-sans) !important;
}

.leaflet-control-zoom {
    border: 1px solid var(--border-secondary) !important;
    border-radius: var(--radius-sm) !important;
    overflow: hidden;
}

.leaflet-control-zoom a {
    background: var(--bg-card) !important;
    color: var(--text-primary) !important;
    border-bottom: 1px solid var(--border-primary) !important;
    width: 30px !important;
    height: 30px !important;
    line-height: 30px !important;
    font-size: 14px !important;
}

.leaflet-control-zoom a:hover {
    background: var(--bg-card-hover) !important;
}

.leaflet-popup-content-wrapper {
    background: var(--bg-card) !important;
    color: var(--text-primary) !important;
    border: 1px solid var(--border-secondary) !important;
    border-radius: var(--radius-md) !important;
    box-shadow: var(--shadow-lg) !important;
    font-family: var(--font-sans) !important;
}

.leaflet-popup-tip {
    background: var(--bg-card) !important;
    border: 1px solid var(--border-secondary) !important;
}

.leaflet-popup-close-button {
    color: var(--text-muted) !important;
}

/* Map Controls */
.map-controls {
    position: absolute;
    top: 12px;
    left: 60px;
    z-index: 500;
    display: flex;
    gap: 8px;
}

.map-controls__layer-group {
    display: flex;
    background: var(--bg-card);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-sm);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.map-layer-btn {
    padding: 6px 12px;
    border: none;
    background: none;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    border-right: 1px solid var(--border-primary);
}

.map-layer-btn:last-child {
    border-right: none;
}

.map-layer-btn:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.map-layer-btn.active {
    background: var(--accent);
    color: #fff;
}

/* AQI Marker */
.aqi-marker {
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    font-weight: 700;
    color: #fff;
    border: 2px solid rgba(255,255,255,0.3);
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    text-shadow: 0 1px 2px rgba(0,0,0,0.5);
}

.aqi-marker:hover {
    transform: scale(1.3);
    box-shadow: 0 4px 16px rgba(0,0,0,0.4);
    z-index: 1000 !important;
}

/* City Detail Panel */
.city-detail-panel {
    position: absolute;
    bottom: 16px;
    left: 16px;
    width: 360px;
    background: var(--bg-card);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-lg);
    padding: 18px;
    box-shadow: var(--shadow-lg);
    z-index: 500;
    display: none;
    backdrop-filter: blur(10px);
}

.city-detail-panel.active {
    display: block;
    animation: slideUp 0.25s ease;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

.city-detail-panel__close {
    position: absolute;
    top: 10px;
    right: 14px;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 20px;
    cursor: pointer;
    line-height: 1;
}

.city-detail-panel__close:hover {
    color: var(--text-primary);
}

.city-detail-panel__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 6px;
}

.city-detail-panel__name {
    font-size: 16px;
    font-weight: 700;
}

.city-detail-panel__aqi-badge {
    font-family: var(--font-mono);
    font-size: 20px;
    font-weight: 800;
    padding: 4px 12px;
    border-radius: var(--radius-sm);
}

.city-detail-panel__status {
    font-size: 12px;
    font-weight: 500;
    margin-bottom: 12px;
}

.city-detail-panel__pollutants {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    margin-bottom: 12px;
}

.pollutant-chip {
    background: var(--bg-input);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    padding: 6px 8px;
    text-align: center;
}

.pollutant-chip__name {
    display: block;
    font-size: 9px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.pollutant-chip__value {
    display: block;
    font-size: 14px;
    font-weight: 700;
    font-family: var(--font-mono);
    margin-top: 1px;
}

.city-detail-panel__chart {
    margin-bottom: 10px;
}

.city-detail-panel__health {
    font-size: 11px;
    color: var(--text-secondary);
    line-height: 1.6;
    padding: 10px;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--accent);
}

/* ---- Right Panel ---- */
.panel {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.panel__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-primary);
}

.panel__title {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
}

.panel__toggle {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    padding: 2px;
}

.panel__toggle svg {
    width: 14px;
    height: 14px;
}

/* City List */
.city-list {
    max-height: 200px;
    overflow-y: auto;
}

.city-list__loading {
    padding: 16px;
    text-align: center;
    color: var(--text-muted);
    font-size: 12px;
}

.city-list__item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 14px;
    border-bottom: 1px solid var(--border-primary);
    cursor: pointer;
    transition: background var(--transition);
}

.city-list__item:last-child {
    border-bottom: none;
}

.city-list__item:hover {
    background: var(--bg-card-hover);
}

.city-list__rank {
    width: 22px;
    font-size: 11px;
    font-weight: 600;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.city-list__info {
    flex: 1;
    min-width: 0;
}

.city-list__name {
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.city-list__country {
    font-size: 10px;
    color: var(--text-muted);
}

.city-list__aqi {
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
    min-width: 44px;
    text-align: center;
}

/* Chart Container */
.chart-container {
    padding: 12px;
}

/* Advisory List */
.advisory-list {
    max-height: 180px;
    overflow-y: auto;
}

.advisory-item {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-primary);
    display: flex;
    gap: 10px;
    align-items: flex-start;
}

.advisory-item:last-child {
    border-bottom: none;
}

.advisory-item__icon {
    font-size: 14px;
    flex-shrink: 0;
    margin-top: 1px;
}

.advisory-item__content {
    flex: 1;
}

.advisory-item__title {
    font-size: 11.5px;
    font-weight: 600;
    margin-bottom: 2px;
}

.advisory-item__text {
    font-size: 10.5px;
    color: var(--text-muted);
    line-height: 1.4;
}

/* ---- Bottom Bar ---- */
.bottom-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 28px;
    padding: 0 16px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-primary);
    font-size: 11px;
    color: var(--text-muted);
    flex-shrink: 0;
}

.bottom-bar__left, .bottom-bar__right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.bottom-bar__sep {
    color: var(--border-secondary);
}

.bottom-bar__center {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-muted);
}

/* ---- Loading Overlay ---- */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    transition: opacity 0.4s ease;
}

.loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-overlay__content {
    text-align: center;
}

.loading-overlay__content p {
    margin-top: 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.loading-overlay__sub {
    font-size: 12px !important;
    color: var(--text-muted) !important;
    margin-top: 6px !important;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-secondary);
    border-top-color: var(--accent);
    border-radius: 50%;
    margin: 0 auto;
    animation: spin 0.8s linear infinite;
}

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

/* ---- AQI Color Utilities ---- */
.aqi-good { background: rgba(0,228,0,0.15); color: #00e400; }
.aqi-moderate { background: rgba(255,255,0,0.12); color: #c5c500; }
.aqi-usg { background: rgba(255,126,0,0.15); color: #ff7e00; }
.aqi-unhealthy { background: rgba(255,0,0,0.15); color: #ff0000; }
.aqi-very-unhealthy { background: rgba(143,63,151,0.15); color: #8f3f97; }
.aqi-hazardous { background: rgba(126,0,35,0.2); color: #7e0023; }

/* Popup content */
.popup-content {
    min-width: 180px;
}

.popup-content__header {
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 4px;
}

.popup-content__aqi {
    font-family: var(--font-mono);
    font-size: 28px;
    font-weight: 800;
    margin: 6px 0;
}

.popup-content__status {
    font-size: 12px;
    font-weight: 500;
    margin-bottom: 8px;
}

.popup-content__pollutants {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px;
    font-size: 11px;
}

.popup-content__pollutant {
    display: flex;
    justify-content: space-between;
    padding: 2px 0;
}

.popup-content__pollutant-name {
    color: var(--text-muted);
}

.popup-content__pollutant-value {
    font-family: var(--font-mono);
    font-weight: 600;
}

/* ---- Responsive ---- */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 240px 1fr 280px;
    }
}

@media (max-width: 960px) {
    .main-content {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr;
    }
    .sidebar--left, .sidebar--right {
        display: none;
    }
    .top-nav {
        display: none;
    }
    .search-box__input {
        width: 160px;
    }
}