/* ============================================================
   BTS Insights Microsite — UAL Flight Tracker
   Dashboard-style layout, denser than the main app, same brand.
   ============================================================ */

:root {
    /* Brand (mirrored from main site for consistency) */
    --ua-navy: #002244;
    --ua-navy-deep: #001529;
    --ua-navy-light: #003366;
    --ua-blue: #0066CC;
    --ua-blue-light: #0088FF;
    --ua-blue-glow: #0099FF;
    --ua-gold: #FFBF00;
    --ua-gold-dim: #CC9900;

    /* Neutrals */
    --gray-100: #F1F5F9;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-400: #94A3B8;
    --gray-500: #64748B;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1E293B;
    --gray-900: #0F172A;

    /* Semantic */
    --success: #22C55E;
    --warning: #F59E0B;
    --danger: #EF4444;

    /* Surfaces */
    --bg-deep: #00101F;
    --bg-page: #00172B;
    --surface: rgba(0, 32, 64, 0.55);
    --surface-strong: rgba(0, 38, 76, 0.75);
    --surface-elevated: rgba(0, 50, 96, 0.5);
    --border: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.14);

    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 6px 18px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.55);
}

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

html, body {
    background:
        radial-gradient(ellipse at top, rgba(0, 102, 204, 0.15) 0%, transparent 45%),
        radial-gradient(ellipse at bottom right, rgba(255, 191, 0, 0.06) 0%, transparent 50%),
        linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-page) 100%);
    background-attachment: fixed;
    color: var(--gray-100);
    font-family: var(--font-primary);
    font-size: 14px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
}

a { color: var(--ua-blue-light); text-decoration: none; }
a:hover { color: var(--ua-blue-glow); }

/* ---------- Top Bar ---------- */
.topbar {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(0, 16, 31, 0.85);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--border);
}

.topbar-inner {
    max-width: 1480px;
    margin: 0 auto;
    padding: 14px 32px;
    display: flex;
    align-items: center;
    gap: 24px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--gray-100);
    font-weight: 600;
    letter-spacing: 0.01em;
    font-size: 15px;
}

.brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--ua-blue) 0%, var(--ua-navy-light) 100%);
    color: var(--ua-gold);
    font-weight: 800;
    font-size: 12px;
    border-radius: var(--radius-sm);
    box-shadow: 0 0 0 1px var(--border-strong);
    letter-spacing: 0.02em;
}

.brand-divider {
    color: var(--gray-500);
    font-weight: 400;
}

.brand-section {
    color: var(--ua-gold);
    font-weight: 600;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.topnav {
    display: flex;
    gap: 4px;
    margin-left: 24px;
    flex: 1;
    flex-wrap: wrap;
}

.topnav a {
    color: var(--gray-400);
    padding: 6px 11px;
    font-size: 13px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: color 150ms, background 150ms;
}

.topnav a:hover {
    color: var(--gray-100);
    background: var(--surface);
}

.topbar-meta {
    display: flex;
    align-items: center;
    gap: 12px;
}

.meta-pill {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--gray-300);
    padding: 5px 10px;
    border-radius: var(--radius-full, 9999px);
    font-size: 12px;
    font-feature-settings: "tnum";
}

.topbar-back {
    background: rgba(0, 102, 204, 0.15);
    border: 1px solid rgba(0, 102, 204, 0.35);
    color: var(--ua-blue-light);
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
}

.topbar-back:hover {
    background: rgba(0, 102, 204, 0.3);
    color: var(--gray-100);
}

/* ---------- Layout ---------- */
.dashboard {
    max-width: 1480px;
    margin: 0 auto;
    padding: 40px 32px 80px;
    display: flex;
    flex-direction: column;
    gap: 56px;
}

.section {
    scroll-margin-top: 90px;
}

.section-head {
    margin-bottom: 18px;
}

.section-head h2 {
    color: var(--gray-100);
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 6px;
    letter-spacing: -0.01em;
}

.section-head p {
    color: var(--gray-400);
    font-size: 14px;
    max-width: 720px;
}

/* ---------- Hero ---------- */
.hero {
    display: grid;
    grid-template-columns: 1.05fr 1fr;
    gap: 32px;
    align-items: stretch;
    grid-template-areas:
        "text kpis"
        "chart chart";
    scroll-margin-top: 90px;
}

.hero-text { grid-area: text; padding: 8px 0; }
.kpi-grid { grid-area: kpis; }
.hero-chart { grid-area: chart; }

.hero h1 {
    font-size: 40px;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #ffffff 0%, var(--ua-blue-light) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-text p {
    color: var(--gray-300);
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: 8px;
}

.hero-source {
    color: var(--gray-500);
    font-size: 12px;
    margin-top: 12px;
}

.kpi-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.kpi-tile {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px 18px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    transition: transform 200ms, border-color 200ms, background 200ms;
}

.kpi-tile:hover {
    transform: translateY(-2px);
    background: var(--surface-strong);
    border-color: var(--border-strong);
}

.kpi-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--gray-400);
    font-weight: 600;
}

.kpi-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--gray-100);
    font-feature-settings: "tnum";
    line-height: 1.1;
}

.kpi-trend {
    font-size: 12px;
    color: var(--gray-400);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.kpi-trend.up { color: var(--success); }
.kpi-trend.down { color: var(--danger); }
.kpi-trend.flat { color: var(--gray-400); }

/* ---------- Cards ---------- */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px 22px;
    box-shadow: var(--shadow-sm);
}

.card-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: 14px;
    gap: 12px;
}

.card-head h3 {
    color: var(--gray-100);
    font-size: 16px;
    font-weight: 600;
}

.card-sub {
    color: var(--gray-500);
    font-size: 12px;
    font-feature-settings: "tnum";
}

.badge {
    font-size: 11px;
    padding: 3px 9px;
    border-radius: var(--radius-full, 9999px);
    font-weight: 600;
    letter-spacing: 0.02em;
}

.badge-success {
    background: rgba(34, 197, 94, 0.15);
    color: var(--success);
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.badge-danger {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

canvas { width: 100%; display: block; }

/* ---------- Recovery ---------- */
.recovery-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    margin-top: 18px;
    padding-top: 18px;
    border-top: 1px solid var(--border);
}

.recovery-stat {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.recovery-stat-label {
    font-size: 11px;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.recovery-stat-value {
    font-size: 20px;
    font-weight: 600;
    color: var(--gray-100);
    font-feature-settings: "tnum";
}

/* ---------- Hub Grid ---------- */
.hub-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(305px, 1fr));
    gap: 14px;
}

.hub-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 18px 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    position: relative;
    transition: transform 200ms, border-color 200ms;
}

.hub-card:hover {
    transform: translateY(-2px);
    border-color: var(--ua-blue);
}

.hub-card-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

.hub-code {
    font-size: 22px;
    font-weight: 800;
    color: var(--ua-gold);
    letter-spacing: 0.04em;
    font-feature-settings: "tnum";
}

.hub-rank {
    font-size: 11px;
    color: var(--gray-500);
    background: rgba(255, 255, 255, 0.05);
    padding: 3px 8px;
    border-radius: var(--radius-full, 9999px);
}

.hub-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px 12px;
}

.hub-stat-label {
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--gray-500);
}

.hub-stat-value {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-100);
    font-feature-settings: "tnum";
}

.hub-spark {
    border-top: 1px solid var(--border);
    padding-top: 10px;
}

.hub-yoy {
    font-size: 12px;
    font-weight: 600;
    font-feature-settings: "tnum";
}

.hub-yoy.up { color: var(--success); }
.hub-yoy.down { color: var(--danger); }
.hub-yoy.flat { color: var(--gray-400); }

/* ---------- Routes Table ---------- */
.routes-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 14px;
    flex-wrap: wrap;
}

#routesSearch {
    flex: 1;
    min-width: 240px;
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    color: var(--gray-100);
    padding: 9px 14px;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 14px;
    transition: border-color 150ms, background 150ms;
}

#routesSearch::placeholder { color: var(--gray-500); }

#routesSearch:focus {
    outline: none;
    border-color: var(--ua-blue);
    background: rgba(0, 50, 100, 0.55);
}

.routes-stats {
    color: var(--gray-400);
    font-size: 13px;
    font-feature-settings: "tnum";
}

.routes-table-wrap {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: rgba(0, 16, 31, 0.35);
}

.routes-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.routes-table th {
    text-align: left;
    color: var(--gray-400);
    font-weight: 600;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 12px 14px;
    background: rgba(0, 16, 31, 0.7);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
}

.routes-table th.sort-col {
    cursor: pointer;
    user-select: none;
    transition: color 150ms;
}

.routes-table th.sort-col:hover { color: var(--gray-100); }

.routes-table th.sort-active { color: var(--ua-blue-light); }

.routes-table th.sort-active::after {
    content: " ↓";
    opacity: 0.7;
}

.routes-table th.sort-active.sort-asc::after { content: " ↑"; }

.routes-table td {
    padding: 9px 14px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    color: var(--gray-200);
    font-feature-settings: "tnum";
}

.routes-table tbody tr:hover { background: rgba(0, 102, 204, 0.08); }
.routes-table tbody tr:last-child td { border-bottom: none; }

.route-cell {
    color: var(--gray-100);
    font-weight: 600;
}

.lf-cell {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.lf-bar {
    display: inline-block;
    height: 6px;
    background: linear-gradient(90deg, var(--ua-blue) 0%, var(--ua-blue-light) 100%);
    border-radius: 999px;
    min-width: 4px;
}

.routes-paging {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    margin-top: 16px;
}

.routes-paging button {
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    color: var(--gray-200);
    padding: 7px 16px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    transition: background 150ms, border-color 150ms;
}

.routes-paging button:hover:not(:disabled) {
    background: rgba(0, 102, 204, 0.25);
    border-color: var(--ua-blue);
    color: var(--gray-100);
}

.routes-paging button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

#routesPagingLabel {
    color: var(--gray-400);
    font-size: 13px;
    font-feature-settings: "tnum";
    min-width: 140px;
    text-align: center;
}

/* ---------- Growth / Decline ---------- */
.growth-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}

.growth-list {
    display: flex;
    flex-direction: column;
}

.growth-row {
    display: grid;
    grid-template-columns: 1fr auto auto;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.growth-row:last-child { border-bottom: none; }

.growth-route {
    color: var(--gray-100);
    font-weight: 600;
    font-size: 14px;
}

.growth-route-meta {
    color: var(--gray-500);
    font-size: 11px;
    font-feature-settings: "tnum";
    margin-top: 2px;
}

.growth-pax {
    color: var(--gray-300);
    font-size: 12px;
    font-feature-settings: "tnum";
    text-align: right;
}

.growth-rate {
    font-size: 14px;
    font-weight: 700;
    font-feature-settings: "tnum";
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    text-align: center;
    min-width: 72px;
}

.growth-rate.up { background: rgba(34, 197, 94, 0.15); color: var(--success); }
.growth-rate.down { background: rgba(239, 68, 68, 0.15); color: var(--danger); }

/* ---------- Seasonality ---------- */
.seasonal-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-top: 18px;
    padding-top: 18px;
    border-top: 1px solid var(--border);
}

.seasonal-stat-label {
    font-size: 11px;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.seasonal-stat-value {
    font-size: 18px;
    font-weight: 600;
    color: var(--gray-100);
    font-feature-settings: "tnum";
    margin-top: 4px;
}

/* ---------- Heatmap ---------- */
.heatmap-wrap {
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 8px;
}

.heatmap-row {
    display: contents;
}

.heatmap-label {
    color: var(--ua-gold);
    font-weight: 700;
    font-size: 13px;
    padding: 6px 0;
    align-self: center;
    text-align: right;
    padding-right: 8px;
    font-feature-settings: "tnum";
}

.heatmap-cells {
    display: grid;
    grid-template-columns: repeat(24, 1fr);
    gap: 3px;
    min-width: 720px;
}

.heatmap-cell {
    aspect-ratio: 1;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.04);
    position: relative;
    cursor: default;
    transition: transform 100ms;
}

.heatmap-cell:hover {
    transform: scale(1.4);
    z-index: 10;
    box-shadow: 0 0 0 2px var(--ua-gold);
}

.heatmap-cell[data-tip]:hover::after {
    content: attr(data-tip);
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-deep);
    border: 1px solid var(--border-strong);
    color: var(--gray-100);
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    font-size: 11px;
    white-space: nowrap;
    pointer-events: none;
    z-index: 100;
    font-feature-settings: "tnum";
}

.heatmap-months {
    display: grid;
    grid-template-columns: repeat(24, 1fr);
    gap: 3px;
    margin-top: 6px;
    color: var(--gray-500);
    font-size: 9px;
    font-feature-settings: "tnum";
    text-align: center;
    min-width: 720px;
}

.heatmap-legend {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 14px;
    color: var(--gray-400);
    font-size: 11px;
}

.heatmap-gradient {
    flex: 1;
    height: 8px;
    border-radius: 4px;
    background: linear-gradient(90deg,
        hsl(220, 60%, 30%) 0%,
        hsl(180, 60%, 40%) 35%,
        hsl(60, 80%, 50%) 70%,
        hsl(20, 90%, 55%) 100%
    );
    max-width: 340px;
}

/* ---------- Market Position ---------- */
.market-grid {
    display: grid;
    grid-template-columns: 1fr 1.4fr;
    gap: 18px;
}

.carrier-bars {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.carrier-row {
    display: grid;
    grid-template-columns: 80px 1fr 90px;
    align-items: center;
    gap: 12px;
}

.carrier-name {
    font-weight: 600;
    font-size: 14px;
}

.carrier-name.ua { color: var(--ua-gold); }

.carrier-track {
    background: rgba(255, 255, 255, 0.05);
    height: 22px;
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.carrier-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--ua-blue) 0%, var(--ua-blue-light) 100%);
    transition: width 600ms cubic-bezier(0.16, 1, 0.3, 1);
    border-radius: 4px;
}

.carrier-row.ua .carrier-fill {
    background: linear-gradient(90deg, var(--ua-gold-dim) 0%, var(--ua-gold) 100%);
}

.carrier-pax {
    text-align: right;
    color: var(--gray-200);
    font-feature-settings: "tnum";
    font-weight: 600;
    font-size: 13px;
}

/* ---------- Footer ---------- */
.site-footer {
    text-align: center;
    padding-top: 28px;
    margin-top: 16px;
    border-top: 1px solid var(--border);
    color: var(--gray-500);
    font-size: 12px;
    line-height: 1.7;
}

.footer-meta {
    margin-top: 4px;
    color: var(--gray-600);
}

/* ---------- Loading / Empty States ---------- */
.skeleton {
    background: linear-gradient(90deg, rgba(255,255,255,0.04) 25%, rgba(255,255,255,0.09) 50%, rgba(255,255,255,0.04) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.6s infinite;
    border-radius: var(--radius-sm);
}

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

.empty-state {
    padding: 40px;
    text-align: center;
    color: var(--gray-500);
    font-size: 13px;
}

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
    .hero {
        grid-template-columns: 1fr;
        grid-template-areas:
            "text"
            "kpis"
            "chart";
    }
    .hero h1 { font-size: 32px; }
    .growth-grid, .market-grid { grid-template-columns: 1fr; }
    .topnav { display: none; }
}

@media (max-width: 640px) {
    .dashboard { padding: 24px 16px 60px; gap: 40px; }
    .topbar-inner { padding: 12px 16px; }
    .section-head h2 { font-size: 22px; }
    .kpi-grid { grid-template-columns: 1fr 1fr; }
    .kpi-value { font-size: 22px; }
    .hero h1 { font-size: 26px; }
    .hub-grid { grid-template-columns: 1fr; }
    .recovery-stats, .seasonal-summary { grid-template-columns: 1fr 1fr; }
    .brand-name { display: none; }
}