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

/* ===== LIGHT THEME (default) ===== */
:root,
[data-theme="light"] {
    --bg: #ffffff;
    --bg-alt: #f9fafb;
    --bg-hover: #f3f4f6;
    --bg-selection: #e5e7eb;
    --fg: #1a1a2e;
    --fg-bright: #111827;
    --fg-dim: #6b7280;

    --accent: #1a1a2e;
    --accent-fg: #ffffff;
    --accent-hover: #2d2d4a;

    --frost-blue: #2563eb;
    --frost-teal: #0891b2;
    --frost-lighter: #0284c7;
    --frost-dark: #1e40af;

    --aurora-red: #dc2626;
    --aurora-orange: #d97706;
    --aurora-yellow: #ca8a04;
    --aurora-green: #16a34a;
    --aurora-purple: #9333ea;

    --border: #d1d5db;
    --border-light: #e5e7eb;
    --radius: 6px;

    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'IBM Plex Mono', 'SF Mono', 'Fira Code', monospace;
}

/* ===== SYSTEM THEME (follows OS preference) ===== */
[data-theme="system"] {
    --border: #d1d5db;
    --border-light: #e5e7eb;
    --radius: 6px;
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'IBM Plex Mono', 'SF Mono', 'Fira Code', monospace;
}

@media (prefers-color-scheme: dark) {
    [data-theme="system"] {
        --bg: #2e3440;
        --bg-alt: #3b4252;
        --bg-hover: #434c5e;
        --bg-selection: #4c566a;
        --fg: #d8dee9;
        --fg-bright: #eceff4;
        --fg-dim: #8a9bb5;
        --accent: #5e81ac;
        --accent-fg: #eceff4;
        --accent-hover: #81a1c1;
        --frost-blue: #88c0d0;
        --frost-teal: #8fbcbb;
        --frost-lighter: #81a1c1;
        --frost-dark: #5e81ac;
        --aurora-red: #bf616a;
        --aurora-orange: #d08770;
        --aurora-yellow: #ebcb8b;
        --aurora-green: #a3be8c;
        --aurora-purple: #b48ead;
        --border: #434c5e;
        --border-light: #4c566a;
        --radius: 0;
        --font: 'IBM Plex Mono', 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
        --font-mono: 'IBM Plex Mono', 'SF Mono', 'Fira Code', monospace;
    }
}

/* ===== NORD TERMINAL THEME ===== */
[data-theme="nord"] {
    --bg: #2e3440;
    --bg-alt: #3b4252;
    --bg-hover: #434c5e;
    --bg-selection: #4c566a;
    --fg: #d8dee9;
    --fg-bright: #eceff4;
    --fg-dim: #8a9bb5;

    --accent: #5e81ac;
    --accent-fg: #eceff4;
    --accent-hover: #81a1c1;

    --frost-blue: #88c0d0;
    --frost-teal: #8fbcbb;
    --frost-lighter: #81a1c1;
    --frost-dark: #5e81ac;

    --aurora-red: #bf616a;
    --aurora-orange: #d08770;
    --aurora-yellow: #ebcb8b;
    --aurora-green: #a3be8c;
    --aurora-purple: #b48ead;

    --border: #434c5e;
    --border-light: #4c566a;
    --radius: 0;

    --font: 'IBM Plex Mono', 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    --font-mono: 'IBM Plex Mono', 'SF Mono', 'Fira Code', monospace;
}

/* ===== BASE ===== */
body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--fg);
    line-height: 1.6;
    min-height: 100vh;
    font-size: 14px;
}

::selection { background: var(--bg-selection); color: var(--fg-bright); }
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--bg-selection); border-radius: var(--radius); }

a { color: var(--frost-blue); text-decoration: none; }
a:hover { color: var(--frost-teal); text-decoration: underline; }

/* ===== NAVIGATION ===== */
nav {
    border-bottom: 1px solid var(--border);
    background: var(--bg-alt);
}
.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    height: 48px;
    padding: 0 24px;
    gap: 16px;
}
.nav-brand {
    font-weight: 700;
    font-size: 15px;
    color: var(--fg-bright);
    text-transform: uppercase;
    letter-spacing: 1px;
}
.nav-brand:hover { text-decoration: none; opacity: 0.8; }
.nav-links { display: flex; gap: 4px; }
.nav-link {
    font-size: 13px;
    color: var(--fg-dim);
    padding: 4px 10px;
    border: 1px solid transparent;
}
.nav-link:hover {
    color: var(--fg-bright);
    background: var(--bg-hover);
    text-decoration: none;
    border-color: var(--border);
}
.nav-right { margin-left: auto; display: flex; align-items: center; gap: 8px; }

/* Theme toggle */
.theme-btn {
    background: none;
    border: 1px solid var(--border);
    color: var(--fg-dim);
    cursor: pointer;
    padding: 4px 8px;
    font-size: 14px;
    font-family: inherit;
    line-height: 1;
}
.theme-btn:hover { background: var(--bg-hover); color: var(--fg-bright); }

/* ===== MAIN ===== */
main {
    flex: 1;
    padding: 32px 24px;
    max-width: 1200px;
    margin: 0 auto;
}

/* ===== AUTH ===== */
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 48px - 64px);
}
.auth-card {
    width: 100%;
    max-width: 420px;
    padding: 40px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-alt);
}
.auth-card h1 {
    text-align: center;
    margin-bottom: 32px;
    font-size: 18px;
    color: var(--fg-bright);
    text-transform: uppercase;
    letter-spacing: 2px;
}
.auth-card form { display: flex; flex-direction: column; gap: 16px; }
.auth-link {
    text-align: center;
    margin-top: 20px;
    font-size: 13px;
    color: var(--fg-dim);
}
.auth-link a { text-decoration: underline; }

/* ===== PAGE ===== */
.page { max-width: 1200px; }
.page-narrow { max-width: 800px; }
.page-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}
.page-header h1 {
    flex: 1;
    font-size: 18px;
    margin-bottom: 0;
    color: var(--fg-bright);
    text-transform: uppercase;
    letter-spacing: 1px;
}
h1 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--fg-bright);
    text-transform: uppercase;
    letter-spacing: 1px;
}
h2 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 16px;
    margin-top: 32px;
    color: var(--frost-teal);
    letter-spacing: 0.5px;
}
h3 {
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--frost-lighter);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ===== CARDS ===== */
.card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 16px;
    background: var(--bg-alt);
}

/* ===== STATS ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 24px;
}
.stats-grid-5 { grid-template-columns: repeat(5, 1fr); }
.stat-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    background: var(--bg-alt);
}
.stat-label {
    font-size: 11px;
    color: var(--fg-dim);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.stat-value {
    font-size: 22px;
    font-weight: 700;
    color: var(--aurora-green);
}

/* ===== TABLES ===== */
.table-wrap {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th {
    text-align: left;
    padding: 10px 12px;
    background: var(--bg-alt);
    font-weight: 600;
    color: var(--frost-teal);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 11px;
    border-bottom: 1px solid var(--border);
}
td { padding: 10px 12px; border-top: 1px solid var(--border); }
tr:hover td { background: var(--bg-hover); }
.font-bold { font-weight: 600; color: var(--fg-bright); }
.capitalize { text-transform: capitalize; }

/* ===== FLIGHT LIST ===== */
.flight-list { display: flex; flex-direction: column; gap: 4px; }
.flight-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-alt);
}
.flight-row:hover { background: var(--bg-hover); }
.flight-route { font-weight: 500; color: var(--fg-bright); }
.flight-meta { font-size: 12px; color: var(--fg-dim); margin-top: 2px; }
.flight-role { font-size: 12px; color: var(--fg-dim); }

/* ===== DETAIL ===== */
.detail-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    background: var(--bg-alt);
}
.detail-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}
.detail-grid-4 { grid-template-columns: repeat(4, 1fr); }
.detail-label {
    font-size: 11px;
    color: var(--fg-dim);
    margin-bottom: 2px;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.detail-value { font-weight: 500; color: var(--fg-bright); }
.detail-section {
    border-top: 1px solid var(--border);
    padding-top: 16px;
    margin-top: 16px;
}
.detail-row { font-size: 13px; padding: 2px 0; }

/* ===== FORMS ===== */
.form-group { display: flex; flex-direction: column; gap: 4px; }
.form-group label {
    font-size: 12px;
    font-weight: 500;
    color: var(--fg-dim);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.form-group input, .form-group select, .form-group textarea {
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 13px;
    font-family: inherit;
    background: var(--bg);
    color: var(--fg-bright);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--frost-blue);
    box-shadow: 0 0 0 1px var(--frost-blue);
}
.form-group input::placeholder { color: var(--fg-dim); font-size: 12px; }
.form-hint { font-size: 11px; color: var(--fg-dim); margin-top: 2px; }
.form-hint:hover { color: var(--frost-blue); }
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}
.form-row-4 { grid-template-columns: repeat(4, 1fr); }
.form-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}
.inline-form {
    display: flex;
    gap: 12px;
    align-items: flex-end;
    flex-wrap: wrap;
}
.flex-wrap { flex-wrap: wrap; }
.input-short { width: 120px; }
.flight-form { margin-top: 16px; }

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    padding: 8px 16px;
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-alt);
    color: var(--fg);
    font-family: inherit;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.btn:hover { text-decoration: none; }
.btn-primary {
    background: var(--frost-dark);
    border-color: var(--frost-blue);
    color: var(--accent-fg);
}
.btn-primary:hover { background: var(--frost-lighter); color: var(--bg); }
.btn-secondary {
    background: transparent;
    border-color: var(--border);
    color: var(--fg);
}
.btn-secondary:hover { background: var(--bg-hover); border-color: var(--fg-dim); }
.btn-danger {
    background: transparent;
    border-color: var(--aurora-red);
    color: var(--aurora-red);
}
.btn-danger:hover { background: var(--aurora-red); color: #fff; }
.btn-sm { padding: 4px 10px; font-size: 11px; }
.btn-full { width: 100%; justify-content: center; }
.btn-link-danger {
    background: none;
    border: none;
    color: var(--aurora-red);
    cursor: pointer;
    font-size: 12px;
    font-family: inherit;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.btn-link-danger:hover { color: var(--aurora-orange); }

.export-format-select {
    padding: 6px 8px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 12px;
    background: var(--bg);
    color: var(--fg);
    font-family: inherit;
}

/* ===== FILTER ===== */
.filter-box {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 16px;
    margin-bottom: 16px;
    background: var(--bg-alt);
}
.filter-summary {
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    color: var(--fg-dim);
    text-transform: uppercase;
    letter-spacing: 1px;
}
.filter-form {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 12px;
    align-items: flex-end;
}
.filter-group { display: flex; flex-direction: column; gap: 2px; }
.filter-group label {
    font-size: 11px;
    color: var(--fg-dim);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.filter-group input, .filter-group select {
    padding: 6px 8px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 12px;
    background: var(--bg);
    color: var(--fg);
    font-family: inherit;
}
.filter-group input:focus, .filter-group select:focus {
    border-color: var(--frost-blue);
    outline: none;
}
.filter-group input { width: 140px; }
.filter-actions { display: flex; gap: 8px; align-items: flex-end; padding-bottom: 2px; }

/* ===== ALERTS ===== */
.alert {
    padding: 12px 16px;
    margin-bottom: 16px;
    font-size: 13px;
    border: 1px solid transparent;
    border-radius: var(--radius);
}
.alert-error {
    background: color-mix(in srgb, var(--aurora-red) 12%, transparent);
    border-color: var(--aurora-red);
    color: var(--aurora-red);
}
.alert-warning {
    background: color-mix(in srgb, var(--aurora-yellow) 12%, transparent);
    border-color: var(--aurora-yellow);
    color: var(--aurora-yellow);
}
.status-expired { color: var(--aurora-red); font-weight: 600; }
.status-warning { color: var(--aurora-yellow); font-weight: 600; }
.status-valid { color: var(--aurora-green); font-weight: 600; }

/* ===== REPORTS ===== */
.report-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 16px;
}
.report-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    font-size: 13px;
    border-bottom: 1px solid var(--border);
}
.report-row:last-child { border-bottom: none; }
.report-row span:first-child { color: var(--fg-bright); }

/* Text utilities */
.text-muted { color: var(--fg-dim); }

/* ===== CONFIRM DIALOG ===== */
.confirm-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}
.confirm-dialog {
    background: var(--bg-alt);
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    max-width: 400px;
    width: 90%;
}
.confirm-dialog p { margin-bottom: 16px; color: var(--fg-bright); }
.confirm-dialog .form-actions { margin-top: 0; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-grid-5 { grid-template-columns: repeat(2, 1fr); }
    .form-row { grid-template-columns: 1fr; }
    .form-row-4 { grid-template-columns: repeat(2, 1fr); }
    .detail-grid { grid-template-columns: 1fr; }
    .detail-grid-4 { grid-template-columns: repeat(2, 1fr); }
    .report-grid { grid-template-columns: 1fr; }
    .table-wrap { overflow-x: auto; }
    .nav-inner { gap: 8px; padding: 0 12px; }
    .nav-link { font-size: 12px; padding: 4px 6px; }
    .filter-form { flex-direction: column; align-items: stretch; }
    .filter-group input { width: 100%; }
    main { padding: 16px 12px; }
    .auth-card { padding: 24px; }
    .confirm-dialog { width: 95%; }
}

@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr; }
    .stats-grid-5 { grid-template-columns: 1fr; }
    .form-row-4 { grid-template-columns: 1fr; }
    .detail-grid-4 { grid-template-columns: 1fr; }
    .nav-inner { flex-wrap: wrap; height: auto; padding: 8px 12px; }
    .nav-right { margin-left: 0; width: 100%; justify-content: flex-end; }
    .inline-form { flex-direction: column; align-items: stretch; }
}

/* ===== NORD-SPECIFIC DECORATIONS ===== */
[data-theme="nord"] .stat-value::before,
[data-theme="system"] .stat-value::before {
    content: "> ";
    color: var(--fg-dim);
    font-weight: 400;
    font-size: 14px;
}
[data-theme="nord"] .filter-summary::before,
[data-theme="system"] .filter-summary::before {
    content: "[+] ";
    color: var(--aurora-green);
}
[data-theme="nord"] details[open] .filter-summary::before,
[data-theme="system"] details[open] .filter-summary::before {
    content: "[-] ";
}

@media (prefers-color-scheme: light) {
    [data-theme="system"] .stat-value::before,
    [data-theme="system"] .filter-summary::before {
        content: none;
    }
}