/**
 * Rail 24 — Phase 3 UI
 * Dual brand: Rail (emerald) + Flight (cobalt/indigo)
 */

:root {
    /* Flight domain */
    --flight-color: #3b82f6;
    --flight-dark: #2563eb;
    --flight-light: #60a5fa;
    --flight-muted: rgba(59, 130, 246, 0.15);
    --flight-glow: 0 0 24px rgba(59, 130, 246, 0.28);
    --gradient-flight: linear-gradient(135deg, #60a5fa 0%, #2563eb 100%);

    /* Active domain (switched via body.domain-rail | body.domain-flight) */
    --domain-color: var(--primary-color);
    --domain-dark: var(--primary-dark);
    --domain-muted: rgba(16, 185, 129, 0.12);
    --domain-border: var(--border-accent);
    --domain-glow: var(--shadow-glow);
}

body.domain-flight {
    --domain-color: var(--flight-color);
    --domain-dark: var(--flight-dark);
    --domain-muted: var(--flight-muted);
    --domain-border: rgba(59, 130, 246, 0.45);
    --domain-glow: var(--flight-glow);
    --text-accent: var(--flight-light);
    --gradient-bg:
        radial-gradient(ellipse 70% 45% at 20% -10%, rgba(16, 185, 129, 0.05) 0%, transparent 55%),
        radial-gradient(ellipse 55% 40% at 95% 0%, rgba(59, 130, 246, 0.12) 0%, transparent 50%),
        radial-gradient(ellipse 50% 35% at 80% 100%, rgba(59, 130, 246, 0.06) 0%, transparent 45%);
}

body.domain-rail {
    --gradient-bg:
        radial-gradient(ellipse 75% 50% at 30% -15%, rgba(16, 185, 129, 0.08) 0%, transparent 55%),
        radial-gradient(ellipse 50% 40% at 100% 80%, rgba(59, 130, 246, 0.05) 0%, transparent 50%);
}

body {
    transition: background-color 0.35s ease;
}

/* —— App shell header —— */
.header {
    background: rgba(12, 18, 34, 0.82);
    border-bottom: 1px solid var(--border-divider);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.04);
}

.header-container {
    padding: var(--space-3) var(--space-6);
    gap: var(--space-4);
}

.logo-section {
    gap: var(--space-3);
    text-decoration: none;
    color: inherit;
}

.logo-mark {
    position: relative;
    width: 44px;
    height: 44px;
    border-radius: 14px;
    background: linear-gradient(145deg, rgba(16, 185, 129, 0.2), rgba(59, 130, 246, 0.2));
    border: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.logo-mark__rail {
    font-size: 18px;
    color: var(--primary-light);
    position: absolute;
    left: 9px;
    top: 11px;
}

.logo-mark__flight {
    font-size: 14px;
    color: var(--flight-light);
    position: absolute;
    right: 8px;
    bottom: 9px;
    opacity: 0.95;
}

.logo-text h1 {
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.15;
    background: linear-gradient(90deg, var(--primary-light) 0%, var(--flight-light) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-tagline {
    display: block;
    font-size: 11px;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.02em;
    margin-top: 2px;
}

/* Search */
.search-bar-container {
    max-width: 520px;
}

.search-input {
    padding: 11px 48px 11px 16px;
    border-radius: 999px;
    background: var(--bg-surface);
    border-color: var(--border-divider);
}

.search-input:focus {
    border-color: var(--domain-color);
    box-shadow: 0 0 0 3px var(--domain-muted);
}

.search-btn {
    border-radius: 999px;
    width: 34px;
    height: 34px;
    background: var(--domain-color);
}

.search-btn:hover {
    background: var(--domain-dark);
}

body.domain-flight .search-btn {
    background: var(--flight-color);
}

body.domain-flight .search-btn:hover {
    background: var(--flight-dark);
}

/* Header actions */
.header-actions {
    gap: var(--space-2);
}

.btn-signup {
    background: var(--gradient-primary);
    border: none;
    box-shadow: var(--shadow);
}

body.domain-flight .btn-signup {
    background: var(--gradient-flight);
}

.btn-adfree {
    border-radius: 999px;
    font-size: 12px;
    padding: 8px 14px;
}

/* —— Navigation shell —— */
.nav-shell {
    position: sticky;
    top: 73px;
    z-index: 999;
    background: rgba(12, 18, 34, 0.75);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-divider);
}

.nav-shell__inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-2) var(--space-6);
    display: flex;
    align-items: center;
    gap: var(--space-4);
    flex-wrap: nowrap;
}

.nav-group--rail {
    flex: 1;
    min-width: 0;
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.nav-group__label {
    display: none;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--primary-light);
    white-space: nowrap;
    gap: 6px;
    align-items: center;
}

.nav-tabs.nav-tabs--rail,
.nav-tabs.rail-tabs {
    background: var(--bg-surface);
    border: 1px solid var(--border-divider);
    border-radius: 999px;
    padding: 4px;
    gap: 2px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    flex: 1;
    min-width: 0;
    border-bottom: none;
    margin: 0;
}

.nav-tabs.nav-tabs--rail::-webkit-scrollbar,
.nav-tabs.rail-tabs::-webkit-scrollbar {
    display: none;
}

.nav-tab {
    padding: 8px 14px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    border: 1px solid transparent;
    transition:
        color var(--transition-fast),
        background var(--transition-fast),
        box-shadow var(--transition-fast),
        border-color var(--transition-fast);
}

.nav-tab i {
    font-size: 12px;
    opacity: 0.85;
}

.nav-tab:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.06);
}

.nav-tab.active {
    color: #fff;
    background: var(--gradient-primary);
    border-color: transparent;
    box-shadow: var(--shadow-glow);
}

.nav-tab[data-tab="live-map"].active {
    background: var(--gradient-primary);
}

/* Flight tab — separated pill */
.nav-group--flight {
    flex-shrink: 0;
}

.nav-tab--flight {
    padding: 10px 20px;
    border-radius: 999px;
    background: var(--bg-surface);
    border: 1px solid rgba(59, 130, 246, 0.35);
    color: var(--flight-light);
    font-weight: 700;
    gap: 8px;
    box-shadow: none;
}

.nav-tab--flight:hover {
    background: var(--flight-muted);
    border-color: var(--flight-color);
    color: #fff;
}

.nav-tab--flight.active {
    background: var(--gradient-flight);
    border-color: transparent;
    color: #fff;
    box-shadow: var(--flight-glow);
}

/* Domain accent on primary buttons when in flight mode */
body.domain-flight .rail-btn--primary {
    background: var(--gradient-flight);
}

body.domain-flight .rail-btn--primary:hover {
    filter: brightness(1.08);
}

body.domain-flight button:focus-visible,
body.domain-flight input:focus-visible,
body.domain-flight select:focus-visible {
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.35);
}

/* Cards & forms */
.rail-card,
.search-card {
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-divider);
    background: var(--bg-card);
    box-shadow: var(--shadow);
}

.rail-card h2,
.search-card h2 {
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-2);
}

.search-card .description {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: var(--space-5);
}

.rail-card:hover {
    border-color: var(--border-light);
    box-shadow: var(--shadow-md);
}

.find-trains-container,
.train-info-container,
.live-status-container,
.availability-container,
.pnr-status-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: var(--space-6) var(--space-6) var(--space-8);
}

/* Flight tab content accent */
body.domain-flight #flight-tab .search-card h2 i,
body.domain-flight #flight-tab h2 i.fa-plane-departure {
    color: var(--flight-light);
}

#flight-tab.active ~ * {
    /* noop */
}

#flight-tab .glass-panel {
    border-color: rgba(59, 130, 246, 0.2);
}

/* Footer */
footer[role="contentinfo"],
body > footer {
    background: var(--bg-darker);
    border-top: 1px solid var(--border-divider);
}

footer a:hover {
    color: var(--domain-color) !important;
}

/* Loading overlay */
.loading-overlay {
    backdrop-filter: blur(6px);
    background: rgba(12, 18, 34, 0.75);
}

.loader {
    border-top-color: var(--domain-color);
}

/* Ad-free modal gem uses domain-agnostic purple — keep */

/* Light theme tweaks */
[data-theme="light"] .header {
    background: rgba(255, 255, 255, 0.9);
}

[data-theme="light"] .nav-shell {
    background: rgba(255, 255, 255, 0.92);
}

[data-theme="light"] .nav-tabs.nav-tabs--rail {
    background: #f1f5f9;
}

[data-theme="light"] .nav-tab.active:not(.nav-tab--flight) {
    color: #fff;
}

[data-theme="light"] .nav-tab--flight {
    background: #eff6ff;
    border-color: rgba(59, 130, 246, 0.35);
}

[data-theme="light"] .nav-tab--flight.active {
    color: #fff;
}

[data-theme="light"] .logo-text h1 {
    -webkit-text-fill-color: transparent;
}

/* Map controls follow active domain */
body.domain-flight .map-controls .control-btn:hover {
    border-color: var(--flight-color);
    color: var(--flight-light);
}

body.domain-flight .map-controls .control-btn {
    border-color: rgba(59, 130, 246, 0.25);
}

/* —— Responsive —— */
@media (min-width: 900px) {
    .nav-group__label {
        display: inline-flex;
    }
}

@media (max-width: 768px) {
    .header-container {
        padding: var(--space-3) var(--space-4);
    }

    .logo-tagline {
        display: none;
    }

    .logo-mark {
        width: 40px;
        height: 40px;
    }

    .nav-shell {
        top: 0;
        position: relative;
    }

    .nav-shell__inner {
        flex-direction: column;
        align-items: stretch;
        padding: var(--space-2) var(--space-3);
        gap: var(--space-2);
    }

    .nav-group--rail {
        flex-direction: column;
        align-items: stretch;
    }

    .nav-tabs.nav-tabs--rail {
        border-radius: var(--radius-md);
    }

    .nav-group--flight {
        display: flex;
        justify-content: stretch;
    }

    .nav-tab--flight {
        width: 100%;
        justify-content: center;
    }

    .header-actions .btn-login,
    .header-actions .btn-signup {
        display: none;
    }

    .btn-adfree span,
    .btn-adfree {
        padding: 8px 10px;
    }

    .btn-adfree i {
        margin: 0;
    }

    .find-trains-container,
    .train-info-container,
    .live-status-container,
    .availability-container,
    .pnr-status-container {
        padding: var(--space-4);
    }
}

@media (max-width: 480px) {
    .nav-tab:not(.nav-tab--flight) {
        padding: 8px 12px;
        font-size: 0;
        gap: 0;
    }

    .nav-tab:not(.nav-tab--flight) i {
        font-size: 15px;
        margin: 0;
    }

    .nav-tab--flight {
        font-size: 13px;
    }
}