:root {
    /* Colors - Dark Mode Default */
    --bg-body: #09090b;
    --bg-card: #18181b;
    --bg-card-hover: #27272a;
    --bg-input: #27272a;
    
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    
    --border-color: #3f3f46;
    
    /* Accents */
    --accent-primary: #06b6d4; /* Cyan */
    --accent-secondary: #8b5cf6; /* Purple */
    --accent-gradient: linear-gradient(135deg, #06b6d4 0%, #8b5cf6 100%);
    
    /* Status */
    --status-success: #10b981;
    --status-warning: #f59e0b;
    
    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 48px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-card: 0 10px 25px -5px rgba(0,0,0,0.3);
    --shadow-glow: 0 0 20px rgba(6, 182, 212, 0.2);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-body);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    min-height: 100vh;
    line-height: 1.5;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    margin-top: 0;
    font-weight: 700;
    letter-spacing: -0.02em;
}

h1 { font-size: 3rem; line-height: 1.1; margin-bottom: var(--space-lg); }
h2 { font-size: 2rem; margin-bottom: var(--space-md); }
h3 { font-size: 1.5rem; margin-bottom: var(--space-sm); }
p { margin-bottom: var(--space-md); color: var(--text-secondary); }

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--accent-secondary);
}

/* Layout */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    width: 100%;
}

.section {
    padding: var(--space-xl) 0;
}

/* Navigation */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(9, 9, 11, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: var(--space-md) 0;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: var(--space-lg);
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #fff;
    box-shadow: 0 4px 14px rgba(6, 182, 212, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(6, 182, 212, 0.4);
    color: #fff;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    border-color: var(--accent-primary);
    background: var(--bg-card);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.875rem;
}

.btn-block {
    width: 100%;
}

/* Forms */
.form-group {
    margin-bottom: var(--space-md);
}

.form-label {
    display: block;
    margin-bottom: var(--space-sm);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.form-input {
    width: 100%;
    padding: 12px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(6, 182, 212, 0.2);
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: transform 0.2s, border-color 0.2s;
}

.card:hover {
    border-color: var(--text-secondary);
}

.card-hover:hover {
    transform: translateY(-4px);
    background: var(--bg-card-hover);
}

.card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
    background: var(--bg-input);
    position: relative;
    overflow: hidden;
}

/* Hero Section */
.hero {
    padding: 80px 0;
    text-align: center;
    background: radial-gradient(circle at top right, rgba(139, 92, 246, 0.1), transparent 40%),
                radial-gradient(circle at bottom left, rgba(6, 182, 212, 0.1), transparent 40%);
}

.search-widget {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    margin-top: var(--space-xl);
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-md);
    align-items: end;
}

/* Grid Layouts */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-lg); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-lg); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-lg); }

/* Badges */
.badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.badge-primary { background: rgba(6, 182, 212, 0.2); color: var(--accent-primary); }
.badge-secondary { background: rgba(139, 92, 246, 0.2); color: var(--accent-secondary); }

/* Placeholders */
.placeholder-image {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #27272a 0%, #3f3f46 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}
.placeholder-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-input);
}
.placeholder-icon {
    width: 24px;
    height: 24px;
    background: var(--text-secondary);
    mask-size: contain;
    -webkit-mask-size: contain;
    mask-repeat: no-repeat;
    -webkit-mask-repeat: no-repeat;
    display: inline-block;
}

/* Seat Map Specifics */
.plane-body {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 100px 100px 20px 20px;
    padding: 60px 40px;
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
    position: relative;
}

.cockpit {
    height: 60px;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 40px;
}

.seat-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
}

.seat-group {
    display: flex;
    gap: 8px;
}

.aisle {
    width: 30px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.seat {
    width: 36px;
    height: 36px;
    border-radius: 6px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
}

.seat:hover {
    border-color: var(--accent-primary);
}

.seat.selected {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    box-shadow: 0 0 10px rgba(6, 182, 212, 0.4);
}

.seat.occupied {
    background: #3f3f46;
    cursor: not-allowed;
    opacity: 0.5;
}

/* Flight List Item */
.flight-item {
    display: grid;
    grid-template-columns: 1fr 2fr 1fr 1fr;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    border-bottom: 1px solid var(--border-color);
}
.flight-item:last-child { border-bottom: none; }

.flight-route {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.flight-time {
    text-align: center;
}
.flight-time h4 { margin: 0; }
.flight-time span { font-size: 0.875rem; color: var(--text-secondary); }

/* Profile Layout */
.profile-grid {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--space-lg);
}

@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .search-widget { grid-template-columns: 1fr; }
    .profile-grid { grid-template-columns: 1fr; }
    .flight-item { grid-template-columns: 1fr; text-align: center; }
    .flight-route { justify-content: center; }
}