/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Travel-themed Color Palette */
    --primary-blue: #2563eb;
    --primary-blue-dark: #1d4ed8;
    --secondary-orange: #f97316;
    --secondary-orange-dark: #ea580c;
    --accent-green: #059669;
    --accent-red: #dc2626;
    
    /* Neutral Colors */
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--gray-50);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

/* Header Styles */
.header {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-dark) 100%);
    color: var(--white);
    padding: var(--spacing-4) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-4);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--secondary-orange);
}

.logo h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin: 0;
}

.nav {
    display: flex;
    gap: var(--spacing-6);
    flex-wrap: wrap;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-2) var(--spacing-3);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

.nav-link i {
    width: 18px;
    height: 18px;
}

/* Hero Section */
.hero {
    position: relative;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-orange) 100%);
    color: var(--white);
    padding: var(--spacing-20) 0;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0.3;
}

.hero-background::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.8) 0%, rgba(249, 115, 22, 0.8) 100%);
}

.hero-content {
    position: relative;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    margin-bottom: var(--spacing-4);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-8);
    opacity: 0.9;
}

/* Quick Search */
.quick-search {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    padding: var(--spacing-6);
    margin-top: var(--spacing-8);
}

.search-filters {
    display: flex;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-4);
    flex-wrap: wrap;
    justify-content: center;
}

.filter-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
    border: none;
    padding: var(--spacing-3) var(--spacing-4);
    border-radius: var(--radius-lg);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--white);
    color: var(--primary-blue);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.filter-btn i {
    width: 18px;
    height: 18px;
}

.price-filter {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    justify-content: center;
    flex-wrap: wrap;
}

.price-filter label {
    font-weight: 500;
}

.price-filter select {
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: var(--spacing-2) var(--spacing-3);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
}

.price-filter select option {
    background: var(--gray-800);
    color: var(--white);
}

/* Route Overview */
.route-overview {
    padding: var(--spacing-16) 0;
    background: var(--white);
}

.route-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-6);
}

.route-card {
    text-align: center;
    padding: var(--spacing-6);
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-normal);
}

.route-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-blue);
}

.route-card i {
    width: 48px;
    height: 48px;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-3);
}

.route-card h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-2);
    color: var(--gray-700);
}

.route-card p {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-blue);
}

/* Travel Sections */
.travel-section {
    padding: var(--spacing-16) 0;
}

.flights-section {
    background: var(--white);
}

.trains-section {
    background: var(--gray-50);
}

.buses-section {
    background: var(--white);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-12);
}

.section-header h2 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-3);
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: var(--spacing-3);
}

.section-header h2 i {
    width: 36px;
    height: 36px;
    color: var(--primary-blue);
}

.section-header p {
    font-size: var(--font-size-lg);
    color: var(--gray-600);
}

/* Travel Options */
.travel-options {
    display: grid;
    gap: var(--spacing-6);
}

.travel-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-normal);
}

.travel-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-blue);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-4);
    flex-wrap: wrap;
    gap: var(--spacing-4);
}

/* Flight Cards */
.airline-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.airline-logo {
    width: 48px;
    height: 48px;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.airline-info h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--spacing-1);
}

.route-info {
    font-size: var(--font-size-sm);
    color: var(--gray-500);
}

/* Train Cards */
.train-info,
.bus-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.train-icon,
.bus-icon {
    width: 48px;
    height: 48px;
    color: var(--primary-blue);
    background: var(--gray-100);
    padding: var(--spacing-2);
    border-radius: var(--radius-md);
}

.train-info h3,
.bus-info h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--spacing-1);
}

/* Price Display */
.price {
    text-align: right;
}

.price .amount {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-blue);
    display: block;
}

.price .note {
    font-size: var(--font-size-sm);
    color: var(--gray-500);
    background: var(--gray-100);
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--radius-sm);
    margin-top: var(--spacing-1);
    display: inline-block;
}

/* Time Information */
.time-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-4);
    flex-wrap: wrap;
    gap: var(--spacing-4);
}

.departure,
.arrival {
    text-align: center;
}

.departure .time,
.arrival .time {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--gray-800);
    display: block;
}

.departure .airport,
.departure .station,
.arrival .airport,
.arrival .station {
    font-size: var(--font-size-sm);
    color: var(--gray-500);
    margin-top: var(--spacing-1);
}

.duration {
    text-align: center;
    flex: 1;
}

.duration i {
    width: 20px;
    height: 20px;
    color: var(--gray-400);
    margin-bottom: var(--spacing-1);
}

.duration span:first-of-type {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--gray-700);
    display: block;
}

.duration .stops,
.duration .frequency,
.duration .type {
    font-size: var(--font-size-sm);
    color: var(--gray-500);
    margin-top: var(--spacing-1);
}

/* Class Options and Amenities */
.class-options,
.amenities {
    display: flex;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-4);
    flex-wrap: wrap;
}

.class-tag,
.amenity-tag {
    background: var(--gray-100);
    color: var(--gray-700);
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.amenity-tag {
    display: flex;
    align-items: center;
    gap: var(--spacing-1);
}

.amenity-tag i {
    width: 14px;
    height: 14px;
}

/* Card Actions */
.card-actions {
    display: flex;
    gap: var(--spacing-3);
    flex-wrap: wrap;
}

.book-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    background: var(--primary-blue);
    color: var(--white);
    text-decoration: none;
    padding: var(--spacing-3) var(--spacing-4);
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
    flex: 1;
    justify-content: center;
    min-width: 140px;
}

.book-btn:hover {
    background: var(--primary-blue-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.book-btn.secondary {
    background: var(--gray-100);
    color: var(--gray-700);
}

.book-btn.secondary:hover {
    background: var(--gray-200);
    color: var(--gray-800);
}

.book-btn i {
    width: 16px;
    height: 16px;
}

/* Travel Tips */
.travel-tips {
    padding: var(--spacing-16) 0;
    background: var(--gray-50);
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-6);
}

.tip-card {
    background: var(--white);
    padding: var(--spacing-6);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-normal);
}

.tip-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-blue);
}

.tip-card i {
    width: 48px;
    height: 48px;
    color: var(--secondary-orange);
    margin-bottom: var(--spacing-4);
}

.tip-card h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--spacing-3);
}

.tip-card p {
    color: var(--gray-600);
    line-height: 1.6;
}

/* Footer */
.footer {
    background: var(--gray-800);
    color: var(--white);
    padding: var(--spacing-16) 0 var(--spacing-8);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-8);
    margin-bottom: var(--spacing-8);
}

.footer-section h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
    color: var(--white);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-2);
}

.footer-section ul li a {
    color: var(--gray-300);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-section ul li a:hover {
    color: var(--white);
}

.footer-section p {
    color: var(--gray-300);
    margin-bottom: var(--spacing-2);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.footer-section p i {
    width: 16px;
    height: 16px;
}

.social-links {
    display: flex;
    gap: var(--spacing-3);
    margin-top: var(--spacing-4);
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--gray-700);
    color: var(--white);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.social-links a:hover {
    background: var(--primary-blue);
    transform: translateY(-2px);
}

.social-links a i {
    width: 20px;
    height: 20px;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-8);
    border-top: 1px solid var(--gray-700);
    color: var(--gray-400);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-3);
    }
    
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .nav {
        justify-content: center;
    }
    
    .hero {
        padding: var(--spacing-12) 0;
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .search-filters {
        flex-direction: column;
        align-items: center;
    }
    
    .filter-btn {
        width: 100%;
        max-width: 200px;
        justify-content: center;
    }
    
    .route-info {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: var(--spacing-4);
    }
    
    .route-card {
        padding: var(--spacing-4);
    }
    
    .travel-section {
        padding: var(--spacing-12) 0;
    }
    
    .section-header h2 {
        font-size: var(--font-size-2xl);
        flex-direction: column;
        gap: var(--spacing-2);
    }
    
    .card-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .price {
        text-align: left;
    }
    
    .time-info {
        flex-direction: column;
        gap: var(--spacing-3);
    }
    
    .departure,
    .arrival,
    .duration {
        text-align: center;
    }
    
    .card-actions {
        flex-direction: column;
    }
    
    .book-btn {
        width: 100%;
    }
    
    .tips-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-6);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: var(--font-size-2xl);
    }
    
    .route-info {
        grid-template-columns: 1fr;
    }
    
    .airline-info,
    .train-info,
    .bus-info {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-2);
    }
    
    .airline-logo,
    .train-icon,
    .bus-icon {
        align-self: center;
    }
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .quick-search,
    .card-actions {
        display: none;
    }
    
    .travel-card {
        break-inside: avoid;
        margin-bottom: var(--spacing-4);
    }
    
    body {
        background: white;
        color: black;
    }
    
    .travel-section {
        padding: var(--spacing-4) 0;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.6s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.slide-up {
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--gray-300);
    border-top-color: var(--primary-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Focus States for Accessibility */
.filter-btn:focus,
.book-btn:focus,
.nav-link:focus {
    outline: 2px solid var(--secondary-orange);
    outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --gray-100: #e0e0e0;
        --gray-200: #c0c0c0;
        --gray-300: #a0a0a0;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}