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

:root {
    /* Color Palette */
    --primary-color: #1a365d;
    --primary-light: #2d4a8a;
    --secondary-color: #d4af37;
    --accent-color: #00a8e8;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --gray-color: #6c757d;
    --light-gray: #e9ecef;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Montserrat', 'Inter', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    color: var(--dark-color);
    line-height: 1.6;
    background-color: #fff;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 3rem;
}

h2 {
    font-size: 2.25rem;
}

h3 {
    font-size: 1.75rem;
}

h4 {
    font-size: 1.5rem;
}

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-light);
}

.highlight {
    color: var(--secondary-color);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 1rem;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all var(--transition-normal);
    gap: 0.5rem;
}

.btn i {
    font-size: 1.1em;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--primary-light);
    border-color: var(--primary-light);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

/* Navigation */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: white;
    box-shadow: var(--shadow-sm);
    padding: 1rem 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark-color);
}

.logo i {
    color: var(--primary-color);
    font-size: 1.8rem;
}

.logo-highlight {
    color: var(--secondary-color);
}

.nav-menu {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-link {
    color: var(--gray-color);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
}

.nav-auth {
    display: flex;
    gap: var(--spacing-sm);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--primary-color);
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background-color: white;
    box-shadow: var(--shadow-md);
    padding: var(--spacing-md);
    flex-direction: column;
    gap: var(--spacing-md);
    z-index: 999;
}

.mobile-menu.active {
    display: flex;
}

.mobile-nav-link {
    padding: 0.75rem;
    border-bottom: 1px solid var(--light-gray);
    color: var(--dark-color);
    font-weight: 500;
}

.mobile-nav-link.active {
    color: var(--primary-color);
}

.mobile-auth {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) 0;
}

/* Hero Section */
.hero {
    padding: var(--spacing-xxl) 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    overflow: hidden;
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xl);
}

.hero-content {
    flex: 1;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--gray-color);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--gray-color);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-bg-image {
    width: 100%;
    max-width: 600px;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    object-fit: cover;
}

/* Search Section */
.search-section {
    padding: var(--spacing-xl) 0;
    background-color: white;
    margin-top: -50px;
    position: relative;
    z-index: 10;
}

.search-card {
    background-color: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.search-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--primary-color);
}

.search-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.search-row {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.search-group {
    flex: 1;
    min-width: 200px;
}

.search-group.full-width {
    flex: 100%;
}

.search-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--primary-color);
}

.search-group input,
.search-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--light-gray);
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.search-group input:focus,
.search-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.budget-slider {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.budget-slider input[type="range"] {
    width: 100%;
    height: 8px;
    background: var(--light-gray);
    border-radius: 4px;
    outline: none;
    -webkit-appearance: none;
}

.budget-slider input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 24px;
    height: 24px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
}

.budget-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--gray-color);
}

.search-btn {
    align-self: center;
    margin-top: var(--spacing-md);
}

/* Featured Section */
.featured-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--light-color);
}

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

.section-header h2 {
    color: var(--primary-color);
}

.section-header p {
    color: var(--gray-color);
    max-width: 600px;
    margin: 0 auto var(--spacing-md);
}

.view-all {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    font-weight: 500;
}

.view-all:hover {
    color: var(--primary-light);
}

.flights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.flight-card {
    background-color: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.flight-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.flight-header {
    padding: var(--spacing-md);
    background-color: var(--primary-color);
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.flight-aircraft {
    font-weight: 600;
    font-size: 1.1rem;
}

.flight-price {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary-color);
}

.flight-body {
    padding: var(--spacing-md);
}

.flight-route {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--light-gray);
}

.route-origin,
.route-destination {
    text-align: center;
}

.route-orientation {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--gray-color);
}

.route-orientation i {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.airport-code {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: block;
}

.airport-name {
    font-size: 0.9rem;
    color: var(--gray-color);
}

.flight-details {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.detail-item {
    text-align: center;
}

.detail-label {
    display: block;
    font-size: 0.8rem;
    color: var(--gray-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.25rem;
}

.detail-value {
    font-weight: 600;
    color: var(--dark-color);
}

.flight-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.flight-actions .btn {
    flex: 1;
    padding: 0.5rem;
    font-size: 0.9rem;
}

.loading-spinner {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    color: var(--gray-color);
}

.loading-spinner i {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

/* How It Works */
.how-it-works {
    padding: var(--spacing-xxl) 0;
    background-color: white;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.step-card {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--light-color);
    border-radius: var(--radius-lg);
    transition: transform var(--transition-normal);
}

.step-card:hover {
    transform: translateY(-4px);
}

.step-icon {
    position: relative;
    width: 80px;
    height: 80px;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    color: white;
    font-size: 2rem;
}

.step-number {
    position: absolute;
    top: -10px;
    right: -10px;
    width: 30px;
    height: 30px;
    background-color: var(--secondary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 700;
    color: white;
}

.step-card h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.disclaimer {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-md);
    background-color: #fff3cd;
    border-radius: var(--radius-md);
    border-left: 4px solid var(--warning-color);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.disclaimer i {
    color: var(--warning-color);
    font-size: 1.5rem;
    flex-shrink: 0;
}

.disclaimer p {
    margin-bottom: 0;
    color: #856404;
}

/* Testimonials */
.testimonials {
    padding: var(--spacing-xxl) 0;
    background-color: var(--light-color);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.testimonial-card {
    background-color: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.testimonial-rating {
    color: var(--secondary-color);
    margin-bottom: var(--spacing-md);
}

.testimonial-text {
    font-style: italic;
    margin-bottom: var(--spacing-lg);
    color: var(--dark-color);
}

.testimonial-author {
    display: flex;
    flex-direction: column;
}

.testimonial-author strong {
    color: var(--primary-color);
}

.testimonial-author span {
    color: var(--gray-color);
    font-size: 0.9rem;
}

/* FAQ */
.faq {
    padding: var(--spacing-xxl) 0;
    background-color: white;
}

.faq-grid {
    max-width: 800px;
    margin: var(--spacing-xl) auto 0;
}

.faq-item {
    border-bottom: 1px solid var(--light-gray);
    padding: var(--spacing-md) 0;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    padding: var(--spacing-sm) 0;
}

.faq-question h3 {
    margin-bottom: 0;
    font-size: 1.25rem;
    color: var(--primary-color);
}

.faq-question i {
    color: var(--gray-color);
    transition: transform var(--transition-normal);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
}

.faq-answer.active {
    max-height: 500px;
}

.faq-answer p {
    padding: var(--spacing-md) 0;
    color: var(--gray-color);
}

/* CTA Section */
.cta-section {
    padding: var(--spacing-xxl) 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
}

.cta-card {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.cta-card h2 {
    color: white;
    margin-bottom: var(--spacing-md);
}

.cta-card p {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.cta-section .btn-outline {
    background-color: transparent;
    color: white;
    border-color: white;
}

.cta-section .btn-outline:hover {
    background-color: white;
    color: var(--primary-color);
}

/* Footer */
.footer {
    background-color: var(--dark-color);
    color: white;
    padding: var(--spacing-xxl) 0 var(--spacing-xl);
}

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

.footer-col h3 {
    color: white;
    margin-bottom: var(--spacing-md);
    font-size: 1.25rem;
}

.footer-description {
    color: #adb5bd;
    margin: var(--spacing-md) 0;
}

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

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: white;
    transition: background-color var(--transition-fast);
}

.social-links a:hover {
    background-color: var(--primary-color);
    color: white;
}

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

.footer-col ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-col ul li a {
    color: #adb5bd;
    transition: color var(--transition-fast);
}

.footer-col ul li a:hover {
    color: white;
}

.contact-info li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    color: #adb5bd;
}

.contact-info i {
    width: 20px;
    color: var(--secondary-color);
}

.footer-bottom {
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-bottom p {
    margin-bottom: 0;
    color: #adb5bd;
}

.design-credit a {
    color: var(--secondary-color);
}

.design-credit a:hover {
    color: white;
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 1024px) {
    h1 {
        font-size: 2.5rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-cta {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .nav-menu,
    .nav-auth {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .search-row {
        flex-direction: column;
    }
    
    .search-group {
        min-width: 100%;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    h1 {
        font-size: 1.75rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .image-placeholder i {
        font-size: 5rem;
    }
    
    .image-placeholder p {
        font-size: 1.2rem;
    }
    
    .search-card {
        padding: var(--spacing-md);
    }
}