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

:root {
    --primary: #1a73e8;
    --primary-dark: #1557b0;
    --secondary: #34a853;
    --danger: #ea4335;
    --warning: #fbbc04;
    --dark: #202124;
    --light: #f8f9fa;
    --gray: #5f6368;
    --border-radius: 12px;
    --shadow: 0 4px 24px rgba(0,0,0,0.08);
    --shadow-hover: 0 8px 32px rgba(0,0,0,0.12);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--light);
    color: var(--dark);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.navbar {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: var(--transition);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 4px;
    align-items: center;
}

.nav-menu li a {
    text-decoration: none;
    color: var(--gray);
    padding: 8px 14px;
    border-radius: 8px;
    transition: var(--transition);
    font-size: 0.9rem;
    font-weight: 500;
}

.nav-menu li a:hover,
.nav-menu li a.active {
    background: var(--primary);
    color: #fff;
}

.lang-switch {
    border: 1px solid var(--primary);
    color: var(--primary) !important;
    border-radius: 20px !important;
}

.lang-switch:hover {
    background: var(--primary) !important;
    color: #fff !important;
}

.nav-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--dark);
}

.hero {
    background: linear-gradient(135deg, #1a73e8 0%, #0d47a1 100%);
    padding: 120px 20px 80px;
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="rgba(255,255,255,0.05)" d="M0,96L48,112C96,128,192,160,288,186.7C384,213,480,235,576,213.3C672,192,768,128,864,128C960,128,1056,192,1152,208C1248,224,1344,192,1392,176L1440,160L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"/></svg>') no-repeat bottom;
    background-size: cover;
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 32px;
    opacity: 0.9;
}

.search-form {
    display: flex;
    max-width: 600px;
    margin: 0 auto;
    gap: 0;
    border-radius: 50px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

.search-input {
    flex: 1;
    padding: 16px 24px;
    border: none;
    font-size: 1rem;
    outline: none;
}

.search-btn {
    padding: 16px 32px;
    background: var(--secondary);
    color: #fff;
    border: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.search-btn:hover {
    background: #2d8f47;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
    flex: 1;
}

.section {
    margin-bottom: 60px;
}

.section-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--dark);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--primary);
    border-radius: 2px;
    margin-top: 8px;
}

.filter-bar {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.filter-bar select {
    padding: 10px 16px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    background: #fff;
    cursor: pointer;
    transition: var(--transition);
    min-width: 150px;
}

.filter-bar select:hover {
    border-color: var(--primary);
}

.flight-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 20px;
}

.flight-card {
    background: #fff;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 20px;
    transition: var(--transition);
    cursor: pointer;
}

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

.flight-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.flight-number {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary);
}

.flight-status {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.status-on-time {
    background: #e6f4ea;
    color: var(--secondary);
}

.status-delayed {
    background: #fef7e0;
    color: #e37400;
}

.status-cancelled {
    background: #fce8e6;
    color: var(--danger);
}

.flight-body .route {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.airport-group {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.airport-code {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--dark);
}

.airport-name {
    font-size: 0.85rem;
    color: var(--gray);
}

.time {
    font-size: 0.8rem;
    color: var(--gray);
    margin-top: 4px;
}

.flight-line {
    color: var(--primary);
    font-size: 1.2rem;
}

.flight-details {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    font-size: 0.85rem;
    color: var(--gray);
    border-top: 1px solid #eee;
    padding-top: 12px;
}

.delay-badge {
    color: #e37400;
    font-weight: 600;
}

.no-results {
    text-align: center;
    padding: 40px;
    color: var(--gray);
    font-size: 1.1rem;
}

.airport-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.airport-card {
    background: #fff;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
}

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

.airport-header {
    background: linear-gradient(135deg, var(--primary), #0d47a1);
    padding: 20px;
    text-align: center;
}

.airport-code-lg {
    font-size: 2.5rem;
    font-weight: 800;
    color: #fff;
}

.airport-body {
    padding: 20px;
}

.airport-body h3 {
    font-size: 1.1rem;
    margin-bottom: 12px;
}

.airport-body p {
    font-size: 0.9rem;
    color: var(--gray);
    margin-bottom: 8px;
}

.airport-status-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.stat-card {
    background: #fff;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 30px 20px;
    text-align: center;
    transition: var(--transition);
}

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

.stat-icon {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 12px;
}

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--dark);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--gray);
    margin-top: 4px;
}

.footer {
    background: var(--dark);
    color: #fff;
    text-align: center;
    padding: 30px 20px;
    margin-top: auto;
}

.footer a {
    color: var(--primary-light, #8ab4f8);
}

.login-form {
    max-width: 400px;
    margin: 0 auto;
    background: #fff;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.login-form h2 {
    text-align: center;
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(26,115,232,0.1);
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-family: monospace;
    font-size: 0.9rem;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}

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

.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 0.9rem;
}

.alert-error {
    background: #fce8e6;
    color: var(--danger);
}

.alert-success {
    background: #e6f4ea;
    color: var(--secondary);
}

.admin-panel {
    background: #fff;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.admin-panel h2 {
    margin-bottom: 24px;
}

.admin-panel hr {
    margin: 24px 0;
    border: none;
    border-top: 1px solid #eee;
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        background: rgba(255,255,255,0.98);
        box-shadow: 0 4px 20px rgba(0,0,0,0.1);
        padding: 20px;
    }

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

    .nav-toggle {
        display: block;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .search-form {
        flex-direction: column;
        border-radius: var(--border-radius);
    }

    .search-input {
        border-radius: var(--border-radius) var(--border-radius) 0 0;
    }

    .search-btn {
        border-radius: 0 0 var(--border-radius) var(--border-radius);
    }

    .flight-grid {
        grid-template-columns: 1fr;
    }

    .airport-grid {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }

    .filter-bar {
        flex-direction: column;
    }

    .filter-bar select {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.5rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .flight-details {
        flex-direction: column;
        gap: 8px;
    }
}