:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #f59e0b;
    --dark: #0f172a;
    --light: #f8fafc;
    --glass: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--light);
    color: var(--dark);
    line-height: 1.6;
}

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

@keyframes slideIn {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

.animate-fade { animation: fadeIn 0.8s ease-out forwards; }

/* Navigation */
nav {
    background: white;
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    transition: var(--transition);
}

.nav-links a:hover { color: var(--primary); }

.btn-primary {
    background: var(--primary);
    color: white !important;
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(37, 99, 235, 0.3);
}

/* Hero Section */
.hero {
    height: 85vh;
    background: linear-gradient(rgba(15, 23, 42, 0.7), rgba(15, 23, 42, 0.7)), 
                url('https://images.unsplash.com/photo-1449965408869-eaa3f722e40d?auto=format&fit=crop&q=80&w=1920');
    background-size: cover;
    background-position: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: white;
    padding: 0 1rem;
}

.hero h1 {
    font-size: 4rem;
    margin-bottom: 1rem;
    font-weight: 900;
}

.search-container {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(20px);
    padding: 2rem;
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    margin-top: 2rem;
    width: 90%;
    max-width: 1000px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.3);
}

.search-form {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    text-align: left;
}

.input-group label {
    font-size: 0.8rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
    text-transform: uppercase;
}

.input-group input, .input-group select {
    padding: 0.8rem;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.3);
    background: rgba(255,255,255,0.1);
    color: white;
    font-size: 1rem;
}

.input-group input::placeholder { color: rgba(255,255,255,0.5); }

/* Car Cards */
.cars-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
    padding: 4rem 5%;
}

.car-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    border: 1px solid #eee;
}

.car-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

.car-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
}

.car-details { padding: 1.5rem; }

.car-price {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
}

.car-features {
    display: flex;
    gap: 1rem;
    margin: 1rem 0;
    color: #64748b;
    font-size: 0.9rem;
}

/* Auth Pages */
.auth-container {
    max-width: 450px;
    margin: 5rem auto;
    padding: 2.5rem;
    background: white;
    border-radius: 20px;
    box-shadow: var(--shadow);
}

.auth-form input {
    width: 100%;
    padding: 0.8rem;
    margin-bottom: 1rem;
    border-radius: 8px;
    border: 1px solid #ddd;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .nav-links { display: none; }
    .search-form { grid-template-columns: 1fr; }
}