:root {
    /* Colors */
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --bg-body: #f8fafc;
    --bg-card: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --success: #22c55e;
    --danger: #ef4444;

    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;

    /* Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-body: #0f172a;
        --bg-card: #1e293b;
        --text-main: #f1f5f9;
        --text-muted: #94a3b8;
        --border-color: #334155;
        --glass-bg: rgba(30, 41, 59, 0.7);
        --glass-border: rgba(255, 255, 255, 0.1);
    }
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.5;
    padding-bottom: 80px;
    /* Space for bottom nav */
}

.app-header {
    padding: var(--spacing-lg) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 10;
    border-bottom: 1px solid var(--glass-border);
}

h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

main {
    padding: var(--spacing-md);
    max-width: 600px;
    margin: 0 auto;
}

.car-list {
    display: grid;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 64px;
    background: var(--bg-card);
    display: flex;
    justify-content: space-around;
    align-items: center;
    border-top: 1px solid var(--border-color);
    z-index: 50;
    padding-bottom: env(safe-area-inset-bottom);
}

.nav-item {
    background: none;
    border: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    color: var(--text-muted);
    font-size: 0.75rem;
    cursor: pointer;
    padding: 8px;
    width: 100%;
}

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

.nav-item .icon {
    font-size: 1.25rem;
}

/* Utilities */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color);
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: flex-end;
    /* Bottom sheet on mobile */
    z-index: 100;
    animation: fadeIn 0.2s ease-out;
}

.modal-content {
    background: var(--bg-card);
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    padding: var(--spacing-lg);
    animation: slideUp 0.3s ease-out;
    max-height: 90vh;
    overflow-y: auto;
}

@media (min-width: 600px) {
    .modal-overlay {
        align-items: center;
        padding: var(--spacing-md);
    }

    .modal-content {
        border-radius: var(--radius-md);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    padding: var(--spacing-xs);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.form-group input {
    width: 100%;
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: var(--bg-body);
    color: var(--text-main);
    font-size: 1rem;
    font-family: inherit;
}

.user-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-body);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    border: 1px solid var(--border-color);
}

.form-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.form-actions button {
    flex: 1;
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    border: none;
}

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

.btn-secondary {
    background: transparent;
    border: 1px solid var(--border-color) !important;
    color: var(--text-main);
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
    }

    to {
        transform: translateY(0);
    }
}