:root {
    --primary: #f59e0b; /* Yellow-amber for construction focus */
    --primary-hover: #d97706;
    --bg-base: #0f172a; /* Deep modern dark slate */
    --bg-surface: rgba(30, 41, 59, 0.7);
    --bg-card: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border: rgba(255, 255, 255, 0.1);
    --glow: rgba(245, 158, 11, 0.2);
    
    --radius-md: 12px;
    --radius-lg: 24px;
    --shadow-card: 0 10px 30px -5px rgba(0, 0, 0, 0.5);
    --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(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Glassmorphism Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 1.5rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-surface);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
}

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

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background-color: var(--primary);
    transition: var(--transition);
}

.nav-links a:hover::after {
    width: 100%;
}

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

.btn-primary {
    background: var(--primary);
    color: #000;
    padding: 0.75rem 1.75rem;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 14px var(--glow);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(245, 158, 11, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    padding: 0.75rem 1.75rem;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(245, 158, 11, 0.05);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 0 5%;
    position: relative;
}

.hero-bg {
    position: absolute;
    top: 0;
    right: 0;
    width: 55%;
    height: 100%;
    z-index: -1;
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    mask-image: linear-gradient(to left, rgba(0,0,0,1) 50%, rgba(0,0,0,0));
    -webkit-mask-image: linear-gradient(to left, rgba(0,0,0,1) 50%, rgba(0,0,0,0));
}

.hero-content {
    max-width: 600px;
    margin-top: 80px;
    animation: fadeUp 1s ease-out forwards;
}

.badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(245, 158, 11, 0.1);
    color: var(--primary);
    border: 1px solid var(--primary);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.hero-title {
    font-size: 4.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, #fff, var(--text-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-title span {
    color: var(--primary);
    -webkit-text-fill-color: var(--primary);
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 500px;
}

.hero-actions {
    display: flex;
    gap: 1rem;
}

/* Catalog Display (Cards) */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
}

.section-title::after {
    content: '';
    position: absolute;
    width: 60%;
    height: 3px;
    background: var(--primary);
    bottom: -10px;
    left: 20%;
    border-radius: 3px;
}

.catalog-section {
    padding: 6rem 5%;
    background: var(--bg-card); /* Slightly different dark */
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
}

.card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    transition: var(--transition);
    box-shadow: var(--shadow-card);
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-10px);
    border-color: var(--primary);
    box-shadow: 0 20px 40px rgba(0,0,0,0.6), 0 0 20px var(--glow);
}

.card-img {
    width: 100%;
    height: 220px;
    border-radius: 8px;
    object-fit: cover;
    margin-bottom: 1.5rem;
    background: #2a364b;
    transition: var(--transition);
}

.card:hover .card-img {
    transform: scale(1.03);
}

.card h3 {
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
}

.card p.desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.card .price {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 1.5rem;
    display: block;
}

.card .price span {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 400;
    display: block;
}

/* Auth Pages */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: radial-gradient(circle at top right, var(--glow), transparent), var(--bg-base);
}

.auth-card {
    background: var(--bg-surface);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    padding: 3rem;
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 450px;
    box-shadow: var(--shadow-card);
    animation: fadeUp 0.6s ease-out forwards;
}

.auth-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.auth-title {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    color: #fff;
}

.auth-subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.form-control {
    width: 100%;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0.8rem 1rem;
    color: #fff;
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--glow);
    background: rgba(15, 23, 42, 0.8);
}

.auth-footer {
    margin-top: 2rem;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.auth-footer a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

.alert {
    padding: 1rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #fca5a5;
}

.alert-success {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.2);
    color: #86efac;
}

/* Animations */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Footer */
footer {
    background: #0b1121;
    padding: 4rem 5%;
    text-align: center;
    border-top: 1px solid var(--border);
}

footer p {
    color: var(--text-secondary);
}