:root {
    --primary-color: #d4af37; /* Metallic Gold */
    --secondary-color: #1a1a1a; /* Dark Gray */
    --bg-color: #121212; /* Almost Black */
    --text-color: #e0e0e0;
    --card-bg: #1e1e1e;
    --accent-red: #cf6679;
}

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

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background-color: var(--secondary-color);
    padding: 20px 0;
    border-bottom: 2px solid var(--primary-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

header h1 {
    color: var(--primary-color);
    font-size: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s;
}

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

/* Hero Section */
#hero {
    background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('https://images.unsplash.com/photo-1550523116-2c938c03534b?ixlib=rb-1.2.1&auto=format&fit=crop&w=1350&q=80'); /* Generic dark background or placeholder */
    background-size: cover;
    background-position: center;
    height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    margin-bottom: 40px;
}

#hero h2 {
    font-size: 3rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

#hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--secondary-color);
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    text-transform: uppercase;
    transition: transform 0.2s, background-color 0.2s;
}

.btn:hover {
    transform: scale(1.05);
    background-color: #b5952f;
}

/* Sections */
section {
    padding: 40px 0;
}

h3 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 40px;
    color: var(--primary-color);
    position: relative;
}

h3::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background-color: var(--primary-color);
    margin: 10px auto 0;
}

/* Safety */
.warning-box {
    background-color: rgba(207, 102, 121, 0.1);
    border: 1px solid var(--accent-red);
    padding: 20px;
    border-radius: 5px;
    color: #ff8a80;
    text-align: center;
    font-weight: bold;
}

/* Materials Grid */
.materials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.material-card {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
}

.material-card h4 {
    color: var(--primary-color);
    margin-bottom: 20px;
    border-bottom: 1px solid #333;
    padding-bottom: 10px;
}

.material-card ul {
    list-style-position: inside;
}

.material-card li {
    margin-bottom: 10px;
}

/* Steps */
.step {
    display: flex;
    align-items: flex-start;
    margin-bottom: 40px;
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 8px;
    transition: transform 0.3s;
}

.step:hover {
    transform: translateY(-5px);
}

.step-number {
    font-size: 3rem;
    font-weight: bold;
    color: rgba(212, 175, 55, 0.2);
    margin-right: 30px;
    line-height: 1;
}

.step-content h4 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-bottom: 10px;
}

/* Footer */
footer {
    background-color: var(--secondary-color);
    text-align: center;
    padding: 30px 0;
    margin-top: 60px;
    border-top: 1px solid #333;
}

footer p {
    color: #777;
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    #hero h2 {
        font-size: 2rem;
    }
    
    header .container {
        flex-direction: column;
    }
    
    nav ul {
        margin-top: 20px;
        flex-wrap: wrap;
        justify-content: center;
    }
}