:root {
            --primary-dark: #1a1a1a;
            --secondary-gray: #4a4a4a;
            --accent-gold: #b8860b;
            --text-dark: #2c2c2c;
        }
        
        body {
            font-family: 'Noto Sans SC', sans-serif;
            color: var(--text-dark);
        }
        
        .font-serif {
            font-family: 'Noto Serif SC', serif;
        }
        
        .gradient-text {
            background: linear-gradient(45deg, var(--accent-gold), #ffd700);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        
        .metal-button {
            background: linear-gradient(145deg, #2a2a2a, #1a1a1a);
            border: 1px solid var(--accent-gold);
            box-shadow: 0 4px 15px rgba(184, 134, 11, 0.3);
            transition: all 0.3s ease;
        }
        
        .metal-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(184, 134, 11, 0.4);
            background: linear-gradient(145deg, #3a3a3a, #2a2a2a);
        }
        
        .card-hover {
            transition: all 0.3s ease;
            border: 1px solid rgba(184, 134, 11, 0.2);
        }
        
        .card-hover:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 35px rgba(0,0,0,0.1);
            border-color: var(--accent-gold);
        }
        
        .precision-line {
            height: 2px;
            background: linear-gradient(90deg, transparent, var(--accent-gold), transparent);
        }
        
        .nav-link {
            position: relative;
            transition: color 0.3s ease;
        }
        
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: -5px;
            left: 50%;
            background: var(--accent-gold);
            transition: all 0.3s ease;
            transform: translateX(-50%);
        }
        
        .nav-link:hover::after {
            width: 100%;
        }
        
        .scroll-reveal {
            opacity: 0;
            transform: translateY(30px);
            transition: all 0.6s ease;
        }
        
        .scroll-reveal.revealed {
            opacity: 1;
            transform: translateY(0);
        }
        
        /* Material Selector Styles */
        .material-selector {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
            margin-bottom: 2rem;
        }
        
        .material-card {
            background: white;
            border: 2px solid #e5e7eb;
            border-radius: 12px;
            padding: 1.5rem;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
        }
        
        .material-card.active {
            border-color: var(--accent-gold);
            background: linear-gradient(145deg, #fff9e6, #fffbf0);
            box-shadow: 0 8px 25px rgba(184, 134, 11, 0.2);
        }
        
        .material-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(0,0,0,0.1);
        }
        
        .material-icon {
            width: 60px;
            height: 60px;
            margin: 0 auto 1rem;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: white;
            font-weight: bold;
        }
        
        .stainless-steel { background: linear-gradient(145deg, #6b7280, #9ca3af); }
        .aluminum { background: linear-gradient(145deg, #d1d5db, #f3f4f6); color: #374151; }
        .carbon-steel { background: linear-gradient(145deg, #374151, #6b7280); }
        .copper { background: linear-gradient(145deg, #d97706, #f59e0b); }
        
        /* Process Selector Styles */
        .process-selector {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1rem;
            margin-bottom: 2rem;
        }
        
        .process-card {
            background: white;
            border: 2px solid #e5e7eb;
            border-radius: 12px;
            padding: 1.5rem;
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
        }
        
        .process-card.active {
            border-color: var(--accent-gold);
            background: linear-gradient(145deg, #fff9e6, #fffbf0);
            box-shadow: 0 8px 25px rgba(184, 134, 11, 0.2);
        }
        
        .process-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(0,0,0,0.1);
        }
        
        .process-details {
            display: none;
            margin-top: 1rem;
            padding-top: 1rem;
            border-top: 1px solid #e5e7eb;
        }
        
        .process-card.active .process-details {
            display: block;
        }
        
        /* Capability Chart Styles */
        .capability-chart {
            background: white;
            border-radius: 12px;
            padding: 2rem;
            box-shadow: 0 4px 20px rgba(0,0,0,0.1);
            margin-top: 2rem;
        }
        
        .capability-bar {
            display: flex;
            align-items: center;
            margin-bottom: 1rem;
        }
        
        .capability-label {
            width: 120px;
            font-weight: 500;
            color: #374151;
        }
        
        .capability-progress {
            flex: 1;
            height: 20px;
            background: #e5e7eb;
            border-radius: 10px;
            overflow: hidden;
            margin: 0 1rem;
        }
        
        .capability-fill {
            height: 100%;
            background: linear-gradient(90deg, var(--accent-gold), #ffd700);
            border-radius: 10px;
            transition: width 1s ease;
        }
        
        .capability-value {
            width: 60px;
            text-align: right;
            font-weight: 600;
            color: var(--accent-gold);
        }