:root {
            --primary: #0a192f;
            --accent: #fdbb2d;
            --bg: #f8f9fa;
        }

        body { font-family: 'Segoe UI', Roboto, sans-serif; margin: 0; background-color: var(--bg); color: #333; }
        
        nav { background: var(--primary); color: white; padding: 15px; text-align: center; box-shadow: 0 2px 10px rgba(0,0,0,0.3); }
        .logo { font-size: 1.6rem; font-weight: 800; letter-spacing: 1px; }
        .logo span { color: var(--accent); }

        header { 
            background: linear-gradient(rgba(10, 25, 47, 0.85), rgba(10, 25, 47, 0.85)), url('https://images.unsplash.com/photo-1486006920555-c77dcf18193c?q=80&w=2000&auto=format&fit=crop');
            background-size: cover; background-position: center;
            color: white; padding: 60px 20px; text-align: center;
        }

        .main-container { max-width: 850px; margin: -40px auto 60px; background: white; padding: 40px; border-radius: 15px; box-shadow: 0 15px 35px rgba(0,0,0,0.1); border-top: 6px solid var(--accent); }
        
        h2 { color: var(--primary); margin-top: 0; }
        .section-label { background: #eee; padding: 5px 12px; border-radius: 4px; font-size: 0.8rem; font-weight: bold; margin-bottom: 15px; display: inline-block; color: #666; }

        .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
        .full { grid-column: span 2; }
        
        label { display: block; margin-bottom: 6px; font-weight: 600; color: var(--primary); font-size: 0.95rem; }
        input, select, textarea { 
            width: 100%; padding: 14px; border: 1px solid #ddd; border-radius: 8px; box-sizing: border-box; font-size: 1rem; transition: 0.3s; font-family: inherit;
        }
        input:focus, select:focus, textarea:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 8px rgba(253, 187, 45, 0.2); }

        .service-select { background-color: #fff9e6; border: 1px solid var(--accent); font-weight: bold; cursor: pointer; }

        .optional-badge { font-weight: normal; font-size: 0.8rem; color: #888; font-style: italic; }

        button { 
            width: 100%; padding: 18px; background: var(--primary); color: white; border: none; border-radius: 8px; font-size: 1.3rem; font-weight: bold; cursor: pointer; margin-top: 25px; transition: 0.3s;
        }
        button:hover { background: #142a4d; transform: translateY(-2px); box-shadow: 0 5px 15px rgba(0,0,0,0.2); }

        .footer-info { text-align: center; font-size: 0.9rem; color: #777; margin-top: 30px; line-height: 1.6; }

        /* WhatsApp contact bar */
        .whatsapp-bar {
            background: #25d366;
            border-radius: 10px;
            padding: 18px 24px;
            margin-bottom: 30px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-wrap: wrap;
            gap: 16px;
        }
        .whatsapp-bar .wa-label {
            color: white;
            font-weight: 700;
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .whatsapp-bar .wa-label svg { flex-shrink: 0; }
        .wa-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: white;
            color: #128c5e;
            font-weight: 700;
            font-size: 0.95rem;
            padding: 10px 18px;
            border-radius: 50px;
            text-decoration: none;
            transition: 0.2s;
            white-space: nowrap;
        }
        .wa-link:hover { background: #e6fff0; transform: scale(1.04); }

        /* Chassis info hint */
        .field-hint { font-size: 0.78rem; color: #999; margin-top: 4px; font-style: italic; }
        
        @media (max-width: 650px) { .form-grid { grid-template-columns: 1fr; } .full { grid-column: span 1; } }