* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Inter', sans-serif;
        }

        :root {
            --white: #ffffff;
            --light-gray: #f8fafc;
            --gray: #e2e8f0;
            --dark-gray: #334155;
            --navy: #0a2a44;
            --gold: #c9a227;
            --gold-light: #dbb957;
            --shadow: 0 10px 25px -5px rgba(0,0,0,0.05), 0 8px 10px -6px rgba(0,0,0,0.02);
        }

        body {
            background-color: var(--white);
            color: #1e293b;
            line-height: 1.5;
        }

        /* utility */
        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 2rem;
        }

        /* sticky header */
        .header {
            position: sticky;
            top: 0;
            background: rgba(255,255,255,0.9);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: 0 4px 6px -2px rgba(0,0,0,0.05);
            z-index: 50;
            padding: 0.8rem 0;
        }

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

        .logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--navy);
            letter-spacing: -0.02em;
        }
        .logo span {
            color: var(--gold);
        }

        .nav-menu {
            display: flex;
            gap: 2rem;
            align-items: center;
            flex-wrap: wrap;
        }
        .nav-menu a {
            text-decoration: none;
            font-weight: 500;
            color: var(--dark-gray);
            transition: color 0.2s;
            font-size: 0.95rem;
        }
        .nav-menu a:hover {
            color: var(--gold);
        }
        .cta-btn {
            background: var(--navy);
            color: white !important;
            padding: 0.5rem 1.2rem;
            border-radius: 30px;
            font-weight: 600;
            border: 1px solid var(--navy);
            transition: all 0.2s;
        }
        .cta-btn:hover {
            background: var(--gold);
            border-color: var(--gold);
            color: var(--navy) !important;
        }

        /* hero */
        .hero {
            background: linear-gradient(120deg, rgba(10,42,68,0.85), rgba(10,42,68,0.7)), url('../img/hero.avif') center/cover no-repeat;
            color: white;
            padding: 6rem 0;
        }
        .hero-content {
            max-width: 700px;
        }
        .hero h1 {
            font-size: 3.3rem;
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 1rem;
        }
        .hero p {
            font-size: 1.25rem;
            opacity: 0.9;
            margin-bottom: 2rem;
        }
        .btn-group {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
        }
        .btn {
            padding: 0.8rem 2rem;
            border-radius: 40px;
            font-weight: 600;
            text-decoration: none;
            transition: 0.2s;
            display: inline-block;
        }
        .btn-primary {
            background: var(--gold);
            color: var(--navy);
            border: 2px solid var(--gold);
        }
        .btn-primary:hover {
            background: transparent;
            color: white;
        }
        .btn-outline {
            border: 2px solid white;
            color: white;
        }
        .btn-outline:hover {
            background: white;
            color: var(--navy);
        }

        /* section titles */
        .section-title {
            font-size: 2.5rem;
            font-weight: 600;
            color: var(--navy);
            margin-bottom: 1rem;
        }
        .section-sub {
            color: var(--dark-gray);
            max-width: 700px;
            margin-bottom: 3rem;
        }

        /* about */
        .about-grid {
            display: flex;
            gap: 4rem;
            align-items: center;
            flex-wrap: wrap;
        }
        .about-stats {
            display: flex;
            gap: 2rem;
            margin-top: 2rem;
        }
        .stat-item {
            display: flex;
            align-items: center;
            gap: 0.8rem;
        }
        .stat-item i {
            color: var(--gold);
            font-size: 2rem;
        }

        /* services grid */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 2rem;
            margin-top: 2rem;
        }
        .service-card {
            background: var(--white);
            border-radius: 1rem;
            padding: 2rem 1.5rem;
            box-shadow: var(--shadow);
            border: 1px solid var(--gray);
            transition: transform 0.2s;
        }
        .service-card:hover {
            transform: translateY(-6px);
            border-color: var(--gold-light);
        }
        .service-icon {
            font-size: 2.5rem;
            color: var(--gold);
            margin-bottom: 1rem;
        }
        .service-card h3 {
            font-size: 1.3rem;
            margin-bottom: 0.5rem;
        }
        .service-card p {
            color: #475569;
            font-size: 0.9rem;
            margin-bottom: 1.2rem;
        }
        .learn-more {
            color: var(--navy);
            font-weight: 600;
            text-decoration: none;
            border-bottom: 2px solid var(--gold);
            padding-bottom: 2px;
        }

        /* why choose us */
        .benefits-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }
        .benefit {
            text-align: center;
        }
        .benefit i {
            font-size: 2.5rem;
            color: var(--gold);
            background: #fef9e7;
            padding: 1rem;
            border-radius: 60%;
            margin-bottom: 1rem;
        }
        .benefit h4 {
            font-weight: 600;
        }

        /* warranty */
        .warranty-box {
            background: var(--navy);
            color: white;
            padding: 3rem;
            border-radius: 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 2rem;
        }
        .warranty-box .btn-primary {
            background: var(--gold);
            border: none;
            color: var(--navy);
        }

        /* form */
        .form-container {
            background: var(--light-gray);
            border-radius: 2rem;
            padding: 3rem;
            box-shadow: var(--shadow);
        }
        .quote-form {
            display: grid;
            grid-template-columns: repeat(2,1fr);
            gap: 1.5rem;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 0.3rem;
        }
        .form-group.full {
            grid-column: span 2;
        }
        .form-group label {
            font-weight: 500;
            color: var(--navy);
        }
        .form-group input, .form-group select, .form-group textarea {
            padding: 0.8rem 1rem;
            border: 1px solid var(--gray);
            border-radius: 12px;
            font-size: 1rem;
            background: white;
        }
        .terms-check {
            grid-column: span 2;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            margin: 0.5rem 0;
        }
        .submit-btn {
            background: var(--navy);
            color: white;
            border: none;
            padding: 1rem 2rem;
            border-radius: 40px;
            font-weight: 700;
            font-size: 1.1rem;
            cursor: pointer;
            width: fit-content;
        }
        .submit-btn:hover {
            background: var(--gold);
            color: var(--navy);
        }
        .confirmation-message {
            background: #d4edda;
            color: #155724;
            padding: 1rem;
            border-radius: 12px;
            margin-top: 1.5rem;
            display: none;
        }

        /* testimonials carousel */
        .carousel-container {
            position: relative;
            max-width: 800px;
            margin: 2rem auto;
            overflow: hidden;
        }
        .carousel-track {
            display: flex;
            transition: transform 0.4s ease;
        }
        .testimonial-card {
            min-width: 100%;
            background: var(--white);
            padding: 2.5rem;
            border-radius: 2rem;
            box-shadow: var(--shadow);
            border: 1px solid var(--gray);
        }
        .stars {
            color: var(--gold);
            margin-bottom: 1rem;
        }
        .customer-name {
            font-weight: 700;
            margin-top: 1rem;
            color: var(--navy);
        }
        .carousel-btn {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            background: white;
            border: none;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
            cursor: pointer;
            font-size: 1.2rem;
            color: var(--navy);
            z-index: 2;
        }
        .prev { left: 10px; }
        .next { right: 10px; }
        .carousel-dots {
            display: flex;
            justify-content: center;
            gap: 0.5rem;
            margin-top: 1rem;
        }
        .dot {
            width: 10px;
            height: 10px;
            background: var(--gray);
            border-radius: 50%;
            cursor: pointer;
        }
        .dot.active {
            background: var(--gold);
        }

        /* contact & map */
        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
        }
        .map-placeholder {
            background: #e2e8f0;
            height: 250px;
            border-radius: 1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #475569;
        }

        /* footer */
        .footer {
            background: var(--navy);
            color: white;
            padding: 3rem 0 1rem;
            margin-top: 4rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px,1fr));
            gap: 2.5rem;
        }
        .footer a {
            color: #cbd5e1;
            text-decoration: none;
            display: block;
            margin: 0.5rem 0;
        }
        .footer a:hover { color: var(--gold); }
        .newsletter-input {
            display: flex;
            margin-top: 1rem;
        }
        .newsletter-input input {
            flex: 1;
            padding: 0.7rem;
            border: none;
            border-radius: 30px 0 0 30px;
        }
        .newsletter-input button {
            background: var(--gold);
            border: none;
            padding: 0 1.2rem;
            border-radius: 0 30px 30px 0;
            font-weight: 700;
            cursor: pointer;
        }
        .copyright {
            text-align: center;
            border-top: 1px solid #256;
            margin-top: 2rem;
            padding-top: 2rem;
            color: #94a3b8;
        }

        /* modal popups */
        .modal {
            display: none;
            position: fixed;
            top: 0; left: 0; width: 100%; height: 100%;
            background: rgba(0,0,0,0.5);
            align-items: center;
            justify-content: center;
            z-index: 999;
        }
        .modal.active {
            display: flex;
        }
        .modal-content {
            background: white;
            max-width: 500px;
            width: 90%;
            max-height: 80vh;
            border-radius: 2rem;
            padding: 2rem;
            overflow-y: auto;
            position: relative;
        }
        .modal-content h3 {
            color: var(--navy);
            margin-bottom: 1rem;
        }
        .modal-footer {
            display: flex;
            gap: 1rem;
            justify-content: flex-end;
            margin-top: 1.5rem;
            border-top: 1px solid var(--gray);
            padding-top: 1rem;
        }
        .btn-modal {
            padding: 0.6rem 1.5rem;
            border-radius: 30px;
            border: none;
            font-weight: 600;
            cursor: pointer;
        }
        .btn-modal.accept {
            background: var(--gold);
            color: var(--navy);
        }
        .btn-modal.close {
            background: var(--light-gray);
        }

        @media (max-width: 768px) {
            .header-container { flex-direction: column; gap: 1rem; }
            .nav-menu { justify-content: center; }
            .quote-form { grid-template-columns: 1fr; }
            .form-group.full { grid-column: span 1; }
            .hero h1 { font-size: 2.5rem; }
        }