:root {
            --primary-color: #1a365d;
            --secondary-color: #e63946;
            --accent-color: #f4a261;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --shadow: 0 4px 12px rgba(0,0,0,0.08);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--dark-color);
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--primary-color);
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 3rem;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
        }
        .section-title.text-start:after {
            left: 0;
            transform: none;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95) !important;
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .nav-link {
            font-weight: 600;
            margin: 0 0.5rem;
            transition: var(--transition);
        }
        .nav-link:hover {
            color: var(--secondary-color) !important;
        }
        .hero {
            background: linear-gradient(rgba(26, 54, 93, 0.85), rgba(26, 54, 93, 0.9)), url('https://images.unsplash.com/photo-1607082350899-7e105aa886ae?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') no-repeat center center/cover;
            color: white;
            padding: 10rem 0;
        }
        .hero h1 {
            color: white;
            text-shadow: 1px 1px 3px rgba(0,0,0,0.3);
        }
        .card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
        }
        .card-img-top {
            height: 220px;
            object-fit: cover;
            transition: var(--transition);
        }
        .card:hover .card-img-top {
            transform: scale(1.05);
        }
        .service-icon {
            font-size: 3rem;
            color: var(--secondary-color);
            margin-bottom: 1rem;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.75rem 2rem;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .bg-light-custom {
            background-color: #f8fafc;
        }
        .process-step {
            text-align: center;
            padding: 2rem;
            position: relative;
        }
        .step-number {
            width: 60px;
            height: 60px;
            background: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            font-weight: bold;
            margin: 0 auto 1.5rem;
        }
        .footer {
            background-color: var(--primary-color);
            color: #cbd5e0;
        }
        .footer a {
            color: #cbd5e0;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: white;
            padding-left: 5px;
        }
        .flink {
            display: inline-block;
            padding: 0.5rem 1rem;
            margin: 0.3rem;
            background: rgba(255,255,255,0.1);
            border-radius: 6px;
            transition: var(--transition);
        }
        .flink:hover {
            background: rgba(255,255,255,0.2);
            transform: translateY(-3px);
        }
        .contact-info i {
            width: 40px;
            color: var(--accent-color);
        }
        .testimonial-card {
            background: white;
            border-radius: 12px;
            padding: 2rem;
            box-shadow: var(--shadow);
        }
        .client-logo {
            filter: grayscale(100%);
            opacity: 0.7;
            transition: var(--transition);
            max-height: 60px;
        }
        .client-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .whatsapp-float {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 60px;
            height: 60px;
            background: #25D366;
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            z-index: 1000;
            box-shadow: 0 4px 15px rgba(37, 211, 102, 0.4);
            transition: var(--transition);
        }
        .whatsapp-float:hover {
            transform: scale(1.1);
        }
        .back-to-top {
            position: fixed;
            bottom: 100px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            z-index: 999;
            opacity: 0.7;
            transition: var(--transition);
        }
        .back-to-top:hover {
            opacity: 1;
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero {
                padding: 6rem 0;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .whatsapp-float, .back-to-top {
                width: 50px;
                height: 50px;
                bottom: 20px;
                right: 20px;
                font-size: 1.5rem;
            }
            .back-to-top {
                bottom: 80px;
            }
        }