.container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* --- SECTION 1: DOMAIN & HOSTING --- */
        .infrastructure-section {
            padding: 60px 0;
        }

        .section-header {
            text-align: center;
            margin-bottom: 40px;
        }

        .section-subtitle {
            color: #2563eb;
            font-weight: 700;
            text-transform: uppercase;
            font-size: 0.875rem;
            letter-spacing: 1px;
            margin-bottom: 8px;
        }

        .section-title {
            font-size: 2.25rem;
            color: #0f172a;
            font-weight: 800;
        }

        /* --- DOMAIN SEARCH BOX --- */
        .domain-search-wrapper {
            background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
            border-radius: 16px;
            padding: 40px 30px;
            color: #ffffff;
            box-shadow: 0 10px 25px -5px rgba(37, 99, 235, 0.3);
            margin-bottom: 50px;
        }

        .domain-search-header {
            text-align: center;
            margin-bottom: 25px;
        }

        .domain-search-header h3 {
            font-size: 1.5rem;
            margin-bottom: 6px;
        }

        .domain-search-header p {
            color: #93c5fd;
            font-size: 0.95rem;
        }

        .domain-form {
            display: flex;
            max-width: 750px;
            margin: 0 auto;
            background: #ffffff;
            border-radius: 50px;
            padding: 6px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }

        .domain-input {
            flex: 1;
            border: none;
            outline: none;
            padding: 12px 24px;
            font-size: 1rem;
            border-radius: 50px;
            color: #1e293b;
        }

        .domain-btn {
            background-color: #f59e0b;
            color: #ffffff;
            border: none;
            padding: 12px 32px;
            font-size: 1rem;
            font-weight: 700;
            border-radius: 50px;
            cursor: pointer;
            transition: background-color 0.2s ease, transform 0.1s ease;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .domain-btn:hover {
            background-color: #d97706;
        }

        /* Domain Extensions Badge */
        .domain-extensions {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 25px;
        }

        .ext-badge {
            background: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(5px);
            border: 1px solid rgba(255, 255, 255, 0.2);
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.875rem;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .ext-badge strong {
            color: #fef08a;
        }

        /* --- HOSTING CARDS GRID --- */
        .hosting-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .hosting-card {
            background: #ffffff;
            border-radius: 16px;
            border: 1px solid #e2e8f0;
            padding: 32px 24px;
            transition: all 0.3s ease;
            position: relative;
            display: flex;
            flex-direction: column;
        }

        .hosting-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.08);
            border-color: #93c5fd;
        }

        /* Card Nổi bật */
        .hosting-card.popular {
            border: 2px solid #2563eb;
            box-shadow: 0 10px 20px -5px rgba(37, 99, 235, 0.15);
        }

        .popular-badge {
            position: absolute;
            top: -14px;
            left: 50%;
            transform: translateX(-50%);
            background: #2563eb;
            color: #ffffff;
            font-size: 0.75rem;
            font-weight: 700;
            text-transform: uppercase;
            padding: 4px 16px;
            border-radius: 20px;
            letter-spacing: 0.5px;
        }

        .card-icon {
            width: 48px;
            height: 48px;
            background: #eff6ff;
            color: #2563eb;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            margin-bottom: 16px;
        }

        .card-title {
            font-size: 1.25rem;
            color: #0f172a;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .card-desc {
            font-size: 0.875rem;
            color: #64748b;
            margin-bottom: 20px;
            min-height: 40px;
        }

        .card-price {
            font-size: 1.75rem;
            font-weight: 800;
            color: #2563eb;
            margin-bottom: 20px;
        }

        .card-price span {
            font-size: 0.875rem;
            font-weight: 400;
            color: #64748b;
        }

        .card-features {
            list-style: none;
            margin-bottom: 30px;
            flex-grow: 1;
        }

        .card-features li {
            font-size: 0.9rem;
            color: #334155;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .card-features li i {
            color: #10b981;
            font-size: 0.875rem;
        }

        .card-btn {
            display: block;
            text-align: center;
            background: #f1f5f9;
            color: #0f172a;
            text-decoration: none;
            font-weight: 700;
            padding: 12px 0;
            border-radius: 8px;
            transition: all 0.2s ease;
        }

        .card-btn:hover {
            background: #e2e8f0;
        }

        .hosting-card.popular .card-btn {
            background: #2563eb;
            color: #ffffff;
        }

        .hosting-card.popular .card-btn:hover {
            background: #1d4ed8;
        }

        .domain-result {
            padding: 14px 20px;
            border-radius: 10px;
            font-size: 0.95rem;
            line-height: 1.5;
            text-align: center;
            transition: all 0.3s ease;
        }

        .domain-result.loading {
            background-color: #f1f5f9;
            color: #475569;
            border: 1px solid #cbd5e1;
        }

        .domain-result.available {
            background-color: #f0fdf4;
            color: #166534;
            border: 1px solid #bbf7d0;
        }

        .domain-result.taken {
            background-color: #fef2f2;
            color: #991b1b;
            border: 1px solid #fecaca;
        }

        .domain-result.warning {
            background-color: #fffbebfb;
            color: #92400e;
            border: 1px solid #fde68a;
        }

        .domain-result .btn-register-link {
            display: inline-block;
            margin-left: 10px;
            padding: 4px 12px;
            background-color: #16a34a;
            color: #ffffff;
            border-radius: 6px;
            text-decoration: none;
            font-weight: 600;
            font-size: 0.85rem;
        }

        .domain-result .btn-register-link:hover {
            background-color: #15803d;
        }
        /* --- RESPONSIVE MEDIA QUERIES --- */
        /* Màn hình Tablet (dưới 992px) */
        @media (max-width: 992px) {
            .hosting-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        /* Màn hình Mobile (dưới 640px) */
        @media (max-width: 640px) {
            .section-title {
                font-size: 1.75rem;
            }

            .domain-search-wrapper {
                padding: 24px 16px;
            }

            .domain-form {
                flex-direction: column;
                background: transparent;
                box-shadow: none;
                gap: 10px;
            }

            .domain-input {
                width: 100%;
                border-radius: 8px;
            }

            .domain-btn {
                width: 100%;
                justify-content: center;
                border-radius: 8px;
            }

            .hosting-grid {
                grid-template-columns: 1fr;
            }
        }