/* roulang page: index */
:root {
            --primary: #2B6FA7;
            --primary-deep: #1E5580;
            --primary-light: #3D8BC5;
            --accent: #F57C2E;
            --accent-deep: #E0681A;
            --bg: #F8FAFC;
            --bg-alt: #EDF2F7;
            --card-bg: #FFFFFF;
            --text: #1E293B;
            --text-secondary: #64748B;
            --text-light: #94A3B8;
            --success: #10B981;
            --danger: #EF4444;
            --border: #CBD5E1;
            --border-light: #E2E8F0;
            --shadow-card: 0 4px 14px rgba(0, 0, 0, 0.04), 0 1px 3px rgba(0, 0, 0, 0.02);
            --shadow-card-hover: 0 8px 28px rgba(0, 0, 0, 0.07), 0 2px 6px rgba(0, 0, 0, 0.03);
            --shadow-nav: 0 1px 4px rgba(0, 0, 0, 0.04);
            --radius-card: 12px;
            --radius-btn: 8px;
            --radius-input: 6px;
            --radius-lg: 16px;
            --transition: 0.2s ease;
            --font-stack: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
            --container-max: 1200px;
            --nav-height: 64px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-stack);
            color: var(--text);
            background: var(--bg);
            line-height: 1.7;
            min-height: 100vh;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
        }

        ul,
        ol {
            list-style: none;
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========== NAVIGATION ========== */
        #nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--nav-height);
            background: #FFFFFF;
            border-bottom: 1px solid var(--border-light);
            box-shadow: var(--shadow-nav);
            display: flex;
            align-items: center;
            transition: box-shadow var(--transition);
        }
        #nav.scrolled {
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
        }
        #nav .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .nav-logo {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: 0.02em;
            display: flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }
        .nav-logo .logo-icon {
            width: 34px;
            height: 34px;
            border-radius: 8px;
            background: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 0.9rem;
            font-weight: 800;
            flex-shrink: 0;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 6px 0;
            position: relative;
            transition: color var(--transition);
            white-space: nowrap;
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent);
            border-radius: 1px;
            transition: width var(--transition);
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--primary);
        }
        .nav-links a:hover::after,
        .nav-links a.active::after {
            width: 100%;
        }
        .nav-cta-btn {
            background: var(--primary);
            color: #fff !important;
            padding: 9px 20px !important;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 0.9rem;
            transition: background var(--transition), transform var(--transition);
            white-space: nowrap;
        }
        .nav-cta-btn:hover {
            background: var(--accent);
            transform: translateY(-1px);
        }
        .nav-cta-btn::after {
            display: none !important;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 8px;
            z-index: 1001;
            background: none;
            border: none;
        }
        .hamburger span {
            width: 26px;
            height: 2.5px;
            background: var(--primary);
            border-radius: 2px;
            transition: all var(--transition);
            display: block;
        }
        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }
        .mobile-menu {
            display: none;
            position: fixed;
            top: var(--nav-height);
            left: 0;
            right: 0;
            bottom: 0;
            background: #fff;
            z-index: 999;
            flex-direction: column;
            align-items: center;
            justify-content: flex-start;
            padding-top: 40px;
            gap: 20px;
        }
        .mobile-menu.active {
            display: flex;
        }
        .mobile-menu a {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text);
            padding: 10px 24px;
            transition: color var(--transition);
        }
        .mobile-menu a:hover {
            color: var(--accent);
        }
        .mobile-menu .mobile-cta {
            margin-top: 16px;
            background: var(--accent);
            color: #fff;
            padding: 12px 28px;
            border-radius: var(--radius-btn);
            font-weight: 600;
        }

        /* ========== HERO ========== */
        #hero {
            padding-top: calc(var(--nav-height) + 48px);
            padding-bottom: 64px;
            position: relative;
            overflow: hidden;
            background: #FFFFFF;
        }
        #hero::before {
            content: '';
            position: absolute;
            width: 520px;
            height: 520px;
            background: radial-gradient(circle, rgba(43, 111, 167, 0.06) 0%, transparent 70%);
            border-radius: 50%;
            top: -120px;
            right: -80px;
            pointer-events: none;
        }
        #hero::after {
            content: '';
            position: absolute;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(245, 124, 46, 0.05) 0%, transparent 70%);
            border-radius: 50%;
            bottom: -60px;
            left: -40px;
            pointer-events: none;
        }
        #hero .container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
            position: relative;
            z-index: 1;
        }
        .hero-content {
            max-width: 520px;
        }
        .hero-badge {
            display: inline-block;
            background: rgba(245, 124, 46, 0.1);
            color: var(--accent);
            font-size: 0.85rem;
            font-weight: 600;
            padding: 6px 14px;
            border-radius: 20px;
            margin-bottom: 20px;
            letter-spacing: 0.03em;
        }
        .hero-content h1 {
            font-size: 2.25rem;
            font-weight: 700;
            line-height: 1.3;
            color: var(--text);
            margin-bottom: 16px;
            letter-spacing: -0.01em;
        }
        .hero-content h1 .highlight {
            color: var(--primary);
            position: relative;
        }
        .hero-content .hero-subtitle {
            font-size: 1.1rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 32px;
            max-width: 440px;
        }
        .hero-cta-group {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 13px 26px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            min-height: 46px;
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            border: 2px solid var(--primary);
        }
        .btn-primary:hover {
            background: var(--accent);
            border-color: var(--accent);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(245, 124, 46, 0.3);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(43, 111, 167, 0.25);
        }
        .btn-accent {
            background: var(--accent);
            color: #fff;
            border: 2px solid var(--accent);
        }
        .btn-accent:hover {
            background: var(--accent-deep);
            border-color: var(--accent-deep);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(245, 124, 46, 0.35);
        }
        .hero-dashboard {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-light);
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
            position: relative;
        }
        .hero-dashboard::before {
            content: '';
            position: absolute;
            top: -1px;
            left: 20px;
            right: 20px;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--accent), var(--primary));
            border-radius: 0 0 3px 3px;
            opacity: 0.7;
        }
        .dashboard-item {
            text-align: center;
            padding: 8px 4px;
        }
        .dashboard-item .dash-icon {
            font-size: 1.6rem;
            margin-bottom: 6px;
            display: block;
        }
        .dashboard-item .dash-number {
            font-size: 2rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: -0.02em;
            animation: gentleBounce 3s ease-in-out infinite;
            display: inline-block;
        }
        .dashboard-item:nth-child(2) .dash-number {
            animation-delay: 0.5s;
        }
        .dashboard-item:nth-child(3) .dash-number {
            animation-delay: 1s;
        }
        .dashboard-item .dash-label {
            font-size: 0.8rem;
            color: var(--text-secondary);
            margin-top: 2px;
            line-height: 1.4;
        }
        @keyframes gentleBounce {
            0%,
            100% {
                transform: translateY(0);
            }
            30% {
                transform: translateY(-5px);
            }
            60% {
                transform: translateY(-2px);
            }
        }
        .scroll-hint {
            text-align: center;
            margin-top: 32px;
            color: var(--text-light);
            font-size: 1.5rem;
            animation: floatDown 2s ease-in-out infinite;
        }
        @keyframes floatDown {
            0%,
            100% {
                transform: translateY(0);
                opacity: 0.6;
            }
            50% {
                transform: translateY(10px);
                opacity: 1;
            }
        }

        /* ========== SECTIONS GENERAL ========== */
        section {
            padding: 80px 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header .section-tag {
            display: inline-block;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--accent);
            background: rgba(245, 124, 46, 0.08);
            padding: 5px 14px;
            border-radius: 20px;
            margin-bottom: 12px;
            letter-spacing: 0.04em;
            text-transform: uppercase;
        }
        .section-header h2 {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 8px;
            letter-spacing: -0.01em;
        }
        .section-header .section-desc {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 560px;
            margin: 0 auto;
        }

        /* ========== SERVICES ========== */
        #services {
            background: var(--bg);
        }
        .services-grid-main {
            display: grid;
            grid-template-columns: 1fr 1.15fr 1fr;
            gap: 20px;
            margin-bottom: 28px;
        }
        .service-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            padding: 32px 24px 24px;
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
            border: 1px solid transparent;
            position: relative;
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }
        .service-card.featured {
            box-shadow: var(--shadow-card-hover);
            border-color: rgba(43, 111, 167, 0.12);
            padding-top: 36px;
            padding-bottom: 28px;
        }
        .service-card.featured::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
        }
        .service-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-card-hover);
        }
        .service-card .card-img-top {
            height: 100px;
            border-radius: 8px;
            overflow: hidden;
            margin-bottom: 16px;
            background: var(--bg-alt);
            position: relative;
        }
        .service-card .card-img-top img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.85;
        }
        .service-card .service-icon {
            font-size: 2rem;
            margin-bottom: 10px;
            display: block;
            color: var(--primary);
        }
        .service-card h3 {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 6px;
            letter-spacing: -0.01em;
        }
        .service-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
            flex-grow: 1;
        }
        .services-grid-ext {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 14px;
        }
        .service-card-sm {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            padding: 20px 16px;
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
            border: 1px solid transparent;
            text-align: center;
        }
        .service-card-sm:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-card-hover);
            border-color: rgba(43, 111, 167, 0.1);
        }
        .service-card-sm .service-icon-sm {
            font-size: 1.5rem;
            margin-bottom: 8px;
            display: block;
            color: var(--primary);
        }
        .service-card-sm h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 4px;
        }
        .service-card-sm p {
            font-size: 0.8rem;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        /* ========== COMPARISON ========== */
        #comparison {
            background: #FFFFFF;
        }
        .comparison-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
            align-items: stretch;
        }
        .comparison-col {
            border-radius: var(--radius-lg);
            padding: 36px 28px;
            position: relative;
        }
        .comparison-col.pain {
            background: #FEF5F5;
            border: 1px solid rgba(239, 68, 68, 0.15);
        }
        .comparison-col.gain {
            background: #F0F7FB;
            border: 1px solid rgba(16, 185, 129, 0.2);
        }
        .comparison-col h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .comparison-col.pain h3 {
            color: #B91C1C;
        }
        .comparison-col.gain h3 {
            color: #065F46;
        }
        .comparison-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .comparison-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 0.95rem;
            line-height: 1.6;
            color: var(--text);
        }
        .comparison-list .icon-cross {
            color: var(--danger);
            font-weight: 700;
            flex-shrink: 0;
            margin-top: 2px;
        }
        .comparison-list .icon-check {
            color: var(--success);
            font-weight: 700;
            flex-shrink: 0;
            margin-top: 2px;
        }
        .comparison-highlight {
            margin-top: 24px;
            padding: 16px 20px;
            background: #fff;
            border-radius: var(--radius-card);
            text-align: center;
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--primary);
            border: 2px dashed rgba(43, 111, 167, 0.3);
        }
        .comparison-highlight .big-num {
            font-size: 1.8rem;
            color: var(--accent);
            font-weight: 800;
            display: block;
            line-height: 1.2;
        }
        .trust-strip {
            margin-top: 36px;
            text-align: center;
            padding: 20px 0;
            border-top: 1px solid var(--border-light);
        }
        .trust-strip .trust-text {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 14px;
            letter-spacing: 0.03em;
        }
        .trust-logos {
            display: flex;
            justify-content: center;
            gap: 32px;
            flex-wrap: wrap;
        }
        .trust-logo-placeholder {
            width: 80px;
            height: 32px;
            background: var(--bg-alt);
            border-radius: 6px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.7rem;
            color: var(--text-light);
            letter-spacing: 0.04em;
        }

        /* ========== FAQ ========== */
        #faq {
            background: var(--bg);
        }
        .faq-list {
            max-width: 720px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: #fff;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            border: 1px solid transparent;
            transition: border-color var(--transition);
        }
        .faq-item.open {
            border-color: rgba(43, 111, 167, 0.2);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 22px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text);
            background: none;
            border: none;
            cursor: pointer;
            text-align: left;
            gap: 16px;
            letter-spacing: 0.01em;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--bg-alt);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--primary);
            flex-shrink: 0;
            transition: all var(--transition);
        }
        .faq-item.open .faq-icon {
            background: var(--primary);
            color: #fff;
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 22px 20px;
        }
        .faq-answer p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .faq-cta-strip {
            margin-top: 36px;
            text-align: center;
            padding: 28px 24px;
            background: #fff;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            background-image: url('/assets/images/coverpic/cover-4.webp');
            background-size: cover;
            background-position: center;
            position: relative;
            overflow: hidden;
            border-radius: var(--radius-lg);
            border-radius: var(--radius-lg);
        }
        .faq-cta-strip::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(255, 255, 255, 0.88);
            z-index: 0;
            border-radius: var(--radius-lg);
        }
        .faq-cta-strip>* {
            position: relative;
            z-index: 1;
        }
        .faq-cta-strip .faq-cta-text {
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 12px;
        }

        /* ========== CONTACT ========= */
        #contact {
            background: #FFFFFF;
        }
        .contact-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 36px;
            align-items: start;
        }
        .contact-form-card {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            padding: 36px 28px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-light);
        }
        .contact-form-card .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
            margin-bottom: 16px;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 6px;
            margin-bottom: 16px;
        }
        .form-group label {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text);
            letter-spacing: 0.01em;
        }
        .form-group input,
        .form-group textarea {
            padding: 12px 14px;
            border: 1px solid var(--border);
            border-radius: var(--radius-input);
            font-size: 0.95rem;
            color: var(--text);
            background: #FAFBFC;
            transition: all var(--transition);
            outline: none;
            width: 100%;
            resize: vertical;
        }
        .form-group input:focus,
        .form-group textarea:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(43, 111, 167, 0.15);
            background: #fff;
        }
        .form-group textarea {
            min-height: 100px;
        }
        .form-submit-btn {
            width: 100%;
            padding: 14px;
            font-size: 1rem;
            font-weight: 700;
            background: var(--accent);
            color: #fff;
            border: none;
            border-radius: var(--radius-btn);
            cursor: pointer;
            transition: all var(--transition);
            letter-spacing: 0.02em;
        }
        .form-submit-btn:hover {
            background: var(--accent-deep);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(245, 124, 46, 0.3);
        }
        .form-privacy {
            font-size: 0.78rem;
            color: var(--text-light);
            margin-top: 10px;
            text-align: center;
        }
        .contact-info-card {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            padding: 32px 24px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-light);
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .contact-info-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
        }
        .contact-info-item .ci-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(43, 111, 167, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            flex-shrink: 0;
        }
        .contact-info-item .ci-text strong {
            display: block;
            font-size: 0.9rem;
            color: var(--text);
            margin-bottom: 2px;
        }
        .contact-info-item .ci-text span {
            font-size: 0.85rem;
            color: var(--text-secondary);
        }
        .wechat-placeholder {
            width: 120px;
            height: 120px;
            border: 2px dashed var(--border);
            border-radius: var(--radius-card);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.8rem;
            color: var(--text-light);
            text-align: center;
            margin: 0 auto;
            flex-direction: column;
            gap: 4px;
        }

        /* ========== FOOTER ========= */
        #footer {
            background: #1E293B;
            color: #CBD5E1;
            padding: 56px 0 28px;
        }
        #footer .footer-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr 1fr;
            gap: 40px;
            margin-bottom: 36px;
        }
        #footer .footer-col h4 {
            color: #fff;
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 16px;
            letter-spacing: 0.02em;
        }
        #footer .footer-col p {
            font-size: 0.9rem;
            line-height: 1.7;
            color: #94A3B8;
        }
        #footer .footer-col a {
            display: block;
            font-size: 0.9rem;
            color: #94A3B8;
            padding: 4px 0;
            transition: color var(--transition);
        }
        #footer .footer-col a:hover {
            color: #fff;
        }
        #footer .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.82rem;
            color: #64748B;
        }
        .back-to-top {
            position: fixed;
            bottom: 28px;
            right: 28px;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            cursor: pointer;
            box-shadow: 0 4px 16px rgba(43, 111, 167, 0.3);
            z-index: 900;
            opacity: 0;
            pointer-events: none;
            transition: all var(--transition);
            border: none;
        }
        .back-to-top.visible {
            opacity: 1;
            pointer-events: auto;
        }
        .back-to-top:hover {
            background: var(--accent);
            transform: translateY(-3px);
        }

        /* ========== RESPONSIVE ========= */
        @media (max-width: 1024px) {
            #hero .container {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .hero-dashboard {
                grid-template-columns: repeat(3, 1fr);
                max-width: 500px;
            }
            .services-grid-main {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .services-grid-main .service-card:last-child {
                grid-column: span 2;
                max-width: 400px;
                justify-self: center;
            }
            .services-grid-ext {
                grid-template-columns: repeat(2, 1fr);
            }
            .comparison-grid {
                grid-template-columns: 1fr;
            }
            .contact-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            #hero {
                padding-top: calc(var(--nav-height) + 28px);
                padding-bottom: 40px;
            }
            .hero-content h1 {
                font-size: 1.75rem;
            }
            .hero-dashboard {
                grid-template-columns: repeat(3, 1fr);
                gap: 8px;
                padding: 18px 12px;
            }
            .dashboard-item .dash-number {
                font-size: 1.4rem;
            }
            .services-grid-main {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .services-grid-main .service-card:last-child {
                grid-column: span 1;
                max-width: none;
                justify-self: auto;
            }
            .services-grid-ext {
                grid-template-columns: 1fr 1fr;
                gap: 10px;
            }
            .contact-form-card .form-row {
                grid-template-columns: 1fr;
            }
            #footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
                text-align: center;
            }
            #footer .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            section {
                padding: 48px 0;
            }
        }
        @media (max-width: 520px) {
            .hero-content h1 {
                font-size: 1.5rem;
            }
            .hero-cta-group {
                flex-direction: column;
                gap: 10px;
            }
            .hero-cta-group .btn {
                width: 100%;
                justify-content: center;
            }
            .hero-dashboard {
                grid-template-columns: repeat(3, 1fr);
                gap: 4px;
                padding: 12px 6px;
            }
            .dashboard-item .dash-number {
                font-size: 1.1rem;
            }
            .dashboard-item .dash-label {
                font-size: 0.7rem;
            }
            .services-grid-ext {
                grid-template-columns: 1fr;
            }
            .comparison-col {
                padding: 20px 14px;
            }
            .faq-question {
                font-size: 0.9rem;
                padding: 14px 16px;
            }
            .btn {
                padding: 11px 18px;
                font-size: 0.88rem;
                min-height: 40px;
            }
        }