:root {
            --primary: #4f46e5;
            --primary-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
            --rainbow-bg: linear-gradient(120deg, #e0e7ff 0%, #f3e8ff 35%, #ffe4e6 70%, #ecfdf5 100%);
            --rainbow-badge: linear-gradient(90deg, #ef4444, #f59e0b, #10b981, #06b6d4, #6366f1, #8b5cf6);
            --bg-light: #f8fafc;
            --surface: #ffffff;
            --text-dark: #0f172a;
            --text-muted: #475569;
            --border-color: #e2e8f0;
            --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
            --shadow-md: 0 10px 25px -5px rgba(99, 102, 241, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 20px 30px -10px rgba(79, 70, 229, 0.15);
            --radius-md: 12px;
            --radius-lg: 20px;
            --container-max: 1200px;
        }

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

        html {
            scroll-behavior: smooth;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg-light);
            color: var(--text-dark);
            line-height: 1.6;
        }

        body {
            background: var(--bg-light);
            overflow-x: hidden;
        }

        /* Container Standard */
        .container {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Rainbow Top Accent Bar */
        .top-rainbow-bar {
            height: 4px;
            width: 100%;
            background: var(--rainbow-badge);
        }

        /* Header Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }

        .brand-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
        }

        .ai-page-logo {
            max-height: 42px;
            width: auto;
            object-fit: contain;
        }

        /* Requirement rule: .nav-links gap must be 0 */
        .nav-links {
            display: flex;
            align-items: center;
            list-style: none;
            gap: 0;
        }

        .nav-links li a {
            display: inline-block;
            padding: 8px 14px;
            color: var(--text-dark);
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            transition: color 0.2s ease, background-color 0.2s ease;
            border-radius: 6px;
        }

        .nav-links li a:hover,
        .nav-links li a.active {
            color: var(--primary);
            background-color: rgba(99, 102, 241, 0.08);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 22px;
            font-size: 14px;
            font-weight: 600;
            border-radius: 50px;
            text-decoration: none;
            cursor: pointer;
            transition: all 0.25s ease;
            border: none;
            outline: none;
        }

        .btn-rainbow {
            background: var(--primary-gradient);
            color: #ffffff !important;
            box-shadow: 0 4px 15px rgba(99, 102, 241, 0.35);
        }

        .btn-rainbow:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(168, 85, 247, 0.45);
        }

        .btn-outline {
            background: #ffffff;
            color: var(--text-dark);
            border: 1px solid var(--border-color);
        }

        .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: #f4f4ff;
        }

        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            cursor: pointer;
            color: var(--text-dark);
        }

        /* Section Global Styling */
        section {
            padding: 80px 0;
            position: relative;
        }

        .section-tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 30px;
            background: var(--rainbow-badge);
            color: #ffffff;
            font-size: 12px;
            font-weight: 700;
            letter-spacing: 1px;
            margin-bottom: 12px;
            text-transform: uppercase;
        }

        .section-title {
            font-size: 32px;
            font-weight: 800;
            color: var(--text-dark);
            margin-bottom: 16px;
            line-height: 1.3;
        }

        .section-desc {
            font-size: 16px;
            color: var(--text-muted);
            max-width: 720px;
            margin: 0 auto 48px auto;
        }

        .text-center {
            text-align: center;
        }

        /* 首屏 Hero 区域 (严格规定：首屏不得包含任何图片) */
        .hero-section {
            background: var(--rainbow-bg);
            padding: 90px 0 100px 0;
            overflow: hidden;
        }

        .hero-content {
            max-width: 900px;
            margin: 0 auto;
            text-align: center;
        }

        /* H1 字数控制在 20 字以内 */
        .hero-h1 {
            font-size: 42px;
            font-weight: 900;
            line-height: 1.25;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #1e1b4b 0%, #4338ca 50%, #6b21a8 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-sub {
            font-size: 18px;
            color: #334155;
            margin-bottom: 36px;
            font-weight: 400;
            line-height: 1.7;
        }

        .hero-cta-group {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            margin-bottom: 48px;
            flex-wrap: wrap;
        }

        .hero-cta-group .btn {
            padding: 14px 32px;
            font-size: 16px;
        }

        /* Hero Feature Badge Grid (CSS Pure) */
        .hero-badges {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 16px;
            margin-top: 20px;
        }

        .hero-badge-card {
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.6);
            padding: 20px;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            text-align: left;
            transition: transform 0.3s ease;
        }

        .hero-badge-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }

        .hero-badge-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 4px;
        }

        .hero-badge-desc {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* Component: Cards & Grid Layouts */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
        }

        .card {
            background: var(--surface);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px;
            transition: all 0.3s ease;
            box-shadow: var(--shadow-sm);
        }

        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: rgba(99, 102, 241, 0.4);
        }

        .card-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: var(--rainbow-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            margin-bottom: 16px;
            color: var(--primary);
        }

        .card-title {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-dark);
        }

        .card-desc {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* Supported AI Platform Chips */
        .platform-chip-wrapper {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 20px;
            justify-content: center;
        }

        .platform-chip {
            background: #ffffff;
            border: 1px solid #e2e8f0;
            padding: 8px 16px;
            border-radius: 30px;
            font-size: 13px;
            font-weight: 600;
            color: #334155;
            box-shadow: 0 1px 3px rgba(0,0,0,0.05);
            transition: all 0.2s ease;
        }

        .platform-chip:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: #f5f3ff;
        }

        /* Comparison Section */
        .rating-box {
            background: linear-gradient(135deg, #1e1b4b, #312e81);
            color: #ffffff;
            padding: 32px;
            border-radius: var(--radius-lg);
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 32px;
            box-shadow: var(--shadow-lg);
        }

        .rating-left h3 {
            font-size: 24px;
            margin-bottom: 8px;
        }

        .rating-stars {
            color: #fbbf24;
            font-size: 24px;
            letter-spacing: 2px;
        }

        .rating-score {
            text-align: right;
        }

        .score-num {
            font-size: 48px;
            font-weight: 900;
            color: #38bdf8;
            line-height: 1;
        }

        .score-max {
            font-size: 14px;
            color: #94a3b8;
        }

        .table-responsive {
            width: 100%;
            overflow-x: auto;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            background: #ffffff;
        }

        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 650px;
        }

        .comparison-table th, .comparison-table td {
            padding: 16px 20px;
            border-bottom: 1px solid var(--border-color);
            font-size: 14px;
        }

        .comparison-table th {
            background: #f8fafc;
            font-weight: 700;
            color: var(--text-dark);
        }

        .comparison-table tr:hover {
            background: #faf5ff;
        }

        .tag-highlight {
            color: #059669;
            font-weight: 700;
        }

        /* Token Price Table */
        .token-matrix {
            width: 100%;
            border-collapse: collapse;
            background: #ffffff;
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }

        .token-matrix th, .token-matrix td {
            padding: 14px 18px;
            border-bottom: 1px solid var(--border-color);
            font-size: 13px;
        }

        .token-matrix th {
            background: #e0e7ff;
            color: #3730a3;
            font-weight: 700;
        }

        /* FAQ Accordion */
        .faq-accordion {
            max-width: 900px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .faq-item {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color 0.2s ease;
        }

        .faq-header {
            padding: 18px 24px;
            font-weight: 700;
            font-size: 16px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: #ffffff;
            color: var(--text-dark);
            user-select: none;
        }

        .faq-header:hover {
            color: var(--primary);
        }

        .faq-icon {
            font-size: 18px;
            transition: transform 0.3s ease;
        }

        .faq-item.active .faq-icon {
            transform: rotate(180deg);
        }

        .faq-body {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
            background: #f8fafc;
            padding: 0 24px;
        }

        .faq-item.active .faq-body {
            max-height: 500px;
            padding: 16px 24px 20px 24px;
            border-top: 1px solid #f1f5f9;
        }

        .faq-body p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* Reviews Grid */
        .review-card {
            background: #ffffff;
            border-radius: var(--radius-md);
            padding: 24px;
            border: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            box-shadow: var(--shadow-sm);
        }

        .review-user {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 16px;
        }

        .avatar-circle {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary-gradient);
            color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 16px;
        }

        .user-info h5 {
            font-size: 14px;
            color: var(--text-dark);
        }

        .user-info span {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* Contact & Form */
        .contact-wrapper {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            background: #ffffff;
            border-radius: var(--radius-lg);
            padding: 40px;
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-color);
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text-dark);
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            font-size: 14px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            outline: none;
            transition: border-color 0.2s ease;
        }

        .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
        }

        textarea.form-control {
            resize: vertical;
            min-height: 110px;
        }

        .qr-card {
            text-align: center;
            background: var(--rainbow-bg);
            padding: 24px;
            border-radius: var(--radius-md);
            margin-top: 20px;
        }

        .qr-card img {
            max-width: 160px;
            border-radius: 8px;
            box-shadow: var(--shadow-sm);
            margin-bottom: 10px;
        }

        /* Case & Material Images */
        .media-case-img {
            width: 100%;
            border-radius: var(--radius-md);
            object-fit: cover;
            box-shadow: var(--shadow-sm);
        }

        /* Footer */
        .site-footer {
            background: #0f172a;
            color: #94a3b8;
            padding: 60px 0 30px 0;
            font-size: 14px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            color: #ffffff;
            font-size: 16px;
            margin-bottom: 20px;
        }

        .footer-links {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            color: #94a3b8;
            text-decoration: none;
            transition: color 0.2s ease;
        }

        .footer-links a:hover {
            color: #ffffff;
        }

        .friend-links-box {
            background: rgba(255, 255, 255, 0.05);
            padding: 20px;
            border-radius: 8px;
            margin-top: 20px;
        }

        .friend-links-box a {
            color: #cbd5e1;
            margin-right: 14px;
            display: inline-block;
            text-decoration: none;
            margin-bottom: 8px;
        }

        .friend-links-box a:hover {
            color: #38bdf8;
        }

        .footer-bottom {
            border-top: 1px solid #1e293b;
            padding-top: 24px;
            text-align: center;
            font-size: 13px;
        }

        /* Floating Widgets */
        .float-widget {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .float-btn {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: #ffffff;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            color: var(--primary);
            font-size: 20px;
            transition: transform 0.2s ease;
            cursor: pointer;
            border: 1px solid var(--border-color);
        }

        .float-btn:hover {
            transform: scale(1.1);
        }

        /* Responsive Breakpoints */
        @media (max-width: 1024px) {
            .grid-4, .grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 72px;
                left: 0;
                width: 100%;
                background: #ffffff;
                flex-direction: column;
                padding: 20px;
                box-shadow: var(--shadow-md);
                border-bottom: 1px solid var(--border-color);
            }

            .nav-links.active {
                display: flex;
            }

            .nav-links li {
                width: 100%;
                text-align: center;
                margin-bottom: 8px;
            }

            .mobile-menu-toggle {
                display: block;
            }

            .hero-h1 {
                font-size: 28px;
            }

            .hero-sub {
                font-size: 15px;
            }

            .grid-2, .grid-3, .grid-4 {
                grid-template-columns: 1fr;
            }

            .contact-wrapper {
                grid-template-columns: 1fr;
                padding: 20px;
            }

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

            .rating-box {
                flex-direction: column;
                text-align: center;
                gap: 16px;
            }

            .rating-score {
                text-align: center;
            }
        }