:root {
            --su4j14-primary: #ff6600;
            --su4j14-primary-dark: #e65c00;
            --su4j14-secondary: #001e3c;
            --su4j14-text: #333333;
            --su4j14-text-light: #666666;
            --su4j14-bg-light: #f8f9fa;
            --su4j14-white: #ffffff;
            --su4j14-shadow: 0 10px 30px rgba(0,0,0,0.08);
            --su4j14-radius: 16px;
            --su4j14-container: 1100px;
        }

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--su4j14-text);
            line-height: 1.6;
            background-color: var(--su4j14-white);
            overflow-x: hidden;
        }

        /* Typography */
        h1, h2, h3 {
            line-height: 1.2;
            word-break: keep-all;
            white-space: normal;
        }

        p {
            line-height: 1.8;
            word-break: break-word;
            overflow-wrap: break-word;
        }

        /* Layout Utilities */
        .su4j14-container {
            max-width: var(--su4j14-container);
            margin: 0 auto;
            padding: 0 24px;
        }

        .su4j14-flex {
            display: flex;
            flex-wrap: wrap;
        }

        .su4j14-flex > * {
            min-width: 0;
        }

        /* Navigation */
        .su4j14-nav-wrapper {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            padding: 16px 0;
        }

        .su4j14-nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

        .su4j14-logo img {
            height: 32px;
            display: block;
        }

        .su4j14-menu {
            display: flex;
            list-style: none;
            gap: 24px;
            flex-wrap: wrap;
        }

        .su4j14-menu a {
            text-decoration: none;
            color: var(--su4j14-secondary);
            font-weight: 500;
            font-size: 15px;
            transition: color 0.3s;
        }

        .su4j14-menu a:hover {
            color: var(--su4j14-primary);
        }

        .su4j14-menu a.active {
            color: var(--su4j14-primary);
            border-bottom: 2px solid var(--su4j14-primary);
        }

        /* Hero Section */
        .su4j14-hero {
            padding: 160px 0 96px;
            background: linear-gradient(135deg, #001e3c 0%, #003366 100%);
            color: var(--su4j14-white);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .su4j14-hero::after {
            content: '';
            position: absolute;
            bottom: -50px;
            left: 0;
            width: 100%;
            height: 100px;
            background: var(--su4j14-white);
            transform: skewY(-2deg);
        }

        .su4j14-hero-title {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            margin-bottom: 24px;
            max-width: 900px;
            margin-left: auto;
            margin-right: auto;
        }

        .su4j14-hero-subtitle {
            font-size: clamp(1rem, 1.5vw + 0.5rem, 1.25rem);
            opacity: 0.9;
            max-width: 700px;
            margin: 0 auto 48px;
        }

        .su4j14-download-card {
            background: var(--su4j14-white);
            padding: 48px;
            border-radius: var(--su4j14-radius);
            box-shadow: 0 20px 50px rgba(0,0,0,0.2);
            color: var(--su4j14-text);
            max-width: 600px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }

        .su4j14-btn-main {
            display: inline-block;
            background: var(--su4j14-primary);
            color: var(--su4j14-white);
            padding: 20px 48px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: bold;
            font-size: 1.25rem;
            transition: transform 0.3s, background 0.3s, box-shadow 0.3s;
            box-shadow: 0 10px 20px rgba(255, 102, 0, 0.3);
            margin-bottom: 16px;
        }

        .su4j14-btn-main:hover {
            transform: translateY(-3px);
            background: var(--su4j14-primary-dark);
            box-shadow: 0 15px 30px rgba(255, 102, 0, 0.4);
        }

        /* Tech Section */
        .su4j14-section {
            padding: 96px 0;
        }

        .su4j14-section-title {
            text-align: center;
            font-size: clamp(1.5rem, 3vw, 2.5rem);
            margin-bottom: 64px;
            color: var(--su4j14-secondary);
        }

        .su4j14-grid-tech {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
        }

        .su4j14-tech-card {
            padding: 40px;
            border: 1px solid #eee;
            border-radius: var(--su4j14-radius);
            transition: all 0.3s ease;
        }

        .su4j14-tech-card:hover {
            border-color: var(--su4j14-primary);
            transform: translateY(-5px);
            box-shadow: var(--su4j14-shadow);
        }

        .su4j14-tech-icon {
            font-size: 40px;
            margin-bottom: 24px;
            color: var(--su4j14-primary);
        }

        .su4j14-tech-name {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: var(--su4j14-secondary);
        }

        .su4j14-tech-benefit {
            display: inline-block;
            margin-top: 16px;
            padding: 4px 12px;
            background: #fff0e6;
            color: var(--su4j14-primary);
            font-size: 0.85rem;
            border-radius: 4px;
            font-weight: bold;
        }

        /* Workflow Section */
        .su4j14-bg-alt {
            background-color: var(--su4j14-bg-light);
        }

        .su4j14-workflow-steps {
            display: flex;
            flex-direction: column;
            gap: 48px;
        }

        .su4j14-step-item {
            display: flex;
            align-items: flex-start;
            gap: 32px;
            background: var(--su4j14-white);
            padding: 32px;
            border-radius: var(--su4j14-radius);
            box-shadow: var(--su4j14-shadow);
        }

        .su4j14-step-number {
            font-size: 3rem;
            font-weight: 900;
            color: #eee;
            line-height: 1;
        }

        .su4j14-step-content h3 {
            font-size: 1.5rem;
            margin-bottom: 12px;
            color: var(--su4j14-primary);
        }

        /* Access Tiers */
        .su4j14-tier-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
            margin-top: 48px;
        }

        .su4j14-tier-card {
            background: var(--su4j14-white);
            border-radius: var(--su4j14-radius);
            padding: 48px 32px;
            text-align: center;
            border: 1px solid #eee;
            display: flex;
            flex-direction: column;
        }

        .su4j14-tier-card.featured {
            border: 2px solid var(--su4j14-primary);
            transform: scale(1.05);
            z-index: 2;
        }

        .su4j14-tier-name {
            font-size: 1.75rem;
            margin-bottom: 24px;
            color: var(--su4j14-secondary);
        }

        .su4j14-tier-features {
            list-style: none;
            margin: 24px 0;
            text-align: left;
            flex-grow: 1;
        }

        .su4j14-tier-features li {
            padding: 12px 0;
            border-bottom: 1px solid #f0f0f0;
            font-size: 0.95rem;
        }

        .su4j14-tier-features li::before {
            content: '✓';
            color: var(--su4j14-primary);
            margin-right: 12px;
            font-weight: bold;
        }

        /* Footer */
        .su4j14-footer {
            background: var(--su4j14-secondary);
            color: rgba(255,255,255,0.7);
            padding: 80px 0 40px;
        }

        .su4j14-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
        }

        .su4j14-footer-brand {
            font-size: 1.5rem;
            font-weight: bold;
            color: var(--su4j14-white);
            margin-bottom: 24px;
        }

        .su4j14-footer-links h4 {
            color: var(--su4j14-white);
            margin-bottom: 24px;
        }

        .su4j14-footer-links ul {
            list-style: none;
        }

        .su4j14-footer-links li {
            margin-bottom: 12px;
        }

        .su4j14-footer-links a {
            color: inherit;
            text-decoration: none;
            transition: color 0.3s;
        }

        .su4j14-footer-links a:hover {
            color: var(--su4j14-primary);
        }

        .su4j14-copyright {
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .su4j14-menu {
                display: none; /* In a real app, implement a hamburger menu */
            }
            .su4j14-tier-card.featured {
                transform: none;
            }
            .su4j14-hero-title {
                font-size: 2rem;
            }
            .su4j14-step-item {
                flex-direction: column;
                gap: 16px;
            }
            .su4j14-section {
                padding: 64px 0;
            }
        }