/* CSS Variable System */
        :root {
            --su4j14-primary: #ff8c00;
            --su4j14-primary-dark: #e67e00;
            --su4j14-dark: #12141d;
            --su4j14-gray: #f8f9fa;
            --su4j14-text: #2d3436;
            --su4j14-text-light: #636e72;
            --su4j14-white: #ffffff;
            --su4j14-accent: #00cec9;
            --su4j14-radius: 16px;
            --su4j14-shadow: 0 10px 30px rgba(0,0,0,0.08);
            --su4j14-container: 1140px;
        }

        /* Base Reset */
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--su4j14-text);
            line-height: 1.6;
            background-color: var(--su4j14-white);
            overflow-x: hidden;
            word-break: keep-all;
        }

        /* Typography */
        h1, h2, h3 { line-height: 1.2; word-break: break-word; font-weight: 800; }
        p { line-height: 1.8; word-break: break-word; overflow-wrap: break-word; }

        /* Navigation */
        .su4j14-navbar {
            position: fixed;
            top: 0; width: 100%;
            height: 80px;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            z-index: 1000;
            border-bottom: 1px solid rgba(0,0,0,0.05);
            display: flex;
            align-items: center;
        }
        .su4j14-nav-container {
            max-width: var(--su4j14-container);
            margin: 0 auto;
            width: 100%;
            padding: 0 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .su4j14-logo { min-width: 0; }
        .su4j14-logo img { height: 40px; width: auto; }
        
        .su4j14-menu {
            display: flex;
            list-style: none;
            gap: 24px;
            flex-wrap: wrap;
            min-width: 0;
        }
        .su4j14-menu a {
            text-decoration: none;
            color: var(--su4j14-text);
            font-size: 0.95rem;
            font-weight: 500;
            transition: color 0.3s;
        }
        .su4j14-menu a:hover, .su4j14-menu a.su4j14-active { color: var(--su4j14-primary); }

        /* Hero Download Section */
        .su4j14-hero {
            padding: 160px 24px 80px;
            background: radial-gradient(circle at top right, #fff9f0, #ffffff);
            text-align: center;
        }
        .su4j14-hero-content {
            max-width: 900px;
            margin: 0 auto;
        }
        .su4j14-hero h1 {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            margin-bottom: 24px;
            color: var(--su4j14-dark);
        }
        .su4j14-hero p {
            font-size: clamp(1rem, 1vw + 0.5rem, 1.25rem);
            color: var(--su4j14-text-light);
            margin-bottom: 48px;
        }

        /* Download Tiers Grid */
        .su4j14-tiers-wrapper {
            max-width: var(--su4j14-container);
            margin: -40px auto 80px;
            padding: 0 24px;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
        }
        .su4j14-tier-card {
            background: var(--su4j14-white);
            border-radius: var(--su4j14-radius);
            padding: 48px 32px;
            box-shadow: var(--su4j14-shadow);
            border: 1px solid rgba(0,0,0,0.03);
            display: flex;
            flex-direction: column;
            transition: transform 0.3s ease;
            min-width: 0;
        }
        .su4j14-tier-card:hover { transform: translateY(-10px); }
        .su4j14-tier-card.su4j14-featured {
            border: 2px solid var(--su4j14-primary);
            position: relative;
        }
        .su4j14-tier-badge {
            position: absolute;
            top: -15px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--su4j14-primary);
            color: white;
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: bold;
        }
        .su4j14-tier-card h3 { font-size: 1.5rem; margin-bottom: 16px; }
        .su4j14-tier-img {
            width: 100%;
            height: 200px;
            object-fit: contain;
            margin-bottom: 24px;
        }
        .su4j14-feature-list {
            list-style: none;
            margin-bottom: 32px;
            flex-grow: 1;
        }
        .su4j14-feature-list li {
            padding: 12px 0;
            border-bottom: 1px solid #f0f0f0;
            font-size: 0.95rem;
            color: var(--su4j14-text-light);
            display: flex;
            align-items: center;
        }
        .su4j14-feature-list li::before {
            content: "✓";
            color: var(--su4j14-primary);
            margin-right: 10px;
            font-weight: bold;
        }
        .su4j14-btn {
            display: inline-block;
            padding: 16px 32px;
            background: var(--su4j14-primary);
            color: white;
            text-decoration: none;
            border-radius: 12px;
            font-weight: 600;
            text-align: center;
            transition: background 0.3s;
        }
        .su4j14-btn:hover { background: var(--su4j14-primary-dark); }
        .su4j14-btn-outline {
            background: transparent;
            border: 2px solid var(--su4j14-primary);
            color: var(--su4j14-primary);
        }
        .su4j14-btn-outline:hover { background: var(--su4j14-primary); color: white; }

        /* Comparison Section */
        .su4j14-section {
            padding: 96px 24px;
            max-width: var(--su4j14-container);
            margin: 0 auto;
        }
        .su4j14-flex-row {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
        }
        .su4j14-flex-col {
            flex: 1;
            min-width: 300px;
        }
        .su4j14-section-title {
            font-size: 2.5rem;
            margin-bottom: 24px;
            position: relative;
        }
        .su4j14-section-title::after {
            content: "";
            display: block;
            width: 60px;
            height: 4px;
            background: var(--su4j14-primary);
            margin-top: 16px;
        }
        .su4j14-img-box {
            border-radius: var(--su4j14-radius);
            overflow: hidden;
            box-shadow: var(--su4j14-shadow);
        }
        .su4j14-img-box img { width: 100%; height: auto; display: block; }

        /* Tech Feature Grid */
        .su4j14-tech-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            margin-top: 48px;
        }
        .su4j14-tech-item {
            background: var(--su4j14-gray);
            padding: 40px;
            border-radius: var(--su4j14-radius);
            min-width: 0;
        }
        .su4j14-tech-item h4 {
            color: var(--su4j14-primary);
            font-size: 1.25rem;
            margin-bottom: 16px;
        }
        .su4j14-benefit {
            margin-top: 16px;
            font-weight: 600;
            color: var(--su4j14-dark);
            font-size: 0.9rem;
        }

        /* Workflow */
        .su4j14-workflow-container {
            background: var(--su4j14-dark);
            color: white;
            padding: 96px 24px;
            border-radius: 40px;
            margin: 48px 24px;
        }
        .su4j14-steps {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            justify-content: space-between;
        }
        .su4j14-step-card {
            flex: 1;
            min-width: 260px;
            position: relative;
        }
        .su4j14-step-num {
            font-size: 4rem;
            font-weight: 900;
            opacity: 0.2;
            line-height: 1;
        }
        .su4j14-step-content {
            margin-top: -20px;
        }
        .su4j14-step-content h3 { color: var(--su4j14-primary); margin-bottom: 12px; }

        /* Footer */
        .su4j14-footer {
            background: #fdfdfd;
            padding: 80px 24px 40px;
            border-top: 1px solid #eee;
        }
        .su4j14-footer-grid {
            max-width: var(--su4j14-container);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
        }
        .su4j14-footer-brand h2 { font-size: 1.8rem; margin-bottom: 16px; color: var(--su4j14-primary); }
        .su4j14-footer-links h4 { margin-bottom: 24px; font-size: 1.1rem; }
        .su4j14-footer-links ul { list-style: none; }
        .su4j14-footer-links li { margin-bottom: 12px; }
        .su4j14-footer-links a { text-decoration: none; color: var(--su4j14-text-light); transition: 0.3s; }
        .su4j14-footer-links a:hover { color: var(--su4j14-primary); }
        .su4j14-copyright {
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid #eee;
            color: var(--su4j14-text-light);
            font-size: 0.9rem;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .su4j14-navbar { height: auto; padding: 16px 0; }
            .su4j14-menu { display: none; } /* Simplified for demo, usually a hamburger */
            .su4j14-hero { padding: 120px 24px 60px; }
            .su4j14-flex-row { gap: 32px; }
            .su4j14-tiers-wrapper { margin-top: 0; }
        }