:root {
            --hwo3t-primary: #ff6600;
            --hwo3t-primary-dark: #e65c00;
            --hwo3t-secondary: #2b2d42;
            --hwo3t-bg-light: #f8f9fa;
            --hwo3t-text-main: #333333;
            --hwo3t-text-muted: #666666;
            --hwo3t-white: #ffffff;
            --hwo3t-shadow: 0 10px 30px rgba(0,0,0,0.08);
            --hwo3t-transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
        }

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

        body {
            font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--hwo3t-bg-light);
            color: var(--hwo3t-text-main);
            line-height: 1.7;
            overflow-x: hidden;
        }

        /* Layout & Spacing */
        .hwo3t-container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        .hwo3t-section {
            padding: 96px 0;
            word-break: break-word;
            overflow-wrap: break-word;
        }

        /* Typography */
        h1, h2, h3 {
            line-height: 1.3;
            color: var(--hwo3t-secondary);
            word-break: keep-all;
            white-space: normal;
        }

        .hwo3t-fluid-h1 { font-size: clamp(2rem, 5vw + 1rem, 4rem); font-weight: 800; }
        .hwo3t-fluid-h2 { font-size: clamp(1.5rem, 3vw + 0.5rem, 2.5rem); font-weight: 700; }
        .hwo3t-fluid-p { font-size: clamp(1rem, 1vw + 0.5rem, 1.25rem); }

        /* Navigation */
        .hwo3t-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: var(--hwo3t-transition);
        }

        .hwo3t-nav-wrapper {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            height: 80px;
            min-width: 0;
        }

        .hwo3t-logo {
            flex: 0 0 auto;
            min-width: 0;
        }

        .hwo3t-logo img {
            height: 40px;
            display: block;
        }

        .hwo3t-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 24px;
            min-width: 0;
        }

        .hwo3t-nav-item {
            min-width: 0;
        }

        .hwo3t-nav-link {
            text-decoration: none;
            color: var(--hwo3t-text-main);
            font-weight: 500;
            font-size: 16px;
            padding: 8px 0;
            position: relative;
            transition: var(--hwo3t-transition);
        }

        .hwo3t-nav-link:hover {
            color: var(--hwo3t-primary);
        }

        .hwo3t-nav-link.hwo3t-active {
            color: var(--hwo3t-primary);
        }

        .hwo3t-nav-link.hwo3t-active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: var(--hwo3t-primary);
            border-radius: 2px;
        }

        /* Hero Section - Download Focus */
        .hwo3t-hero {
            padding-top: 160px;
            background: linear-gradient(135deg, #fff 0%, #fff5f0 100%);
            overflow: hidden;
        }

        .hwo3t-hero-grid {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
            min-width: 0;
        }

        .hwo3t-hero-text {
            flex: 1 1 500px;
            min-width: 0;
        }

        .hwo3t-hero-image {
            flex: 1 1 500px;
            min-width: 0;
            position: relative;
        }

        .hwo3t-hero-image img {
            width: 100%;
            height: auto;
            border-radius: 24px;
            box-shadow: var(--hwo3t-shadow);
            transform: perspective(1000px) rotateY(-5deg);
            transition: var(--hwo3t-transition);
        }

        .hwo3t-hero-image:hover img {
            transform: perspective(1000px) rotateY(0deg) translateY(-10px);
        }

        .hwo3t-hero-subtitle {
            margin: 24px 0 40px;
            color: var(--hwo3t-text-muted);
            max-width: 600px;
        }

        .hwo3t-btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            min-width: 0;
        }

        .hwo3t-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 16px 48px;
            border-radius: 50px;
            font-size: 18px;
            font-weight: 600;
            text-decoration: none;
            transition: var(--hwo3t-transition);
            cursor: pointer;
        }

        .hwo3t-btn-primary {
            background: linear-gradient(90deg, var(--hwo3t-primary), #ff8c00);
            color: var(--hwo3t-white);
            box-shadow: 0 10px 20px rgba(255, 102, 0, 0.3);
        }

        .hwo3t-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 30px rgba(255, 102, 0, 0.4);
        }

        /* Scenario Cards */
        .hwo3t-scenario-section {
            background-color: var(--hwo3t-white);
        }

        .hwo3t-grid-layout {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            margin-top: 64px;
        }

        .hwo3t-card {
            background: var(--hwo3t-bg-light);
            border-radius: 20px;
            padding: 40px;
            border: 1px solid rgba(0,0,0,0.03);
            transition: var(--hwo3t-transition);
            display: flex;
            flex-direction: column;
            min-width: 0;
        }

        .hwo3t-card:hover {
            background: var(--hwo3t-white);
            box-shadow: var(--hwo3t-shadow);
            transform: translateY(-8px);
        }

        .hwo3t-card-icon {
            font-size: 40px;
            margin-bottom: 24px;
        }

        .hwo3t-card-title {
            margin-bottom: 16px;
            color: var(--hwo3t-primary);
        }

        .hwo3t-tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: auto;
            padding-top: 24px;
            min-width: 0;
        }

        .hwo3t-tag {
            background: rgba(255, 102, 0, 0.1);
            color: var(--hwo3t-primary);
            padding: 4px 12px;
            border-radius: 6px;
            font-size: 14px;
            font-weight: 500;
        }

        /* Security & Guide Section */
        .hwo3t-feature-row {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
            margin-bottom: 96px;
            min-width: 0;
        }

        .hwo3t-feature-row:nth-child(even) {
            flex-direction: row-reverse;
        }

        .hwo3t-feature-content {
            flex: 1 1 400px;
            min-width: 0;
        }

        .hwo3t-feature-image {
            flex: 1 1 400px;
            min-width: 0;
        }

        .hwo3t-feature-image img {
            width: 100%;
            border-radius: 20px;
            object-fit: cover;
        }

        /* Footer */
        .hwo3t-footer {
            background: var(--hwo3t-secondary);
            color: rgba(255,255,255,0.7);
            padding: 80px 0 40px;
        }

        .hwo3t-footer-top {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            margin-bottom: 64px;
            min-width: 0;
        }

        .hwo3t-footer-brand {
            flex: 1 1 300px;
            min-width: 0;
        }

        .hwo3t-brand-name {
            font-size: 24px;
            font-weight: 800;
            color: var(--hwo3t-white);
            margin-bottom: 16px;
        }

        .hwo3t-footer-links {
            flex: 2 1 600px;
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            min-width: 0;
        }

        .hwo3t-link-col {
            flex: 1 1 150px;
            min-width: 0;
        }

        .hwo3t-link-col h4 {
            color: var(--hwo3t-white);
            margin-bottom: 24px;
        }

        .hwo3t-link-col ul {
            list-style: none;
        }

        .hwo3t-link-col ul li {
            margin-bottom: 12px;
        }

        .hwo3t-link-col a {
            color: inherit;
            text-decoration: none;
            transition: var(--hwo3t-transition);
        }

        .hwo3t-link-col a:hover {
            color: var(--hwo3t-primary);
        }

        .hwo3t-footer-bottom {
            padding-top: 40px;
            border-top: 1px solid rgba(255,255,255,0.1);
            text-align: center;
            font-size: 14px;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .hwo3t-nav-menu {
                display: none; /* In a real project, add a mobile menu toggle */
            }
            .hwo3t-section {
                padding: 64px 0;
            }
            .hwo3t-hero {
                padding-top: 120px;
            }
            .hwo3t-feature-row {
                gap: 32px;
            }
        }

        /* Structure Data (JSON-LD) */