:root {
            --h187-primary: #004a99;
            --h187-accent: #ff8c00;
            --h187-text: #2d3748;
            --h187-light-bg: #f7fafc;
            --h187-white: #ffffff;
            --h187-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            --h187-radius: 16px;
            --h187-max-w: 1100px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
            color: var(--h187-text);
            line-height: 1.6;
            background-color: var(--h187-white);
            word-break: keep-all;
            overflow-x: hidden;
        }

        /* Navigation */
        .h187-nav-wrapper {
            position: fixed;
            top: 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);
            transition: all 0.3s ease;
        }

        .h187-nav-container {
            max-width: var(--h187-max-w);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 16px 24px;
        }

        .h187-logo {
            flex-shrink: 0;
            min-width: 0;
        }

        .h187-logo img {
            height: 40px;
            width: auto;
            display: block;
        }

        .h187-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 16px;
        }

        .h187-menu li {
            min-width: 0;
        }

        .h187-menu a {
            text-decoration: none;
            color: var(--h187-text);
            font-weight: 500;
            font-size: 0.95rem;
            padding: 8px 4px;
            transition: color 0.3s;
            position: relative;
        }

        .h187-menu a:hover, .h187-menu a.h187-active {
            color: var(--h187-primary);
        }

        .h187-menu a.h187-active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--h187-primary);
        }

        /* Hero Section */
        .h187-hero {
            padding: 160px 24px 80px;
            background: linear-gradient(135deg, #f0f7ff 0%, #ffffff 100%);
            position: relative;
            overflow: hidden;
        }

        .h187-hero-content {
            max-width: var(--h187-max-w);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
        }

        .h187-hero-text {
            flex: 1;
            min-width: 320px;
            word-break: break-word;
        }

        .h187-hero-title {
            font-size: clamp(2rem, 4vw + 0.5rem, 3.5rem);
            font-weight: 800;
            line-height: 1.2;
            color: var(--h187-primary);
            margin-bottom: 24px;
        }

        .h187-hero-subtitle {
            font-size: clamp(1rem, 1.5vw + 0.2rem, 1.25rem);
            color: #4a5568;
            margin-bottom: 32px;
            max-width: 600px;
        }

        .h187-hero-image {
            flex: 1;
            min-width: 320px;
            border-radius: var(--h187-radius);
            box-shadow: var(--h187-shadow);
            overflow: hidden;
            transform: perspective(1000px) rotateY(-5deg);
            transition: transform 0.5s ease;
        }

        .h187-hero-image:hover {
            transform: perspective(1000px) rotateY(0deg);
        }

        .h187-hero-image img {
            width: 100%;
            height: auto;
            display: block;
        }

        /* Download Section */
        .h187-download-grid {
            padding: 80px 24px;
            max-width: var(--h187-max-w);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
        }

        .h187-card {
            background: var(--h187-white);
            padding: 40px;
            border-radius: var(--h187-radius);
            border: 1px solid #edf2f7;
            box-shadow: 0 4px 6px rgba(0,0,0,0.02);
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
            min-width: 0;
            word-break: break-word;
        }

        .h187-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--h187-shadow);
        }

        .h187-card-title {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--h187-primary);
        }

        .h187-card-list {
            list-style: none;
            margin-bottom: 32px;
            flex-grow: 1;
        }

        .h187-card-list li {
            margin-bottom: 12px;
            padding-left: 24px;
            position: relative;
            font-size: 0.95rem;
        }

        .h187-card-list li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--h187-accent);
            font-weight: bold;
        }

        .h187-btn {
            display: inline-block;
            background: var(--h187-primary);
            color: white;
            text-align: center;
            padding: 16px 32px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s;
            border: none;
            cursor: pointer;
        }

        .h187-btn:hover {
            background: var(--h187-accent);
            transform: scale(1.02);
        }

        /* Platform Section */
        .h187-platform {
            background: var(--h187-light-bg);
            padding: 96px 24px;
        }

        .h187-section-inner {
            max-width: var(--h187-max-w);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
            align-items: center;
        }

        .h187-platform-img {
            flex: 1;
            min-width: 320px;
        }

        .h187-platform-img img {
            width: 100%;
            border-radius: var(--h187-radius);
            box-shadow: var(--h187-shadow);
        }

        .h187-platform-text {
            flex: 1;
            min-width: 320px;
            word-break: break-word;
        }

        .h187-section-tag {
            color: var(--h187-accent);
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 2px;
            display: block;
            margin-bottom: 16px;
        }

        /* Modes Section */
        .h187-modes {
            padding: 96px 24px;
            max-width: var(--h187-max-w);
            margin: 0 auto;
        }

        .h187-mode-item {
            display: flex;
            flex-wrap: wrap;
            margin-bottom: 64px;
            gap: 32px;
            background: #fff;
            border-bottom: 1px solid #eee;
            padding-bottom: 32px;
        }

        .h187-mode-header {
            flex: 0 0 300px;
            min-width: 0;
        }

        .h187-mode-header h3 {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: var(--h187-primary);
        }

        .h187-algo-edge {
            background: #fff5eb;
            color: #c05621;
            padding: 8px 16px;
            border-radius: 8px;
            font-size: 0.85rem;
            font-weight: 600;
        }

        .h187-mode-details {
            flex: 1;
            min-width: 320px;
        }

        /* History Section */
        .h187-history {
            padding: 120px 24px;
            background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('images/version_history.jpg');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            color: white;
            text-align: center;
        }

        .h187-history-box {
            max-width: 800px;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            padding: 48px;
            border-radius: var(--h187-radius);
            border: 1px solid rgba(255,255,255,0.2);
        }

        /* Ecosystem Section */
        .h187-ecosystem {
            padding: 96px 24px;
            max-width: var(--h187-max-w);
            margin: 0 auto;
        }

        .h187-eco-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            margin-top: 48px;
        }

        .h187-eco-card {
            flex: 1;
            min-width: 280px;
            background: #f8fafc;
            padding: 32px;
            border-radius: var(--h187-radius);
            word-break: break-word;
        }

        /* Dynamic Content Section */
        .h187-dynamic-news {
            padding: 80px 24px;
            background: var(--h187-white);
        }

        /* Footer */
        .h187-footer {
            background: #1a202c;
            color: #a0aec0;
            padding: 80px 24px 40px;
        }

        .h187-footer-container {
            max-width: var(--h187-max-w);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
        }

        .h187-footer-brand {
            flex: 0 0 300px;
            min-width: 0;
        }

        .h187-footer-brand h2 {
            color: white;
            margin-bottom: 16px;
        }

        .h187-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
        }

        .h187-footer-group h4 {
            color: white;
            margin-bottom: 24px;
        }

        .h187-footer-group ul {
            list-style: none;
        }

        .h187-footer-group li {
            margin-bottom: 12px;
        }

        .h187-footer-group a {
            color: #a0aec0;
            text-decoration: none;
            transition: color 0.3s;
        }

        .h187-footer-group a:hover {
            color: var(--h187-accent);
        }

        .h187-copyright {
            text-align: center;
            margin-top: 64px;
            padding-top: 32px;
            border-top: 1px solid #2d3748;
            font-size: 0.85rem;
        }

        /* Responsive Breakpoints */
        @media (max-width: 768px) {
            .h187-menu {
                display: none; /* In real project, use a hamburger menu */
            }
            .h187-hero-image {
                transform: none;
            }
            .h187-mode-header {
                flex: 0 0 100%;
            }
        }