:root {
            --h187-primary: #005bb7;
            --h187-primary-dark: #00448a;
            --h187-accent: #ff8c00;
            --h187-bg: #fdfdfd;
            --h187-text: #1a1a1a;
            --h187-text-light: #666666;
            --h187-card-bg: #ffffff;
            --h187-border: rgba(0, 0, 0, 0.08);
            --h187-radius: 16px;
            --h187-container-width: 1140px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
            background-color: var(--h187-bg);
            color: var(--h187-text);
            line-height: 1.7;
            overflow-x: hidden;
            word-break: keep-all;
            overflow-wrap: break-word;
        }

        /* Layout Helpers */
        .h187-container {
            max-width: var(--h187-container-width);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        .h187-flex {
            display: flex;
            flex-wrap: wrap;
        }

        .h187-grid {
            display: grid;
            gap: 24px;
        }

        /* Typography */
        h1, h2, h3 {
            line-height: 1.3;
            color: #0d1117;
            white-space: normal;
        }

        .h187-fluid-title {
            font-size: clamp(2rem, 4vw + 0.5rem, 3.5rem);
            font-weight: 800;
            margin-bottom: 24px;
        }

        .h187-fluid-subtitle {
            font-size: clamp(1.1rem, 1.5vw + 0.2rem, 1.4rem);
            color: var(--h187-text-light);
            margin-bottom: 32px;
        }

        /* Navigation */
        .h187-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--h187-border);
            padding: 12px 0;
        }

        .h187-nav-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

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

        .h187-logo img {
            height: 48px;
            width: auto;
            display: block;
        }

        .h187-menu {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            list-style: none;
        }

        .h187-menu a {
            text-decoration: none;
            color: var(--h187-text);
            font-weight: 500;
            font-size: 15px;
            padding: 8px 12px;
            border-radius: 8px;
            transition: all 0.3s ease;
        }

        .h187-menu a:hover {
            background: rgba(0, 91, 183, 0.05);
            color: var(--h187-primary);
        }

        .h187-menu a.h187-active {
            color: var(--h187-primary);
            background: rgba(0, 91, 183, 0.08);
        }

        /* Download Hero Section */
        .h187-hero-section {
            padding: 80px 0;
            background: radial-gradient(circle at top right, rgba(0, 91, 183, 0.05), transparent);
            position: relative;
        }

        .h187-hero-card {
            background: white;
            border: 1px solid var(--h187-border);
            border-radius: 24px;
            padding: 48px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.03);
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            align-items: center;
        }

        .h187-hero-info {
            flex: 1;
            min-width: 300px;
        }

        .h187-download-box {
            flex: 0 0 380px;
            min-width: 300px;
            background: #f8fafc;
            border-radius: 20px;
            padding: 32px;
            border: 1px solid var(--h187-border);
        }

        .h187-btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--h187-primary);
            color: white;
            padding: 16px 32px;
            border-radius: 12px;
            text-decoration: none;
            font-weight: 700;
            font-size: 1.1rem;
            width: 100%;
            margin-bottom: 16px;
            transition: transform 0.2s ease, box-shadow 0.2s ease;
            box-shadow: 0 4px 12px rgba(0, 91, 183, 0.2);
        }

        .h187-btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 91, 183, 0.3);
            background: var(--h187-primary-dark);
        }

        .h187-spec-item {
            display: flex;
            justify-content: space-between;
            padding: 10px 0;
            border-bottom: 1px dashed #e2e8f0;
            font-size: 14px;
        }

        .h187-spec-item span:first-child {
            color: var(--h187-text-light);
        }

        .h187-spec-item span:last-child {
            font-weight: 600;
        }

        /* Computational Modes Section */
        .h187-modes-section {
            padding: 96px 0;
        }

        .h187-section-title {
            text-align: center;
            margin-bottom: 64px;
        }

        .h187-modes-grid {
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
        }

        .h187-mode-card {
            background: var(--h187-card-bg);
            padding: 40px;
            border-radius: var(--h187-radius);
            border: 1px solid var(--h187-border);
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .h187-mode-card:hover {
            border-color: var(--h187-primary);
            transform: translateY(-8px);
        }

        .h187-mode-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 100%;
            background: var(--h187-primary);
            opacity: 0;
            transition: opacity 0.3s;
        }

        .h187-mode-card:hover::before {
            opacity: 1;
        }

        .h187-mode-tag {
            display: inline-block;
            background: rgba(0, 91, 183, 0.1);
            color: var(--h187-primary);
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 700;
            margin-bottom: 16px;
            text-transform: uppercase;
        }

        .h187-capability-list {
            margin-top: 20px;
            list-style: none;
        }

        .h187-capability-list li {
            padding-left: 24px;
            position: relative;
            margin-bottom: 10px;
            font-size: 14px;
            color: var(--h187-text-light);
        }

        .h187-capability-list li::before {
            content: "→";
            position: absolute;
            left: 0;
            color: var(--h187-accent);
        }

        .h187-algorithmic-edge {
            margin-top: 24px;
            padding-top: 16px;
            border-top: 1px solid #f1f5f9;
            font-style: italic;
            font-size: 13px;
            color: var(--h187-primary);
        }

        /* Ecosystem Section */
        .h187-ecosystem-section {
            padding: 96px 0;
            background: #0d1117;
            color: #ffffff;
        }

        .h187-ecosystem-section h2 {
            color: #ffffff;
        }

        .h187-scenario-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
        }

        .h187-scenario-item {
            flex: 1;
            min-width: 300px;
            background: rgba(255, 255, 255, 0.05);
            padding: 32px;
            border-radius: 16px;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .h187-scenario-item h3 {
            color: var(--h187-accent);
            margin-bottom: 12px;
        }

        /* Dynamic Section */
        .h187-dynamic-section {
            padding: 80px 0;
            background: #ffffff;
        }

        /* Footer */
        .h187-footer {
            padding: 64px 0 32px;
            border-top: 1px solid var(--h187-border);
            background: #fafafa;
        }

        .h187-footer-inner {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 40px;
        }

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

        .h187-footer-brand h2 {
            font-size: 24px;
            margin-bottom: 16px;
            color: var(--h187-primary);
        }

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

        .h187-footer-group h4 {
            margin-bottom: 20px;
            font-size: 16px;
        }

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

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

        .h187-footer-group a {
            text-decoration: none;
            color: var(--h187-text-light);
            font-size: 14px;
            transition: color 0.3s;
        }

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

        .h187-copyright {
            margin-top: 64px;
            padding-top: 32px;
            border-top: 1px solid var(--h187-border);
            text-align: center;
            font-size: 13px;
            color: var(--h187-text-light);
        }

        /* Responsive */
        @media (max-width: 992px) {
            .h187-hero-card {
                padding: 32px;
                flex-direction: column;
            }
            .h187-download-box {
                flex: 1 1 100%;
            }
        }

        @media (max-width: 768px) {
            .h187-menu {
                display: none; /* In a real scenario, implement a hamburger menu */
            }
            .h187-fluid-title {
                font-size: 2.2rem;
            }
            .h187-modes-grid {
                grid-template-columns: 1fr;
            }
            .h187-scenario-item {
                flex: 1 1 100%;
            }
        }