:root {
            --h187-primary: #f38020; /* WinMerge Orange */
            --h187-secondary: #2c3e50;
            --h187-bg-light: #f8f9fa;
            --h187-bg-dark: #1a1a1a;
            --h187-text-main: #333333;
            --h187-text-muted: #666666;
            --h187-white: #ffffff;
            --h187-border: #e1e4e8;
            --h187-shadow: 0 10px 30px rgba(0,0,0,0.08);
            --h187-max-width: 1320px;
        }

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

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

        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
        }

        ul {
            list-style: none;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

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

        /* --- Header & Navigation --- */
        .h187-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--h187-border);
            padding: 16px 0;
        }

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

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

        .h187-logo img {
            height: 40px;
        }

        .h187-nav {
            flex: 1 1 auto;
            min-width: 0;
        }

        .h187-nav-list {
            display: flex;
            flex-wrap: wrap;
            justify-content: flex-end;
            gap: 8px;
        }

        .h187-nav-item {
            min-width: 0;
        }

        .h187-nav-link {
            display: block;
            padding: 8px 16px;
            font-size: 14px;
            font-weight: 500;
            color: var(--h187-secondary);
            border-radius: 6px;
        }

        .h187-nav-link:hover {
            color: var(--h187-primary);
            background: rgba(243, 128, 32, 0.05);
        }

        .h187-nav-link.active {
            color: var(--h187-white);
            background: var(--h187-primary);
        }

        /* --- Hero Section --- */
        .h187-hero {
            padding: 96px 0 64px;
            background: linear-gradient(135deg, #fdfdfd 0%, #f5f7fa 100%);
            position: relative;
            overflow: hidden;
        }

        .h187-hero::before {
            content: "";
            position: absolute;
            top: -10%;
            right: -5%;
            width: 40%;
            height: 80%;
            background: radial-gradient(circle, rgba(243, 128, 32, 0.05) 0%, transparent 70%);
            z-index: 0;
        }

        .h187-hero-inner {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            position: relative;
            z-index: 1;
        }

        .h187-hero-text {
            flex: 1 1 600px;
            min-width: 0;
            padding-right: 48px;
        }

        .h187-hero-title {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            line-height: 1.2;
            font-weight: 800;
            color: var(--h187-secondary);
            margin-bottom: 24px;
            word-break: break-word;
        }

        .h187-hero-subtitle {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.35rem);
            color: var(--h187-text-muted);
            margin-bottom: 40px;
            max-width: 700px;
        }

        .h187-hero-badge {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(243, 128, 32, 0.1);
            color: var(--h187-primary);
            border-radius: 50px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        /* --- Download Grid --- */
        .h187-download-section {
            padding: 64px 0;
            margin-top: -80px;
        }

        .h187-download-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
        }

        .h187-download-card {
            background: var(--h187-white);
            border: 1px solid var(--h187-border);
            border-radius: 16px;
            padding: 32px;
            box-shadow: var(--h187-shadow);
            transition: transform 0.3s ease, border-color 0.3s ease;
            display: flex;
            flex-direction: column;
            min-width: 0;
        }

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

        .h187-card-type {
            font-size: 12px;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--h187-text-muted);
            margin-bottom: 8px;
        }

        .h187-card-title {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .h187-card-desc {
            font-size: 15px;
            color: var(--h187-text-muted);
            margin-bottom: 24px;
            flex-grow: 1;
        }

        .h187-btn-download {
            display: block;
            text-align: center;
            background: var(--h187-primary);
            color: var(--h187-white);
            padding: 14px 24px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 16px;
        }

        .h187-btn-download:hover {
            background: #d86d1a;
            box-shadow: 0 5px 15px rgba(243, 128, 32, 0.3);
        }

        .h187-btn-outline {
            background: transparent;
            border: 1px solid var(--h187-primary);
            color: var(--h187-primary);
        }

        /* --- Comparison Modes Section --- */
        .h187-modes-section {
            padding: 96px 0;
            background: var(--h187-bg-light);
        }

        .h187-section-header {
            text-align: center;
            margin-bottom: 64px;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }

        .h187-section-title {
            font-size: clamp(1.75rem, 3vw, 2.5rem);
            font-weight: 700;
            margin-bottom: 16px;
        }

        .h187-mode-item {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            margin-bottom: 80px;
            align-items: center;
        }

        .h187-mode-item:nth-child(even) {
            flex-direction: row-reverse;
        }

        .h187-mode-visual {
            flex: 1 1 400px;
            min-width: 0;
            background: var(--h187-white);
            border-radius: 20px;
            padding: 24px;
            box-shadow: var(--h187-shadow);
        }

        .h187-diff-ui-mockup {
            background: #fdfdfd;
            border: 1px solid #eee;
            border-radius: 8px;
            overflow: hidden;
        }

        .h187-ui-header {
            height: 30px;
            background: #eee;
            display: flex;
            align-items: center;
            padding-left: 10px;
            gap: 5px;
        }

        .h187-ui-dot { width: 8px; height: 8px; border-radius: 50%; background: #ccc; }

        .h187-ui-content {
            padding: 15px;
            font-family: monospace;
            font-size: 12px;
        }

        .h187-mode-content {
            flex: 1 1 500px;
            min-width: 0;
        }

        .h187-mode-label {
            color: var(--h187-primary);
            font-weight: 700;
            text-transform: uppercase;
            font-size: 14px;
            margin-bottom: 8px;
            display: block;
        }

        .h187-mode-name {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .h187-capability-list {
            margin-top: 24px;
        }

        .h187-capability-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            margin-bottom: 12px;
            font-size: 15px;
        }

        .h187-check-icon {
            flex-shrink: 0;
            width: 20px;
            height: 20px;
            background: #e7f5e9;
            border-radius: 50%;
            position: relative;
        }

        .h187-check-icon::after {
            content: "✓";
            color: #2e7d32;
            font-size: 12px;
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
        }

        .h187-algorithmic-edge {
            margin-top: 24px;
            padding: 16px;
            background: rgba(243, 128, 32, 0.05);
            border-left: 4px solid var(--h187-primary);
            font-style: italic;
            font-size: 14px;
        }

        /* --- Scenarios Section --- */
        .h187-scenarios-section {
            padding: 96px 0;
        }

        .h187-scenario-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
        }

        .h187-scenario-card {
            flex: 1 1 300px;
            min-width: 0;
            padding: 40px;
            background: var(--h187-white);
            border: 1px solid var(--h187-border);
            border-radius: 12px;
        }

        .h187-scenario-icon {
            width: 64px;
            height: 64px;
            background: var(--h187-secondary);
            border-radius: 12px;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--h187-white);
            font-weight: bold;
            font-size: 24px;
        }

        .h187-scenario-title {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        /* --- Footer --- */
        .h187-footer {
            background: var(--h187-secondary);
            color: #bdc3c7;
            padding: 80px 0 40px;
        }

        .h187-footer-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            margin-bottom: 64px;
        }

        .h187-footer-brand {
            flex: 2 1 400px;
            min-width: 0;
        }

        .h187-footer-title {
            color: var(--h187-white);
            font-size: 24px;
            font-weight: 800;
            margin-bottom: 20px;
        }

        .h187-footer-links {
            flex: 1 1 200px;
            min-width: 0;
        }

        .h187-footer-link-title {
            color: var(--h187-white);
            font-weight: 700;
            margin-bottom: 24px;
            text-transform: uppercase;
            font-size: 14px;
            letter-spacing: 1px;
        }

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

        .h187-footer-link-list a:hover {
            color: var(--h187-primary);
            padding-left: 5px;
        }

        .h187-footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 32px;
            text-align: center;
            font-size: 14px;
        }

        /* --- Dynamic Content Section --- */
        .h187-dynamic-news {
            padding: 64px 0;
            background: #fff;
        }

        /* --- Responsiveness --- */
        @media (max-width: 992px) {
            .h187-hero-text {
                padding-right: 0;
                text-align: center;
                margin-bottom: 48px;
            }
            .h187-hero-subtitle {
                margin-left: auto;
                margin-right: auto;
            }
            .h187-nav-list {
                justify-content: center;
                margin-top: 16px;
            }
        }

        @media (max-width: 768px) {
            .h187-mode-item {
                flex-direction: column !important;
            }
            .h187-mode-visual, .h187-mode-content {
                flex: 1 1 100%;
            }
            .h187-download-grid {
                grid-template-columns: 1fr;
            }
        }