:root {
            --hdsq1-primary: #1A73E8;
            --hdsq1-secondary: #34A853;
            --hdsq1-tertiary: #FBBC05;
            --hdsq1-accent: #EA4335;
            --hdsq1-text-main: #202124;
            --hdsq1-text-sub: #5F6368;
            --hdsq1-bg-light: #F8F9FA;
            --hdsq1-white: #FFFFFF;
            --hdsq1-glass: rgba(255, 255, 255, 0.85);
            --hdsq1-spacing: 8px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: var(--hdsq1-text-main);
            background-color: var(--hdsq1-bg-light);
            line-height: 1.7;
            overflow-x: hidden;
            word-break: keep-all;
        }

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

        /* Typography */
        h1 { font-size: clamp(2rem, 5vw + 1rem, 4rem); line-height: 1.2; font-weight: 800; letter-spacing: -1px; margin-bottom: 24px; word-break: break-word; }
        h2 { font-size: clamp(1.5rem, 3vw + 0.5rem, 2.5rem); font-weight: 700; margin-bottom: 16px; word-break: break-word; }
        p { font-size: clamp(1rem, 1vw + 0.5rem, 1.125rem); color: var(--hdsq1-text-sub); margin-bottom: 16px; word-break: break-word; overflow-wrap: break-word; }

        /* Layout */
        .hdsq1-container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 48px;
            position: relative;
        }

        @media (max-width: 768px) {
            .hdsq1-container { padding: 0 24px; }
        }

        /* Fluid Background */
        .hdsq1-liquid-bg {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
            overflow: hidden;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
        }

        .hdsq1-blob {
            position: absolute;
            width: 600px;
            height: 600px;
            background: var(--hdsq1-tertiary);
            filter: blur(100px);
            opacity: 0.15;
            border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
            animation: hdsq1-float 20s infinite alternate;
        }

        .hdsq1-blob:nth-child(2) {
            background: var(--hdsq1-primary);
            right: -100px;
            top: 20%;
            width: 500px;
            animation-duration: 25s;
        }

        @keyframes hdsq1-float {
            from { transform: translate(0, 0) rotate(0deg); }
            to { transform: translate(100px, 50px) rotate(30deg); }
        }

        /* Navbar */
        .hdsq1-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            padding: 20px 0;
        }

        .hdsq1-header.hdsq1-scrolled {
            background: var(--hdsq1-glass);
            backdrop-filter: blur(15px);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.05);
            padding: 12px 0;
        }

        .hdsq1-nav-wrapper {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
        }

        .hdsq1-logo {
            flex: 0 0 auto;
            min-width: 0;
        }

        .hdsq1-logo img {
            height: 40px;
            width: auto;
            display: block;
        }

        .hdsq1-nav {
            flex: 1 1 0;
            min-width: 0;
            display: flex;
            flex-wrap: wrap;
            justify-content: flex-end;
        }

        .hdsq1-menu {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
        }

        .hdsq1-menu-item {
            font-size: 14px;
            font-weight: 500;
            color: var(--hdsq1-text-main);
            position: relative;
            padding: 8px 0;
        }

        .hdsq1-menu-item::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--hdsq1-primary);
            transition: width 0.3s;
        }

        .hdsq1-menu-item:hover::after,
        .hdsq1-menu-item.hdsq1-active::after {
            width: 100%;
        }

        .hdsq1-menu-item.hdsq1-active {
            color: var(--hdsq1-primary);
        }

        /* Hero Download Section */
        .hdsq1-hero {
            padding: 180px 0 100px;
            text-align: center;
        }

        .hdsq1-hero-content {
            max-width: 900px;
            margin: 0 auto;
        }

        .hdsq1-badge {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(26, 115, 232, 0.1);
            color: var(--hdsq1-primary);
            border-radius: 100px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .hdsq1-download-hub {
            margin-top: 64px;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 32px;
        }

        .hdsq1-main-btn {
            background: var(--hdsq1-primary);
            color: var(--hdsq1-white);
            padding: 20px 48px;
            border-radius: 16px;
            font-size: 1.25rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 12px;
            box-shadow: 0 10px 25px rgba(26, 115, 232, 0.3);
            position: relative;
            overflow: hidden;
        }

        .hdsq1-main-btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: 0.5s;
        }

        .hdsq1-main-btn:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 35px rgba(26, 115, 232, 0.4);
        }

        .hdsq1-main-btn:hover::before {
            left: 100%;
        }

        .hdsq1-breath-dot {
            width: 12px;
            height: 12px;
            background: #fff;
            border-radius: 50%;
            display: inline-block;
            animation: hdsq1-pulse 2s infinite;
        }

        @keyframes hdsq1-pulse {
            0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.7); }
            70% { transform: scale(1); box-shadow: 0 0 0 10px rgba(255, 255, 255, 0); }
            100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(255, 255, 255, 0); }
        }

        /* Version Grid */
        .hdsq1-versions {
            padding: 64px 0;
        }

        .hdsq1-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
        }

        .hdsq1-card {
            background: var(--hdsq1-white);
            border-radius: 24px;
            padding: 40px;
            border: 1px solid rgba(0,0,0,0.05);
            transition: all 0.4s;
            display: flex;
            flex-direction: column;
            min-width: 0;
        }

        .hdsq1-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
            border-color: var(--hdsq1-primary);
        }

        .hdsq1-card-icon {
            font-size: 48px;
            margin-bottom: 24px;
        }

        .hdsq1-card-title {
            font-size: 1.5rem;
            margin-bottom: 12px;
        }

        .hdsq1-card-list {
            margin-bottom: 32px;
            flex-grow: 1;
        }

        .hdsq1-card-list li {
            font-size: 14px;
            color: var(--hdsq1-text-sub);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .hdsq1-btn-outline {
            border: 2px solid var(--hdsq1-primary);
            color: var(--hdsq1-primary);
            padding: 12px 24px;
            border-radius: 12px;
            text-align: center;
            font-weight: 600;
        }

        .hdsq1-btn-outline:hover {
            background: var(--hdsq1-primary);
            color: var(--hdsq1-white);
        }

        /* Info Section - Asymmetric */
        .hdsq1-info-section {
            padding: 100px 0;
        }

        .hdsq1-flex-row {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
        }

        .hdsq1-info-text {
            flex: 1 1 500px;
            min-width: 0;
        }

        .hdsq1-info-visual {
            flex: 1 1 400px;
            min-width: 0;
            background: var(--hdsq1-white);
            border-radius: 40px;
            padding: 40px;
            box-shadow: 20px 20px 60px rgba(0,0,0,0.05);
            position: relative;
        }

        .hdsq1-stats-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }

        .hdsq1-stat-item {
            padding: 24px;
            background: var(--hdsq1-bg-light);
            border-radius: 20px;
        }

        .hdsq1-stat-val {
            font-size: 2rem;
            font-weight: 800;
            color: var(--hdsq1-primary);
            display: block;
        }

        /* FAQ Dynamic Content */
        .hdsq1-faq {
            background: var(--hdsq1-white);
            padding: 100px 0;
            border-radius: 64px 64px 0 0;
        }

        /* Footer */
        .hdsq1-footer {
            background: #202124;
            color: #fff;
            padding: 80px 0 40px;
        }

        .hdsq1-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
        }

        .hdsq1-footer-brand h3 {
            font-size: 24px;
            margin-bottom: 16px;
            color: var(--hdsq1-white);
        }

        .hdsq1-footer-link-title {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 24px;
            color: #9AA0A6;
        }

        .hdsq1-footer-menu li {
            margin-bottom: 12px;
        }

        .hdsq1-footer-menu a {
            color: #BDC1C6;
            font-size: 14px;
        }

        .hdsq1-footer-menu a:hover {
            color: var(--hdsq1-white);
        }

        .hdsq1-footer-bottom {
            padding-top: 40px;
            border-top: 1px solid rgba(255,255,255,0.1);
            text-align: center;
            color: #80868B;
            font-size: 13px;
        }

        /* Mobile Adjustments */
        @media (max-width: 992px) {
            .hdsq1-nav {
                display: none; /* Simplification for demo */
            }
            .hdsq1-info-visual {
                order: -1;
            }
        }