:root {
            --hdsq1-primary: #1A73E8;
            --hdsq1-red: #EA4335;
            --hdsq1-yellow: #FBBC05;
            --hdsq1-green: #34A853;
            --hdsq1-text: #202124;
            --hdsq1-text-light: #5F6368;
            --hdsq1-bg: #FFFFFF;
            --hdsq1-bg-alt: #F8F9FA;
            --hdsq1-card-shadow: 0 4px 20px rgba(0,0,0,0.08);
            --hdsq1-container-width: 1400px;
        }

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
            color: var(--hdsq1-text);
            background-color: var(--hdsq1-bg);
            line-height: 1.8;
            overflow-x: hidden;
        }

        /* Layout Helpers */
        .hdsq1-flex { display: flex; flex-wrap: wrap; }
        .hdsq1-grid { display: grid; }
        .hdsq1-container {
            max-width: var(--hdsq1-container-width);
            margin: 0 auto;
            padding: 0 48px;
            width: 100%;
        }

        /* Navigation */
        .hdsq1-navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 72px;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(12px);
            z-index: 1000;
            border-bottom: 1px solid rgba(0,0,0,0.05);
            display: flex;
            align-items: center;
        }

        .hdsq1-nav-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
            flex-wrap: nowrap;
        }

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

        .hdsq1-logo img {
            height: 32px;
            display: block;
        }

        .hdsq1-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 24px;
            min-width: 0;
        }

        .hdsq1-menu a {
            text-decoration: none;
            color: var(--hdsq1-text-light);
            font-size: 15px;
            font-weight: 500;
            transition: color 0.3s ease;
            white-space: nowrap;
        }

        .hdsq1-menu a:hover, .hdsq1-menu a.hdsq1-active {
            color: var(--hdsq1-primary);
        }

        /* Hero Section - Asymmetric Design */
        .hdsq1-hero {
            padding: 160px 0 100px;
            background: radial-gradient(circle at 90% 10%, rgba(26, 115, 232, 0.05) 0%, transparent 40%),
                        radial-gradient(circle at 10% 90%, rgba(52, 168, 83, 0.05) 0%, transparent 40%);
            position: relative;
        }

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

        .hdsq1-hero-text {
            flex: 1;
            min-width: 320px;
            word-break: break-word;
        }

        .hdsq1-hero-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-hero-title {
            font-size: clamp(2.5rem, 5vw, 4rem);
            line-height: 1.1;
            font-weight: 800;
            margin-bottom: 24px;
            color: var(--hdsq1-text);
            letter-spacing: -1px;
        }

        .hdsq1-hero-subtitle {
            font-size: clamp(1.1rem, 2vw, 1.4rem);
            color: var(--hdsq1-text-light);
            max-width: 600px;
            margin-bottom: 40px;
        }

        .hdsq1-hero-visual {
            flex: 1;
            min-width: 320px;
            position: relative;
            display: flex;
            justify-content: center;
        }

        /* Abstract Keyboard Visual */
        .hdsq1-key-matrix {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
            padding: 32px;
            background: var(--hdsq1-bg);
            border-radius: 24px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.1);
            transform: perspective(1000px) rotateY(-15deg) rotateX(10deg);
        }

        .hdsq1-key-unit {
            width: 60px;
            height: 60px;
            background: #f1f3f4;
            border-radius: 12px;
            border-bottom: 4px solid #dadce0;
        }

        .hdsq1-key-unit.hdsq1-accent {
            background: var(--hdsq1-primary);
            border-bottom-color: #1669d6;
        }

        /* Shortcut Grid Section */
        .hdsq1-section {
            padding: 100px 0;
        }

        .hdsq1-section-header {
            margin-bottom: 64px;
            max-width: 800px;
        }

        .hdsq1-section-title {
            font-size: clamp(1.8rem, 3vw, 2.5rem);
            margin-bottom: 16px;
            font-weight: 700;
        }

        .hdsq1-grid-shortcuts {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 32px;
        }

        .hdsq1-card {
            background: var(--hdsq1-bg);
            border: 1px solid rgba(0,0,0,0.05);
            padding: 32px;
            border-radius: 20px;
            transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
            display: flex;
            flex-direction: column;
            min-width: 0;
        }

        .hdsq1-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--hdsq1-card-shadow);
            border-color: var(--hdsq1-primary);
        }

        .hdsq1-card-icon {
            width: 48px;
            height: 48px;
            background: var(--hdsq1-bg-alt);
            border-radius: 12px;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            color: var(--hdsq1-primary);
        }

        .hdsq1-card-title {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .hdsq1-shortcut-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 12px 0;
            border-bottom: 1px solid #f1f3f4;
        }

        .hdsq1-shortcut-item:last-child {
            border-bottom: none;
        }

        .hdsq1-shortcut-label {
            color: var(--hdsq1-text-light);
            font-size: 14px;
            margin-right: 16px;
            word-break: keep-all;
        }

        .hdsq1-kbd-group {
            display: flex;
            gap: 4px;
            flex-shrink: 0;
        }

        kbd {
            background-color: #f1f3f4;
            border-radius: 4px;
            border: 1px solid #dadce0;
            box-shadow: 0 1px 1px rgba(0,0,0,0.1);
            color: #3c4043;
            display: inline-block;
            font-family: inherit;
            font-size: 12px;
            font-weight: 700;
            line-height: 1;
            padding: 4px 6px;
            white-space: nowrap;
        }

        /* Power User Section */
        .hdsq1-power-section {
            background: var(--hdsq1-text);
            color: #fff;
            padding: 100px 0;
            border-radius: 40px;
            margin: 0 24px;
        }

        .hdsq1-power-content {
            display: flex;
            flex-wrap: wrap;
            gap: 60px;
            align-items: center;
        }

        .hdsq1-power-text {
            flex: 1;
            min-width: 300px;
        }

        .hdsq1-power-text h2 {
            font-size: clamp(2rem, 4vw, 3rem);
            margin-bottom: 24px;
        }

        .hdsq1-power-list {
            flex: 1;
            min-width: 300px;
            display: grid;
            gap: 20px;
        }

        .hdsq1-power-item {
            background: rgba(255,255,255,0.05);
            padding: 24px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            gap: 20px;
            border: 1px solid rgba(255,255,255,0.1);
        }

        /* Footer */
        .hdsq1-footer {
            background: var(--hdsq1-bg-alt);
            padding: 80px 0 40px;
            margin-top: 100px;
        }

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

        .hdsq1-footer-brand {
            font-size: 24px;
            font-weight: 800;
            color: var(--hdsq1-primary);
            margin-bottom: 16px;
        }

        .hdsq1-footer-link-group h4 {
            font-size: 16px;
            margin-bottom: 24px;
            color: var(--hdsq1-text);
        }

        .hdsq1-footer-link-group ul {
            list-style: none;
        }

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

        .hdsq1-footer-link-group a {
            color: var(--hdsq1-text-light);
            text-decoration: none;
            transition: color 0.3s;
        }

        .hdsq1-footer-link-group a:hover {
            color: var(--hdsq1-primary);
        }

        .hdsq1-copyright {
            padding-top: 40px;
            border-top: 1px solid rgba(0,0,0,0.05);
            text-align: center;
            color: var(--hdsq1-text-light);
            font-size: 14px;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .hdsq1-container { padding: 0 32px; }
        }

        @media (max-width: 768px) {
            .hdsq1-navbar { height: auto; padding: 16px 0; }
            .hdsq1-nav-content { flex-direction: column; gap: 16px; }
            .hdsq1-menu { justify-content: center; gap: 12px; }
            .hdsq1-hero { padding: 120px 0 60px; }
            .hdsq1-hero-visual { display: none; }
            .hdsq1-grid-shortcuts { grid-template-columns: 1fr; }
            .hdsq1-power-section { margin: 0; border-radius: 0; }
        }