:root {
            --kuarrz-primary: #ff6600;
            --kuarrz-primary-light: #ff8533;
            --kuarrz-dark: #1d1d1f;
            --kuarrz-gray: #86868b;
            --kuarrz-light: #f5f5f7;
            --kuarrz-white: #ffffff;
            --kuarrz-glass: rgba(255, 255, 255, 0.8);
            --kuarrz-shadow: 0 10px 30px rgba(0,0,0,0.08);
            --kuarrz-radius: 20px;
            --kuarrz-max-width: 1300px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--kuarrz-white);
            color: var(--kuarrz-dark);
            line-height: 1.6;
            word-break: keep-all;
            overflow-x: hidden;
        }

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

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

        .kuarrz-flex > * {
            min-width: 0;
        }

        /* Typography */
        h1, h2, h3 {
            line-height: 1.2;
            font-weight: 700;
            word-break: keep-all;
            overflow-wrap: break-word;
        }

        p {
            word-break: break-word;
            overflow-wrap: break-word;
            line-height: 1.8;
            color: var(--kuarrz-gray);
        }

        /* Navigation */
        .kuarrz-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: var(--kuarrz-glass);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }

        .kuarrz-nav-container {
            height: 64px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .kuarrz-logo {
            flex-shrink: 0;
        }

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

        .kuarrz-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 24px;
        }

        .kuarrz-menu-link {
            text-decoration: none;
            color: var(--kuarrz-dark);
            font-size: 14px;
            font-weight: 500;
            transition: color 0.3s;
            position: relative;
            padding: 8px 0;
        }

        .kuarrz-menu-link:hover {
            color: var(--kuarrz-primary);
        }

        .kuarrz-menu-link.kuarrz-active {
            color: var(--kuarrz-primary);
        }

        .kuarrz-menu-link.kuarrz-active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--kuarrz-primary);
            border-radius: 2px;
        }

        /* Hero Section */
        .kuarrz-hero {
            padding-top: 160px;
            padding-bottom: 96px;
            background: radial-gradient(circle at 90% 10%, rgba(255, 102, 0, 0.05) 0%, rgba(255, 255, 255, 0) 40%);
            overflow: hidden;
        }

        .kuarrz-hero-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
            gap: 64px;
            align-items: center;
        }

        .kuarrz-hero-content {
            z-index: 2;
        }

        .kuarrz-badge {
            display: inline-block;
            background: rgba(255, 102, 0, 0.1);
            color: var(--kuarrz-primary);
            padding: 6px 16px;
            border-radius: 100px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .kuarrz-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4rem);
            margin-bottom: 24px;
            color: var(--kuarrz-dark);
            letter-spacing: -0.02em;
        }

        .kuarrz-hero-subtitle {
            font-size: clamp(1.1rem, 1vw + 0.5rem, 1.3rem);
            margin-bottom: 48px;
            max-width: 540px;
        }

        .kuarrz-btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }

        .kuarrz-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 16px 36px;
            border-radius: 100px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            font-size: 16px;
        }

        .kuarrz-btn-primary {
            background: var(--kuarrz-primary);
            color: var(--kuarrz-white);
            box-shadow: 0 10px 20px rgba(255, 102, 0, 0.2);
        }

        .kuarrz-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 30px rgba(255, 102, 0, 0.3);
            background: var(--kuarrz-primary-light);
        }

        .kuarrz-hero-visual {
            position: relative;
            display: flex;
            justify-content: center;
        }

        /* Simulated Phone for Visual Impact */
        .kuarrz-phone-mockup {
            width: 300px;
            height: 600px;
            background: #000;
            border-radius: 40px;
            border: 8px solid #333;
            position: relative;
            box-shadow: 0 50px 100px rgba(0,0,0,0.2);
            overflow: hidden;
        }

        .kuarrz-phone-screen {
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, #ff6600 0%, #ffcc00 100%);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 20px;
            color: white;
            text-align: center;
        }

        .kuarrz-keyboard-preview {
            position: absolute;
            bottom: 0;
            width: 100%;
            height: 40%;
            background: rgba(255,255,255,0.9);
            backdrop-filter: blur(10px);
            border-top-left-radius: 20px;
            border-top-right-radius: 20px;
            padding: 10px;
            display: grid;
            grid-template-columns: repeat(10, 1fr);
            gap: 4px;
        }

        .kuarrz-key {
            background: white;
            height: 30px;
            border-radius: 4px;
            box-shadow: 0 1px 2px rgba(0,0,0,0.1);
        }

        /* Features Grid */
        .kuarrz-section {
            padding: 96px 0;
        }

        .kuarrz-section-header {
            text-align: center;
            margin-bottom: 64px;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        .kuarrz-section-title {
            font-size: clamp(2rem, 3vw + 0.5rem, 2.8rem);
            margin-bottom: 16px;
        }

        .kuarrz-features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
        }

        .kuarrz-feature-card {
            background: var(--kuarrz-light);
            padding: 48px;
            border-radius: var(--kuarrz-radius);
            transition: all 0.4s ease;
            border: 1px solid transparent;
        }

        .kuarrz-feature-card:hover {
            background: var(--kuarrz-white);
            border-color: rgba(255, 102, 0, 0.2);
            transform: translateY(-10px);
            box-shadow: var(--kuarrz-shadow);
        }

        .kuarrz-feature-icon {
            font-size: 40px;
            margin-bottom: 24px;
            display: block;
        }

        .kuarrz-feature-name {
            font-size: 20px;
            margin-bottom: 16px;
            color: var(--kuarrz-dark);
        }

        /* Showcase Section - Asymmetrical */
        .kuarrz-showcase {
            background-color: var(--kuarrz-dark);
            color: var(--kuarrz-white);
            border-radius: 40px;
            margin: 0 24px;
            padding: 96px 48px;
        }

        .kuarrz-showcase-flex {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
        }

        .kuarrz-showcase-text {
            flex: 1;
            min-width: 300px;
        }

        .kuarrz-showcase-title {
            color: var(--kuarrz-white);
            font-size: clamp(1.8rem, 2.5vw + 0.5rem, 2.5rem);
            margin-bottom: 24px;
        }

        .kuarrz-showcase-desc {
            color: #a1a1a6;
            margin-bottom: 32px;
        }

        .kuarrz-list {
            list-style: none;
        }

        .kuarrz-list-item {
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .kuarrz-dot {
            width: 8px;
            height: 8px;
            background: var(--kuarrz-primary);
            border-radius: 50%;
        }

        /* Stats Section */
        .kuarrz-stats {
            padding: 64px 0;
            text-align: center;
            border-bottom: 1px solid var(--kuarrz-light);
        }

        .kuarrz-stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 32px;
        }

        .kuarrz-stat-item b {
            display: block;
            font-size: 40px;
            color: var(--kuarrz-primary);
            margin-bottom: 8px;
        }

        /* Footer */
        .kuarrz-footer {
            padding: 96px 0 48px;
            background: var(--kuarrz-white);
        }

        .kuarrz-footer-top {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 64px;
            margin-bottom: 64px;
        }

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

        .kuarrz-footer-links h4 {
            margin-bottom: 24px;
            font-size: 16px;
        }

        .kuarrz-footer-links ul {
            list-style: none;
        }

        .kuarrz-footer-links li {
            margin-bottom: 12px;
        }

        .kuarrz-footer-links a {
            color: var(--kuarrz-gray);
            text-decoration: none;
            transition: color 0.3s;
            font-size: 14px;
        }

        .kuarrz-footer-links a:hover {
            color: var(--kuarrz-primary);
        }

        .kuarrz-footer-bottom {
            padding-top: 32px;
            border-top: 1px solid var(--kuarrz-light);
            text-align: center;
            font-size: 14px;
            color: var(--kuarrz-gray);
        }

        /* Responsive */
        @media (max-width: 992px) {
            .kuarrz-footer-top {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .kuarrz-container {
                padding: 0 24px;
            }
            .kuarrz-nav-container {
                flex-direction: column;
                height: auto;
                padding: 16px 0;
            }
            .kuarrz-menu {
                margin-top: 16px;
                justify-content: center;
                gap: 12px;
            }
            .kuarrz-hero {
                padding-top: 120px;
                text-align: center;
            }
            .kuarrz-hero-subtitle {
                margin-left: auto;
                margin-right: auto;
            }
            .kuarrz-btn-group {
                justify-content: center;
            }
            .kuarrz-hero-visual {
                margin-top: 48px;
            }
            .kuarrz-showcase {
                margin: 0;
                border-radius: 0;
            }
            .kuarrz-footer-top {
                grid-template-columns: 1fr;
                gap: 32px;
                text-align: center;
            }
        }