:root {
            --umkciz-primary: #ff6600;
            --umkciz-secondary: #ff9500;
            --umkciz-dark: #1d1d1f;
            --umkciz-light: #f5f5f7;
            --umkciz-white: #ffffff;
            --umkciz-glass: rgba(255, 255, 255, 0.8);
            --umkciz-spacing-unit: 8px;
            --umkciz-container-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(--umkciz-light);
            color: var(--umkciz-dark);
            line-height: 1.6;
            overflow-x: hidden;
        }

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

        /* Fluid Typography */
        h1 { font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem); line-height: 1.1; font-weight: 800; letter-spacing: -0.02em; }
        h2 { font-size: clamp(1.8rem, 3vw + 0.5rem, 2.8rem); font-weight: 700; }
        p { font-size: clamp(1rem, 2vw + 0.5rem, 1.15rem); line-height: 1.8; color: #424245; }

        .umkciz-container {
            max-width: var(--umkciz-container-width);
            margin: 0 auto;
            padding: 0 32px;
            width: 100%;
        }

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

        .umkciz-nav-wrapper {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            height: 72px;
            min-width: 0;
        }

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

        .umkciz-logo img {
            height: 32px;
            width: auto;
            display: block;
        }

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

        .umkciz-menu-item {
            min-width: 0;
        }

        .umkciz-menu-link {
            font-weight: 500;
            font-size: 15px;
            color: #1d1d1f;
            padding: 8px 0;
            position: relative;
        }

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

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

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

        /* Hero Section - Unique Split Layout */
        .umkciz-hero {
            padding: 160px 0 96px;
            background: linear-gradient(160deg, #fff 40%, #fff5f0 100%);
            overflow: hidden;
        }

        .umkciz-hero-content {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
            min-width: 0;
        }

        .umkciz-hero-text {
            flex: 1 1 500px;
            min-width: 0;
            word-break: break-word;
        }

        .umkciz-hero-badge {
            display: inline-block;
            background: rgba(255, 102, 0, 0.1);
            color: var(--umkciz-primary);
            padding: 6px 16px;
            border-radius: 20px;
            font-weight: 600;
            margin-bottom: 24px;
            font-size: 14px;
        }

        .umkciz-hero-visual {
            flex: 1 1 400px;
            min-width: 0;
            position: relative;
        }

        /* CSS-based skin preview visual */
        .umkciz-skin-mockup {
            width: 100%;
            max-width: 500px;
            height: 320px;
            background: var(--umkciz-white);
            border-radius: 24px;
            box-shadow: 0 40px 80px rgba(0,0,0,0.1);
            padding: 24px;
            border: 8px solid #333;
            position: relative;
            transform: perspective(1000px) rotateY(-10deg) rotateX(5deg);
        }

        .umkciz-keyboard-grid {
            display: grid;
            grid-template-columns: repeat(10, 1fr);
            gap: 8px;
            height: 100%;
        }

        .umkciz-key {
            background: #f0f0f2;
            border-radius: 6px;
            aspect-ratio: 1;
            box-shadow: 0 2px 0 #ccc;
        }

        .umkciz-key-accent {
            background: var(--umkciz-primary);
        }

        /* Skin Gallery Section */
        .umkciz-section {
            padding: 96px 0;
            min-width: 0;
        }

        .umkciz-section-header {
            margin-bottom: 48px;
            text-align: center;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }

        .umkciz-filter-bar {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
            margin-bottom: 48px;
            min-width: 0;
        }

        .umkciz-filter-btn {
            padding: 10px 24px;
            background: var(--umkciz-white);
            border: 1px solid #e0e0e0;
            border-radius: 30px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s;
        }

        .umkciz-filter-btn:hover, .umkciz-filter-btn.active {
            background: var(--umkciz-primary);
            color: white;
            border-color: var(--umkciz-primary);
            box-shadow: 0 8px 16px rgba(255,102,0,0.2);
        }

        .umkciz-skin-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 32px;
            min-width: 0;
        }

        .umkciz-skin-card {
            background: var(--umkciz-white);
            border-radius: 20px;
            overflow: hidden;
            transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
            border: 1px solid rgba(0,0,0,0.03);
            position: relative;
            min-width: 0;
        }

        .umkciz-skin-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 30px 60px rgba(0,0,0,0.08);
        }

        .umkciz-skin-preview {
            width: 100%;
            height: 200px;
            background: #eee;
            background-image: linear-gradient(45deg, #f0f0f0 25%, transparent 25%, transparent 75%, #f0f0f0 75%, #f0f0f0), 
                              linear-gradient(45deg, #f0f0f0 25%, transparent 25%, transparent 75%, #f0f0f0 75%, #f0f0f0);
            background-size: 20px 20px;
            background-position: 0 0, 10px 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: #ccc;
            position: relative;
        }

        .umkciz-skin-info {
            padding: 24px;
            word-break: break-word;
        }

        .umkciz-skin-title {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .umkciz-skin-meta {
            display: flex;
            justify-content: space-between;
            color: #86868b;
            font-size: 14px;
        }

        .umkciz-download-btn {
            display: inline-block;
            margin-top: 16px;
            padding: 12px 24px;
            background: var(--umkciz-dark);
            color: white;
            border-radius: 12px;
            font-weight: 600;
            width: 100%;
            text-align: center;
        }

        .umkciz-download-btn:hover {
            background: var(--umkciz-primary);
        }

        /* Features Section */
        .umkciz-feature-alt {
            background: var(--umkciz-dark);
            color: var(--umkciz-white);
            border-radius: 48px;
            margin: 48px 24px;
            padding: 96px 48px;
        }

        .umkciz-feature-alt p {
            color: #a1a1a6;
        }

        .umkciz-grid-2col {
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
            align-items: center;
            min-width: 0;
        }

        .umkciz-feature-box {
            flex: 1 1 400px;
            min-width: 0;
        }

        /* Footer */
        .umkciz-footer {
            background: #fbfbfd;
            padding: 80px 0 40px;
            border-top: 1px solid #d2d2d7;
            min-width: 0;
        }

        .umkciz-footer-content {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            margin-bottom: 64px;
            min-width: 0;
        }

        .umkciz-footer-brand {
            flex: 1 1 300px;
            min-width: 0;
        }

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

        .umkciz-footer-links {
            flex: 2 1 600px;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 32px;
            min-width: 0;
        }

        .umkciz-footer-column h4 {
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 20px;
            color: #1d1d1f;
        }

        .umkciz-footer-column ul {
            list-style: none;
        }

        .umkciz-footer-column ul li {
            margin-bottom: 12px;
        }

        .umkciz-footer-column a {
            font-size: 14px;
            color: #6e6e73;
        }

        .umkciz-footer-column a:hover {
            color: var(--umkciz-primary);
            text-decoration: underline;
        }

        .umkciz-footer-bottom {
            padding-top: 32px;
            border-top: 1px solid #d2d2d7;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 24px;
            color: #86868b;
            font-size: 12px;
            min-width: 0;
        }

        /* Responsive Breakpoints */
        @media (max-width: 1024px) {
            .umkciz-hero-content { gap: 32px; }
            .umkciz-hero-visual { transform: none; }
            .umkciz-skin-mockup { transform: none; }
        }

        @media (max-width: 768px) {
            .umkciz-menu { display: none; } /* Mobile menu logic would go here */
            .umkciz-container { padding: 0 20px; }
            .umkciz-grid-2col { flex-direction: column; }
            .umkciz-hero { padding: 120px 0 64px; text-align: center; }
            .umkciz-hero-content { flex-direction: column; }
            .umkciz-hero-text { flex: 1 1 auto; }
            .umkciz-feature-alt { border-radius: 0; margin: 24px 0; padding: 64px 24px; }
        }

        /* Animation enhancement */
        .umkciz-btn-glow {
            position: relative;
            overflow: hidden;
            transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
        }

        .umkciz-btn-glow:hover {
            transform: scale(1.05);
            box-shadow: 0 0 20px rgba(255, 102, 0, 0.4);
        }