:root {
            --bt74-primary: #1a73e8;
            --bt74-accent: #34a853;
            --bt74-warning: #fbbc04;
            --bt74-danger: #ea4335;
            --bt74-text: #202124;
            --bt74-text-light: #5f6368;
            --bt74-bg: #ffffff;
            --bt74-glass: rgba(255, 255, 255, 0.8);
            --bt74-spacing-unit: 8px;
            --bt74-container-width: 1400px;
        }

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

        body {
            font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            color: var(--bt74-text);
            background-color: var(--bt74-bg);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: keep-all;
        }

        /* Typography */
        h1, h2, h3 {
            line-height: 1.2;
            word-break: keep-all;
            white-space: normal;
        }

        p {
            line-height: 1.8;
            word-break: break-word;
            overflow-wrap: break-word;
        }

        .bt74-fluid-h1 { font-size: clamp(2.5rem, 6vw + 1rem, 4.5rem); font-weight: 800; }
        .bt74-fluid-h2 { font-size: clamp(2rem, 4vw + 0.5rem, 3rem); font-weight: 700; }
        .bt74-fluid-body { font-size: clamp(1rem, 1vw + 0.5rem, 1.25rem); }

        /* Navigation */
        .bt74-header {
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            background: var(--bt74-glass);
            backdrop-filter: blur(15px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }

        .bt74-nav-container {
            max-width: var(--bt74-container-width);
            margin: 0 auto;
            padding: 0 32px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            height: 80px;
        }

        .bt74-logo {
            flex: 0 0 auto;
            min-width: 0;
            display: flex;
            align-items: center;
        }

        .bt74-logo img {
            height: 40px;
            width: auto;
        }

        .bt74-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 24px;
            min-width: 0;
        }

        .bt74-menu-item a {
            text-decoration: none;
            color: var(--bt74-text-light);
            font-weight: 500;
            font-size: 15px;
            transition: color 0.3s;
            padding: 8px 0;
            position: relative;
        }

        .bt74-menu-item a:hover,
        .bt74-menu-item.bt74-active a {
            color: var(--bt74-primary);
        }

        .bt74-menu-item.bt74-active a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--bt74-primary);
        }

        /* Hero Section */
        .bt74-hero {
            padding: 160px 32px 96px;
            background: radial-gradient(circle at 80% 20%, rgba(26, 115, 232, 0.05) 0%, transparent 40%);
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            text-align: center;
        }

        .bt74-hero-content {
            max-width: 900px;
            min-width: 0;
        }

        .bt74-hero-badge {
            display: inline-block;
            background: rgba(26, 115, 232, 0.1);
            color: var(--bt74-primary);
            padding: 8px 24px;
            border-radius: 100px;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .bt74-hero-subtitle {
            margin: 32px 0;
            color: var(--bt74-text-light);
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        /* Non-linear Layered Section */
        .bt74-layer-section {
            padding: 96px 0;
            overflow: hidden;
            position: relative;
        }

        .bt74-parallax-container {
            max-width: var(--bt74-container-width);
            margin: 0 auto;
            padding: 0 32px;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 64px;
            align-items: center;
        }

        .bt74-layer-visual {
            position: relative;
            min-height: 500px;
            min-width: 0;
        }

        .bt74-kernel-card {
            position: absolute;
            background: white;
            padding: 32px;
            border-radius: 24px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
            border: 1px solid rgba(0,0,0,0.05);
            transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
        }

        .bt74-card-1 { top: 10%; left: 10%; z-index: 3; width: 80%; }
        .bt74-card-2 { top: 30%; left: 20%; z-index: 2; width: 80%; background: rgba(255,255,255,0.6); backdrop-filter: blur(5px); }
        .bt74-card-3 { top: 50%; left: 30%; z-index: 1; width: 80%; background: rgba(255,255,255,0.3); }

        .bt74-kernel-card:hover {
            transform: translateY(-15px) scale(1.02);
            z-index: 10;
        }

        /* Accelerator Suite Grid */
        .bt74-accelerator {
            background: #f8f9fa;
            padding: 96px 32px;
        }

        .bt74-grid {
            max-width: var(--bt74-container-width);
            margin: 48px auto 0;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
        }

        .bt74-feature-card {
            background: white;
            padding: 48px;
            border-radius: 24px;
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
            min-width: 0;
            border: 1px solid transparent;
        }

        .bt74-feature-card:hover {
            border-color: var(--bt74-primary);
            box-shadow: 0 12px 24px rgba(26, 115, 232, 0.08);
            transform: translateY(-8px);
        }

        .bt74-feature-icon {
            width: 64px;
            height: 64px;
            background: #f1f3f4;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 32px;
            font-size: 24px;
            color: var(--bt74-primary);
        }

        .bt74-feature-tag {
            font-size: 12px;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--bt74-primary);
            font-weight: 700;
            margin-bottom: 16px;
        }

        /* Sync Section - Fluid Layout */
        .bt74-sync-section {
            padding: 120px 32px;
            max-width: var(--bt74-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
        }

        .bt74-sync-info {
            flex: 1 1 500px;
            min-width: 0;
        }

        .bt74-sync-visual {
            flex: 1 1 500px;
            min-width: 0;
            background: linear-gradient(135deg, #1a73e8 0%, #0d47a1 100%);
            border-radius: 40px;
            padding: 64px;
            color: white;
            display: flex;
            flex-direction: column;
            gap: 24px;
            position: relative;
            overflow: hidden;
        }

        .bt74-sync-visual::before {
            content: '';
            position: absolute;
            top: -20%;
            right: -20%;
            width: 300px;
            height: 300px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
        }

        .bt74-device-list {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }

        .bt74-device-tag {
            background: rgba(255,255,255,0.2);
            padding: 8px 20px;
            border-radius: 50px;
            font-size: 14px;
            backdrop-filter: blur(5px);
        }

        /* Footer */
        .bt74-footer {
            padding: 96px 32px 48px;
            border-top: 1px solid #eee;
            background: #fff;
        }

        .bt74-footer-content {
            max-width: var(--bt74-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
        }

        .bt74-footer-brand {
            flex: 1 1 300px;
            min-width: 0;
        }

        .bt74-brand-text {
            font-size: 24px;
            font-weight: 700;
            color: var(--bt74-text);
            margin-bottom: 16px;
        }

        .bt74-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
        }

        .bt74-footer-column {
            min-width: 150px;
        }

        .bt74-footer-column h4 {
            margin-bottom: 24px;
            font-size: 14px;
            color: var(--bt74-text);
        }

        .bt74-footer-column ul {
            list-style: none;
        }

        .bt74-footer-column ul li {
            margin-bottom: 12px;
        }

        .bt74-footer-column ul li a {
            text-decoration: none;
            color: var(--bt74-text-light);
            font-size: 14px;
            transition: color 0.3s;
        }

        .bt74-footer-column ul li a:hover {
            color: var(--bt74-primary);
        }

        .bt74-copyright {
            max-width: var(--bt74-container-width);
            margin: 48px auto 0;
            padding-top: 32px;
            border-top: 1px solid #f1f3f4;
            color: var(--bt74-text-light);
            font-size: 13px;
        }

        /* Button */
        .bt74-btn {
            display: inline-flex;
            align-items: center;
            padding: 16px 32px;
            border-radius: 12px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s;
            cursor: pointer;
            border: none;
            font-size: 16px;
        }

        .bt74-btn-primary {
            background: var(--bt74-primary);
            color: white;
            box-shadow: 0 4px 14px rgba(26, 115, 232, 0.3);
        }

        .bt74-btn-primary:hover {
            background: #1557b0;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(26, 115, 232, 0.4);
        }

        /* Responsive */
        @media (max-width: 768px) {
            .bt74-nav-container { height: auto; padding: 16px; }
            .bt74-menu { width: 100%; order: 3; gap: 12px; margin-top: 16px; justify-content: center; }
            .bt74-menu-item a { font-size: 13px; }
            .bt74-hero { padding: 140px 24px 64px; }
            .bt74-parallax-container, .bt74-sync-section { flex-direction: column; text-align: center; }
            .bt74-layer-visual { min-height: 400px; }
            .bt74-kernel-card { width: 90%; left: 5%; }
            .bt74-footer-content { flex-direction: column; }
        }