:root {
            --i0sbar-primary: #424242;
            --i0sbar-accent: #448aff;
            --i0sbar-bg-light: #fdfdfd;
            --i0sbar-bg-alt: #f5f5f7;
            --i0sbar-text: #2c3e50;
            --i0sbar-text-muted: #6a737d;
            --i0sbar-border: #e1e4e8;
            --i0sbar-white: #ffffff;
            --i0sbar-shadow: 0 10px 30px rgba(0,0,0,0.05);
            --i0sbar-radius: 12px;
            --i0sbar-max-width: 1100px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
            background-color: var(--i0sbar-bg-light);
            color: var(--i0sbar-text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            word-break: keep-all;
            overflow-x: hidden;
        }

        /* Navigation */
        .i0sbar-nav-wrapper {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(15px);
            -webkit-backdrop-filter: blur(15px);
            border-bottom: 1px solid var(--i0sbar-border);
        }

        .i0sbar-nav-container {
            max-width: var(--i0sbar-max-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 0 24px;
            height: 72px;
        }

        .i0sbar-logo {
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .i0sbar-logo img {
            height: 32px;
            width: auto;
        }

        .i0sbar-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 20px;
            min-width: 0;
        }

        .i0sbar-menu li {
            min-width: 0;
        }

        .i0sbar-menu a {
            text-decoration: none;
            color: var(--i0sbar-text);
            font-size: 0.95rem;
            font-weight: 500;
            transition: color 0.3s ease;
            white-space: nowrap;
        }

        .i0sbar-menu a:hover, .i0sbar-menu a.active {
            color: var(--i0sbar-accent);
        }

        /* Hero Section - Unique Card Overlap Layout */
        .i0sbar-hero {
            padding-top: 160px;
            padding-bottom: 96px;
            background: linear-gradient(180deg, #f5f5f7 0%, #ffffff 100%);
            text-align: center;
            position: relative;
        }

        .i0sbar-content-wrapper {
            max-width: var(--i0sbar-max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .i0sbar-hero-title {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            font-weight: 800;
            color: var(--i0sbar-primary);
            margin-bottom: 24px;
            line-height: 1.2;
            word-break: break-word;
        }

        .i0sbar-hero-subtitle {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.35rem);
            color: var(--i0sbar-text-muted);
            max-width: 800px;
            margin: 0 auto 48px auto;
            word-break: break-word;
        }

        /* Download Matrix */
        .i0sbar-download-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 32px;
            margin-top: 64px;
        }

        .i0sbar-download-card {
            background: var(--i0sbar-white);
            border: 1px solid var(--i0sbar-border);
            border-radius: var(--i0sbar-radius);
            padding: 48px 32px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            display: flex;
            flex-direction: column;
            align-items: center;
            min-width: 0;
        }

        .i0sbar-download-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--i0sbar-shadow);
        }

        .i0sbar-os-label {
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: var(--i0sbar-accent);
            font-weight: 700;
            margin-bottom: 16px;
        }

        .i0sbar-os-name {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 32px;
        }

        .i0sbar-btn {
            display: inline-block;
            padding: 14px 32px;
            border-radius: 30px;
            background: var(--i0sbar-primary);
            color: var(--i0sbar-white);
            text-decoration: none;
            font-weight: 600;
            transition: background 0.3s ease, transform 0.2s active;
            border: none;
            cursor: pointer;
            width: 100%;
        }

        .i0sbar-btn:hover {
            background: var(--i0sbar-accent);
        }

        .i0sbar-btn-secondary {
            background: transparent;
            color: var(--i0sbar-primary);
            border: 1px solid var(--i0sbar-border);
            margin-top: 12px;
        }

        .i0sbar-btn-secondary:hover {
            background: var(--i0sbar-bg-alt);
            color: var(--i0sbar-primary);
        }

        /* Workflow Section */
        .i0sbar-workflow {
            padding: 96px 0;
            background: var(--i0sbar-white);
        }

        .i0sbar-section-header {
            text-align: center;
            margin-bottom: 64px;
        }

        .i0sbar-section-title {
            font-size: clamp(1.5rem, 3vw + 0.5rem, 2.5rem);
            font-weight: 700;
            margin-bottom: 16px;
        }

        .i0sbar-persona-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 24px;
        }

        .i0sbar-persona-card {
            background: var(--i0sbar-bg-alt);
            padding: 40px;
            border-radius: var(--i0sbar-radius);
            min-width: 0;
            word-break: break-word;
        }

        .i0sbar-persona-role {
            font-weight: 700;
            font-size: 1.2rem;
            margin-bottom: 16px;
            color: var(--i0sbar-primary);
            display: block;
        }

        .i0sbar-persona-text {
            color: var(--i0sbar-text-muted);
            font-size: 1rem;
        }

        /* Feature Highlight - Split Design */
        .i0sbar-split-section {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
            padding: 96px 0;
            min-width: 0;
        }

        .i0sbar-split-text {
            flex: 1;
            min-width: 300px;
        }

        .i0sbar-split-visual {
            flex: 1;
            min-width: 300px;
            background: linear-gradient(45deg, #eef2f3, #8e9eab);
            height: 400px;
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            color: rgba(255,255,255,0.5);
            font-size: 2rem;
        }

        /* Dynamic Content Section */
        .i0sbar-section[data-dynamic-content="latest-articles"] {
            padding: 96px 0;
            border-top: 1px solid var(--i0sbar-border);
        }

        /* Footer */
        .i0sbar-footer {
            background: var(--i0sbar-bg-alt);
            padding: 80px 0 40px 0;
            border-top: 1px solid var(--i0sbar-border);
        }

        .i0sbar-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
        }

        .i0sbar-footer-brand {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--i0sbar-primary);
            margin-bottom: 24px;
        }

        .i0sbar-footer-links {
            list-style: none;
        }

        .i0sbar-footer-links li {
            margin-bottom: 12px;
        }

        .i0sbar-footer-links a {
            text-decoration: none;
            color: var(--i0sbar-text-muted);
            transition: color 0.3s ease;
        }

        .i0sbar-footer-links a:hover {
            color: var(--i0sbar-accent);
        }

        .i0sbar-copyright {
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid var(--i0sbar-border);
            color: var(--i0sbar-text-muted);
            font-size: 0.9rem;
        }

        /* Mobile Adjustments */
        @media (max-width: 768px) {
            .i0sbar-menu {
                display: none; /* In a real project, add a hamburger menu */
            }
            .i0sbar-nav-container {
                justify-content: center;
            }
            .i0sbar-split-section {
                flex-direction: column;
                text-align: center;
            }
            .i0sbar-download-grid {
                grid-template-columns: 1fr;
            }
        }