:root {
            --i0sbar-primary: #42b983;
            --i0sbar-dark: #2c3e50;
            --i0sbar-light: #f8f9fa;
            --i0sbar-text: #34495e;
            --i0sbar-border: #e9ecef;
            --i0sbar-accent: #3a8ee6;
            --i0sbar-white: #ffffff;
            --i0sbar-shadow: 0 10px 30px rgba(0,0,0,0.05);
            --i0sbar-radius: 12px;
        }

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

        body {
            font-family: "Inter", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--i0sbar-text);
            background-color: var(--i0sbar-white);
            line-height: 1.7;
            overflow-x: hidden;
            word-break: keep-all;
        }

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

        /* Layout System */
        .i0sbar-container {
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .i0sbar-section {
            padding: 96px 0;
            word-break: break-word;
            overflow-wrap: break-word;
        }

        /* Header & Nav */
        .i0sbar-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--i0sbar-border);
        }

        .i0sbar-nav {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            height: 72px;
            min-width: 0;
        }

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

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

        .i0sbar-menu {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            list-style: none;
            min-width: 0;
        }

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

        .i0sbar-menu a {
            font-size: 14px;
            font-weight: 500;
            color: var(--i0sbar-dark);
            padding: 8px 4px;
            position: relative;
        }

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

        .i0sbar-menu a.i0sbar-active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--i0sbar-primary);
        }

        /* Hero Section - Unique Card Stack Style */
        .i0sbar-hero {
            background: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
            padding-top: 160px;
            padding-bottom: 80px;
            text-align: center;
        }

        .i0sbar-hero-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .i0sbar-hero h1 {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            font-weight: 800;
            color: var(--i0sbar-dark);
            line-height: 1.2;
            margin-bottom: 24px;
        }

        .i0sbar-hero p {
            font-size: clamp(1rem, 1.2vw + 0.5rem, 1.25rem);
            color: var(--i0sbar-text);
            margin-bottom: 48px;
            opacity: 0.9;
        }

        /* Download Options Grid */
        .i0sbar-download-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
            margin-top: -60px;
            position: relative;
            z-index: 10;
        }

        .i0sbar-download-card {
            background: var(--i0sbar-white);
            border-radius: var(--i0sbar-radius);
            padding: 40px;
            text-align: left;
            box-shadow: var(--i0sbar-shadow);
            border: 1px solid var(--i0sbar-border);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            min-width: 0;
        }

        .i0sbar-download-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
        }

        .i0sbar-platform-icon {
            width: 48px;
            height: 48px;
            background: var(--i0sbar-light);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 24px;
            font-size: 24px;
            font-weight: bold;
            color: var(--i0sbar-primary);
        }

        .i0sbar-download-card h3 {
            font-size: 24px;
            margin-bottom: 16px;
            color: var(--i0sbar-dark);
        }

        .i0sbar-download-card ul {
            list-style: none;
            margin-bottom: 32px;
        }

        .i0sbar-download-card li {
            font-size: 14px;
            color: var(--i0sbar-text);
            margin-bottom: 8px;
            padding-left: 20px;
            position: relative;
        }

        .i0sbar-download-card li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--i0sbar-primary);
        }

        .i0sbar-btn {
            display: inline-block;
            padding: 14px 28px;
            background: var(--i0sbar-primary);
            color: white;
            border-radius: 8px;
            font-weight: 600;
            text-align: center;
            width: 100%;
            transition: all 0.3s ease;
        }

        .i0sbar-btn:hover {
            background: #36a372;
            transform: scale(1.02);
        }

        .i0sbar-btn-secondary {
            background: var(--i0sbar-dark);
        }

        .i0sbar-btn-secondary:hover {
            background: #1a252f;
        }

        /* Scenarios Section */
        .i0sbar-scenarios {
            background-color: var(--i0sbar-white);
        }

        .i0sbar-scenario-item {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
            margin-bottom: 80px;
        }

        .i0sbar-scenario-item:nth-child(even) {
            flex-direction: row-reverse;
        }

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

        .i0sbar-scenario-visual {
            flex: 1;
            min-width: 300px;
            background: var(--i0sbar-light);
            border-radius: var(--i0sbar-radius);
            padding: 40px;
            border: 1px dashed var(--i0sbar-border);
            text-align: center;
        }

        .i0sbar-scenario-visual .i0sbar-mock-ui {
            background: white;
            border-radius: 8px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.05);
            padding: 20px;
            text-align: left;
        }

        .i0sbar-persona-tag {
            display: inline-block;
            padding: 4px 12px;
            background: #e8f5e9;
            color: var(--i0sbar-primary);
            border-radius: 20px;
            font-size: 12px;
            font-weight: bold;
            margin-bottom: 16px;
            text-transform: uppercase;
        }

        .i0sbar-scenario-text h2 {
            font-size: 32px;
            margin-bottom: 24px;
            color: var(--i0sbar-dark);
        }

        /* Footer */
        .i0sbar-footer {
            background: var(--i0sbar-dark);
            color: rgba(255,255,255,0.8);
            padding: 80px 0 40px;
        }

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

        .i0sbar-footer-brand h2 {
            color: white;
            font-size: 24px;
            margin-bottom: 24px;
        }

        .i0sbar-footer-links h4 {
            color: white;
            margin-bottom: 24px;
            font-size: 16px;
        }

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

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

        .i0sbar-footer-links a:hover {
            color: var(--i0sbar-primary);
            padding-left: 4px;
        }

        .i0sbar-copyright {
            padding-top: 40px;
            border-top: 1px solid rgba(255,255,255,0.1);
            text-align: center;
            font-size: 14px;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .i0sbar-nav {
                height: auto;
                padding: 16px 0;
                flex-direction: column;
                gap: 16px;
            }
            .i0sbar-menu {
                justify-content: center;
                gap: 8px 12px;
            }
            .i0sbar-hero {
                padding-top: 120px;
            }
            .i0sbar-section {
                padding: 64px 0;
            }
            .i0sbar-scenario-item, .i0sbar-scenario-item:nth-child(even) {
                flex-direction: column;
            }
        }