:root {
            --f8a5-primary: #FF6600;
            --f8a5-primary-soft: #FFF0E6;
            --f8a5-dark: #222222;
            --f8a5-gray: #666666;
            --f8a5-light-gray: #F5F5F7;
            --f8a5-white: #FFFFFF;
            --f8a5-shadow: 0 10px 30px rgba(0,0,0,0.08);
            --f8a5-radius: 16px;
            --f8a5-grid: 8px;
        }

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--f8a5-dark);
            line-height: 1.6;
            background-color: var(--f8a5-white);
            overflow-x: hidden;
            word-break: keep-all;
        }

        /* Fluid Typography */
        h1 { font-size: clamp(2rem, 5vw + 1rem, 3.5rem); line-height: 1.2; font-weight: 800; margin-bottom: 24px; }
        h2 { font-size: clamp(1.5rem, 3vw + 0.5rem, 2.5rem); line-height: 1.3; font-weight: 700; }
        h3 { font-size: clamp(1.2rem, 2vw + 0.5rem, 1.8rem); line-height: 1.4; }
        p { font-size: clamp(1rem, 1vw + 0.5rem, 1.125rem); line-height: 1.8; color: var(--f8a5-gray); }

        .f8a5-container {
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* Navigation */
        .f8a5-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            z-index: 1000;
            border-bottom: 1px solid rgba(0,0,0,0.05);
        }

        .f8a5-nav-wrapper {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            height: 80px;
            min-width: 0;
        }

        .f8a5-logo {
            flex: 0 0 auto;
            min-width: 0;
        }

        .f8a5-logo img {
            height: 32px;
            display: block;
        }

        .f8a5-nav {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 24px;
            min-width: 0;
        }

        .f8a5-nav li {
            min-width: 0;
        }

        .f8a5-nav a {
            text-decoration: none;
            color: var(--f8a5-dark);
            font-weight: 500;
            font-size: 15px;
            transition: color 0.3s;
            position: relative;
            padding: 8px 0;
        }

        .f8a5-nav a:hover, .f8a5-nav a.f8a5-active {
            color: var(--f8a5-primary);
        }

        .f8a5-nav a.f8a5-active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: var(--f8a5-primary);
            border-radius: 2px;
        }

        /* Hero Section - Unique Diagonal Layout */
        .f8a5-hero {
            padding: 160px 0 96px;
            background: linear-gradient(135deg, var(--f8a5-primary-soft) 0%, #ffffff 100%);
            position: relative;
            overflow: hidden;
        }

        .f8a5-hero-content {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
            min-width: 0;
        }

        .f8a5-hero-text {
            flex: 1 1 500px;
            min-width: 0;
            word-break: break-word;
        }

        .f8a5-hero-visual {
            flex: 1 1 400px;
            min-width: 0;
            position: relative;
        }

        /* Simulated Handwriting Pad via CSS */
        .f8a5-handwriting-pad {
            background: #fff;
            border-radius: 24px;
            box-shadow: var(--f8a5-shadow);
            padding: 32px;
            border: 8px solid #eee;
            aspect-ratio: 4/3;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            position: relative;
        }

        .f8a5-ink-stroke {
            width: 80%;
            height: 2px;
            background: #ddd;
            margin: 12px 0;
            position: relative;
        }

        .f8a5-ink-stroke::after {
            content: '';
            position: absolute;
            top: -20px;
            left: 20%;
            width: 40px;
            height: 40px;
            border-left: 4px solid var(--f8a5-primary);
            border-bottom: 4px solid var(--f8a5-primary);
            transform: rotate(-15deg);
        }

        .f8a5-btn {
            display: inline-block;
            padding: 16px 48px;
            background: var(--f8a5-primary);
            color: white;
            text-decoration: none;
            border-radius: 40px;
            font-weight: 600;
            transition: transform 0.3s, box-shadow 0.3s;
            border: none;
            cursor: pointer;
            box-shadow: 0 4px 15px rgba(255, 102, 0, 0.3);
        }

        .f8a5-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(255, 102, 0, 0.4);
        }

        /* Features Section */
        .f8a5-section {
            padding: 96px 0;
            min-width: 0;
        }

        .f8a5-section-title {
            text-align: center;
            margin-bottom: 64px;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }

        .f8a5-grid-layout {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
            min-width: 0;
        }

        .f8a5-card {
            background: var(--f8a5-white);
            padding: 40px;
            border-radius: var(--f8a5-radius);
            border: 1px solid var(--f8a5-light-gray);
            transition: all 0.3s ease;
            min-width: 0;
            word-break: break-word;
        }

        .f8a5-card:hover {
            border-color: var(--f8a5-primary);
            transform: translateY(-8px);
            box-shadow: var(--f8a5-shadow);
        }

        .f8a5-card-icon {
            width: 64px;
            height: 64px;
            background: var(--f8a5-primary-soft);
            border-radius: 12px;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: var(--f8a5-primary);
            font-weight: bold;
        }

        /* Download Options Section */
        .f8a5-download-row {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            justify-content: center;
            margin-top: 48px;
            min-width: 0;
        }

        .f8a5-dl-item {
            flex: 1 1 240px;
            min-width: 0;
            background: var(--f8a5-light-gray);
            padding: 32px;
            border-radius: 20px;
            text-align: center;
            transition: background 0.3s;
        }

        .f8a5-dl-item:hover {
            background: #eef2f3;
        }

        .f8a5-dl-item h4 {
            margin-bottom: 16px;
            font-size: 1.25rem;
        }

        /* Dynamic Content Section */
        .f8a5-news-section {
            background-color: #fafafa;
        }

        /* Footer */
        .f8a5-footer {
            background: var(--f8a5-dark);
            color: rgba(255,255,255,0.7);
            padding: 80px 0 40px;
        }

        .f8a5-footer-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
            margin-bottom: 64px;
            min-width: 0;
        }

        .f8a5-footer-brand {
            flex: 1 1 300px;
            min-width: 0;
        }

        .f8a5-footer-brand h2 {
            color: var(--f8a5-white);
            margin-bottom: 16px;
        }

        .f8a5-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            min-width: 0;
        }

        .f8a5-footer-group {
            min-width: 120px;
        }

        .f8a5-footer-group h5 {
            color: var(--f8a5-white);
            margin-bottom: 24px;
            font-size: 16px;
        }

        .f8a5-footer-group ul {
            list-style: none;
        }

        .f8a5-footer-group li {
            margin-bottom: 12px;
        }

        .f8a5-footer-group a {
            color: rgba(255,255,255,0.5);
            text-decoration: none;
            transition: color 0.3s;
        }

        .f8a5-footer-group a:hover {
            color: var(--f8a5-primary);
        }

        .f8a5-copyright {
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 14px;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .f8a5-nav-wrapper {
                height: auto;
                padding: 16px 0;
            }
            .f8a5-nav {
                display: none; /* In a real project, add a hamburger menu */
            }
            .f8a5-hero {
                padding: 120px 0 64px;
                text-align: center;
            }
            .f8a5-hero-content {
                flex-direction: column;
            }
            .f8a5-grid-layout {
                grid-template-columns: 1fr;
            }
        }