:root {
            --f8a5-primary: #ee1c25;
            --f8a5-primary-dark: #c4161d;
            --f8a5-secondary: #252b3a;
            --f8a5-text: #333333;
            --f8a5-text-light: #666666;
            --f8a5-bg-subtle: #f8f9fa;
            --f8a5-white: #ffffff;
            --f8a5-radius: 16px;
            --f8a5-container-width: 1300px;
            --f8a5-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--f8a5-text);
            line-height: 1.8;
            overflow-x: hidden;
            background-color: var(--f8a5-white);
            word-break: break-word;
        }

        /* Typography */
        h1, h2, h3 {
            line-height: 1.3;
            word-break: keep-all;
            white-space: normal;
        }

        .f8a5-fluid-h1 { font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem); font-weight: 800; }
        .f8a5-fluid-h2 { font-size: clamp(1.8rem, 3vw + 0.5rem, 2.8rem); font-weight: 700; }
        .f8a5-fluid-p { font-size: clamp(1rem, 0.5vw + 0.8rem, 1.25rem); }

        /* Navigation */
        .f8a5-header {
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: var(--f8a5-transition);
        }

        .f8a5-nav-container {
            max-width: var(--f8a5-container-width);
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            height: 80px;
        }

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

        .f8a5-logo img {
            height: 36px;
            display: block;
        }

        .f8a5-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 8px;
            min-width: 0;
        }

        .f8a5-nav-link {
            text-decoration: none;
            color: var(--f8a5-text);
            padding: 8px 16px;
            border-radius: 8px;
            font-weight: 500;
            font-size: 15px;
            transition: var(--f8a5-transition);
        }

        .f8a5-nav-link:hover {
            color: var(--f8a5-primary);
            background: rgba(238, 28, 37, 0.05);
        }

        .f8a5-nav-link.f8a5-active {
            color: var(--f8a5-primary);
            background: rgba(238, 28, 37, 0.08);
        }

        /* Hero Section - Unique Diagonal Layout */
        .f8a5-hero {
            padding: 160px 24px 96px;
            background: linear-gradient(135deg, #fff 0%, #fff5f5 100%);
            position: relative;
            overflow: hidden;
        }

        .f8a5-hero-inner {
            max-width: var(--f8a5-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
        }

        .f8a5-hero-content {
            flex: 1;
            min-width: 320px;
        }

        .f8a5-hero-badge {
            display: inline-block;
            background: rgba(238, 28, 37, 0.1);
            color: var(--f8a5-primary);
            padding: 6px 16px;
            border-radius: 30px;
            font-weight: 600;
            margin-bottom: 24px;
            font-size: 14px;
        }

        .f8a5-hero-title {
            color: var(--f8a5-secondary);
            margin-bottom: 24px;
        }

        .f8a5-hero-subtitle {
            color: var(--f8a5-text-light);
            margin-bottom: 48px;
            max-width: 600px;
        }

        /* Download Options Card */
        .f8a5-download-panel {
            flex: 1;
            min-width: 340px;
            background: var(--f8a5-white);
            border-radius: 24px;
            padding: 40px;
            box-shadow: 0 24px 80px rgba(0,0,0,0.08);
            border: 1px solid rgba(0,0,0,0.03);
        }

        .f8a5-dl-header {
            margin-bottom: 32px;
            text-align: center;
        }

        .f8a5-btn-group {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .f8a5-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 18px 32px;
            border-radius: 12px;
            font-weight: 700;
            text-decoration: none;
            transition: var(--f8a5-transition);
            cursor: pointer;
            border: none;
            font-size: 16px;
        }

        .f8a5-btn-primary {
            background: var(--f8a5-primary);
            color: var(--f8a5-white);
            box-shadow: 0 8px 24px rgba(238, 28, 37, 0.25);
        }

        .f8a5-btn-primary:hover {
            background: var(--f8a5-primary-dark);
            transform: translateY(-2px);
        }

        .f8a5-btn-outline {
            background: transparent;
            border: 2px solid #eee;
            color: var(--f8a5-text);
        }

        .f8a5-btn-outline:hover {
            border-color: var(--f8a5-primary);
            color: var(--f8a5-primary);
        }

        .f8a5-arch-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 24px;
            justify-content: center;
        }

        .f8a5-arch-tag {
            font-size: 12px;
            color: var(--f8a5-text-light);
            background: var(--f8a5-bg-subtle);
            padding: 4px 12px;
            border-radius: 6px;
        }

        /* Features Section */
        .f8a5-section {
            padding: 96px 24px;
        }

        .f8a5-section-title {
            text-align: center;
            margin-bottom: 64px;
        }

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

        .f8a5-card {
            background: var(--f8a5-white);
            padding: 48px;
            border-radius: var(--f8a5-radius);
            border: 1px solid #f0f0f0;
            transition: var(--f8a5-transition);
        }

        .f8a5-card:hover {
            border-color: var(--f8a5-primary);
            box-shadow: 0 12px 40px rgba(0,0,0,0.05);
            transform: translateY(-8px);
        }

        .f8a5-card-icon {
            font-size: 40px;
            margin-bottom: 24px;
            background: var(--f8a5-bg-subtle);
            width: 80px;
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 20px;
            color: var(--f8a5-primary);
        }

        /* Dynamic Content Section */
        .f8a5-news-section {
            background-color: var(--f8a5-bg-subtle);
        }

        /* Footer */
        .f8a5-footer {
            background: var(--f8a5-secondary);
            color: rgba(255,255,255,0.8);
            padding: 80px 24px 40px;
        }

        .f8a5-footer-inner {
            max-width: var(--f8a5-container-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            justify-content: space-between;
        }

        .f8a5-footer-brand {
            flex: 1;
            min-width: 280px;
        }

        .f8a5-footer-brand-name {
            font-size: 24px;
            font-weight: 700;
            color: var(--f8a5-white);
            margin-bottom: 16px;
        }

        .f8a5-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
            min-width: 0;
        }

        .f8a5-footer-col {
            min-width: 140px;
        }

        .f8a5-footer-col h4 {
            color: var(--f8a5-white);
            margin-bottom: 24px;
            font-size: 16px;
        }

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

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

        .f8a5-footer-col a {
            color: rgba(255,255,255,0.6);
            text-decoration: none;
            transition: var(--f8a5-transition);
        }

        .f8a5-footer-col a:hover {
            color: var(--f8a5-white);
        }

        .f8a5-copyright {
            max-width: var(--f8a5-container-width);
            margin: 48px auto 0;
            padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 14px;
            text-align: center;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .f8a5-hero-inner {
                flex-direction: column;
                text-align: center;
            }
            .f8a5-hero-subtitle {
                margin-left: auto;
                margin-right: auto;
            }
            .f8a5-nav-menu {
                display: none; /* Mobile menu logic handled by JS */
            }
        }

        @media (max-width: 768px) {
            .f8a5-section { padding: 64px 24px; }
            .f8a5-nav-container { height: 64px; }
            .f8a5-download-panel { padding: 32px 20px; }
        }