:root {
            --f8a5-primary: #ff4b2b;
            --f8a5-secondary: #ff416c;
            --f8a5-accent: #ff9a8b;
            --f8a5-dark: #1a1a1a;
            --f8a5-light: #f8f9fa;
            --f8a5-text: #333333;
            --f8a5-gray: #666666;
            --f8a5-container-width: 1320px;
            --f8a5-radius: 16px;
            --f8a5-shadow: 0 10px 30px rgba(0,0,0,0.08);
            --f8a5-transition: all 0.3s ease;
        }

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--f8a5-text);
            line-height: 1.6;
            background-color: #fff;
            overflow-x: hidden;
        }

        /* Utility Classes */
        .f8a5-container {
            max-width: var(--f8a5-container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .f8a5-flex {
            display: flex;
            flex-wrap: wrap;
        }

        .f8a5-grid {
            display: grid;
            gap: 32px;
        }

        /* Navigation */
        .f8a5-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 rgba(0,0,0,0.05);
            transition: var(--f8a5-transition);
        }

        .f8a5-nav {
            height: 80px;
            justify-content: space-between;
            align-items: center;
        }

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

        .f8a5-logo img {
            height: 40px;
            display: block;
        }

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

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

        .f8a5-menu a {
            text-decoration: none;
            color: var(--f8a5-dark);
            font-weight: 500;
            font-size: 16px;
            transition: var(--f8a5-transition);
            padding: 8px 4px;
            position: relative;
            word-break: keep-all;
        }

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

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

        /* Hero Section */
        .f8a5-hero {
            padding: 160px 0 96px;
            background: linear-gradient(135deg, #fff 0%, #fff5f2 100%);
            position: relative;
            overflow: hidden;
        }

        .f8a5-hero::before {
            content: '';
            position: absolute;
            top: -100px;
            right: -100px;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(255,75,43,0.05) 0%, transparent 70%);
            border-radius: 50%;
        }

        .f8a5-hero-inner {
            align-items: center;
            gap: 48px;
        }

        .f8a5-hero-content {
            flex: 1;
            min-width: 300px;
            word-break: break-word;
        }

        .f8a5-hero-tag {
            display: inline-block;
            background: rgba(255, 75, 43, 0.1);
            color: var(--f8a5-primary);
            padding: 6px 16px;
            border-radius: 20px;
            font-weight: 600;
            margin-bottom: 24px;
            font-size: 14px;
        }

        .f8a5-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4rem);
            line-height: 1.2;
            font-weight: 800;
            margin-bottom: 24px;
            color: var(--f8a5-dark);
            white-space: normal;
        }

        .f8a5-hero-subtitle {
            font-size: clamp(1rem, 1.5vw + 0.5rem, 1.25rem);
            color: var(--f8a5-gray);
            margin-bottom: 40px;
            max-width: 600px;
            line-height: 1.8;
        }

        .f8a5-hero-visual {
            flex: 1.2;
            min-width: 300px;
            position: relative;
        }

        .f8a5-hero-visual img {
            width: 100%;
            height: auto;
            border-radius: var(--f8a5-radius);
            box-shadow: 0 30px 60px rgba(0,0,0,0.12);
            transition: transform 0.5s ease;
        }

        .f8a5-hero-visual img:hover {
            transform: translateY(-10px);
        }

        /* Download Matrix Section */
        .f8a5-matrix-section {
            padding: 96px 0;
            background: #fff;
        }

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

        .f8a5-section-title {
            font-size: clamp(2rem, 3vw + 0.5rem, 2.8rem);
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--f8a5-dark);
        }

        .f8a5-matrix-grid {
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
        }

        .f8a5-matrix-card {
            background: var(--f8a5-light);
            border-radius: var(--f8a5-radius);
            padding: 40px;
            transition: var(--f8a5-transition);
            border: 1px solid transparent;
            display: flex;
            flex-direction: column;
            min-width: 0;
        }

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

        .f8a5-matrix-icon {
            font-size: 48px;
            margin-bottom: 24px;
        }

        .f8a5-matrix-name {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .f8a5-matrix-desc {
            color: var(--f8a5-gray);
            margin-bottom: 32px;
            flex-grow: 1;
        }

        .f8a5-btn {
            display: inline-block;
            padding: 14px 32px;
            border-radius: 30px;
            text-decoration: none;
            font-weight: 600;
            text-align: center;
            transition: var(--f8a5-transition);
            cursor: pointer;
            border: none;
        }

        .f8a5-btn-primary {
            background: linear-gradient(90deg, var(--f8a5-primary), var(--f8a5-secondary));
            color: #fff;
            box-shadow: 0 4px 15px rgba(255, 75, 43, 0.3);
        }

        .f8a5-btn-primary:hover {
            transform: scale(1.05);
            box-shadow: 0 6px 20px rgba(255, 75, 43, 0.4);
        }

        .f8a5-matrix-image {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: 12px;
            margin-top: 32px;
        }

        /* Mobile Preview Section */
        .f8a5-mobile-section {
            padding: 96px 0;
            background: #111;
            color: #fff;
            border-radius: 40px;
            margin: 0 24px 96px;
            overflow: hidden;
        }

        .f8a5-mobile-inner {
            align-items: center;
            gap: 64px;
        }

        .f8a5-mobile-img {
            flex: 1;
            min-width: 300px;
            text-align: center;
        }

        .f8a5-mobile-img img {
            max-width: 100%;
            height: auto;
            border-radius: 30px;
            box-shadow: 0 20px 50px rgba(0,0,0,0.5);
        }

        .f8a5-mobile-info {
            flex: 1;
            min-width: 300px;
            word-break: break-word;
        }

        .f8a5-mobile-title {
            font-size: clamp(2rem, 3vw + 0.5rem, 2.5rem);
            margin-bottom: 24px;
            font-weight: 700;
        }

        .f8a5-qr-area {
            display: flex;
            align-items: center;
            gap: 24px;
            background: rgba(255,255,255,0.05);
            padding: 24px;
            border-radius: var(--f8a5-radius);
            margin-top: 40px;
            border: 1px solid rgba(255,255,255,0.1);
        }

        .f8a5-qr-code {
            width: 120px;
            height: 120px;
            background: #fff;
            padding: 10px;
            border-radius: 8px;
        }

        .f8a5-qr-code img {
            width: 100%;
            height: 100%;
        }

        .f8a5-qr-text {
            font-size: 16px;
            color: #ccc;
        }

        /* Features Section */
        .f8a5-feature-row {
            padding: 80px 0;
            align-items: center;
            gap: 64px;
        }

        .f8a5-feature-row:nth-child(even) {
            flex-direction: row-reverse;
        }

        .f8a5-feature-text {
            flex: 1;
            min-width: 300px;
            word-break: break-word;
        }

        .f8a5-feature-image {
            flex: 1;
            min-width: 300px;
        }

        .f8a5-feature-image img {
            width: 100%;
            border-radius: var(--f8a5-radius);
            box-shadow: var(--f8a5-shadow);
        }

        /* Updates Section */
        .f8a5-updates {
            padding: 96px 0;
            background: var(--f8a5-light);
        }

        .f8a5-update-list {
            grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
        }

        .f8a5-update-item {
            background: #fff;
            padding: 32px;
            border-radius: var(--f8a5-radius);
            display: flex;
            gap: 24px;
            min-width: 0;
        }

        .f8a5-update-date {
            flex: 0 0 80px;
            text-align: center;
            border-right: 1px solid #eee;
            padding-right: 24px;
        }

        .f8a5-date-day {
            display: block;
            font-size: 24px;
            font-weight: 800;
            color: var(--f8a5-primary);
        }

        .f8a5-date-month {
            display: block;
            font-size: 14px;
            color: var(--f8a5-gray);
        }

        /* Footer */
        .f8a5-footer {
            padding: 80px 0 40px;
            background: #fdfdfd;
            border-top: 1px solid #eee;
        }

        .f8a5-footer-grid {
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            margin-bottom: 64px;
        }

        .f8a5-footer-brand {
            grid-column: span 2;
        }

        .f8a5-brand-name {
            font-size: 24px;
            font-weight: 800;
            color: var(--f8a5-primary);
            margin-bottom: 24px;
        }

        .f8a5-footer-links h4 {
            font-size: 18px;
            margin-bottom: 24px;
            font-weight: 700;
        }

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

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

        .f8a5-footer-links a {
            text-decoration: none;
            color: var(--f8a5-gray);
            transition: var(--f8a5-transition);
        }

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

        .f8a5-footer-bottom {
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid #eee;
            color: #999;
            font-size: 14px;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .f8a5-hero-title { font-size: 3rem; }
        }

        @media (max-width: 768px) {
            .f8a5-menu {
                display: none; /* In a real site, implement a hamburger menu */
            }
            .f8a5-hero { padding: 120px 0 64px; }
            .f8a5-matrix-grid { grid-template-columns: 1fr; }
            .f8a5-update-list { grid-template-columns: 1fr; }
            .f8a5-mobile-section { margin: 0 0 64px; border-radius: 0; }
            .f8a5-feature-row { flex-direction: column !important; text-align: center; }
            .f8a5-footer-brand { grid-column: span 1; }
        }