/* roulang page: index */
:root {
            --primary: #2563EB;
            --primary-dark: #1D4ED8;
            --primary-darker: #1E40AF;
            --secondary: #0EA5E9;
            --bg: #F4F7FB;
            --card-bg: #FFFFFF;
            --text: #182A3D;
            --text-secondary: #546E7A;
            --text-weak: #90A4AE;
            --border: #DEE7F0;
            --shadow: 0 4px 16px rgba(22, 80, 160, 0.08);
            --shadow-hover: 0 10px 24px rgba(22, 80, 160, 0.14);
            --radius: 12px;
            --radius-sm: 8px;
            --footer-bg: #0B1E3A;
            --transition: all 0.3s ease;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Segoe UI", sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            margin: 0;
            padding: 0;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }

        a:hover {
            color: var(--primary-dark);
        }

        img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius);
        }

        .grid-container {
            max-width: 1200px;
            padding-left: 24px;
            padding-right: 24px;
        }

        .grid-margin-x {
            margin-left: -12px;
            margin-right: -12px;
        }

        .cell {
            padding-left: 12px;
            padding-right: 12px;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            background: #fff;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
            transition: box-shadow 0.3s;
        }

        .site-header.scrolled {
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
            gap: 16px;
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .brand-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            font-weight: 800;
            font-size: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            letter-spacing: -0.5px;
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
        }

        .brand-text {
            font-size: 20px;
            font-weight: 700;
            color: var(--text);
            letter-spacing: -0.3px;
        }

        .main-nav {
            display: flex;
            gap: 32px;
            align-items: center;
            flex: 1;
            justify-content: center;
        }

        .main-nav a {
            position: relative;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 8px 2px;
        }

        .main-nav a:hover {
            color: var(--primary);
            transform: translateY(-1px);
        }

        .main-nav a.active {
            color: var(--primary);
            font-weight: 600;
        }

        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            right: 0;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .search-box {
            display: flex;
            align-items: center;
            background: var(--bg);
            border-radius: 20px;
            padding: 6px 14px;
            width: 180px;
            transition: var(--transition);
            border: 1px solid transparent;
        }

        .search-box:focus-within {
            border-color: var(--primary);
            background: #fff;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
            width: 220px;
        }

        .search-box i {
            color: var(--text-weak);
            font-size: 13px;
            margin-right: 8px;
        }

        .search-box input {
            border: none;
            outline: none;
            background: transparent;
            font-size: 13px;
            width: 100%;
            color: var(--text);
        }

        .btn-login {
            font-size: 14px;
            color: var(--primary);
            font-weight: 500;
            padding: 6px 12px;
            border-radius: 6px;
        }

        .btn-login:hover {
            background: #EFF6FF;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: var(--radius-sm);
            padding: 12px 32px;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.4);
            color: #fff;
        }

        .btn-primary:active {
            background: var(--primary-darker);
            transform: translateY(0);
        }

        .btn-primary:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.5);
            outline-offset: 2px;
        }

        .btn-sm {
            padding: 8px 20px;
            font-size: 14px;
        }

        .btn-lg {
            padding: 16px 40px;
            font-size: 17px;
            border-radius: 10px;
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: var(--primary);
            border: 1.5px solid var(--primary);
            border-radius: var(--radius-sm);
            padding: 12px 32px;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }

        .btn-secondary:hover {
            background: #EFF6FF;
            transform: translateY(-2px);
        }

        .btn-secondary:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.4);
            outline-offset: 2px;
        }

        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 22px;
            color: var(--text);
            cursor: pointer;
            padding: 8px;
            border-radius: 8px;
        }

        .hamburger:hover {
            background: var(--bg);
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            padding: 80px 0 60px;
            overflow: hidden;
            background: linear-gradient(135deg, #F0F5FF 0%, #F8FBFF 50%, #F4F9FC 100%);
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -80px;
            right: -100px;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(37, 99, 235, 0.08), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: -60px;
            left: -80px;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(14, 165, 233, 0.06), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero .grid-container {
            position: relative;
            z-index: 1;
        }

        .hero h1 {
            font-size: clamp(32px, 5vw, 48px);
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 20px;
            letter-spacing: -0.8px;
            color: var(--text);
        }

        .hero h1 .text-primary {
            color: var(--primary);
            position: relative;
        }

        .hero-sub {
            font-size: 17px;
            line-height: 1.7;
            color: var(--text-secondary);
            max-width: 480px;
            margin-bottom: 32px;
        }

        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 20px;
        }

        .hero-note {
            font-size: 13px;
            color: var(--text-weak);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .hero-note i {
            color: var(--success, #16A34A);
        }

        .hero-visual {
            position: relative;
            text-align: center;
        }

        .hero-visual img {
            border-radius: 14px;
            box-shadow: 0 8px 32px rgba(22, 80, 160, 0.18);
            border: 2px solid #fff;
        }

        .float-deco {
            position: absolute;
            border-radius: 50%;
            pointer-events: none;
        }

        .deco-1 {
            width: 28px;
            height: 28px;
            background: var(--secondary);
            opacity: 0.2;
            top: 10%;
            right: 5%;
            animation: float 3s ease-in-out infinite;
        }

        .deco-2 {
            width: 14px;
            height: 14px;
            background: var(--primary);
            opacity: 0.15;
            bottom: 20%;
            left: 8%;
            animation: float 4s ease-in-out infinite 1s;
        }

        @keyframes float {
            0%,
            100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-12px);
            }
        }

        /* ===== Trust Bar ===== */
        .trust-bar {
            padding: 48px 0;
            background: #fff;
            border-bottom: 1px solid var(--border);
        }

        .trust-item {
            text-align: center;
            padding: 24px 16px;
        }

        .trust-item i {
            font-size: 30px;
            color: var(--primary);
            margin-bottom: 14px;
            display: inline-block;
        }

        .trust-item h3 {
            font-size: 17px;
            font-weight: 600;
            margin-bottom: 4px;
            color: var(--text);
        }

        .trust-item p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.5;
            margin: 0;
        }

        /* ===== Section Head ===== */
        .section-head {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-head h2 {
            font-size: clamp(24px, 3.5vw, 34px);
            font-weight: 700;
            color: var(--text);
            position: relative;
            padding-bottom: 14px;
            display: inline-block;
            margin-bottom: 10px;
            letter-spacing: -0.5px;
        }

        .section-head h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 48px;
            height: 3px;
            background: var(--primary);
            border-radius: 3px;
        }

        .section-head p {
            font-size: 15px;
            color: var(--text-secondary);
            margin: 0;
        }

        /* ===== Showcase Slider ===== */
        .showcase {
            padding: 80px 0;
            background: var(--bg);
        }

        .showcase-slider {
            position: relative;
            background: #F0F4F9;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: var(--shadow);
            min-height: 400px;
        }

        .slide-item {
            display: none;
            grid-template-columns: 1fr 1fr;
            align-items: center;
            gap: 40px;
            padding: 48px;
            min-height: 400px;
            animation: slideIn 0.3s ease;
        }

        .slide-item.active {
            display: grid;
        }

        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateX(30px);
            }
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }

        .slide-content h3 {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text);
        }

        .slide-content p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 20px;
        }

        .slide-tags {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }

        .slide-tags span {
            background: rgba(37, 99, 235, 0.1);
            color: var(--primary);
            font-size: 13px;
            padding: 4px 14px;
            border-radius: 20px;
            font-weight: 500;
        }

        .slide-visual img {
            border-radius: 12px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
        }

        .slider-controls {
            position: absolute;
            bottom: 20px;
            right: 24px;
            display: flex;
            gap: 10px;
            z-index: 2;
        }

        .slider-btn {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: #fff;
            border: 1px solid var(--border);
            color: var(--primary);
            font-size: 16px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
        }

        .slider-btn:hover {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            transform: scale(1.05);
        }

        .slider-dots {
            position: absolute;
            bottom: 28px;
            left: 24px;
            display: flex;
            gap: 6px;
            z-index: 2;
        }

        .slider-dots .dot {
            width: 8px;
            height: 8px;
            border-radius: 4px;
            background: #C3D0DF;
            transition: var(--transition);
            cursor: pointer;
            border: none;
            padding: 0;
        }

        .slider-dots .dot.active {
            width: 24px;
            background: var(--secondary);
        }

        /* ===== News Section ===== */
        .news-section {
            padding: 80px 0;
            background: #fff;
        }

        .news-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 24px;
            height: 100%;
            display: flex;
            flex-direction: column;
            transition: var(--transition);
            box-shadow: 0 2px 8px rgba(18, 52, 96, 0.06);
        }

        .news-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: transparent;
        }

        .news-category {
            display: inline-block;
            background: rgba(37, 99, 235, 0.1);
            color: var(--primary);
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 4px;
            margin-bottom: 14px;
            align-self: flex-start;
        }

        .news-card h3 {
            font-size: 17px;
            font-weight: 600;
            line-height: 1.5;
            margin-bottom: 10px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .news-card h3 a {
            color: var(--text);
        }

        .news-card h3 a:hover {
            color: var(--primary);
        }

        .news-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 16px;
            flex-grow: 1;
        }

        .news-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-top: 1px solid var(--border);
            padding-top: 14px;
        }

        .news-date {
            font-size: 13px;
            color: var(--text-weak);
        }

        .news-more {
            font-size: 14px;
            font-weight: 500;
            color: var(--primary);
        }

        .news-more:hover {
            color: var(--primary-dark);
        }

        .empty-state {
            background: #F8FAFC;
            border: 2px dashed var(--border);
            border-radius: var(--radius);
            padding: 48px;
            text-align: center;
            color: var(--text-weak);
            font-size: 15px;
        }

        /* ===== System Requirements ===== */
        .sysreq {
            padding: 80px 0;
            background: var(--bg);
        }

        .sysreq .section-title {
            font-size: clamp(24px, 3vw, 30px);
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--text);
        }

        .sysreq .section-desc {
            font-size: 15px;
            color: var(--text-secondary);
            margin-bottom: 24px;
            line-height: 1.7;
            max-width: 340px;
        }

        .req-card {
            background: #fff;
            border-radius: var(--radius);
            padding: 28px;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border: 1px solid transparent;
            height: 100%;
        }

        .req-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
        }

        .req-head {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-bottom: 20px;
            border-bottom: 1px solid var(--border);
            padding-bottom: 16px;
        }

        .req-head i {
            font-size: 28px;
            color: var(--primary);
        }

        .req-head h3 {
            font-size: 19px;
            font-weight: 600;
            margin: 0;
            flex: 1;
        }

        .badge {
            background: rgba(22, 163, 74, 0.1);
            color: #16A34A;
            font-size: 12px;
            font-weight: 600;
            padding: 3px 10px;
            border-radius: 4px;
        }

        .req-card ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .req-card li {
            display: flex;
            justify-content: space-between;
            font-size: 14px;
            color: var(--text-secondary);
            padding: 8px 0;
            border-bottom: 1px solid #F0F4F9;
        }

        .req-card li:last-child {
            border: none;
        }

        .req-card li span {
            font-weight: 500;
            color: var(--text-weak);
            font-size: 13px;
        }

        /* ===== Testimonials ===== */
        .testimonials {
            padding: 80px 0;
            background: #EAF1F8;
        }

        .testimonial-card {
            background: #fff;
            border-radius: var(--radius);
            padding: 24px;
            box-shadow: 0 2px 8px rgba(18, 52, 96, 0.06);
            margin-bottom: 24px;
            transition: var(--transition);
            break-inside: avoid;
        }

        .testimonial-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
        }

        .stars {
            color: #F5A623;
            font-size: 14px;
            margin-bottom: 10px;
            letter-spacing: 2px;
        }

        .testimonial-card>p {
            font-size: 14px;
            line-height: 1.7;
            color: var(--text-secondary);
            margin-bottom: 16px;
        }

        .user {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .avatar {
            width: 34px;
            height: 34px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            font-weight: 600;
        }

        .user span:nth-child(2) {
            font-size: 14px;
            font-weight: 600;
            color: var(--text);
        }

        .user .tag {
            font-size: 12px;
            color: var(--text-weak);
            background: var(--bg);
            padding: 2px 8px;
            border-radius: 4px;
            font-weight: 400;
        }

        .masonry {
            column-count: 3;
            column-gap: 24px;
        }

        /* ===== Download CTA ===== */
        .download-cta {
            background: var(--footer-bg);
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .download-cta::before {
            content: '';
            position: absolute;
            top: 40px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 80px;
            background: radial-gradient(circle, rgba(14, 165, 233, 0.3), transparent 70%);
            border-radius: 50%;
        }

        .download-cta h2 {
            color: #fff;
            font-size: clamp(24px, 3.5vw, 34px);
            font-weight: 700;
            margin-bottom: 12px;
            position: relative;
        }

        .download-cta>div>p {
            color: #A8C0E0;
            font-size: 16px;
            margin-bottom: 40px;
        }

        .download-buttons {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 24px;
            position: relative;
        }

        .btn-download {
            display: inline-flex;
            align-items: center;
            gap: 12px;
            background: #fff;
            color: var(--text);
            padding: 16px 24px;
            border-radius: var(--radius);
            font-size: 15px;
            font-weight: 600;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
            transition: var(--transition);
            min-width: 150px;
            justify-content: center;
        }

        .btn-download:hover {
            transform: translateY(-4px);
            box-shadow: 0 8px 24px rgba(14, 165, 233, 0.3);
            color: var(--primary);
        }

        .btn-download i {
            font-size: 22px;
            color: var(--primary);
        }

        .btn-download.dark {
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #fff;
            backdrop-filter: blur(4px);
        }

        .btn-download.dark i {
            color: #fff;
        }

        .btn-download.dark:hover {
            background: rgba(255, 255, 255, 0.18);
            color: #fff;
        }

        .version-note {
            color: #7A9BC0;
            font-size: 13px;
            margin-top: 24px;
        }

        /* ===== FAQ ===== */
        .faq-section {
            padding: 80px 0;
            background: #fff;
        }

        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow);
        }

        .faq-question {
            width: 100%;
            background: none;
            border: none;
            padding: 18px 24px;
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            text-align: left;
            font-family: inherit;
            transition: var(--transition);
        }

        .faq-question:hover {
            color: var(--primary);
        }

        .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--bg);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: var(--primary);
            transition: transform 0.3s;
            flex-shrink: 0;
        }

        .faq-item.active .faq-icon {
            transform: rotate(45deg);
            background: var(--primary);
            color: #fff;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            padding: 0 24px;
        }

        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--footer-bg);
            color: #A8C0E0;
            padding: 60px 0 0;
        }

        .footer-top {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .footer-brand .brand-icon {
            margin-bottom: 14px;
        }

        .footer-brand .brand-text {
            color: #fff;
            font-size: 20px;
        }

        .footer-brand p {
            font-size: 14px;
            color: #7A9BC0;
            margin-top: 12px;
            line-height: 1.7;
            max-width: 260px;
        }

        .footer-col h4 {
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .footer-col a {
            display: block;
            color: #7A9BC0;
            font-size: 14px;
            padding: 5px 0;
            transition: var(--transition);
        }

        .footer-col a:hover {
            color: var(--secondary);
            padding-left: 4px;
        }

        .footer-bottom {
            padding: 20px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 12px;
            color: #5A7A9C;
            flex-wrap: wrap;
            gap: 12px;
        }

        .footer-bottom p {
            margin: 0;
        }

        /* ===== Mobile Nav ===== */
        .mobile-menu {
            display: none;
            position: absolute;
            top: 64px;
            left: 0;
            right: 0;
            background: #fff;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
            padding: 20px;
            z-index: 999;
        }

        .mobile-menu.open {
            display: block;
        }

        .mobile-menu a {
            display: block;
            padding: 12px 16px;
            border-radius: 8px;
            font-size: 15px;
            color: var(--text);
            font-weight: 500;
            border-bottom: 1px solid var(--bg);
        }

        .mobile-menu a:hover {
            background: var(--bg);
            color: var(--primary);
        }

        .mobile-menu a.active {
            color: var(--primary);
            background: rgba(37, 99, 235, 0.06);
        }

        .mobile-menu .header-actions {
            margin-top: 16px;
            display: flex;
            flex-direction: column;
            gap: 12px;
            width: 100%;
        }

        .mobile-menu .search-box {
            width: 100%;
        }

        .mobile-menu .btn-primary {
            width: 100%;
            justify-content: center;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .main-nav {
                gap: 20px;
            }
            .search-box {
                width: 140px;
            }
            .search-box:focus-within {
                width: 180px;
            }
            .hero h1 {
                font-size: 34px;
            }
            .slide-item {
                padding: 32px;
                gap: 24px;
            }
            .masonry {
                column-count: 2;
            }
        }

        @media (max-width: 768px) {
            .main-nav {
                display: none;
            }
            .header-actions {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .hero {
                padding: 48px 0 40px;
            }
            .hero h1 {
                font-size: 30px;
            }
            .hero-visual {
                margin-top: 32px;
            }
            .slide-item {
                grid-template-columns: 1fr;
                padding: 24px;
                min-height: auto;
            }
            .slide-visual {
                order: -1;
            }
            .showcase-slider {
                min-height: auto;
            }
            .slider-controls {
                position: static;
                justify-content: flex-end;
                padding: 16px 24px;
            }
            .slider-dots {
                position: static;
                justify-content: flex-start;
                padding: 0 24px 24px;
            }
            .footer-top {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .download-buttons {
                flex-direction: column;
                align-items: stretch;
                max-width: 320px;
                margin: 0 auto 24px;
            }
            .btn-download {
                width: 100%;
            }
            .sysreq .section-desc {
                max-width: 100%;
            }
            .faq-question {
                font-size: 14px;
                padding: 16px 16px;
            }
            .faq-answer {
                padding: 0 16px;
            }
            .faq-item.active .faq-answer {
                padding: 0 16px 16px;
            }
        }

        @media (max-width: 640px) {
            .trust-bar .cell {
                flex: 0 0 50%;
                max-width: 50%;
            }
            .masonry {
                column-count: 1;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .hero-actions .btn-lg {
                width: 100%;
                justify-content: center;
            }
            .news-card {
                padding: 20px;
            }
        }

        @media (max-width: 520px) {
            .grid-container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .trust-bar .cell {
                flex: 0 0 100%;
                max-width: 100%;
            }
            .footer-top {
                grid-template-columns: 1fr;
            }
        }

/* roulang page: article */
:root {
            --primary: #2563EB;
            --primary-hover: #1D4ED8;
            --primary-active: #1E40AF;
            --secondary: #0EA5E9;
            --bg: #F4F7FB;
            --white: #FFFFFF;
            --text-main: #182A3D;
            --text-sub: #546E7A;
            --text-mute: #90A4AE;
            --border: #DEE7F0;
            --dark: #0B1E3A;
            --shadow-card: 0 4px 16px rgba(22, 80, 160, 0.08);
            --shadow-hover: 0 8px 24px rgba(22, 80, 160, 0.14);
            --radius: 12px;
            --radius-sm: 8px;
            --font-main: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            --font-num: "Inter", "Segoe UI", sans-serif;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-main);
            background: var(--bg);
            color: var(--text-main);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: all .2s ease;
        }
        button,
        input {
            font-family: inherit;
        }
        .grid-container {
            max-width: 1200px;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* ===== 按钮 ===== */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: var(--radius-sm);
            padding: 12px 32px;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: all .25s ease;
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2);
        }
        .btn-primary:hover {
            background: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(37, 99, 235, 0.3);
            color: #fff;
        }
        .btn-primary:active {
            background: var(--primary-active);
            transform: translateY(0);
        }
        .btn-primary:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.3);
            outline-offset: 2px;
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: transparent;
            color: var(--primary);
            border: 1.5px solid var(--primary);
            border-radius: var(--radius-sm);
            padding: 12px 32px;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: all .25s ease;
        }
        .btn-secondary:hover {
            background: #EFF6FF;
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(37, 99, 235, 0.12);
        }
        .btn-secondary:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.3);
            outline-offset: 2px;
        }
        .btn-white {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            background: #fff;
            color: var(--dark);
            border: none;
            border-radius: var(--radius-sm);
            padding: 16px 40px;
            font-size: 17px;
            font-weight: 700;
            cursor: pointer;
            transition: all .25s ease;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
        }
        .btn-white:hover {
            background: #eef2f7;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
            color: var(--primary);
        }
        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            background: transparent;
            color: rgba(255, 255, 255, 0.9);
            border: 1.5px solid rgba(255, 255, 255, 0.55);
            border-radius: var(--radius-sm);
            padding: 16px 32px;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: all .25s ease;
        }
        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #fff;
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-lg {
            padding: 16px 40px;
            font-size: 17px;
        }
        .btn-sm {
            padding: 9px 22px;
            font-size: 14px;
        }
        .btn-medium {
            padding: 12px 28px;
            font-size: 14px;
        }

        /* ===== 标签 ===== */
        .tag-label {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: #EFF6FF;
            color: var(--primary);
            font-size: 13px;
            font-weight: 500;
            padding: 5px 14px;
            border-radius: 20px;
            border: 1px solid rgba(37, 99, 235, 0.12);
        }

        /* ===== 导航 ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            transition: box-shadow .3s ease;
        }
        .site-header.scrolled {
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
            gap: 24px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .brand-icon {
            width: 34px;
            height: 34px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: var(--font-num);
            font-weight: 800;
            font-size: 14px;
            color: #fff;
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
        }
        .brand-text {
            font-size: 20px;
            font-weight: 800;
            color: var(--text-main);
            letter-spacing: 0.5px;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 28px;
            margin-left: 12px;
        }
        .main-nav a {
            position: relative;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-sub);
            padding: 8px 2px;
            transition: color .2s;
        }
        .main-nav a::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 0;
            width: 100%;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
            transform: scaleX(0);
            transform-origin: left;
            transition: transform .25s ease;
        }
        .main-nav a:hover {
            color: var(--text-main);
        }
        .main-nav a:hover::after {
            transform: scaleX(1);
        }
        .main-nav a.active {
            color: var(--primary);
            font-weight: 600;
        }
        .main-nav a.active::after {
            transform: scaleX(1);
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-shrink: 0;
        }
        .search-box {
            position: relative;
            display: flex;
            align-items: center;
        }
        .search-box .search-icon {
            position: absolute;
            left: 14px;
            width: 15px;
            height: 15px;
            color: var(--text-mute);
            pointer-events: none;
            transition: color .2s;
        }
        .search-box input {
            width: 180px;
            height: 38px;
            background: var(--bg);
            border: 1px solid transparent;
            border-radius: 20px;
            padding: 0 16px 0 38px;
            font-size: 14px;
            color: var(--text-main);
            transition: all .3s ease;
            outline: none;
        }
        .search-box input:focus {
            width: 220px;
            background: #fff;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
        }
        .search-box input::placeholder {
            color: var(--text-mute);
        }
        .btn-login {
            font-size: 14px;
            font-weight: 500;
            color: var(--text-sub);
            padding: 8px 12px;
            border-radius: var(--radius-sm);
            transition: all .2s;
        }
        .btn-login:hover {
            background: rgba(0, 0, 0, 0.04);
            color: var(--text-main);
        }
        .btn-download-nav {
            padding: 9px 22px;
            font-size: 14px;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
        }
        .hamburger span {
            width: 22px;
            height: 2px;
            background: var(--text-main);
            border-radius: 2px;
            transition: all .3s;
        }
        .mobile-menu {
            display: none;
            position: absolute;
            top: 64px;
            left: 0;
            right: 0;
            background: #fff;
            border-bottom: 1px solid var(--border);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
            padding: 20px 24px;
            z-index: 99;
        }
        .mobile-menu.open {
            display: block;
        }
        .mobile-menu a {
            display: block;
            padding: 12px 0;
            font-size: 16px;
            font-weight: 500;
            color: var(--text-main);
            border-bottom: 1px solid #f0f4f8;
        }
        .mobile-menu a:last-of-type {
            border-bottom: none;
        }
        .mobile-menu a.active {
            color: var(--primary);
        }
        .mobile-menu .btn-primary {
            margin-top: 16px;
            width: 100%;
        }

        /* ===== 文章 Hero ===== */
        .article-hero {
            position: relative;
            background: linear-gradient(135deg, rgba(11, 30, 58, 0.93) 0%, rgba(37, 99, 235, 0.82) 100%),
                url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            padding: 72px 0 64px;
            color: #fff;
        }
        .breadcrumb {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.72);
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 4px;
        }
        .breadcrumb a {
            color: rgba(255, 255, 255, 0.72);
            transition: color .2s;
        }
        .breadcrumb a:hover {
            color: #fff;
        }
        .breadcrumb .sep {
            margin: 0 8px;
            color: rgba(255, 255, 255, 0.35);
        }
        .breadcrumb .current {
            color: rgba(255, 255, 255, 0.95);
            max-width: 260px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .article-title {
            font-size: clamp(28px, 4vw, 42px);
            font-weight: 800;
            line-height: 1.3;
            color: #fff;
            max-width: 880px;
            margin-bottom: 20px;
            text-shadow: 0 2px 16px rgba(0, 0, 0, 0.15);
        }
        .article-meta {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.72);
        }
        .article-meta .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 7px;
        }
        .article-meta .meta-item i {
            font-size: 13px;
            opacity: 0.75;
        }
        .article-hero .tag-label {
            background: rgba(255, 255, 255, 0.16);
            color: #fff;
            border-color: rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(4px);
        }

        /* ===== 正文区域 ===== */
        .article-main {
            background: var(--bg);
            padding: 56px 0 24px;
        }
        .article-body-wrap {
            max-width: 880px;
            margin: 0 auto;
        }
        .article-body {
            background: var(--white);
            border-radius: 16px;
            box-shadow: var(--shadow-card);
            padding: 48px 56px;
            font-size: 16px;
            line-height: 1.9;
            color: var(--text-main);
            border: 1px solid #f0f4f8;
        }
        .article-body p {
            margin-bottom: 1.6em;
        }
        .article-body h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-main);
            margin: 40px 0 16px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--primary);
            position: relative;
            width: fit-content;
            max-width: 100%;
            border-image: linear-gradient(90deg, var(--primary) 0%, rgba(37, 99, 235, 0.1) 100%) 1;
            border-bottom: none;
        }
        .article-body h2::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: -2px;
            width: 100%;
            height: 2px;
            background: linear-gradient(90deg, var(--primary) 0%, rgba(37, 99, 235, 0.15) 90%);
            border-radius: 2px;
        }
        .article-body h3 {
            font-size: 19px;
            font-weight: 600;
            color: var(--text-main);
            margin: 32px 0 12px;
        }
        .article-body a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .article-body a:hover {
            color: var(--primary-hover);
        }
        .article-body blockquote {
            border-left: 4px solid var(--primary);
            background: #F8FAFC;
            padding: 16px 24px;
            margin: 24px 0;
            border-radius: 0 12px 12px 0;
            color: var(--text-sub);
            font-size: 15px;
            font-style: italic;
        }
        .article-body ul,
        .article-body ol {
            margin: 0 0 24px 0;
            padding-left: 1.6em;
        }
        .article-body li {
            margin-bottom: 8px;
        }
        .article-body ul li::marker {
            color: var(--primary);
        }
        .article-body img {
            border-radius: var(--radius);
            box-shadow: var(--shadow-card);
            margin: 24px auto;
        }
        .article-body code {
            background: #F1F5F9;
            border-radius: 4px;
            padding: 2px 8px;
            font-size: 14px;
            font-family: var(--font-num);
            color: var(--primary);
        }
        .article-body pre {
            background: #0B1E3A;
            color: #E2E8F0;
            border-radius: var(--radius);
            padding: 20px 24px;
            overflow-x: auto;
            font-size: 14px;
            line-height: 1.7;
            margin: 24px 0;
        }
        .article-body pre code {
            background: transparent;
            color: inherit;
            padding: 0;
        }
        .article-empty {
            text-align: center;
            padding: 60px 20px;
        }
        .article-empty i {
            font-size: 48px;
            color: var(--text-mute);
            margin-bottom: 16px;
        }
        .article-empty p {
            font-size: 18px;
            color: var(--text-sub);
            margin-bottom: 24px;
        }
        .article-meta-bottom {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 32px;
            padding-top: 20px;
            border-top: 1px solid var(--border);
        }

        /* ===== 相关推荐 ===== */
        .related-section {
            background: #fff;
            padding: 64px 0 48px;
        }
        .section-header {
            text-align: center;
            margin-bottom: 40px;
        }
        .section-header h2 {
            font-size: clamp(24px, 3.5vw, 34px);
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 8px;
            position: relative;
            display: inline-block;
        }
        .section-header h2::after {
            content: "";
            display: block;
            width: 48px;
            height: 3px;
            background: var(--primary);
            border-radius: 3px;
            margin: 10px auto 0;
        }
        .section-header p {
            color: var(--text-sub);
            font-size: 15px;
            margin-top: 12px;
        }
        .related-grid {
            row-gap: 24px;
        }
        .related-card {
            display: flex;
            flex-direction: column;
            background: var(--bg);
            border-radius: 14px;
            overflow: hidden;
            border: 1px solid #f0f4f8;
            transition: all .3s ease;
            height: 100%;
        }
        .related-card:hover {
            background: #fff;
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
            border-color: transparent;
        }
        .related-card img {
            width: 100%;
            height: 168px;
            object-fit: cover;
            display: block;
        }
        .related-info {
            padding: 20px 22px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .related-info h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 8px;
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-info p {
            font-size: 13px;
            color: var(--text-sub);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-top: auto;
        }
        .related-card:hover .related-info h4 {
            color: var(--primary);
        }

        /* ===== 返回按钮 ===== */
        .article-return {
            text-align: center;
            padding: 40px 0 56px;
            background: #fff;
        }
        .article-return .btn-secondary {
            padding: 12px 32px;
        }

        /* ===== 下载 CTA ===== */
        .download-cta {
            background: var(--dark);
            position: relative;
            overflow: hidden;
            padding: 80px 0;
            text-align: center;
        }
        .download-cta::before {
            content: "";
            position: absolute;
            top: -80px;
            right: -80px;
            width: 280px;
            height: 280px;
            background: radial-gradient(circle, rgba(37, 99, 235, 0.35) 0%, transparent 70%);
            border-radius: 50%;
        }
        .download-cta::after {
            content: "";
            position: absolute;
            bottom: -60px;
            left: -60px;
            width: 220px;
            height: 220px;
            background: radial-gradient(circle, rgba(14, 165, 233, 0.28) 0%, transparent 70%);
            border-radius: 50%;
        }
        .download-cta .grid-container {
            position: relative;
            z-index: 2;
        }
        .download-cta h2 {
            font-size: clamp(26px, 3.5vw, 36px);
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
        }
        .download-cta p {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.78);
            margin-bottom: 36px;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-buttons {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 18px;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: #081526;
            color: rgba(255, 255, 255, 0.7);
            padding: 56px 0 0;
            font-size: 14px;
        }
        .footer-top {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .brand-icon {
            width: 32px;
            height: 32px;
            font-size: 13px;
        }
        .footer-brand .brand-text {
            font-size: 18px;
            color: #fff;
            font-weight: 700;
        }
        .footer-brand p {
            margin-top: 14px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.5);
            line-height: 1.7;
            max-width: 280px;
        }
        .footer-brand .brand-block {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-col a {
            display: block;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.5);
            margin-bottom: 10px;
            transition: all .2s;
        }
        .footer-col a:hover {
            color: var(--secondary);
            transform: translateX(3px);
        }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 10px;
            padding: 20px 0;
            font-size: 12px;
            color: rgba(255, 255, 255, 0.35);
        }

        /* ===== 响应式 ===== */
        @media screen and (max-width: 1024px) {
            .main-nav {
                gap: 18px;
            }
            .search-box input {
                width: 140px;
            }
            .search-box input:focus {
                width: 170px;
            }
            .footer-top {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media screen and (max-width: 768px) {
            .main-nav {
                display: none;
            }
            .header-actions .search-box,
            .header-actions .btn-login {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .header-actions {
                gap: 8px;
            }
            .article-hero {
                padding: 48px 0 44px;
            }
            .article-body {
                padding: 32px 24px;
                border-radius: 12px;
            }
            .article-title {
                font-size: 24px;
            }
            .cta-buttons {
                flex-direction: column;
                align-items: stretch;
                max-width: 320px;
                margin: 0 auto;
            }
            .cta-buttons .btn-white,
            .cta-buttons .btn-outline-light {
                width: 100%;
            }
            .footer-top {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media screen and (max-width: 520px) {
            .header-inner {
                height: 56px;
                gap: 12px;
            }
            .brand-text {
                font-size: 17px;
            }
            .btn-download-nav {
                padding: 8px 16px;
                font-size: 13px;
            }
            .footer-top {
                grid-template-columns: 1fr;
                gap: 24px;
                padding-bottom: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .article-meta {
                gap: 12px;
                font-size: 13px;
            }
            .related-card img {
                height: 140px;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #2563EB;
            --primary-dark: #1D4ED8;
            --primary-darker: #1E40AF;
            --primary-light: #EFF6FF;
            --secondary: #0EA5E9;
            --bg: #F4F7FB;
            --white: #FFFFFF;
            --text: #182A3D;
            --text-secondary: #546E7A;
            --text-muted: #90A4AE;
            --border: #DEE7F0;
            --shadow: 0 4px 16px rgba(22, 80, 160, 0.08);
            --shadow-hover: 0 8px 24px rgba(22, 80, 160, 0.14);
            --radius: 12px;
            --radius-sm: 8px;
            --dark-bg: #0B1E3A;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", "Segoe UI", sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-family);
            background-color: var(--bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

        img {
            max-width: 100%;
            display: block;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }

        a:hover {
            color: var(--primary-dark);
        }

        .grid-container {
            max-width: 1200px;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* ===== Header & Nav ===== */
        .site-header {
            background: var(--white);
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 1px solid var(--border);
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .brand-icon {
            width: 32px;
            height: 32px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: 8px;
            color: #fff;
            font-weight: 700;
            font-size: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .brand-text {
            font-size: 20px;
            font-weight: 700;
            color: var(--text);
        }

        .main-nav {
            display: flex;
            gap: 28px;
        }

        .main-nav a {
            position: relative;
            padding: 6px 0;
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 14px;
        }

        .main-nav a:hover {
            color: var(--primary);
        }

        .main-nav a.active {
            color: var(--primary);
        }

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

        .header-right {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .search-box {
            position: relative;
        }

        .search-box input {
            width: 180px;
            height: 36px;
            border: 1px solid var(--border);
            border-radius: 18px;
            padding: 0 36px 0 14px;
            font-size: 13px;
            background: var(--bg);
            transition: var(--transition);
        }

        .search-box input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
            width: 220px;
            background: var(--white);
        }

        .search-box i {
            position: absolute;
            right: 12px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-muted);
            font-size: 14px;
            pointer-events: none;
        }

        .ghost-btn {
            border: none;
            background: transparent;
            color: var(--text-secondary);
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            padding: 8px 12px;
            border-radius: 6px;
        }

        .ghost-btn:hover {
            color: var(--primary);
            background: var(--primary-light);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: var(--radius-sm);
            padding: 12px 32px;
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(37, 99, 235, 0.3);
            color: #fff;
        }

        .btn-primary.btn-sm {
            padding: 8px 18px;
            font-size: 13px;
        }

        .hamburger {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
        }

        .hamburger span {
            width: 22px;
            height: 2px;
            background: var(--text);
            border-radius: 2px;
            transition: var(--transition);
        }

        .mobile-menu {
            display: none;
            flex-direction: column;
            padding: 16px 24px 24px;
            background: var(--white);
            border-top: 1px solid var(--border);
        }

        .mobile-menu.open {
            display: flex;
        }

        .mobile-menu a {
            padding: 12px 0;
            color: var(--text);
            font-weight: 500;
            border-bottom: 1px solid var(--border);
            font-size: 15px;
        }

        .mobile-menu a:last-of-type {
            border-bottom: none;
        }

        .mobile-menu a.active {
            color: var(--primary);
        }

        .mobile-search {
            margin: 12px 0;
        }

        .mobile-search input {
            width: 100%;
            height: 40px;
            border: 1px solid var(--border);
            border-radius: 20px;
            padding: 0 16px;
            font-size: 14px;
            background: var(--bg);
        }

        /* ===== Page Hero ===== */
        .page-hero {
            position: relative;
            padding: 80px 0 64px;
            background: var(--dark-bg);
            overflow: hidden;
        }

        .hero-bg {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            opacity: 0.35;
        }

        .hero-bg::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11, 30, 58, 0.92), rgba(37, 99, 235, 0.65));
        }

        .page-hero .grid-container {
            position: relative;
            z-index: 2;
        }

        .breadcrumb {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 24px;
        }

        .breadcrumb a {
            color: rgba(255, 255, 255, 0.9);
        }

        .breadcrumb a:hover {
            color: #fff;
        }

        .breadcrumb span {
            color: rgba(255, 255, 255, 0.6);
        }

        .page-hero h1 {
            color: #fff;
            font-size: clamp(32px, 5vw, 48px);
            font-weight: 700;
            margin-bottom: 16px;
            line-height: 1.2;
        }

        .hero-sub {
            color: rgba(255, 255, 255, 0.85);
            font-size: 17px;
            line-height: 1.7;
            max-width: 640px;
        }

        /* ===== TOC Cards ===== */
        .toc-cards {
            padding: 48px 0;
        }

        .toc-card {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 10px;
            background: var(--white);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 32px 16px;
            text-align: center;
            transition: var(--transition);
            box-shadow: var(--shadow);
            height: 100%;
        }

        .toc-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--primary);
        }

        .toc-num {
            font-size: 28px;
            font-weight: 800;
            color: var(--primary);
            opacity: 0.2;
            transition: var(--transition);
        }

        .toc-card:hover .toc-num {
            opacity: 0.8;
        }

        .toc-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
        }

        /* ===== Tutorial Steps ===== */
        .tutorial-steps {
            padding: 48px 0 64px;
            background: var(--white);
        }

        .tutorial-row {
            padding: 48px 0;
            border-bottom: 1px solid var(--border);
        }

        .tutorial-row:last-child {
            border-bottom: none;
        }

        .step-badge {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 20px;
            margin-bottom: 16px;
        }

        .tutorial-row h2 {
            font-size: clamp(22px, 3vw, 28px);
            font-weight: 700;
            margin-bottom: 16px;
            line-height: 1.3;
        }

        .tutorial-row p {
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.8;
            margin-bottom: 16px;
        }

        .step-list {
            list-style: none;
        }

        .step-list li {
            position: relative;
            padding-left: 28px;
            padding-bottom: 12px;
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.7;
        }

        .step-list li::before {
            content: '✓';
            position: absolute;
            left: 0;
            top: 0;
            width: 20px;
            height: 20px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 50%;
            font-size: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
        }

        .tutorial-row .cell img {
            border-radius: var(--radius);
            box-shadow: var(--shadow-hover);
            width: 100%;
            aspect-ratio: 4 / 3;
            object-fit: cover;
            border: 1px solid var(--border);
        }

        /* ===== Visual Guide ===== */
        .visual-guide {
            padding: 64px 0;
            background: var(--bg);
        }

        .visual-guide h2,
        .tips-section h2,
        .faq-section h2 {
            font-size: clamp(24px, 3.5vw, 34px);
            font-weight: 700;
            margin-bottom: 16px;
            text-align: center;
            position: relative;
        }

        .visual-guide h2::after,
        .tips-section h2::after,
        .faq-section h2::after {
            content: '';
            display: block;
            width: 40px;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
            margin: 12px auto 0;
        }

        .visual-guide .section-sub {
            text-align: center;
            color: var(--text-secondary);
            font-size: 15px;
            max-width: 640px;
            margin: 0 auto;
        }

        .visual-card {
            background: var(--white);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            padding: 24px;
            margin-top: 32px;
        }

        .visual-card img {
            border-radius: var(--radius-sm);
            width: 100%;
            border: 1px solid var(--border);
        }

        .visual-notes {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
            margin-top: 20px;
        }

        .visual-note {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            background: var(--bg);
            border-radius: var(--radius-sm);
            padding: 16px;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .visual-note i {
            color: var(--primary);
            margin-top: 3px;
            font-size: 16px;
        }

        /* ===== Tips ===== */
        .tips-section {
            padding: 64px 0;
            background: var(--white);
        }

        .tips-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 32px;
        }

        .tip-card {
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 24px;
            transition: var(--transition);
        }

        .tip-card:hover {
            background: var(--primary-light);
            border-color: var(--primary);
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }

        .tip-card i {
            font-size: 24px;
            color: var(--primary);
            margin-bottom: 12px;
        }

        .tip-card h3 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 6px;
            color: var(--text);
        }

        .tip-card p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== FAQ ===== */
        .faq-section {
            padding: 64px 0;
            background: var(--bg);
        }

        .faq-list {
            max-width: 800px;
            margin: 32px auto 0;
        }

        .faq-item {
            background: var(--white);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            margin-bottom: 12px;
            overflow: hidden;
            box-shadow: 0 2px 8px rgba(18, 52, 96, 0.05);
            transition: var(--transition);
        }

        .faq-item:hover {
            border-color: var(--primary);
        }

        .faq-question {
            width: 100%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 24px;
            background: none;
            border: none;
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
            cursor: pointer;
            text-align: left;
            transition: var(--transition);
            font-family: var(--font-family);
        }

        .faq-question:hover {
            color: var(--primary);
        }

        .faq-icon {
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--primary-light);
            position: relative;
            flex-shrink: 0;
            transition: var(--transition);
        }

        .faq-icon::before,
        .faq-icon::after {
            content: '';
            position: absolute;
            background: var(--primary);
            border-radius: 2px;
            transition: var(--transition);
        }

        .faq-icon::before {
            width: 2px;
            height: 10px;
            left: 11px;
            top: 7px;
        }

        .faq-icon::after {
            width: 10px;
            height: 2px;
            left: 7px;
            top: 11px;
        }

        .faq-item.open .faq-icon {
            background: var(--primary);
        }

        .faq-item.open .faq-icon::before {
            background: #fff;
            transform: rotate(90deg);
            opacity: 0;
        }

        .faq-item.open .faq-icon::after {
            background: #fff;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .faq-answer p {
            padding: 0 24px 20px;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ===== Download CTA ===== */
        .download-cta {
            background: var(--dark-bg);
            padding: 72px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .download-cta::before {
            content: '';
            position: absolute;
            top: -80px;
            right: -80px;
            width: 240px;
            height: 240px;
            background: radial-gradient(circle, rgba(37, 99, 235, 0.4), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .download-cta::after {
            content: '';
            position: absolute;
            bottom: -60px;
            left: -60px;
            width: 180px;
            height: 180px;
            background: radial-gradient(circle, rgba(14, 165, 233, 0.3), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .download-cta .grid-container {
            position: relative;
            z-index: 2;
        }

        .download-cta h2 {
            color: #fff;
            font-size: clamp(24px, 4vw, 36px);
            font-weight: 700;
            margin-bottom: 16px;
        }

        .download-cta .cta-desc {
            color: rgba(255, 255, 255, 0.8);
            font-size: 16px;
            margin-bottom: 32px;
        }

        .cta-buttons {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 20px;
        }

        .btn-download {
            display: inline-flex;
            flex-direction: column;
            align-items: center;
            gap: 4px;
            background: #fff;
            color: var(--text);
            border-radius: var(--radius-sm);
            padding: 16px 32px;
            font-size: 15px;
            font-weight: 600;
            transition: var(--transition);
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
            min-width: 140px;
        }

        .btn-download i {
            font-size: 22px;
            color: var(--primary);
        }

        .btn-download:hover {
            transform: translateY(-4px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.4);
            color: var(--primary);
        }

        .btn-download.btn-outline {
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.5);
            color: #fff;
        }

        .btn-download.btn-outline i {
            color: #fff;
        }

        .btn-download.btn-outline:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
            color: #fff;
        }

        .cta-note {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.5);
            margin-top: 16px;
        }

        .cta-back {
            margin-top: 24px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: rgba(255, 255, 255, 0.6);
            font-size: 14px;
        }

        .cta-back:hover {
            color: #fff;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--dark-bg);
            color: rgba(255, 255, 255, 0.7);
            padding: 48px 0 0;
            border-top: 4px solid var(--primary);
        }

        .footer-top {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
        }

        .footer-brand .brand-icon {
            width: 32px;
            height: 32px;
            background: var(--primary);
            border-radius: 8px;
            color: #fff;
            font-weight: 700;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 8px;
            font-size: 14px;
        }

        .footer-brand .brand-text {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            margin-left: 8px;
        }

        .footer-brand p {
            font-size: 13px;
            line-height: 1.6;
            margin-top: 12px;
            color: rgba(255, 255, 255, 0.55);
            max-width: 260px;
        }

        .footer-col h4 {
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .footer-col a {
            display: block;
            color: rgba(255, 255, 255, 0.6);
            font-size: 13px;
            padding: 4px 0;
        }

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

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding: 20px 0;
            display: flex;
            justify-content: space-between;
            font-size: 12px;
            color: rgba(255, 255, 255, 0.4);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .main-nav {
                gap: 16px;
            }

            .search-box input {
                width: 140px;
            }

            .footer-top {
                grid-template-columns: 1fr 1fr;
            }

            .tips-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .header-right .search-box,
            .header-right .ghost-btn,
            .header-right .btn-primary {
                display: none;
            }

            .hamburger {
                display: flex;
            }

            .main-nav {
                display: none;
            }

            .mobile-menu.open {
                display: flex;
            }

            .page-hero {
                padding: 40px 0;
            }

            .page-hero h1 {
                font-size: 30px;
            }

            .hero-sub {
                font-size: 15px;
            }

            .tutorial-row {
                padding: 32px 0;
            }

            .tutorial-row .cell:last-child {
                margin-top: 24px;
            }

            .visual-notes {
                grid-template-columns: 1fr;
            }

            .tips-grid {
                grid-template-columns: 1fr 1fr;
            }

            .footer-top {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .footer-bottom {
                flex-direction: column;
                gap: 6px;
                text-align: center;
            }

            .cta-buttons {
                flex-direction: column;
                align-items: center;
            }

            .btn-download {
                width: 100%;
                max-width: 280px;
            }

            .toc-cards .cell {
                margin-bottom: 12px;
            }
        }

        @media (max-width: 520px) {
            .tips-grid {
                grid-template-columns: 1fr;
            }

            .brand-text {
                font-size: 18px;
            }

            .page-hero h1 {
                font-size: 26px;
            }

            .btn-primary {
                text-align: center;
            }
        }

/* roulang page: category2 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2563EB;
            --primary-dark: #1D4ED8;
            --primary-darker: #1E40AF;
            --primary-light: #EFF6FF;
            --accent: #0EA5E9;
            --bg: #F4F7FB;
            --bg-deep: #EAF1F8;
            --white: #FFFFFF;
            --text: #182A3D;
            --text-secondary: #546E7A;
            --text-muted: #90A4AE;
            --border: #DEE7F0;
            --dark: #0B1E3A;
            --success: #16A34A;
            --radius: 12px;
            --radius-sm: 8px;
            --shadow: 0 4px 16px rgba(22, 80, 160, 0.08);
            --shadow-hover: 0 8px 24px rgba(22, 80, 160, 0.14);
            --transition: all 0.3s ease;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.75;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            height: auto;
        }
        a {
            text-decoration: none;
            color: var(--primary);
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        ul {
            list-style: none;
        }
        button {
            border: none;
            cursor: pointer;
            font-family: inherit;
            font-size: inherit;
        }
        input {
            font-family: inherit;
        }

        /* ===== 导航 ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: var(--white);
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
            height: 64px;
        }
        .header-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            height: 100%;
            gap: 32px;
        }
        .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .brand-icon {
            width: 32px;
            height: 32px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--white);
            font-weight: 700;
            font-size: 13px;
            letter-spacing: 0.5px;
        }
        .brand-text {
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
        }
        .main-nav {
            display: flex;
            gap: 28px;
            flex: 1;
        }
        .main-nav a {
            color: var(--text-secondary);
            font-size: 15px;
            padding: 6px 0;
            position: relative;
            font-weight: 400;
        }
        .main-nav a:hover {
            color: var(--text);
        }
        .main-nav a.active {
            color: var(--primary);
            font-weight: 600;
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .search-box {
            position: relative;
        }
        .search-box input {
            border: 1px solid var(--border);
            border-radius: 20px;
            padding: 6px 14px 6px 34px;
            font-size: 13px;
            width: 170px;
            background: var(--bg);
            transition: var(--transition);
        }
        .search-box input:focus {
            outline: none;
            width: 210px;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
            background: var(--white);
        }
        .search-box i {
            position: absolute;
            left: 12px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 13px;
            color: var(--text-muted);
        }
        .btn-login {
            background: none;
            color: var(--primary);
            font-size: 14px;
            font-weight: 500;
            padding: 6px 12px;
            border-radius: 6px;
            transition: var(--transition);
        }
        .btn-login:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
        }
        .btn-primary {
            background: var(--primary);
            color: var(--white);
            padding: 10px 24px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 600;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            color: var(--white);
            box-shadow: 0 6px 16px rgba(37, 99, 235, 0.3);
        }
        .btn-primary:active {
            background: var(--primary-darker);
            transform: translateY(0);
        }
        .btn-primary:focus {
            outline: none;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.35);
        }
        .hamburger {
            display: none;
            background: none;
            font-size: 22px;
            color: var(--text);
            padding: 6px;
        }

        /* 移动端导航面板 */
        .mobile-menu {
            display: none;
            position: fixed;
            top: 64px;
            left: 0;
            right: 0;
            background: var(--white);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
            padding: 20px 24px;
            z-index: 99;
            border-top: 1px solid var(--border);
        }
        .mobile-menu.open {
            display: block;
        }
        .mobile-menu a {
            display: block;
            padding: 12px 0;
            color: var(--text);
            font-size: 16px;
            border-bottom: 1px solid #F0F4F9;
        }
        .mobile-menu a.active {
            color: var(--primary);
            font-weight: 600;
        }
        .mobile-menu a:last-child {
            border-bottom: none;
        }
        .mobile-menu .mobile-actions {
            display: flex;
            gap: 12px;
            margin-top: 16px;
            flex-direction: column;
        }
        .mobile-menu .mobile-actions .btn-primary {
            justify-content: center;
        }

        /* ===== Hero ===== */
        .feature-hero {
            background: var(--bg) url('/assets/images/backpic/back-1.webp') no-repeat center center / cover;
            position: relative;
            padding: 90px 0;
        }
        .feature-hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.94) 40%, rgba(244, 247, 251, 0.75));
            z-index: 1;
        }
        .feature-hero .grid-container {
            position: relative;
            z-index: 2;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(37, 99, 235, 0.08);
            border: 1px solid rgba(37, 99, 235, 0.2);
            border-radius: 20px;
            padding: 4px 14px;
            font-size: 13px;
            color: var(--primary);
            font-weight: 500;
            margin-bottom: 20px;
        }
        .hero-title {
            font-size: clamp(32px, 5vw, 46px);
            font-weight: 700;
            line-height: 1.2;
            color: var(--text);
            margin-bottom: 16px;
        }
        .hero-title span {
            color: var(--primary);
        }
        .hero-subtitle {
            font-size: 17px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 28px;
            max-width: 480px;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn-secondary {
            background: transparent;
            border: 1.5px solid var(--primary);
            color: var(--primary);
            padding: 10px 24px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 600;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .btn-secondary:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
            transform: translateY(-2px);
        }
        .btn-secondary:focus {
            outline: none;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
        }
        .hero-meta {
            margin-top: 18px;
            font-size: 13px;
            color: var(--text-muted);
        }
        .hero-meta i {
            color: var(--success);
            margin-right: 4px;
        }
        .hero-visual {
            text-align: center;
            position: relative;
        }
        .hero-visual .browser-window {
            background: var(--white);
            border-radius: 16px;
            box-shadow: 0 20px 50px rgba(22, 80, 160, 0.15);
            border: 1px solid var(--border);
            overflow: hidden;
            display: inline-block;
            max-width: 100%;
            text-align: left;
        }
        .browser-bar {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 12px 16px;
            background: #FAFCFF;
            border-bottom: 1px solid var(--border);
        }
        .browser-bar span {
            width: 10px;
            height: 10px;
            border-radius: 50%;
        }
        .browser-bar span:nth-child(1) { background: #FF5F57; }
        .browser-bar span:nth-child(2) { background: #FEBC2E; }
        .browser-bar span:nth-child(3) { background: #28C840; }
        .browser-bar .bar-url {
            margin-left: 10px;
            font-size: 12px;
            color: var(--text-muted);
            background: var(--bg);
            padding: 3px 12px;
            border-radius: 10px;
            flex: 1;
        }
        .hero-visual img {
            width: 100%;
            height: auto;
            display: block;
        }
        .float-icon {
            position: absolute;
            width: 48px;
            height: 48px;
            background: var(--white);
            border-radius: 12px;
            box-shadow: var(--shadow);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 20px;
            animation: float 3s ease-in-out infinite;
        }
        .float-icon.fi-1 {
            top: 20px;
            right: -10px;
            animation-delay: 0s;
        }
        .float-icon.fi-2 {
            bottom: 30px;
            left: -12px;
            animation-delay: 1.5s;
            color: var(--accent);
        }
        @keyframes float {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-8px); }
        }

        /* ===== 指标带 ===== */
        .metrics-band {
            background: var(--white);
            padding: 50px 0;
            border-bottom: 1px solid var(--border);
        }
        .metric-item {
            text-align: center;
            padding: 20px;
        }
        .metric-num {
            font-size: 38px;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.2;
            margin-bottom: 4px;
        }
        .metric-label {
            font-size: 14px;
            color: var(--text-secondary);
        }

        /* ===== 核心功能 ===== */
        .core-features {
            padding: 90px 0;
            background: var(--bg);
        }
        .section-header {
            text-align: center;
            margin-bottom: 60px;
        }
        .section-header h2 {
            font-size: clamp(24px, 3.5vw, 34px);
            font-weight: 700;
            color: var(--text);
            line-height: 1.3;
            margin-bottom: 12px;
        }
        .section-header h2::after {
            content: '';
            display: block;
            width: 48px;
            height: 3px;
            background: var(--primary);
            border-radius: 3px;
            margin: 16px auto 0;
        }
        .section-header p {
            color: var(--text-secondary);
            font-size: 16px;
            max-width: 640px;
            margin: 0 auto;
            margin-top: 14px;
        }
        .feature-block {
            display: flex;
            align-items: center;
            gap: 60px;
            margin-bottom: 80px;
        }
        .feature-block:nth-child(even) {
            flex-direction: row-reverse;
        }
        .feature-block:last-child {
            margin-bottom: 0;
        }
        .feature-text {
            flex: 1;
        }
        .feature-text .feat-icon {
            width: 56px;
            height: 56px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--white);
            font-size: 24px;
            margin-bottom: 20px;
            box-shadow: 0 8px 20px rgba(37, 99, 235, 0.25);
        }
        .feature-text h3 {
            font-size: 24px;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 12px;
        }
        .feature-text p {
            color: var(--text-secondary);
            font-size: 16px;
            line-height: 1.7;
            margin-bottom: 16px;
        }
        .feature-text ul {
            margin-top: 8px;
        }
        .feature-text ul li {
            position: relative;
            padding-left: 24px;
            margin-bottom: 8px;
            color: var(--text-secondary);
            font-size: 15px;
        }
        .feature-text ul li::before {
            content: '\f00c';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            position: absolute;
            left: 0;
            color: var(--success);
            font-size: 13px;
        }
        .feature-visual {
            flex: 1;
            text-align: center;
        }
        .feature-visual img {
            border-radius: 16px;
            box-shadow: var(--shadow-hover);
            max-height: 340px;
            object-fit: cover;
            width: 100%;
        }

        /* ===== 功能矩阵 ===== */
        .feature-matrix {
            padding: 90px 0;
            background: var(--bg-deep);
        }
        .matrix-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .matrix-card {
            background: var(--white);
            border-radius: var(--radius);
            padding: 28px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .matrix-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .matrix-card .mc-icon {
            width: 46px;
            height: 46px;
            border-radius: 12px;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            margin-bottom: 16px;
        }
        .matrix-card h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 8px;
        }
        .matrix-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        /* ===== 适用场景 ===== */
        .use-cases {
            padding: 90px 0;
            background: var(--dark);
            position: relative;
            overflow: hidden;
        }
        .use-cases::before {
            content: '';
            position: absolute;
            top: -100px;
            right: -100px;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(37, 99, 235, 0.2), transparent 70%);
        }
        .use-cases .section-header h2 {
            color: var(--white);
        }
        .use-cases .section-header p {
            color: rgba(255, 255, 255, 0.6);
        }
        .use-cases .section-header h2::after {
            background: var(--accent);
        }
        .scene-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
            z-index: 2;
        }
        .scene-card {
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: var(--radius);
            padding: 28px 24px;
            transition: var(--transition);
            backdrop-filter: blur(10px);
        }
        .scene-card:hover {
            background: rgba(255, 255, 255, 0.14);
            border-color: rgba(255, 255, 255, 0.2);
            transform: translateY(-4px);
        }
        .scene-card .sc-icon {
            font-size: 30px;
            margin-bottom: 14px;
            color: var(--accent);
        }
        .scene-card h3 {
            color: var(--white);
            font-size: 18px;
            margin-bottom: 8px;
        }
        .scene-card p {
            color: rgba(255, 255, 255, 0.7);
            font-size: 14px;
            line-height: 1.65;
        }

        /* ===== FAQ ===== */
        .faq-section {
            padding: 90px 0;
            background: var(--bg);
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--white);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            margin-bottom: 14px;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-hover);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            cursor: pointer;
            background: none;
            text-align: left;
            width: 100%;
        }
        .faq-question h3 {
            font-size: 16px;
            font-weight: 500;
            color: var(--text);
            flex: 1;
        }
        .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            transition: transform 0.3s ease;
            flex-shrink: 0;
            margin-left: 16px;
        }
        .faq-item.active .faq-icon {
            transform: rotate(45deg);
            background: var(--primary);
            color: var(--white);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
        }
        .faq-answer-inner {
            padding: 0 24px 20px;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.75;
            border-top: 1px solid #F0F4F9;
            padding-top: 16px;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 90px 0;
            background: var(--dark);
            position: relative;
            text-align: center;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(11, 30, 58, 0.88);
        }
        .cta-content {
            position: relative;
            z-index: 2;
        }
        .cta-content h2 {
            color: var(--white);
            font-size: clamp(24px, 3.5vw, 34px);
            font-weight: 700;
            margin-bottom: 12px;
        }
        .cta-content p {
            color: rgba(255, 255, 255, 0.75);
            font-size: 16px;
            margin-bottom: 32px;
        }
        .cta-buttons {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .btn-download {
            background: var(--primary);
            color: var(--white);
            padding: 16px 40px;
            border-radius: 10px;
            font-size: 18px;
            font-weight: 600;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 10px;
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35);
        }
        .btn-download:hover {
            background: var(--accent);
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(14, 165, 233, 0.4);
            color: var(--white);
        }
        .btn-outline-light {
            background: transparent;
            border: 1.5px solid rgba(255, 255, 255, 0.6);
            color: var(--white);
            padding: 16px 32px;
            border-radius: 10px;
            font-size: 16px;
            font-weight: 500;
            transition: var(--transition);
        }
        .btn-outline-light:hover {
            border-color: var(--white);
            background: rgba(255, 255, 255, 0.1);
            color: var(--white);
        }
        .cta-tip {
            margin-top: 16px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.5);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--dark);
            padding: 60px 0 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }
        .footer-top {
            display: flex;
            gap: 40px;
            flex-wrap: wrap;
            margin-bottom: 40px;
        }
        .footer-brand {
            flex: 1.4;
            min-width: 240px;
        }
        .footer-brand .brand-icon {
            margin-bottom: 12px;
        }
        .footer-brand .brand-text {
            color: var(--white);
            font-size: 18px;
            font-weight: 700;
            margin-left: 8px;
        }
        .footer-brand p {
            color: rgba(255, 255, 255, 0.5);
            font-size: 14px;
            line-height: 1.7;
            margin-top: 12px;
            max-width: 280px;
        }
        .footer-col {
            flex: 1;
            min-width: 120px;
        }
        .footer-col h4 {
            color: var(--white);
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .footer-col a {
            display: block;
            color: rgba(255, 255, 255, 0.5);
            font-size: 14px;
            margin-bottom: 10px;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom p {
            color: rgba(255, 255, 255, 0.35);
            font-size: 12px;
            margin: 0;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .matrix-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .scene-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .feature-block,
            .feature-block:nth-child(even) {
                flex-direction: column;
                gap: 32px;
            }
            .feature-visual {
                text-align: center;
            }
            .feature-visual img {
                max-width: 100%;
            }
        }

        @media (max-width: 768px) {
            .header-inner {
                padding: 0 16px;
                gap: 16px;
            }
            .main-nav {
                display: none;
            }
            .header-actions .search-box,
            .header-actions .btn-login {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .feature-hero {
                padding: 60px 0;
            }
            .hero-title {
                font-size: 30px;
            }
            .hero-actions {
                flex-direction: column;
                width: 100%;
            }
            .hero-actions .btn-primary,
            .hero-actions .btn-secondary {
                width: 100%;
                justify-content: center;
            }
            .metrics-band {
                padding: 30px 0;
            }
            .metric-num {
                font-size: 30px;
            }
            .core-features {
                padding: 60px 0;
            }
            .feature-matrix {
                padding: 60px 0;
            }
            .use-cases {
                padding: 60px 0;
            }
            .faq-section {
                padding: 60px 0;
            }
            .cta-section {
                padding: 60px 0;
            }
            .cta-buttons {
                flex-direction: column;
                align-items: center;
            }
            .btn-download,
            .btn-outline-light {
                width: 100%;
                justify-content: center;
            }
            .footer-top {
                flex-direction: column;
                gap: 32px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .matrix-grid,
            .scene-grid {
                grid-template-columns: 1fr;
            }
            .header-inner {
                gap: 8px;
            }
            .brand-text {
                font-size: 16px;
            }
            .btn-primary {
                padding: 8px 16px;
                font-size: 13px;
            }
            .feature-text h3 {
                font-size: 20px;
            }
            .section-header p {
                font-size: 14px;
            }
        }

        /* 访问性 */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }
        .skip-link {
            position: absolute;
            top: -40px;
            left: 0;
            background: var(--primary);
            color: var(--white);
            padding: 8px 16px;
            z-index: 999;
            transition: top 0.2s;
        }
        .skip-link:focus {
            top: 0;
        }