/* roulang page: index */
:root {
            --color-primary: #0FAF9A;
            --color-primary-light: #2EE6C7;
            --color-primary-dark: #0B7E72;
            --color-accent: #FF8A3D;
            --color-accent-light: #FFA266;
            --color-bg: #0B1519;
            --color-bg-alt: #101E24;
            --color-card: rgba(255, 255, 255, 0.04);
            --color-border: rgba(255, 255, 255, 0.08);
            --color-border-hover: rgba(47, 230, 199, 0.6);
            --color-text: #F2F7F6;
            --color-text-sub: #A7B8B5;
            --color-text-weak: #6B837E;
            --color-success: #54E3A8;
            --color-warning: #FFD166;
            --gradient-brand: linear-gradient(135deg, #0FAF9A 0%, #2EE6C7 100%);
            --gradient-accent: linear-gradient(135deg, #FF8A3D, #FFA266);
            --radius-xl: 20px;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --shadow-card: 0 12px 40px rgba(0, 0, 0, 0.25);
            --shadow-card-hover: 0 16px 48px rgba(0, 0, 0, 0.35);
            --space-section: 80px;
            --space-section-mobile: 48px;
            --container-width: 1200px;
            --font-title: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
            --font-body: system-ui, "Microsoft YaHei", "PingFang SC", sans-serif;
            --font-mono: "JetBrains Mono", "SF Mono", Consolas, monospace;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-body);
            font-size: 16px;
            line-height: 1.7;
            background-color: var(--color-bg);
            color: var(--color-text);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            color: var(--color-primary-light);
            text-decoration: none;
            transition: color 0.25s ease;
        }
        a:hover {
            color: var(--color-primary-light);
        }
        button {
            font-family: inherit;
            border: none;
            background: none;
            cursor: pointer;
        }
        input,
        textarea {
            font-family: inherit;
            font-size: 16px;
        }
        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .section {
            padding: var(--space-section) 0;
        }
        .section-alt {
            background-color: var(--color-bg-alt);
        }
        .section-title {
            font-family: var(--font-title);
            font-size: 30px;
            font-weight: 800;
            line-height: 1.3;
            color: var(--color-text);
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }
        .section-sub {
            font-size: 16px;
            color: var(--color-text-sub);
            margin-bottom: 40px;
            line-height: 1.65;
        }
        .text-center {
            text-align: center;
        }
        .gradient-text {
            background: var(--gradient-brand);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            color: transparent;
        }
        /* ============ Buttons ============ */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 44px;
            padding: 0 24px;
            border-radius: var(--radius-md);
            font-size: 15px;
            font-weight: 600;
            line-height: 1;
            transition: all 0.25s ease;
            white-space: nowrap;
        }
        .btn:focus {
            outline: 3px solid rgba(255, 138, 61, 0.35);
            outline-offset: 2px;
        }
        .btn-primary {
            background: var(--gradient-accent);
            color: #141414;
            border: none;
        }
        .btn-primary:hover {
            background: linear-gradient(135deg, #ff9a52, #ffb07c);
            color: #141414;
            box-shadow: 0 8px 30px rgba(255, 138, 61, 0.35);
            transform: translateY(-2px);
        }
        .btn-primary:active {
            transform: scale(0.98);
        }
        .btn-outline {
            background: transparent;
            border: 1px solid var(--color-primary);
            color: var(--color-primary-light);
        }
        .btn-outline:hover {
            background: rgba(15, 175, 154, 0.1);
            color: var(--color-primary-light);
            border-color: var(--color-primary-light);
        }
        .btn-outline:active {
            transform: scale(0.98);
        }
        .btn-sm {
            height: 38px;
            padding: 0 18px;
            font-size: 14px;
            border-radius: 10px;
        }
        .btn-lg {
            height: 52px;
            padding: 0 28px;
            font-size: 16px;
            border-radius: 14px;
        }
        .btn-xl {
            height: 56px;
            min-width: 240px;
            padding: 0 36px;
            font-size: 17px;
            border-radius: 14px;
        }
        /* ============ Header & Nav ============ */
        .site-header {
            position: fixed;
            top: 16px;
            left: 0;
            right: 0;
            z-index: 1000;
            padding: 0 24px;
        }
        .header-inner {
            max-width: var(--container-width);
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 10px 18px;
            background: rgba(13, 22, 28, 0.85);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 38px;
            height: 38px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 10px;
            background: var(--gradient-brand);
            color: #062823;
            font-size: 18px;
            box-shadow: 0 4px 14px rgba(15, 175, 154, 0.3);
        }
        .logo-text {
            font-family: var(--font-title);
            font-size: 20px;
            font-weight: 800;
            color: var(--color-text);
            letter-spacing: 1px;
        }
        .logo-text:hover {
            color: var(--color-primary-light);
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 8px;
            flex: 1;
            justify-content: center;
        }
        .nav-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 9px 18px;
            border-radius: var(--radius-md);
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid transparent;
            color: var(--color-text-sub);
            font-size: 14px;
            font-weight: 500;
            transition: all 0.25s ease;
        }
        .nav-link .nav-icon {
            font-size: 15px;
            opacity: 0.85;
        }
        .nav-link:hover {
            background: rgba(15, 175, 154, 0.15);
            border-color: var(--color-primary);
            color: var(--color-text);
        }
        .nav-link.active {
            background: rgba(15, 175, 154, 0.2);
            border-color: var(--color-primary);
            color: var(--color-text);
            font-weight: 600;
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: 8px;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--color-border);
        }
        .nav-toggle span {
            width: 18px;
            height: 2px;
            background: var(--color-text);
            border-radius: 2px;
            transition: all 0.3s ease;
        }
        /* ============ Hero ============ */
        .hero {
            position: relative;
            padding: 150px 0 80px;
            background-color: var(--color-bg);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(11, 21, 25, 0.9) 0%, rgba(11, 21, 25, 0.96) 100%);
            z-index: 1;
        }
        .hero::after {
            content: '';
            position: absolute;
            top: -80px;
            right: -80px;
            width: 480px;
            height: 480px;
            background: radial-gradient(circle, rgba(15, 175, 154, 0.2) 0%, transparent 70%);
            pointer-events: none;
            z-index: 1;
        }
        .hero .container {
            position: relative;
            z-index: 2;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 60px;
            align-items: center;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 16px;
            border-radius: 100px;
            background: rgba(15, 175, 154, 0.15);
            border: 1px solid rgba(15, 175, 154, 0.35);
            color: var(--color-primary-light);
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 22px;
            letter-spacing: 0.5px;
        }
        .hero-title {
            font-family: var(--font-title);
            font-size: 42px;
            font-weight: 800;
            line-height: 1.25;
            color: var(--color-text);
            margin-bottom: 18px;
            letter-spacing: 0.5px;
        }
        .hero-desc {
            font-size: 18px;
            color: var(--color-text-sub);
            line-height: 1.7;
            max-width: 520px;
            margin-bottom: 30px;
        }
        .hero-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 42px;
        }
        .hero-stats {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 12px;
        }
        .stat-item {
            padding: 18px 16px;
            border-radius: var(--radius-lg);
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--color-border);
            text-align: center;
            transition: border-color 0.25s ease;
        }
        .stat-item:hover {
            border-color: var(--color-border-hover);
        }
        .stat-number {
            font-family: var(--font-mono);
            font-size: 28px;
            font-weight: 700;
            background: var(--gradient-brand);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            display: block;
            line-height: 1.2;
            margin-bottom: 4px;
        }
        .stat-label {
            font-size: 13px;
            color: var(--color-text-weak);
        }
        .hero-visual {
            position: relative;
        }
        .hero-img-card {
            position: relative;
            border-radius: var(--radius-xl);
            overflow: hidden;
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-card);
            background: rgba(255, 255, 255, 0.03);
        }
        .hero-img-card img {
            width: 100%;
            height: auto;
            min-height: 320px;
            object-fit: cover;
        }
        .hero-img-shade {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 45%;
            background: linear-gradient(180deg, transparent, rgba(11, 21, 25, 0.85));
            pointer-events: none;
        }
        /* ============ Showcase Carousel ============ */
        .showcase {
            background-color: var(--color-bg-alt);
        }
        .carousel-wrap {
            position: relative;
        }
        .carousel-viewport {
            overflow: hidden;
            border-radius: var(--radius-xl);
        }
        .carousel-track {
            display: flex;
            transition: transform 0.45s ease;
        }
        .carousel-slide {
            min-width: 100%;
            padding: 12px;
        }
        .slide-card {
            border-radius: var(--radius-xl);
            overflow: hidden;
            background: var(--color-card);
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-card);
        }
        .slide-card img {
            width: 100%;
            height: auto;
            aspect-ratio: 16 / 9;
            object-fit: cover;
        }
        .slide-info {
            padding: 24px;
        }
        .slide-info h3 {
            font-family: var(--font-title);
            font-size: 20px;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 8px;
        }
        .slide-info p {
            font-size: 15px;
            color: var(--color-text-sub);
            line-height: 1.6;
        }
        .carousel-controls {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 20px;
            margin-top: 24px;
        }
        .carousel-arrow {
            width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid var(--color-border);
            color: var(--color-text-sub);
            font-size: 16px;
            transition: all 0.25s ease;
        }
        .carousel-arrow:hover {
            background: var(--color-primary);
            border-color: var(--color-primary);
            color: #062823;
        }
        .carousel-dots {
            display: flex;
            gap: 8px;
        }
        .carousel-dots .dot {
            width: 8px;
            height: 8px;
            border-radius: 100px;
            background: rgba(255, 255, 255, 0.2);
            transition: all 0.3s ease;
        }
        .carousel-dots .dot.active {
            width: 28px;
            background: var(--color-primary);
        }
        /* ============ System Requirements ============ */
        .req-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .req-card {
            padding: 28px 22px;
            border-radius: var(--radius-xl);
            background: var(--color-card);
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-card);
            text-align: center;
            transition: all 0.25s ease;
        }
        .req-card:hover {
            border-color: var(--color-border-hover);
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-4px);
        }
        .req-icon {
            width: 48px;
            height: 48px;
            margin: 0 auto 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 12px;
            background: rgba(15, 175, 154, 0.12);
            color: var(--color-primary-light);
            font-size: 22px;
        }
        .req-number {
            font-family: var(--font-mono);
            font-size: 32px;
            font-weight: 700;
            color: var(--color-text);
            line-height: 1.2;
            display: block;
            margin-bottom: 6px;
        }
        .req-label {
            font-size: 14px;
            color: var(--color-text-sub);
            line-height: 1.5;
        }
        .req-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 36px;
        }
        .tag-chip {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: 100px;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid var(--color-border);
            color: var(--color-text-sub);
            font-size: 14px;
            transition: all 0.25s ease;
        }
        .tag-chip:hover {
            background: rgba(15, 175, 154, 0.1);
            border-color: var(--color-primary);
            color: var(--color-text);
        }
        /* ============ Testimonials ============ */
        .review-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .review-card {
            position: relative;
            padding: 30px;
            border-radius: var(--radius-xl);
            background: var(--color-card);
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-card);
            transition: all 0.25s ease;
        }
        .review-card:hover {
            transform: translateY(-4px);
            border-color: var(--color-border-hover);
            box-shadow: var(--shadow-card-hover);
        }
        .review-card::before {
            content: '"';
            position: absolute;
            top: 14px;
            right: 22px;
            font-family: Georgia, serif;
            font-size: 70px;
            line-height: 1;
            color: rgba(255, 255, 255, 0.06);
        }
        .review-stars {
            color: var(--color-warning);
            font-size: 15px;
            margin-bottom: 16px;
            letter-spacing: 3px;
        }
        .review-text {
            font-size: 15px;
            color: var(--color-text-sub);
            line-height: 1.7;
            margin-bottom: 24px;
        }
        .review-footer {
            display: flex;
            align-items: center;
            gap: 14px;
        }
        .review-avatar {
            width: 46px;
            height: 46px;
            border-radius: 50%;
            background: var(--gradient-brand);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #062823;
            font-weight: 700;
            font-size: 18px;
            flex-shrink: 0;
        }
        .review-author {
            font-size: 15px;
            font-weight: 600;
            color: var(--color-text);
            line-height: 1.3;
        }
        .review-source {
            font-size: 13px;
            color: var(--color-text-weak);
        }
        /* ============ Download Zone ============ */
        .download-zone {
            background-color: var(--color-bg);
        }
        .download-panel {
            max-width: 860px;
            margin: 0 auto;
            padding: 56px 48px;
            border-radius: var(--radius-xl);
            background: var(--color-bg-alt);
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-card);
            text-align: center;
        }
        .download-version {
            font-size: 14px;
            color: var(--color-text-weak);
            font-family: var(--font-mono);
            margin-bottom: 36px;
        }
        .download-buttons {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 20px;
            margin-bottom: 36px;
        }
        .qr-card {
            width: 120px;
            padding: 14px 10px;
            border-radius: var(--radius-md);
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--color-border);
            text-align: center;
        }
        .qr-placeholder {
            width: 80px;
            height: 80px;
            margin: 0 auto 8px;
            border: 2px dashed rgba(255, 255, 255, 0.35);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-text-weak);
            font-size: 28px;
        }
        .qr-label {
            font-size: 12px;
            color: var(--color-text-sub);
        }
        .download-meta {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 18px;
            font-size: 13px;
            color: var(--color-text-weak);
            font-family: var(--font-mono);
            margin-top: 10px;
        }
        .download-meta span {
            padding: 4px 12px;
            background: rgba(255, 255, 255, 0.03);
            border-radius: 8px;
            border: 1px solid rgba(255, 255, 255, 0.05);
        }
        /* ============ News CMS ============ */
        .news-section {
            background-color: var(--color-bg-alt);
        }
        .news-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .news-card {
            display: flex;
            flex-direction: column;
            padding: 28px;
            border-radius: var(--radius-xl);
            background: var(--color-card);
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-card);
            transition: all 0.25s ease;
        }
        .news-card:hover {
            transform: translateY(-4px);
            border-color: var(--color-border-hover);
            box-shadow: var(--shadow-card-hover);
        }
        .news-card-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 14px;
        }
        .news-tag {
            display: inline-flex;
            padding: 4px 14px;
            border-radius: 100px;
            background: rgba(15, 175, 154, 0.14);
            border: 1px solid rgba(15, 175, 154, 0.3);
            color: var(--color-primary-light);
            font-size: 13px;
            font-weight: 500;
        }
        .news-date {
            font-size: 13px;
            color: var(--color-text-weak);
            font-family: var(--font-mono);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .news-title {
            font-family: var(--font-title);
            font-size: 18px;
            font-weight: 700;
            line-height: 1.4;
            margin-bottom: 10px;
        }
        .news-title a {
            color: var(--color-text);
        }
        .news-title a:hover {
            color: var(--color-primary-light);
        }
        .news-summary {
            font-size: 15px;
            color: var(--color-text-sub);
            line-height: 1.6;
            margin-bottom: 18px;
            flex: 1;
        }
        .news-more {
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding-top: 14px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .news-more a {
            font-size: 14px;
            font-weight: 500;
            color: var(--color-primary-light);
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: gap 0.25s ease;
        }
        .news-more a:hover {
            gap: 12px;
            color: var(--color-primary-light);
        }
        .news-empty {
            grid-column: 1 / -1;
            padding: 60px 24px;
            text-align: center;
            border-radius: var(--radius-xl);
            background: var(--color-card);
            border: 1px dashed var(--color-border);
        }
        .news-empty i {
            font-size: 52px;
            color: var(--color-text-weak);
            margin-bottom: 16px;
            display: block;
        }
        .news-empty p {
            font-size: 16px;
            color: var(--color-text-sub);
        }
        /* ============ FAQ ============ */
        .faq-list {
            max-width: 820px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .faq-item {
            border-radius: var(--radius-lg);
            background: var(--color-card);
            border: 1px solid var(--color-border);
            overflow: hidden;
            transition: all 0.25s ease;
        }
        .faq-item.open {
            border-color: var(--color-primary);
            background: rgba(255, 255, 255, 0.06);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 16px 24px;
            min-height: 52px;
            font-size: 16px;
            font-weight: 600;
            color: var(--color-text);
            text-align: left;
            transition: background 0.25s ease;
        }
        .faq-question:hover {
            background: rgba(15, 175, 154, 0.06);
        }
        .faq-question i {
            color: var(--color-text-weak);
            transition: transform 0.3s ease;
            font-size: 14px;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--color-primary-light);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
        }
        .faq-answer-inner {
            padding: 0 24px 18px;
            font-size: 15px;
            color: var(--color-text-sub);
            line-height: 1.7;
        }
        /* ============ CTA ============ */
        .cta {
            background-color: var(--color-bg);
            padding: 48px 0;
        }
        .cta-inner {
            max-width: 900px;
            margin: 0 auto;
            padding: 44px 48px;
            border-radius: var(--radius-xl);
            background: var(--gradient-brand);
            text-align: center;
            box-shadow: 0 20px 60px rgba(15, 175, 154, 0.25);
        }
        .cta-inner h2 {
            font-family: var(--font-title);
            font-size: 24px;
            font-weight: 800;
            color: #062823;
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }
        .cta-inner p {
            font-size: 15px;
            color: rgba(6, 40, 35, 0.8);
            margin-bottom: 24px;
            line-height: 1.6;
        }
        .cta .btn-primary {
            background: #141414;
            color: #fff;
        }
        .cta .btn-primary:hover {
            background: #1f1f1f;
            color: #fff;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
        }
        /* ============ Footer ============ */
        .site-footer {
            background-color: var(--color-bg);
            border-top: 1px solid var(--color-border);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .footer-logo .logo-icon {
            width: 34px;
            height: 34px;
            font-size: 16px;
            border-radius: 9px;
        }
        .footer-logo .logo-text {
            font-size: 18px;
        }
        .footer-desc {
            font-size: 14px;
            color: var(--color-text-sub);
            line-height: 1.65;
            max-width: 300px;
        }
        .footer-title {
            font-family: var(--font-title);
            font-size: 16px;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 18px;
        }
        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links a {
            color: var(--color-text-sub);
            font-size: 14px;
            transition: color 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .footer-links a:hover {
            color: var(--color-primary-light);
        }
        .footer-links a i {
            font-size: 12px;
            opacity: 0.7;
        }
        .footer-contact p {
            font-size: 14px;
            color: var(--color-text-sub);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-contact i {
            color: var(--color-primary);
            width: 18px;
        }
        .footer-bottom {
            border-top: 1px solid var(--color-border);
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 13px;
            color: var(--color-text-weak);
        }
        /* ============ Responsive ============ */
        @media screen and (max-width: 1024px) {
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .hero {
                padding: 140px 0 60px;
            }
            .hero-visual {
                order: -1;
            }
            .req-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .nav-menu .nav-link {
                padding: 8px 12px;
                font-size: 13px;
            }
        }
        @media screen and (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
            .section {
                padding: var(--space-section-mobile) 0;
            }
            .section-title {
                font-size: 22px;
            }
            .section-sub {
                font-size: 15px;
                margin-bottom: 28px;
            }
            .hero {
                padding: 120px 0 48px;
            }
            .hero-title {
                font-size: 28px;
            }
            .hero-desc {
                font-size: 16px;
            }
            .hero-stats {
                grid-template-columns: repeat(4, 1fr);
                gap: 8px;
            }
            .stat-item {
                padding: 12px 8px;
                border-radius: 12px;
            }
            .stat-number {
                font-size: 20px;
            }
            .stat-label {
                font-size: 11px;
            }
            .header-inner {
                padding: 8px 14px;
            }
            .nav-menu {
                display: none;
                position: absolute;
                top: calc(100% + 10px);
                left: 16px;
                right: 16px;
                flex-direction: column;
                padding: 16px;
                gap: 10px;
                background: rgba(13, 22, 28, 0.96);
                border: 1px solid var(--color-border);
                border-radius: var(--radius-lg);
                box-shadow: var(--shadow-card);
                z-index: 99;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-menu .nav-link {
                width: 100%;
                justify-content: flex-start;
            }
            .nav-toggle {
                display: flex;
            }
            .nav-actions .btn-sm {
                display: none;
            }
            .review-grid {
                grid-template-columns: 1fr;
            }
            .news-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .download-panel {
                padding: 36px 20px;
            }
            .download-buttons {
                flex-direction: column;
                align-items: center;
            }
            .btn-xl {
                width: 100%;
                min-width: 0;
            }
            .cta-inner {
                padding: 32px 20px;
            }
            .carousel-arrow {
                width: 38px;
                height: 38px;
            }
        }
        @media screen and (max-width: 520px) {
            .hero-stats {
                grid-template-columns: repeat(2, 1fr);
            }
            .req-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }
            .req-card {
                padding: 18px 14px;
            }
            .req-number {
                font-size: 24px;
            }
            .download-meta {
                flex-direction: column;
                gap: 8px;
            }
        }
        @media screen and (min-width: 769px) {
            .nav-toggle {
                display: none !important;
            }
            .nav-menu {
                display: flex !important;
            }
        }

/* roulang page: article */
:root {
            --primary: #0FAF9A;
            --primary-light: #2EE6C7;
            --primary-dark: #0B7E72;
            --accent: #FF8A3D;
            --accent-light: #FFA266;
            --bg: #0B1519;
            --bg-alt: #101E24;
            --card-bg: rgba(255, 255, 255, 0.04);
            --border: rgba(255, 255, 255, 0.08);
            --border-hover: rgba(47, 230, 199, 0.6);
            --text: #F2F7F6;
            --text-sub: #A7B8B5;
            --text-weak: #6B837E;
            --success: #54E3A8;
            --warning: #FFD166;
            --radius-card: 20px;
            --radius-btn: 12px;
            --radius-nav: 16px;
            --shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
            --container: 1200px;
            --grad-brand: linear-gradient(135deg, #0FAF9A 0%, #2EE6C7 100%);
            --grad-accent: linear-gradient(135deg, #FF8A3D, #FFA266);
            --font-main: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
            --font-body: system-ui, "Microsoft YaHei", "PingFang SC", sans-serif;
            --font-mono: "JetBrains Mono", Consolas, monospace;
        }

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

        body {
            font-family: var(--font-body);
            background: var(--bg);
            background-image: radial-gradient(circle at 85% 15%, rgba(15, 175, 154, 0.08), transparent 40%), radial-gradient(circle at 10% 85%, rgba(255, 138, 61, 0.05), transparent 30%);
            color: var(--text);
            font-size: 16px;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.25s ease, border-color 0.25s ease, background 0.25s ease, box-shadow 0.25s ease;
        }

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

        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: transparent;
        }

        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            padding: 16px 0 8px;
        }

        .header-inner {
            max-width: var(--container);
            margin: 0 auto;
            padding: 8px 16px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            background: rgba(13, 22, 28, 0.85);
            border: 1px solid var(--border);
            border-radius: var(--radius-nav);
            backdrop-filter: blur(12px);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
        }

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

        .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: var(--grad-brand);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            color: #0B1519;
            box-shadow: 0 4px 12px rgba(15, 175, 154, 0.35);
        }

        .logo-text {
            font-size: 20px;
            font-weight: 800;
            color: var(--text);
            letter-spacing: 0.5px;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 8px;
            flex: 1;
            justify-content: center;
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 16px;
            border-radius: 12px;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid transparent;
            color: var(--text-sub);
            font-size: 14px;
            font-weight: 600;
            transition: all 0.25s ease;
        }

        .nav-link i {
            font-size: 14px;
        }

        .nav-link:hover {
            background: rgba(15, 175, 154, 0.15);
            color: var(--primary-light);
            border-color: rgba(15, 175, 154, 0.4);
            transform: translateY(-1px);
        }

        .nav-link.active {
            background: rgba(15, 175, 154, 0.18);
            color: var(--primary-light);
            border-color: rgba(15, 175, 154, 0.35);
        }

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

        .nav-toggle {
            display: none;
            flex-direction: column;
            justify-content: center;
            gap: 5px;
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid var(--border);
        }

        .nav-toggle span {
            display: block;
            width: 18px;
            height: 2px;
            background: var(--text);
            border-radius: 2px;
            margin: 0 auto;
            transition: all 0.3s ease;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 44px;
            padding: 0 22px;
            border-radius: var(--radius-btn);
            font-size: 14px;
            font-weight: 700;
            transition: all 0.25s ease;
            border: none;
            cursor: pointer;
            line-height: 1;
        }

        .btn:active {
            transform: scale(0.98);
        }

        .btn:focus-visible {
            outline: 2px solid var(--primary-light);
            outline-offset: 2px;
        }

        .btn-primary {
            background: var(--grad-accent);
            color: #1A0E06;
            box-shadow: 0 4px 16px rgba(255, 138, 61, 0.25);
        }

        .btn-primary:hover {
            background: var(--accent-light);
            box-shadow: 0 8px 30px rgba(255, 138, 61, 0.35);
            transform: translateY(-2px);
            color: #1A0E06;
        }

        .btn-secondary {
            background: transparent;
            border: 1px solid var(--primary);
            color: var(--primary-light);
        }

        .btn-secondary:hover {
            background: rgba(15, 175, 154, 0.15);
            border-color: var(--primary-light);
            color: #FFFFFF;
        }

        .btn-sm {
            height: 40px;
            padding: 0 16px;
            border-radius: 10px;
            font-size: 13px;
        }

        .btn-group {
            display: flex;
            gap: 12px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ===== Article Page ===== */
        .article-page {
            padding: 40px 0 80px;
            min-height: 60vh;
        }

        .article-head-card {
            background-image: linear-gradient(135deg, rgba(16, 30, 36, 0.95), rgba(16, 30, 36, 0.85)), url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 36px 40px;
            margin-bottom: 32px;
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow);
        }

        .article-head-card::before {
            content: '';
            position: absolute;
            top: -80px;
            right: -80px;
            width: 280px;
            height: 280px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(15, 175, 154, 0.18), transparent 70%);
            pointer-events: none;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 6px;
            font-size: 14px;
            color: var(--text-weak);
            margin-bottom: 18px;
            position: relative;
            z-index: 1;
        }

        .breadcrumb a {
            color: var(--text-sub);
        }

        .breadcrumb a:hover {
            color: var(--primary-light);
        }

        .breadcrumb .sep {
            color: rgba(255, 255, 255, 0.25);
        }

        .breadcrumb .current {
            color: var(--text-sub);
            max-width: 280px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        .article-title {
            font-size: 32px;
            font-weight: 800;
            line-height: 1.3;
            color: var(--text);
            margin: 0 0 18px;
            position: relative;
            z-index: 1;
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
            position: relative;
            z-index: 1;
        }

        .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            color: var(--text-sub);
        }

        .meta-item i {
            color: var(--primary-light);
        }

        .article-meta .meta-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 999px;
            background: rgba(15, 175, 154, 0.15);
            color: var(--primary-light);
            border: 1px solid rgba(15, 175, 154, 0.3);
        }

        /* ===== Article Content ===== */
        .article-content-wrap {
            max-width: 860px;
            margin: 0 auto;
        }

        .article-content {
            background: var(--bg-alt);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 40px 48px;
            box-shadow: var(--shadow);
        }

        .article-content p {
            margin-bottom: 1.2em;
            font-size: 16px;
            line-height: 1.8;
            color: var(--text);
        }

        .article-content h2 {
            font-size: 24px;
            font-weight: 800;
            margin: 2em 0 0.8em;
            color: var(--text);
            line-height: 1.4;
            padding-bottom: 8px;
            border-bottom: 1px solid var(--border);
        }

        .article-content h3 {
            font-size: 20px;
            font-weight: 700;
            margin: 1.6em 0 0.6em;
            color: var(--primary-light);
        }

        .article-content h4 {
            font-size: 17px;
            font-weight: 700;
            margin: 1.4em 0 0.5em;
            color: var(--text);
        }

        .article-content strong {
            color: #FFFFFF;
            font-weight: 700;
        }

        .article-content img {
            border-radius: 14px;
            margin: 1.5em 0;
            border: 1px solid var(--border);
        }

        .article-content a {
            color: var(--primary-light);
            text-decoration: underline;
            text-underline-offset: 4px;
        }

        .article-content a:hover {
            color: var(--accent-light);
        }

        .article-content blockquote {
            border-left: 4px solid var(--primary);
            background: rgba(15, 175, 154, 0.08);
            padding: 16px 20px;
            border-radius: 0 12px 12px 0;
            margin: 1.5em 0;
            color: var(--text-sub);
        }

        .article-content blockquote p:last-child {
            margin-bottom: 0;
        }

        .article-content pre {
            background: #0A1114;
            border: 1px solid var(--border);
            border-radius: 14px;
            padding: 20px;
            overflow-x: auto;
            margin: 1.5em 0;
            font-family: var(--font-mono);
            font-size: 14px;
            line-height: 1.7;
            color: #CDEAD9;
        }

        .article-content code {
            font-family: var(--font-mono);
            background: rgba(15, 175, 154, 0.12);
            padding: 2px 6px;
            border-radius: 4px;
            font-size: 14px;
            color: var(--primary-light);
        }

        .article-content pre code {
            background: transparent;
            padding: 0;
            color: inherit;
        }

        .article-content ul,
        .article-content ol {
            margin: 1em 0 1.2em;
            padding-left: 1.5em;
            color: var(--text);
        }

        .article-content ul li,
        .article-content ol li {
            margin-bottom: 0.5em;
            line-height: 1.8;
        }

        .article-content ul li::marker {
            color: var(--primary);
        }

        .article-content ol li::marker {
            color: var(--primary);
            font-weight: 700;
        }

        .article-content hr {
            border: none;
            height: 1px;
            background: var(--border);
            margin: 2em 0;
        }

        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5em 0;
            border: 1px solid var(--border);
            border-radius: 12px;
            overflow: hidden;
            font-size: 15px;
        }

        .article-content th {
            background: rgba(15, 175, 154, 0.12);
            color: var(--primary-light);
            font-weight: 600;
            padding: 10px 14px;
            border: 1px solid var(--border);
        }

        .article-content td {
            padding: 10px 14px;
            border: 1px solid var(--border);
            color: var(--text-sub);
        }

        .article-empty {
            text-align: center;
            padding: 60px 20px;
            background: var(--bg-alt);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
        }

        .article-empty i {
            font-size: 48px;
            color: var(--primary);
            margin-bottom: 16px;
            display: block;
        }

        .article-empty p {
            color: var(--text-sub);
            font-size: 16px;
            margin-bottom: 24px;
        }

        .article-empty-full {
            max-width: 640px;
            margin: 80px auto;
            text-align: center;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 60px 40px;
            box-shadow: var(--shadow);
        }

        .article-empty-full i {
            font-size: 52px;
            color: var(--primary);
            margin-bottom: 16px;
            display: block;
        }

        .article-empty-full h2 {
            font-size: 22px;
            font-weight: 800;
            margin-bottom: 12px;
            color: var(--text);
        }

        .article-empty-full p {
            color: var(--text-sub);
            margin-bottom: 24px;
        }

        /* ===== Article Nav ===== */
        .article-nav-links {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            margin: 36px auto 56px;
            flex-wrap: wrap;
            max-width: 860px;
        }

        .article-nav-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            height: 44px;
            padding: 0 20px;
            border-radius: 12px;
            border: 1px solid var(--border);
            color: var(--text-sub);
            font-size: 14px;
            font-weight: 600;
            transition: all 0.25s ease;
        }

        .article-nav-btn:hover {
            border-color: var(--primary);
            color: var(--primary-light);
            background: rgba(15, 175, 154, 0.08);
        }

        /* ===== Related ===== */
        .related-section {
            margin: 56px 0 0;
        }

        .section-title {
            font-size: 26px;
            font-weight: 800;
            color: var(--text);
            margin-bottom: 28px;
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .section-title::after {
            content: '';
            flex: 1;
            height: 1px;
            background: var(--border);
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .related-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            overflow: hidden;
            transition: all 0.25s ease;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
        }

        .related-card:hover {
            transform: translateY(-6px);
            border-color: var(--border-hover);
            box-shadow: 0 16px 48px rgba(0, 0, 0, 0.35);
        }

        .related-card img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-bottom: 1px solid var(--border);
        }

        .related-body {
            padding: 20px 22px;
        }

        .related-body h3 {
            font-size: 16px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 10px;
            line-height: 1.5;
            transition: color 0.25s ease;
        }

        .related-card:hover .related-body h3 {
            color: var(--primary-light);
        }

        .related-body p {
            font-size: 14px;
            color: var(--text-sub);
            line-height: 1.7;
            margin-bottom: 12px;
        }

        .related-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary-light);
        }

        /* ===== Comment ===== */
        .comment-section {
            margin-top: 56px;
        }

        .comment-placeholder {
            background: var(--card-bg);
            border: 1px dashed rgba(255, 255, 255, 0.15);
            border-radius: var(--radius-card);
            padding: 40px;
            text-align: center;
        }

        .comment-icon {
            font-size: 36px;
            color: var(--primary);
            margin-bottom: 12px;
        }

        .comment-placeholder p {
            color: var(--text-weak);
            font-size: 14px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-alt);
            border-top: 1px solid var(--border);
            padding: 56px 0 24px;
            margin-top: 80px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 36px;
        }

        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
        }

        .footer-logo .logo-icon {
            width: 40px;
            height: 40px;
            border-radius: 12px;
            background: var(--grad-brand);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 17px;
            color: #0B1519;
        }

        .footer-logo .logo-text {
            font-size: 22px;
            font-weight: 800;
            color: var(--text);
        }

        .footer-desc {
            color: var(--text-sub);
            font-size: 14px;
            line-height: 1.8;
            max-width: 320px;
        }

        .footer-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 16px;
        }

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

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            color: var(--text-sub);
            font-size: 14px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: color 0.25s ease, padding-left 0.25s ease;
        }

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

        .footer-links i {
            color: var(--primary);
            font-size: 12px;
        }

        .footer-contact p {
            color: var(--text-sub);
            font-size: 14px;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .footer-contact i {
            color: var(--primary);
            width: 18px;
        }

        .footer-bottom {
            border-top: 1px solid var(--border);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            color: var(--text-weak);
            font-size: 13px;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .nav-menu {
                position: fixed;
                top: 70px;
                left: 16px;
                right: 16px;
                flex-direction: column;
                align-items: stretch;
                background: rgba(13, 22, 28, 0.97);
                border: 1px solid var(--border);
                border-radius: 16px;
                padding: 16px;
                display: none;
                gap: 8px;
                box-shadow: var(--shadow);
            }

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

            .nav-toggle {
                display: flex;
            }

            .nav-actions .btn-sm {
                display: none;
            }
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .article-title {
                font-size: 26px;
            }

            .article-head-card {
                padding: 24px 20px;
            }

            .article-content {
                padding: 24px 20px;
            }

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

            .article-nav-links {
                flex-direction: column;
                width: 100%;
            }

            .article-nav-links .btn,
            .article-nav-links .article-nav-btn {
                width: 100%;
            }

            .article-page {
                padding: 24px 0 60px;
            }

            .section-title {
                font-size: 22px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }

            .logo-text {
                font-size: 17px;
            }

            .article-title {
                font-size: 22px;
            }

            .related-body h3 {
                font-size: 15px;
            }

            .article-meta {
                gap: 10px;
            }

            .meta-item {
                font-size: 13px;
            }

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

/* roulang page: category1 */
:root {
            --primary: #0FAF9A;
            --primary-light: #2EE6C7;
            --primary-dark: #0B7E72;
            --action: #FF8A3D;
            --action-hover: #FFA266;
            --bg-main: #0B1519;
            --bg-alt: #101E24;
            --bg-card: rgba(255, 255, 255, 0.04);
            --border: rgba(255, 255, 255, 0.08);
            --border-hover: rgba(47, 230, 199, 0.6);
            --text-main: #F2F7F6;
            --text-sub: #A7B8B5;
            --text-weak: #6B837E;
            --success: #54E3A8;
            --warning: #FFD166;
            --radius-lg: 20px;
            --radius-md: 16px;
            --radius-sm: 12px;
            --shadow-card: 0 12px 40px rgba(0, 0, 0, 0.25);
            --shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.35);
            --grad-brand: linear-gradient(135deg, #0FAF9A 0%, #2EE6C7 100%);
            --grad-action: linear-gradient(135deg, #FF8A3D 0%, #FFA266 100%);
            --font-head: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
            --font-body: system-ui, "Microsoft YaHei", "PingFang SC", sans-serif;
            --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-body);
            font-size: 16px;
            line-height: 1.7;
            background: var(--bg-main);
            color: var(--text-main);
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: color .25s ease;
        }
        a:hover {
            color: var(--primary);
        }
        ul,
        ol {
            list-style: none;
        }
        button {
            font-family: inherit;
        }
        .grid-container {
            max-width: 1200px;
        }

        /* Header */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            padding: 16px 24px 0;
        }
        .header-inner {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            background: rgba(13, 22, 28, 0.85);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 10px 16px;
            backdrop-filter: blur(12px);
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-main);
            font-family: var(--font-head);
            font-size: 20px;
            font-weight: 800;
            letter-spacing: .5px;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: var(--grad-brand);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #0B1519;
            font-size: 18px;
        }
        .logo:hover {
            color: var(--primary-light);
        }
        .logo:hover .logo-icon {
            transform: scale(1.05);
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-link {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 8px 14px;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.05);
            color: var(--text-sub);
            font-size: 14px;
            font-weight: 500;
            border: 1px solid transparent;
            transition: all .25s ease;
            white-space: nowrap;
        }
        .nav-link .nav-icon {
            color: var(--primary-light);
            font-size: 14px;
        }
        .nav-link:hover {
            background: rgba(15, 175, 154, 0.15);
            border-color: var(--primary);
            color: var(--text-main);
        }
        .nav-link.active {
            background: rgba(15, 175, 154, 0.2);
            border-color: rgba(15, 175, 154, 0.4);
            color: var(--primary-light);
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 44px;
            padding: 0 24px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: all .25s ease;
            line-height: 1;
        }
        .btn-primary {
            background: var(--grad-action);
            color: #141414;
        }
        .btn-primary:hover {
            background: var(--action-hover);
            box-shadow: 0 8px 30px rgba(255, 138, 61, 0.35);
            color: #141414;
        }
        .btn-primary:active {
            transform: scale(0.98);
        }
        .btn-primary:focus-visible {
            outline: 3px solid rgba(255, 138, 61, 0.4);
            outline-offset: 2px;
        }
        .btn-outline {
            background: transparent;
            border: 1px solid var(--primary);
            color: var(--primary-light);
        }
        .btn-outline:hover {
            background: rgba(15, 175, 154, 0.15);
            color: var(--primary-light);
        }
        .btn-outline:active {
            transform: scale(0.98);
        }
        .btn-outline:focus-visible {
            outline: 3px solid rgba(15, 175, 154, 0.35);
            outline-offset: 2px;
        }
        .btn-sm {
            height: 36px;
            padding: 0 16px;
            font-size: 13px;
            border-radius: 10px;
        }
        .btn-lg {
            height: 56px;
            min-width: 240px;
            padding: 0 32px;
            font-size: 17px;
            border-radius: 14px;
        }
        .btn-cta {
            background: var(--grad-action);
            color: #141414;
        }
        .btn-cta:hover {
            color: #141414;
            box-shadow: 0 8px 30px rgba(255, 138, 61, 0.4);
            background: var(--action-hover);
        }
        .btn-outline-light {
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.3);
            color: var(--text-main);
        }
        .btn-outline-light:hover {
            border-color: var(--primary-light);
            color: var(--primary-light);
            background: rgba(255, 255, 255, 0.04);
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: transparent;
            border: none;
            padding: 8px;
            cursor: pointer;
            border-radius: 8px;
            transition: background .25s ease;
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.06);
        }
        .nav-toggle span {
            width: 22px;
            height: 2px;
            background: var(--text-main);
            border-radius: 2px;
            transition: all .25s ease;
        }

        /* Page Hero */
        .page-hero {
            position: relative;
            padding: 170px 0 84px;
            background-size: cover;
            background-position: center;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(11, 21, 25, 0.88) 0%, rgba(11, 21, 25, 0.78) 55%, var(--bg-main) 100%);
        }
        .page-hero .grid-container {
            position: relative;
            z-index: 2;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-weak);
            margin-bottom: 24px;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-sub);
        }
        .breadcrumb a:hover {
            color: var(--primary-light);
        }
        .breadcrumb i {
            font-size: 11px;
            color: var(--text-weak);
        }
        .breadcrumb span {
            color: var(--primary-light);
        }
        .page-hero h1 {
            font-family: var(--font-head);
            font-size: 40px;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 16px;
            color: var(--text-main);
            max-width: 780px;
        }
        .page-hero-sub {
            font-size: 18px;
            color: var(--text-sub);
            max-width: 640px;
            margin-bottom: 32px;
            line-height: 1.7;
        }
        .page-hero-actions {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }

        /* Sections */
        .section {
            padding: 80px 0;
        }
        .section-header {
            text-align: center;
            max-width: 680px;
            margin: 0 auto 48px;
        }
        .section-tag {
            display: inline-block;
            padding: 5px 14px;
            border-radius: 100px;
            background: rgba(15, 175, 154, 0.12);
            border: 1px solid rgba(15, 175, 154, 0.25);
            color: var(--primary-light);
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 12px;
        }
        .section-header h2 {
            font-family: var(--font-head);
            font-size: 30px;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 12px;
            line-height: 1.3;
        }
        .section-header p {
            color: var(--text-sub);
            font-size: 15px;
        }

        .intro-section {
            background: transparent;
        }
        .tool-types-section {
            background: var(--bg-alt);
        }
        .platform-section {
            background: transparent;
        }
        .process-section {
            background: var(--bg-alt);
        }
        .resource-section {
            background: transparent;
        }
        .faq-section {
            background: var(--bg-alt);
        }
        .cta-section {
            background: transparent;
            padding-bottom: 100px;
        }

        /* Intro Cards */
        .intro-img,
        .process-img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border);
            width: 100%;
            height: auto;
            transition: transform .25s ease, border-color .25s ease;
        }
        .intro-img:hover,
        .process-img:hover {
            border-color: var(--border-hover);
            transform: translateY(-4px);
        }
        .check-list {
            margin: 20px 0 28px;
        }
        .check-list li {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px 0;
            color: var(--text-sub);
            font-size: 15px;
        }
        .check-list li i {
            color: var(--success);
            font-size: 16px;
        }

        /* Tool Cards */
        .card-wrap {
            margin-bottom: 24px;
        }
        .tool-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 28px;
            height: 100%;
            transition: all .25s ease;
            box-shadow: var(--shadow-card);
        }
        .tool-card:hover {
            transform: translateY(-4px);
            border-color: var(--border-hover);
            box-shadow: var(--shadow-hover);
        }
        .tool-icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            background: var(--grad-brand);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: #0B1519;
            margin-bottom: 18px;
        }
        .tool-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 10px;
        }
        .tool-card p {
            color: var(--text-sub);
            font-size: 14px;
            line-height: 1.7;
            margin-bottom: 16px;
        }
        .tool-tag {
            display: inline-block;
            padding: 3px 10px;
            border-radius: 100px;
            background: rgba(255, 255, 255, 0.06);
            color: var(--text-weak);
            font-size: 12px;
            font-weight: 500;
        }

        /* Stats */
        .stat-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            text-align: center;
            height: 100%;
            transition: all .25s ease;
        }
        .stat-card:hover {
            border-color: var(--border-hover);
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .stat-num {
            display: block;
            font-family: var(--font-mono);
            font-size: 36px;
            font-weight: 700;
            background: var(--grad-brand);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 8px;
            font-feature-settings: "tnum";
            line-height: 1.2;
        }
        .stat-label {
            font-size: 13px;
            color: var(--text-sub);
        }
        .platform-tags {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 36px;
        }
        .platform-tags span {
            padding: 8px 18px;
            border-radius: 100px;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid var(--border);
            color: var(--text-sub);
            font-size: 13px;
            transition: border-color .25s ease, color .25s ease;
        }
        .platform-tags span:hover {
            border-color: var(--primary);
            color: var(--primary-light);
        }

        /* Process */
        .process-list {
            margin: 24px 0 28px;
            padding: 0;
        }
        .process-list li {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 14px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            color: var(--text-main);
            font-size: 15px;
        }
        .process-list li:last-child {
            border-bottom: none;
        }
        .process-num {
            font-family: var(--font-mono);
            font-size: 14px;
            font-weight: 700;
            color: var(--primary-light);
            background: rgba(15, 175, 154, 0.1);
            border-radius: 8px;
            padding: 4px 10px;
            font-feature-settings: "tnum";
            flex-shrink: 0;
        }

        /* Resource Cards */
        .resource-card {
            display: block;
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            height: 100%;
            transition: all .25s ease;
            box-shadow: var(--shadow-card);
        }
        .resource-card:hover {
            transform: translateY(-4px);
            border-color: var(--border-hover);
            box-shadow: var(--shadow-hover);
        }
        .resource-card img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            transition: transform .3s ease;
        }
        .resource-card:hover img {
            transform: scale(1.03);
        }
        .resource-body {
            padding: 20px 24px 24px;
        }
        .resource-body h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 8px;
        }
        .resource-card:hover .resource-body h3 {
            color: var(--primary-light);
        }
        .resource-body p {
            font-size: 14px;
            color: var(--text-sub);
            line-height: 1.7;
            margin-bottom: 12px;
        }
        .resource-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary-light);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .resource-card:hover .resource-link i {
            transform: translateX(4px);
        }
        .resource-link i {
            transition: transform .25s ease;
        }

        /* FAQ */
        .custom-accordion {
            max-width: 820px;
            margin: 0 auto;
        }
        .custom-accordion .accordion-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            margin-bottom: 14px;
            overflow: hidden;
            transition: border-color .25s ease, background .25s ease;
        }
        .custom-accordion .accordion-item.is-active {
            border-color: var(--border-hover);
            background: rgba(15, 175, 154, 0.06);
        }
        .custom-accordion .accordion-title {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 20px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-main);
            background: transparent !important;
            border: none !important;
            transition: color .25s ease;
        }
        .custom-accordion .accordion-title:hover {
            color: var(--primary-light);
        }
        .custom-accordion .accordion-title::before {
            display: none !important;
        }
        .custom-accordion .accordion-title::after {
            content: "\f078";
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            font-size: 12px;
            color: var(--text-weak);
            transition: transform .25s ease, color .25s ease;
            margin-left: 12px;
            flex-shrink: 0;
        }
        .custom-accordion .accordion-item.is-active>.accordion-title::after {
            transform: rotate(180deg);
            color: var(--primary-light);
        }
        .custom-accordion .accordion-content {
            padding: 0 20px 20px;
            color: var(--text-sub);
            font-size: 14px;
            line-height: 1.8;
            background: transparent !important;
            border: none !important;
        }
        .custom-accordion .accordion-content p {
            color: var(--text-sub);
            font-size: 14px;
            line-height: 1.8;
            margin-bottom: 0;
        }

        /* CTA */
        .cta-card {
            background: linear-gradient(135deg, rgba(15, 175, 154, 0.15) 0%, rgba(255, 138, 61, 0.1) 100%);
            border: 1px solid rgba(15, 175, 154, 0.3);
            border-radius: 24px;
            padding: 60px 40px;
            text-align: center;
            box-shadow: var(--shadow-card);
            position: relative;
            overflow: hidden;
        }
        .cta-card::before {
            content: "";
            position: absolute;
            top: -60px;
            right: -60px;
            width: 180px;
            height: 180px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(46, 230, 199, 0.12), transparent 70%);
            pointer-events: none;
        }
        .cta-card h2 {
            font-family: var(--font-head);
            font-size: 30px;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 12px;
        }
        .cta-card p {
            color: var(--text-sub);
            font-size: 16px;
            margin-bottom: 32px;
        }
        .cta-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* Footer */
        .site-footer {
            background: #081114;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 64px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1.2fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
        }
        .footer-logo .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: var(--grad-brand);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #0B1519;
            font-size: 18px;
        }
        .footer-logo .logo-text {
            font-family: var(--font-head);
            font-size: 20px;
            font-weight: 800;
            color: var(--text-main);
        }
        .footer-desc {
            color: var(--text-weak);
            font-size: 14px;
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-title {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 16px;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            color: var(--text-sub);
            font-size: 14px;
            transition: color .25s ease, padding-left .25s ease;
        }
        .footer-links a:hover {
            color: var(--primary-light);
            padding-left: 4px;
        }
        .footer-links i {
            font-size: 12px;
            margin-right: 6px;
            color: var(--primary);
        }
        .footer-contact p {
            color: var(--text-sub);
            font-size: 14px;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-contact i {
            color: var(--primary-light);
            width: 18px;
            text-align: center;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            color: var(--text-weak);
            font-size: 13px;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .nav-toggle {
                display: flex;
            }
            .nav-menu {
                position: absolute;
                top: calc(100% + 8px);
                left: 16px;
                right: 16px;
                flex-direction: column;
                gap: 8px;
                background: rgba(13, 22, 28, 0.97);
                border: 1px solid var(--border);
                border-radius: var(--radius-md);
                padding: 12px;
                display: none;
                box-shadow: var(--shadow-card);
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-link {
                width: 100%;
                white-space: normal;
            }
            .site-header {
                padding: 12px 12px 0;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .cta-card {
                padding: 48px 28px;
            }
        }
        @media (max-width: 768px) {
            .section {
                padding: 48px 0;
            }
            .page-hero {
                padding: 130px 0 48px;
            }
            .page-hero h1 {
                font-size: 28px;
            }
            .page-hero-sub {
                font-size: 16px;
            }
            .section-header h2 {
                font-size: 22px;
            }
            .section-header {
                margin-bottom: 32px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-card {
                padding: 40px 20px;
            }
            .cta-card h2 {
                font-size: 22px;
            }
            .btn-lg {
                width: 100%;
                min-width: 0;
            }
            .stat-num {
                font-size: 28px;
            }
            .tool-card {
                padding: 22px;
            }
        }
        @media (max-width: 520px) {
            .header-inner {
                padding: 8px 12px;
                gap: 10px;
            }
            .logo-text {
                font-size: 17px;
            }
            .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 15px;
            }
            .nav-actions .btn-sm {
                display: none;
            }
            .page-hero-actions .btn {
                width: 100%;
            }
            .platform-tags {
                gap: 8px;
            }
            .platform-tags span {
                padding: 6px 14px;
                font-size: 12px;
            }
            .cta-actions .btn {
                width: 100%;
            }
        }
        @media (max-width: 639px) {
            .cell {
                padding-left: 0.9375rem;
                padding-right: 0.9375rem;
            }
        }

/* roulang page: category2 */
:root {
            --primary: #0FAF9A;
            --primary-light: #2EE6C7;
            --primary-dark: #0B7E72;
            --accent: #FF8A3D;
            --accent-hover: #FFA266;
            --bg: #0B1519;
            --bg-alt: #101E24;
            --card-bg: rgba(255, 255, 255, 0.04);
            --border: rgba(255, 255, 255, 0.08);
            --border-hover: rgba(47, 230, 199, 0.6);
            --text: #F2F7F6;
            --text-secondary: #A7B8B5;
            --text-weak: #6B837E;
            --success: #54E3A8;
            --warning: #FFD166;
            --radius: 20px;
            --radius-sm: 12px;
            --shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
            --shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.35);
            --transition: all 0.25s ease;
            --font-heading: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
            --font-body: system-ui, "Microsoft YaHei", "PingFang SC", sans-serif;
            --container: 1200px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-body);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
        }

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

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

        a:hover {
            color: #fff;
        }

        ul, ol {
            list-style: none;
        }

        button, input, select, textarea {
            font-family: inherit;
        }

        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 44px;
            padding: 0 24px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 700;
            border: 1px solid transparent;
            cursor: pointer;
            transition: var(--transition);
            line-height: 1;
            font-family: var(--font-heading);
            white-space: nowrap;
        }

        .btn-primary {
            background: linear-gradient(135deg, #FF8A3D, #FFA266);
            color: #1A120A;
            box-shadow: 0 4px 16px rgba(255, 138, 61, 0.25);
        }

        .btn-primary:hover {
            background: linear-gradient(135deg, #FFA266, #FFB380);
            color: #1A120A;
            box-shadow: 0 8px 30px rgba(255, 138, 61, 0.35);
            transform: translateY(-2px);
        }

        .btn-primary:active {
            transform: scale(0.98);
        }

        .btn-secondary {
            background: transparent;
            border: 1px solid var(--primary);
            color: var(--primary-light);
        }

        .btn-secondary:hover {
            background: rgba(15, 175, 154, 0.15);
            border-color: var(--primary-light);
            color: var(--text);
            transform: translateY(-2px);
        }

        .btn-secondary:active {
            transform: scale(0.98);
        }

        .btn-lg {
            height: 56px;
            padding: 0 32px;
            border-radius: 14px;
            font-size: 16px;
            min-width: 220px;
        }

        .btn-sm {
            height: 40px;
            padding: 0 20px;
            font-size: 14px;
            border-radius: 10px;
        }

        .btn:focus-visible,
        .nav-link:focus-visible,
        a:focus-visible,
        .faq-question:focus-visible {
            outline: 2px solid var(--primary-light);
            outline-offset: 2px;
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            padding: 16px 24px 0;
        }

        .header-inner {
            position: relative;
            max-width: var(--container);
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            background: rgba(13, 22, 28, 0.85);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border);
            border-radius: 16px;
            padding: 12px 20px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-heading);
            font-weight: 800;
            font-size: 22px;
            color: var(--text);
            flex-shrink: 0;
        }

        .logo-icon {
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #0FAF9A, #2EE6C7);
            border-radius: 10px;
            color: #0B1519;
            font-size: 18px;
        }

        .logo-text {
            font-size: 22px;
            font-weight: 800;
            letter-spacing: 1px;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 8px;
            flex: 1;
            justify-content: center;
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 18px;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid transparent;
            color: var(--text-secondary);
            font-size: 14px;
            font-weight: 600;
            transition: var(--transition);
            white-space: nowrap;
        }

        .nav-link i {
            font-size: 14px;
            color: var(--primary-light);
        }

        .nav-link:hover {
            background: rgba(15, 175, 154, 0.15);
            border-color: rgba(47, 230, 199, 0.4);
            color: var(--text);
        }

        .nav-link.active {
            background: rgba(15, 175, 154, 0.18);
            border-color: rgba(47, 230, 199, 0.5);
            color: var(--text);
        }

        .nav-link.active i {
            color: var(--primary-light);
        }

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

        .nav-toggle {
            display: none;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--border);
            border-radius: 10px;
            width: 42px;
            height: 42px;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 4px;
            cursor: pointer;
        }

        .nav-toggle span {
            width: 20px;
            height: 2px;
            background: var(--text);
            border-radius: 2px;
            transition: var(--transition);
        }

        .page-hero {
            position: relative;
            padding: 84px 0;
            background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
            border-bottom: 1px solid var(--border);
        }

        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(11, 21, 25, 0.92) 0%, rgba(16, 30, 36, 0.78) 100%);
        }

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

        .page-hero h1 {
            font-family: var(--font-heading);
            font-size: 40px;
            font-weight: 800;
            line-height: 1.2;
            color: var(--text);
            margin-bottom: 16px;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-weak);
            margin-bottom: 20px;
        }

        .breadcrumb a {
            color: var(--text-weak);
            transition: var(--transition);
        }

        .breadcrumb a:hover {
            color: var(--primary-light);
        }

        .breadcrumb .sep {
            color: var(--text-weak);
            opacity: 0.5;
        }

        .hero-desc {
            max-width: 760px;
            font-size: 17px;
            line-height: 1.8;
            color: var(--text-secondary);
            margin-top: 8px;
        }

        .hero-desc:first-of-type {
            margin-top: 0;
        }

        .section {
            padding: 80px 0;
        }

        .section-alt {
            background: var(--bg-alt);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }

        .section-header {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 48px;
        }

        .section-header h2 {
            font-family: var(--font-heading);
            font-size: 30px;
            font-weight: 800;
            color: var(--text);
            margin-bottom: 12px;
        }

        .section-header p {
            color: var(--text-secondary);
            font-size: 16px;
            line-height: 1.7;
        }

        .feature-card {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 32px;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }

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

        .feature-card.reverse .feature-media {
            order: 2;
        }

        .feature-media {
            border-radius: 16px;
            overflow: hidden;
            background: rgba(255, 255, 255, 0.02);
            border: 1px solid var(--border);
        }

        .feature-media img {
            width: 100%;
            height: 320px;
            object-fit: cover;
        }

        .feature-content h3 {
            font-family: var(--font-heading);
            font-size: 24px;
            font-weight: 800;
            color: var(--text);
            margin-bottom: 16px;
        }

        .feature-content > p {
            color: var(--text-secondary);
            font-size: 16px;
            line-height: 1.8;
            margin-bottom: 20px;
        }

        .feature-list {
            display: grid;
            gap: 12px;
        }

        .feature-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.6;
        }

        .feature-list li i {
            color: var(--primary-light);
            margin-top: 4px;
            flex-shrink: 0;
        }

        .spec-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .spec-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 16px;
            padding: 24px;
            transition: var(--transition);
        }

        .spec-item:hover {
            border-color: var(--border-hover);
            transform: translateY(-4px);
            box-shadow: var(--shadow);
        }

        .spec-icon {
            width: 48px;
            height: 48px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, rgba(15, 175, 154, 0.2), rgba(46, 230, 199, 0.1));
            border-radius: 12px;
            font-size: 22px;
            color: var(--primary-light);
            margin-bottom: 16px;
        }

        .spec-item h4 {
            font-family: var(--font-heading);
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 8px;
        }

        .spec-item p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .step-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
            margin-top: 8px;
        }

        .step-card {
            position: relative;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 16px;
            padding: 24px 20px;
            text-align: center;
            transition: var(--transition);
        }

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

        .step-num {
            font-family: 'JetBrains Mono', 'Courier New', monospace;
            font-size: 42px;
            font-weight: 800;
            background: linear-gradient(135deg, #0FAF9A, #2EE6C7);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1;
            display: block;
            margin-bottom: 12px;
        }

        .step-card h4 {
            font-family: var(--font-heading);
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 8px;
        }

        .step-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .resource-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .resource-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 28px;
            display: flex;
            flex-direction: column;
            gap: 12px;
            transition: var(--transition);
        }

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

        .resource-card .icon {
            width: 48px;
            height: 48px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(255, 138, 61, 0.15);
            border-radius: 12px;
            font-size: 22px;
            color: var(--accent);
        }

        .resource-card h4 {
            font-family: var(--font-heading);
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
        }

        .resource-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            flex: 1;
        }

        .resource-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--primary-light);
            font-size: 14px;
            font-weight: 600;
            margin-top: 8px;
        }

        .resource-link i {
            transition: transform 0.25s;
        }

        .resource-link:hover i {
            transform: translateX(4px);
        }

        .faq-section .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: grid;
            gap: 16px;
        }

        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 16px;
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item.active {
            border-color: var(--border-hover);
            background: rgba(15, 175, 154, 0.06);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 20px 24px;
            background: transparent;
            border: none;
            color: var(--text);
            font-size: 16px;
            font-weight: 600;
            font-family: var(--font-heading);
            cursor: pointer;
            text-align: left;
            transition: var(--transition);
        }

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

        .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
            background: rgba(15, 175, 154, 0.15);
            color: var(--primary-light);
            font-size: 14px;
            transition: transform 0.3s;
        }

        .faq-item.active .faq-icon {
            transform: rotate(180deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }

        .faq-answer-inner {
            padding: 0 24px 20px;
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.7;
        }

        .cta-section {
            padding: 80px 0;
            background: linear-gradient(135deg, rgba(15, 175, 154, 0.08), rgba(255, 138, 61, 0.05));
            border-top: 1px solid var(--border);
        }

        .cta-box {
            text-align: center;
            max-width: 700px;
            margin: 0 auto;
        }

        .cta-box h2 {
            font-family: var(--font-heading);
            font-size: 32px;
            font-weight: 800;
            color: var(--text);
            margin-bottom: 12px;
        }

        .cta-box p {
            color: var(--text-secondary);
            font-size: 16px;
            line-height: 1.7;
            margin-bottom: 32px;
        }

        .cta-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .site-footer {
            background: #0A1318;
            border-top: 1px solid var(--border);
            padding: 64px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1.5fr;
            gap: 48px;
            padding-bottom: 40px;
        }

        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-heading);
            font-size: 20px;
            font-weight: 800;
            color: var(--text);
            margin-bottom: 12px;
        }

        .footer-desc {
            color: var(--text-weak);
            font-size: 14px;
            line-height: 1.7;
            max-width: 360px;
        }

        .footer-title {
            font-family: var(--font-heading);
            font-size: 16px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 16px;
        }

        .footer-links {
            display: grid;
            gap: 8px;
        }

        .footer-links a {
            color: var(--text-weak);
            font-size: 14px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: var(--transition);
        }

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

        .footer-links i {
            font-size: 12px;
            color: var(--primary);
        }

        .footer-contact p {
            color: var(--text-weak);
            font-size: 14px;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .footer-contact i {
            color: var(--primary-light);
            width: 16px;
            text-align: center;
        }

        .footer-bottom {
            border-top: 1px solid var(--border);
            padding: 20px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            color: var(--text-weak);
            font-size: 13px;
        }

        @media (max-width: 1024px) {
            .spec-grid,
            .step-grid,
            .resource-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .feature-card {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .feature-card.reverse .feature-media {
                order: 0;
            }
        }

        @media (max-width: 768px) {
            .section {
                padding: 48px 0;
            }

            .page-hero {
                padding: 48px 0;
            }

            .page-hero h1 {
                font-size: 28px;
            }

            .section-header {
                margin-bottom: 32px;
            }

            .section-header h2 {
                font-size: 22px;
            }

            .nav-menu {
                display: none;
                position: absolute;
                top: calc(100% + 8px);
                left: 0;
                right: 0;
                background: rgba(13, 22, 28, 0.96);
                border-radius: 16px;
                border: 1px solid var(--border);
                padding: 12px;
                flex-direction: column;
                align-items: stretch;
                gap: 8px;
                box-shadow: var(--shadow);
            }

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

            .nav-link {
                justify-content: flex-start;
                padding: 14px 16px;
            }

            .nav-toggle {
                display: flex;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }

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

            .cta-box h2 {
                font-size: 24px;
            }

            .feature-media img {
                height: 220px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }

            .site-header {
                padding: 12px 16px 0;
            }

            .header-inner {
                padding: 10px 14px;
                gap: 12px;
            }

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

            .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 16px;
            }

            .nav-actions .btn-sm {
                display: none;
            }

            .spec-grid,
            .step-grid,
            .resource-grid {
                grid-template-columns: 1fr;
            }

            .feature-card {
                padding: 20px;
            }

            .feature-content h3 {
                font-size: 20px;
            }

            .cta-actions .btn {
                width: 100%;
            }

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