/* roulang page: index */
:root {
            --brand-50: #eef4ff;
            --brand-100: #d9e6ff;
            --brand-500: #3b5ef0;
            --brand-600: #2c45d6;
            --brand-700: #2739b5;
            --accent: #f59b2e;
            --bg-light: #f8faff;
            --text-dark: #0f172a;
            --text-muted: #64748b;
            --border-light: #e2e8f0;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.05);
            --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.1);
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            margin: 0;
            font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            background-color: #fff;
            color: var(--text-dark);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            text-decoration: none;
            color: inherit;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
        }

        ul,
        ol {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .container {
            max-width: 1240px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            border-radius: 999px;
            font-weight: 600;
            font-size: 14px;
        }

        .nav-link {
            position: relative;
            display: inline-flex;
            align-items: center;
            padding: 8px 2px;
            margin: 0 14px;
            font-size: 15px;
            font-weight: 500;
            color: #334155;
            transition: color 0.3s ease;
            white-space: nowrap;
        }

        .nav-link:hover {
            color: var(--brand-500);
        }

        .nav-link.active {
            color: var(--brand-600);
            font-weight: 600;
        }

        .nav-link.active::after,
        .nav-link:hover::after {
            content: '';
            position: absolute;
            left: 0;
            right: 0;
            bottom: 0;
            height: 2px;
            background: var(--brand-500);
            border-radius: 2px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 12px;
            font-weight: 600;
            font-size: 16px;
            transition: all 0.3s ease;
            line-height: 1;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--brand-500), var(--brand-700));
            color: #fff;
            box-shadow: rgba(59, 94, 240, 0.35) 0 8px 20px -6px;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: rgba(59, 94, 240, 0.45) 0 14px 30px -8px;
        }

        .btn-accent {
            background: linear-gradient(135deg, #f7a63c, #ef8400);
            color: #fff;
            box-shadow: rgba(245, 155, 46, 0.3) 0 8px 20px -6px;
        }

        .btn-accent:hover {
            transform: translateY(-2px);
        }

        .btn-outline {
            border: 1px solid rgba(239, 246, 255, 0.6);
            color: #fff;
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(8px);
        }

        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.24);
            border-color: #fff;
        }

        .card {
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            transition: all 0.3s ease;
        }

        .card-hover:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }

        .form-input:focus {
            outline: none;
            border-color: var(--brand-400);
            box-shadow: 0 0 0 4px rgba(59, 94, 240, 0.15);
        }

        .footer-link {
            transition: all 0.3s;
            opacity: 0.78;
            display: inline-block;
            padding: 2px 0;
        }

        .footer-link:hover {
            opacity: 1;
            transform: translateX(4px);
            color: #fff;
        }

        .reveal-text {
            background: linear-gradient(120deg, #fff, #bfd0ff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-pattern {
            background-image: url('/assets/images/backpic/back-1.png');
            background-position: center;
            background-size: cover;
            background-repeat: no-repeat;
            background-color: #0d1b4c;
        }

        .covercard-img {
            transition: transform 0.5s ease;
        }

        .card-hover:hover .covercard-img {
            transform: scale(1.03);
        }

        .mask-gradient {
            background: linear-gradient(180deg, rgba(15, 23, 42, 0.02) 0%, rgba(15, 23, 42, 0.85) 100%);
        }

        @media (max-width: 768px) {
            .nav-link {
                margin: 0 8px;
                font-size: 14px;
            }
            .mobile-menu-trigger {
                display: block;
            }
            .desktop-nav {
                display: none;
            }
            .btn {
                padding: 10px 18px;
                font-size: 15px;
            }
        }

        @media (min-width: 769px) {
            .mobile-menu-trigger {
                display: none;
            }
        }

        @media (max-width: 640px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

/* roulang page: article */
:root {
            --brand: #7c3aed;
            --brand-dark: #5b21b6;
            --ink: #0f172a;
            --sub: #64748b;
            --surface: #f8fafc;
            --line: #e2e8f0;
            --radius: 1rem;
            --shadow: 0 10px 30px -12px rgba(15, 23, 42, .16);
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: inherit;
            background-color: #fff;
            color: var(--ink);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

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

        a,
        button,
        input {
            transition: all .2s ease;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid rgba(124, 58, 237, .45);
            outline-offset: 2px;
        }

        .nav-link {
            font-weight: 500;
            font-size: .95rem;
            color: #334155;
            padding: .5rem .8rem;
            border-radius: .75rem;
            transition: all .2s ease;
        }

        .nav-link:hover {
            background: #f1f5f9;
            color: #0f172a;
        }

        .nav-link.active {
            color: var(--brand);
            background: #ede9fe;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: .85rem;
            font-weight: 600;
            gap: .5rem;
            padding: .65rem 1.15rem;
            font-size: .95rem;
            transition: all .25s ease;
        }

        .btn-primary {
            background: var(--brand);
            color: #fff;
            box-shadow: 0 8px 22px -8px rgba(124, 58, 237, .55);
        }

        .btn-primary:hover {
            background: #6d28d9;
            transform: translateY(-2px);
            box-shadow: 0 14px 30px -8px rgba(124, 58, 237, .55);
        }

        .btn-outline {
            border: 1px solid #e2e8f0;
            background: transparent;
            color: #334155;
        }

        .btn-outline:hover {
            border-color: #cbd5e1;
            background: #f8fafc;
            color: #0f172a;
        }

        .footer-link {
            color: #94a3b8;
            transition: color .2s ease;
        }

        .footer-link:hover {
            color: #7c3aed;
        }

        .article-body {
            font-size: 1.0625rem;
            line-height: 1.95;
            color: #334155;
        }

        .article-body h2,
        .article-body h3,
        .article-body h4 {
            color: #0f172a;
            font-weight: 800;
            line-height: 1.4;
            margin: 2.4rem 0 1rem;
        }

        .article-body h2 {
            font-size: 1.7rem;
        }

        .article-body h3 {
            font-size: 1.3rem;
        }

        .article-body h4 {
            font-size: 1.1rem;
        }

        .article-body p {
            margin: 1rem 0;
        }

        .article-body a {
            color: var(--brand);
            text-decoration: underline;
            text-underline-offset: 3px;
        }

        .article-body a:hover {
            color: var(--brand-dark);
        }

        .article-body ul,
        .article-body ol {
            margin: 1.2rem 0;
            padding-left: 1.5rem;
        }

        .article-body ul {
            list-style: disc;
        }

        .article-body ol {
            list-style: decimal;
        }

        .article-body li {
            margin: .5rem 0;
        }

        .article-body blockquote {
            border-left: 4px solid var(--brand);
            background: #faf5ff;
            padding: 1rem 1.4rem;
            border-radius: 0 1rem 1rem 0;
            margin: 1.5rem 0;
            color: #475569;
        }

        .article-body img {
            border-radius: 1.25rem;
            margin: 1.8rem 0;
        }

        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            font-size: .95rem;
            background: #fff;
            border-radius: 1rem;
            overflow: hidden;
        }

        .article-body th {
            text-align: left;
            font-weight: 600;
            background: #f5f3ff;
            color: #0f172a;
        }

        .article-body th,
        .article-body td {
            border: 1px solid #e2e8f0;
            padding: .8rem 1rem;
        }

        .bug-card {
            transition: all .3s ease;
        }

        .bug-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow);
        }

        #mobileDrawer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s ease;
        }

        #mobileDrawer.open {
            max-height: 600px;
        }

        @media (max-width: 1024px) {
            .desktop-nav {
                display: none !important;
            }
        }
        @media (min-width: 1025px) {
            #mobileMenuToggle {
                display: none;
            }
            #mobileDrawer {
                display: none;
            }
        }
        @media (max-width: 640px) {
            .article-body {
                font-size: 1rem;
                line-height: 1.8;
            }
            .article-body h2 {
                font-size: 1.4rem;
            }
        }

/* roulang page: category1 */
:root {
            --brand-50: #eff6ff;
            --brand-100: #dbeafe;
            --brand-200: #bfdbfe;
            --brand-300: #93c5fd;
            --brand-400: #60a5fa;
            --brand-500: #3b82f6;
            --brand-600: #2563eb;
            --brand-700: #1d4ed8;
            --brand-800: #1e40af;
            --brand-900: #1e3a8a;
            --accent-500: #f97316;
            --accent-600: #ea580c;
            --slate-900: #0f172a;
            --slate-800: #1e293b;
            --slate-700: #334155;
            --slate-600: #475569;
            --slate-500: #64748b;
            --slate-400: #94a3b8;
            --slate-300: #cbd5e1;
            --slate-200: #e2e8f0;
            --slate-100: #f1f5f9;
            --slate-50: #f8fafc;
            --white: #ffffff;
            --radius-lg: 1.25rem;
            --radius-md: 1rem;
            --radius-sm: 0.75rem;
            --shadow-sm: 0 6px 16px rgba(15, 23, 42, 0.06);
            --shadow-md: 0 14px 30px rgba(15, 23, 42, 0.08);
            --shadow-lg: 0 24px 60px rgba(15, 23, 42, 0.14);
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            background: var(--slate-50);
            color: var(--slate-700);
            font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

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

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

        .container {
            width: 100%;
            max-width: 1280px;
            margin-right: auto !important;
            margin-left: auto !important;
            padding-right: 1.25rem;
            padding-left: 1.25rem;
        }

        @media (min-width: 768px) {
            .container {
                padding-right: 2rem;
                padding-left: 2rem;
            }
        }

        .nav-link {
            position: relative;
            display: inline-flex;
            align-items: center;
            padding: 0.5rem 0.875rem;
            border-radius: 0.75rem;
            color: var(--slate-600);
            font-size: 0.95rem;
            font-weight: 500;
            transition: background 0.2s, color 0.2s;
        }

        .nav-link:hover {
            color: var(--brand-600);
            background: var(--brand-50);
        }

        .nav-link.active {
            color: var(--brand-700);
            font-weight: 600;
            background: var(--brand-50);
        }

        .nav-link.active::after {
            content: "";
            position: absolute;
            left: 1rem;
            right: 1rem;
            bottom: 0.3rem;
            height: 3px;
            border-radius: 999px;
            background: var(--brand-600);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            border-radius: 0.9rem;
            font-weight: 600;
            font-size: 0.95rem;
            line-height: 1.2;
            padding: 0.75rem 1.25rem;
            border: 0;
            cursor: pointer;
            transition: transform 0.25s, box-shadow 0.25s, background 0.25s, border-color 0.25s;
            white-space: nowrap;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--brand-600), var(--brand-700));
            color: var(--white);
            box-shadow: 0 12px 28px -8px rgba(37, 99, 235, 0.55);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 16px 32px -8px rgba(37, 99, 235, 0.65);
        }

        .btn-outline {
            background: var(--white);
            border: 1px solid var(--slate-200);
            color: var(--slate-700);
            box-shadow: none;
        }

        .btn-outline:hover {
            border-color: var(--brand-300);
            color: var(--brand-700);
            transform: translateY(-1px);
        }

        .hero-chip {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.45rem 1rem;
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.18);
            border-radius: 999px;
            color: rgba(255, 255, 255, 0.9);
            font-size: 0.85rem;
            backdrop-filter: blur(12px);
        }

        .hero-chip i {
            color: #fbbf24;
        }

        .hero-stat {
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.14);
            backdrop-filter: blur(16px);
            border-radius: 1.25rem;
            padding: 1rem 1.2rem;
            transition: background 0.25s, border 0.25s;
        }

        .hero-stat:hover {
            background: rgba(255, 255, 255, 0.13);
            border-color: rgba(255, 255, 255, 0.25);
        }

        .game-card {
            background: var(--white);
            border: 1px solid var(--slate-100);
            border-radius: 1.2rem;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
        }

        .game-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: var(--brand-200);
        }

        .game-card img {
            transition: transform 0.6s ease;
        }

        .game-card:hover img {
            transform: scale(1.06);
        }

        .badge {
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
            border-radius: 999px;
            padding: 0.3rem 0.8rem;
            font-size: 0.75rem;
            font-weight: 600;
            line-height: 1.3;
        }

        .badge-white {
            background: rgba(255, 255, 255, 0.9);
            color: var(--slate-700);
        }

        .badge-orange {
            background: var(--accent-500);
            color: #fff;
        }

        .badge-brand {
            background: var(--brand-600);
            color: #fff;
        }

        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            color: var(--brand-600);
            font-weight: 600;
            font-size: 0.85rem;
            letter-spacing: 0.04em;
            text-transform: none;
        }

        .section-title {
            font-size: clamp(1.8rem, 3vw, 2.6rem);
            line-height: 1.2;
            color: var(--slate-900);
            font-weight: 800;
            letter-spacing: -0.02em;
            margin: 0.75rem 0 0;
        }

        .section-subtitle {
            margin-top: 0.75rem;
            color: var(--slate-500);
            font-size: 1rem;
            line-height: 1.75;
        }

        .card {
            background: var(--white);
            border: 1px solid var(--slate-100);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
        }

        .feature-card {
            padding: 1.5rem;
            background: var(--white);
            border: 1px solid var(--slate-100);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
        }

        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--brand-200);
        }

        .feature-icon {
            width: 3rem;
            height: 3rem;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 1rem;
            background: linear-gradient(135deg, var(--brand-500), var(--brand-700));
            color: #fff;
            font-size: 1.25rem;
            box-shadow: 0 10px 20px -8px rgba(37, 99, 235, 0.6);
        }

        .footer-link {
            color: var(--slate-400);
            transition: color 0.2s, padding-left 0.2s;
        }

        .footer-link:hover {
            color: #fff;
            padding-left: 4px;
        }

        .step-card {
            border: 1px solid var(--slate-100);
            background: var(--slate-50);
            border-radius: var(--radius-lg);
            padding: 1.5rem;
            position: relative;
            transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
        }

        .step-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: var(--brand-200);
        }

        .step-number {
            color: transparent;
            -webkit-text-stroke: 2px var(--brand-300);
            font-weight: 900;
            line-height: 1;
            font-size: 3rem;
        }

        .voice-card {
            background: var(--white);
            border: 1px solid var(--slate-100);
            border-radius: var(--radius-lg);
            padding: 1.5rem;
            height: 100%;
            box-shadow: var(--shadow-sm);
            transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
        }

        .voice-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-md);
            border-color: var(--brand-200);
        }

        .faq-item {
            background: var(--white);
            border: 1px solid var(--slate-100);
            border-radius: 1rem;
            box-shadow: var(--shadow-sm);
            transition: border-color 0.2s;
        }

        .faq-item:hover {
            border-color: var(--brand-200);
        }

        .faq-item summary {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            padding: 1.2rem 1.4rem;
            cursor: pointer;
            list-style: none;
            border-radius: 1rem;
            color: var(--slate-800);
            font-weight: 600;
            transition: color 0.2s;
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-item summary i {
            flex-shrink: 0;
            color: var(--brand-600);
            transition: transform 0.2s;
        }

        .faq-item details[open] summary i {
            transform: rotate(180deg);
        }

        .faq-item details[open] summary {
            color: var(--brand-700);
        }

        .faq-item p {
            padding: 0 1.4rem 1.35rem;
            color: var(--slate-500);
            font-size: 0.95rem;
            line-height: 1.8;
        }

        .cta-pulse {
            animation: ctaPulse 2.6s ease-in-out infinite;
        }

        @keyframes ctaPulse {
            0%,
            100% {
                box-shadow: 0 12px 32px -8px rgba(249, 115, 22, 0.6);
            }
            50% {
                box-shadow: 0 12px 38px -4px rgba(249, 115, 22, 0.8);
            }
        }

        @media (max-width: 767px) {
            .nav-link.active::after {
                left: 0.6rem;
                right: auto;
                width: 3px;
                height: 60%;
                top: 50%;
                transform: translateY(-50%);
            }

            .feature-card {
                padding: 1.2rem;
            }
        }

        @media (max-width: 520px) {
            .hero-stat {
                padding: 0.8rem;
                border-radius: 1rem;
            }

            .container {
                padding-right: 1rem;
                padding-left: 1rem;
            }
        }

/* roulang page: category2 */
:root {
            --brand: #4f46e5;
            --brand-soft: #eef2ff;
            --brand-dark: #3730a3;
            --ring: rgba(79, 70, 229, .35);
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            background: #ffffff;
            color: #1e293b;
            line-height: 1.7;
        }

        ::selection {
            background: #c7d2fe;
            color: #1e1b4b;
        }

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

        .container {
            width: 100%;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1rem;
            padding-right: 1rem;
        }

        @media (min-width: 768px) {
            .container {
                padding-left: 1.5rem;
                padding-right: 1.5rem;
            }
        }

        .desktop-nav {
            gap: .35rem;
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: .55rem .9rem;
            border-radius: .75rem;
            font-size: .92rem;
            font-weight: 500;
            color: #475569;
            white-space: nowrap;
            transition: all .25s ease;
            border: 1px solid transparent;
        }

        .nav-link:hover {
            color: #4338ca;
            background: #eef2ff;
            transform: translateY(-1px);
        }

        .nav-link.active {
            color: #4338ca;
            background: #e0e7ff;
            box-shadow: 0 2px 8px rgba(79, 70, 229, .12);
        }

        .footer-link {
            display: inline-flex;
            align-items: center;
            transition: color .25s ease, transform .25s ease;
        }

        .footer-link i {
            font-size: 12px;
            margin-right: 6px;
        }

        .footer-link:hover {
            color: #c7d2fe !important;
            transform: translateX(3px);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: .5rem;
            padding: .8rem 1.35rem;
            border-radius: .9rem;
            font-weight: 600;
            font-size: .95rem;
            line-height: 1.2;
            text-decoration: none;
            transition: all .25s ease;
            border: 1px solid transparent;
            cursor: pointer;
        }

        .btn:focus-visible,
        .nav-link:focus-visible,
        .footer-link:focus-visible,
        a:focus-visible {
            outline: none;
            box-shadow: 0 0 0 4px var(--ring);
        }

        .btn-primary {
            background: linear-gradient(135deg, #4f46e5 0%, #6d28d9 100%);
            color: #fff;
            box-shadow: 0 8px 20px rgba(79, 70, 229, .28);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(79, 70, 229, .38);
            color: #fff;
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 4px 12px rgba(79, 70, 229, .3);
        }

        .btn-accent {
            background: linear-gradient(135deg, #f59e0b 0%, #ea580c 100%);
            color: #fff;
            box-shadow: 0 8px 20px rgba(234, 88, 12, .25);
        }

        .btn-accent:hover {
            transform: translateY(-2px);
            color: #fff;
            box-shadow: 0 12px 26px rgba(234, 88, 12, .32);
        }

        .btn-soft {
            background: #eef2ff;
            color: #4338ca;
            border-color: #e0e7ff;
        }

        .btn-soft:hover {
            background: #e0e7ff;
            color: #3730a3;
            transform: translateY(-2px);
        }

        .btn-white {
            background: #fff;
            color: #1e293b;
            border-color: #e2e8f0;
            box-shadow: 0 6px 16px rgba(2, 6, 23, .18);
        }

        .btn-white:hover {
            background: #f8fafc;
            color: #4338ca;
            transform: translateY(-2px);
        }

        .btn-lg {
            padding: 1rem 1.8rem;
            font-size: 1.05rem;
        }

        .hero-back {
            background-image: linear-gradient(120deg, rgba(15, 23, 42, .84) 0%, rgba(30, 27, 75, .66) 58%, rgba(67, 56, 202, .58) 100%), url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
        }

        .deep-back {
            background-image: linear-gradient(135deg, rgba(15, 23, 42, .94), rgba(30, 27, 75, .86)), url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
        }

        .cta-back {
            background-image: linear-gradient(135deg, #4f46e5 0%, #6d28d9 45%, #9333ea 100%), url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
        }

        .icon-square {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 3rem;
            height: 3rem;
            border-radius: 1rem;
            font-size: 1.25rem;
            flex-shrink: 0;
        }

        .hover-lift {
            transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
        }

        .hover-lift:hover {
            transform: translateY(-6px);
            box-shadow: 0 20px 40px rgba(2, 6, 23, .08);
        }

        .security-panel {
            position: relative;
            background: rgba(255, 255, 255, .96);
            border: 1px solid rgba(255, 255, 255, .6);
            border-radius: 2rem;
            box-shadow: 0 30px 80px rgba(2, 6, 23, .32);
            backdrop-filter: blur(12px);
        }

        .pulse-dot {
            position: relative;
            width: 8px;
            height: 8px;
            border-radius: 999px;
            background: #10b981;
        }

        .pulse-dot::after {
            content: '';
            position: absolute;
            inset: -4px;
            border-radius: 999px;
            background: rgba(16, 185, 129, .38);
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0% {
                transform: scale(.55);
                opacity: .85;
            }
            70% {
                transform: scale(1.6);
                opacity: 0;
            }
            100% {
                opacity: 0;
            }
        }

        .step-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
            position: relative;
        }

        .step-line {
            position: absolute;
            top: 34px;
            left: 12%;
            right: 12%;
            height: 2px;
            background: linear-gradient(90deg, #c7d2fe, #818cf8, #c7d2fe);
            border-radius: 999px;
            z-index: 0;
        }

        .stat-card {
            border-radius: 1.25rem;
            border: 1px solid #e2e8f0;
            background: #fff;
        }

        .badge-chip {
            display: inline-flex;
            align-items: center;
            gap: .5rem;
            border-radius: 999px;
            padding: .45rem 1rem;
            font-size: .85rem;
            background: rgba(255, 255, 255, .12);
            border: 1px solid rgba(255, 255, 255, .22);
            color: #fff;
            backdrop-filter: blur(6px);
        }

        .scenario-card {
            border-radius: 1.5rem;
            background: #fff;
            border: 1px solid #e2e8f0;
            overflow: hidden;
            transition: all .3s ease;
        }

        .scenario-card:hover {
            border-color: #c7d2fe;
            box-shadow: 0 22px 42px rgba(30, 27, 75, .09);
            transform: translateY(-5px);
        }

        .faq-item {
            background: #fff;
            border: 1px solid #e2e8f0;
            border-radius: 1.25rem;
            overflow: hidden;
            transition: border-color .3s ease, box-shadow .3s ease;
        }

        .faq-item[open] {
            border-color: #c7d2fe;
            box-shadow: 0 12px 30px rgba(79, 70, 229, .07);
        }

        .faq-item summary {
            list-style: none;
            cursor: pointer;
            padding: 1.1rem 1.25rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            font-weight: 600;
            color: #1e293b;
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-item summary .faq-icon {
            width: 2rem;
            height: 2rem;
            border-radius: .7rem;
            display: flex;
            align-items: center;
            justify-content: center;
            background: #eef2ff;
            color: #4f46e5;
            font-size: .85rem;
            transition: all .35s ease;
            flex-shrink: 0;
        }

        .faq-item[open] summary .faq-icon {
            background: #4f46e5;
            color: #fff;
            transform: rotate(45deg);
        }

        .faq-answer {
            padding: 0 1.25rem 1.3rem;
            color: #64748b;
            font-size: .94rem;
            line-height: 1.8;
        }

        .section-muted {
            background: #f8fafc;
        }

        .grid-pattern {
            background-image: linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px);
            background-size: 32px 32px;
        }

        @media (max-width: 1024px) {
            .step-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 1.2rem;
            }
            .step-line {
                display: none;
            }
        }

        @media (max-width: 640px) {
            .step-grid {
                grid-template-columns: 1fr;
            }
            .btn {
                padding: .75rem 1rem;
            }
            .security-panel {
                border-radius: 1.4rem;
            }
        }

/* roulang page: category3 */
:root {
            --brand: #2f4be0;
            --brand-dark: #22339c;
            --body: #334155;
            --muted: #64748b;
            --line: #eef2f7;
            --night: #0f172a;
            --radius: 1rem;
            --shadow: 0 12px 40px -16px rgba(15, 23, 42, 0.18);
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            margin: 0;
            color: var(--body);
            background: #fff;
            font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            color: inherit;
            text-decoration: none;
        }

        button,
        input {
            font-family: inherit;
            font-size: inherit;
        }

        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding-left: 1rem;
            padding-right: 1rem;
        }

        @media (min-width: 640px) {
            .container {
                padding-left: 1.5rem;
                padding-right: 1.5rem;
            }
        }

        .text-gradient {
            background: linear-gradient(115deg, #2539c0 0%, #2f4be0 48%, #7c8cf8 100%);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            color: transparent;
        }

        .eyebrow {
            letter-spacing: 0.08em;
            text-transform: uppercase;
        }

        .section-title {
            font-size: clamp(1.9rem, 4vw, 2.6rem);
            line-height: 1.25;
            font-weight: 700;
            color: #0f172a;
        }

        .section-desc {
            font-size: 1.0625rem;
            color: var(--muted);
            line-height: 1.8;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.55rem;
            border-radius: 0.875rem;
            font-weight: 600;
            line-height: 1;
            padding: 0.9rem 1.6rem;
            transition: all 0.25s ease;
            border: 1px solid transparent;
            cursor: pointer;
            white-space: nowrap;
        }

        .btn-primary {
            background: var(--brand);
            color: #fff;
            box-shadow: 0 10px 24px -10px rgba(47, 75, 224, 0.65);
        }

        .btn-primary:hover {
            background: #1d35b8;
            transform: translateY(-2px);
            box-shadow: 0 16px 30px -12px rgba(47, 75, 224, 0.7);
        }

        .btn-outline {
            background: #fff;
            color: #0f172a;
            border-color: #e2e8f0;
        }

        .btn-outline:hover {
            background: #f8fafc;
            border-color: var(--brand);
            color: var(--brand);
            transform: translateY(-2px);
        }

        .btn-light {
            background: #fff;
            color: #0f172a;
        }

        .btn-light:hover {
            background: #eef2ff;
            transform: translateY(-2px);
            box-shadow: 0 12px 30px -12px rgba(2, 6, 23, 0.5);
        }

        .btn-dark-outline {
            background: rgba(255, 255, 255, 0.06);
            color: #fff;
            border-color: rgba(255, 255, 255, 0.25);
            backdrop-filter: blur(8px);
        }

        .btn-dark-outline:hover {
            background: rgba(255, 255, 255, 0.14);
            border-color: rgba(255, 255, 255, 0.45);
            transform: translateY(-2px);
        }

        .btn:focus-visible,
        .nav-link:focus-visible {
            outline: 3px solid rgba(47, 75, 224, 0.25);
            outline-offset: 2px;
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0.5rem 0.85rem;
            border-radius: 0.8rem;
            font-weight: 500;
            color: #475569;
            transition: color 0.2s, background 0.2s;
        }

        .nav-link:hover {
            color: var(--brand);
            background: rgba(47, 75, 224, 0.05);
        }

        .nav-link.active {
            color: var(--brand);
            background: rgba(47, 75, 224, 0.08);
            font-weight: 600;
        }

        .footer-link {
            color: #94a3b8;
            transition: color 0.2s;
        }

        .footer-link:hover {
            color: #fff;
        }

        .hover-lift {
            transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease, background 0.3s ease;
        }

        .hover-lift:hover {
            transform: translateY(-6px);
            box-shadow: 0 24px 50px -24px rgba(15, 23, 42, 0.28);
        }

        .level-card {
            transition: transform 0.3s ease, border-color 0.3s ease, background 0.3s ease;
        }

        .level-card:hover {
            transform: translateY(-6px);
            border-color: rgba(255, 255, 255, 0.35);
            background: rgba(255, 255, 255, 0.1);
        }

        .faq-item {
            background: #fff;
            border: 1px solid #eef2f7;
            border-radius: 1rem;
            box-shadow: 0 2px 10px rgba(15, 23, 42, 0.03);
            margin-bottom: 0.8rem;
            overflow: hidden;
            transition: border-color 0.2s, box-shadow 0.2s;
        }

        .faq-item:hover {
            border-color: #cdd7ff;
            box-shadow: 0 12px 30px -18px rgba(47, 75, 224, 0.25);
        }

        .faq-item summary {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1.5rem;
            padding: 1.25rem 1.5rem;
            font-weight: 600;
            color: #0f172a;
            cursor: pointer;
            list-style: none;
            line-height: 1.5;
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-item summary::after {
            content: '\f078';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: 0.85rem;
            color: #2f4be0;
            background: #eef2ff;
            border-radius: 50%;
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            transition: transform 0.3s ease;
        }

        .faq-item[open] summary::after {
            transform: rotate(180deg);
        }

        .faq-item>div {
            padding: 0 1.5rem 1.5rem;
            color: #64748b;
            line-height: 1.85;
        }

        .check-list li {
            display: flex;
            gap: 0.75rem;
            align-items: flex-start;
        }

        .check-list i {
            color: #2f4be0;
            font-size: 0.9rem;
            margin-top: 0.3rem;
        }

        @media (prefers-reduced-motion: reduce) {
            *,
            *::before,
            *::after {
                animation: none !important;
                transition: none !important;
                scroll-behavior: auto !important;
            }
        }

        @media (max-width: 640px) {
            .btn {
                padding: 0.8rem 1.1rem;
            }
            .nav-link {
                justify-content: flex-start;
            }
        }