/* roulang page: index */
:root {
            --primary: #4f46e5;
            --primary-light: #6366f1;
            --primary-dark: #3730a3;
            --accent: #f59e0b;
            --text-main: #1e293b;
            --text-muted: #64748b;
            --bg-body: #f8fafc;
            --bg-card: #ffffff;
            --radius-lg: 1.25rem;
            --radius-md: 0.75rem;
            --radius-sm: 0.5rem;
            --shadow-card: 0 4px 24px rgba(79, 70, 229, 0.08);
            --shadow-hover: 0 12px 32px rgba(79, 70, 229, 0.16);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            line-height: 1.7;
            color: var(--text-main);
            background-color: var(--bg-body);
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.25rem;
        }

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

        img {
            max-width: 100%;
            height: auto;
            object-fit: cover;
        }

        button,
        input {
            font-family: inherit;
            border: none;
            outline: none;
        }

        .logo-text {
            font-weight: 800;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .header-nav {
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(100, 116, 139, 0.1);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 12px rgba(15, 23, 42, 0.04);
        }

        .nav-link {
            padding: 0.5rem 1.1rem;
            border-radius: 9999px;
            font-weight: 500;
            font-size: 0.9rem;
            transition: all 0.2s ease;
            color: #475569;
            white-space: nowrap;
        }

        .nav-link:hover {
            background: #eef2ff;
            color: #4f46e5;
        }

        .nav-link.active {
            background: #4f46e5;
            color: #ffffff;
        }

        .btn-primary {
            background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
            color: #ffffff;
            padding: 0.7rem 1.6rem;
            border-radius: 9999px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all 0.3s ease;
            box-shadow: 0 4px 16px rgba(79, 70, 229, 0.35);
            display: inline-block;
            text-align: center;
            white-space: nowrap;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(79, 70, 229, 0.4);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(79, 70, 229, 0.3);
        }

        .btn-outline {
            background: transparent;
            color: #4f46e5;
            border: 1.5px solid #c7d2fe;
            padding: 0.7rem 1.6rem;
            border-radius: 9999px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all 0.3s ease;
            display: inline-block;
            text-align: center;
            white-space: nowrap;
        }

        .btn-outline:hover {
            border-color: #4f46e5;
            background: #eef2ff;
        }

        .btn-outline:active {
            background: #e0e7ff;
        }

        .hero-section {
            position: relative;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            overflow: hidden;
            min-height: 560px;
            display: flex;
            align-items: center;
        }

        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(110deg, rgba(15, 23, 42, 0.9) 0%, rgba(49, 46, 129, 0.8) 50%, rgba(79, 70, 229, 0.55) 100%);
        }

        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 1.75rem;
            border: 1px solid rgba(100, 116, 139, 0.08);
            box-shadow: var(--shadow-card);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
        }

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

        .feature-icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.125rem;
        }

        .category-card {
            border-radius: var(--radius-lg);
            padding: 2rem 1.75rem;
            background: var(--bg-card);
            border: 1px solid rgba(100, 116, 139, 0.08);
            box-shadow: var(--shadow-card);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

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

        .cat-badge {
            display: inline-block;
            padding: 0.25rem 1rem;
            border-radius: 9999px;
            font-size: 0.8rem;
            font-weight: 600;
            background: #eef2ff;
            color: #4f46e5;
            margin-bottom: 1rem;
        }

        .data-block {
            background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
            border-radius: var(--radius-lg);
            padding: 2.5rem 2rem;
            color: #fff;
            position: relative;
            overflow: hidden;
        }

        .data-item {
            text-align: center;
        }

        .data-number {
            font-size: 2.8rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            color: #fbbf24;
        }

        .news-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 1.5rem;
            transition: all 0.3s ease;
            border: 1px solid rgba(100, 116, 139, 0.08);
            height: 100%;
        }

        .news-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: #c7d2fe;
        }

        .news-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 0.2rem 0.8rem;
            border-radius: 9999px;
            background: #f1f5f9;
            color: #64748b;
            margin-right: 0.5rem;
        }

        .faq-item {
            border: 1px solid rgba(100, 116, 139, 0.12);
            border-radius: var(--radius-md);
            padding: 1.25rem 1.5rem;
            background: var(--bg-card);
            transition: border-color 0.3s ease, box-shadow 0.3s ease;
        }

        .faq-item:hover {
            border-color: #c7d2fe;
            box-shadow: 0 4px 16px rgba(79, 70, 229, 0.06);
        }

        .faq-question {
            font-weight: 700;
            font-size: 1rem;
            margin-bottom: 0.35rem;
            color: var(--text-main);
        }

        .faq-answer {
            color: var(--text-muted);
            font-size: 0.92rem;
            line-height: 1.7;
        }

        .cta-section {
            background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 60%, #9333ea 100%);
            border-radius: var(--radius-lg);
            padding: 3rem 2rem;
            color: #fff;
            text-align: center;
        }

        .footer {
            background: #0f172a;
            color: #cbd5e1;
            padding-top: 3.5rem;
            padding-bottom: 1.5rem;
        }

        .footer a {
            color: #94a3b8;
            transition: color 0.2s ease;
        }

        .footer a:hover {
            color: #fbbf24;
        }

        .mobile-menu-btn {
            display: none;
        }

        .mobile-menu {
            display: none;
            flex-direction: column;
            padding: 1rem 1.25rem;
            background: #fff;
            border-top: 1px solid rgba(100, 116, 139, 0.1);
        }

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

        .mobile-menu a {
            padding: 0.8rem 0;
            border-bottom: 1px solid rgba(100, 116, 139, 0.08);
            font-weight: 500;
            color: #334155;
        }

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

        .mobile-menu a.active {
            color: #4f46e5;
            font-weight: 600;
        }

        .flow-step {
            position: relative;
            padding-left: 2.5rem;
            padding-bottom: 2rem;
            border-left: 2px dashed #e0e7ff;
        }

        .flow-step:last-child {
            border-left: none;
        }

        .flow-step::before {
            content: '';
            position: absolute;
            left: -0.45rem;
            top: 0.2rem;
            width: 0.9rem;
            height: 0.9rem;
            border-radius: 50%;
            background: #4f46e5;
            border: 2px solid #fff;
            box-shadow: 0 0 0 3px #e0e7ff;
        }

        .flow-step:last-child::before {
            background: #f59e0b;
        }

        .tip-box {
            background: #fefce8;
            border: 1px solid #fde047;
            border-radius: var(--radius-md);
            padding: 1.25rem 1.5rem;
            font-size: 0.95rem;
            color: #854d0e;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            color: var(--text-main);
            margin-bottom: 0.5rem;
        }

        .section-subtitle {
            color: var(--text-muted);
            font-size: 1rem;
            max-width: 720px;
        }

        .section-padding {
            padding: 5rem 0;
        }

        @media (max-width: 1024px) {
            .hero-section {
                min-height: 480px;
            }
            .section-title {
                font-size: 1.75rem;
            }
        }

        @media (max-width: 768px) {
            .desktop-nav {
                display: none;
            }
            .mobile-menu-btn {
                display: block;
            }
            .hero-section {
                min-height: 420px;
            }
            .hero-title {
                font-size: 1.8rem;
                line-height: 1.3;
            }
            .section-padding {
                padding: 3.5rem 0;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .data-number {
                font-size: 2rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 1rem;
            }
            .hero-section {
                min-height: 380px;
            }
            .feature-card {
                padding: 1.25rem;
            }
            .btn-primary,
            .btn-outline {
                padding: 0.6rem 1.2rem;
                font-size: 0.88rem;
            }
            .data-block {
                padding: 1.75rem 1rem;
            }
        }

        button:focus-visible,
        a:focus-visible {
            outline: 2px solid #4f46e5;
            outline-offset: 2px;
        }

/* roulang page: category1 */
:root {
            --primary: #0f766e;
            --primary-dark: #115e59;
            --primary-light: #14b8a6;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --deep: #134e4a;
            --bg: #f8fafc;
            --card-bg: #ffffff;
            --text: #0f172a;
            --text-weak: #64748b;
            --border: #e2e8f0;
            --radius: 1rem;
            --shadow: 0 4px 20px rgba(15, 118, 110, 0.08);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

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

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

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            border: none;
            outline: none;
            background: none;
        }

        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .header-nav {
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.6);
            position: sticky;
            top: 0;
            z-index: 100;
            transition: var(--transition);
        }

        .header-nav.scrolled {
            box-shadow: 0 4px 24px rgba(15, 118, 110, 0.08);
        }

        .logo-text {
            background: linear-gradient(135deg, #0f766e 0%, #14b8a6 50%, #0f766e 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            font-weight: 800;
            letter-spacing: -0.02em;
        }

        .desktop-nav .nav-link {
            position: relative;
            padding: 8px 18px;
            font-size: 14.5px;
            font-weight: 500;
            color: #475569;
            border-radius: 10px;
            transition: var(--transition);
        }

        .desktop-nav .nav-link:hover {
            color: var(--primary);
            background: rgba(15, 118, 110, 0.08);
        }

        .desktop-nav .nav-link.active {
            color: var(--primary);
            background: rgba(15, 118, 110, 0.1);
            font-weight: 600;
        }

        .desktop-nav .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            border-radius: 99px;
            background: var(--primary);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 22px;
            background: linear-gradient(135deg, #0f766e, #14b8a6);
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            border-radius: 12px;
            transition: var(--transition);
            box-shadow: 0 4px 14px rgba(15, 118, 110, 0.3);
            cursor: pointer;
            border: none;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(15, 118, 110, 0.35);
            color: #fff;
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 22px;
            background: #fff;
            color: var(--primary);
            font-size: 14px;
            font-weight: 600;
            border-radius: 12px;
            border: 1.5px solid rgba(15, 118, 110, 0.2);
            transition: var(--transition);
            cursor: pointer;
        }

        .btn-secondary:hover {
            border-color: var(--primary);
            background: rgba(15, 118, 110, 0.04);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(15, 118, 110, 0.12);
        }

        .mobile-menu-btn {
            transition: var(--transition);
        }

        .mobile-menu-btn:hover {
            background: rgba(15, 118, 110, 0.08) !important;
        }

        .mobile-menu {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            background: #fff;
            border-bottom: 1px solid var(--border);
            box-shadow: 0 16px 40px rgba(15, 23, 42, 0.1);
            padding: 16px 24px 24px;
            z-index: 99;
            border-radius: 0 0 20px 20px;
        }

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

        .mobile-menu a {
            display: block;
            padding: 13px 16px;
            border-radius: 12px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text);
            transition: var(--transition);
        }

        .mobile-menu a:hover {
            background: rgba(15, 118, 110, 0.08);
            color: var(--primary);
        }

        .mobile-menu a.active {
            background: rgba(15, 118, 110, 0.1);
            color: var(--primary);
            font-weight: 600;
        }

        .category-hero {
            background: linear-gradient(135deg, #0f3d3a 0%, #134e4a 35%, #0f766e 70%, #14b8a6 100%);
            position: relative;
            overflow: hidden;
            padding: 90px 0 110px;
        }

        .category-hero::before {
            content: '';
            position: absolute;
            top: -40%;
            right: -10%;
            width: 600px;
            height: 600px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(20, 184, 166, 0.25) 0%, transparent 70%);
            pointer-events: none;
        }

        .category-hero::after {
            content: '';
            position: absolute;
            bottom: -30%;
            left: -10%;
            width: 500px;
            height: 500px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(245, 158, 11, 0.18) 0%, transparent 70%);
            pointer-events: none;
        }

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

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.65);
            margin-bottom: 20px;
        }

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

        .breadcrumb .separator {
            opacity: 0.5;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 8px 18px;
            background: rgba(255, 255, 255, 0.12);
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 99px;
            color: #fff;
            font-size: 13px;
            font-weight: 500;
            backdrop-filter: blur(8px);
            margin-bottom: 24px;
        }

        .hero-badge .dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: #34d399;
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0%, 100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.5;
                transform: scale(0.8);
            }
        }

        .category-hero h1 {
            font-size: 44px;
            line-height: 1.2;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.02em;
            margin-bottom: 20px;
            max-width: 760px;
        }

        .category-hero .hero-desc {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.82);
            max-width: 680px;
            line-height: 1.8;
            margin-bottom: 32px;
        }

        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            margin-top: 12px;
        }

        .hero-stat {
            display: flex;
            flex-direction: column;
        }

        .hero-stat .num {
            font-size: 30px;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
        }

        .hero-stat .label {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.65);
            margin-top: 4px;
        }

        .section {
            padding: 84px 0;
        }

        .section-alt {
            background: #fff;
            border-top: 1px solid rgba(226, 232, 240, 0.4);
            border-bottom: 1px solid rgba(226, 232, 240, 0.4);
        }

        .section-head {
            max-width: 720px;
            margin: 0 auto 56px;
            text-align: center;
        }

        .section-head .tag {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(15, 118, 110, 0.08);
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
            border-radius: 99px;
            margin-bottom: 16px;
            letter-spacing: 0.02em;
        }

        .section-head h2 {
            font-size: 34px;
            font-weight: 800;
            color: #0f172a;
            letter-spacing: -0.02em;
            line-height: 1.3;
            margin-bottom: 14px;
        }

        .section-head p {
            font-size: 15.5px;
            color: var(--text-weak);
            line-height: 1.8;
        }

        .method-card {
            background: #fff;
            border-radius: 1.25rem;
            padding: 32px 28px;
            border: 1px solid rgba(226, 232, 240, 0.6);
            box-shadow: var(--shadow);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
            height: 100%;
        }

        .method-card::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, #0f766e, #14b8a6);
            opacity: 0;
            transition: var(--transition);
        }

        .method-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover, 0 12px 32px rgba(15, 118, 110, 0.16));
            border-color: rgba(15, 118, 110, 0.2);
        }

        .method-card:hover::after {
            opacity: 1;
        }

        .method-icon {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            margin-bottom: 20px;
            background: linear-gradient(135deg, rgba(15, 118, 110, 0.1), rgba(20, 184, 166, 0.1));
            color: var(--primary);
        }

        .method-card h3 {
            font-size: 19px;
            font-weight: 700;
            color: #0f172a;
            margin-bottom: 10px;
        }

        .method-card p {
            font-size: 14px;
            color: var(--text-weak);
            line-height: 1.8;
        }

        .method-steps {
            margin-top: 18px;
            padding-top: 18px;
            border-top: 1px dashed var(--border);
        }

        .method-steps ol {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .method-steps li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            padding: 6px 0;
            font-size: 13.5px;
            color: #475569;
        }

        .method-steps li .step-num {
            flex-shrink: 0;
            width: 22px;
            height: 22px;
            border-radius: 50%;
            background: rgba(15, 118, 110, 0.1);
            color: var(--primary);
            font-size: 11px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-top: 2px;
        }

        .steps-section {
            background: #0f3d3a;
            position: relative;
            overflow: hidden;
            padding: 90px 0;
        }

        .steps-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(135deg, rgba(15, 118, 110, 0.4), transparent);
            pointer-events: none;
        }

        .steps-section .container {
            position: relative;
            z-index: 2;
        }

        .steps-section .section-head h2 {
            color: #fff;
        }

        .steps-section .section-head p {
            color: rgba(255, 255, 255, 0.75);
        }

        .steps-section .section-head .tag {
            background: rgba(20, 184, 166, 0.15);
            color: #34d399;
        }

        .step-item {
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 1.25rem;
            padding: 28px 24px;
            backdrop-filter: blur(4px);
            transition: var(--transition);
            height: 100%;
            position: relative;
        }

        .step-item:hover {
            background: rgba(255, 255, 255, 0.1);
            transform: translateY(-4px);
        }

        .step-number {
            font-size: 36px;
            font-weight: 800;
            color: rgba(52, 211, 153, 0.5);
            line-height: 1;
            margin-bottom: 16px;
            font-family: 'SF Pro Display', system-ui, sans-serif;
        }

        .step-item h3 {
            color: #fff;
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .step-item p {
            color: rgba(255, 255, 255, 0.7);
            font-size: 13.5px;
            line-height: 1.8;
        }

        .tip-box {
            background: rgba(245, 158, 11, 0.1);
            border: 1px solid rgba(245, 158, 11, 0.2);
            border-radius: 1rem;
            padding: 18px 20px;
            margin-top: 20px;
            display: flex;
            gap: 14px;
        }

        .tip-box .tip-icon {
            color: #f59e0b;
            font-size: 18px;
            flex-shrink: 0;
            margin-top: 2px;
        }

        .tip-box p {
            font-size: 13.5px;
            color: rgba(255, 255, 255, 0.8);
            line-height: 1.8;
        }

        .tip-box strong {
            color: #fbbf24;
        }

        .trouble-card {
            background: #fff;
            border-radius: 1.25rem;
            padding: 28px;
            border: 1px solid rgba(226, 232, 240, 0.6);
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
        }

        .trouble-card:hover {
            box-shadow: var(--shadow-hover, 0 12px 32px rgba(15, 118, 110, 0.12));
            border-color: rgba(15, 118, 110, 0.15);
        }

        .trouble-card .icon-wrap {
            width: 50px;
            height: 50px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            margin-bottom: 18px;
            background: linear-gradient(135deg, #fef3c7, #fde68a);
            color: #d97706;
        }

        .trouble-card .icon-wrap.green {
            background: linear-gradient(135deg, #d1fae5, #a7f3d0);
            color: #059669;
        }

        .trouble-card .icon-wrap.blue {
            background: linear-gradient(135deg, #dbeafe, #bfdbfe);
            color: #2563eb;
        }

        .trouble-card .icon-wrap.red {
            background: linear-gradient(135deg, #fee2e2, #fecaca);
            color: #dc2626;
        }

        .trouble-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: #0f172a;
            margin-bottom: 8px;
        }

        .trouble-card p {
            font-size: 13.5px;
            color: var(--text-weak);
            line-height: 1.8;
        }

        .security-section {
            background: linear-gradient(135deg, #f0fdfa, #f8fafc);
            border-top: 1px solid rgba(226, 232, 240, 0.4);
            border-bottom: 1px solid rgba(226, 232, 240, 0.4);
        }

        .security-item {
            display: flex;
            align-items: flex-start;
            gap: 16px;
            padding: 20px;
            background: #fff;
            border-radius: 1rem;
            border: 1px solid var(--border);
            transition: var(--transition);
        }

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

        .security-item .icon {
            width: 44px;
            height: 44px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            background: rgba(15, 118, 110, 0.1);
            color: var(--primary);
            flex-shrink: 0;
        }

        .security-item h4 {
            font-size: 15px;
            font-weight: 700;
            color: #0f172a;
            margin-bottom: 4px;
        }

        .security-item p {
            font-size: 13px;
            color: var(--text-weak);
            line-height: 1.7;
        }

        .faq-section {
            background: #fff;
        }

        .faq-list {
            max-width: 860px;
            margin: 0 auto;
        }

        .faq-item {
            background: #f8fafc;
            border: 1px solid rgba(226, 232, 240, 0.7);
            border-radius: 1rem;
            margin-bottom: 14px;
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item:hover {
            border-color: rgba(15, 118, 110, 0.25);
            box-shadow: 0 4px 16px rgba(15, 118, 110, 0.06);
        }

        .faq-item input[type="checkbox"] {
            display: none;
        }

        .faq-item label {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 20px 24px;
            cursor: pointer;
            font-size: 15.5px;
            font-weight: 600;
            color: #0f172a;
            transition: var(--transition);
        }

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

        .faq-item label .arrow {
            width: 30px;
            height: 30px;
            border-radius: 50%;
            background: rgba(15, 118, 110, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 13px;
            color: var(--primary);
            transition: var(--transition);
            flex-shrink: 0;
        }

        .faq-item .answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.3s ease;
            padding: 0 24px;
            font-size: 14px;
            color: var(--text-weak);
            line-height: 1.8;
            background: #fff;
            border-top: 0 solid transparent;
        }

        .faq-item input[type="checkbox"]:checked~label .arrow {
            transform: rotate(45deg);
            background: var(--primary);
            color: #fff;
        }

        .faq-item input[type="checkbox"]:checked~.answer {
            max-height: 400px;
            padding: 4px 24px 22px;
            border-top-width: 1px;
            border-top-color: var(--border);
        }

        .cta-section {
            padding: 80px 0;
            position: relative;
            background: linear-gradient(135deg, #0f3d3a, #134e4a, #0f766e);
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image: url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
            opacity: 0.12;
            pointer-events: none;
        }

        .cta-section .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }

        .cta-section h2 {
            font-size: 32px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 14px;
        }

        .cta-section p {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.8);
            max-width: 560px;
            margin: 0 auto 28px;
            line-height: 1.8;
        }

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

        .cta-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: 14px;
            font-size: 15px;
            font-weight: 600;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }

        .cta-btn-primary {
            background: #fff;
            color: #0f766e;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
        }

        .cta-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            color: #115e59;
        }

        .cta-btn-ghost {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            border: 1.5px solid rgba(255, 255, 255, 0.3);
            backdrop-filter: blur(8px);
        }

        .cta-btn-ghost:hover {
            background: rgba(255, 255, 255, 0.2);
            transform: translateY(-3px);
        }

        .footer {
            background: #0f172a;
            padding: 64px 0 32px;
        }

        .footer a {
            color: #94a3b8;
            transition: var(--transition);
        }

        .footer a:hover {
            color: #34d399;
        }

        @media (max-width: 1024px) {
            .category-hero {
                padding: 70px 0 90px;
            }
            .category-hero h1 {
                font-size: 36px;
            }
            .section {
                padding: 64px 0;
            }
            .section-head {
                margin-bottom: 40px;
            }
            .section-head h2 {
                font-size: 28px;
            }
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 18px;
            }
            .category-hero {
                padding: 50px 0 70px;
            }
            .category-hero h1 {
                font-size: 28px;
            }
            .category-hero .hero-desc {
                font-size: 15px;
            }
            .hero-stats {
                gap: 24px;
            }
            .hero-stat .num {
                font-size: 24px;
            }
            .section {
                padding: 50px 0;
            }
            .section-head h2 {
                font-size: 24px;
            }
            .section-head p {
                font-size: 14px;
            }
            .cta-section h2 {
                font-size: 24px;
            }
        }

        @media (max-width: 520px) {
            .category-hero h1 {
                font-size: 24px;
            }
            .hero-badge {
                font-size: 12px;
                padding: 6px 14px;
            }
            .step-item {
                padding: 22px 18px;
            }
            .method-card {
                padding: 24px 20px;
            }
            .faq-item label {
                padding: 16px 18px;
                font-size: 14px;
            }
            .faq-item .answer {
                padding: 0 18px;
            }
        }

        @media (min-width: 1025px) {
            .desktop-nav {
                display: flex;
            }
            .mobile-menu-btn {
                display: none;
            }
        }

        @media (max-width: 1024px) {
            .desktop-nav {
                display: none;
            }
            .mobile-menu-btn {
                display: inline-flex;
            }
        }

/* roulang page: article */
:root {
    --primary: #059669;
    --primary-dark: #047857;
    --primary-light: #34d399;
    --accent: #f59e0b;
    --bg: #f8fafc;
    --surface: #ffffff;
    --text: #0f172a;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    --border: #e2e8f0;
    --radius-lg: 18px;
    --radius-md: 14px;
    --radius-sm: 10px;
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
    --shadow: 0 6px 24px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 12px 48px rgba(15, 23, 42, 0.12);
    --space-section: 5rem;
}
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html {
    scroll-behavior: smooth;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}
img {
    max-width: 100%;
    height: auto;
    display: block;
}
a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease;
}
a:hover {
    color: var(--primary);
}
button {
    font-family: inherit;
    cursor: pointer;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding-left: 1.25rem;
    padding-right: 1.25rem;
}
.logo-text {
    background: linear-gradient(135deg, #34d399, #10b981);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 800;
    letter-spacing: -0.02em;
}
.header-nav {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(226, 232, 240, 0.7);
    box-shadow: 0 1px 12px rgba(15, 23, 42, 0.04);
}
.desktop-nav .nav-link {
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: all 0.25s ease;
}
.desktop-nav .nav-link:hover {
    color: var(--primary);
    background: rgba(16, 185, 129, 0.08);
}
.desktop-nav .nav-link.active {
    color: var(--primary);
    background: rgba(16, 185, 129, 0.12);
    font-weight: 600;
}
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.5rem;
    background: linear-gradient(135deg, #10b981, #059669);
    color: #fff;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 9999px;
    border: none;
    box-shadow: 0 4px 16px rgba(5, 150, 105, 0.25);
    transition: all 0.3s ease;
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(5, 150, 105, 0.35);
    color: #fff;
}
.btn-primary:active {
    transform: translateY(0);
}
.btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.5rem;
    background: transparent;
    color: var(--primary);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 9999px;
    border: 1.5px solid rgba(5, 150, 105, 0.4);
    transition: all 0.3s ease;
}
.btn-outline:hover {
    background: rgba(16, 185, 129, 0.08);
    border-color: var(--primary);
    color: var(--primary-dark);
}
.mobile-menu {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    background: #fff;
    z-index: 200;
    padding: 2rem 1.5rem;
    box-shadow: -8px 0 32px rgba(15, 23, 42, 0.15);
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
}
.mobile-menu.show {
    transform: translateX(0);
}
.mobile-menu .mobile-links li {
    margin-bottom: 0.5rem;
}
.mobile-menu .mobile-links a {
    display: block;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text);
    transition: all 0.2s ease;
}
.mobile-menu .mobile-links a:hover,
.mobile-menu .mobile-links a.active {
    background: rgba(16, 185, 129, 0.1);
    color: var(--primary);
}
.mobile-menu-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.5);
    z-index: 150;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}
.mobile-menu-overlay.show {
    opacity: 1;
    visibility: visible;
}
.article-banner {
    position: relative;
    background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
    padding: 5rem 0 3.5rem;
}
.article-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(6, 78, 59, 0.92), rgba(15, 23, 42, 0.78));
}
.article-banner .container {
    position: relative;
    z-index: 2;
}
.breadcrumb {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.8125rem;
    color: rgba(255, 255, 255, 0.65);
    padding: 0.375rem 0.875rem;
    background: rgba(255, 255, 255, 0.12);
    border-radius: 9999px;
    backdrop-filter: blur(8px);
    margin-bottom: 1.25rem;
}
.breadcrumb a {
    color: rgba(255, 255, 255, 0.75);
    transition: color 0.2s;
}
.breadcrumb a:hover {
    color: #fff;
}
.breadcrumb .sep {
    opacity: 0.5;
    font-size: 0.7rem;
}
.article-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
    font-size: 0.8125rem;
    color: rgba(255, 255, 255, 0.85);
    margin-top: 1rem;
}
.article-meta-item {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.25rem 0.75rem;
    background: rgba(255, 255, 255, 0.12);
    border-radius: 9999px;
}
.article-main {
    padding: 3rem 0 4rem;
}
.article-body {
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 2.5rem;
    border: 1px solid rgba(226, 232, 240, 0.5);
}
.article-content {
    color: #334155;
    font-size: 1rem;
    line-height: 1.85;
}
.article-content p {
    margin-bottom: 1.25rem;
}
.article-content h2 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text);
    margin-top: 2.25rem;
    margin-bottom: 0.875rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid rgba(16, 185, 129, 0.15);
}
.article-content h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text);
    margin-top: 1.75rem;
    margin-bottom: 0.75rem;
}
.article-content ul,
.article-content ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
}
.article-content ul li,
.article-content ol li {
    margin-bottom: 0.5rem;
    position: relative;
}
.article-content img {
    border-radius: var(--radius-md);
    margin: 1.5rem 0;
    box-shadow: var(--shadow);
}
.article-content blockquote {
    padding: 1rem 1.5rem;
    margin: 1.5rem 0;
    border-left: 4px solid var(--primary);
    background: rgba(16, 185, 129, 0.06);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    color: var(--text-muted);
}
.article-content a {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}
.article-content a:hover {
    color: var(--primary-dark);
}
.article-content code {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.875rem;
    background: #f1f5f9;
    padding: 0.2em 0.45em;
    border-radius: 6px;
    color: #be185d;
}
.article-content pre {
    background: var(--text);
    color: #e2e8f0;
    padding: 1.25rem 1.5rem;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    line-height: 1.7;
}
.article-divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 2.5rem 0;
    color: var(--text-light);
    font-size: 0.8125rem;
}
.article-divider::before,
.article-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}
.sidebar-card {
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}
.sidebar-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.sidebar-title i {
    color: var(--primary);
}
.sidebar-list li {
    padding: 0.625rem 0;
    border-bottom: 1px solid #f1f5f9;
}
.sidebar-list li:last-child {
    border-bottom: none;
}
.sidebar-list a {
    display: block;
    font-size: 0.875rem;
    color: var(--text-muted);
    transition: all 0.2s;
    line-height: 1.5;
}
.sidebar-list a:hover {
    color: var(--primary);
    transform: translateX(3px);
}
.related-section {
    background: #fff;
    border-top: 1px solid var(--border);
    padding: 4rem 0;
}
.related-card {
    background: #fff;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: all 0.35s ease;
}
.related-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(16, 185, 129, 0.3);
}
.related-card .card-img {
    height: 170px;
    overflow: hidden;
    background: #f1f5f9;
}
.related-card .card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}
.related-card:hover .card-img img {
    transform: scale(1.05);
}
.related-card .card-body {
    padding: 1.25rem 1.5rem 1.5rem;
}
.related-card .card-cat {
    display: inline-block;
    padding: 0.2rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(16, 185, 129, 0.1);
    color: var(--primary);
    border-radius: 9999px;
    margin-bottom: 0.625rem;
}
.related-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    line-height: 1.5;
    margin-bottom: 0.625rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.related-card h3 a:hover {
    color: var(--primary);
}
.related-card .card-excerpt {
    font-size: 0.8125rem;
    color: var(--text-muted);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 0.875rem;
}
.related-card .card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-light);
    border-top: 1px solid #f1f5f9;
    padding-top: 0.75rem;
}
.faq-section {
    padding: var(--space-section) 0;
    background: var(--bg);
}
.faq-item {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    margin-bottom: 0.875rem;
    overflow: hidden;
    transition: all 0.3s ease;
}
.faq-item:hover {
    border-color: rgba(16, 185, 129, 0.3);
    box-shadow: var(--shadow-sm);
}
.faq-item summary {
    padding: 1rem 1.25rem;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    list-style: none;
}
.faq-item summary::-webkit-details-marker {
    display: none;
}
.faq-item summary i {
    color: var(--primary);
    font-size: 0.875rem;
    transition: transform 0.3s;
}
.faq-item[open] summary i {
    transform: rotate(180deg);
}
.faq-item .faq-answer {
    padding: 0 1.25rem 1rem;
    color: var(--text-muted);
    font-size: 0.875rem;
    line-height: 1.7;
}
.cta-section {
    position: relative;
    background: linear-gradient(135deg, #064e3b, #065f46, #0f172a);
    padding: 4.5rem 0;
    overflow: hidden;
}
.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.25), transparent 70%);
    border-radius: 50%;
}
.cta-section .container {
    position: relative;
    z-index: 2;
}
.footer {
    background: #0f172a;
    color: #94a3b8;
    padding: 3.5rem 0 2rem;
}
.footer a {
    color: #94a3b8;
    transition: color 0.2s;
}
.footer a:hover {
    color: #34d399;
}
.footer h4 {
    color: #f1f5f9;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}
.footer ul li {
    margin-bottom: 0.5rem;
}
.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}
.tag-chip {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    border-radius: 9999px;
    background: rgba(16, 185, 129, 0.1);
    color: var(--primary);
    border: 1px solid rgba(16, 185, 129, 0.15);
    transition: all 0.2s;
}
.tag-chip:hover {
    background: rgba(16, 185, 129, 0.18);
    border-color: rgba(16, 185, 129, 0.3);
    color: var(--primary-dark);
}
.not-found-box {
    text-align: center;
    padding: 4rem 2rem;
}
.not-found-box .not-found-icon {
    font-size: 3.5rem;
    color: var(--text-light);
    margin-bottom: 1.5rem;
}
.section-header {
    text-align: center;
    margin-bottom: 2.5rem;
}
.section-header .section-sub {
    display: inline-block;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--primary);
    background: rgba(16, 185, 129, 0.1);
    padding: 0.3rem 1rem;
    border-radius: 9999px;
    margin-bottom: 0.75rem;
}
.section-header h2 {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.02em;
}
.section-header p {
    color: var(--text-muted);
    font-size: 0.95rem;
    max-width: 560px;
    margin: 0.625rem auto 0;
}
@media (max-width: 1024px) {
    .article-body {
        padding: 2rem;
    }
    :root {
        --space-section: 4rem;
    }
}
@media (max-width: 768px) {
    .desktop-nav {
        display: none;
    }
    .article-banner {
        padding: 3.5rem 0 2.5rem;
    }
    .article-body {
        padding: 1.5rem;
    }
    .article-content {
        font-size: 0.95rem;
    }
    .article-content h2 {
        font-size: 1.25rem;
    }
    .section-header h2 {
        font-size: 1.4rem;
    }
    :root {
        --space-section: 3rem;
    }
    .related-section {
        padding: 3rem 0;
    }
}
@media (max-width: 520px) {
    .article-banner {
        padding: 2.5rem 0 2rem;
    }
    .article-meta {
        gap: 0.5rem;
        flex-direction: column;
        align-items: flex-start;
    }
    .article-body {
        padding: 1.25rem;
        border-radius: var(--radius-md);
    }
    .related-card .card-img {
        height: 140px;
    }
    .btn-primary {
        padding: 0.5rem 1.25rem;
        font-size: 0.8125rem;
    }
}