/* roulang page: index */
:root {
            --brand: #2563EB;
            --brand-dark: #1D4ED8;
            --field-green: #16A34A;
            --amber-warn: #F59E0B;
            --ink: #0F172A;
            --slate-body: #334155;
            --slate-muted: #64748B;
            --line: #E2E8F0;
            --page-bg: #F5F8FB;
            --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
            --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
            --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.12);
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --radius-2xl: 1.5rem;
            --radius-full: 9999px;
            --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        body {
            margin: 0;
            font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            font-size: 16px;
            line-height: 1.8;
            color: var(--slate-body);
            background-color: var(--page-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            color: var(--brand);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--brand-dark);
        }

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

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

        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--brand);
            outline-offset: 2px;
            border-radius: 4px;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        @media (max-width: 640px) {
            .container {
                padding: 0 16px;
            }
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--line);
            box-shadow: 0 1px 6px rgba(15, 23, 42, 0.04);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 12px 0;
        }

        .logo-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 800;
            font-size: 1.2rem;
            color: var(--ink);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .logo-link:hover {
            color: var(--brand);
        }
        .logo-mark {
            width: 32px;
            height: 32px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 100%);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 0.9rem;
            flex-shrink: 0;
        }

        .nav-chips {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: nowrap;
            overflow-x: auto;
            scrollbar-width: none;
            -ms-overflow-style: none;
        }
        .nav-chips::-webkit-scrollbar {
            display: none;
        }
        .nav-chip {
            flex-shrink: 0;
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: var(--radius-full);
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--slate-body);
            background: #EDF2F7;
            transition: var(--transition);
            border: 1px solid transparent;
            white-space: nowrap;
        }
        .nav-chip:hover {
            background: #E2E8F0;
            color: var(--ink);
        }
        .nav-chip.active {
            background: var(--brand);
            color: #ffffff;
            border-color: var(--brand);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 22px;
            border-radius: var(--radius-xl);
            font-weight: 700;
            font-size: 0.95rem;
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid transparent;
            text-align: center;
        }
        .btn-primary {
            background: var(--brand);
            color: #fff;
            border-color: var(--brand);
        }
        .btn-primary:hover {
            background: var(--brand-dark);
            border-color: var(--brand-dark);
            box-shadow: 0 4px 16px rgba(37, 99, 235, 0.35);
            transform: translateY(-1px);
            color: #fff;
        }
        .btn-secondary {
            background: #ffffff;
            color: var(--brand);
            border-color: var(--brand);
        }
        .btn-secondary:hover {
            background: #EFF6FF;
            border-color: var(--brand-dark);
            color: var(--brand-dark);
            transform: translateY(-1px);
        }
        .btn-sm {
            padding: 7px 16px;
            font-size: 0.85rem;
        }
        .btn-lg {
            padding: 13px 28px;
            font-size: 1rem;
        }

        .section {
            padding: 60px 0;
        }
        @media (max-width: 768px) {
            .section {
                padding: 40px 0;
            }
        }

        .section-title {
            font-size: 1.75rem;
            font-weight: 800;
            color: var(--ink);
            line-height: 1.35;
            margin: 0 0 8px;
        }
        @media (max-width: 768px) {
            .section-title {
                font-size: 1.4rem;
            }
        }
        .section-desc {
            font-size: 1rem;
            color: var(--slate-muted);
            max-width: 680px;
            line-height: 1.8;
            margin: 0 0 32px;
        }

        .card {
            background: #fff;
            border-radius: var(--radius-2xl);
            border: 1px solid var(--line);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }

        .chip-tag {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 4px 12px;
            border-radius: var(--radius-full);
            font-size: 0.75rem;
            font-weight: 600;
            background: #F1F5F9;
            color: var(--slate-muted);
            white-space: nowrap;
        }
        .chip-tag.green {
            background: #F0FDF4;
            color: var(--field-green);
        }
        .chip-tag.blue {
            background: #EFF6FF;
            color: var(--brand);
        }
        .chip-tag.amber {
            background: #FFFBEB;
            color: var(--amber-warn);
        }

        .img-frame {
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid #fff;
            box-shadow: 0 1px 4px rgba(15, 23, 42, 0.08), inset 0 0 0 1px rgba(15, 23, 42, 0.04);
            background: #E2E8F0;
        }
        .img-frame img {
            width: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .card:hover .img-frame img {
            transform: scale(1.04);
        }

        .hero-bg {
            background-image: url('/assets/images/5670a894710f53e9.webp');
            background-size: cover;
            background-position: center;
            position: relative;
            overflow: hidden;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(100deg, rgba(255, 255, 255, 0.96) 0%, rgba(255, 255, 255, 0.88) 40%, rgba(255, 255, 255, 0.55) 70%, rgba(245, 248, 251, 0.4) 100%);
            z-index: 1;
        }
        .hero-content {
            position: relative;
            z-index: 2;
        }

        .hero-img-wrap {
            position: relative;
            z-index: 2;
            transform: translateY(12px) rotate(-1.5deg);
            transition: var(--transition);
        }
        @media (max-width: 1024px) {
            .hero-img-wrap {
                transform: none;
            }
        }
        .hero-img-wrap::after {
            content: '';
            position: absolute;
            inset: 0;
            border-radius: var(--radius-2xl);
            background: linear-gradient(145deg, rgba(37, 99, 235, 0.12) 0%, rgba(22, 163, 74, 0.08) 100%);
            pointer-events: none;
            z-index: 1;
        }

        .stat-bar {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            align-items: center;
        }
        .stat-item {
            display: flex;
            flex-direction: column;
            gap: 2px;
        }
        .stat-num {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--ink);
            line-height: 1.2;
        }
        .stat-label {
            font-size: 0.8rem;
            color: var(--slate-muted);
            font-weight: 500;
        }

        .prob-bar {
            height: 6px;
            border-radius: 9999px;
            background: #F1F5F9;
            overflow: hidden;
            flex: 1;
        }
        .prob-fill {
            height: 100%;
            border-radius: 9999px;
            transition: width 0.6s ease;
        }

        .faq-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 18px 20px;
            background: transparent;
            border: none;
            cursor: pointer;
            font-weight: 700;
            font-size: 0.95rem;
            color: var(--ink);
            text-align: left;
            transition: var(--transition);
        }
        .faq-question:hover {
            background: #F8FAFC;
        }
        .faq-question i {
            transition: transform 0.3s ease;
            color: var(--brand);
            flex-shrink: 0;
        }
        .faq-card.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 20px;
            color: var(--slate-body);
            font-size: 0.9rem;
            line-height: 1.8;
        }
        .faq-card.open .faq-answer {
            max-height: 300px;
            padding: 0 20px 18px;
        }

        .partner-logo {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 24px;
            border-radius: var(--radius-lg);
            background: #fff;
            border: 1px solid var(--line);
            font-weight: 700;
            color: var(--slate-muted);
            font-size: 0.9rem;
            white-space: nowrap;
            transition: var(--transition);
        }
        .partner-logo:hover {
            border-color: var(--brand);
            color: var(--brand);
        }

        .form-input {
            width: 100%;
            padding: 11px 16px;
            border-radius: var(--radius-lg);
            border: 1px solid var(--line);
            background: #fff;
            font-size: 0.95rem;
            color: var(--ink);
            transition: var(--transition);
        }
        .form-input:focus {
            outline: none;
            border-color: var(--brand);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
        }
        .form-label {
            display: block;
            font-size: 0.82rem;
            font-weight: 600;
            color: var(--slate-body);
            margin-bottom: 6px;
        }

        .footer {
            background: var(--ink);
            color: #CBD5E1;
            padding: 48px 0 24px;
        }
        .footer a {
            color: #CBD5E1;
        }
        .footer a:hover {
            color: #fff;
        }
        .footer-title {
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            margin-bottom: 16px;
        }

        .horizontal-scroll {
            display: flex;
            gap: 16px;
            overflow-x: auto;
            scrollbar-width: thin;
            scrollbar-color: var(--line) transparent;
            padding-bottom: 8px;
        }
        .horizontal-scroll::-webkit-scrollbar {
            height: 6px;
        }
        .horizontal-scroll::-webkit-scrollbar-thumb {
            background: var(--line);
            border-radius: 9999px;
        }

        @media (max-width: 768px) {
            .header-inner {
                flex-wrap: nowrap;
                gap: 10px;
            }
            .nav-chips {
                gap: 4px;
                padding-bottom: 4px;
            }
            .nav-chip {
                padding: 6px 12px;
                font-size: 0.8rem;
            }
            .btn-nav {
                padding: 7px 14px;
                font-size: 0.8rem;
            }
            .section-title {
                font-size: 1.3rem;
            }
            .hero-bg {
                min-height: auto;
                padding: 40px 0;
            }
            .stat-num {
                font-size: 1.4rem;
            }
            .stat-bar {
                gap: 16px;
            }
        }

/* roulang page: category2 */
:root {
            --brand: #2563EB;
            --brand-dark: #1D4ED8;
            --field-green: #16A34A;
            --amber-warn: #F59E0B;
            --ink: #0F172A;
            --slate-body: #334155;
            --slate-muted: #64748B;
            --line: #E2E8F0;
            --page-bg: #F5F8FB;
            --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
            --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
            --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.12);
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --radius-2xl: 1.5rem;
            --radius-full: 9999px;
            --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            margin: 0;
            font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            font-size: 16px;
            line-height: 1.8;
            color: var(--slate-body);
            background-color: var(--page-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

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

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

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

        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--brand);
            outline-offset: 2px;
            border-radius: 4px;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        @media (max-width: 640px) {
            .container {
                padding: 0 16px;
            }
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--line);
            box-shadow: 0 1px 6px rgba(15, 23, 42, 0.04);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 12px 0;
        }

        .logo-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 800;
            font-size: 1.2rem;
            color: var(--ink);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }

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

        .logo-mark {
            width: 32px;
            height: 32px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 100%);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 0.9rem;
            flex-shrink: 0;
        }

        .nav-chips {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: nowrap;
            overflow-x: auto;
            scrollbar-width: none;
            -ms-overflow-style: none;
        }

        .nav-chips::-webkit-scrollbar {
            display: none;
        }

        .nav-chip {
            flex-shrink: 0;
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: var(--radius-full);
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--slate-body);
            background: #EDF2F7;
            transition: var(--transition);
            border: 1px solid transparent;
            white-space: nowrap;
        }

        .nav-chip:hover {
            background: #E2E8F0;
            color: var(--ink);
        }

        .nav-chip.active {
            background: var(--brand);
            color: #ffffff;
            border-color: var(--brand);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 22px;
            border-radius: var(--radius-xl);
            font-weight: 700;
            font-size: 0.95rem;
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid transparent;
            text-align: center;
        }

        .btn-primary {
            background: var(--brand);
            color: #fff;
            border-color: var(--brand);
        }

        .btn-primary:hover {
            background: var(--brand-dark);
            border-color: var(--brand-dark);
            box-shadow: 0 4px 16px rgba(37, 99, 235, 0.35);
            transform: translateY(-1px);
            color: #fff;
        }

        .btn-secondary {
            background: #ffffff;
            color: var(--brand);
            border-color: var(--brand);
        }

        .btn-secondary:hover {
            background: #EFF6FF;
            border-color: var(--brand-dark);
            color: var(--brand-dark);
            transform: translateY(-1px);
        }

        .btn-sm {
            padding: 7px 16px;
            font-size: 0.85rem;
        }

        .btn-lg {
            padding: 13px 28px;
            font-size: 1rem;
        }

        .section {
            padding: 56px 0;
        }

        @media (max-width: 768px) {
            .section {
                padding: 36px 0;
            }
        }

        .section-title {
            font-size: 1.75rem;
            font-weight: 800;
            color: var(--ink);
            line-height: 1.35;
            margin: 0 0 8px;
        }

        @media (max-width: 640px) {
            .section-title {
                font-size: 1.4rem;
            }
        }

        .section-desc {
            font-size: 1rem;
            color: var(--slate-muted);
            max-width: 680px;
            line-height: 1.8;
            margin: 0 0 32px;
        }

        .card {
            background: #fff;
            border-radius: var(--radius-2xl);
            border: 1px solid var(--line);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            overflow: hidden;
        }

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

        .card-img-wrap {
            position: relative;
            overflow: hidden;
            border-radius: var(--radius-lg) var(--radius-lg) 0 0;
            aspect-ratio: 16 / 9;
        }

        .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .card:hover .card-img-wrap img {
            transform: scale(1.04);
        }

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

        .card-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--ink);
            line-height: 1.45;
            margin: 0 0 8px;
        }

        .card-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 12px;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            padding: 4px 12px;
            border-radius: var(--radius-full);
            font-size: 0.78rem;
            font-weight: 600;
            white-space: nowrap;
            line-height: 1.5;
        }

        .badge-blue {
            background: #EFF6FF;
            color: var(--brand);
        }

        .badge-green {
            background: #F0FDF4;
            color: var(--field-green);
        }

        .badge-amber {
            background: #FFFBEB;
            color: var(--amber-warn);
        }

        .badge-slate {
            background: #F1F5F9;
            color: #64748B;
        }

        .card-text {
            font-size: 0.92rem;
            color: var(--slate-body);
            line-height: 1.75;
            margin: 0;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--slate-muted);
            margin-bottom: 12px;
        }

        .breadcrumb a {
            color: var(--slate-muted);
        }

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

        .breadcrumb .sep {
            color: #CBD5E1;
        }

        .breadcrumb .current {
            color: var(--ink);
            font-weight: 600;
        }

        .filter-chip {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: var(--radius-full);
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--slate-body);
            background: #fff;
            border: 1px solid var(--line);
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }

        .filter-chip:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: #F8FAFC;
        }

        .filter-chip.active {
            background: var(--brand);
            color: #fff;
            border-color: var(--brand);
        }

        .filter-bar {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            overflow-x: auto;
            scrollbar-width: none;
        }

        .filter-bar::-webkit-scrollbar {
            display: none;
        }

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

        .faq-item:hover {
            border-color: #CBD5E1;
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 22px;
            background: #fff;
            border: none;
            cursor: pointer;
            font-size: 1rem;
            font-weight: 700;
            color: var(--ink);
            text-align: left;
            transition: var(--transition);
        }

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

        .faq-question .faq-icon {
            flex-shrink: 0;
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: #F1F5F9;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: var(--slate-muted);
            font-size: 0.85rem;
            transition: var(--transition);
        }

        .faq-item.open .faq-question .faq-icon {
            background: var(--brand);
            color: #fff;
            transform: rotate(180deg);
        }

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

        .faq-item.open .faq-answer {
            max-height: 500px;
        }

        .faq-answer-inner {
            padding: 0 22px 20px;
            font-size: 0.92rem;
            color: var(--slate-body);
            line-height: 1.8;
        }

        .gallery-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-xl);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

        .gallery-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .gallery-card img {
            width: 100%;
            aspect-ratio: 4 / 3;
            object-fit: cover;
            display: block;
        }

        .gallery-caption {
            padding: 12px 16px;
            font-size: 0.82rem;
            color: var(--slate-muted);
            line-height: 1.6;
            border-top: 1px solid var(--line);
        }

        .footer {
            background: #0F172A;
            color: #CBD5E1;
            padding: 56px 0 32px;
            margin-top: 40px;
        }

        .footer a {
            color: #CBD5E1;
        }

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

        .footer-title {
            font-size: 0.95rem;
            font-weight: 700;
            color: #fff;
            margin: 0 0 12px;
        }

        .footer .space-y-2>li {
            list-style: none;
            padding: 0;
            margin: 0;
        }

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

        .footer li {
            padding: 2px 0;
        }

        .cta-box {
            background: linear-gradient(135deg, #EFF6FF 0%, #DBEAFE 100%);
            border: 1px solid #BFDBFE;
            border-radius: var(--radius-2xl);
            padding: 36px 32px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            flex-wrap: wrap;
        }

        .cta-box .cta-title {
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--ink);
            margin: 0 0 4px;
        }

        .cta-box .cta-desc {
            font-size: 0.95rem;
            color: var(--slate-muted);
            margin: 0;
        }

        .method-band {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-2xl);
            padding: 28px 32px;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            box-shadow: var(--shadow-sm);
        }

        @media (max-width: 768px) {
            .method-band {
                grid-template-columns: 1fr;
                padding: 20px;
            }
        }

        .method-item {
            display: flex;
            gap: 12px;
            align-items: flex-start;
        }

        .method-icon {
            width: 40px;
            height: 40px;
            border-radius: 12px;
            background: #EFF6FF;
            color: var(--brand);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 1rem;
        }

        .method-item h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 4px;
        }

        .method-item p {
            font-size: 0.9rem;
            color: var(--slate-muted);
            margin: 0;
            line-height: 1.7;
        }

        @media (max-width: 640px) {
            .header-inner {
                gap: 8px;
            }
            .logo-link {
                font-size: 1rem;
            }
            .logo-mark {
                width: 28px;
                height: 28px;
                font-size: 0.8rem;
            }
            .btn-nav {
                padding: 6px 12px;
                font-size: 0.8rem;
            }
            .nav-chip {
                padding: 6px 12px;
                font-size: 0.82rem;
            }
            .cta-box {
                padding: 24px 18px;
                flex-direction: column;
                text-align: center;
            }
            .cta-box .cta-title {
                font-size: 1.1rem;
            }
            .section-title {
                font-size: 1.35rem;
            }
            .card-body {
                padding: 16px 16px 18px;
            }
            .card-title {
                font-size: 1rem;
            }
        }

/* roulang page: category1 */
:root {
            --brand: #2563EB;
            --brand-dark: #1D4ED8;
            --field-green: #16A34A;
            --amber-warn: #F59E0B;
            --ink: #0F172A;
            --slate-body: #334155;
            --slate-muted: #64748B;
            --line: #E2E8F0;
            --page-bg: #F5F8FB;
            --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
            --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
            --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.12);
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --radius-2xl: 1.5rem;
            --radius-full: 9999px;
            --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            margin: 0;
            font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            font-size: 16px;
            line-height: 1.8;
            color: var(--slate-body);
            background-color: var(--page-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: var(--brand);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--brand-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--brand);
            outline-offset: 2px;
            border-radius: 4px;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header / Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255, 255, 255, 0.97);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--line);
            box-shadow: 0 1px 6px rgba(15, 23, 42, 0.04);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 12px 0;
        }
        .logo-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 800;
            font-size: 1.2rem;
            color: var(--ink);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .logo-link:hover {
            color: var(--brand);
        }
        .logo-mark {
            width: 32px;
            height: 32px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 100%);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 0.9rem;
            flex-shrink: 0;
        }
        .nav-chips {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: nowrap;
            overflow-x: auto;
            scrollbar-width: none;
            -ms-overflow-style: none;
        }
        .nav-chips::-webkit-scrollbar {
            display: none;
        }
        .nav-chip {
            flex-shrink: 0;
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: var(--radius-full);
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--slate-body);
            background: #EDF2F7;
            transition: var(--transition);
            border: 1px solid transparent;
            white-space: nowrap;
        }
        .nav-chip:hover {
            background: #E2E8F0;
            color: var(--ink);
        }
        .nav-chip.active {
            background: var(--brand);
            color: #ffffff;
            border-color: var(--brand);
        }

        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 22px;
            border-radius: var(--radius-xl);
            font-weight: 700;
            font-size: 0.95rem;
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid transparent;
            text-align: center;
        }
        .btn-primary {
            background: var(--brand);
            color: #fff;
            border-color: var(--brand);
        }
        .btn-primary:hover {
            background: var(--brand-dark);
            border-color: var(--brand-dark);
            box-shadow: 0 4px 16px rgba(37, 99, 235, 0.35);
            transform: translateY(-1px);
            color: #fff;
        }
        .btn-secondary {
            background: #ffffff;
            color: var(--brand);
            border-color: var(--brand);
        }
        .btn-secondary:hover {
            background: #EFF6FF;
            border-color: var(--brand-dark);
            color: var(--brand-dark);
            transform: translateY(-1px);
        }
        .btn-sm {
            padding: 7px 16px;
            font-size: 0.85rem;
        }
        .btn-lg {
            padding: 13px 28px;
            font-size: 1rem;
        }

        /* Sections */
        .section {
            padding: 60px 0;
        }
        .section-title {
            font-size: 1.75rem;
            font-weight: 800;
            color: var(--ink);
            line-height: 1.35;
            margin: 0 0 8px;
        }
        .section-desc {
            font-size: 1rem;
            color: var(--slate-muted);
            max-width: 680px;
            line-height: 1.8;
            margin: 0 0 32px;
        }

        /* Cards */
        .card {
            background: #fff;
            border-radius: var(--radius-2xl);
            border: 1px solid var(--line);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            overflow: hidden;
        }
        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
        }
        .card-img-wrap {
            height: 200px;
            overflow: hidden;
            position: relative;
            border-radius: var(--radius-lg) var(--radius-lg) 0 0;
        }
        .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .card:hover .card-img-wrap img {
            transform: scale(1.04);
        }
        .card-body {
            padding: 20px 22px 22px;
        }
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 3px 10px;
            border-radius: var(--radius-full);
            font-size: 0.75rem;
            font-weight: 600;
            white-space: nowrap;
        }
        .badge-blue {
            background: #EFF6FF;
            color: var(--brand);
        }
        .badge-green {
            background: #F0FDF4;
            color: var(--field-green);
        }
        .badge-amber {
            background: #FFFBEB;
            color: var(--amber-warn);
        }
        .badge-slate {
            background: #F1F5F9;
            color: var(--slate-muted);
        }

        /* Breadcrumb */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--slate-muted);
            margin-bottom: 8px;
        }
        .breadcrumb a {
            color: var(--slate-muted);
        }
        .breadcrumb a:hover {
            color: var(--brand);
        }
        .breadcrumb-sep {
            color: #94A3B8;
            font-size: 0.7rem;
        }

        /* Filter chips */
        .filter-chip {
            flex-shrink: 0;
            display: inline-flex;
            align-items: center;
            padding: 7px 16px;
            border-radius: var(--radius-full);
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--slate-body);
            background: #fff;
            border: 1px solid var(--line);
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }
        .filter-chip:hover {
            border-color: var(--brand);
            color: var(--brand);
            background: #EFF6FF;
        }
        .filter-chip.active {
            background: var(--brand);
            color: #fff;
            border-color: var(--brand);
        }

        /* Progress bars */
        .prob-bar-wrap {
            display: flex;
            height: 8px;
            border-radius: var(--radius-full);
            overflow: hidden;
            background: #F1F5F9;
            margin: 8px 0;
        }
        .prob-bar-home {
            background: var(--brand);
            height: 100%;
            transition: width 0.6s ease;
        }
        .prob-bar-draw {
            background: #94A3B8;
            height: 100%;
            transition: width 0.6s ease;
        }
        .prob-bar-away {
            background: var(--field-green);
            height: 100%;
            transition: width 0.6s ease;
        }

        /* FAQ accordion */
        .faq-item {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-xl);
            overflow: hidden;
            margin-bottom: 12px;
            transition: var(--transition);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 18px 22px;
            background: none;
            border: none;
            cursor: pointer;
            font-weight: 700;
            font-size: 0.95rem;
            color: var(--ink);
            text-align: left;
            transition: var(--transition);
        }
        .faq-question:hover {
            color: var(--brand);
        }
        .faq-arrow {
            flex-shrink: 0;
            font-size: 0.8rem;
            color: var(--slate-muted);
            transition: transform 0.3s ease;
        }
        .faq-question[aria-expanded="true"] .faq-arrow {
            transform: rotate(180deg);
            color: var(--brand);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease;
        }
        .faq-answer-inner {
            padding: 0 22px 18px;
            color: var(--slate-muted);
            font-size: 0.9rem;
            line-height: 1.8;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
        }

        /* CTA form */
        .form-input {
            width: 100%;
            padding: 12px 16px;
            border-radius: var(--radius-md);
            border: 1px solid var(--line);
            background: #fff;
            font-size: 0.95rem;
            color: var(--ink);
            transition: var(--transition);
        }
        .form-input:focus {
            border-color: var(--brand);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
            outline: none;
        }
        .form-label {
            display: block;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 6px;
        }

        /* Footer */
        .footer {
            background: #0F172A;
            color: #E2E8F0;
            padding: 56px 0 24px;
        }
        .footer a {
            color: #94A3B8;
            transition: var(--transition);
        }
        .footer a:hover {
            color: #ffffff;
        }
        .footer-title {
            font-size: 0.95rem;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 16px;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
            .section {
                padding: 40px 0;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .header-inner {
                flex-wrap: wrap;
                gap: 8px;
                padding: 10px 0;
            }
            .nav-chips {
                order: 3;
                width: 100%;
                overflow-x: auto;
                padding-bottom: 4px;
            }
            .nav-chip {
                font-size: 0.8rem;
                padding: 6px 12px;
            }
            .card-img-wrap {
                height: 160px;
            }
            .btn-nav {
                padding: 6px 14px;
                font-size: 0.8rem;
            }
            .hero-stack {
                grid-template-columns: 1fr !important;
                gap: 16px !important;
            }
            .hero-side-card {
                display: none;
            }
            .gallery-grid {
                grid-template-columns: repeat(2, 1fr) !important;
                gap: 12px !important;
            }
        }
        @media (max-width: 520px) {
            .section {
                padding: 32px 0;
            }
            .section-title {
                font-size: 1.2rem;
            }
            .card-img-wrap {
                height: 140px;
            }
            .gallery-grid {
                grid-template-columns: 1fr !important;
            }
            .footer {
                padding: 40px 0 16px;
            }
            .logo-link {
                font-size: 1rem;
            }
            .logo-mark {
                width: 28px;
                height: 28px;
                font-size: 0.8rem;
            }
        }

        /* Category page specific */
        .page-header-band {
            background: linear-gradient(135deg, #EEF4FF 0%, #F5F8FB 100%);
            border-bottom: 1px solid var(--line);
            padding: 32px 0 28px;
        }
        .prob-label {
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--slate-muted);
            min-width: 36px;
        }
        .prob-values {
            display: flex;
            gap: 16px;
            font-size: 0.8rem;
            font-weight: 700;
            color: var(--ink);
        }
        .node-detail-list {
            list-style: none;
            padding: 0;
            margin: 0;
            font-size: 0.85rem;
            color: var(--slate-muted);
        }
        .node-detail-list li {
            display: flex;
            align-items: flex-start;
            gap: 8px;
            margin-bottom: 4px;
        }
        .node-detail-list i {
            color: var(--brand);
            font-size: 0.7rem;
            margin-top: 6px;
            flex-shrink: 0;
        }
        .gallery-figure {
            border-radius: var(--radius-xl);
            overflow: hidden;
            background: #fff;
            border: 1px solid var(--line);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .gallery-figure:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
        }
        .gallery-figure img {
            width: 100%;
            height: 200px;
            object-fit: cover;
        }
        .gallery-caption {
            padding: 12px 16px;
            font-size: 0.85rem;
            color: var(--slate-muted);
            line-height: 1.6;
        }
        .league-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 14px;
            border-radius: var(--radius-full);
            background: #fff;
            border: 1px solid var(--line);
            font-size: 0.82rem;
            font-weight: 600;
            color: var(--slate-body);
            transition: var(--transition);
        }
        .league-tag:hover {
            border-color: var(--brand);
            color: var(--brand);
        }
        .entry-card {
            background: #fff;
            border-radius: var(--radius-xl);
            border: 1px solid var(--line);
            padding: 20px;
            text-align: center;
            transition: var(--transition);
            display: block;
        }
        .entry-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
            border-color: var(--brand);
        }
        .entry-card-icon {
            width: 48px;
            height: 48px;
            border-radius: 14px;
            background: #EFF6FF;
            color: var(--brand);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            margin-bottom: 12px;
        }

/* roulang page: category3 */
:root {
            --brand: #2563EB;
            --brand-dark: #1D4ED8;
            --field-green: #16A34A;
            --amber-warn: #F59E0B;
            --ink: #0F172A;
            --slate-body: #334155;
            --slate-muted: #64748B;
            --line: #E2E8F0;
            --page-bg: #F5F8FB;
            --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
            --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
            --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.12);
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --radius-2xl: 1.5rem;
            --radius-full: 9999px;
            --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            margin: 0;
            font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            font-size: 16px;
            line-height: 1.8;
            color: var(--slate-body);
            background-color: var(--page-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: var(--brand);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--brand-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--brand);
            outline-offset: 2px;
            border-radius: 4px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--line);
            box-shadow: 0 1px 6px rgba(15, 23, 42, 0.04);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 12px 0;
        }
        .logo-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 800;
            font-size: 1.2rem;
            color: var(--ink);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .logo-link:hover {
            color: var(--brand);
        }
        .logo-mark {
            width: 32px;
            height: 32px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 100%);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 0.9rem;
            flex-shrink: 0;
        }
        .nav-chips {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: nowrap;
            overflow-x: auto;
            scrollbar-width: none;
            -ms-overflow-style: none;
        }
        .nav-chips::-webkit-scrollbar {
            display: none;
        }
        .nav-chip {
            flex-shrink: 0;
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: var(--radius-full);
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--slate-body);
            background: #EDF2F7;
            transition: var(--transition);
            border: 1px solid transparent;
            white-space: nowrap;
        }
        .nav-chip:hover {
            background: #E2E8F0;
            color: var(--ink);
        }
        .nav-chip.active {
            background: var(--brand);
            color: #ffffff;
            border-color: var(--brand);
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 22px;
            border-radius: var(--radius-xl);
            font-weight: 700;
            font-size: 0.95rem;
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid transparent;
            text-align: center;
        }
        .btn-primary {
            background: var(--brand);
            color: #fff;
            border-color: var(--brand);
        }
        .btn-primary:hover {
            background: var(--brand-dark);
            border-color: var(--brand-dark);
            box-shadow: 0 4px 16px rgba(37, 99, 235, 0.35);
            transform: translateY(-1px);
            color: #fff;
        }
        .btn-secondary {
            background: #ffffff;
            color: var(--brand);
            border-color: var(--brand);
        }
        .btn-secondary:hover {
            background: #EFF6FF;
            border-color: var(--brand-dark);
            color: var(--brand-dark);
            transform: translateY(-1px);
        }
        .btn-sm {
            padding: 7px 16px;
            font-size: 0.85rem;
        }
        .btn-lg {
            padding: 13px 28px;
            font-size: 1rem;
        }
        .btn-nav {
            padding: 8px 18px;
            font-size: 0.9rem;
            white-space: nowrap;
        }
        .section {
            padding: 60px 0;
        }
        .section-title {
            font-size: 1.75rem;
            font-weight: 800;
            color: var(--ink);
            line-height: 1.35;
            margin: 0 0 8px;
        }
        .section-desc {
            font-size: 1rem;
            color: var(--slate-muted);
            max-width: 680px;
            line-height: 1.8;
            margin: 0 0 32px;
        }
        .card {
            background: #fff;
            border-radius: var(--radius-2xl);
            border: 1px solid var(--line);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            overflow: hidden;
        }
        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }
        .card-image-wrap {
            overflow: hidden;
            position: relative;
            border-radius: var(--radius-lg);
            margin-bottom: 16px;
        }
        .card-image-wrap img {
            object-fit: cover;
            width: 100%;
            height: 200px;
            transition: transform 0.4s ease;
        }
        .card:hover .card-image-wrap img {
            transform: scale(1.05);
        }
        .badge {
            display: inline-flex;
            align-items: center;
            padding: 4px 12px;
            border-radius: var(--radius-full);
            font-size: 0.75rem;
            font-weight: 600;
            white-space: nowrap;
            line-height: 1.4;
        }
        .badge-blue {
            background: #EFF6FF;
            color: var(--brand);
        }
        .badge-green {
            background: #F0FDF4;
            color: var(--field-green);
        }
        .badge-amber {
            background: #FFFBEB;
            color: var(--amber-warn);
        }
        .badge-gray {
            background: #F1F5F9;
            color: var(--slate-muted);
        }
        .chip-filter {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            border-radius: var(--radius-full);
            font-size: 0.88rem;
            font-weight: 600;
            color: var(--slate-body);
            background: #EDF2F7;
            transition: var(--transition);
            border: 1px solid transparent;
            cursor: pointer;
            white-space: nowrap;
            flex-shrink: 0;
        }
        .chip-filter:hover {
            background: #E2E8F0;
            color: var(--ink);
        }
        .chip-filter.active {
            background: var(--brand);
            color: #fff;
            border-color: var(--brand);
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--slate-muted);
            margin-bottom: 12px;
        }
        .breadcrumb a {
            color: var(--slate-muted);
            transition: var(--transition);
        }
        .breadcrumb a:hover {
            color: var(--brand);
        }
        .breadcrumb span.sep {
            color: var(--line);
            user-select: none;
        }
        .data-method-box {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-2xl);
            padding: 28px 32px;
            box-shadow: var(--shadow-sm);
        }
        .stat-item {
            text-align: center;
            padding: 16px 12px;
        }
        .stat-number {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--brand);
            line-height: 1.2;
        }
        .stat-label {
            font-size: 0.85rem;
            color: var(--slate-muted);
            margin-top: 6px;
        }
        .faq-item {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-xl);
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--brand);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 22px;
            cursor: pointer;
            font-weight: 600;
            color: var(--ink);
            font-size: 0.95rem;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: var(--transition);
        }
        .faq-question:hover {
            color: var(--brand);
        }
        .faq-question .faq-arrow {
            flex-shrink: 0;
            transition: transform 0.35s ease;
            color: var(--slate-muted);
            font-size: 0.85rem;
        }
        .faq-item.open .faq-arrow {
            transform: rotate(180deg);
            color: var(--brand);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            color: var(--slate-body);
            font-size: 0.9rem;
            line-height: 1.8;
            padding: 0 22px;
        }
        .faq-item.open .faq-answer {
            max-height: 400px;
            padding: 0 22px 18px;
        }
        .form-input {
            width: 100%;
            padding: 11px 16px;
            border-radius: var(--radius-xl);
            border: 1px solid var(--line);
            background: #fff;
            font-size: 0.95rem;
            transition: var(--transition);
            color: var(--ink);
        }
        .form-input:focus {
            outline: none;
            border-color: var(--brand);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
        }
        .form-label {
            display: block;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 6px;
        }
        .footer {
            background: #0F172A;
            color: #E2E8F0;
            padding: 48px 0 24px;
        }
        .footer-title {
            font-size: 0.9rem;
            font-weight: 700;
            color: #fff;
            margin: 0 0 12px;
        }
        .footer a {
            color: #94A3B8;
            transition: var(--transition);
        }
        .footer a:hover {
            color: #fff;
        }
        .gallery-figure {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .gallery-figure:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .gallery-figure img {
            width: 100%;
            height: 180px;
            object-fit: cover;
        }
        .gallery-figure figcaption {
            padding: 12px 16px;
            font-size: 0.85rem;
            color: var(--slate-muted);
            line-height: 1.6;
        }
        .page-header-band {
            background: linear-gradient(135deg, #EFF6FF 0%, #F5F8FB 45%, #F0FDF4 100%);
            position: relative;
            overflow: hidden;
        }
        .page-header-band::after {
            content: '';
            position: absolute;
            right: -80px;
            top: -60px;
            width: 280px;
            height: 280px;
            border-radius: 50%;
            background: rgba(37, 99, 235, 0.04);
            pointer-events: none;
        }
        .page-header-band::before {
            content: '';
            position: absolute;
            left: -40px;
            bottom: -80px;
            width: 220px;
            height: 220px;
            border-radius: 50%;
            background: rgba(22, 163, 74, 0.04);
            pointer-events: none;
        }
        .method-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }
        .method-item {
            background: #F8FAFC;
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            padding: 16px 18px;
            text-align: center;
        }
        .method-item .method-icon {
            font-size: 1.5rem;
            color: var(--brand);
            margin-bottom: 8px;
        }
        .method-item .method-name {
            font-weight: 700;
            font-size: 0.9rem;
            color: var(--ink);
        }
        .method-item .method-desc {
            font-size: 0.8rem;
            color: var(--slate-muted);
            margin-top: 4px;
            line-height: 1.5;
        }
        .category-link-card {
            display: flex;
            align-items: center;
            gap: 14px;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-xl);
            padding: 14px 18px;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .category-link-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
            border-color: var(--brand);
        }
        .category-link-card img {
            width: 52px;
            height: 52px;
            border-radius: 12px;
            object-fit: cover;
            flex-shrink: 0;
        }
        .category-link-card .cat-name {
            font-weight: 700;
            font-size: 0.95rem;
            color: var(--ink);
        }
        .category-link-card .cat-desc {
            font-size: 0.78rem;
            color: var(--slate-muted);
            line-height: 1.5;
        }
        @media (max-width: 1024px) {
            .method-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
            .section {
                padding: 40px 0;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .header-inner {
                flex-wrap: nowrap;
                gap: 10px;
            }
            .logo-link {
                font-size: 1rem;
                gap: 6px;
            }
            .logo-mark {
                width: 28px;
                height: 28px;
                border-radius: 8px;
                font-size: 0.8rem;
            }
            .nav-chips {
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
            }
            .nav-chip {
                padding: 7px 13px;
                font-size: 0.8rem;
            }
            .btn-nav {
                padding: 7px 14px;
                font-size: 0.8rem;
            }
            .card-image-wrap img {
                height: 160px;
            }
            .stat-number {
                font-size: 1.8rem;
            }
            .data-method-box {
                padding: 18px 16px;
            }
            .gallery-figure img {
                height: 140px;
            }
        }
        @media (max-width: 520px) {
            .header-inner {
                gap: 6px;
            }
            .logo-link span.logo-text {
                display: none;
            }
            .btn-nav {
                padding: 6px 12px;
                font-size: 0.75rem;
            }
            .nav-chip {
                padding: 6px 11px;
                font-size: 0.75rem;
            }
            .section-title {
                font-size: 1.25rem;
            }
            .card-image-wrap img {
                height: 140px;
            }
            .method-grid {
                grid-template-columns: 1fr;
            }
            .category-link-card {
                flex-direction: column;
                text-align: center;
                gap: 8px;
            }
            .category-link-card img {
                width: 64px;
                height: 64px;
            }
        }

/* roulang page: category4 */
:root {
            --brand: #2563EB;
            --brand-dark: #1D4ED8;
            --field-green: #16A34A;
            --amber-warn: #F59E0B;
            --ink: #0F172A;
            --slate-body: #334155;
            --slate-muted: #64748B;
            --line: #E2E8F0;
            --page-bg: #F5F8FB;
            --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
            --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
            --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.12);
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --radius-2xl: 1.5rem;
            --radius-full: 9999px;
            --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            margin: 0;
            font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            font-size: 16px;
            line-height: 1.8;
            color: var(--slate-body);
            background-color: var(--page-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

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

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

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

        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--brand);
            outline-offset: 2px;
            border-radius: 4px;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--line);
            box-shadow: 0 1px 6px rgba(15, 23, 42, 0.04);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 12px 0;
        }

        .logo-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 800;
            font-size: 1.2rem;
            color: var(--ink);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }

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

        .logo-mark {
            width: 32px;
            height: 32px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 100%);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 0.9rem;
            flex-shrink: 0;
        }

        .nav-chips {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: nowrap;
            overflow-x: auto;
            scrollbar-width: none;
            -ms-overflow-style: none;
        }

        .nav-chips::-webkit-scrollbar {
            display: none;
        }

        .nav-chip {
            flex-shrink: 0;
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: var(--radius-full);
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--slate-body);
            background: #EDF2F7;
            transition: var(--transition);
            border: 1px solid transparent;
            white-space: nowrap;
        }

        .nav-chip:hover {
            background: #E2E8F0;
            color: var(--ink);
        }

        .nav-chip.active {
            background: var(--brand);
            color: #ffffff;
            border-color: var(--brand);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 22px;
            border-radius: var(--radius-xl);
            font-weight: 700;
            font-size: 0.95rem;
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid transparent;
            text-align: center;
        }

        .btn-primary {
            background: var(--brand);
            color: #fff;
            border-color: var(--brand);
        }

        .btn-primary:hover {
            background: var(--brand-dark);
            border-color: var(--brand-dark);
            box-shadow: 0 4px 16px rgba(37, 99, 235, 0.35);
            transform: translateY(-1px);
            color: #fff;
        }

        .btn-secondary {
            background: #ffffff;
            color: var(--brand);
            border-color: var(--brand);
        }

        .btn-secondary:hover {
            background: #EFF6FF;
            border-color: var(--brand-dark);
            color: var(--brand-dark);
            transform: translateY(-1px);
        }

        .btn-sm {
            padding: 7px 16px;
            font-size: 0.85rem;
        }

        .btn-lg {
            padding: 13px 28px;
            font-size: 1rem;
        }

        .section {
            padding: 56px 0;
        }

        .section-alt {
            background: #ffffff;
        }

        .section-title {
            font-size: 1.75rem;
            font-weight: 800;
            color: var(--ink);
            line-height: 1.35;
            margin: 0 0 8px;
        }

        .section-desc {
            font-size: 1rem;
            color: var(--slate-muted);
            max-width: 680px;
            line-height: 1.8;
            margin: 0 0 32px;
        }

        .card {
            background: #fff;
            border-radius: var(--radius-2xl);
            border: 1px solid var(--line);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            overflow: hidden;
        }

        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: #CBD5E1;
        }

        .card-image {
            width: 100%;
            height: 180px;
            object-fit: cover;
            display: block;
            background: #E2E8F0;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 4px 12px;
            border-radius: var(--radius-full);
            font-size: 0.78rem;
            font-weight: 600;
            white-space: nowrap;
        }

        .badge-blue {
            background: #EFF6FF;
            color: var(--brand);
        }

        .badge-green {
            background: #F0FDF4;
            color: var(--field-green);
        }

        .badge-amber {
            background: #FFFBEB;
            color: #B45309;
        }

        .badge-gray {
            background: #F1F5F9;
            color: var(--slate-muted);
        }

        .chip-filter {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            border-radius: var(--radius-full);
            font-size: 0.88rem;
            font-weight: 600;
            color: var(--slate-body);
            background: #EDF2F7;
            border: 1px solid transparent;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
            flex-shrink: 0;
        }

        .chip-filter:hover {
            background: #E2E8F0;
            color: var(--ink);
        }

        .chip-filter.active {
            background: var(--brand);
            color: #fff;
            border-color: var(--brand);
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 0.85rem;
            color: var(--slate-muted);
            margin-bottom: 12px;
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--brand);
            font-weight: 600;
        }

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

        .breadcrumb span {
            color: var(--slate-muted);
        }

        .page-header {
            background: #ffffff;
            border-bottom: 1px solid var(--line);
            padding: 40px 0 44px;
        }

        .page-header h1 {
            font-size: 2rem;
            font-weight: 800;
            color: var(--ink);
            line-height: 1.3;
            margin: 0 0 12px;
        }

        .page-header .page-desc {
            font-size: 1rem;
            color: var(--slate-muted);
            line-height: 1.8;
            max-width: 720px;
            margin: 0;
        }

        .hero-stack {
            display: grid;
            grid-template-columns: 1fr;
            gap: 16px;
        }

        .stack-card-main {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-2xl);
            box-shadow: var(--shadow-md);
            padding: 20px 24px;
            transition: var(--transition);
        }

        .stack-card-main:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
        }

        .stack-card-side {
            background: #F8FAFC;
            border: 1px solid var(--line);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-sm);
            padding: 14px 18px;
            transition: var(--transition);
        }

        .stack-card-side:hover {
            box-shadow: var(--shadow-md);
            border-color: #CBD5E1;
        }

        .gallery-card {
            display: flex;
            flex-direction: column;
            background: #fff;
            border-radius: var(--radius-2xl);
            border: 1px solid var(--line);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: var(--transition);
        }

        .gallery-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: #CBD5E1;
        }

        .gallery-card .gallery-img-wrap {
            position: relative;
            overflow: hidden;
            height: 190px;
        }

        .gallery-card .gallery-img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .gallery-card:hover .gallery-img {
            transform: scale(1.05);
        }

        .gallery-card .gallery-body {
            padding: 18px 20px 20px;
            display: flex;
            flex-direction: column;
            gap: 10px;
            flex: 1;
        }

        .gallery-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--ink);
            margin: 0;
            line-height: 1.4;
        }

        .gallery-card p {
            font-size: 0.9rem;
            color: var(--slate-muted);
            line-height: 1.7;
            margin: 0;
            flex: 1;
        }

        .stat-row {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 12px;
            padding-top: 4px;
        }

        .stat-item {
            background: #F8FAFC;
            border-radius: var(--radius-md);
            padding: 10px 14px;
            text-align: center;
        }

        .stat-item .stat-value {
            font-size: 1.15rem;
            font-weight: 800;
            color: var(--brand);
            line-height: 1.3;
        }

        .stat-item .stat-label {
            font-size: 0.76rem;
            color: var(--slate-muted);
            margin-top: 2px;
        }

        .data-strip {
            background: #F8FAFC;
            border: 1px solid var(--line);
            border-radius: var(--radius-2xl);
            padding: 32px 28px;
        }

        .data-strip .data-title {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 16px;
        }

        .data-strip p {
            font-size: 0.95rem;
            color: var(--slate-body);
            line-height: 1.85;
            margin: 0;
        }

        .gallery-visual-grid {
            display: grid;
            grid-template-columns: repeat(1, 1fr);
            gap: 16px;
        }

        .gallery-visual-item {
            border-radius: var(--radius-xl);
            overflow: hidden;
            background: #fff;
            border: 1px solid var(--line);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

        .gallery-visual-item:hover {
            box-shadow: var(--shadow-md);
        }

        .gallery-visual-item img {
            width: 100%;
            height: 160px;
            object-fit: cover;
        }

        .gallery-visual-item .gallery-caption {
            padding: 12px 16px;
            font-size: 0.82rem;
            color: var(--slate-muted);
            line-height: 1.6;
        }

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

        .faq-item:last-child {
            margin-bottom: 0;
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 18px 20px;
            cursor: pointer;
            user-select: none;
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--ink);
            background: #fff;
            border: none;
            width: 100%;
            text-align: left;
            transition: var(--transition);
        }

        .faq-question:hover {
            background: #F8FAFC;
        }

        .faq-question .faq-icon {
            flex-shrink: 0;
            transition: transform 0.3s ease;
            color: var(--brand);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 20px;
            font-size: 0.9rem;
            color: var(--slate-body);
            line-height: 1.8;
        }

        .faq-answer p {
            margin: 0;
            padding-bottom: 18px;
        }

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

        .faq-item.active .faq-answer {
            max-height: 300px;
            padding-top: 4px;
        }

        .cta-band {
            background: linear-gradient(135deg, #1E40AF 0%, #2563EB 50%, #3B82F6 100%);
            border-radius: var(--radius-2xl);
            padding: 40px 32px;
            color: #fff;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            border: none;
        }

        .cta-band h2 {
            font-size: 1.6rem;
            font-weight: 800;
            color: #fff;
            margin: 0 0 8px;
            line-height: 1.3;
        }

        .cta-band p {
            color: #BFDBFE;
            margin: 0;
            font-size: 0.95rem;
            line-height: 1.7;
        }

        .cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 28px;
            border-radius: var(--radius-xl);
            font-weight: 700;
            font-size: 0.95rem;
            background: #fff;
            color: var(--brand-dark);
            border: none;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }

        .cta-btn:hover {
            background: #EFF6FF;
            transform: translateY(-1px);
            box-shadow: 0 8px 24px rgba(0,0,0,0.18);
        }

        .footer {
            background: #0F172A;
            color: #94A3B8;
            padding: 56px 0 28px;
            margin-top: 40px;
        }

        .footer a {
            color: #94A3B8;
            transition: var(--transition);
        }

        .footer a:hover {
            color: #E2E8F0;
        }

        .footer-title {
            font-size: 0.95rem;
            font-weight: 700;
            color: #E2E8F0;
            margin: 0 0 14px;
        }

        .footer .footer-brand-text {
            font-size: 0.85rem;
            color: #94A3B8;
            margin: 0;
            line-height: 1.7;
        }

        .footer .footer-bottom {
            border-top: 1px solid #1E293B;
            padding-top: 16px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 0.8rem;
            color: #64748B;
        }

        @media (max-width: 1024px) {
            .container {
                padding: 0 18px;
            }
            .section {
                padding: 44px 0;
            }
            .page-header h1 {
                font-size: 1.7rem;
            }
            .cta-band {
                padding: 32px 24px;
                flex-direction: column;
                text-align: center;
                align-items: stretch;
            }
            .cta-band .cta-btn {
                justify-content: center;
            }
        }

        @media (max-width: 768px) {
            .header-inner {
                flex-wrap: wrap;
            }
            .nav-chips {
                order: 3;
                width: 100%;
                padding-bottom: 4px;
            }
            .section {
                padding: 32px 0;
            }
            .page-header {
                padding: 28px 0 32px;
            }
            .page-header h1 {
                font-size: 1.45rem;
            }
            .section-title {
                font-size: 1.3rem;
            }
            .gallery-card .gallery-img-wrap {
                height: 160px;
            }
            .stat-row {
                grid-template-columns: repeat(2, 1fr);
            }
            .data-strip {
                padding: 22px 18px;
            }
            .footer {
                padding: 40px 0 20px;
            }
            .faq-question {
                padding: 14px 16px;
                font-size: 0.88rem;
            }
            .faq-answer {
                padding: 0 16px;
                font-size: 0.85rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 12px;
            }
            .page-header h1 {
                font-size: 1.25rem;
            }
            .section-title {
                font-size: 1.15rem;
            }
            .gallery-card .gallery-img-wrap {
                height: 140px;
            }
            .cta-band h2 {
                font-size: 1.25rem;
            }
            .btn {
                padding: 9px 18px;
                font-size: 0.88rem;
            }
            .chip-filter {
                padding: 6px 14px;
                font-size: 0.8rem;
            }
            .stack-card-main {
                padding: 14px 16px;
            }
        }