/* roulang page: index */
:root {
            --primary: #3E7C6F;
            --primary-deep: #275A4E;
            --primary-soft: #E9F1EE;
            --accent: #E08B57;
            --accent-soft: #F9E9DE;
            --bg: #F7F4EF;
            --surface: #FFFFFF;
            --ink: #28362F;
            --muted: #66756E;
            --line: #E6DFD4;
            --radius-card: 1rem;
            --radius-btn: 9999px;
            --shadow-card: 0 4px 20px rgba(40,54,47,0.06);
            --shadow-hover: 0 14px 34px rgba(40,54,47,0.12);
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            background-color: var(--bg);
            color: var(--ink);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }

        section {
            scroll-margin-top: 96px;
        }

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

        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;
        }

        input,
        textarea {
            font-family: inherit;
        }

        .container {
            width: 100%;
            max-width: 72rem;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1rem;
            padding-right: 1rem;
        }

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

        .text-muted {
            color: var(--muted);
        }

        .text-primary {
            color: var(--primary);
        }

        .bg-primary-soft {
            background-color: var(--primary-soft);
        }

        .bg-accent {
            background-color: var(--accent);
        }

        .border-line {
            border-color: var(--line);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-height: 44px;
            padding: 0.625rem 1.75rem;
            border-radius: 9999px;
            font-weight: 600;
            font-size: 0.9375rem;
            line-height: 1.4;
            transition: all 0.25s ease;
            cursor: pointer;
            border: 1.5px solid transparent;
            white-space: nowrap;
        }

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

        .btn-primary {
            background-color: var(--accent);
            color: #fff;
            box-shadow: 0 4px 14px rgba(224, 139, 87, 0.35);
        }

        .btn-primary:hover {
            background-color: #d07a45;
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(224, 139, 87, 0.4);
        }

        .btn-primary:active {
            transform: scale(0.97);
        }

        .btn-outline {
            border-color: var(--primary);
            color: var(--primary);
            background-color: transparent;
        }

        .btn-outline:hover {
            background-color: rgba(62, 124, 111, 0.1);
            color: var(--primary-deep);
            transform: translateY(-2px);
        }

        .btn-outline:active {
            transform: scale(0.97);
        }

        .nav-link {
            font-size: 0.9375rem;
            font-weight: 500;
            color: var(--ink);
            padding: 0.5rem 1.125rem;
            border-radius: 9999px;
            transition: background-color 0.2s, color 0.2s;
        }

        .nav-link:hover {
            color: var(--primary);
            background-color: rgba(62, 124, 111, 0.06);
        }

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

        .card {
            background-color: var(--surface);
            border-radius: 1rem;
            border: 1px solid var(--line);
            box-shadow: var(--shadow-card);
            transition: box-shadow 0.3s ease, transform 0.3s ease;
        }

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

        .badge {
            display: inline-flex;
            align-items: center;
            gap: 0.25rem;
            padding: 0.25rem 0.875rem;
            border-radius: 9999px;
            font-size: 0.8125rem;
            font-weight: 500;
            background-color: var(--primary-soft);
            color: var(--primary);
        }

        .badge-accent {
            background-color: var(--accent-soft);
            color: var(--accent);
        }

        .input-field {
            width: 100%;
            height: 44px;
            padding: 0 1rem;
            border-radius: 0.75rem;
            border: 1.5px solid var(--line);
            background-color: var(--surface);
            font-size: 0.9375rem;
            color: var(--ink);
            transition: border-color 0.2s, box-shadow 0.2s;
        }

        .input-field:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(62, 124, 111, 0.15);
        }

        .section-title {
            font-size: clamp(1.5rem, 2.4vw, 2.125rem);
            line-height: 1.25;
            font-weight: 700;
            letter-spacing: -0.01em;
        }

        .section-number {
            font-size: 0.8125rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: 0.08em;
            text-transform: uppercase;
        }

        .faq-item {
            border-bottom: 1px solid var(--line);
        }

        .faq-item:last-child {
            border-bottom: none;
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 1.5rem 0;
            font-size: 1rem;
            font-weight: 600;
            color: var(--ink);
            background: none;
            border: none;
            cursor: pointer;
            text-align: left;
            gap: 1rem;
        }

        .faq-question .icon {
            position: relative;
            width: 20px;
            height: 20px;
            flex-shrink: 0;
        }

        .faq-question .icon::before,
        .faq-question .icon::after {
            content: '';
            position: absolute;
            background-color: var(--accent);
            border-radius: 2px;
            transition: transform 0.3s ease;
        }

        .faq-question .icon::before {
            width: 16px;
            height: 2px;
            top: 9px;
            left: 2px;
        }

        .faq-question .icon::after {
            width: 2px;
            height: 16px;
            top: 2px;
            left: 9px;
        }

        .faq-item.open .faq-question .icon::after {
            transform: scaleY(0);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            color: var(--muted);
            font-size: 0.9375rem;
            line-height: 1.75;
        }

        .faq-item.open .faq-answer {
            max-height: 500px;
            padding-bottom: 1.5rem;
        }

        .float-cta {
            position: fixed;
            bottom: 2rem;
            right: 1.5rem;
            z-index: 60;
            opacity: 0;
            visibility: hidden;
            transform: translateY(20px);
            transition: opacity 0.3s, transform 0.3s, visibility 0.3s;
        }

        .float-cta.show {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        .data-card {
            position: relative;
            padding: 1.75rem 1rem;
            text-align: center;
        }

        .data-card + .data-card::before {
            content: '';
            position: absolute;
            left: 0;
            top: 25%;
            bottom: 25%;
            width: 1px;
            background-color: var(--line);
        }

        @media (max-width: 768px) {
            .nav-menu-desktop {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
        }

        @media (min-width: 769px) {
            .nav-toggle {
                display: none;
            }
        }

        .mobile-nav-panel {
            display: none;
            position: fixed;
            top: 84px;
            left: 1rem;
            right: 1rem;
            background-color: rgba(247, 244, 239, 0.98);
            border-radius: 1.25rem;
            border: 1px solid var(--line);
            box-shadow: 0 20px 40px rgba(40, 54, 47, 0.12);
            padding: 1rem;
            z-index: 55;
            backdrop-filter: blur(12px);
        }

        .mobile-nav-panel.open {
            display: block;
        }

        .mobile-nav-panel a {
            display: block;
            padding: 0.75rem 1rem;
            border-radius: 0.75rem;
            font-weight: 500;
            color: var(--ink);
        }

        .mobile-nav-panel a:hover {
            background-color: var(--primary-soft);
            color: var(--primary);
        }

        .mobile-nav-panel a.active {
            background-color: var(--primary-soft);
            color: var(--primary);
            font-weight: 600;
        }

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

/* roulang page: category1 */
:root {
            --primary: #3E7C6F;
            --primary-deep: #275A4E;
            --primary-soft: #E9F1EE;
            --accent: #E08B57;
            --accent-soft: #F9E9DE;
            --bg: #F7F4EF;
            --surface: #FFFFFF;
            --ink: #28362F;
            --muted: #66756E;
            --line: #E6DFD4;
            --radius: 1rem;
            --shadow: 0 4px 20px rgba(40, 54, 47, 0.06);
            --shadow-lg: 0 14px 34px rgba(40, 54, 47, 0.12);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            background: var(--bg);
            color: var(--ink);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }

        .container {
            max-width: 72rem;
            margin: 0 auto;
            padding: 0 1rem;
        }

        @media (min-width: 768px) {
            .container {
                padding: 0 1.5rem;
            }
        }

        section {
            scroll-margin-top: 96px;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color .2s;
        }

        a:focus-visible {
            outline: 2px solid rgba(224, 139, 87, 0.6);
            outline-offset: 2px;
            border-radius: 4px;
        }

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

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-height: 46px;
            padding: 0 1.75rem;
            border-radius: 9999px;
            font-weight: 600;
            font-size: 0.9375rem;
            line-height: 1.2;
            border: 1.5px solid transparent;
            transition: all .25s ease;
            cursor: pointer;
            white-space: nowrap;
        }

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

        .btn-primary:hover {
            background: #c7784a;
            border-color: #c7784a;
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }

        .btn-primary:active {
            transform: scale(0.97);
        }

        .btn-outline {
            border: 1.5px solid var(--primary);
            color: var(--primary);
            background: transparent;
        }

        .btn-outline:hover {
            background: rgba(62, 124, 111, 0.08);
            border-color: var(--primary-deep);
        }

        .btn-outline:active {
            transform: scale(0.97);
        }

        .btn:focus-visible {
            outline: 3px solid rgba(224, 139, 87, 0.5);
            outline-offset: 2px;
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 0.5rem 0.875rem;
            border-radius: 9999px;
            font-size: 0.875rem;
            font-weight: 500;
            color: var(--muted);
            transition: all .2s;
            white-space: nowrap;
        }

        .nav-link:hover {
            color: var(--primary);
            background: var(--primary-soft);
        }

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

        .nav-toggle {
            display: none;
            align-items: center;
            justify-content: center;
            width: 2.5rem;
            height: 2.5rem;
            border-radius: 9999px;
            border: 1px solid var(--line);
            background: var(--surface);
            color: var(--ink);
            transition: border-color .2s;
            cursor: pointer;
        }

        .nav-toggle:hover {
            border-color: var(--primary);
        }

        .mobile-nav-panel {
            max-width: 36rem;
            margin: 0.5rem auto 0;
            background: var(--bg);
            border: 1px solid var(--line);
            border-radius: 1.25rem;
            padding: 1rem;
            box-shadow: var(--shadow);
            display: none;
        }

        .mobile-nav-panel .nav-link {
            display: flex;
            width: 100%;
            margin-bottom: 0.25rem;
        }

        .mobile-nav-panel a:last-of-type {
            margin-bottom: 0;
        }

        .faq-item {
            transition: background .3s;
        }

        .faq-question {
            cursor: pointer;
            background: none;
            border: none;
            padding: 0;
            font-family: inherit;
            font-size: 1rem;
            font-weight: 600;
            color: var(--ink);
            text-align: left;
            width: 100%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
            min-height: 3rem;
        }

        .faq-icon {
            position: relative;
            flex-shrink: 0;
            width: 1.75rem;
            height: 1.75rem;
            border-radius: 9999px;
            border: 1.5px solid var(--accent);
            color: var(--accent);
            background: var(--accent-soft);
        }

        .faq-icon::before,
        .faq-icon::after {
            content: "";
            position: absolute;
            background: currentColor;
            border-radius: 2px;
            transition: transform .3s ease, opacity .3s ease;
        }

        .faq-icon::before {
            width: 10px;
            height: 2px;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
        }

        .faq-icon::after {
            width: 2px;
            height: 10px;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
        }

        .faq-item.open .faq-icon::after {
            transform: translate(-50%, -50%) rotate(90deg);
            opacity: 0;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s ease;
        }

        .faq-answer-inner {
            padding-bottom: 0.5rem;
        }

        .nav-scrolled {
            background: rgba(247, 244, 239, 0.95) !important;
            box-shadow: 0 6px 24px rgba(40, 54, 47, 0.12) !important;
        }

        .float-cta {
            position: fixed;
            right: 1.5rem;
            bottom: 1.5rem;
            z-index: 45;
            display: flex;
            align-items: center;
            justify-content: center;
            width: 3.5rem;
            height: 3.5rem;
            border-radius: 9999px;
            background: var(--accent);
            color: #fff;
            box-shadow: 0 8px 30px rgba(40, 54, 47, 0.18);
            opacity: 0;
            transform: translateY(16px);
            pointer-events: none;
            transition: all .35s ease;
        }

        .float-cta.visible {
            opacity: 1;
            transform: translateY(0);
            pointer-events: auto;
        }

        .float-cta:hover {
            background: #c7784a;
        }

        @media (max-width: 767px) {
            .nav-toggle {
                display: flex;
            }
            .nav-menu-desktop {
                display: none !important;
            }
            .float-cta {
                right: 1rem;
                bottom: 1rem;
                width: 3rem;
                height: 3rem;
            }
        }

        @media (min-width: 768px) {
            .mobile-nav-panel {
                display: none !important;
            }
        }

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

        .grid-pattern {
            background-image: radial-gradient(rgba(62, 124, 111, 0.1) 1px, transparent 1px);
            background-size: 24px 24px;
        }

        .step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 2.5rem;
            height: 2.5rem;
            border-radius: 9999px;
            background: var(--primary-soft);
            color: var(--primary);
            font-weight: 700;
            font-size: 1rem;
        }

        .icon-wrap {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 3rem;
            height: 3rem;
            border-radius: 9999px;
            background: var(--primary-soft);
            color: var(--primary);
            flex-shrink: 0;
        }

        .card-hover {
            transition: transform .3s ease, box-shadow .3s ease;
        }

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

/* roulang page: article */
:root {
            --primary: #3E7C6F;
            --primary-deep: #275A4E;
            --primary-soft: #E9F1EE;
            --accent: #E08B57;
            --accent-soft: #F9E9DE;
            --bg: #F7F4EF;
            --surface: #FFFFFF;
            --ink: #28362F;
            --muted: #66756E;
            --line: #E6DFD4;
            --radius-card: 1rem;
            --radius-btn: 9999px;
            --shadow-card: 0 4px 20px rgba(40,54,47,0.06);
            --shadow-hover: 0 14px 34px rgba(40,54,47,0.12);
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            background: var(--bg);
            color: var(--ink);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        .container {
            max-width: 1152px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        section {
            scroll-margin-top: 96px;
        }
        img {
            max-width: 100%;
            height: auto;
        }
        a {
            color: inherit;
            text-decoration: none;
        }
        button {
            cursor: pointer;
        }
        :focus-visible {
            outline: 3px solid rgba(224, 139, 87, 0.5);
            outline-offset: 2px;
        }
        .article-hero {
            background: linear-gradient(135deg, rgba(39, 90, 78, 0.92), rgba(62, 124, 111, 0.82)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
        }
        .breadcrumb a {
            color: rgba(255, 255, 255, 0.75);
            transition: color 0.2s;
        }
        .breadcrumb a:hover {
            color: #fff;
        }
        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 0.5rem 1rem;
            border-radius: 9999px;
            font-size: 0.925rem;
            font-weight: 500;
            color: var(--ink);
            transition: all 0.2s ease;
        }
        .nav-link:hover {
            background: var(--primary-soft);
            color: var(--primary-deep);
        }
        .nav-link.active {
            background: var(--primary-soft);
            color: var(--primary);
            font-weight: 600;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-height: 44px;
            padding: 0 1.5rem;
            border-radius: 9999px;
            font-weight: 600;
            font-size: 0.95rem;
            text-decoration: none;
            transition: all 0.2s ease;
            cursor: pointer;
            border: 2px solid transparent;
            line-height: 1;
        }
        .btn:active {
            transform: scale(0.97);
        }
        .btn-primary {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
        }
        .btn-primary:hover {
            background: #c97846;
            border-color: #c97846;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(224, 139, 87, 0.35);
        }
        .btn-outline {
            border-color: var(--primary);
            color: var(--primary);
            background: transparent;
        }
        .btn-outline:hover {
            background: rgba(62, 124, 111, 0.1);
        }
        .btn-outline-white {
            border-color: rgba(255, 255, 255, 0.65);
            color: #fff;
            background: transparent;
        }
        .btn-outline-white:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #fff;
        }
        .tag {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            border-radius: 9999px;
            background: var(--primary-soft);
            color: var(--primary-deep);
            font-size: 0.8125rem;
            font-weight: 600;
            line-height: 1.4;
        }
        .article-content {
            font-size: 1rem;
            line-height: 1.9;
            color: var(--ink);
        }
        .article-content h2 {
            font-size: 1.5rem;
            font-weight: 700;
            margin: 2rem 0 1rem;
            padding-top: 0.75rem;
            border-top: 1px solid var(--line);
            line-height: 1.3;
        }
        .article-content h2:first-child {
            border-top: none;
            padding-top: 0;
        }
        .article-content h3 {
            font-size: 1.125rem;
            font-weight: 700;
            margin: 1.5rem 0 0.75rem;
            line-height: 1.4;
        }
        .article-content p {
            margin: 1.25em 0;
        }
        .article-content ul,
        .article-content ol {
            margin: 1.25em 0;
            padding-left: 1.5rem;
        }
        .article-content ul {
            list-style: disc;
        }
        .article-content ol {
            list-style: decimal;
        }
        .article-content li {
            margin: 0.5em 0;
        }
        .article-content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-soft);
            padding: 1rem 1.25rem;
            margin: 1.5rem 0;
            border-radius: 0 12px 12px 0;
            color: var(--muted);
        }
        .article-content img {
            max-width: 100%;
            height: auto;
            border-radius: 12px;
            margin: 1.5rem 0;
            box-shadow: var(--shadow-card);
        }
        .article-content figure {
            margin: 1.5rem 0;
        }
        .article-content figcaption {
            text-align: center;
            font-size: 0.875rem;
            color: var(--muted);
            margin-top: 0.5rem;
        }
        .article-content hr {
            border: none;
            border-top: 1px solid var(--line);
            margin: 2.5rem 0;
        }
        .article-content a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .article-content code {
            background: var(--primary-soft);
            padding: 0.15rem 0.4rem;
            border-radius: 4px;
            font-size: 0.9em;
        }
        .article-content pre {
            background: var(--primary-deep);
            color: #f1f7f4;
            padding: 1.25rem;
            border-radius: 12px;
            overflow-x: auto;
            margin: 1.5rem 0;
            font-size: 0.9rem;
            line-height: 1.7;
        }
        .article-content pre code {
            background: transparent;
            padding: 0;
            color: inherit;
        }
        .mobile-nav-panel {
            position: absolute;
            left: 1rem;
            right: 1rem;
            top: calc(100% + 0.5rem);
            background: rgba(247, 244, 239, 0.96);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--line);
            border-radius: 1rem;
            padding: 0.75rem;
            box-shadow: 0 16px 40px rgba(40, 54, 47, 0.14);
            z-index: 60;
        }
        .mobile-nav-panel .nav-link {
            display: block;
            padding: 0.65rem 0.9rem;
            border-radius: 0.75rem;
            margin-bottom: 0.15rem;
            font-size: 0.95rem;
        }
        .mobile-nav-panel .btn {
            margin-top: 0.5rem;
        }
        .line-clamp-2 {
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .card-hover {
            transition: transform 0.25s ease, box-shadow 0.25s ease;
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        @media (max-width: 767px) {
            .container {
                padding: 0 1rem;
            }
            .article-content {
                font-size: 0.95rem;
            }
        }
        @media (prefers-reduced-motion: reduce) {
            html {
                scroll-behavior: auto;
            }
            .card-hover,
            .btn,
            .nav-link {
                transition: none;
            }
        }

/* roulang page: category2 */
:root {
            --primary: #3E7C6F;
            --primary-deep: #275A4E;
            --primary-soft: #E9F1EE;
            --accent: #E08B57;
            --accent-soft: #F9E9DE;
            --bg: #F7F4EF;
            --surface: #FFFFFF;
            --ink: #28362F;
            --muted: #66756E;
            --line: #E6DFD4;
            --radius-lg: 1.5rem;
            --radius-md: 1rem;
            --radius-sm: 0.75rem;
            --shadow-card: 0 4px 20px rgba(40, 54, 47, 0.06);
            --shadow-hover: 0 14px 34px rgba(40, 54, 47, 0.12);
            --shadow-float: 0 8px 30px rgba(40, 54, 47, 0.18);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            background-color: var(--bg);
            color: var(--ink);
            line-height: 1.75;
            font-size: 1rem;
        }

        section {
            scroll-margin-top: 96px;
        }

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

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

        .container {
            max-width: 72rem;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1rem;
            padding-right: 1rem;
        }

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

        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 0.5rem 0.875rem;
            border-radius: 9999px;
            font-size: 0.875rem;
            font-weight: 500;
            color: var(--muted);
            transition: background-color 0.2s, color 0.2s;
            white-space: nowrap;
        }

        .nav-link:hover {
            color: var(--primary);
            background-color: var(--primary-soft);
        }

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

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            min-height: 44px;
            padding: 0.625rem 1.5rem;
            border-radius: 9999px;
            font-size: 0.9375rem;
            font-weight: 600;
            transition: all 0.25s ease;
            cursor: pointer;
            border: 1px solid transparent;
        }

        .btn:focus-visible {
            outline: 3px solid rgba(224, 139, 87, 0.5);
            outline-offset: 2px;
        }

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

        .btn-primary:hover {
            background-color: #c9743f;
            transform: translateY(-2px);
            box-shadow: var(--shadow-float);
        }

        .btn-primary:active {
            transform: scale(0.97);
        }

        .btn-outline {
            background: transparent;
            border: 1.5px solid var(--primary);
            color: var(--primary);
        }

        .btn-outline:hover {
            background-color: rgba(62, 124, 111, 0.1);
        }

        .btn-outline:active {
            transform: scale(0.97);
        }

        .card {
            background: var(--surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--line);
            box-shadow: var(--shadow-card);
            transition: box-shadow 0.25s, transform 0.25s;
        }

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

        .badge {
            display: inline-flex;
            align-items: center;
            padding: 0.25rem 0.75rem;
            border-radius: 9999px;
            font-size: 0.75rem;
            font-weight: 600;
            background-color: var(--primary-soft);
            color: var(--primary);
        }

        .badge-accent {
            background-color: var(--accent-soft);
            color: var(--accent);
        }

        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.875rem;
            font-weight: 600;
            color: var(--primary);
            letter-spacing: 0.05em;
            text-transform: uppercase;
        }

        .section-label::before {
            content: '';
            display: block;
            width: 1.5rem;
            height: 2px;
            background-color: var(--accent);
            border-radius: 2px;
        }

        .text-display {
            font-size: clamp(2.125rem, 4vw, 3.25rem);
            line-height: 1.15;
            font-weight: 800;
        }

        .text-section {
            font-size: clamp(1.5rem, 2.4vw, 2.125rem);
            line-height: 1.25;
            font-weight: 700;
        }

        .text-card-title {
            font-size: 1.125rem;
            font-weight: 700;
            line-height: 1.4;
        }

        .text-body {
            font-size: 1rem;
            line-height: 1.75;
        }

        .text-muted {
            color: var(--muted);
        }

        .mobile-nav-panel {
            position: fixed;
            top: calc(4rem + 1rem);
            left: 1rem;
            right: 1rem;
            z-index: 40;
            background: var(--bg);
            border: 1px solid var(--line);
            border-radius: 1.5rem;
            padding: 1.25rem;
            box-shadow: var(--shadow-hover);
        }

        .mobile-nav-panel a {
            display: block;
            padding: 0.625rem 0.875rem;
            border-radius: 0.75rem;
            font-size: 1rem;
            font-weight: 500;
            color: var(--ink);
        }

        .mobile-nav-panel a:hover {
            background-color: var(--primary-soft);
            color: var(--primary);
        }

        .faq-item {
            border-bottom: 1px solid var(--line);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            padding: 1.25rem 0;
            font-size: 1rem;
            font-weight: 600;
            color: var(--ink);
            background: transparent;
            border: none;
            cursor: pointer;
            text-align: left;
        }

        .faq-question:focus-visible {
            outline: 3px solid rgba(62, 124, 111, 0.4);
        }

        .faq-icon {
            position: relative;
            width: 24px;
            height: 24px;
            flex-shrink: 0;
        }

        .faq-icon::before,
        .faq-icon::after {
            content: '';
            position: absolute;
            background: var(--accent);
            border-radius: 2px;
            transition: transform 0.3s;
        }

        .faq-icon::before {
            left: 4px;
            right: 4px;
            top: 11px;
            height: 2px;
        }

        .faq-icon::after {
            top: 4px;
            bottom: 4px;
            left: 11px;
            width: 2px;
        }

        .faq-item[open] .faq-icon::after {
            transform: scaleY(0);
        }

        .faq-answer {
            padding-bottom: 1.25rem;
            color: var(--muted);
            font-size: 0.9375rem;
        }

        .footer-link:hover {
            color: #fff;
            text-decoration: underline;
            text-underline-offset: 4px;
        }

        .cta-float {
            position: fixed;
            right: 1.25rem;
            bottom: 1.25rem;
            z-index: 40;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.75rem 1.25rem;
            border-radius: 9999px;
            background: var(--primary-deep);
            color: #fff;
            font-size: 0.875rem;
            font-weight: 600;
            box-shadow: var(--shadow-float);
            transition: transform 0.25s, opacity 0.25s;
            opacity: 0;
            pointer-events: none;
            transform: translateY(12px);
        }

        .cta-float.visible {
            opacity: 1;
            pointer-events: auto;
            transform: translateY(0);
        }

        .cta-float:hover {
            background: var(--primary);
            transform: translateY(-2px);
        }

        .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.18;
            z-index: -1;
        }

        .demo-step {
            border-left: 2px solid var(--primary-soft);
            padding-left: 1.5rem;
            position: relative;
        }

        .demo-step::before {
            content: '';
            position: absolute;
            left: -7px;
            top: 4px;
            width: 12px;
            height: 12px;
            border-radius: 9999px;
            background: var(--accent);
            border: 2px solid var(--surface);
        }

        .stat-number {
            font-size: clamp(2rem, 3vw, 2.75rem);
            font-weight: 800;
            color: var(--primary-deep);
            line-height: 1.2;
        }

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

/* roulang page: category3 */
:root {
            --primary: #3E7C6F;
            --primary-deep: #275A4E;
            --primary-soft: #E9F1EE;
            --accent: #E08B57;
            --accent-soft: #F9E9DE;
            --bg: #F7F4EF;
            --surface: #FFFFFF;
            --ink: #28362F;
            --muted: #66756E;
            --line: #E6DFD4;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --shadow-card: 0 4px 20px rgba(40, 54, 47, 0.06);
            --shadow-hover: 0 14px 34px rgba(40, 54, 47, 0.12);
            --shadow-float: 0 8px 30px rgba(40, 54, 47, 0.18);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            background: var(--bg);
            color: var(--ink);
            line-height: 1.75;
            font-size: 1rem;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.2s ease;
        }

        button {
            font-family: inherit;
        }

        .container {
            max-width: 72rem;
            margin: 0 auto;
            padding: 0 1.25rem;
        }

        section {
            scroll-margin-top: 96px;
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            font-size: 0.875rem;
            font-weight: 500;
            color: var(--muted);
            padding: 0.5rem 0.875rem;
            border-radius: 9999px;
            transition: all 0.2s ease;
            white-space: nowrap;
        }

        .nav-link:hover {
            color: var(--primary);
            background: var(--primary-soft);
        }

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

        .nav-scrolled {
            background: rgba(247, 244, 239, 0.95) !important;
            box-shadow: 0 8px 24px rgba(40, 54, 47, 0.12) !important;
        }

        .nav-menu-desktop {
            display: none;
        }

        .mobile-nav-panel {
            max-width: 64rem;
            margin: 0.5rem auto 0;
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: 1rem;
            padding: 1rem;
            box-shadow: var(--shadow-card);
            flex-direction: column;
            gap: 0.25rem;
        }

        @media (min-width: 768px) {
            .nav-menu-desktop {
                display: flex;
            }
            .nav-toggle {
                display: none;
            }
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            min-height: 44px;
            padding: 0.625rem 1.5rem;
            border-radius: 9999px;
            font-weight: 600;
            font-size: 0.9375rem;
            transition: all 0.2s ease;
            cursor: pointer;
            border: 1.5px solid transparent;
            white-space: nowrap;
        }

        .btn-primary {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 4px 14px rgba(224, 139, 87, 0.28);
        }

        .btn-primary:hover {
            background: #c97a4a;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(224, 139, 87, 0.38);
        }

        .btn-primary:active {
            transform: scale(0.97);
        }

        .btn-outline {
            background: transparent;
            border-color: var(--primary);
            color: var(--primary);
        }

        .btn-outline:hover {
            background: var(--primary-soft);
            transform: translateY(-2px);
        }

        .btn-outline:active {
            transform: scale(0.97);
        }

        .btn-white-outline {
            background: transparent;
            border-color: rgba(255, 255, 255, 0.55);
            color: #fff;
        }

        .btn-white-outline:hover {
            background: rgba(255, 255, 255, 0.12);
            transform: translateY(-2px);
        }

        .btn-white-outline:active {
            transform: scale(0.97);
        }

        .btn:focus-visible {
            outline: 3px solid rgba(224, 139, 87, 0.5);
            outline-offset: 2px;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            padding: 0.375rem 0.875rem;
            background: var(--primary-soft);
            color: var(--primary);
            border-radius: 9999px;
            font-size: 0.8125rem;
            font-weight: 600;
        }

        .section-no {
            display: inline-flex;
            align-items: center;
            font-size: 0.875rem;
            font-weight: 700;
            color: var(--accent);
            letter-spacing: 0.1em;
            margin-bottom: 0.75rem;
        }

        h1 {
            font-size: clamp(2.125rem, 4vw, 3.25rem);
            line-height: 1.15;
            font-weight: 800;
            letter-spacing: -0.01em;
        }

        h2 {
            font-size: clamp(1.5rem, 2.4vw, 2.125rem);
            line-height: 1.25;
            font-weight: 700;
        }

        h3 {
            font-size: 1.125rem;
            line-height: 1.4;
            font-weight: 700;
        }

        .hero-sub {
            font-size: clamp(1rem, 1.4vw, 1.125rem);
            color: var(--muted);
            line-height: 1.75;
            margin-top: 1.25rem;
            max-width: 34rem;
        }

        .feature-card {
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: 1.25rem;
            padding: 1.75rem;
            transition: all 0.25s ease;
            box-shadow: var(--shadow-card);
        }

        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(62, 124, 111, 0.4);
        }

        .feature-card .icon-wrap {
            width: 48px;
            height: 48px;
            border-radius: 9999px;
            background: var(--primary-soft);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            margin-bottom: 1rem;
            transition: background 0.2s ease;
        }

        .feature-card:hover .icon-wrap {
            background: var(--accent-soft);
            color: var(--accent);
        }

        .link-card {
            display: block;
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: 1.25rem;
            padding: 2rem;
            transition: all 0.25s ease;
            box-shadow: var(--shadow-card);
        }

        .link-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(62, 124, 111, 0.45);
        }

        .link-card .arrow {
            display: inline-flex;
            align-items: center;
            gap: 0.375rem;
            color: var(--primary);
            font-weight: 600;
            font-size: 0.9375rem;
            margin-top: 1rem;
        }

        .link-card .arrow svg {
            transition: transform 0.2s ease;
        }

        .link-card:hover .arrow svg {
            transform: translateX(4px);
        }

        .step-num {
            flex-shrink: 0;
            width: 2.5rem;
            height: 2.5rem;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 9999px;
            background: rgba(255, 255, 255, 0.12);
            border: 1px solid rgba(255, 255, 255, 0.2);
            font-weight: 700;
            font-size: 0.9375rem;
            color: var(--accent);
        }

        .faq-item {
            border-bottom: 1px solid var(--line);
        }

        .faq-question {
            width: 100%;
            text-align: left;
            padding: 1.25rem 0;
            font-size: 1rem;
            font-weight: 600;
            background: none;
            border: none;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--ink);
            transition: color 0.2s ease;
        }

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

        .faq-question::after {
            content: '+';
            font-size: 1.5rem;
            font-weight: 300;
            color: var(--accent);
            transition: transform 0.3s ease;
            line-height: 1;
        }

        .faq-item.open .faq-question::after {
            transform: rotate(45deg);
        }

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

        .faq-answer p {
            padding: 0 0 1.25rem;
            color: var(--muted);
            font-size: 0.9375rem;
            line-height: 1.75;
        }

        .float-cta {
            position: fixed;
            right: 1.25rem;
            bottom: 1.25rem;
            z-index: 50;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            background: var(--accent);
            color: #fff;
            padding: 0.75rem 1.25rem;
            border-radius: 9999px;
            font-weight: 600;
            font-size: 0.9375rem;
            box-shadow: var(--shadow-float);
            opacity: 0;
            transform: translateY(20px);
            pointer-events: none;
            transition: all 0.3s ease;
        }

        .float-cta.visible {
            opacity: 1;
            transform: translateY(0);
            pointer-events: auto;
        }

        .float-cta:hover {
            background: #c97a4a;
        }

        .float-cta:focus-visible {
            outline: 3px solid rgba(224, 139, 87, 0.5);
            outline-offset: 2px;
        }

        @media (min-width: 768px) {
            .float-cta {
                right: 2rem;
                bottom: 2rem;
            }
        }

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