/* roulang page: index */
:root {
            --primary: #2D6FF0;
            --primary-dark: #1E4FC4;
            --accent: #10A891;
            --warm: #F27059;
            --bg: #F5F8FC;
            --card: #FFFFFF;
            --border: #E1E9F3;
            --text: #233247;
            --text-weak: #6C7A91;
            --text-deep: #16243A;
            --radius-lg: 28px;
            --radius-md: 18px;
            --radius-pill: 999px;
            --shadow-card: 0 6px 24px rgba(19, 52, 110, 0.06);
            --shadow-hover: 0 12px 30px rgba(19, 52, 110, 0.12);
            --space-section: 100px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            font-size: 17px;
            line-height: 1.8;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            text-rendering: optimizeLegibility;
        }

        body,
        h1,
        h2,
        h3,
        h4,
        p,
        ul,
        figure {
            margin: 0;
            padding: 0;
        }

        ul {
            list-style: none;
        }

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

        a {
            color: inherit;
            text-decoration: none;
            transition: all .25s ease;
        }

        button,
        input,
        select,
        textarea {
            font: inherit;
            color: inherit;
        }

        ::selection {
            background: #D8E7FF;
            color: var(--text-deep);
        }

        .grid-container {
            max-width: 1180px;
            padding-left: 20px;
            padding-right: 20px;
        }

        .section-pad {
            padding-top: var(--space-section);
            padding-bottom: var(--space-section);
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible,
        summary:focus-visible {
            outline: 3px solid rgba(45, 111, 240, .3);
            outline-offset: 2px;
        }

        .section-head {
            max-width: 780px;
            margin: 0 auto 56px;
            text-align: center;
        }

        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 7px 18px;
            border-radius: var(--radius-pill);
            background: #E9F1FE;
            color: var(--primary-dark);
            font-size: 14px;
            font-weight: 700;
            letter-spacing: .4px;
            margin-bottom: 16px;
        }

        .eyebrow i {
            font-size: 13px;
            color: var(--accent);
        }

        .section-head h2 {
            font-size: 36px;
            line-height: 1.35;
            font-weight: 800;
            color: var(--text-deep);
            margin-bottom: 14px;
        }

        .section-head p {
            font-size: 17px;
            color: var(--text-weak);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 52px;
            padding: 0 30px;
            border: 0;
            border-radius: var(--radius-pill);
            font-size: 16px;
            font-weight: 700;
            cursor: pointer;
            transition: all .25s ease;
        }

        .btn i {
            font-size: 15px;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 8px 18px rgba(45, 111, 240, .22);
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: 0 10px 24px rgba(30, 79, 196, .28);
            transform: translateY(-2px);
            color: #fff;
        }

        .btn-primary:active {
            transform: translateY(1px);
            box-shadow: none;
        }

        .btn-warm {
            background: var(--warm);
            color: #fff;
            box-shadow: 0 8px 18px rgba(242, 112, 89, .22);
        }

        .btn-warm:hover {
            background: #D95B46;
            transform: translateY(-2px);
            color: #fff;
        }

        .btn-ghost {
            border: 1px solid rgba(255, 255, 255, .88);
            background: rgba(255, 255, 255, .08);
            color: #fff;
        }

        .btn-ghost:hover {
            background: rgba(255, 255, 255, .18);
            border-color: #fff;
            color: #fff;
        }

        .btn-light {
            background: #fff;
            color: var(--primary-dark);
            box-shadow: 0 8px 20px rgba(19, 52, 110, .12);
        }

        .btn-light:hover {
            background: #E9F1FE;
            color: var(--primary-dark);
            transform: translateY(-2px);
        }

        .link-more {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--primary);
            font-weight: 700;
            font-size: 15px;
        }

        .link-more:hover {
            color: var(--primary-dark);
            gap: 10px;
        }

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

        .badge-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 14px;
            border-radius: var(--radius-pill);
            font-size: 13px;
            font-weight: 700;
            background: rgba(16, 168, 145, .12);
            color: #0B8A76;
        }

        /* ---------- Header / Dock Nav ---------- */
        .site-header {
            position: sticky;
            top: 16px;
            z-index: 1000;
            width: calc(100% - 32px);
            max-width: 1180px;
            margin: 18px auto 0;
        }

        .header-shell {
            position: relative;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            height: 68px;
            padding: 0 16px 0 24px;
            border: 1px solid rgba(225, 233, 243, .95);
            border-radius: var(--radius-pill);
            background: rgba(255, 255, 255, .86);
            box-shadow: 0 8px 28px rgba(19, 52, 110, .08);
            backdrop-filter: saturate(150%) blur(16px);
            -webkit-backdrop-filter: saturate(150%) blur(16px);
        }

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

        .brand-mark {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 42px;
            height: 42px;
            border-radius: 14px;
            background: linear-gradient(145deg, #2D6FF0, #1E4FC4);
            color: #fff;
            font-size: 16px;
            font-weight: 900;
            letter-spacing: .5px;
            box-shadow: 0 6px 14px rgba(45, 111, 240, .25);
        }

        .brand-cn {
            font-size: 19px;
            font-weight: 900;
            color: var(--text-deep);
            line-height: 1.2;
        }

        .brand-cn small {
            display: block;
            font-size: 12px;
            font-weight: 600;
            color: var(--text-weak);
            letter-spacing: .5px;
            margin-top: 2px;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            padding: 4px;
            background: #EDF3FB;
            border-radius: var(--radius-pill);
        }

        .main-nav a {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: var(--radius-pill);
            font-size: 15px;
            font-weight: 700;
            color: #4B5C75;
            white-space: nowrap;
            transition: all .25s ease;
        }

        .main-nav a:hover {
            color: var(--primary-dark);
            background: rgba(255, 255, 255, .6);
        }

        .main-nav a.active {
            color: var(--primary-dark);
            background: #fff;
            box-shadow: 0 2px 10px rgba(19, 52, 110, .12);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 14px;
            flex-shrink: 0;
        }

        .nav-btn {
            height: 42px;
            padding: 0 20px;
            font-size: 14px;
        }

        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
            border: 1px solid var(--border);
            background: #fff;
            color: var(--primary-dark);
            border-radius: 50%;
            cursor: pointer;
            font-size: 18px;
            transition: all .25s ease;
        }

        .nav-toggle:hover {
            background: #E9F1FE;
            border-color: var(--primary);
        }

        @media (max-width: 900px) {
            .main-nav {
                position: absolute;
                top: calc(100% + 14px);
                left: 0;
                right: 0;
                display: none;
                flex-direction: column;
                align-items: stretch;
                gap: 6px;
                padding: 14px;
                border: 1px solid var(--border);
                border-radius: 22px;
                background: #fff;
                box-shadow: 0 18px 40px rgba(19, 52, 110, .12);
            }

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

            .main-nav a {
                justify-content: flex-start;
                padding: 12px 16px;
            }

            .nav-toggle {
                display: inline-flex;
            }

            .header-actions .btn {
                display: none;
            }
        }

        @media (max-width: 560px) {
            .site-header {
                width: calc(100% - 20px);
                top: 10px;
            }

            .header-shell {
                height: 60px;
                padding-left: 14px;
                padding-right: 10px;
                border-radius: 20px;
            }

            .brand-mark {
                width: 38px;
                height: 38px;
                border-radius: 12px;
                font-size: 14px;
            }

            .brand-cn {
                font-size: 16px;
            }

            .brand-cn small {
                font-size: 11px;
            }

            .main-nav {
                border-radius: 18px;
            }
        }

        /* ---------- Hero ---------- */
        .hero-wrap {
            margin-top: 28px;
        }

        .hero-card {
            position: relative;
            min-height: 620px;
            display: flex;
            align-items: center;
            border-radius: 34px;
            overflow: hidden;
            background: #172D56;
            box-shadow: 0 20px 52px rgba(18, 38, 82, .16);
        }

        .hero-media {
            position: absolute;
            inset: 0;
            background: url("/assets/images/backpic/back-1.png") center center / cover no-repeat;
        }

        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(108deg, rgba(15, 37, 78, .86) 0%, rgba(28, 59, 118, .65) 50%, rgba(45, 111, 240, .42) 100%);
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 820px;
            padding: 100px 60px 90px;
            color: #fff;
        }

        .hero-kicker {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 7px 18px;
            border-radius: var(--radius-pill);
            background: rgba(255, 255, 255, .14);
            border: 1px solid rgba(255, 255, 255, .18);
            font-size: 14px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 24px;
        }

        .hero-kicker i {
            color: #9ED7CA;
        }

        .hero-content h1 {
            font-size: 44px;
            line-height: 1.3;
            font-weight: 900;
            color: #fff;
            margin-bottom: 22px;
            letter-spacing: .5px;
        }

        .hero-content h1 .text-underline {
            border-bottom: 4px solid rgba(45, 168, 145, .7);
            padding-bottom: 2px;
        }

        .hero-sub {
            font-size: 18px;
            line-height: 1.8;
            color: rgba(255, 255, 255, .9);
            max-width: 680px;
            margin-bottom: 34px;
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px;
        }

        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 34px;
            margin-top: 44px;
            padding-top: 28px;
            border-top: 1px solid rgba(255, 255, 255, .18);
        }

        .hero-stats li {
            color: rgba(255, 255, 255, .78);
            font-size: 14px;
            line-height: 1.5;
        }

        .hero-stats strong {
            display: block;
            font-size: 26px;
            font-weight: 900;
            color: #fff;
            line-height: 1.3;
        }

        @media (max-width: 768px) {
            .hero-wrap {
                margin-top: 16px;
            }

            .hero-card {
                min-height: auto;
                border-radius: 24px;
            }

            .hero-content {
                padding: 70px 28px 56px;
            }

            .hero-content h1 {
                font-size: 31px;
            }

            .hero-sub {
                font-size: 16px;
            }

            .hero-stats {
                gap: 20px;
            }
        }

        @media (max-width: 520px) {
            .hero-content {
                padding: 54px 20px 44px;
            }

            .hero-content h1 {
                font-size: 26px;
            }

            .hero-stats strong {
                font-size: 22px;
            }

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

        /* ---------- Timeline Section ---------- */
        .timeline-section {
            background: var(--bg);
            padding: var(--space-section) 0;
        }

        .timeline {
            position: relative;
            max-width: 960px;
            margin: 0 auto;
            padding: 24px 0 10px;
        }

        .timeline::before {
            content: "";
            position: absolute;
            left: 50%;
            top: 0;
            bottom: 0;
            width: 2px;
            transform: translateX(-50%);
            background: #D3E0EE;
        }

        .tl-item {
            position: relative;
            width: 50%;
            padding-right: 58px;
            margin-bottom: 44px;
        }

        .tl-item:nth-child(even) {
            margin-left: 50%;
            padding-right: 0;
            padding-left: 58px;
        }

        .tl-card {
            background: #fff;
            border-radius: 22px;
            padding: 28px 30px;
            box-shadow: var(--shadow-card);
            transition: all .3s ease;
            border: 1px solid rgba(225, 233, 243, .8);
        }

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

        .tl-time {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 800;
            color: var(--primary-dark);
            background: #EAF1FE;
            padding: 5px 14px;
            border-radius: var(--radius-pill);
            margin-bottom: 16px;
        }

        .tl-time i {
            color: var(--accent);
        }

        .tl-card h3 {
            font-size: 21px;
            font-weight: 800;
            color: var(--text-deep);
            margin-bottom: 12px;
            line-height: 1.4;
        }

        .tl-card p {
            color: var(--text-weak);
            font-size: 15px;
            line-height: 1.75;
            margin-bottom: 14px;
        }

        .tl-meta {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            color: var(--text-weak);
            font-weight: 600;
        }

        .tl-meta i {
            color: var(--accent);
        }

        .tl-marker {
            position: absolute;
            right: -11px;
            top: 32px;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--primary);
            border: 4px solid #fff;
            box-shadow: 0 0 0 4px rgba(45, 111, 240, .18);
            z-index: 2;
        }

        .tl-item:nth-child(even) .tl-marker {
            left: -11px;
            right: auto;
        }

        @media (max-width: 768px) {
            .timeline {
                padding-left: 0;
                padding-right: 0;
            }

            .timeline::before {
                left: 12px;
                transform: none;
            }

            .tl-item,
            .tl-item:nth-child(even) {
                width: 100%;
                margin-left: 0;
                padding: 0 0 0 48px;
                margin-bottom: 28px;
            }

            .tl-marker,
            .tl-item:nth-child(even) .tl-marker {
                left: 3px;
                right: auto;
                top: 30px;
            }

            .tl-card {
                padding: 22px;
            }
        }

        /* ---------- Showcase / Highlights ---------- */
        .showcase-section {
            background: #fff;
            padding: var(--space-section) 0;
        }

        .showcase-inner {
            max-width: 1080px;
        }

        .showcase-item {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 58px;
            align-items: center;
            margin-bottom: 84px;
        }

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

        .showcase-item.flip .showcase-text {
            order: 2;
        }

        .showcase-item.flip .showcase-image {
            order: 1;
        }

        .showcase-image {
            position: relative;
            border-radius: 28px;
            overflow: hidden;
            box-shadow: var(--shadow-card);
        }

        .showcase-image img {
            width: 100%;
            height: 420px;
            object-fit: cover;
            transition: transform .6s ease;
        }

        .showcase-image:hover img {
            transform: scale(1.03);
        }

        .showcase-tag {
            position: absolute;
            left: 18px;
            top: 18px;
            z-index: 2;
        }

        .showcase-text .index-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 14px;
            background: #EAF1FE;
            color: var(--primary-dark);
            font-weight: 900;
            font-size: 18px;
            margin-bottom: 20px;
        }

        .showcase-text h3 {
            font-size: 29px;
            line-height: 1.4;
            font-weight: 800;
            color: var(--text-deep);
            margin-bottom: 16px;
        }

        .showcase-text p {
            color: var(--text-weak);
            font-size: 16px;
            line-height: 1.85;
            margin-bottom: 22px;
        }

        .showcase-list {
            margin-top: 12px;
        }

        .showcase-list li {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 10px;
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
        }

        .showcase-list li i {
            color: var(--accent);
            font-size: 14px;
            flex-shrink: 0;
        }

        @media (max-width: 860px) {
            .showcase-item,
            .showcase-item.flip {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .showcase-item.flip .showcase-text {
                order: 1;
            }

            .showcase-item.flip .showcase-image {
                order: 2;
            }

            .showcase-image img {
                height: 300px;
            }
        }

        @media (max-width: 520px) {
            .showcase-text h3 {
                font-size: 23px;
            }

            .showcase-image img {
                height: 220px;
            }
        }

        /* ---------- Plan / Level Section ---------- */
        .plan-section {
            background: var(--bg);
            padding: var(--space-section) 0;
        }

        .plan-row {
            max-width: 1120px;
            margin: 0 auto;
        }

        .plan-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 26px;
            align-items: stretch;
        }

        .plan-card {
            position: relative;
            display: flex;
            flex-direction: column;
            background: #fff;
            border: 1px solid rgba(225, 233, 243, .9);
            border-radius: 28px;
            padding: 38px 30px 34px;
            box-shadow: var(--shadow-card);
            transition: all .3s ease;
        }

        .plan-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }

        .plan-card .plan-name {
            display: block;
            font-size: 14px;
            font-weight: 800;
            color: var(--primary-dark);
            margin-bottom: 6px;
            text-transform: uppercase;
            letter-spacing: .5px;
        }

        .plan-card h3 {
            font-size: 26px;
            font-weight: 900;
            color: var(--text-deep);
            margin-bottom: 8px;
        }

        .plan-desc {
            font-size: 14px;
            line-height: 1.7;
            color: var(--text-weak);
            margin-bottom: 20px;
        }

        .plan-divider {
            height: 1px;
            background: var(--border);
            margin-bottom: 22px;
        }

        .plan-feature-list {
            flex: 1;
            margin-bottom: 28px;
        }

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

        .plan-feature-list li i {
            color: var(--accent);
            font-size: 15px;
            margin-top: 4px;
            flex-shrink: 0;
        }

        .plan-card .btn {
            width: 100%;
        }

        .plan-card.featured {
            background: #14409C;
            border-color: #14409C;
            padding: 46px 34px;
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(20, 64, 156, .22);
        }

        .plan-card.featured:hover {
            transform: translateY(-14px);
            box-shadow: 0 24px 48px rgba(20, 64, 156, .28);
        }

        .plan-card.featured .plan-name,
        .plan-card.featured h3,
        .plan-card.featured .plan-feature-list li {
            color: #fff;
        }

        .plan-card.featured .plan-desc {
            color: rgba(255, 255, 255, .78);
        }

        .plan-card.featured .plan-divider {
            background: rgba(255, 255, 255, .25);
        }

        .plan-card.featured .plan-feature-list li i {
            color: #75D6C5;
        }

        .plan-card .popular-badge {
            position: absolute;
            right: 24px;
            top: -12px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 7px 16px;
            border-radius: var(--radius-pill);
            background: var(--warm);
            color: #fff;
            font-size: 13px;
            font-weight: 800;
            box-shadow: 0 6px 16px rgba(242, 112, 89, .3);
        }

        @media (max-width: 860px) {
            .plan-list {
                grid-template-columns: 1fr;
                max-width: 560px;
                margin-left: auto;
                margin-right: auto;
            }

            .plan-card.featured {
                transform: none;
                padding: 40px 30px;
            }

            .plan-card.featured:hover {
                transform: translateY(-4px);
            }
        }

        /* ---------- Form / Signup ---------- */
        .signup-section {
            padding: var(--space-section) 0 40px;
        }

        .signup-panel {
            background: #fff;
            border-radius: 32px;
            box-shadow: var(--shadow-card);
            border: 1px solid rgba(225, 233, 243, .7);
            padding: 64px;
            max-width: 1100px;
            margin: 0 auto;
        }

        .signup-grid {
            display: grid;
            grid-template-columns: .9fr 1.1fr;
            gap: 48px;
            align-items: center;
        }

        .signup-copy h2 {
            font-size: 34px;
            font-weight: 900;
            color: var(--text-deep);
            line-height: 1.4;
            margin-bottom: 18px;
        }

        .signup-copy p {
            color: var(--text-weak);
            font-size: 16px;
            line-height: 1.85;
            margin-bottom: 20px;
        }

        .signup-note {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 14px 16px;
            border-radius: 16px;
            background: #F1F8F7;
            color: #0B7B6D;
            font-size: 14px;
            line-height: 1.7;
        }

        .signup-note i {
            font-size: 18px;
            margin-top: 2px;
        }

        .form-box {
            background: #F7FAFD;
            border-radius: 24px;
            padding: 28px;
            border: 1px solid var(--border);
        }

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

        .form-grid .full-col {
            grid-column: 1 / -1;
        }

        .field-label {
            display: block;
            font-size: 14px;
            font-weight: 700;
            color: #3B4C63;
            margin-bottom: 6px;
        }

        .form-control {
            width: 100%;
            height: 50px;
            border: 1px solid #D8E1EC;
            border-radius: 12px;
            background: #fff;
            padding: 0 16px;
            font-size: 15px;
            color: var(--text);
            transition: all .2s ease;
        }

        textarea.form-control {
            height: 100px;
            padding-top: 12px;
            resize: vertical;
        }

        select.form-control {
            appearance: auto;
        }

        .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(45, 111, 240, .14);
            outline: none;
            background: #fff;
        }

        .form-hint {
            margin-top: 10px;
            font-size: 13px;
            color: #8796AB;
            line-height: 1.6;
        }

        @media (max-width: 920px) {
            .signup-panel {
                padding: 34px 22px;
            }

            .signup-grid {
                grid-template-columns: 1fr;
                gap: 34px;
            }
        }

        @media (max-width: 560px) {
            .form-grid {
                grid-template-columns: 1fr;
            }

            .form-grid .full-col {
                grid-column: auto;
            }

            .signup-panel {
                border-radius: 22px;
                padding: 24px 18px;
            }

            .signup-copy h2 {
                font-size: 27px;
            }

            .form-box {
                padding: 20px;
            }
        }

        /* ---------- News / CMS Section ---------- */
        .news-section {
            background: #fff;
            padding: var(--space-section) 0;
        }

        .news-board {
            display: grid;
            grid-template-columns: 1.25fr 1fr;
            gap: 24px;
            background: var(--bg);
            border: 1px solid rgba(225, 233, 243, .9);
            border-radius: 30px;
            padding: 24px;
            box-shadow: var(--shadow-card);
        }

        .news-feature {
            display: flex;
            flex-direction: column;
            background: #fff;
            border-radius: 22px;
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: all .3s ease;
        }

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

        .feature-thumb {
            position: relative;
            height: 300px;
            overflow: hidden;
        }

        .feature-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .5s ease;
        }

        .news-feature:hover .feature-thumb img {
            transform: scale(1.04);
        }

        .feature-thumb .badge-tag {
            position: absolute;
            left: 16px;
            top: 16px;
            background: rgba(16, 168, 145, .9);
            color: #fff;
        }

        .feature-body {
            padding: 24px 26px 28px;
        }

        .feature-body .news-date {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-weak);
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 10px;
        }

        .feature-body .news-date i {
            color: var(--primary);
        }

        .feature-body h3 {
            font-size: 23px;
            line-height: 1.45;
            font-weight: 800;
            color: var(--text-deep);
            margin-bottom: 12px;
        }

        .feature-body p {
            color: var(--text-weak);
            font-size: 15px;
            line-height: 1.8;
        }

        .news-side-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .news-row {
            display: grid;
            grid-template-columns: 118px 1fr;
            gap: 16px;
            align-items: center;
            background: #fff;
            border-radius: 18px;
            padding: 12px;
            transition: all .3s ease;
            box-shadow: 0 2px 10px rgba(19, 52, 110, .04);
        }

        .news-row:hover {
            transform: translateX(4px);
            box-shadow: var(--shadow-card);
        }

        .row-thumb {
            width: 118px;
            height: 92px;
            border-radius: 14px;
            overflow: hidden;
        }

        .row-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .row-body h4 {
            font-size: 16px;
            font-weight: 800;
            color: var(--text-deep);
            line-height: 1.5;
            margin-bottom: 7px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            overflow: hidden;
            -webkit-box-orient: vertical;
        }

        .row-body .row-abstract {
            color: var(--text-weak);
            font-size: 13px;
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            overflow: hidden;
            -webkit-box-orient: vertical;
            margin-bottom: 8px;
        }

        .news-meta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 12px;
            font-weight: 600;
            color: #8796AB;
        }

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

        .no-post-tip {
            grid-column: 1 / -1;
            background: #F5F8FC;
            border: 1px dashed #C5D3E5;
            color: #6C7A91;
            padding: 34px 20px;
            border-radius: 18px;
            text-align: center;
            font-size: 15px;
        }

        .news-more-link {
            text-align: center;
            margin-top: 36px;
        }

        @media (max-width: 960px) {
            .news-board {
                grid-template-columns: 1fr;
            }

            .news-side-list {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 560px) {
            .news-board {
                padding: 14px;
                border-radius: 20px;
            }

            .feature-thumb {
                height: 200px;
            }

            .news-row {
                grid-template-columns: 84px 1fr;
                padding: 10px;
            }

            .row-thumb {
                width: 84px;
                height: 76px;
            }

            .row-body h4 {
                font-size: 14px;
            }

            .row-abstract {
                display: none;
            }
        }

        /* ---------- Metrics Band ---------- */
        .metrics-section {
            background: var(--bg);
            padding: 60px 0;
        }

        .metrics-card {
            background: #fff;
            border-radius: 30px;
            border: 1px solid rgba(225, 233, 243, .9);
            box-shadow: var(--shadow-card);
            padding: 40px 30px;
        }

        .metrics-list {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
            text-align: center;
        }

        .metrics-list li {
            flex: 1 1 180px;
        }

        .metrics-list strong {
            display: block;
            font-size: 32px;
            font-weight: 900;
            color: var(--primary-dark);
            line-height: 1.2;
            margin-bottom: 4px;
        }

        .metrics-list span {
            color: var(--text-weak);
            font-size: 14px;
            font-weight: 600;
        }

        @media (max-width: 520px) {
            .metrics-list {
                gap: 24px;
            }

            .metrics-list strong {
                font-size: 26px;
            }
        }

        /* ---------- FAQ ---------- */
        .faq-section {
            background: #fff;
            padding: var(--space-section) 0;
        }

        .faq-list {
            max-width: 840px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--bg);
            border: 1px solid rgba(225, 233, 243, .9);
            border-radius: 20px;
            margin-bottom: 16px;
            overflow: hidden;
            transition: all .25s ease;
        }

        .faq-item[open] {
            background: #EEF4FD;
            box-shadow: none;
        }

        .faq-summary {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 22px 26px;
            cursor: pointer;
            font-size: 17px;
            font-weight: 800;
            color: var(--text-deep);
            list-style: none;
            position: relative;
        }

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

        .faq-summary::before {
            content: "Q";
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 28px;
            height: 28px;
            border-radius: 9px;
            background: var(--primary);
            color: #fff;
            font-size: 14px;
            font-weight: 900;
            flex-shrink: 0;
        }

        .faq-summary::after {
            content: "\f078";
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            margin-left: auto;
            color: var(--primary);
            font-size: 14px;
            transition: transform .25s ease;
        }

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

        .faq-body {
            padding: 0 26px 22px 70px;
            color: #4B5C75;
            font-size: 15px;
            line-height: 1.85;
        }

        @media (max-width: 520px) {
            .faq-summary {
                padding: 18px;
                font-size: 15px;
            }

            .faq-body {
                padding: 0 18px 20px 54px;
            }
        }

        /* ---------- CTA ---------- */
        .cta-section {
            background: var(--bg);
            padding: var(--space-section) 0;
        }

        .cta-card {
            background: #fff;
            border-radius: 34px;
            border: 1px solid rgba(225, 233, 243, .9);
            box-shadow: var(--shadow-card);
            text-align: center;
            padding: 76px 40px;
            position: relative;
            overflow: hidden;
        }

        .cta-card .cta-icon {
            width: 72px;
            height: 72px;
            margin: 0 auto 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 22px;
            background: #E9F1FE;
            color: var(--primary-dark);
            font-size: 28px;
        }

        .cta-card h2 {
            font-size: 34px;
            font-weight: 900;
            line-height: 1.4;
            color: var(--text-deep);
            max-width: 680px;
            margin: 0 auto 16px;
        }

        .cta-card p {
            color: var(--text-weak);
            max-width: 580px;
            margin: 0 auto 30px;
        }

        .cta-buttons {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 14px;
        }

        @media (max-width: 560px) {
            .cta-card {
                padding: 48px 24px;
                border-radius: 22px;
            }

            .cta-card h2 {
                font-size: 26px;
            }

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

        /* ---------- Footer ---------- */
        .site-footer {
            margin-top: 60px;
            background: #fff;
            border-top: 1px solid var(--border);
            padding: 80px 0 28px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr .8fr 1fr 1.2fr;
            gap: 44px;
            padding-bottom: 50px;
        }

        .footer-brand {
            font-size: 22px;
            font-weight: 900;
            color: var(--text-deep);
            margin-bottom: 14px;
        }

        .footer-brand span {
            color: var(--primary);
        }

        .footer-about {
            font-size: 15px;
            line-height: 1.85;
            color: var(--text-weak);
            max-width: 280px;
            margin-bottom: 18px;
        }

        .footer-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .footer-tags a {
            display: inline-flex;
            padding: 6px 12px;
            background: #EEF3FB;
            color: #4B5C75;
            border-radius: var(--radius-pill);
            font-size: 13px;
            font-weight: 600;
        }

        .footer-tags a:hover {
            background: #DCE8FA;
            color: var(--primary-dark);
        }

        .footer-title {
            font-size: 16px;
            font-weight: 800;
            color: var(--text-deep);
            margin-bottom: 18px;
        }

        .footer-list a {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--text-weak);
            font-size: 15px;
            padding: 6px 0;
        }

        .footer-list a:hover {
            color: var(--primary-dark);
            transform: translateX(3px);
        }

        .footer-list a i {
            font-size: 12px;
            color: var(--accent);
        }

        .footer-contact li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            color: var(--text-weak);
            font-size: 15px;
            margin-bottom: 12px;
        }

        .footer-contact li i {
            color: var(--primary);
            font-size: 16px;
            margin-top: 6px;
            width: 18px;
            text-align: center;
        }

        .footer-bottom {
            border-top: 1px solid #EEF2F8;
            padding-top: 24px;
            text-align: center;
            font-size: 14px;
            color: #8A97A8;
        }

        .footer-bottom a {
            color: #6C7A91;
            font-weight: 600;
        }

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

        @media (max-width: 900px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 40px 28px;
            }
        }

        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }

            .site-footer {
                padding-top: 52px;
            }
        }

        @media (max-width: 480px) {
            .section-head h2 {
                font-size: 27px;
            }

            .section-pad {
                padding-top: 70px;
                padding-bottom: 70px;
            }
        }

/* roulang page: category1 */
:root{
            --primary:#2D6FF0;
            --primary-dark:#1E4FC4;
            --primary-soft:rgba(45,111,240,.09);
            --accent:#10A891;
            --accent-dark:#0B8774;
            --coral:#F27059;
            --bg:#F5F8FC;
            --surface:#FFFFFF;
            --border:#E1E9F3;
            --heading:#1D2B45;
            --text:#3E5068;
            --muted:#6B7C96;
            --radius-xl:32px;
            --radius-lg:24px;
            --radius-md:16px;
            --radius-sm:10px;
            --shadow-sm:0 6px 24px rgba(19,52,110,.06);
            --shadow-md:0 14px 34px rgba(19,52,110,.08);
            --shadow-lg:0 20px 50px rgba(19,52,110,.12);
            --ease:cubic-bezier(.25,.46,.45,.94);
        }
        *{box-sizing:border-box}
        html{scroll-behavior:smooth;scroll-padding-top:130px}
        body{
            margin:0;
            color:var(--text);
            font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC","Helvetica Neue",Arial,sans-serif;
            font-size:17px;
            line-height:1.8;
            background:var(--bg);
            -webkit-font-smoothing:antialiased;
        }
        body, h1, h2, h3, h4, p, ul, ol, figure, blockquote, dl, dd{margin:0}
        ul,ol{padding:0}
        ul,ol{list-style:none}
        img{max-width:100%;display:block}
        a{color:inherit;text-decoration:none;transition:color .25s var(--ease),background-color .25s var(--ease),border-color .25s var(--ease),box-shadow .25s var(--ease),transform .25s var(--ease)}
        button{font-family:inherit;cursor:pointer;border:0;background:none}
        input,select,textarea{
            font-family:inherit;
            font-size:16px;
            outline:none;
            border:1px solid var(--border);
            border-radius:var(--radius-sm);
            background:var(--surface);
            padding:12px 16px;
            width:100%;
            color:var(--heading);
            transition:border-color .2s,box-shadow .2s;
        }
        input:focus,select:focus,textarea:focus{
            border-color:var(--primary);
            box-shadow:0 0 0 3px rgba(45,111,240,.12);
        }
        ::placeholder{color:#9AA9BD}
        :focus-visible{outline:3px solid rgba(45,111,240,.35);outline-offset:2px;border-radius:4px}
        .grid-container{max-width:1200px}
        .section{padding:96px 0}
        .section-head{
            max-width:820px;
            margin:0 auto 54px;
            text-align:center;
        }
        .eyebrow{
            display:inline-flex;
            align-items:center;
            gap:8px;
            font-size:14px;
            font-weight:600;
            letter-spacing:1.6px;
            color:var(--accent);
            background:rgba(16,168,145,.08);
            padding:7px 16px;
            border-radius:999px;
            text-transform:uppercase;
        }
        .section-title{
            font-size:34px;
            color:var(--heading);
            line-height:1.35;
            font-weight:700;
            margin:14px 0 16px;
        }
        .section-sub{
            font-size:18px;
            color:var(--muted);
            line-height:1.8;
        }
        .site-header{
            position:fixed;
            top:16px;
            left:0;
            right:0;
            z-index:90;
            padding:0 20px;
            pointer-events:none;
        }
        .header-shell{
            position:relative;
            max-width:1180px;
            margin:0 auto;
            height:72px;
            padding:0 18px 0 22px;
            display:flex;
            align-items:center;
            justify-content:space-between;
            background:rgba(255,255,255,.88);
            backdrop-filter:blur(14px);
            -webkit-backdrop-filter:blur(14px);
            border:1px solid rgba(225,233,243,.85);
            border-radius:999px;
            box-shadow:0 10px 36px rgba(19,52,110,.1);
            pointer-events:auto;
        }
        .brand{
            display:flex;
            align-items:center;
            gap:12px;
            flex-shrink:0;
        }
        .brand-mark{
            width:42px;
            height:42px;
            border-radius:13px;
            display:flex;
            align-items:center;
            justify-content:center;
            background:var(--primary);
            color:#fff;
            font-size:17px;
            font-weight:800;
            letter-spacing:.5px;
            box-shadow:0 8px 20px rgba(45,111,240,.25);
        }
        .brand-cn{
            font-size:19px;
            font-weight:700;
            color:var(--heading);
            line-height:1.25;
            letter-spacing:1px;
        }
        .brand-cn small{
            display:block;
            font-size:11px;
            font-weight:600;
            color:var(--primary-dark);
            letter-spacing:1.8px;
            line-height:1.2;
        }
        .main-nav{
            display:flex;
            align-items:center;
            justify-content:center;
            gap:4px;
            flex:1;
            padding:0 12px;
        }
        .main-nav a{
            display:inline-flex;
            align-items:center;
            justify-content:center;
            padding:9px 16px;
            border-radius:999px;
            font-size:16px;
            font-weight:600;
            color:var(--text);
            white-space:nowrap;
        }
        .main-nav a:hover{
            color:var(--primary);
            background:var(--primary-soft);
        }
        .main-nav a.active{
            color:var(--primary-dark);
            background:rgba(45,111,240,.1);
        }
        .header-actions{
            display:flex;
            align-items:center;
            gap:12px;
            flex-shrink:0;
        }
        .btn{
            display:inline-flex;
            align-items:center;
            justify-content:center;
            gap:8px;
            border:1px solid transparent;
            border-radius:999px;
            font-size:16px;
            font-weight:600;
            line-height:1.2;
            padding:12px 26px;
            background:transparent;
            color:var(--heading);
            transition:background-color .25s var(--ease),color .25s var(--ease),box-shadow .25s var(--ease),transform .2s var(--ease),border-color .25s var(--ease);
        }
        .btn-primary{
            background:var(--primary);
            color:#fff;
            box-shadow:0 10px 24px rgba(45,111,240,.22);
        }
        .btn-primary:hover{
            background:var(--primary-dark);
            color:#fff;
            transform:translateY(-2px);
            box-shadow:0 14px 30px rgba(30,79,196,.26);
        }
        .btn-primary:active{
            transform:translateY(0);
            box-shadow:0 6px 16px rgba(45,111,240,.2);
        }
        .btn-ghost{
            background:rgba(255,255,255,.14);
            color:#fff;
            border-color:rgba(255,255,255,.6);
        }
        .btn-ghost:hover{
            background:rgba(255,255,255,.26);
            color:#fff;
            transform:translateY(-2px);
        }
        .nav-btn{font-size:15px;padding:10px 20px;border-radius:999px}
        .nav-toggle{
            width:42px;
            height:42px;
            border-radius:50%;
            background:var(--primary-soft);
            color:var(--primary-dark);
            display:none;
            align-items:center;
            justify-content:center;
            font-size:18px;
        }
        .page-hero{
            position:relative;
            padding:170px 0 112px;
            color:#fff;
            background-color:rgba(32,74,155,.78);
            background-image:url("/assets/images/backpic/back-2.png");
            background-size:cover;
            background-position:center;
            background-blend-mode:multiply;
        }
        .page-hero::after{
            content:"";
            position:absolute;
            inset:0;
            background:linear-gradient(110deg,rgba(21,54,119,.42),rgba(23,62,126,.18));
            pointer-events:none;
        }
        .page-hero .grid-container{
            position:relative;
            z-index:1;
        }
        .breadcrumb{
            display:flex;
            align-items:center;
            gap:10px;
            font-size:15px;
            color:rgba(255,255,255,.9);
            margin-bottom:22px;
        }
        .breadcrumb a{color:rgba(255,255,255,.86)}
        .breadcrumb a:hover{color:#fff}
        .breadcrumb-sep{opacity:.55}
        .hero-title{
            font-size:50px;
            line-height:1.2;
            font-weight:700;
            color:#fff;
            font-style:normal;
            letter-spacing:1px;
            max-width:760px;
        }
        .hero-sub{
            font-size:20px;
            line-height:1.75;
            color:rgba(255,255,255,.95);
            max-width:690px;
            margin-top:18px;
        }
        .hero-actions{
            display:flex;
            align-items:center;
            flex-wrap:wrap;
            gap:16px;
            margin-top:34px;
        }
        .hero-note{
            display:inline-flex;
            align-items:center;
            gap:8px;
            font-size:15px;
            color:rgba(255,255,255,.8);
        }
        .hero-note i{color:var(--coral)}
        .hero-badges{
            display:flex;
            flex-wrap:wrap;
            gap:10px;
            margin-top:30px;
        }
        .hero-badge{
            display:inline-flex;
            align-items:center;
            gap:8px;
            background:rgba(255,255,255,.16);
            border:1px solid rgba(255,255,255,.24);
            border-radius:999px;
            padding:6px 14px;
            font-size:14px;
            color:#fff;
        }
        .hero-badge i{color:#FFD5B8;font-size:13px}
        .category-brief{
            background:var(--bg);
            padding-bottom:70px;
        }
        .brief-head{
            max-width:820px;
            margin:0 auto 54px;
            text-align:center;
        }
        .brief-title{
            font-size:34px;
            line-height:1.35;
            font-weight:700;
            color:var(--heading);
            margin:14px 0 16px;
        }
        .brief-sub{
            font-size:18px;
            color:var(--muted);
        }
        .brief-visual{
            border-radius:var(--radius-xl);
            overflow:hidden;
            box-shadow:var(--shadow-lg);
            position:relative;
            min-height:420px;
        }
        .brief-visual img{
            width:100%;
            height:100%;
            object-fit:cover;
            min-height:420px;
        }
        .brief-visual-caption{
            position:absolute;
            left:20px;
            bottom:20px;
            background:rgba(255,255,255,.9);
            color:var(--heading);
            padding:10px 18px;
            border-radius:999px;
            font-size:15px;
            font-weight:600;
            display:inline-flex;
            align-items:center;
            gap:8px;
            backdrop-filter:blur(6px);
            box-shadow:0 8px 20px rgba(19,52,110,.14);
        }
        .brief-visual-caption i{color:var(--accent)}
        .brief-content{padding-left:44px}
        .brief-content-kicker{
            display:inline-flex;
            align-items:center;
            gap:8px;
            color:var(--accent);
            font-size:15px;
            font-weight:600;
            margin-bottom:12px;
        }
        .brief-content h3{
            font-size:26px;
            color:var(--heading);
            font-weight:700;
            line-height:1.4;
            margin-bottom:14px;
        }
        .brief-content p{
            color:var(--text);
            line-height:1.85;
            margin-bottom:20px;
        }
        .brief-points{
            display:grid;
            gap:12px;
            margin-top:18px;
        }
        .brief-points li{
            display:flex;
            align-items:flex-start;
            gap:12px;
            background:var(--surface);
            border:1px solid var(--border);
            border-radius:var(--radius-md);
            padding:13px 16px;
            box-shadow:var(--shadow-sm);
        }
        .brief-points i{
            color:var(--accent);
            margin-top:5px;
            font-size:14px;
        }
        .feature-highlight{
            background:var(--surface);
            padding:100px 0 90px;
            border-radius:56px 56px 0 0;
            box-shadow:0 -20px 60px rgba(19,52,110,.04);
        }
        .feature-item{
            margin-bottom:86px;
        }
        .feature-item:last-child{margin-bottom:8px}
        .feature-media{
            position:relative;
            border-radius:var(--radius-xl);
            overflow:hidden;
            box-shadow:var(--shadow-md);
            min-height:380px;
        }
        .feature-media img{
            width:100%;
            height:100%;
            min-height:380px;
            object-fit:cover;
            transition:transform .6s var(--ease);
        }
        .feature-item:hover .feature-media img{
            transform:scale(1.02);
        }
        .feature-content{
            padding-left:40px;
        }
        .feature-reverse .feature-content{
            padding-left:0;
            padding-right:40px;
        }
        .guide-tag{
            display:inline-flex;
            align-items:center;
            gap:8px;
            background:var(--primary-soft);
            color:var(--primary-dark);
            font-size:14px;
            font-weight:600;
            padding:6px 14px;
            border-radius:999px;
            margin-bottom:16px;
        }
        .guide-tag.accent{
            background:rgba(16,168,145,.09);
            color:var(--accent-dark);
        }
        .feature-content h3{
            font-size:28px;
            line-height:1.35;
            color:var(--heading);
            font-weight:700;
            margin-bottom:16px;
        }
        .feature-content p{
            color:var(--text);
            margin-bottom:16px;
        }
        .feature-list{
            display:grid;
            gap:10px;
            margin-bottom:24px;
        }
        .feature-list li{
            display:flex;
            align-items:flex-start;
            gap:10px;
            line-height:1.6;
        }
        .feature-list i{
            width:20px;
            height:20px;
            border-radius:50%;
            background:rgba(16,168,145,.12);
            color:var(--accent);
            font-size:11px;
            display:inline-flex;
            align-items:center;
            justify-content:center;
            margin-top:6px;
        }
        .link-btn{
            display:inline-flex;
            align-items:center;
            gap:8px;
            color:var(--primary-dark);
            font-weight:600;
            font-size:16px;
        }
        .link-btn i{transition:transform .25s var(--ease)}
        .link-btn:hover i{transform:translateX(4px)}
        .scenario-section{
            background:var(--bg);
            padding:96px 0 96px;
        }
        .scenario-grid{
            display:grid;
            grid-template-columns:1fr 1fr;
            gap:28px;
        }
        .scenario-card{
            position:relative;
            min-height:300px;
            border-radius:var(--radius-xl);
            overflow:hidden;
            display:flex;
            flex-direction:column;
            align-items:flex-start;
            justify-content:flex-end;
            padding:30px;
            color:#fff;
            box-shadow:var(--shadow-md);
            isolation:isolate;
        }
        .scenario-card::after{
            content:"";
            position:absolute;
            inset:0;
            z-index:-1;
            background:linear-gradient(180deg,rgba(22,40,72,.05) 20%,rgba(15,33,62,.62) 72%,rgba(9,25,49,.82) 100%);
            transition:background .3s;
        }
        .scenario-bg{
            position:absolute;
            inset:0;
            z-index:-2;
            width:100%;
            height:100%;
            object-fit:cover;
            transition:transform .6s var(--ease);
        }
        .scenario-card:hover .scenario-bg{
            transform:scale(1.04);
        }
        .scenario-tag{
            display:inline-flex;
            align-items:center;
            gap:7px;
            background:rgba(255,255,255,.18);
            border:1px solid rgba(255,255,255,.3);
            border-radius:999px;
            font-size:13px;
            font-weight:600;
            padding:5px 12px;
            backdrop-filter:blur(8px);
        }
        .scenario-card h3{
            font-size:22px;
            font-weight:700;
            line-height:1.4;
            margin:14px 0 10px;
            color:#fff;
        }
        .scenario-card p{
            font-size:15px;
            color:rgba(255,255,255,.88);
            max-width:460px;
            line-height:1.7;
        }
        .scenario-more{
            display:inline-flex;
            align-items:center;
            gap:8px;
            font-size:15px;
            font-weight:600;
            margin-top:16px;
            color:#fff;
            border-bottom:1px solid rgba(255,255,255,.4);
            padding-bottom:2px;
        }
        .scenario-more i{transition:transform .25s}
        .scenario-card:hover .scenario-more i{transform:translateX(4px)}
        .flow-section{
            background:var(--surface);
            padding:100px 0;
        }
        .flow-panel{
            max-width:940px;
            margin:0 auto;
        }
        .flow-row{
            display:grid;
            grid-template-columns:64px 1fr;
            gap:22px;
            position:relative;
            padding-bottom:46px;
        }
        .flow-row:last-child{padding-bottom:0}
        .flow-row::before{
            content:"";
            position:absolute;
            left:31px;
            top:80px;
            bottom:0;
            width:2px;
            background:var(--border);
        }
        .flow-row:last-child::before{display:none}
        .flow-num{
            width:64px;
            height:64px;
            border-radius:50%;
            background:var(--surface);
            border:2px solid var(--primary);
            color:var(--primary);
            display:flex;
            align-items:center;
            justify-content:center;
            font-size:22px;
            font-weight:700;
            box-shadow:0 0 0 8px rgba(45,111,240,.06);
            z-index:1;
        }
        .flow-row:nth-child(2) .flow-num{border-color:var(--accent);color:var(--accent);box-shadow:0 0 0 8px rgba(16,168,145,.06)}
        .flow-row:nth-child(3) .flow-num{border-color:#B99023;color:#A67A14;box-shadow:0 0 0 8px rgba(208,174,53,.1)}
        .flow-row:nth-child(4) .flow-num{border-color:var(--coral);color:var(--coral);box-shadow:0 0 0 8px rgba(242,112,89,.08)}
        .flow-body{
            background:var(--bg);
            border:1px solid var(--border);
            border-radius:var(--radius-lg);
            padding:24px 26px;
            box-shadow:var(--shadow-sm);
        }
        .flow-body h3{
            font-size:20px;
            color:var(--heading);
            font-weight:700;
            margin-bottom:8px;
        }
        .flow-body p{
            color:var(--muted);
            font-size:16px;
            line-height:1.75;
        }
        .faq-section{
            background:var(--bg);
            padding:100px 0;
        }
        .faq-container{
            max-width:860px;
            margin:0 auto;
        }
        .faq-item{
            background:var(--surface);
            border:1px solid var(--border);
            border-radius:var(--radius-md);
            box-shadow:var(--shadow-sm);
            margin-bottom:14px;
            overflow:hidden;
            transition:background-color .25s,border-color .25s,box-shadow .25s;
        }
        .faq-item[open]{
            background:#EEF4FD;
            border-color:rgba(45,111,240,.18);
            box-shadow:0 8px 24px rgba(45,111,240,.08);
        }
        .faq-item summary{
            cursor:pointer;
            list-style:none;
            display:flex;
            align-items:center;
            gap:14px;
            padding:20px 22px;
            font-weight:600;
            font-size:17px;
            color:var(--heading);
            line-height:1.5;
        }
        .faq-item summary::-webkit-details-marker{display:none}
        .faq-mark{
            flex-shrink:0;
            width:30px;
            height:30px;
            border-radius:10px;
            background:var(--primary-soft);
            color:var(--primary);
            display:inline-flex;
            align-items:center;
            justify-content:center;
            font-size:15px;
        }
        .faq-expand{
            margin-left:auto;
            color:var(--primary);
            display:inline-flex;
            align-items:center;
            justify-content:center;
            flex-shrink:0;
        }
        .faq-expand .fa-minus{display:none}
        .faq-item[open] .faq-expand .fa-plus{display:none}
        .faq-item[open] .faq-expand .fa-minus{display:inline}
        .faq-body{
            padding:0 22px 22px 66px;
            color:var(--text);
            font-size:16px;
            line-height:1.8;
        }
        .faq-body p{margin-bottom:8px}
        .signup-section{
            background:var(--surface);
            padding:100px 0;
        }
        .signup-panel{
            background:var(--bg);
            border:1px solid var(--border);
            border-radius:var(--radius-xl);
            box-shadow:var(--shadow-md);
            padding:54px;
            display:grid;
            grid-template-columns:1fr 1.15fr;
            gap:54px;
        }
        .signup-copy .eyebrow{margin-bottom:14px}
        .signup-copy h2{
            font-size:32px;
            line-height:1.35;
            color:var(--heading);
            font-weight:700;
            margin-bottom:16px;
        }
        .signup-copy p{
            color:var(--text);
            margin-bottom:20px;
        }
        .signup-list{
            display:grid;
            gap:12px;
        }
        .signup-list li{
            display:flex;
            gap:12px;
            align-items:flex-start;
            color:var(--text);
            font-size:16px;
        }
        .signup-list i{
            width:22px;
            height:22px;
            border-radius:50%;
            background:rgba(16,168,145,.12);
            color:var(--accent);
            display:inline-flex;
            align-items:center;
            justify-content:center;
            font-size:11px;
            margin-top:5px;
        }
        .form-card{
            background:var(--surface);
            border-radius:var(--radius-lg);
            border:1px solid var(--border);
            box-shadow:var(--shadow-md);
            padding:28px;
        }
        .form-title{
            font-size:20px;
            font-weight:700;
            color:var(--heading);
            margin-bottom:18px;
        }
        .form-grid{
            display:grid;
            grid-template-columns:1fr 1fr;
            gap:16px;
        }
        .field{
            display:flex;
            flex-direction:column;
            gap:7px;
            font-size:14px;
            font-weight:600;
            color:var(--heading);
        }
        .field.full{grid-column:1/-1}
        .field label{
            font-size:14px;
            color:var(--heading);
            font-weight:600;
        }
        .field textarea{min-height:96px;resize:vertical}
        .submit-line{
            grid-column:1/-1;
            display:flex;
            align-items:center;
            justify-content:space-between;
            gap:16px;
            flex-wrap:wrap;
            margin-top:6px;
        }
        .form-tip{
            font-size:14px;
            color:var(--muted);
        }
        .site-footer{
            background:var(--bg);
            border-top:1px solid var(--border);
            padding:78px 0 30px;
            font-size:16px;
        }
        .footer-grid{
            display:grid;
            grid-template-columns:1.35fr .9fr .9fr 1.1fr;
            gap:36px;
            padding-bottom:50px;
            border-bottom:1px solid var(--border);
        }
        .footer-brand{
            font-size:22px;
            font-weight:700;
            color:var(--heading);
            margin-bottom:14px;
        }
        .footer-brand span{
            display:block;
            font-size:13px;
            color:var(--primary-dark);
            letter-spacing:2px;
            margin-top:2px;
        }
        .footer-about{
            color:var(--muted);
            font-size:15px;
            line-height:1.8;
            max-width:320px;
        }
        .footer-tags{
            display:flex;
            flex-wrap:wrap;
            gap:8px;
            margin-top:18px;
        }
        .footer-tags a{
            font-size:14px;
            color:var(--primary-dark);
            background:var(--primary-soft);
            border-radius:999px;
            padding:3px 12px;
            border:1px solid transparent;
        }
        .footer-tags a:hover{
            border-color:rgba(45,111,240,.2);
            background:var(--surface);
        }
        .footer-title{
            font-size:16px;
            color:var(--heading);
            font-weight:700;
            margin-bottom:14px;
        }
        .footer-list{
            display:grid;
            gap:9px;
        }
        .footer-list a{
            color:var(--muted);
            font-size:15px;
        }
        .footer-list a i{
            font-size:11px;
            color:var(--primary);
            margin-right:4px;
        }
        .footer-list a:hover{color:var(--primary-dark)}
        .footer-contact{
            display:grid;
            gap:12px;
            color:var(--muted);
            font-size:15px;
            line-height:1.7;
        }
        .footer-contact i{
            width:16px;
            color:var(--primary);
            margin-right:4px;
        }
        .footer-bottom{
            text-align:center;
            padding-top:30px;
            color:var(--muted);
            font-size:14px;
        }
        @media (max-width:1023.98px){
            .header-shell{
                height:auto;
                min-height:68px;
                flex-wrap:wrap;
                padding:10px 14px;
                border-radius:32px;
                transition:border-radius .3s;
            }
            .main-nav{
                display:none;
                order:3;
                width:100%;
                flex-direction:column;
                align-items:stretch;
                gap:4px;
                padding:12px 8px 0;
            }
            .nav-open .main-nav{display:flex}
            .main-nav a{
                justify-content:flex-start;
                padding:12px 16px;
                border-radius:16px;
            }
            .nav-toggle{display:inline-flex}
            .nav-btn{display:none}
            .hero-title{font-size:40px}
            .feature-content,.feature-reverse .feature-content{padding-left:0;padding-right:0;margin-top:30px}
            .signup-panel{
                grid-template-columns:1fr;
                padding:36px;
                gap:36px;
            }
            .footer-grid{
                grid-template-columns:1fr 1fr;
            }
            .brief-content{padding-left:0;padding-top:36px}
            .flow-row{gap:16px}
        }
        @media (max-width:767.98px){
            .section{padding:68px 0}
            .page-hero{padding:140px 0 80px}
            .hero-title{font-size:34px}
            .hero-sub{font-size:18px}
            .hero-actions .btn{width:100%}
            .section-title{font-size:27px}
            .brief-title{font-size:27px}
            .brief-visual,.brief-visual img{min-height:300px}
            .feature-item{margin-bottom:54px}
            .feature-media,.feature-media img{min-height:300px}
            .feature-content h3{font-size:23px}
            .scenario-grid{grid-template-columns:1fr}
            .scenario-card{min-height:248px}
            .flow-panel .section-head{text-align:left}
            .flow-row{grid-template-columns:44px 1fr}
            .flow-num{width:44px;height:44px;font-size:18px}
            .flow-row::before{left:21px;top:64px}
            .flow-body{padding:18px}
            .faq-section,.signup-section,.flow-section{padding:68px 0}
            .faq-body{padding:0 18px 18px 60px}
            .signup-form .form-grid{grid-template-columns:1fr}
            .form-grid .field,.form-grid .submit-line{grid-column:1/-1}
            .signup-panel{padding:26px}
            .footer-grid{grid-template-columns:1fr;gap:26px}
            .footer-bottom{text-align:center}
        }
        @media (max-width:520px){
            .header-shell{padding:10px 12px;border-radius:24px}
            .brand-mark{width:38px;height:38px}
            .brand-cn{font-size:17px}
            .page-hero{padding:128px 0 68px}
            .breadcrumb{font-size:13px;gap:6px}
            .hero-title{font-size:29px}
            .hero-sub{font-size:16px}
            .hero-badge{font-size:13px}
            .form-card{padding:20px}
            .submit-line{flex-direction:column;align-items:stretch}
            .footer-tags a{white-space:nowrap}
        }

/* roulang page: article */
:root{
    --brand: #2D6FF0;
    --brand-dark: #1E4FC4;
    --accent: #10A891;
    --warm: #F27059;
    --bg: #F5F8FC;
    --card: #FFFFFF;
    --line: #E1E9F3;
    --text: #182C40;
    --text-deep: #12243A;
    --muted: #6E7F96;
    --radius-lg: 22px;
    --radius-md: 14px;
    --radius-pill: 999px;
    --shadow-sm: 0 6px 24px rgba(19,52,110,0.06);
    --shadow-md: 0 14px 36px rgba(19,52,110,0.10);
    --maxw: 1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
    font-family:"PingFang SC","Microsoft YaHei","Source Han Sans SC","Helvetica Neue",Arial,sans-serif;
    font-size:17px;
    line-height:1.8;
    color:var(--text);
    background:var(--bg);
    padding-top:112px;
    -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
ul,ol{list-style:none}
a{text-decoration:none;color:inherit;transition:color .2s ease,background .2s ease,border-color .2s ease,box-shadow .2s ease,transform .2s ease}
button{font-family:inherit}
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid rgba(45,111,240,.35);outline-offset:2px}
.container{max-width:var(--maxw);margin:0 auto;padding-left:22px;padding-right:22px}
.grid-container{max-width:var(--maxw)!important}
.site-header{
    position:fixed;
    top:16px;
    left:0;
    right:0;
    z-index:120;
    padding:0 18px;
}
.header-shell{
    position:relative;
    max-width:1180px;
    margin:0 auto;
    height:70px;
    background:rgba(255,255,255,.88);
    backdrop-filter:blur(16px);
    -webkit-backdrop-filter:blur(16px);
    border:1px solid rgba(225,233,243,.82);
    border-radius:var(--radius-pill);
    box-shadow:0 10px 30px rgba(19,52,110,.08);
    display:flex;
    align-items:center;
    gap:28px;
    padding:0 26px;
}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;color:var(--text-deep)}
.brand-mark{
    width:40px;height:40px;
    background:linear-gradient(145deg,var(--brand),var(--brand-dark));
    color:#fff;font-size:15px;font-weight:800;
    border-radius:13px;
    display:flex;align-items:center;justify-content:center;
    letter-spacing:-.5px;
    box-shadow:0 6px 14px rgba(45,111,240,.22);
}
.brand-cn{font-size:19px;font-weight:700;line-height:1.15}
.brand-cn small{display:block;font-size:11px;color:var(--muted);font-weight:500;letter-spacing:1px;line-height:1.3}
.main-nav{display:flex;align-items:center;gap:2px;margin-left:auto}
.main-nav a{
    padding:10px 17px;
    border-radius:var(--radius-pill);
    color:var(--text);
    font-size:15px;
    font-weight:600;
    white-space:nowrap;
}
.main-nav a:hover{background:#EEF4FD;color:var(--brand-dark)}
.main-nav a.active{background:#EAF1FF;color:var(--brand-dark);box-shadow:inset 0 0 0 1px rgba(45,111,240,.12)}
.header-actions{display:flex;align-items:center;gap:12px;margin-left:4px}
.btn{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:8px;
    border-radius:var(--radius-pill);
    font-weight:700;
    line-height:1;
    border:1px solid transparent;
    cursor:pointer;
    transition:all .2s ease;
}
.btn-primary{
    color:#fff;
    background:var(--brand);
    padding:12px 24px;
    font-size:15px;
    box-shadow:0 8px 20px rgba(45,111,240,.18);
}
.btn-primary:hover{background:var(--brand-dark);transform:translateY(-2px);box-shadow:0 12px 24px rgba(30,79,196,.22);color:#fff}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{
    color:#fff;
    background:rgba(255,255,255,.14);
    border-color:rgba(255,255,255,.42);
    padding:12px 22px;
    font-size:15px;
}
.btn-ghost:hover{background:rgba(255,255,255,.22);color:#fff}
.nav-toggle{
    display:none;
    width:42px;height:42px;
    align-items:center;
    justify-content:center;
    border:none;
    background:#E9F1FE;
    color:var(--brand-dark);
    border-radius:14px;
    font-size:18px;
    cursor:pointer;
}
.article-hero{
    position:relative;
    background:linear-gradient(rgba(19,39,72,.78),rgba(30,79,196,.62)),url('/assets/images/backpic/back-3.webp') center/cover no-repeat;
    color:#fff;
    padding:82px 0 70px;
    min-height:320px;
    display:flex;
    align-items:center;
}
.article-hero-inner{position:relative;z-index:2;max-width:980px;margin:0 auto;padding:0 22px;width:100%}
.breadcrumb{
    display:flex;
    flex-wrap:wrap;
    align-items:center;
    gap:10px;
    font-size:14px;
    color:rgba(255,255,255,.84);
    margin-bottom:22px;
    line-height:1.4;
}
.breadcrumb a{color:rgba(255,255,255,.9)}
.breadcrumb a:hover{color:#fff;text-decoration:underline;text-underline-offset:4px}
.breadcrumb .crumb-current{color:#fff;opacity:.95}
.breadcrumb .sep{opacity:.7}
.article-hero-labels{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:18px}
.hero-chip{
    display:inline-flex;
    align-items:center;
    gap:7px;
    background:rgba(255,255,255,.15);
    border:1px solid rgba(255,255,255,.30);
    border-radius:var(--radius-pill);
    color:#fff;
    padding:7px 15px;
    font-size:13px;
    font-weight:600;
    backdrop-filter:blur(4px);
    line-height:1.2;
}
.hero-chip i{font-size:13px;color:#CFE0FF}
.article-hero h1{
    color:#fff;
    font-size:clamp(30px,3.6vw,46px);
    font-weight:700;
    line-height:1.32;
    letter-spacing:0;
    margin:0 0 14px;
    max-width:10em;
}
.article-hero-sub{color:rgba(255,255,255,.85);font-size:17px;max-width:720px;margin:0}
.article-main{background:var(--bg);padding:58px 0 78px}
.article-column{
    max-width:860px;
    margin:0 auto;
    background:var(--card);
    border:1px solid rgba(225,233,243,.70);
    border-radius:var(--radius-lg);
    box-shadow:var(--shadow-sm);
    padding:clamp(26px,4.6vw,58px);
}
.article-meta{
    display:flex;
    flex-wrap:wrap;
    gap:20px;
    padding-bottom:22px;
    margin-bottom:28px;
    border-bottom:1px solid var(--line);
    color:var(--muted);
    font-size:14px;
    line-height:1.6;
}
.article-meta span{display:inline-flex;align-items:center;gap:8px}
.article-meta i{color:var(--brand)}
.article-body{
    font-size:17px;
    line-height:1.95;
    color:var(--text);
    word-break:break-word;
}
.article-body > *:last-child{margin-bottom:0}
.article-body p{margin-bottom:1.7em}
.article-body h2{
    font-size:25px;
    font-weight:700;
    color:var(--text-deep);
    margin:2.5em 0 .9em;
    padding-left:15px;
    border-left:4px solid var(--brand);
    line-height:1.45;
}
.article-body h3{font-size:20px;font-weight:700;color:var(--text-deep);margin:2.1em 0 .8em}
.article-body h4{font-size:18px;font-weight:700;color:var(--text-deep);margin:1.8em 0 .7em}
.article-body ul,.article-body ol{margin:0 0 1.7em 1.4em;padding:0}
.article-body ul li{position:relative;padding-left:18px;margin-bottom:9px}
.article-body ul li::before{content:'';position:absolute;left:0;top:.78em;width:8px;height:8px;background:var(--brand);border-radius:2px}
.article-body ol li{margin-bottom:9px;list-style-type:decimal}
.article-body a{color:var(--brand);border-bottom:1px solid rgba(45,111,240,.3);padding-bottom:1px}
.article-body a:hover{color:var(--brand-dark);border-color:var(--brand-dark)}
.article-body blockquote{
    background:#F0F6FF;
    border-left:4px solid var(--accent);
    color:var(--text-deep);
    border-radius:0 14px 14px 0;
    padding:20px 24px;
    margin:0 0 1.8em;
    font-size:17px;
}
.article-body blockquote p{margin-bottom:.8em}
.article-body blockquote p:last-child{margin:0}
.article-body img{
    border-radius:18px;
    box-shadow:var(--shadow-sm);
    margin:28px auto;
    width:auto;
    max-height:560px;
    object-fit:cover;
}
.article-body table{
    width:100%;
    border-collapse:collapse;
    margin:0 0 1.8em;
    font-size:15px;
    line-height:1.7;
    display:block;
    overflow-x:auto;
}
.article-body table thead{background:#F0F6FF}
.article-body table th,.article-body table td{border:1px solid var(--line);padding:11px 14px;text-align:left;min-width:120px}
.article-body table th{color:var(--text-deep);font-weight:700}
.article-body em{font-style:italic}
.article-body strong{color:var(--text-deep);font-weight:700}
.post-pager{
    margin-top:44px;
    border-top:1px solid var(--line);
    padding-top:32px;
}
.pager-heading{
    font-size:19px;
    font-weight:700;
    color:var(--text-deep);
    margin-bottom:18px;
    display:flex;
    align-items:center;
    gap:10px;
}
.pager-heading::before{content:'';width:6px;height:6px;border-radius:50%;background:var(--accent)}
.follow-cards{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:18px;
}
.follow-card{
    display:grid;
    grid-template-columns:104px 1fr;
    align-items:stretch;
    background:#F8FAFD;
    border:1px solid var(--line);
    border-radius:16px;
    overflow:hidden;
    transition:all .22s ease;
}
.follow-card:hover{
    transform:translateY(-4px);
    box-shadow:var(--shadow-md);
    border-color:#BFD4FA;
}
.follow-card img{
    width:104px;
    height:104px;
    object-fit:cover;
    display:block;
}
.follow-card-body{padding:15px 16px;display:flex;flex-direction:column;gap:6px;justify-content:center}
.follow-card-label{font-size:12px;color:var(--accent);font-weight:600;letter-spacing:.6px}
.follow-card-title{font-size:16px;font-weight:700;color:var(--text-deep);line-height:1.5}
.follow-card-desc{font-size:13px;color:var(--muted);line-height:1.6}
.empty-state{
    text-align:center;
    background:#F8FAFD;
    border:1px dashed #CAD5E4;
    border-radius:var(--radius-lg);
    padding:74px 26px;
    color:var(--muted);
}
.empty-state i{font-size:44px;color:#B6C6DC;margin-bottom:18px}
.empty-state h2{font-size:26px;color:var(--text-deep);margin-bottom:12px}
.empty-state p{margin-bottom:24px}
.article-cta{
    background:var(--bg);
    padding-bottom:72px;
}
.cta-wrap{
    max-width:960px;
    margin:0 auto;
    padding:34px 34px;
    background:#EAF2FF;
    border:1px solid #CFE0FA;
    border-radius:var(--radius-lg);
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:28px;
    flex-wrap:wrap;
}
.cta-copy h2{font-size:22px;color:var(--text-deep);font-weight:700;margin-bottom:6px}
.cta-copy p{color:var(--muted);font-size:15px;margin:0}
.cta-action{flex-shrink:0}
.site-footer{
    background:#fff;
    border-top:1px solid var(--line);
    padding:60px 0 26px;
    color:var(--muted);
}
.footer-grid{
    display:grid;
    grid-template-columns:1.8fr 1fr 1fr 1.5fr;
    gap:42px;
    padding-bottom:40px;
    border-bottom:1px solid var(--line);
}
.footer-brand{font-size:24px;font-weight:800;color:var(--text-deep);margin-bottom:14px;display:flex;flex-wrap:wrap;gap:6px;line-height:1.2}
.footer-brand span{color:var(--brand)}
.footer-about{font-size:14px;line-height:1.9;margin-bottom:16px;max-width:420px}
.footer-tags{display:flex;flex-wrap:wrap;gap:8px}
.footer-tags a{
    display:inline-block;
    padding:5px 13px;
    background:#F0F6FF;
    color:var(--brand-dark);
    border-radius:var(--radius-pill);
    font-size:13px;
}
.footer-tags a:hover{background:var(--brand);color:#fff}
.footer-title{font-size:15px;font-weight:700;color:var(--text-deep);margin-bottom:16px}
.footer-list{display:flex;flex-direction:column;gap:10px}
.footer-list a{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:14px;line-height:1.5}
.footer-list a:hover{color:var(--brand)}
.footer-list i{color:#A9C0DE;font-size:12px}
.footer-contact{display:flex;flex-direction:column;gap:14px;font-size:14px;line-height:1.7}
.footer-contact li{display:flex;gap:10px;align-items:flex-start}
.footer-contact i{color:var(--brand);margin-top:5px}
.footer-bottom{
    padding-top:26px;
    text-align:center;
    font-size:14px;
    color:#8E9FB5;
    line-height:1.8;
}
@media (max-width:1024px){
    .footer-grid{grid-template-columns:1fr 1fr;gap:36px}
}
@media (max-width:900px){
    body{padding-top:90px}
    .site-header{top:10px}
    .header-shell{height:64px;border-radius:20px;padding:0 18px;gap:12px}
    .main-nav{
        position:absolute;
        top:calc(100% + 12px);
        left:0;
        width:100%;
        background:rgba(255,255,255,.98);
        border:1px solid rgba(225,233,243,.9);
        border-radius:18px;
        box-shadow:0 16px 40px rgba(19,52,110,.14);
        flex-direction:column;
        align-items:stretch;
        padding:14px;
        display:none;
    }
    .main-nav.open{display:flex}
    .main-nav a{width:100%;padding:12px 16px;border-radius:12px}
    .header-actions{margin-left:auto}
    .nav-toggle{display:flex}
    .nav-btn{line-height:36px;padding:0 16px;font-size:14px}
    .article-hero{padding:62px 0 60px;min-height:280px}
}
@media (max-width:700px){
    .article-column{padding:28px 22px}
    .follow-cards{grid-template-columns:1fr}
    .footer-grid{grid-template-columns:1fr}
    .article-meta{gap:10px 18px}
    .cta-wrap{flex-direction:column;align-items:flex-start;padding:26px 22px}
}
@media (max-width:520px){
    body{padding-top:84px;font-size:16px}
    .header-shell{padding:0 12px;gap:8px}
    .brand-mark{width:36px;height:36px;font-size:13px}
    .brand-cn{font-size:16px}
    .brand-cn small{display:none}
    .nav-btn{padding:0 12px;font-size:13px;line-height:32px;height:32px}
    .nav-toggle{width:38px;height:38px;border-radius:12px}
    .article-hero h1{font-size:28px}
    .article-hero-sub{font-size:15px}
    .article-body h2{font-size:21px}
    .article-body h3{font-size:18px}
    .article-body{font-size:16px;line-height:1.85}
    .cta-wrap{padding:22px 16px}
    .cta-copy h2{font-size:19px}
}

/* roulang page: category2 */
:root {
            --primary: #2D6FF0;
            --primary-deep: #1E4FC4;
            --teal: #10A891;
            --amber: #F27059;
            --bg: #F5F8FC;
            --white: #FFFFFF;
            --line: #E1E9F3;
            --text: #26435F;
            --heading: #172B44;
            --muted: #748CA5;
            --radius: 16px;
            --radius-lg: 24px;
            --shadow: 0 6px 24px rgba(19, 52, 110, 0.06);
            --shadow-lift: 0 16px 36px rgba(19, 52, 110, 0.12);
            --font-main: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: var(--font-main);
            font-size: 17px;
            line-height: 1.8;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
        }

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

        a:focus-visible,
        button:focus-visible {
            outline: 3px solid rgba(45, 111, 240, 0.35);
            outline-offset: 2px;
            border-radius: 6px;
        }

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

        ul,
        ol,
        p,
        h1,
        h2,
        h3,
        h4 {
            margin: 0;
            padding: 0;
        }

        section[id],
        footer[id] {
            scroll-margin-top: 120px;
        }

        .grid-container {
            max-width: 1200px;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            border: 0;
            border-radius: 999px;
            font-size: 16px;
            font-weight: 600;
            padding: 14px 30px;
            cursor: pointer;
            transition: all .25s ease;
            line-height: 1.2;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 12px 26px rgba(45, 111, 240, 0.24);
        }

        .btn-primary:hover {
            background: var(--primary-deep);
            transform: translateY(-2px);
            box-shadow: 0 16px 30px rgba(30, 79, 196, 0.28);
        }

        .btn-primary:active {
            transform: translateY(1px);
            box-shadow: 0 8px 18px rgba(45, 111, 240, 0.2);
        }

        .btn-line {
            background: transparent;
            color: var(--primary-deep);
            border: 1px solid rgba(45, 111, 240, 0.35);
        }

        .btn-line:hover {
            background: rgba(45, 111, 240, 0.08);
            border-color: var(--primary);
            transform: translateY(-2px);
        }

        .link-arrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--primary-deep);
            font-weight: 600;
            transition: gap .2s ease;
        }

        .link-arrow:hover {
            gap: 14px;
            color: var(--primary);
        }

        /* ===== Dock Header ===== */
        .site-header {
            position: fixed;
            top: 16px;
            left: 0;
            right: 0;
            z-index: 100;
            pointer-events: none;
            padding: 0 14px;
        }

        .header-shell {
            pointer-events: auto;
            max-width: 1180px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            gap: 14px;
            background: rgba(255, 255, 255, 0.88);
            border: 1px solid rgba(225, 233, 243, 0.95);
            border-radius: 999px;
            padding: 8px 12px 8px 16px;
            box-shadow: 0 14px 38px rgba(19, 52, 110, 0.09);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }

        .brand {
            display: inline-flex;
            align-items: center;
            gap: 12px;
            margin-right: 12px;
        }

        .brand-mark {
            width: 46px;
            height: 46px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--primary);
            border-radius: 16px;
            font-weight: 800;
            color: #fff;
            letter-spacing: .4px;
            font-size: 15px;
            box-shadow: 0 10px 20px rgba(45, 111, 240, .24);
        }

        .brand-cn {
            font-size: 19px;
            font-weight: 700;
            color: var(--heading);
            line-height: 1.25;
            white-space: nowrap;
        }

        .brand-cn small {
            display: block;
            font-size: 11px;
            font-weight: 500;
            color: var(--muted);
            letter-spacing: 2px;
            line-height: 1.2;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 2px;
            flex: 1;
        }

        .main-nav a {
            display: inline-flex;
            align-items: center;
            padding: 11px 18px;
            border-radius: 999px;
            color: var(--text);
            font-size: 15px;
            font-weight: 500;
            transition: all .22s ease;
            letter-spacing: .2px;
        }

        .main-nav a:hover {
            background: rgba(45, 111, 240, .08);
            color: var(--primary-deep);
        }

        .main-nav a.active {
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            box-shadow: 0 10px 22px rgba(45, 111, 240, .22);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .nav-btn {
            padding: 10px 22px;
            font-size: 15px;
        }

        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
            border: 1px solid var(--line);
            background: #fff;
            border-radius: 50%;
            color: var(--heading);
            font-size: 18px;
            cursor: pointer;
            transition: .2s ease;
        }

        .nav-toggle:hover {
            color: var(--primary);
            border-color: rgba(45, 111, 240, .4);
            box-shadow: 0 6px 18px rgba(19, 52, 110, .08);
        }

        /* ===== Category Hero ===== */
        .cate-hero {
            position: relative;
            padding: 178px 0 100px;
            overflow: hidden;
            background: var(--bg);
        }

        .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            opacity: .26;
            z-index: 0;
        }

        .cate-hero::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(115deg, rgba(255, 255, 255, .94) 0%, rgba(245, 248, 252, .72) 100%);
            z-index: 1;
        }

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

        .hero-crumbs {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 20px;
            font-size: 14px;
            color: var(--muted);
        }

        .hero-crumbs a:hover {
            color: var(--primary);
        }

        .hero-crumbs i {
            font-size: 12px;
            color: #b7cadf;
        }

        .hero-crumbs span {
            color: var(--primary-deep);
            font-weight: 600;
        }

        .hero-kicker {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(16, 168, 145, .12);
            color: #087d6f;
            font-size: 14px;
            font-weight: 600;
            padding: 7px 16px;
            border-radius: 999px;
            margin-bottom: 20px;
        }

        .hero-kicker::before {
            content: "";
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--teal);
            box-shadow: 0 0 0 4px rgba(16, 168, 145, .2);
        }

        .cate-hero h1 {
            font-size: clamp(38px, 5vw, 58px);
            line-height: 1.15;
            font-weight: 800;
            color: var(--heading);
            margin-bottom: 18px;
            letter-spacing: -.5px;
            max-width: 720px;
        }

        .cate-hero h1 span {
            color: var(--primary);
        }

        .hero-lead {
            max-width: 690px;
            font-size: 18px;
            line-height: 1.85;
            color: var(--text);
            margin-bottom: 34px;
        }

        .hero-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
        }

        /* ===== Content Sections ===== */
        .section {
            padding: 86px 0;
        }

        .section-head {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: end;
            gap: 16px;
            margin-bottom: 42px;
        }

        .section-head .eyebrow {
            display: inline-block;
            font-size: 15px;
            font-weight: 700;
            color: var(--teal);
            margin-bottom: 12px;
            letter-spacing: .6px;
        }

        .section-head h2 {
            font-size: clamp(28px, 3.4vw, 38px);
            font-weight: 750;
            color: var(--heading);
            line-height: 1.25;
            letter-spacing: -.2px;
        }

        .section-head p {
            max-width: 640px;
            color: var(--muted);
            margin-top: 10px;
        }

        .section-note {
            font-size: 15px;
            color: var(--muted);
        }

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

        .point-card {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 30px 28px;
            box-shadow: var(--shadow);
            border: 1px solid rgba(225, 233, 243, .55);
            transition: all .3s ease;
        }

        .point-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lift);
            border-color: rgba(45, 111, 240, .18);
        }

        .point-icon {
            width: 52px;
            height: 52px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 16px;
            font-size: 20px;
            color: #fff;
            margin-bottom: 20px;
            background: var(--primary);
        }

        .point-card:nth-child(2) .point-icon {
            background: var(--teal);
        }

        .point-card:nth-child(3) .point-icon {
            background: #f59757;
        }

        .point-card h3 {
            font-size: 22px;
            font-weight: 700;
            color: var(--heading);
            margin-bottom: 10px;
        }

        .point-card p {
            font-size: 15px;
            line-height: 1.8;
            color: var(--muted);
        }

        /* Topic Showcase */
        .topic-showcase {
            background: #fff;
            padding: 90px 0;
        }

        .showcase-list {
            display: grid;
            gap: 50px;
        }

        .showcase-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 44px;
            align-items: center;
        }

        .showcase-img {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lift);
            aspect-ratio: 16 / 10;
        }

        .showcase-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .5s ease;
        }

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

        .showcase-img .tag-number {
            position: absolute;
            top: 18px;
            left: 18px;
            background: rgba(255, 255, 255, .92);
            color: var(--primary-deep);
            font-size: 13px;
            font-weight: 700;
            border-radius: 999px;
            padding: 4px 13px;
            border: 1px solid rgba(45, 111, 240, .16);
        }

        .showcase-content h3 {
            font-size: 26px;
            font-weight: 750;
            color: var(--heading);
            margin-bottom: 14px;
            line-height: 1.4;
        }

        .showcase-content p {
            color: var(--muted);
            line-height: 1.9;
            margin-bottom: 20px;
        }

        .tag-group {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .tag {
            display: inline-block;
            padding: 6px 14px;
            background: rgba(45, 111, 240, .08);
            color: var(--primary-deep);
            border-radius: 999px;
            font-size: 14px;
            font-weight: 500;
        }

        .tag-teal {
            background: rgba(16, 168, 145, .1);
            color: #087d6f;
        }

        /* Information Path */
        .info-split {
            display: grid;
            grid-template-columns: 1.05fr .95fr;
            gap: 44px;
            align-items: stretch;
        }

        .context-block {
            padding: 38px 36px;
            background: var(--white);
            border-radius: var(--radius-lg);
            border: 1px solid rgba(225, 233, 243, .6);
            box-shadow: var(--shadow);
        }

        .context-block h2 {
            font-size: 24px;
            margin-bottom: 14px;
            color: var(--heading);
        }

        .context-block>p {
            color: var(--muted);
            margin-bottom: 22px;
        }

        .check-list {
            list-style: none;
            display: grid;
            gap: 18px;
        }

        .check-list li {
            display: flex;
            gap: 13px;
            color: var(--text);
            font-size: 15px;
        }

        .check-list i {
            flex: none;
            width: 26px;
            height: 26px;
            margin-top: 2px;
            background: rgba(16, 168, 145, .12);
            color: #087d6f;
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
        }

        .asset-panel {
            background: var(--primary-deep);
            border-radius: var(--radius-lg);
            padding: 36px 32px;
            color: #fff;
            display: flex;
            flex-direction: column;
        }

        .asset-panel h3 {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .asset-panel>p {
            color: rgba(255, 255, 255, .82);
            font-size: 15px;
            margin-bottom: 24px;
        }

        .mini-list {
            display: grid;
            gap: 13px;
            margin-bottom: 22px;
        }

        .mini-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 13px 16px;
            border-radius: 14px;
            background: rgba(255, 255, 255, .1);
            transition: background .2s;
        }

        .mini-item:hover {
            background: rgba(255, 255, 255, .17);
        }

        .mini-dot {
            flex: none;
            width: 10px;
            height: 10px;
            margin-top: 9px;
            border-radius: 50%;
            background: #fff;
        }

        .mini-title {
            font-weight: 600;
            font-size: 15px;
        }

        .mini-desc {
            font-size: 13px;
            color: rgba(255, 255, 255, .72);
        }

        .asset-link {
            margin-top: auto;
            color: #fff;
            font-weight: 600;
            font-size: 15px;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            border-top: 1px solid rgba(255, 255, 255, .2);
            padding-top: 18px;
            transition: gap .2s ease;
        }

        .asset-link:hover {
            gap: 16px;
            color: #fff;
        }

        /* Usage Scene */
        .usage-wrap {
            display: grid;
            grid-template-columns: 1.2fr 1fr 1fr;
            grid-template-rows: 1fr 1fr;
            gap: 24px;
        }

        .usage-card {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 30px 28px;
            box-shadow: var(--shadow);
            border: 1px solid rgba(225, 233, 243, .5);
            transition: .3s ease;
            min-height: 100%;
        }

        .usage-card.feature-item {
            grid-row: span 2;
            background: linear-gradient(145deg, #eef4fd, #fff);
        }

        .usage-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lift);
        }

        .usage-icon {
            width: 46px;
            height: 46px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(45, 111, 240, .12);
            color: var(--primary);
            font-size: 20px;
            margin-bottom: 16px;
        }

        .usage-card h3 {
            font-size: 20px;
            color: var(--heading);
            margin-bottom: 12px;
        }

        .usage-card p {
            color: var(--muted);
            font-size: 15px;
        }

        .usage-card strong {
            color: var(--heading);
        }

        /* FAQ */
        .faq-wrap {
            display: grid;
            gap: 16px;
            max-width: 900px;
        }

        .faq-card {
            background: #fff;
            border-radius: 18px;
            box-shadow: var(--shadow);
            border: 1px solid rgba(225, 233, 243, .55);
            overflow: hidden;
            transition: box-shadow .3s ease;
        }

        .faq-card:hover {
            box-shadow: var(--shadow-lift);
        }

        .faq-card details {
            padding: 4px 0;
        }

        .faq-card summary {
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            padding: 22px 28px;
            font-weight: 650;
            color: var(--heading);
            font-size: 17px;
            cursor: pointer;
            transition: background .2s;
        }

        .faq-card summary::before {
            content: "";
            flex: none;
            width: 10px;
            height: 10px;
            background: var(--primary);
            border-radius: 3px;
            margin-right: 14px;
        }

        .faq-card summary .arrow {
            margin-left: auto;
            width: 30px;
            height: 30px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(45, 111, 240, .1);
            color: var(--primary);
            font-size: 13px;
            transition: transform .3s ease;
        }

        .faq-card details[open] summary {
            background: rgba(45, 111, 240, .06);
        }

        .faq-card details[open] summary .arrow {
            transform: rotate(180deg);
            background: var(--primary);
            color: #fff;
        }

        .faq-card .answer {
            padding: 0 28px 24px 52px;
            color: var(--muted);
            font-size: 15px;
            line-height: 1.85;
        }

        /* Signup CTA */
        .cta-area {
            background: var(--white);
            padding: 80px 0 96px;
        }

        .cta-panel {
            position: relative;
            border-radius: 28px;
            overflow: hidden;
            background-image: url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            padding: 66px 60px;
            box-shadow: var(--shadow-lift);
            display: grid;
            grid-template-columns: .9fr 1.1fr;
            gap: 44px;
            align-items: center;
        }

        .cta-panel::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(100deg, rgba(237, 244, 253, .96) 30%, rgba(245, 248, 252, .78));
            z-index: 1;
        }

        .cta-inner {
            position: relative;
            z-index: 2;
        }

        .cta-panel h2 {
            font-size: clamp(24px, 3vw, 34px);
            line-height: 1.3;
            color: var(--heading);
            font-weight: 800;
            margin-bottom: 14px;
        }

        .cta-panel>div>p {
            color: var(--text);
            opacity: .85;
            max-width: 390px;
            margin-bottom: 20px;
        }

        .cta-form {
            position: relative;
            z-index: 2;
            background: rgba(255, 255, 255, .8);
            border: 1px solid rgba(255, 255, 255, .95);
            backdrop-filter: blur(6px);
            border-radius: 24px;
            padding: 28px;
            box-shadow: var(--shadow);
            display: grid;
            gap: 14px;
        }

        .cta-form label {
            display: grid;
            gap: 4px;
            font-size: 13px;
            font-weight: 600;
            color: var(--heading);
        }

        .cta-form input,
        .cta-form select {
            width: 100%;
            border: 1px solid var(--line);
            border-radius: 12px;
            padding: 14px 16px;
            font-size: 15px;
            color: var(--text);
            background: #fff;
            font-family: var(--font-main);
            transition: border .2s, box-shadow .2s;
        }

        .cta-form input:focus,
        .cta-form select:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 4px rgba(45, 111, 240, .12);
        }

        .cta-form button {
            width: 100%;
            margin-top: 6px;
        }

        .form-message {
            font-size: 13px;
            color: var(--muted);
            padding-top: 4px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #fff;
            border-top: 1px solid var(--line);
            padding: 70px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
            gap: 34px;
            margin-bottom: 44px;
        }

        .footer-brand {
            font-size: 22px;
            font-weight: 800;
            color: var(--heading);
            margin-bottom: 14px;
        }

        .footer-brand span {
            color: var(--primary);
        }

        .footer-about {
            color: var(--muted);
            font-size: 14px;
            max-width: 320px;
            margin-bottom: 18px;
            line-height: 1.8;
        }

        .footer-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .footer-tags a {
            padding: 6px 13px;
            border: 1px solid var(--line);
            border-radius: 999px;
            color: var(--primary-deep);
            font-size: 13px;
            font-weight: 500;
            transition: .2s;
        }

        .footer-tags a:hover {
            border-color: rgba(45, 111, 240, .3);
            background: rgba(45, 111, 240, .06);
        }

        .footer-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--heading);
            margin-bottom: 18px;
        }

        .footer-list {
            display: grid;
            gap: 10px;
        }

        .footer-list a {
            color: var(--muted);
            font-size: 15px;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            transition: color .2s, transform .2s;
        }

        .footer-list a:hover {
            color: var(--primary);
            transform: translateX(4px);
        }

        .footer-list a i {
            font-size: 11px;
            color: #a9bcd1;
        }

        .footer-list a:hover i {
            color: var(--primary);
        }

        .footer-contact {
            list-style: none;
            padding: 0;
            display: grid;
            gap: 12px;
            color: var(--muted);
            font-size: 14px;
        }

        .footer-contact i {
            width: 26px;
            color: var(--primary);
        }

        .footer-bottom {
            border-top: 1px solid var(--line);
            padding: 24px 0;
            text-align: center;
            color: #9cb0c6;
            font-size: 14px;
            letter-spacing: .4px;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .brand-cn {
                font-size: 17px;
            }

            .main-nav a {
                padding: 10px 12px;
                font-size: 14px;
            }

            .header-shell {
                gap: 6px;
            }

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

            .points-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .usage-wrap {
                grid-template-columns: 1fr 1fr;
            }

            .usage-card.feature-item {
                grid-row: auto;
            }

            .cta-panel {
                grid-template-columns: 1fr;
                padding: 44px 34px;
            }

            .cta-panel>div>p {
                max-width: none;
            }
        }

        @media (max-width: 868px) {
            .main-nav {
                display: flex;
                position: absolute;
                top: calc(100% + 14px);
                left: 6px;
                right: 6px;
                flex-direction: column;
                align-items: stretch;
                background: rgba(255, 255, 255, .98);
                border: 1px solid var(--line);
                box-shadow: 0 24px 50px rgba(19, 52, 110, .14);
                border-radius: 24px;
                padding: 12px;
                gap: 6px;
                opacity: 0;
                transform: translateY(-8px);
                pointer-events: none;
                transition: all .25s ease;
            }

            .site-header.nav-open .main-nav {
                opacity: 1;
                transform: translateY(0);
                pointer-events: auto;
            }

            .main-nav a {
                font-size: 16px;
                padding: 13px 16px;
            }

            .nav-toggle {
                display: inline-flex;
            }

            .nav-btn {
                display: none;
            }

            .brand-cn {
                font-size: 18px;
            }

            .showcase-row {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .info-split {
                grid-template-columns: 1fr;
            }

            .cate-hero {
                padding-top: 150px;
            }
        }

        @media (max-width: 720px) {
            body {
                font-size: 16px;
            }

            .section {
                padding: 68px 0;
            }

            .header-shell {
                border-radius: 28px;
                padding: 8px 14px 8px 10px;
            }

            .brand-cn {
                font-size: 16px;
            }

            .brand-mark {
                width: 42px;
                height: 42px;
                font-size: 14px;
            }

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

            .usage-wrap {
                grid-template-columns: 1fr;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }

            .cate-hero {
                padding-bottom: 62px;
            }

            .cate-hero h1 {
                font-size: 36px;
            }

            .tag-group {
                gap: 6px;
            }

            .faq-card summary {
                font-size: 16px;
                padding: 18px 18px;
            }

            .faq-card .answer {
                padding: 0 18px 20px 44px;
                font-size: 14px;
            }
        }

        @media (max-width: 520px) {
            .grid-container {
                padding-left: .85rem;
                padding-right: .85rem;
            }

            .header-shell {
                gap: 6px;
            }

            .brand-cn {
                font-size: 15px;
            }

            .brand-cn small {
                font-size: 10px;
            }

            .brand-mark {
                width: 38px;
                height: 38px;
                border-radius: 13px;
            }

            .header-actions {
                margin-left: auto;
                gap: 4px;
            }

            .nav-toggle {
                width: 40px;
                height: 40px;
            }

            .cate-hero h1 {
                font-size: 31px;
            }

            .hero-lead {
                font-size: 17px;
            }

            .hero-buttons .btn {
                width: 100%;
            }

            .hero-buttons .link-arrow {
                justify-content: center;
            }

            .context-block,
            .asset-panel {
                padding: 26px 22px;
            }

            .cta-panel {
                padding: 32px 18px;
                border-radius: 20px;
            }

            .cta-form {
                padding: 18px;
            }

            .btn {
                padding: 13px 20px;
            }

            .footer-bottom {
                font-size: 13px;
                padding: 20px 0;
            }
        }