/* roulang page: index */
:root {
            --color-paper: #F4F2EC;
            --color-panel: #FFFFFF;
            --color-ink: #15181A;
            --color-signal: #C3E934;
            --color-muted: #666B6E;
            --color-line: #E3E1D9;
            --color-deep: #0D0F10;
            --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
            --font-latin: "Inter", "Helvetica Neue", Arial, sans-serif;
            --radius-card: 12px;
            --radius-btn: 6px;
            --shadow-card: 0 12px 28px rgba(21, 24, 26, 0.06);
            --transition-base: cubic-bezier(0.22, 1, 0.36, 1);
        }

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

        html { scroll-behavior: smooth; }

        body {
            font-family: var(--font-sans);
            background-color: var(--color-paper);
            color: var(--color-ink);
            line-height: 1.8;
            -webkit-font-smoothing: antialiased;
            text-rendering: optimizeLegibility;
        }

        img { max-width: 100%; display: block; }
        a { text-decoration: none; color: inherit; }
        button { font-family: inherit; cursor: pointer; }

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

        .container-narrow { max-width: 760px; margin: 0 auto; padding-left: 24px; padding-right: 24px; }

        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            font-weight: 500;
            letter-spacing: 0.08em;
            color: var(--color-muted);
            margin-bottom: 18px;
        }
        .eyebrow .dot {
            width: 6px;
            height: 6px;
            background: var(--color-signal);
            display: inline-block;
            border-radius: 2px;
        }

        .section-title { font-size: clamp(1.8rem, 3vw, 2.8rem); font-weight: 700; line-height: 1.3; letter-spacing: -0.02em; }
        .section-desc { font-size: 16px; line-height: 1.8; color: var(--color-muted); }
        .section-lead { color: var(--color-muted); font-size: 16px; }

        .btn { display: inline-flex; align-items: center; gap: 10px; justify-content: center; }
        .btn-primary {
            background: var(--color-ink);
            border: 1px solid var(--color-ink);
            color: var(--color-paper);
            padding: 14px 28px;
            border-radius: var(--radius-btn);
            font-weight: 500;
            font-size: 15px;
            transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
        }
        .btn-primary:hover {
            background: var(--color-signal);
            color: var(--color-ink);
            transform: translateY(-2px);
            border-color: var(--color-signal);
        }
        .btn-primary:active { transform: translateY(0); }
        .btn-primary:focus-visible { outline: 2px solid var(--color-signal); outline-offset: 2px; }
        .btn-primary .arr { transition: transform 0.2s ease; }
        .btn-primary:hover .arr { transform: translateX(3px); }

        .btn-outline {
            background: transparent;
            border: 1px solid var(--color-line);
            color: var(--color-ink);
            padding: 13px 28px;
            border-radius: var(--radius-btn);
            font-weight: 500;
            font-size: 15px;
            transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease, color 0.2s ease;
        }
        .btn-outline:hover { border-color: var(--color-ink); background: var(--color-paper); color: var(--color-ink); transform: translateY(-2px); }
        .btn-outline:focus-visible { outline: 2px solid var(--color-signal); outline-offset: 2px; }

        /* header / nav */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: 76px;
            background: rgba(244, 242, 236, 0.92);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--color-line);
        }
        .navbar-desktop {
            display: grid;
            grid-template-columns: 1fr auto 1fr;
            align-items: center;
            height: 100%;
            max-width: 1380px;
            padding: 0 24px;
            margin: 0 auto;
        }
        .nav-left { display: flex; align-items: center; gap: 32px; justify-content: flex-start; }
        .nav-right { display: flex; align-items: center; gap: 32px; justify-content: flex-end; }

        .navbar-brand-title {
            font-size: 18px;
            font-weight: 800;
            color: var(--color-ink);
            white-space: nowrap;
            letter-spacing: -0.01em;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .navbar-brand-title .brand-mark {
            display: inline-block;
            width: 22px;
            height: 18px;
            position: relative;
            flex-shrink: 0;
        }
        .navbar-brand-title .brand-mark::before {
            content: "";
            position: absolute;
            width: 22px;
            height: 2px;
            background: var(--color-signal);
            top: 3px;
            left: 0;
            transform: rotate(-45deg);
        }
        .navbar-brand-title .brand-mark::after {
            content: "";
            position: absolute;
            width: 14px;
            height: 2px;
            background: var(--color-ink);
            bottom: 3px;
            left: 0;
            transform: rotate(-45deg);
        }

        .nav-link-item {
            font-size: 15px;
            font-weight: 500;
            color: var(--color-muted);
            transition: color 0.25s ease;
            position: relative;
            padding: 6px 0;
        }
        .nav-link-item::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--color-ink);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.25s ease;
            border-radius: 2px;
        }
        .nav-link-item:hover { color: var(--color-ink); }
        .nav-link-item:hover::after { transform: scaleX(1); }
        .nav-link-item.active { color: var(--color-ink); }
        .nav-link-item.active::after { transform: scaleX(1); }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--color-ink);
            color: var(--color-paper);
            padding: 8px 18px;
            border-radius: 6px;
            font-size: 14px;
            font-weight: 500;
            transition: background 0.2s ease, color 0.2s ease;
        }
        .nav-cta:hover { background: var(--color-signal); color: var(--color-ink); }

        .mobile-hamburger {
            display: none;
            width: 40px;
            height: 40px;
            border: 0;
            background: transparent;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 5px;
        }
        .mobile-hamburger span { display: block; width: 20px; height: 2px; background: var(--color-ink); border-radius: 2px; }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 76px;
            left: 0;
            right: 0;
            background: var(--color-paper);
            z-index: 999;
            border-bottom: 1px solid var(--color-line);
            padding: 20px 24px 28px;
            transform: translateY(-8px);
            opacity: 0;
            transition: opacity 0.3s ease, transform 0.3s ease;
            box-shadow: 0 20px 30px rgba(0,0,0,0.04);
        }
        .mobile-menu.show { opacity: 1; transform: translateY(0); }
        .mobile-menu a {
            display: block;
            padding: 12px 0;
            font-size: 16px;
            font-weight: 500;
            color: var(--color-ink);
            border-bottom: 1px solid var(--color-line);
        }
        .mobile-menu a:hover { color: var(--color-ink); }

        /* hero */
        .hero {
            min-height: 100vh;
            max-height: 960px;
            display: flex;
            align-items: center;
            position: relative;
            padding: 76px 0 0;
            background: var(--color-paper);
            background-image: linear-gradient(0deg, rgba(21,24,26,0.3) 0%, rgba(21,24,26,0.1) 35%, rgba(21,24,26,0.2) 60%), url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            color: #fff;
        }
        .hero::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(90deg, rgba(13,15,16,0.78) 0%, rgba(13,15,16,0.55) 45%, rgba(13,15,16,0.15) 100%);
        }
        .hero-content { position: relative; z-index: 2; width: 100%; }
        .hero-label {
            display: inline-block;
            font-size: 14px;
            background: rgba(255,255,255,0.1);
            border: 1px solid rgba(255,255,255,0.25);
            backdrop-filter: blur(6px);
            padding: 8px 16px;
            border-radius: 4px;
            letter-spacing: 0.06em;
            color: rgba(255,255,255,0.92);
            margin-bottom: 28px;
            font-weight: 500;
        }
        .hero h1 {
            font-size: clamp(2.6rem, 6vw, 4.8rem);
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -0.03em;
            color: #fff;
            max-width: 760px;
            margin-bottom: 24px;
        }
        .hero h1 .highlight {
            color: var(--color-signal);
        }
        .hero-sub {
            font-size: 18px;
            line-height: 1.7;
            color: rgba(255,255,255,0.88);
            max-width: 560px;
            margin-bottom: 40px;
        }
        .hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
        .hero .btn-outline-light { border-color: rgba(255,255,255,0.6); border-radius: 6px; background: transparent; color: #fff; padding: 13px 28px; font-weight: 500; }
        .hero .btn-outline-light:hover { border-color: #fff; background: #fff; color: var(--color-ink); transform: translateY(-2px); }

        .hero-meta {
            margin-top: 56px;
            padding-top: 24px;
            border-top: 1px solid rgba(255,255,255,0.2);
            display: flex;
            gap: 40px;
        }
        .hero-meta .meta-item { font-size: 14px; color: rgba(255,255,255,0.75); letter-spacing: 0.05em; }

        /* sections */
        .section { padding-top: clamp(80px, 10vw, 120px); padding-bottom: clamp(80px, 10vw, 120px); }
        .section-tight { padding-top: 0; padding-bottom: clamp(60px, 8vw, 100px); }
        .section-panel { background: var(--color-panel); }
        .section-separate { border-top: 1px solid var(--color-line); border-bottom: 1px solid var(--color-line); }

        .recent-card {
            background: var(--color-panel);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-card);
            padding: 32px;
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .recent-card .tag { font-size: 13px; color: var(--color-muted); margin-bottom: 12px; display: flex; align-items: center; gap: 6px; }
        .recent-card .tag .signal { color: var(--color-signal); width: 12px; height: 4px; display: inline-block; background: var(--color-signal); border-radius: 2px; }
        .recent-card h3 { font-size: 1.25rem; font-weight: 600; line-height: 1.5; margin-bottom: 14px; }
        .recent-card p { font-size: 15px; color: var(--color-muted); line-height: 1.7; flex: 1; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .recent-card .card-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 18px;
            padding-top: 16px;
            border-top: 1px solid var(--color-line);
            font-size: 13px;
            color: var(--color-muted);
        }
        .recent-card .read-link { color: var(--color-ink); font-weight: 500; display: inline-flex; gap: 4px; align-items: center; transition: gap 0.2s ease; }
        .recent-card .read-link:hover { gap: 8px; color: #333; }
        .recent-card.bg-ink { background: var(--color-ink); color: #fff; }
        .recent-card.bg-ink p, .recent-card.bg-ink .card-meta { color: rgba(255,255,255,0.72); }
        .recent-card.bg-ink .tag { color: rgba(255,255,255,0.6); }
        .recent-card.bg-ink .read-link { color: var(--color-signal); }

        .no-cms {
            background: var(--color-panel);
            border: 1px dashed var(--color-line);
            border-radius: var(--radius-card);
            padding: 40px;
            text-align: center;
        }
        .no-cms .icon { font-size: 30px; margin-bottom: 10px; }
        .no-cms p { color: var(--color-muted); font-size: 15px; }
        .no-cms a { color: var(--color-ink); text-decoration: underline; margin-top: 8px; display: inline-block; }

        /* concept */
        .concept-wrap .info-item {
            padding: 28px 0;
            border-bottom: 1px solid var(--color-line);
        }
        .concept-wrap .info-item:first-child { padding-top: 0; }
        .concept-wrap .num { font-size: 32px; font-weight: 800; color: var(--color-signal); font-family: var(--font-latin); margin-bottom: 6px; }
        .concept-wrap h3 { font-size: 22px; font-weight: 600; margin-bottom: 10px; }
        .concept-wrap p { font-size: 15px; color: var(--color-muted); line-height: 1.8; }
        .concept-thumb { margin: 24px 0; }
        .concept-thumb .thumb-cap { font-size: 13px; color: var(--color-muted); margin-top: 8px; padding-left: 2px; }

        .stick-stack { position: sticky; top: 110px; }
        @media (min-width: 992px) {
            .sticky-side { position: sticky; top: 100px; }
        }

        .featured-main { background: var(--color-panel); border: 1px solid var(--color-line); border-radius: var(--radius-card); overflow: hidden; height: 100%; display: flex; flex-direction: column; transition: border-color 0.3s ease; }
        .featured-main:hover { border-color: var(--color-ink); }
        .featured-main .thumb-wrap { height: 280px; overflow: hidden; }
        .featured-main .thumb-wrap img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
        .featured-main:hover .thumb-wrap img { transform: scale(1.03); }
        .featured-main .f-content { padding: 28px; display: flex; flex-direction: column; flex: 1; }
        .featured-main .cat { font-size: 13px; color: var(--color-muted); margin-bottom: 10px; letter-spacing: 0.05em; }
        .featured-main h3 { font-size: 24px; font-weight: 700; line-height: 1.4; margin-bottom: 12px; }
        .featured-main p { color: var(--color-muted); font-size: 15px; flex: 1; }
        .featured-main .arrow-link { display: inline-flex; align-items: center; gap: 6px; margin-top: 16px; font-weight: 500; color: var(--color-ink); }
        .featured-main .arrow-link .arr { transition: transform 0.2s ease; }
        .featured-main:hover .arrow-link .arr { transform: translateX(4px); }

        .featured-mini {
            background: var(--color-panel);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-card);
            display: flex;
            justify-content: space-between;
            gap: 24px;
            padding: 20px;
            transition: border-color 0.3s ease, box-shadow 0.3s ease;
            height: calc(50% - 12px);
        }
        .featured-mini:hover { border-color: var(--color-ink); box-shadow: var(--shadow-card); }
        .featured-mini .txt h3 { font-size: 17px; font-weight: 600; margin-bottom: 6px; }
        .featured-mini .txt p { font-size: 14px; color: var(--color-muted); line-height: 1.6; }
        .featured-mini .deco-square { width: 48px; height: 48px; min-width: 48px; background: var(--color-signal); display: flex; align-items: center; justify-content: center; border-radius: 8px; color: var(--color-ink); }
        .featured-mini:first-child { margin-bottom: 24px; }

        @media (max-width: 991px) {
            .right-stack { margin-top: 24px; }
            .right-stack .featured-mini { height: auto; margin-bottom: 24px; }
            .right-stack .featured-mini:last-child { margin-bottom: 0; }
        }

        .featured-half { background: var(--color-panel); border: 2px solid var(--color-ink); }

        /* band */
        .band { background: var(--color-ink); color: var(--color-paper); padding: clamp(80px, 10vw, 120px) 0; position: relative; }
        .band h2 { font-size: clamp(1.9rem, 3.2vw, 2.8rem); font-weight: 700; line-height: 1.4; }
        .band .lead { font-size: 18px; color: rgba(255,255,255,0.74); }
        .data-point { padding: 32px 0; border-top: 1px solid rgba(255,255,255,0.15); }
        .data-point .number { font-size: 56px; font-weight: 800; color: var(--color-signal); line-height: 1.1; font-family: var(--font-latin); }
        .data-point .unit { font-size: 16px; color: var(--color-muted); margin-left: 6px; }
        .data-point .label { margin-top: 14px; font-size: 15px; color: #fff; font-weight: 500; }
        .data-point .desc { font-size: 13px; color: rgba(255,255,255,0.6); margin-top: 6px; }
        .band-stat .row > div { margin-bottom: 24px; }
        .band .band-link { display: inline-flex; gap: 8px; color: var(--color-signal); font-weight: 500; }

        /* CTA section */
        .cta-signal {
            background: var(--color-signal);
            color: var(--color-ink);
            padding: 88px 0;
        }
        .cta-signal h2 { font-size: clamp(1.8rem, 3vw, 2.5rem); font-weight: 800; line-height: 1.35; }
        .cta-signal .sub { color: var(--color-ink); font-size: 17px; opacity: 0.8; margin-bottom: 28px; }
        .cta-signal input.form-control {
            border: 1px solid rgba(21, 24, 26, 0.2);
            background: #fff;
            color: var(--color-ink);
            padding: 14px 16px;
            border-radius: 4px;
            height: auto;
            font-size: 15px;
        }
        .cta-signal input.form-control:focus { border-color: var(--color-ink); box-shadow: 0 0 0 2px var(--color-ink); }
        .cta-signal .btn-subscribe {
            background: var(--color-ink);
            border: 1px solid var(--color-ink);
            color: var(--color-paper);
            padding: 14px 28px;
            border-radius: 4px;
            font-weight: 600;
            transition: background 0.2s ease, color 0.2s ease;
            height: auto;
            white-space: nowrap;
        }
        .cta-signal .btn-subscribe:hover { background: #fff; color: var(--color-ink); }
        .cta-signal .privacy { margin-top: 12px; font-size: 13px; opacity: 0.65; }
        .cta-signal .faq-link-text { font-size: 14px; text-align: right; margin-top: 10px; }
        @media (max-width: 767px) {
            .cta-signal .faq-link-text { text-align: left; }
        }

        .footer {
            background: var(--color-deep);
            color: rgba(255,255,255,0.8);
            padding: 72px 0 32px;
        }
        .footer h4 { font-size: 14px; font-weight: 500; color: rgba(255,255,255,0.5); margin-bottom: 16px; letter-spacing: 0.06em; }
        .footer .brand-area .footer-brand { font-size: 20px; font-weight: 800; color: #fff; margin-bottom: 12px; display: block; }
        .footer .brand-area p { color: rgba(255,255,255,0.55); font-size: 14px; line-height: 1.8; }
        .footer ul { list-style: none; padding: 0; margin: 0; }
        .footer ul li { margin-bottom: 10px; }
        .footer ul li a { color: rgba(255,255,255,0.72); font-size: 15px; transition: color 0.2s ease; }
        .footer ul li a:hover { color: #fff; }
        .footer .footer-bottom { margin-top: 56px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,0.1); font-size: 13px; color: rgba(255,255,255,0.5); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

        /* ------------ responsive ------------ */
        @media (max-width: 991px) {
            .navbar-desktop { display: flex; justify-content: space-between; }
            .nav-left.desktop, .nav-right.desktop { display: none; }
            .mobile-hamburger { display: flex; }
            .mobile-menu { display: block; }
            .hero { background-position: 68% center; height: auto; }
            .hero-content { padding-top: 60px; padding-bottom: 60px; }
        }
        @media (min-width: 992px) {
            .mobile-hamburger, .mobile-menu { display: none !important; }
        }
        @media (max-width: 767px) {
            .container-custom { padding-left: 20px; padding-right: 20px; }
            body { font-size: 15px; }
            .hero-meta { gap: 20px; flex-wrap: wrap; }
            .hero-meta .meta-item { font-size: 13px; }
            .cta-signal { padding: 60px 0; }
            .footer { padding-top: 48px; }
        }
        @media (max-width: 575px) {
            .hero { min-height: 100vh; }
            .hero-actions .btn { width: 100%; }
            .hero-actions { gap: 12px; }
            .section { padding-top: 60px; padding-bottom: 60px; }
        }

        /* animation */
        .reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.6s cubic-bezier(0.22,1,0.36,1), transform 0.6s cubic-bezier(0.22,1,0.36,1); }
        .reveal.visible { opacity: 1; transform: translateY(0); }
        @media (prefers-reduced-motion: reduce) {
            .reveal { opacity: 1 !important; transform: none !important; }
            html { scroll-behavior: auto; }
        }

/* roulang page: article */
:root {
            --color-paper: #F4F2EC;
            --color-panel: #FFFFFF;
            --color-ink: #15181A;
            --color-signal: #C3E934;
            --color-muted: #666B6E;
            --color-line: #E3E1D9;
            --color-deep: #0D0F10;
            --radius-card: 12px;
            --radius-btn: 6px;
            --shadow-hover: 0 12px 28px rgba(21, 24, 26, 0.06);
            --font-cn: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            --font-latin: "Inter", "Helvetica Neue", Arial, sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: var(--font-cn);
            background: var(--color-paper);
            color: var(--color-ink);
            line-height: 1.8;
            font-size: 16px;
            -webkit-text-size-adjust: 100%;
        }

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

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

        button,
        input {
            font-family: inherit;
        }

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

        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            letter-spacing: .08em;
            color: var(--color-muted);
            font-weight: 500;
            margin-bottom: 12px;
        }

        .eyebrow.signal {
            color: #3f4f00;
        }

        .section-space {
            padding: clamp(80px, 10vw, 120px) 0;
        }

        .btn {
            border-radius: var(--radius-btn);
            font-weight: 500;
            letter-spacing: .02em;
            transition: background .2s ease, color .2s ease, box-shadow .2s ease, transform .2s ease, border-color .2s ease;
        }

        .btn-primary,
        .btn-brand {
            background: var(--color-ink);
            color: var(--color-paper);
            border: 1px solid var(--color-ink);
            padding: 14px 28px;
        }

        .btn-primary:hover,
        .btn-primary:focus-visible,
        .btn-brand:hover,
        .btn-brand:focus-visible {
            background: var(--color-signal);
            color: var(--color-ink);
            border-color: var(--color-signal);
            transform: translateY(-2px);
            box-shadow: none;
        }

        .btn-primary:active,
        .btn-brand:active {
            transform: translateY(0);
        }

        .btn-outline {
            background: transparent;
            border: 1px solid var(--color-line);
            color: var(--color-ink);
            padding: 14px 28px;
        }

        .btn-outline:hover,
        .btn-outline:focus-visible {
            background: var(--color-paper);
            border-color: var(--color-ink);
            color: var(--color-ink);
        }

        .btn:focus-visible,
        .form-control:focus {
            outline: 2px solid var(--color-signal);
            outline-offset: 2px;
            box-shadow: none;
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 1040;
            background: rgba(244, 242, 236, 0.94);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--color-line);
        }

        .navbar-desktop {
            max-width: 1200px;
            margin: 0 auto;
            height: 76px;
            display: grid;
            grid-template-columns: 1fr auto 1fr;
            align-items: center;
            padding: 0 24px;
            gap: 16px;
            position: relative;
        }

        .nav-left,
        .nav-right {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .nav-right {
            justify-content: flex-end;
        }

        .nav-link-item {
            font-size: 15px;
            font-weight: 500;
            color: var(--color-muted);
            position: relative;
            padding: 6px 0;
            white-space: nowrap;
        }

        .nav-link-item::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 0;
            width: 100%;
            height: 2px;
            background: var(--color-ink);
            transform: scaleX(0);
            transform-origin: left center;
            transition: transform .25s ease;
        }

        .nav-link-item:hover,
        .nav-link-item.active {
            color: var(--color-ink);
        }

        .nav-link-item:hover::after,
        .nav-link-item.active::after {
            transform: scaleX(1);
        }

        .navbar-brand-title {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 800;
            color: var(--color-ink);
            letter-spacing: 0;
            white-space: nowrap;
        }

        .brand-mark {
            width: 30px;
            height: 22px;
            display: inline-block;
            position: relative;
            flex: none;
        }

        .brand-mark::before {
            content: "";
            display: block;
            width: 100%;
            height: 100%;
            background: linear-gradient(115deg, transparent 4%, var(--color-ink) 4% 28%, transparent 28% 42%, var(--color-signal) 42% 68%, transparent 68% 78%, var(--color-ink) 78% 100%);
            opacity: .95;
        }

        .brand-mark::after {
            content: "";
            position: absolute;
            right: 0;
            bottom: 1px;
            width: 7px;
            height: 7px;
            background: var(--color-signal);
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 9px 16px;
            background: var(--color-ink);
            color: var(--color-paper);
            border-radius: var(--radius-btn);
            font-size: 14px;
            transition: background .2s ease, color .2s ease, transform .2s ease;
        }

        .nav-cta:hover {
            background: var(--color-signal);
            color: var(--color-ink);
            transform: translateY(-1px);
        }

        .nav-cta span {
            transition: transform .2s ease;
        }

        .nav-cta:hover span {
            transform: translateX(3px);
        }

        .mobile-hamburger {
            display: none;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            gap: 5px;
            width: 44px;
            height: 44px;
            border: 1px solid var(--color-line);
            border-radius: 8px;
            background: transparent;
            cursor: pointer;
            transition: border-color .2s ease, background .2s ease;
        }

        .mobile-hamburger span {
            width: 20px;
            height: 2px;
            background: var(--color-ink);
            border-radius: 2px;
            transition: transform .25s ease, opacity .25s ease;
        }

        .mobile-hamburger[aria-expanded="true"] span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .mobile-hamburger[aria-expanded="true"] span:nth-child(2) {
            opacity: 0;
        }

        .mobile-hamburger[aria-expanded="true"] span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 76px;
            left: 0;
            right: 0;
            z-index: 1030;
            background: var(--color-panel);
            border-bottom: 1px solid var(--color-line);
            padding: 10px 24px 18px;
            flex-direction: column;
            box-shadow: 0 20px 40px rgba(21, 24, 26, .08);
        }

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

        .mobile-menu a {
            display: block;
            padding: 13px 0;
            font-size: 15px;
            font-weight: 500;
            color: var(--color-muted);
            border-bottom: 1px solid var(--color-line);
        }

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

        .mobile-menu a.active,
        .mobile-menu a:hover {
            color: var(--color-ink);
        }

        .breadcrumb-nav {
            padding: 24px 0 0;
        }

        .breadcrumb-list {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--color-muted);
            flex-wrap: wrap;
        }

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

        .breadcrumb-sep {
            color: #9a9e9f;
            font-size: 12px;
        }

        .article-hero {
            padding: 32px 0 16px;
            border-bottom: 1px solid var(--color-line);
        }

        .article-hero .container-custom {
            max-width: 860px;
        }

        .category-label {
            display: inline-flex;
            align-items: center;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: .08em;
            color: #4a5b00;
            background: rgba(195, 233, 52, .18);
            padding: 4px 10px;
            border-radius: 5px;
            margin-bottom: 18px;
        }

        .article-title {
            font-size: clamp(34px, 4.5vw, 46px);
            line-height: 1.35;
            font-weight: 800;
            margin: 0 0 24px;
            letter-spacing: -.01em;
        }

        .article-meta {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 10px;
            font-size: 14px;
            color: var(--color-muted);
            margin-bottom: 12px;
        }

        .article-meta .dot {
            width: 4px;
            height: 4px;
            border-radius: 50%;
            background: #b8b8af;
            display: inline-block;
        }

        .article-content-section {
            padding: 48px 0 72px;
        }

        .article-content-section .container-custom {
            max-width: 860px;
        }

        .cms-content {
            max-width: 760px;
            margin: 0 auto;
            font-size: 18px;
            line-height: 2;
            color: #222628;
        }

        .cms-content > *:first-child {
            margin-top: 0;
        }

        .cms-content p {
            margin: 0 0 24px;
        }

        .cms-content h2 {
            font-size: 28px;
            font-weight: 700;
            line-height: 1.5;
            margin: 48px 0 20px;
            padding-top: 10px;
            border-top: 1px solid var(--color-line);
        }

        .cms-content h3 {
            font-size: 22px;
            font-weight: 600;
            margin: 40px 0 16px;
        }

        .cms-content h4 {
            font-size: 18px;
            font-weight: 600;
            margin: 32px 0 12px;
        }

        .cms-content ul,
        .cms-content ol {
            margin: 0 0 24px;
            padding-left: 24px;
        }

        .cms-content li {
            margin-bottom: 8px;
        }

        .cms-content blockquote {
            margin: 32px 0;
            padding: 20px 24px;
            background: var(--color-panel);
            border-left: 4px solid var(--color-ink);
            color: var(--color-ink);
            font-size: 18px;
        }

        .cms-content img {
            border-radius: var(--radius-card);
            width: auto;
            max-width: 100%;
            height: auto;
            margin: 12px 0;
        }

        .cms-content figure {
            margin: 28px 0;
        }

        .cms-content figcaption {
            font-size: 13px;
            color: var(--color-muted);
            line-height: 1.6;
            margin-top: 6px;
        }

        .cms-content a {
            color: var(--color-ink);
            text-decoration: underline;
            text-underline-offset: 3px;
        }

        .cms-content a:hover {
            text-decoration-thickness: 3px;
        }

        .cms-content code {
            background: #eeece5;
            border-radius: 4px;
            padding: 2px 6px;
            font-size: .9em;
        }

        .article-tags {
            max-width: 760px;
            margin: 40px auto 0;
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            border-top: 1px solid var(--color-line);
            padding-top: 24px;
        }

        .article-tag {
            font-size: 13px;
            color: var(--color-muted);
            padding: 6px 10px;
            border: 1px solid var(--color-line);
            border-radius: 5px;
            background: rgba(255, 255, 255, .5);
            transition: border-color .2s, color .2s;
        }

        .article-tag:hover {
            color: var(--color-ink);
            border-color: var(--color-ink);
        }

        .article-missing {
            max-width: 760px;
            margin: 0 auto;
            text-align: center;
            padding: 80px 20px;
            border: 1px solid var(--color-line);
            border-radius: 16px;
            background: var(--color-panel);
        }

        .article-missing .missing-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: var(--color-signal);
            color: var(--color-ink);
            font-size: 28px;
            font-weight: 800;
            margin-bottom: 20px;
        }

        .article-missing h1 {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .article-missing p {
            color: var(--color-muted);
            margin-bottom: 24px;
        }

        .article-missing .btn + .btn {
            margin-left: 8px;
        }

        .related-section {
            background: var(--color-panel);
            border-top: 1px solid var(--color-line);
            padding: 72px 0 88px;
        }

        .related-header {
            margin-bottom: 36px;
        }

        .related-card {
            display: flex;
            flex-direction: column;
            height: 100%;
            border: 1px solid var(--color-line);
            border-radius: var(--radius-card);
            padding: 28px;
            background: var(--color-panel);
            transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
        }

        .related-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
            border-color: var(--color-ink);
        }

        .related-card .card-index {
            font-family: var(--font-latin);
            font-size: 13px;
            font-weight: 600;
            letter-spacing: .08em;
            color: var(--color-muted);
            margin-bottom: 14px;
        }

        .related-card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .related-card p {
            color: var(--color-muted);
            font-size: 15px;
            line-height: 1.8;
            margin-bottom: 18px;
            flex: 1;
        }

        .related-card .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-ink);
        }

        .related-card .card-link span {
            transition: transform .2s ease;
        }

        .related-card:hover .card-link span {
            transform: translateX(3px);
        }

        .footer {
            background: var(--color-deep);
            color: rgba(255, 255, 255, 0.72);
            padding: 72px 0 32px;
            font-size: 14px;
        }

        .footer .row > div {
            padding-top: 12px;
            padding-bottom: 12px;
        }

        .footer-brand {
            display: block;
            font-size: 20px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0;
        }

        .brand-area p {
            max-width: 330px;
            line-height: 1.9;
            color: rgba(255, 255, 255, 0.64);
        }

        .footer h4 {
            color: #9a9f9f;
            font-size: 13px;
            font-weight: 500;
            letter-spacing: .08em;
            margin: 0 0 16px;
            text-transform: none;
        }

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

        .footer ul li {
            margin-bottom: 10px;
        }

        .footer ul a {
            color: rgba(255, 255, 255, 0.74);
            transition: color .2s ease;
        }

        .footer ul a:hover {
            color: var(--color-paper);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.12);
            margin-top: 28px;
            padding-top: 22px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.45);
        }

        .footer-bottom a {
            color: rgba(255, 255, 255, 0.65);
        }

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

        @media (max-width: 991.98px) {
            .navbar-desktop {
                display: flex;
                align-items: center;
                justify-content: center;
                padding-left: 16px;
                padding-right: 16px;
                gap: 0;
            }

            .nav-left.desktop,
            .nav-right.desktop {
                display: none;
            }

            .mobile-hamburger {
                display: inline-flex;
                position: absolute;
                left: 16px;
                top: 16px;
            }

            .navbar-brand-title {
                font-size: 18px;
            }

            .brand-mark {
                width: 26px;
                height: 20px;
            }

            .article-title {
                font-size: 32px;
            }

            .cms-content {
                font-size: 17px;
                line-height: 2;
            }
        }

        @media (max-width: 767.98px) {
            .container-custom {
                padding-left: 20px;
                padding-right: 20px;
            }

            .navbar-desktop {
                padding-left: 14px;
                padding-right: 14px;
            }

            .mobile-hamburger {
                left: 14px;
            }

            .navbar-brand-title {
                font-size: 17px;
                gap: 8px;
            }

            .article-hero {
                padding-top: 24px;
            }

            .article-title {
                font-size: 29px;
                line-height: 1.45;
            }

            .cms-content {
                font-size: 16px;
                line-height: 2;
            }

            .cms-content h2 {
                font-size: 24px;
            }

            .cms-content h3 {
                font-size: 20px;
            }

            .article-content-section {
                padding-top: 36px;
            }

            .related-section {
                padding: 56px 0 72px;
            }

            .article-missing .btn {
                display: block;
                width: 100%;
                margin: 0 0 12px;
            }

            .article-missing .btn + .btn {
                margin-left: 0;
            }

            .footer {
                padding: 56px 0 28px;
            }
        }

        @media (max-width: 575.98px) {
            body {
                font-size: 15px;
            }

            .container-custom,
            .article-content-section .container-custom,
            .article-hero .container-custom {
                padding-left: 16px;
                padding-right: 16px;
            }

            .navbar-desktop {
                padding-left: 8px;
                padding-right: 8px;
            }

            .mobile-hamburger {
                left: 8px;
                top: 14px;
                width: 42px;
                height: 42px;
            }

            .navbar-brand-title {
                font-size: 16px;
            }

            .article-title {
                font-size: 26px;
                line-height: 1.5;
            }

            .article-meta {
                gap: 6px;
                font-size: 13px;
            }

            .breadcrumb-list {
                font-size: 12px;
            }

            .mobile-menu {
                padding-left: 16px;
                padding-right: 16px;
            }

            .cms-content blockquote {
                padding: 16px 18px;
            }

            .related-card {
                padding: 24px;
            }

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }

        @media (prefers-reduced-motion: reduce) {
            *,
            *::before,
            *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
                scroll-behavior: auto !important;
            }
        }

/* roulang page: category1 */
:root {
            --color-paper: #F4F2EC;
            --color-panel: #FFFFFF;
            --color-ink: #15181A;
            --color-signal: #C3E934;
            --color-muted: #666B6E;
            --color-line: #E3E1D9;
            --color-deep: #0D0F10;
            --radius-card: 12px;
            --radius-btn: 6px;
            --transition-base: 0.3s cubic-bezier(0.22, 1, 0.36, 1);
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            background: var(--color-paper);
            color: var(--color-ink);
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", "Helvetica Neue", Arial, sans-serif;
            font-size: 16px;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }

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

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

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

        button,
        input {
            font-family: inherit;
        }

        a:focus-visible,
        button:focus-visible {
            outline: 2px solid var(--color-signal);
            outline-offset: 3px;
        }

        .container-custom {
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        .section {
            padding: clamp(80px, 10vw, 120px) 0;
        }

        .section-head {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            gap: 32px;
            margin-bottom: 48px;
        }

        .section-head h2 {
            margin: 12px 0 0;
            font-size: clamp(1.8rem, 3vw, 2.8rem);
            font-weight: 700;
            line-height: 1.3;
            letter-spacing: -0.01em;
        }

        .section-head p {
            margin: 14px 0 0;
            max-width: 520px;
            color: var(--color-muted);
            font-size: 16px;
        }

        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.08em;
            color: var(--color-ink);
            text-transform: none;
            margin: 0;
        }

        .eyebrow .eyebrow-num {
            color: var(--color-signal);
            font-weight: 800;
            font-family: "Inter", "Helvetica Neue", sans-serif;
            font-size: 16px;
        }

        .eyebrow:before {
            content: "";
            display: inline-block;
            width: 24px;
            height: 1px;
            background: var(--color-ink);
            vertical-align: middle;
        }

        .text-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 600;
            color: var(--color-ink);
            border-bottom: 1px solid var(--color-line);
            padding-bottom: 4px;
            transition: border-color 0.25s ease;
        }

        .text-link span {
            transition: transform 0.3s ease;
        }

        .text-link:hover {
            border-color: var(--color-ink);
        }

        .text-link:hover span {
            transform: translateX(4px);
        }

        .btn-action {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            padding: 14px 28px;
            border-radius: var(--radius-btn);
            font-size: 15px;
            font-weight: 600;
            line-height: 1.4;
            border: 1px solid transparent;
            cursor: pointer;
            transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
            white-space: nowrap;
        }

        .btn-action span {
            transition: transform 0.25s ease;
        }

        .btn-action:hover span {
            transform: translateX(4px);
        }

        .btn-action--signal {
            background: var(--color-signal);
            color: var(--color-ink);
            border-color: var(--color-signal);
        }

        .btn-action--signal:hover {
            background: #ffffff;
            color: var(--color-ink);
            border-color: #ffffff;
            transform: translateY(-2px);
        }

        .btn-action--ghost {
            background: transparent;
            color: var(--color-paper);
            border-color: rgba(255, 255, 255, 0.45);
        }

        .btn-action--ghost:hover {
            background: var(--color-paper);
            color: var(--color-ink);
            border-color: var(--color-paper);
            transform: translateY(-2px);
        }

        .btn-action--ink {
            background: var(--color-ink);
            color: var(--color-paper);
            border-color: var(--color-ink);
        }

        .btn-action--ink:hover {
            background: var(--color-signal);
            color: var(--color-ink);
            border-color: var(--color-signal);
            transform: translateY(-2px);
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1040;
            background: rgba(244, 242, 236, 0.92);
            -webkit-backdrop-filter: blur(14px);
            backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--color-line);
        }

        .navbar-desktop {
            max-width: 1360px;
            margin: 0 auto;
            height: 76px;
            display: grid;
            grid-template-columns: 1fr auto 1fr;
            align-items: center;
            padding: 0 32px;
            gap: 20px;
        }

        .desktop {
            display: flex;
            align-items: center;
            gap: 30px;
        }

        .nav-left {
            justify-content: flex-start;
        }

        .nav-right {
            justify-content: flex-end;
        }

        .navbar-brand-title {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 18px;
            font-weight: 800;
            color: var(--color-ink);
            letter-spacing: -0.01em;
            white-space: nowrap;
            transition: opacity 0.25s ease;
        }

        .navbar-brand-title:hover {
            opacity: 0.78;
        }

        .brand-mark {
            display: inline-block;
            width: 22px;
            height: 22px;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none'%3E%3Cpath d='M4 17 L10 8 L19 11' stroke='%23C3E934' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'/%3E%3Cpath d='M5 21H20' stroke='%2315181A' stroke-width='2.2' stroke-linecap='round'/%3E%3C/svg%3E");
            background-size: contain;
            background-position: center;
            background-repeat: no-repeat;
        }

        .nav-link-item {
            position: relative;
            display: inline-block;
            font-size: 15px;
            font-weight: 500;
            color: var(--color-muted);
            padding: 28px 0;
            transition: color 0.25s ease;
        }

        .nav-link-item:after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 20px;
            height: 2px;
            width: 100%;
            background: var(--color-ink);
            transform: scaleX(0);
            transform-origin: left center;
            transition: transform 0.25s ease;
        }

        .nav-link-item:hover,
        .nav-link-item.active {
            color: var(--color-ink);
        }

        .nav-link-item:hover:after,
        .nav-link-item.active:after {
            transform: scaleX(1);
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 9px 20px;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-paper);
            background: var(--color-ink);
            border-radius: var(--radius-btn);
            border: 1px solid var(--color-ink);
            transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
        }

        .nav-cta span {
            transition: transform 0.25s ease;
        }

        .nav-cta:hover {
            background: var(--color-signal);
            color: var(--color-ink);
            border-color: var(--color-signal);
        }

        .nav-cta:hover span {
            transform: translateX(3px);
        }

        .mobile-hamburger {
            display: none;
            width: 42px;
            height: 42px;
            border: 0;
            background: transparent;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            gap: 5px;
            cursor: pointer;
            padding: 0;
        }

        .mobile-hamburger span {
            width: 22px;
            height: 2px;
            background: var(--color-ink);
            display: block;
            transition: transform 0.25s ease, opacity 0.25s ease;
        }

        .mobile-hamburger.active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .mobile-hamburger.active span:nth-child(2) {
            opacity: 0;
        }

        .mobile-hamburger.active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        .mobile-menu {
            display: none;
            flex-direction: column;
            background: var(--color-paper);
            border-bottom: 1px solid var(--color-line);
            padding: 10px 24px 24px;
        }

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

        .mobile-menu a {
            display: block;
            padding: 14px 0;
            font-size: 16px;
            font-weight: 500;
            color: var(--color-ink);
            border-bottom: 1px solid var(--color-line);
        }

        .mobile-menu a:last-child {
            border-bottom: 0;
        }

        .mobile-menu a.active {
            font-weight: 700;
        }

        /* ===== Page Banner ===== */
        .page-banner {
            position: relative;
            padding: 96px 0 76px;
            border-bottom: 1px solid var(--color-line);
            background:
                linear-gradient(94deg, rgba(244, 242, 236, 1) 15%, rgba(244, 242, 236, 0.82) 52%, rgba(244, 242, 236, 0.2) 90%),
                url("/assets/images/backpic/back-1.png") center / cover no-repeat;
        }

        .breadcrumb-nav {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--color-muted);
            margin-bottom: 40px;
        }

        .breadcrumb-nav a {
            transition: color 0.2s ease;
        }

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

        .breadcrumb-nav .breadcrumb-current {
            font-weight: 500;
            color: var(--color-ink);
        }

        .page-banner h1 {
            max-width: 780px;
            margin: 0;
            font-size: clamp(2.8rem, 6vw, 4.8rem);
            font-weight: 900;
            line-height: 1.15;
            letter-spacing: -0.02em;
            color: var(--color-ink);
        }

        .banner-sub {
            margin-top: 24px;
            max-width: 650px;
            font-size: 18px;
            line-height: 1.9;
            color: var(--color-muted);
        }

        /* ===== Feature Cards ===== */
        .feature-section {
            background: var(--color-paper);
            padding-bottom: clamp(70px, 8vw, 100px);
        }

        .feature-card {
            display: flex;
            flex-direction: column;
            background: var(--color-panel);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-card);
            overflow: hidden;
            height: 100%;
            color: var(--color-ink);
            transition: box-shadow 0.35s ease, transform 0.35s ease, border-color 0.35s ease;
        }

        .feature-card:hover {
            box-shadow: 0 12px 28px rgba(21, 24, 26, 0.06);
            transform: translateY(-2px);
            border-color: var(--color-ink);
        }

        .feature-card .feature-thumb {
            position: relative;
            overflow: hidden;
            background: var(--color-line);
        }

        .feature-card .feature-thumb img {
            width: 100%;
            height: 100%;
            transition: transform 0.45s ease;
        }

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

        .feature-card .feature-body {
            display: flex;
            flex-direction: column;
            flex: 1;
            padding: 26px 28px 28px;
        }

        .feature-card .feature-tag {
            align-self: flex-start;
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.08em;
            color: var(--color-muted);
            margin: 0 0 14px;
        }

        .feature-card .feature-title {
            font-size: 24px;
            font-weight: 700;
            line-height: 1.45;
            margin: 0 0 14px;
        }

        .feature-card .feature-desc {
            font-size: 15px;
            line-height: 1.85;
            color: var(--color-muted);
            margin: 0 0 20px;
        }

        .feature-card .feature-more {
            margin-top: auto;
            color: var(--color-ink);
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .feature-card .feature-more span {
            transition: transform 0.3s ease;
        }

        .feature-card:hover .feature-more span {
            transform: translateX(4px);
        }

        .feature-card--primary .feature-thumb {
            height: 250px;
        }

        .feature-card--compact .feature-thumb {
            height: 178px;
        }

        .feature-card--compact .feature-title {
            font-size: 20px;
        }

        .feature-card--compact .feature-body {
            padding: 22px 24px 24px;
        }

        /* ===== Index List ===== */
        .index-section {
            background: var(--color-panel);
            border-top: 1px solid var(--color-line);
            border-bottom: 1px solid var(--color-line);
        }

        .topic-list {
            border-top: 1px solid var(--color-line);
        }

        .edition-row {
            display: grid;
            grid-template-columns: 80px minmax(0, 1fr) 170px 24px;
            gap: 28px;
            align-items: baseline;
            padding: 32px 0;
            border-bottom: 1px solid var(--color-line);
            transition: background 0.25s ease;
        }

        .edition-num {
            font-family: "Inter", "Helvetica Neue", sans-serif;
            font-size: 22px;
            font-weight: 500;
            letter-spacing: 0.02em;
            color: var(--color-muted);
        }

        .edition-title {
            font-size: 20px;
            font-weight: 600;
            line-height: 1.5;
            margin: 0 0 6px;
            color: var(--color-ink);
            transition: color 0.25s ease;
        }

        .edition-desc {
            font-size: 15px;
            line-height: 1.85;
            color: var(--color-muted);
            margin: 0;
            max-width: 720px;
        }

        .edition-tag {
            font-size: 12px;
            color: var(--color-muted);
            letter-spacing: 0.08em;
            font-weight: 600;
            text-align: right;
            white-space: nowrap;
        }

        .edition-arrow {
            font-size: 24px;
            font-weight: 300;
            text-align: center;
            color: var(--color-ink);
            transition: transform 0.3s ease;
        }

        .edition-row:hover .edition-arrow {
            transform: translateX(4px);
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--color-deep);
            color: var(--color-paper);
            padding: clamp(64px, 8vw, 96px) 0;
        }

        .cta-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 48px;
        }

        .cta-copy h2 {
            font-size: clamp(1.9rem, 3vw, 2.8rem);
            font-weight: 800;
            line-height: 1.35;
            margin: 0 0 16px;
            color: var(--color-paper);
            letter-spacing: -0.01em;
        }

        .cta-copy p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.72);
            margin: 0;
            max-width: 560px;
        }

        .cta-actions {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-shrink: 0;
        }

        /* ===== Tags ===== */
        .tags-section {
            background: var(--color-paper);
        }

        .tags-wrap {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }

        .tag-pill {
            display: inline-flex;
            align-items: center;
            padding: 10px 18px;
            background: var(--color-panel);
            color: var(--color-ink);
            border: 1px solid var(--color-line);
            border-radius: 999px;
            font-size: 14px;
            line-height: 1.4;
            font-weight: 500;
            transition: border-color 0.25s ease, background 0.25s ease, transform 0.25s ease;
        }

        .tag-pill:hover {
            border-color: var(--color-ink);
            transform: translateY(-2px);
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--color-deep);
            color: rgba(255, 255, 255, 0.76);
            padding: 72px 0 32px;
            font-size: 15px;
        }

        .footer .brand-area {
            padding-right: 24px;
        }

        .footer-brand {
            display: inline-block;
            font-size: 20px;
            font-weight: 800;
            color: #ffffff;
            margin-bottom: 16px;
            letter-spacing: -0.01em;
        }

        .footer p {
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.9;
        }

        .footer h4 {
            color: rgba(255, 255, 255, 0.46);
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.08em;
            margin-bottom: 22px;
            margin-top: 8px;
        }

        .footer ul li {
            margin-bottom: 10px;
        }

        .footer ul li a {
            color: rgba(255, 255, 255, 0.72);
            transition: color 0.2s ease, padding-left 0.2s ease;
        }

        .footer ul li a:hover {
            color: var(--color-paper);
            padding-left: 4px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 24px;
            margin-top: 48px;
            display: flex;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.42);
        }

        /* ===== Motion ===== */
        @keyframes fadeUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .fade-up {
            opacity: 0;
        }

        .fade-up.visible {
            animation: fadeUp 0.6s cubic-bezier(0.22, 1, 0.36, 1) forwards;
        }

        @media (prefers-reduced-motion: reduce) {
            * {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
                scroll-behavior: auto !important;
            }
            .fade-up {
                opacity: 1;
            }
            .fade-up.visible {
                animation: none;
                opacity: 1;
            }
        }

        /* ===== Responsive ===== */
        @media (max-width: 991.98px) {
            .navbar-desktop {
                grid-template-columns: 1fr auto 1fr;
                padding: 0 20px;
            }

            .desktop {
                display: none;
            }

            .navbar-brand-title {
                justify-self: center;
                grid-column: 2;
                font-size: 17px;
            }

            .mobile-hamburger {
                display: flex;
                grid-column: 1;
                justify-self: start;
            }

            .nav-cta-inline {
                display: none;
            }

            .section-head {
                flex-direction: column;
                align-items: flex-start;
            }

            .edition-row {
                grid-template-columns: 60px 1fr 24px;
                gap: 18px;
            }

            .edition-tag {
                display: none;
            }
        }

        @media (max-width: 767.98px) {
            .navbar-desktop {
                height: 68px;
            }

            .navbar-brand-title {
                font-size: 16px;
                gap: 7px;
            }

            .container-custom {
                padding-left: 20px;
                padding-right: 20px;
            }

            .page-banner {
                padding: 68px 0 56px;
                background:
                    linear-gradient(180deg, rgba(244, 242, 236, 0.96) 18%, rgba(244, 242, 236, 0.72) 100%),
                    url("/assets/images/backpic/back-1.png") center / cover no-repeat;
            }

            .breadcrumb-nav {
                margin-bottom: 28px;
            }

            .page-banner h1 {
                font-size: clamp(2.2rem, 7vw, 3.2rem);
            }

            .banner-sub {
                font-size: 16px;
                line-height: 1.85;
            }

            .feature-section {
                padding-bottom: 60px;
            }

            .feature-card--primary .feature-thumb {
                height: 220px;
            }

            .section-head {
                margin-bottom: 32px;
            }

            .section-head p {
                max-width: none;
            }

            .topic-list {
                margin-top: 20px;
            }

            .edition-row {
                grid-template-columns: 46px 1fr;
                gap: 12px;
                padding: 24px 0;
            }

            .edition-num {
                font-size: 18px;
            }

            .edition-title {
                font-size: 18px;
            }

            .edition-desc {
                font-size: 14px;
                grid-column: 2;
            }

            .edition-arrow {
                display: none;
            }

            .cta-inner {
                flex-direction: column;
                align-items: flex-start;
                gap: 32px;
            }

            .cta-actions {
                flex-wrap: wrap;
                width: 100%;
            }

            .cta-actions .btn-action {
                width: 100%;
            }

            .cta-copy p {
                font-size: 15px;
            }

            .footer {
                padding-top: 56px;
            }

            .footer-bottom {
                margin-top: 32px;
                flex-direction: column;
                gap: 4px;
            }
        }

        @media (max-width: 575.98px) {
            body {
                font-size: 15px;
            }

            .container-custom {
                padding-left: 16px;
                padding-right: 16px;
            }

            .navbar-desktop {
                padding: 0 16px;
            }

            .navbar-brand-title {
                font-size: 15px;
            }

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

            .feature-card .feature-title {
                font-size: 21px;
            }

            .feature-card--compact .feature-title {
                font-size: 18px;
            }

            .feature-card--compact .feature-body {
                padding: 18px 20px 20px;
            }

            .page-banner h1 {
                font-size: 2.1rem;
            }

            .cta-copy h2 {
                font-size: 1.7rem;
            }

            .btn-action {
                padding: 14px 22px;
                white-space: normal;
            }

            .tag-pill {
                padding: 8px 14px;
                font-size: 13px;
            }

            .footer p,
            .footer ul li {
                font-size: 14px;
            }
        }

/* roulang page: category2 */
/* ============================================
           设计变量与基础 Reset
        ============================================ */
        :root {
            --color-paper: #F4F2EC;
            --color-panel: #FFFFFF;
            --color-ink: #15181A;
            --color-signal: #C3E934;
            --color-muted: #666B6E;
            --color-line: #E3E1D9;
            --color-deep: #0D0F10;
            --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
            --font-latin: "Inter", "Helvetica Neue", Arial, sans-serif;
            --radius-lg: 12px;
            --radius-md: 8px;
            --radius-sm: 6px;
            --shadow-hover: 0 12px 28px rgba(21, 24, 26, 0.06);
            --transition-base: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--color-paper);
            color: var(--color-ink);
            line-height: 1.8;
            font-size: 16px;
            overflow-x: hidden;
        }

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

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

        a:hover {
            color: var(--color-ink);
        }

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

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

        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--color-signal);
            outline-offset: 2px;
        }

        /* ============================================
           通用布局容器
        ============================================ */
        .container-custom {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        .container-narrow {
            width: 100%;
            max-width: 1160px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* ============================================
           导航栏 — 居中 Logo + 两翼组合
        ============================================ */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1030;
            background-color: rgba(244, 242, 236, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--color-line);
            height: 76px;
        }

        .navbar-desktop {
            max-width: 1280px;
            margin: 0 auto;
            height: 76px;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            position: relative;
        }

        .navbar-brand-title {
            font-weight: 800;
            font-size: 18px;
            color: var(--color-ink);
            display: flex;
            align-items: center;
            gap: 8px;
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            letter-spacing: 0.01em;
            white-space: nowrap;
        }

        .navbar-brand-title .brand-mark {
            width: 20px;
            height: 20px;
            display: inline-block;
            position: relative;
            flex-shrink: 0;
        }

        .navbar-brand-title .brand-mark::before {
            content: '';
            position: absolute;
            width: 16px;
            height: 16px;
            border-right: 3px solid var(--color-signal);
            border-top: 3px solid var(--color-ink);
            transform: rotate(45deg) translate(-1px, -1px);
            top: 4px;
            left: 2px;
        }

        .nav-left,
        .nav-right {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .nav-link-item {
            font-size: 15px;
            font-weight: 500;
            color: var(--color-muted);
            position: relative;
            padding: 8px 0;
            letter-spacing: 0.02em;
        }

        .nav-link-item::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--color-ink);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.25s ease;
        }

        .nav-link-item:hover {
            color: var(--color-ink);
        }

        .nav-link-item:hover::after {
            transform: scaleX(1);
        }

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

        .nav-link-item.active::after {
            transform: scaleX(1);
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 20px;
            border-radius: var(--radius-sm);
            background-color: var(--color-ink);
            color: var(--color-paper);
            font-size: 14px;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .nav-cta span {
            transition: transform 0.3s ease;
        }

        .nav-cta:hover {
            background-color: var(--color-signal);
            color: var(--color-ink);
            transform: translateY(-2px);
        }

        .nav-cta:hover span {
            transform: translateX(3px);
        }

        .mobile-hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
        }

        .mobile-hamburger span {
            display: block;
            width: 20px;
            height: 2px;
            background-color: var(--color-ink);
            transition: all 0.3s ease;
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 76px;
            left: 0;
            width: 100%;
            background-color: var(--color-paper);
            border-bottom: 1px solid var(--color-line);
            padding: 16px 24px 24px;
            flex-direction: column;
            gap: 4px;
            z-index: 1020;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
        }

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

        .mobile-menu a {
            padding: 12px 8px;
            border-bottom: 1px solid var(--color-line);
            font-size: 16px;
            font-weight: 500;
            color: var(--color-ink);
        }

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

        .mobile-menu a.active {
            color: var(--color-ink);
            font-weight: 700;
            border-left: 3px solid var(--color-signal);
            padding-left: 12px;
        }

        /* ============================================
           通用标题组件
        ============================================ */
        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            font-weight: 500;
            color: var(--color-ink);
            letter-spacing: 0.08em;
            text-transform: uppercase;
            font-family: var(--font-latin);
            margin-bottom: 16px;
        }

        .eyebrow::before {
            content: '';
            width: 24px;
            height: 2px;
            background-color: var(--color-signal);
            display: inline-block;
        }

        .section-title {
            font-weight: 700;
            font-size: clamp(1.8rem, 3vw, 2.8rem);
            line-height: 1.3;
            color: var(--color-ink);
            margin-bottom: 16px;
        }

        .section-lead {
            font-size: 16px;
            color: var(--color-muted);
            line-height: 1.8;
            max-width: 560px;
        }

        /* 通用板块间距 */
        .page-section {
            padding: clamp(60px, 8vw, 96px) 0;
        }

        .page-section-sm {
            padding: clamp(40px, 5vw, 64px) 0;
        }

        /* ============================================
           分类页顶部 Banner
        ============================================ */
        .category-banner {
            position: relative;
            min-height: 340px;
            padding: 80px 0 60px;
            background-color: var(--color-paper);
            border-bottom: 1px solid var(--color-line);
            overflow: hidden;
        }

        .category-banner .bg-wrap {
            position: absolute;
            inset: 0;
            z-index: 0;
        }

        .category-banner .bg-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.18;
        }

        .category-banner .banner-content {
            position: relative;
            z-index: 2;
        }

        .category-banner h1 {
            font-size: clamp(2.2rem, 4vw, 3.2rem);
            font-weight: 800;
            margin: 16px 0 20px;
            line-height: 1.25;
            letter-spacing: 0.01em;
        }

        .category-banner .breadcrumb-line {
            font-size: 13px;
            color: var(--color-muted);
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 12px;
        }

        .category-banner .breadcrumb-line a {
            color: var(--color-muted);
            transition: color 0.3s;
        }

        .category-banner .breadcrumb-line a:hover {
            color: var(--color-ink);
        }

        .category-banner .breadcrumb-line .current {
            color: var(--color-ink);
            font-weight: 500;
        }

        .banner-meta {
            margin-top: 28px;
            display: flex;
            flex-wrap: wrap;
            gap: 14px 28px;
        }

        .banner-meta .meta-item {
            font-size: 14px;
            color: var(--color-muted);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .banner-meta .meta-item strong {
            color: var(--color-ink);
            font-weight: 600;
            font-family: var(--font-latin);
            font-size: 15px;
        }

        .anchor-badges {
            margin-top: 32px;
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }

        .anchor-badges .badge-anchor {
            display: inline-block;
            padding: 8px 18px;
            border: 1px solid var(--color-line);
            border-radius: 32px;
            font-size: 14px;
            font-weight: 500;
            color: var(--color-muted);
            background-color: var(--color-panel);
            transition: all 0.25s ease;
        }

        .anchor-badges .badge-anchor:hover {
            border-color: var(--color-ink);
            color: var(--color-ink);
            transform: translateY(-2px);
        }

        /* ============================================
           分类页2 主体 — 左右分栏索引布局
        ============================================ */
        .insight-layout {
            display: flex;
            gap: 48px;
            align-items: flex-start;
        }

        .sidebar-index {
            width: 280px;
            flex-shrink: 0;
            position: sticky;
            top: 100px;
            padding-top: 8px;
        }

        .sidebar-index .index-label {
            font-size: 13px;
            font-weight: 600;
            color: var(--color-muted);
            letter-spacing: 0.08em;
            margin-bottom: 16px;
            display: block;
            text-transform: uppercase;
            font-family: var(--font-latin);
        }

        .sidebar-index .index-list {
            border-left: 1px solid var(--color-line);
        }

        .sidebar-index .index-item {
            display: block;
            padding: 10px 16px;
            font-size: 14px;
            font-weight: 500;
            color: var(--color-muted);
            border-left: 2px solid transparent;
            margin-left: -1px;
            transition: all 0.3s ease;
            line-height: 1.5;
        }

        .sidebar-index .index-item:hover {
            color: var(--color-ink);
            border-left-color: var(--color-signal);
            padding-left: 20px;
        }

        .sidebar-index .index-item.active {
            color: var(--color-ink);
            border-left-color: var(--color-signal);
            font-weight: 600;
            background-color: rgba(195, 233, 52, 0.06);
        }

        .insight-content-area {
            flex: 1;
            min-width: 0;
        }

        .insight-block {
            margin-bottom: 60px;
            scroll-margin-top: 100px;
        }

        .insight-block:last-child {
            margin-bottom: 0;
        }

        .insight-block-head {
            display: flex;
            align-items: baseline;
            gap: 12px;
            margin-bottom: 24px;
        }

        .insight-block-index {
            font-family: var(--font-latin);
            font-weight: 800;
            font-size: 20px;
            color: var(--color-signal);
        }

        .insight-block-title {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--color-ink);
        }

        .insight-item {
            display: flex;
            gap: 24px;
            background-color: var(--color-panel);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-lg);
            padding: 20px;
            margin-bottom: 16px;
            transition: var(--transition-base);
            align-items: flex-start;
        }

        .insight-item:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
            border-color: rgba(21, 24, 26, 0.15);
        }

        .insight-item-img {
            width: 180px;
            height: 130px;
            flex-shrink: 0;
            object-fit: cover;
            border-radius: var(--radius-md);
            background-color: #E8E6DF;
        }

        .insight-item-body {
            flex: 1;
            min-width: 0;
        }

        .insight-item-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 6px;
            font-size: 12px;
            color: var(--color-muted);
        }

        .insight-item-meta .dot {
            width: 4px;
            height: 4px;
            background: var(--color-muted);
            border-radius: 50%;
            display: inline-block;
        }

        .insight-item-meta .tag-chip {
            color: var(--color-ink);
            font-weight: 500;
            background: rgba(195, 233, 52, 0.3);
            padding: 2px 10px;
            border-radius: 3px;
            font-size: 12px;
        }

        .insight-item-title {
            font-size: 18px;
            font-weight: 600;
            line-height: 1.5;
            margin-bottom: 6px;
            color: var(--color-ink);
            transition: color 0.2s;
        }

        .insight-item:hover .insight-item-title {
            color: #3A3F42;
        }

        .insight-item-desc {
            font-size: 14px;
            color: var(--color-muted);
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        /* 深入观察展示组 */
        .deep-view-card {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
            margin-top: 24px;
        }

        .deep-view-item {
            background-color: var(--color-panel);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: var(--transition-base);
        }

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

        .deep-view-item .image-wrapper {
            height: 180px;
            overflow: hidden;
            background-color: #E8E6DF;
        }

        .deep-view-item .image-wrapper img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .deep-view-item:hover .image-wrapper img {
            transform: scale(1.05);
        }

        .deep-view-item .content-wrap {
            padding: 20px 24px 24px;
        }

        .deep-view-item .title {
            font-size: 17px;
            font-weight: 600;
            margin-bottom: 8px;
            line-height: 1.5;
        }

        .deep-view-item .desc {
            font-size: 14px;
            color: var(--color-muted);
            line-height: 1.7;
            margin-bottom: 16px;
        }

        .read-more-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-ink);
        }

        .read-more-link .arrow {
            transition: transform 0.3s ease;
        }

        .read-more-link:hover .arrow {
            transform: translateX(4px);
        }

        .deep-view-item:nth-child(2n) .content-wrap {
            position: relative;
        }

        /* ============================================
           分类内 CTA 通栏横幅
        ============================================ */
        .banner-cta-block {
            background-color: var(--color-ink);
            border-radius: var(--radius-lg);
            padding: 48px 48px;
            margin: 48px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
            flex-wrap: wrap;
        }

        .banner-cta-left .cta-title {
            color: var(--color-paper);
            font-size: 24px;
            font-weight: 700;
            line-height: 1.4;
            margin-bottom: 8px;
        }

        .banner-cta-left .cta-desc {
            color: rgba(255, 255, 255, 0.6);
            font-size: 15px;
            line-height: 1.7;
        }

        .banner-cta-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: var(--color-signal);
            color: var(--color-ink);
            font-weight: 600;
            font-size: 15px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            transition: var(--transition-base);
            flex-shrink: 0;
        }

        .banner-cta-link:hover {
            background-color: #D4F84E;
            transform: translateY(-2px);
            color: var(--color-ink);
            box-shadow: 0 8px 20px rgba(195, 233, 52, 0.2);
        }

        .banner-cta-link .arrow {
            transition: transform 0.3s;
        }

        .banner-cta-link:hover .arrow {
            transform: translateX(3px);
        }

        /* ============================================
           FAQ 折叠组件 — Bootstap 5 定制
        ============================================ */
        .faq-section {
            padding: clamp(40px, 5vw, 64px) 0;
            background-color: var(--color-paper);
            border-top: 1px solid var(--color-line);
        }

        .faq-title-wrap {
            margin-bottom: 32px;
        }

        .accordion-custom .accordion-item {
            background-color: transparent;
            border: none;
            border-bottom: 1px solid var(--color-line);
            border-radius: 0 !important;
        }

        .accordion-custom .accordion-item:first-child {
            border-top: 1px solid var(--color-line);
        }

        .accordion-custom .accordion-button {
            background-color: transparent;
            box-shadow: none;
            font-size: 16px;
            font-weight: 600;
            color: var(--color-ink);
            padding: 20px 8px;
            border: none;
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .accordion-custom .accordion-button::after {
            background: none;
            content: '+';
            font-family: var(--font-latin);
            font-size: 24px;
            font-weight: 400;
            color: var(--color-muted);
            transition: transform 0.3s ease;
            position: absolute;
            right: 16px;
        }

        .accordion-custom .accordion-button:not(.collapsed)::after {
            transform: rotate(45deg);
            color: var(--color-ink);
        }

        .accordion-custom .accordion-button:not(.collapsed) {
            color: var(--color-ink);
            background-color: transparent;
            box-shadow: none;
        }

        .accordion-custom .accordion-button:focus {
            box-shadow: none;
            border-color: transparent;
        }

        .accordion-custom .accordion-button:hover {
            background-color: rgba(21, 24, 26, 0.02);
        }

        .accordion-custom .accordion-body {
            padding: 0 8px 24px;
            font-size: 15px;
            color: var(--color-muted);
            line-height: 1.8;
        }

        .accordion-custom .accordion-body a {
            color: var(--color-ink);
            font-weight: 500;
            text-decoration: underline;
        }

        /* CTA 转化条 */
        .convert-bar {
            background-color: var(--color-panel);
            border: 1px solid var(--color-line);
            border-radius: var(--radius-lg);
            padding: 28px 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-wrap: wrap;
            gap: 16px;
            text-align: center;
            margin-top: 12px;
        }

        .convert-bar .text {
            font-size: 16px;
            color: var(--color-ink);
            font-weight: 500;
        }

        .convert-bar a {
            color: var(--color-ink);
            font-weight: 700;
            text-decoration: underline;
            text-underline-offset: 4px;
        }

        .convert-bar a:hover {
            color: #3A3F42;
        }

        /* ============================================
           Footer 页脚
        ============================================ */
        .footer {
            background-color: var(--color-deep);
            color: rgba(255, 255, 255, 0.7);
            padding-top: 72px;
            padding-bottom: 32px;
            margin-top: 0;
        }

        .footer .brand-area {
            margin-bottom: 8px;
        }

        .footer .footer-brand {
            font-size: 20px;
            font-weight: 800;
            color: var(--color-paper);
            display: block;
            margin-bottom: 12px;
            letter-spacing: 0.02em;
        }

        .footer p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            max-width: 320px;
        }

        .footer h4 {
            font-size: 14px;
            font-weight: 600;
            color: rgba(255, 255, 255, 0.4);
            margin-bottom: 18px;
            letter-spacing: 0.08em;
        }

        .footer ul li {
            margin-bottom: 10px;
        }

        .footer ul li a {
            color: rgba(255, 255, 255, 0.72);
            font-size: 15px;
            transition: color 0.3s ease;
        }

        .footer ul li a:hover {
            color: var(--color-paper);
            text-decoration: none;
        }

        .footer .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 28px;
            margin-top: 48px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
        }

        /* ============================================
           滚动展示动画
        ============================================ */
        .reveal {
            opacity: 1;
            transform: translateY(0);
            transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1), transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
        }

        .reveal.is-hidden {
            opacity: 0;
            transform: translateY(20px);
        }

        @media (prefers-reduced-motion: reduce) {
            *,
            *::before,
            *::after {
                transition-duration: 0.01ms !important;
                animation-duration: 0.01ms !important;
                scroll-behavior: auto !important;
            }
            .reveal.is-hidden {
                opacity: 1;
                transform: none;
            }
        }

        /* ============================================
           响应式断点
        ============================================ */
        @media (max-width: 991px) {
            .desktop {
                display: none;
            }

            .navbar-desktop {
                display: flex;
                align-items: center;
                padding: 0 16px;
            }

            .site-header {
                height: 64px;
            }

            .navbar-desktop {
                height: 64px;
            }

            .navbar-brand-title {
                position: relative;
                left: auto;
                transform: none;
                font-size: 16px;
                text-align: center;
                flex: 1;
                justify-content: center;
            }

            .mobile-hamburger {
                display: flex;
                order: -1;
            }

            .mobile-menu {
                top: 64px;
            }

            .insight-layout {
                flex-direction: column;
                gap: 32px;
            }

            .sidebar-index {
                width: 100%;
                position: relative;
                top: auto;
                border-bottom: 1px solid var(--color-line);
                padding-bottom: 16px;
            }

            .sidebar-index .index-list {
                display: flex;
                border-left: none;
                flex-wrap: wrap;
                width: 100%;
            }

            .sidebar-index .index-item {
                border-left: none;
                border-bottom: 1px solid transparent;
                margin-left: 0;
                padding: 8px 12px;
                margin-right: 8px;
                border-radius: 4px;
            }

            .sidebar-index .index-item:hover {
                border-left-width: 2px;
                background: rgba(195, 233, 52, 0.08);
            }

            .sidebar-index .index-label {
                margin-bottom: 8px;
            }
        }

        @media (max-width: 767px) {
            .container-custom,
            .container-narrow {
                padding-left: 20px;
                padding-right: 20px;
            }

            .category-banner {
                min-height: 300px;
                padding: 50px 0 40px;
            }

            .category-banner h1 {
                font-size: 2rem;
            }

            .insight-item {
                flex-direction: column;
            }

            .insight-item-img {
                width: 100%;
                height: 180px;
            }

            .deep-view-card {
                grid-template-columns: 1fr;
            }

            .banner-cta-block {
                padding: 32px 24px;
            }

            .footer .footer-bottom {
                flex-direction: column;
                gap: 8px;
                text-align: center;
            }
        }

        @media (max-width: 575px) {
            .navbar-brand-title {
                font-size: 14px;
                gap: 4px;
            }

            .navbar-brand-title .brand-mark {
                width: 16px;
                height: 16px;
            }

            .navbar-brand-title .brand-mark::before {
                width: 12px;
                height: 12px;
                border-width: 2px;
                top: 5px;
                left: 2px;
            }

            .section-title {
                font-size: 1.6rem;
            }

            .insight-item-title {
                font-size: 16px;
            }

            .eyebrow {
                flex-wrap: wrap;
            }
        }