/* roulang page: index */
:root {
      --ink: #202b36;
      --muted: #63717e;
      --blue: #1769aa;
      --blue-deep: #104b7a;
      --teal: #197c78;
      --coral: #ca674e;
      --paper: #ffffff;
      --wash: #f3f7f9;
      --wash-blue: #eaf3f8;
      --line: #dce5eb;
      --radius: 7px;
      --shadow: 0 8px 26px rgba(25, 54, 77, .075);
      --sidebar: 254px;
      --content: 1320px;
    }
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 24px; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      font-size: 16px;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    img { display: block; max-width: 100%; }
    a { color: var(--blue); text-decoration: none; transition: color .18s ease, background-color .18s ease, border-color .18s ease, box-shadow .18s ease; }
    a:hover { color: var(--blue-deep); }
    a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible { outline: 3px solid rgba(23,105,170,.32); outline-offset: 3px; }
    button, input, textarea { font: inherit; }
    p { margin: 0 0 1rem; }
    h1, h2, h3, h4 { color: var(--ink); font-weight: 700; line-height: 1.25; margin: 0 0 .8rem; }
    h1 { font-size: 48px; }
    h2 { font-size: 31px; }
    h3 { font-size: 19px; }
    .site-shell { min-height: 100vh; }
    .sidebar {
      position: fixed; inset: 0 auto 0 0; z-index: 20; width: var(--sidebar);
      padding: 27px 19px 20px; background: #fff; border-right: 1px solid var(--line);
      display: flex; flex-direction: column;
    }
    .brand { display: flex; align-items: flex-start; gap: 11px; padding: 3px 5px 28px; color: var(--ink); }
    .brand-mark {
      width: 36px; height: 36px; flex: 0 0 36px; display: grid; place-items: center;
      color: #fff; background: var(--blue); border-radius: 6px; font-size: 17px; font-weight: 800;
    }
    .brand-name { font-size: 16px; font-weight: 750; line-height: 1.45; overflow-wrap: anywhere; }
    .nav-label { margin: 8px 10px 10px; color: #8996a1; font-size: 11px; font-weight: 700; letter-spacing: 0; }
    .side-nav { display: grid; gap: 5px; }
    .side-nav a {
      display: flex; align-items: center; gap: 12px; min-height: 45px; padding: 9px 11px;
      color: #536271; border-radius: 5px; font-size: 14px; font-weight: 600;
    }
    .side-nav a:hover { color: var(--blue-deep); background: #f2f7fa; }
    .side-nav a[aria-current="page"] { color: var(--blue-deep); background: #eaf3f8; }
    .nav-icon { width: 19px; text-align: center; font-size: 17px; line-height: 1; }
    .sidebar-note { margin-top: auto; padding: 15px 12px; color: var(--muted); background: var(--wash); border-left: 3px solid var(--teal); font-size: 12px; line-height: 1.65; }
    .sidebar-note strong { display: block; color: var(--ink); font-size: 13px; margin-bottom: 3px; }
    .mobile-bar { display: none; }
    .main-wrap { margin-left: var(--sidebar); min-width: 0; }
    main { overflow: hidden; }
    .container { max-width: var(--content); padding-left: 54px; padding-right: 54px; margin: 0 auto; }
    .section { padding: 82px 0; }
    .section-tint { background: var(--wash); }
    .section-blue { background: var(--wash-blue); }
    .section-head { display: flex; justify-content: space-between; align-items: end; gap: 30px; margin-bottom: 34px; }
    .section-head > div { max-width: 740px; }
    .eyebrow { color: var(--teal); font-size: 12px; font-weight: 750; margin-bottom: 10px; }
    .section-head p { max-width: 720px; margin: 0; color: var(--muted); }
    .hero {
      min-height: 640px; position: relative; display: flex; align-items: center; color: #fff;
      background: #263e4c url("https://images.unsplash.com/photo-1519501025264-65ba15a82390?auto=format&fit=crop&w=2000&q=88") center 47% / cover no-repeat;
    }
    .hero::before { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(17,35,48,.83) 0%, rgba(17,35,48,.58) 48%, rgba(17,35,48,.12) 100%); }
    .hero-content { position: relative; z-index: 1; width: 100%; padding-top: 70px; padding-bottom: 70px; }
    .hero-kicker { display: inline-flex; gap: 9px; align-items: center; margin-bottom: 20px; color: #d7e8f0; font-size: 13px; font-weight: 650; }
    .hero-kicker::before { content: ""; width: 25px; height: 2px; background: #75c7bd; }
    .hero h1 { max-width: 700px; margin-bottom: 19px; color: #fff; font-size: 50px; }
    .hero-copy { max-width: 690px; margin-bottom: 28px; color: #e4edf1; font-size: 17px; line-height: 1.9; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
    .button {
      display: inline-flex; justify-content: center; align-items: center; min-height: 47px; padding: 11px 20px;
      border: 1px solid var(--blue); border-radius: 4px; background: var(--blue); color: #fff;
      font-size: 14px; font-weight: 700; line-height: 1.3; cursor: pointer;
    }
    .button:hover { color: #fff; background: var(--blue-deep); border-color: var(--blue-deep); box-shadow: 0 5px 14px rgba(16,75,122,.18); }
    .button:active { transform: translateY(1px); }
    .button-outline { color: #fff; background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.66); }
    .button-outline:hover { background: rgba(255,255,255,.18); border-color: #fff; }
    .hero-caption { position: absolute; right: 24px; bottom: 20px; z-index: 1; color: rgba(255,255,255,.78); font-size: 11px; }
    .intro-strip { display: grid; grid-template-columns: 1.1fr 2fr; gap: 36px; align-items: center; padding-top: 44px; padding-bottom: 44px; }
    .intro-strip h2 { margin: 0; font-size: 22px; }
    .intro-strip p { margin: 0; color: var(--muted); }
    .topic-layout { display: grid; grid-template-columns: 1.1fr .9fr; gap: 35px; align-items: center; }
    .topic-photo { min-height: 340px; overflow: hidden; border-radius: var(--radius); box-shadow: var(--shadow); }
    .topic-photo img { width: 100%; height: 100%; min-height: 340px; object-fit: cover; }
    .topic-copy p { color: var(--muted); }
    .topic-points { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 18px; padding: 16px 0 0; margin: 0; list-style: none; border-top: 1px solid var(--line); }
    .topic-points li { color: #415260; font-size: 14px; }
    .topic-points li::before { content: "＋"; margin-right: 8px; color: var(--teal); font-weight: 800; }
    .matrix { display: grid; grid-template-columns: 1.1fr .9fr; gap: 50px; align-items: start; }
    .matrix-lead { padding-top: 6px; }
    .matrix-lead p { max-width: 580px; color: var(--muted); }
    .matrix-list { border-top: 1px solid var(--line); }
    .matrix-item { display: grid; grid-template-columns: 52px 1fr; gap: 14px; padding: 19px 0; border-bottom: 1px solid var(--line); }
    .matrix-number { color: var(--teal); font-size: 12px; font-weight: 800; padding-top: 3px; }
    .matrix-item h3 { margin-bottom: 5px; font-size: 17px; }
    .matrix-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .metric-band { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
    .metric { padding: 23px 20px 22px 0; }
    .metric + .metric { padding-left: 24px; border-left: 1px solid var(--line); }
    .metric strong { display: block; margin-bottom: 4px; color: var(--blue-deep); font-size: 19px; }
    .metric span { color: var(--muted); font-size: 13px; }
    .steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; counter-reset: steps; }
    .step { position: relative; min-height: 176px; padding: 21px 20px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 4px 16px rgba(25,54,77,.045); counter-increment: steps; }
    .step::before { content: "0" counter(steps); display: block; margin-bottom: 24px; color: var(--teal); font-size: 12px; font-weight: 800; }
    .step h3 { font-size: 17px; }
    .step p { margin: 0; color: var(--muted); font-size: 13px; }
    .case-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 20px; }
    .case { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
    .case-image { aspect-ratio: 16 / 10; overflow: hidden; background: #dbe7eb; }
    .case-image img { width: 100%; height: 100%; object-fit: cover; transition: transform .35s ease; }
    .case:hover .case-image img { transform: scale(1.035); }
    .case-body { padding: 19px 19px 21px; }
    .tag { display: inline-block; margin-bottom: 10px; padding: 3px 8px; color: var(--teal); background: #e8f4f1; border-radius: 3px; font-size: 11px; font-weight: 700; }
    .case h3 { margin-bottom: 7px; }
    .case p { margin: 0; color: var(--muted); font-size: 13px; }
    .feature-story { display: grid; grid-template-columns: .85fr 1.15fr; gap: 36px; align-items: center; }
    .feature-story figure { margin: 0; overflow: hidden; border-radius: var(--radius); }
    .feature-story figure img { width: 100%; height: 310px; object-fit: cover; }
    .feature-story .story-copy p { color: var(--muted); }
    .text-link { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; font-size: 14px; }
    .editorial-list { border-top: 1px solid var(--line); }
    .editorial-item { display: grid; grid-template-columns: 115px 1fr 20px; gap: 22px; align-items: center; padding: 19px 0; border-bottom: 1px solid var(--line); color: var(--ink); }
    .editorial-item:hover { color: var(--blue-deep); }
    .editorial-meta { color: var(--teal); font-size: 12px; font-weight: 700; }
    .editorial-item h3 { margin: 0 0 4px; font-size: 16px; }
    .editorial-item p { margin: 0; color: var(--muted); font-size: 13px; }
    .editorial-arrow { color: var(--blue); font-size: 19px; }
    .source-band { display: grid; grid-template-columns: .9fr 1.1fr; gap: 55px; align-items: center; }
    .source-band p { margin: 0; color: var(--muted); }
    .source-tags { display: flex; flex-wrap: wrap; gap: 9px; }
    .source-tags span { padding: 9px 13px; border: 1px solid #cedde3; border-radius: 4px; color: #405260; background: #fff; font-size: 13px; }
    .faq-list { max-width: 900px; border-top: 1px solid var(--line); }
    .faq-item { border-bottom: 1px solid var(--line); }
    .faq-item summary { position: relative; padding: 19px 36px 19px 0; cursor: pointer; color: var(--ink); font-weight: 700; list-style: none; }
    .faq-item summary::-webkit-details-marker { display: none; }
    .faq-item summary::after { content: "+"; position: absolute; right: 5px; top: 13px; color: var(--blue); font-size: 23px; font-weight: 400; }
    .faq-item[open] summary::after { content: "−"; }
    .faq-item p { max-width: 800px; padding: 0 30px 18px 0; margin: 0; color: var(--muted); font-size: 14px; }
    .assurance { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
    .assurance-item { display: grid; grid-template-columns: 33px 1fr; gap: 12px; align-items: start; }
    .assurance-mark { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; color: var(--teal); background: #dff0ec; font-weight: 800; font-size: 14px; }
    .assurance-item strong { display: block; margin-bottom: 3px; font-size: 14px; }
    .assurance-item span { display: block; color: var(--muted); font-size: 12px; line-height: 1.6; }
    .contact-band { background: #173d59; color: #fff; }
    .contact-inner { display: grid; grid-template-columns: 1.2fr .8fr; gap: 40px; align-items: center; }
    .contact-band h2 { color: #fff; }
    .contact-band p { max-width: 650px; margin: 0; color: #d2e0e8; }
    .contact-actions { display: flex; justify-content: flex-end; flex-wrap: wrap; gap: 11px; }
    .contact-actions .button { background: #fff; color: var(--blue-deep); border-color: #fff; }
    .contact-actions .button:hover { background: #eaf3f8; }
    .contact-actions .button-outline { color: #fff; background: transparent; border-color: rgba(255,255,255,.55); }
    .site-footer { padding: 45px 0 24px; background: #f6f8f9; border-top: 1px solid var(--line); }
    .footer-top { display: grid; grid-template-columns: 1.4fr .8fr .8fr; gap: 45px; padding-bottom: 30px; }
    .footer-brand { display: inline-block; margin-bottom: 10px; color: var(--ink); font-size: 18px; font-weight: 750; }
    .footer-top p { max-width: 390px; color: var(--muted); font-size: 13px; }
    .footer-col h3 { margin-bottom: 12px; font-size: 13px; }
    .footer-col a { display: block; width: fit-content; margin: 6px 0; color: var(--muted); font-size: 13px; }
    .footer-col a:hover { color: var(--blue); }
    .copyright { display: flex; justify-content: space-between; gap: 15px; padding-top: 18px; border-top: 1px solid var(--line); color: #778590; font-size: 11px; }
    .category-page .section { padding-top: 60px; padding-bottom: 60px; }
    .breadcrumb { margin-bottom: 22px; color: #82909a; font-size: 12px; }
    .breadcrumb a { color: var(--blue); }
    .category-heading { max-width: 850px; }
    .category-heading h1 { margin-bottom: 12px; font-size: 42px; }
    .category-heading p { color: var(--muted); }
    .category-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 38px; align-items: center; }
    .category-intro img { width: 100%; height: 285px; object-fit: cover; border-radius: var(--radius); }
    .index-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
    .index-item { display: flex; justify-content: space-between; gap: 15px; padding: 16px 17px; color: var(--ink); background: #fff; border: 1px solid var(--line); border-radius: 5px; font-size: 14px; font-weight: 650; }
    .index-item span:last-child { color: var(--teal); }
    .category-article-list { border-top: 1px solid var(--line); }
    .category-article { display: grid; grid-template-columns: 180px 1fr; gap: 23px; padding: 22px 0; border-bottom: 1px solid var(--line); }
    .category-article img { width: 180px; height: 118px; object-fit: cover; border-radius: 4px; }
    .category-article h3 { margin: 4px 0 7px; }
    .category-article p { margin: 0; color: var(--muted); font-size: 14px; }
    .category-article .tag { margin: 0; }
    .read-more { display: inline-block; margin-top: 9px; font-size: 13px; font-weight: 700; }
    .related-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 45px; }
    .related-columns h3 { font-size: 17px; }
    .related-columns p { color: var(--muted); font-size: 14px; }
    .category-cta { display: flex; justify-content: space-between; align-items: center; gap: 28px; padding: 30px; background: #eaf3f8; border-left: 4px solid var(--blue); }
    .category-cta h2 { margin-bottom: 6px; font-size: 23px; }
    .category-cta p { margin: 0; color: var(--muted); }
    @media (max-width: 1199px) {
      :root { --sidebar: 220px; }
      .container { padding-left: 38px; padding-right: 38px; }
      .hero { min-height: 590px; }
      .case-grid { gap: 14px; }
      .assurance { gap: 15px; }
    }
    @media (max-width: 1023px) {
      :root { --sidebar: 195px; }
      .sidebar { padding-left: 13px; padding-right: 13px; }
      .container { padding-left: 30px; padding-right: 30px; }
      .hero h1 { font-size: 43px; }
      .section { padding: 65px 0; }
      .steps { grid-template-columns: repeat(2, 1fr); }
      .assurance { grid-template-columns: repeat(2, 1fr); }
      .case-grid { grid-template-columns: repeat(2, 1fr); }
      .case:first-child { grid-column: span 2; }
    }
    @media (max-width: 767px) {
      .sidebar { display: none; }
      .mobile-bar {
        position: sticky; top: 0; z-index: 30; display: flex; justify-content: space-between; align-items: center;
        min-height: 58px; padding: 8px 18px; background: rgba(255,255,255,.97); border-bottom: 1px solid var(--line);
      }
      .mobile-brand { display: flex; align-items: center; gap: 9px; color: var(--ink); font-weight: 750; font-size: 14px; }
      .mobile-brand .brand-mark { width: 31px; height: 31px; flex-basis: 31px; font-size: 15px; }
      .menu-toggle { min-width: 42px; min-height: 42px; border: 1px solid var(--line); border-radius: 4px; color: var(--ink); background: #fff; font-size: 20px; cursor: pointer; }
      .mobile-menu { display: none; position: absolute; top: 58px; left: 0; right: 0; padding: 8px 18px 14px; background: #fff; border-bottom: 1px solid var(--line); box-shadow: var(--shadow); }
      .mobile-menu.is-open { display: grid; }
      .mobile-menu a { padding: 11px 8px; color: var(--ink); border-bottom: 1px solid #edf1f3; font-size: 14px; }
      .mobile-menu a[aria-current="page"] { color: var(--blue); font-weight: 750; }
      .main-wrap { margin-left: 0; }
      .container { padding-left: 22px; padding-right: 22px; }
      .section { padding: 55px 0; }
      h2 { font-size: 27px; }
      .hero { min-height: 605px; background-position: 56% center; }
      .hero::before { background: linear-gradient(90deg, rgba(17,35,48,.83), rgba(17,35,48,.50)); }
      .hero-content { padding-top: 54px; padding-bottom: 65px; }
      .hero h1 { max-width: 560px; font-size: 38px; }
      .hero-copy { font-size: 15px; }
      .hero-caption { right: 17px; bottom: 12px; }
      .intro-strip, .topic-layout, .matrix, .feature-story, .source-band, .contact-inner, .category-intro { grid-template-columns: 1fr; gap: 23px; }
      .intro-strip { padding-top: 32px; padding-bottom: 32px; }
      .section-head { display: block; margin-bottom: 25px; }
      .section-head p { margin-top: 9px; }
      .topic-photo, .topic-photo img { min-height: 250px; height: 250px; }
      .metric-band { grid-template-columns: repeat(2, 1fr); }
      .metric { padding: 17px 10px 17px 0; }
      .metric + .metric { padding-left: 15px; }
      .metric:nth-child(3) { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
      .metric:nth-child(4) { border-top: 1px solid var(--line); }
      .steps { gap: 12px; }
      .step { min-height: 165px; padding: 17px 15px; }
      .case-grid { grid-template-columns: 1fr; }
      .case:first-child { grid-column: auto; }
      .feature-story figure img { height: 245px; }
      .editorial-item { grid-template-columns: 82px 1fr 14px; gap: 12px; }
      .editorial-item p { display: none; }
      .source-band { gap: 20px; }
      .contact-actions { justify-content: flex-start; }
      .footer-top { grid-template-columns: 1fr 1fr; gap: 26px; }
      .footer-top > div:first-child { grid-column: span 2; }
      .copyright { display: block; }
      .copyright span { display: block; margin-top: 4px; }
      .category-page .section { padding-top: 42px; padding-bottom: 42px; }
      .category-heading h1 { font-size: 35px; }
      .category-intro img { height: 230px; }
      .index-list { grid-template-columns: repeat(2, 1fr); }
      .category-article { grid-template-columns: 112px 1fr; gap: 14px; }
      .category-article img { width: 112px; height: 96px; }
      .related-columns { grid-template-columns: 1fr; gap: 15px; }
      .category-cta { align-items: flex-start; flex-direction: column; padding: 22px; }
    }
    @media (max-width: 519px) {
      body { font-size: 15px; }
      .container { padding-left: 18px; padding-right: 18px; }
      .hero { min-height: 630px; }
      .hero h1 { font-size: 34px; }
      .hero-copy { font-size: 14px; line-height: 1.8; }
      .hero-actions { align-items: stretch; flex-direction: column; max-width: 245px; }
      .topic-points { grid-template-columns: 1fr; }
      .steps { grid-template-columns: 1fr; }
      .step { min-height: 0; }
      .step::before { margin-bottom: 12px; }
      .assurance { grid-template-columns: 1fr; }
      .editorial-item { grid-template-columns: 1fr 16px; gap: 8px; }
      .editorial-meta { grid-column: 1; }
      .editorial-item > div:nth-child(2) { grid-column: 1; }
      .editorial-arrow { grid-column: 2; grid-row: 1 / span 2; }
      .footer-top { grid-template-columns: 1fr 1fr; gap: 22px 16px; }
      .footer-top > div:first-child { grid-column: span 2; }
      .category-heading h1 { font-size: 31px; }
      .index-list { grid-template-columns: 1fr; }
      .category-article { grid-template-columns: 1fr; }
      .category-article img { width: 100%; height: 185px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
    }

/* roulang page: category1 */
:root {
            --ink: #202b36;
            --muted: #63717e;
            --blue: #1769aa;
            --blue-deep: #104b7a;
            --teal: #197c78;
            --coral: #ca674e;
            --paper: #ffffff;
            --wash: #f3f7f9;
            --wash-blue: #eaf3f8;
            --line: #dce5eb;
            --radius: 7px;
            --shadow: 0 8px 26px rgba(25, 54, 77, .075);
            --sidebar: 254px;
            --content: 1320px;
        }

        *, *::before, *::after { box-sizing: border-box; }
        html { scroll-behavior: smooth; scroll-padding-top: 24px; }
        body {
            margin: 0;
            color: var(--ink);
            background: var(--paper);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            font-size: 16px;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        img { display: block; max-width: 100%; }
        a { color: var(--blue); text-decoration: none; transition: color .18s ease, background-color .18s ease, border-color .18s ease, box-shadow .18s ease; }
        a:hover { color: var(--blue-deep); }
        a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, summary:focus-visible {
            outline: 3px solid rgba(23,105,170,.32);
            outline-offset: 3px;
        }
        button, input, textarea { font: inherit; }
        h1, h2, h3, p { overflow-wrap: anywhere; }
        h1, h2, h3 { color: var(--ink); line-height: 1.3; }
        .container { width: 100%; max-width: var(--content); padding-left: 54px; padding-right: 54px; margin: 0 auto; }
        .sidebar {
            position: fixed; z-index: 20; inset: 0 auto 0 0; width: var(--sidebar);
            display: flex; flex-direction: column; padding: 28px 20px 22px;
            background: #fff; border-right: 1px solid var(--line);
        }
        .brand { display: flex; align-items: flex-start; gap: 11px; padding: 3px 5px 28px; color: var(--ink); }
        .brand:hover { color: var(--blue-deep); }
        .brand-mark {
            width: 36px; height: 36px; flex: 0 0 36px; display: grid; place-items: center;
            color: #fff; background: var(--blue); border-radius: 6px; font-size: 17px; font-weight: 800;
        }
        .brand-name { font-size: 16px; font-weight: 750; line-height: 1.45; overflow-wrap: anywhere; }
        .nav-label { margin: 8px 10px 10px; color: #8996a1; font-size: 11px; font-weight: 700; }
        .side-nav { display: grid; gap: 5px; }
        .side-nav a {
            display: flex; align-items: center; gap: 12px; min-height: 45px; padding: 9px 11px;
            color: #536271; border-radius: 5px; font-size: 14px; font-weight: 600;
        }
        .side-nav a:hover { color: var(--blue-deep); background: #f2f7fa; }
        .side-nav a[aria-current="page"] { color: var(--blue-deep); background: #eaf3f8; }
        .nav-icon { width: 19px; text-align: center; font-size: 17px; line-height: 1; }
        .sidebar-note { margin-top: auto; padding: 17px 13px; color: var(--muted); background: var(--wash); border-left: 3px solid var(--teal); font-size: 12px; line-height: 1.7; }
        .sidebar-note strong { display: block; margin-bottom: 4px; color: var(--ink); font-size: 13px; }
        .mobile-bar { display: none; }
        .main-wrap { min-width: 0; margin-left: var(--sidebar); }
        main { overflow: hidden; }
        .section { padding: 76px 0; }
        .section-tint { background: var(--wash); }
        .section-blue { background: var(--wash-blue); }
        .section-head { display: flex; justify-content: space-between; align-items: end; gap: 30px; margin-bottom: 32px; }
        .section-head > div { max-width: 740px; }
        .eyebrow { margin-bottom: 9px; color: var(--teal); font-size: 12px; font-weight: 750; }
        .section-head h2 { margin: 0 0 10px; font-size: 30px; font-weight: 750; }
        .section-head p { max-width: 720px; margin: 0; color: var(--muted); }
        .button {
            display: inline-flex; justify-content: center; align-items: center; min-height: 47px; padding: 11px 20px;
            border: 1px solid var(--blue); border-radius: 4px; background: var(--blue); color: #fff;
            font-size: 14px; font-weight: 700; line-height: 1.3; cursor: pointer;
        }
        .button:hover { color: #fff; background: var(--blue-deep); border-color: var(--blue-deep); box-shadow: 0 5px 14px rgba(16,75,122,.18); }
        .button:active { transform: translateY(1px); }
        .button-outline { color: var(--blue-deep); background: transparent; border-color: #94b3c8; }
        .button-outline:hover { color: #fff; background: var(--blue-deep); border-color: var(--blue-deep); }
        .text-link { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 700; }
        .hero {
            position: relative; min-height: 360px; display: flex; align-items: end; color: #fff;
            background: #28404d url("https://images.unsplash.com/photo-1519501025264-65ba15a82390?auto=format&fit=crop&w=1900&q=88") center 48% / cover no-repeat;
        }
        .hero::before { position: absolute; inset: 0; content: ""; background: linear-gradient(90deg, rgba(17,35,48,.82), rgba(17,35,48,.46) 60%, rgba(17,35,48,.18)); }
        .hero-content { position: relative; z-index: 1; width: 100%; padding-top: 64px; padding-bottom: 59px; }
        .hero-kicker { display: inline-flex; align-items: center; gap: 9px; margin-bottom: 14px; color: #d7e8f0; font-size: 13px; font-weight: 650; }
        .hero-kicker::before { width: 25px; height: 2px; background: #75c7bd; content: ""; }
        .hero h1 { max-width: 770px; margin: 0 0 15px; color: #fff; font-size: 43px; font-weight: 760; }
        .hero-copy { max-width: 720px; margin: 0; color: #e4edf1; font-size: 16px; line-height: 1.9; }
        .breadcrumb { display: flex; align-items: center; gap: 9px; margin: 0 0 22px; color: rgba(255,255,255,.8); font-size: 13px; }
        .breadcrumb a { color: #fff; }
        .breadcrumb span[aria-hidden="true"] { opacity: .65; }
        .intro-grid { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(240px, .8fr); gap: 56px; align-items: center; }
        .intro-copy h2 { max-width: 690px; margin: 0 0 17px; font-size: 31px; }
        .intro-copy p { max-width: 720px; margin: 0 0 13px; color: var(--muted); }
        .intro-aside { padding: 4px 0 4px 26px; border-left: 1px solid var(--line); }
        .intro-aside strong { display: block; margin-bottom: 7px; font-size: 15px; }
        .intro-aside p { margin: 0; color: var(--muted); font-size: 14px; }
        .topic-index { display: grid; grid-template-columns: 1fr 1fr; column-gap: 50px; border-top: 1px solid var(--line); }
        .topic-index a { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 19px 0; color: var(--ink); border-bottom: 1px solid var(--line); }
        .topic-index a:hover { color: var(--blue-deep); }
        .topic-index strong { font-size: 15px; }
        .topic-index small { display: block; color: var(--muted); font-size: 12px; font-weight: 400; }
        .topic-index .index-number { color: var(--teal); font-size: 12px; font-weight: 750; }
        .article-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 23px; }
        .article-card {
            min-width: 0; overflow: hidden; background: #fff; border: 1px solid var(--line);
            border-radius: var(--radius); box-shadow: 0 4px 18px rgba(25,54,77,.045);
            transition: box-shadow .2s ease, border-color .2s ease;
        }
        .article-card:hover { border-color: #b6cad7; box-shadow: var(--shadow); }
        .article-image { display: block; aspect-ratio: 16 / 8.8; overflow: hidden; background: #e7edf0; }
        .article-image img { width: 100%; height: 100%; object-fit: cover; transition: transform .35s ease; }
        .article-card:hover .article-image img { transform: scale(1.025); }
        .article-body { padding: 20px 22px 21px; }
        .tag { display: inline-block; margin-bottom: 9px; padding: 3px 8px; color: var(--teal); background: #e8f4f1; border-radius: 3px; font-size: 11px; font-weight: 700; }
        .article-body h3 { margin: 0 0 8px; font-size: 18px; }
        .article-body h3 a { color: var(--ink); }
        .article-body h3 a:hover { color: var(--blue); }
        .article-body p { min-height: 51px; margin: 0 0 15px; color: var(--muted); font-size: 14px; line-height: 1.75; }
        .article-meta { display: flex; justify-content: space-between; gap: 12px; padding-top: 12px; color: #71808c; border-top: 1px solid #edf1f3; font-size: 12px; }
        .more-row { display: flex; justify-content: flex-end; margin-top: 25px; }
        .feature-band { display: grid; grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr); gap: 44px; align-items: center; }
        .feature-photo { min-height: 340px; overflow: hidden; border-radius: var(--radius); background: #e5ecef; }
        .feature-photo img { width: 100%; height: 100%; min-height: 340px; object-fit: cover; }
        .feature-copy .tag { margin-bottom: 13px; }
        .feature-copy h2 { margin: 0 0 14px; font-size: 29px; }
        .feature-copy p { margin: 0 0 16px; color: var(--muted); }
        .feature-points { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 18px; margin: 20px 0 23px; padding: 0; list-style: none; }
        .feature-points li { display: flex; gap: 9px; align-items: flex-start; color: #435260; font-size: 13px; }
        .feature-points li::before { width: 7px; height: 7px; flex: 0 0 7px; margin-top: 9px; border-radius: 50%; background: var(--coral); content: ""; }
        .scene-grid { display: grid; grid-template-columns: 1.15fr .85fr .85fr; gap: 28px; align-items: start; }
        .scene-lead { padding-right: 18px; }
        .scene-lead h3 { margin: 0 0 12px; font-size: 22px; }
        .scene-lead p { margin: 0; color: var(--muted); }
        .scene-item { padding-top: 15px; border-top: 2px solid var(--teal); }
        .scene-item:nth-child(3) { border-color: var(--coral); }
        .scene-item h3 { margin: 0 0 9px; font-size: 16px; }
        .scene-item p { margin: 0; color: var(--muted); font-size: 13px; }
        .faq-list { max-width: 900px; border-top: 1px solid var(--line); }
        .faq-item { border-bottom: 1px solid var(--line); }
        .faq-item summary { position: relative; padding: 19px 38px 19px 0; color: var(--ink); font-weight: 700; cursor: pointer; list-style: none; }
        .faq-item summary::-webkit-details-marker { display: none; }
        .faq-item summary::after { position: absolute; top: 18px; right: 5px; color: var(--blue); content: "+"; font-size: 21px; font-weight: 400; }
        .faq-item[open] summary::after { content: "−"; }
        .faq-item p { max-width: 820px; margin: 0; padding: 0 35px 19px 0; color: var(--muted); font-size: 14px; }
        .assurance-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 25px; }
        .assurance-item { display: grid; grid-template-columns: 34px 1fr; gap: 13px; align-items: start; }
        .assurance-mark { display: grid; width: 32px; height: 32px; place-items: center; color: var(--teal); background: #e8f4f1; border-radius: 50%; font-size: 15px; font-weight: 800; }
        .assurance-item strong { display: block; margin: 1px 0 4px; font-size: 14px; }
        .assurance-item p { margin: 0; color: var(--muted); font-size: 12px; }
        .cta-band { display: flex; justify-content: space-between; align-items: center; gap: 30px; padding: 31px 34px; background: #edf4f7; border-left: 4px solid var(--blue); }
        .cta-band h2 { margin: 0 0 7px; font-size: 23px; }
        .cta-band p { margin: 0; color: var(--muted); font-size: 14px; }
        .site-footer { padding: 54px 0 20px; background: #f5f8fa; border-top: 1px solid var(--line); }
        .footer-top { display: grid; grid-template-columns: 1.6fr .7fr 1fr; gap: 50px; padding-bottom: 34px; }
        .footer-brand { display: inline-block; margin-bottom: 10px; color: var(--ink); font-size: 18px; font-weight: 800; }
        .footer-top p { max-width: 480px; margin: 0; color: var(--muted); font-size: 13px; }
        .footer-col h3 { margin: 2px 0 11px; font-size: 13px; }
        .footer-col a { display: block; width: fit-content; margin: 5px 0; color: #63717e; font-size: 12px; }
        .footer-col a:hover { color: var(--blue); }
        .copyright { display: flex; justify-content: space-between; gap: 18px; padding-top: 16px; color: #7b8791; border-top: 1px solid var(--line); font-size: 11px; }
        @media (max-width: 1100px) {
            :root { --sidebar: 220px; }
            .container { padding-left: 38px; padding-right: 38px; }
            .scene-grid { grid-template-columns: 1fr 1fr; }
            .scene-lead { grid-column: 1 / -1; }
        }
        @media (max-width: 820px) {
            :root { --sidebar: 195px; }
            .container { padding-left: 28px; padding-right: 28px; }
            .section { padding: 62px 0; }
            .hero { min-height: 350px; }
            .hero h1 { font-size: 37px; }
            .intro-grid { gap: 30px; }
            .feature-band { gap: 28px; }
            .footer-top { gap: 28px; }
        }
        @media (max-width: 680px) {
            :root { --sidebar: 0px; }
            .sidebar { display: none; }
            .mobile-bar {
                position: sticky; z-index: 30; top: 0; display: flex; align-items: center; justify-content: space-between;
                min-height: 62px; padding: 8px 18px; background: rgba(255,255,255,.97); border-bottom: 1px solid var(--line);
            }
            .mobile-brand { display: flex; align-items: center; gap: 9px; color: var(--ink); font-size: 13px; font-weight: 750; line-height: 1.3; }
            .mobile-brand .brand-mark { width: 32px; height: 32px; flex-basis: 32px; font-size: 15px; }
            .menu-toggle { width: 44px; height: 42px; color: var(--ink); background: #fff; border: 1px solid var(--line); border-radius: 5px; font-size: 21px; cursor: pointer; }
            .mobile-menu { display: none; position: absolute; top: 61px; left: 0; right: 0; padding: 10px 18px 16px; background: #fff; border-bottom: 1px solid var(--line); box-shadow: 0 8px 18px rgba(25,54,77,.08); }
            .mobile-menu.is-open { display: grid; gap: 5px; }
            .mobile-menu a { display: flex; gap: 11px; align-items: center; min-height: 44px; padding: 8px 11px; color: #536271; border-radius: 5px; font-size: 14px; font-weight: 650; }
            .mobile-menu a[aria-current="page"], .mobile-menu a:hover { color: var(--blue-deep); background: var(--wash-blue); }
            .main-wrap { margin-left: 0; }
            .container { padding-left: 21px; padding-right: 21px; }
            .section { padding: 51px 0; }
            .section-head { display: block; margin-bottom: 24px; }
            .section-head h2 { font-size: 25px; }
            .section-head p { font-size: 14px; }
            .hero { min-height: 380px; background-position: 57% center; }
            .hero-content { padding-top: 39px; padding-bottom: 40px; }
            .hero h1 { font-size: 33px; }
            .hero-copy { font-size: 14px; }
            .intro-grid, .feature-band { grid-template-columns: 1fr; gap: 25px; }
            .intro-copy h2, .feature-copy h2 { font-size: 25px; }
            .intro-aside { padding-left: 17px; }
            .topic-index { grid-template-columns: 1fr; }
            .article-list { grid-template-columns: 1fr; gap: 16px; }
            .article-body p { min-height: 0; }
            .feature-photo, .feature-photo img { min-height: 245px; height: 245px; }
            .scene-grid { grid-template-columns: 1fr; gap: 22px; }
            .scene-lead { grid-column: auto; padding-right: 0; }
            .assurance-row { grid-template-columns: 1fr; gap: 19px; }
            .cta-band { display: block; padding: 24px 20px; }
            .cta-band .button { margin-top: 17px; }
            .footer-top { grid-template-columns: 1fr 1fr; gap: 24px; }
            .footer-top > div:first-child { grid-column: 1 / -1; }
            .copyright { display: grid; gap: 5px; }
        }
        @media (max-width: 420px) {
            .container { padding-left: 17px; padding-right: 17px; }
            .hero h1 { font-size: 29px; }
            .feature-points { grid-template-columns: 1fr; }
            .footer-top { grid-template-columns: 1fr; }
            .footer-top > div:first-child { grid-column: auto; }
        }