/* roulang page: index */
:root {
      --ink: #172638;
      --muted: #607184;
      --faint: #8998a8;
      --paper: #f4f7fb;
      --white: #ffffff;
      --line: #e1e8ef;
      --blue: #176b91;
      --blue-dark: #105473;
      --teal: #31a78b;
      --gold: #c79a49;
      --gold-pale: #f7efdf;
      --radius: 14px;
      --radius-lg: 22px;
      --shadow: 0 14px 40px rgba(27, 52, 75, .08);
      --shadow-hover: 0 18px 46px rgba(27, 52, 75, .13);
      --container: 1160px;
    }

    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      background: var(--paper);
      color: var(--ink);
      font-family: Inter, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      font-size: 15px;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    a { color: inherit; text-decoration: none; }
    button, input { font: inherit; }
    button, a { -webkit-tap-highlight-color: transparent; }
    button:focus-visible, a:focus-visible, input:focus-visible {
      outline: 3px solid rgba(49, 167, 139, .48);
      outline-offset: 3px;
    }
    img { display: block; max-width: 100%; }
    .container { width: min(var(--container), calc(100% - 48px)); margin-inline: auto; }
    .site-header {
      position: sticky;
      z-index: 30;
      top: 0;
      background: rgba(255, 255, 255, .94);
      border-bottom: 1px solid rgba(225, 232, 239, .9);
      backdrop-filter: blur(14px);
    }
    .brand-row {
      min-height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }
    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      min-width: 0;
      color: var(--ink);
      font-weight: 800;
      font-size: 17px;
      line-height: 1.25;
    }
    .brand-mark {
      width: 38px;
      height: 38px;
      display: grid;
      place-items: center;
      flex: 0 0 auto;
      border-radius: 12px;
      color: #fff;
      background: linear-gradient(145deg, #176b91, #31a78b);
      box-shadow: 0 7px 16px rgba(23, 107, 145, .2);
    }
    .brand-mark svg { width: 20px; height: 20px; }
    .header-note {
      color: var(--muted);
      font-size: 13px;
      white-space: nowrap;
    }
    .nav-wrap {
      border-top: 1px solid #f0f3f6;
      overflow: hidden;
    }
    .nav-scroll {
      display: flex;
      gap: 9px;
      padding: 11px 0 12px;
      overflow-x: auto;
      scrollbar-width: none;
    }
    .nav-scroll::-webkit-scrollbar { display: none; }
    .nav-chip {
      min-height: 36px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      flex: 0 0 auto;
      padding: 0 15px;
      border: 1px solid transparent;
      border-radius: 999px;
      color: #506477;
      font-size: 13px;
      font-weight: 650;
      transition: color .2s ease, background .2s ease, border-color .2s ease;
    }
    .nav-chip:hover { color: var(--blue); background: #f0f7fa; }
    .nav-chip.is-active { color: var(--blue-dark); background: #eaf4f7; border-color: #d2e6ec; }
    .nav-chip.nav-cta {
      margin-left: auto;
      color: #fff;
      background: var(--blue);
      box-shadow: 0 5px 13px rgba(23, 107, 145, .16);
    }
    .nav-chip.nav-cta:hover { background: var(--blue-dark); }

    .hero {
      position: relative;
      overflow: hidden;
      padding: 54px 0 48px;
      color: #fff;
      background:
        radial-gradient(ellipse at 82% 20%, rgba(199, 154, 73, .21), transparent 28%),
        linear-gradient(112deg, #142638 0%, #183c50 56%, #155d6b 100%);
    }
    .hero::after {
      position: absolute;
      right: -90px;
      bottom: -250px;
      width: 600px;
      height: 400px;
      border: 1px solid rgba(255,255,255,.1);
      border-radius: 50%;
      content: "";
      transform: rotate(-18deg);
      pointer-events: none;
    }
    .hero-inner { position: relative; z-index: 1; }
    .hero-topline {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 20px;
      color: #e7c77e;
      font-size: 12px;
      font-weight: 750;
      letter-spacing: 0;
      text-transform: uppercase;
    }
    .hero-topline::before {
      width: 25px;
      height: 1px;
      background: currentColor;
      content: "";
    }
    .hero h1 {
      max-width: 920px;
      margin: 0;
      color: #fff;
      font-size: clamp(34px, 4.3vw, 56px);
      line-height: 1.22;
      font-weight: 820;
      letter-spacing: 0;
    }
    .hero-copy {
      max-width: 770px;
      margin: 20px 0 0;
      color: rgba(241, 247, 250, .84);
      font-size: 16px;
      line-height: 1.95;
    }
    .hero-meta {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 11px;
      margin-top: 25px;
    }
    .hero-button {
      min-height: 46px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 9px;
      padding: 0 19px;
      border: 1px solid #e7c77e;
      border-radius: 8px;
      color: #203344;
      background: #e7c77e;
      font-weight: 750;
      transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
    }
    .hero-button:hover { transform: translateY(-2px); background: #f0d697; box-shadow: 0 9px 22px rgba(0,0,0,.18); }
    .hero-button svg { width: 16px; height: 16px; }
    .hero-secondary {
      min-height: 46px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 0 17px;
      border: 1px solid rgba(255,255,255,.3);
      border-radius: 8px;
      color: #fff;
      font-weight: 650;
      transition: background .2s ease, border-color .2s ease;
    }
    .hero-secondary:hover { background: rgba(255,255,255,.1); border-color: rgba(255,255,255,.6); }
    .hero-secondary svg { width: 15px; height: 15px; }
    .hero-status {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-left: 5px;
      color: rgba(241,247,250,.76);
      font-size: 13px;
    }
    .status-dot { width: 7px; height: 7px; border-radius: 50%; background: #62d3ae; box-shadow: 0 0 0 4px rgba(98,211,174,.13); }
    .hero-bottom {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      margin-top: 40px;
      padding-top: 20px;
      border-top: 1px solid rgba(255,255,255,.17);
    }
    .hero-tags { display: flex; flex-wrap: wrap; gap: 8px; }
    .hero-tag {
      padding: 5px 10px;
      border: 1px solid rgba(255,255,255,.2);
      border-radius: 999px;
      color: rgba(255,255,255,.83);
      background: rgba(255,255,255,.06);
      font-size: 12px;
    }
    .hero-note { color: rgba(255,255,255,.64); font-size: 12px; }

    main { display: block; }
    .section { padding: 58px 0; }
    .section-white { background: var(--white); }
    .section-tint { background: #edf3f7; }
    .section-dark { color: #fff; background: #172c3e; }
    .section-head { max-width: 720px; margin-bottom: 28px; }
    .section-head.row-head {
      max-width: none;
      display: flex;
      align-items: end;
      justify-content: space-between;
      gap: 24px;
    }
    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 9px;
      color: var(--blue);
      font-size: 12px;
      font-weight: 800;
      letter-spacing: 0;
    }
    .eyebrow::before { width: 18px; height: 2px; background: var(--teal); content: ""; }
    .section-dark .eyebrow { color: #8ed1c0; }
    .section-title {
      margin: 0;
      color: var(--ink);
      font-size: 28px;
      line-height: 1.35;
      font-weight: 800;
      letter-spacing: 0;
    }
    .section-dark .section-title { color: #fff; }
    .section-intro {
      margin: 11px 0 0;
      color: var(--muted);
      font-size: 14px;
      line-height: 1.9;
    }
    .section-dark .section-intro { color: rgba(234,242,247,.73); }
    .text-link {
      display: inline-flex;
      align-items: center;
      gap: 7px;
      flex: 0 0 auto;
      color: var(--blue);
      font-size: 13px;
      font-weight: 750;
      transition: gap .2s ease, color .2s ease;
    }
    .text-link:hover { gap: 11px; color: var(--blue-dark); }
    .text-link svg { width: 15px; height: 15px; }

    .kpi-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
    .kpi {
      min-height: 143px;
      padding: 20px 21px;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: #fff;
      box-shadow: 0 6px 22px rgba(27,52,75,.045);
    }
    .kpi-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
    .kpi-label { color: var(--muted); font-size: 12px; font-weight: 650; }
    .kpi-icon {
      width: 31px;
      height: 31px;
      display: grid;
      place-items: center;
      border-radius: 9px;
      color: var(--blue);
      background: #e9f3f7;
    }
    .kpi-icon svg { width: 16px; height: 16px; }
    .kpi-value { margin-top: 11px; color: var(--ink); font-size: 26px; line-height: 1.15; font-weight: 820; }
    .kpi-caption { margin-top: 5px; color: var(--faint); font-size: 12px; }

    .matrix-grid { display: grid; grid-template-columns: 1.1fr .9fr .9fr; gap: 16px; }
    .matrix-card {
      position: relative;
      min-height: 206px;
      overflow: hidden;
      padding: 23px;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: #fff;
      box-shadow: 0 8px 24px rgba(27,52,75,.05);
      transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
    }
    .matrix-card:hover { transform: translateY(-4px); border-color: #cadbe4; box-shadow: var(--shadow-hover); }
    .matrix-card.is-featured { color: #fff; border-color: #1a6988; background: linear-gradient(145deg, #176b91, #15516d); }
    .matrix-number { color: #a5b4c0; font-size: 12px; font-weight: 800; }
    .matrix-card.is-featured .matrix-number { color: #b9d9e3; }
    .matrix-card h3 { margin: 13px 0 8px; font-size: 19px; line-height: 1.4; font-weight: 780; }
    .matrix-card p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }
    .matrix-card.is-featured p { color: rgba(255,255,255,.78); }
    .matrix-icon {
      position: absolute;
      right: 20px;
      bottom: 17px;
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      border: 1px solid #e7edf1;
      border-radius: 12px;
      color: var(--blue);
      background: #f5f9fb;
    }
    .matrix-card.is-featured .matrix-icon { color: #e7c77e; border-color: rgba(255,255,255,.22); background: rgba(255,255,255,.08); }
    .matrix-icon svg { width: 20px; height: 20px; }
    .matrix-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; }
    .matrix-tags span { padding: 3px 8px; border-radius: 999px; color: #517183; background: #eff5f7; font-size: 11px; }
    .matrix-card.is-featured .matrix-tags span { color: #fff; background: rgba(255,255,255,.12); }

    .compare-layout { display: grid; grid-template-columns: .82fr 1.18fr; gap: 36px; align-items: center; }
    .compare-aside { padding-right: 10px; }
    .compare-aside .section-title { max-width: 430px; }
    .compare-aside p { max-width: 450px; margin: 14px 0 0; color: var(--muted); line-height: 1.9; }
    .compare-panel {
      overflow: hidden;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: #fff;
      box-shadow: var(--shadow);
    }
    .compare-head, .compare-row {
      display: grid;
      grid-template-columns: 1.1fr 1fr 1fr;
      gap: 12px;
      align-items: center;
      padding: 13px 18px;
    }
    .compare-head { color: #fff; background: #21394c; font-size: 12px; font-weight: 750; }
    .compare-head span:not(:first-child) { text-align: center; }
    .compare-row { min-height: 52px; border-top: 1px solid #edf1f4; color: var(--muted); font-size: 12px; }
    .compare-row strong { color: var(--ink); font-size: 13px; font-weight: 700; }
    .compare-row span:not(:first-child) { text-align: center; }
    .compare-good { color: #168268 !important; font-weight: 750; }
    .compare-neutral { color: #8c7a58 !important; }

    .milestone-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
    .milestone {
      position: relative;
      padding: 4px 24px 4px 20px;
      border-left: 1px solid #d6e3e8;
    }
    .milestone:first-child { border-left: 0; padding-left: 0; }
    .milestone-mark {
      width: 29px;
      height: 29px;
      display: grid;
      place-items: center;
      margin-bottom: 17px;
      border: 1px solid #b8d8d4;
      border-radius: 50%;
      color: #168268;
      background: #e9f6f2;
      font-size: 11px;
      font-weight: 800;
    }
    .milestone h3 { margin: 0 0 7px; font-size: 15px; font-weight: 780; }
    .milestone p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.8; }

    .feature-split { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: stretch; }
    .feature-visual {
      min-height: 290px;
      position: relative;
      overflow: hidden;
      padding: 27px;
      border-radius: var(--radius-lg);
      color: #fff;
      background:
        linear-gradient(125deg, rgba(18, 48, 67, .96), rgba(21, 95, 103, .88)),
        url("https://images.unsplash.com/photo-1455390582262-044c_dead1?auto=format&fit=crop&w=1200&q=85") center/cover;
    }
    .feature-visual::before {
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(11,29,42,.15), rgba(11,29,42,.76));
      content: "";
    }
    .feature-visual-content { position: absolute; right: 27px; bottom: 26px; left: 27px; z-index: 1; }
    .visual-label { color: #e7c77e; font-size: 11px; font-weight: 800; }
    .feature-visual h3 { max-width: 430px; margin: 8px 0 0; font-size: 24px; line-height: 1.45; font-weight: 780; }
    .feature-visual p { max-width: 450px; margin: 9px 0 0; color: rgba(255,255,255,.77); font-size: 12px; }
    .feature-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
    .feature-item {
      min-height: 134px;
      padding: 18px;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: #fff;
      transition: border-color .2s ease, transform .2s ease;
    }
    .feature-item:hover { transform: translateY(-3px); border-color: #bad5df; }
    .feature-item .item-index { color: var(--teal); font-size: 11px; font-weight: 800; }
    .feature-item h3 { margin: 7px 0 5px; font-size: 14px; font-weight: 780; }
    .feature-item p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.7; }

    .content-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
    .article-row {
      display: grid;
      grid-template-columns: 52px 1fr auto;
      gap: 15px;
      align-items: center;
      min-height: 95px;
      padding: 16px;
      border: 1px solid var(--line);
      border-radius: 12px;
      background: #fff;
      transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease;
    }
    .article-row:hover { transform: translateY(-2px); border-color: #c7dce5; box-shadow: 0 9px 20px rgba(27,52,75,.07); }
    .article-icon {
      width: 50px;
      height: 50px;
      display: grid;
      place-items: center;
      border-radius: 11px;
      color: var(--blue);
      background: #eaf3f7;
    }
    .article-icon svg { width: 22px; height: 22px; }
    .article-tag { color: var(--teal); font-size: 10px; font-weight: 800; }
    .article-row h3 { margin: 3px 0 0; font-size: 14px; line-height: 1.5; font-weight: 760; }
    .article-row p { margin: 4px 0 0; color: var(--muted); font-size: 11px; line-height: 1.65; }
    .article-arrow { color: #91a2af; }
    .article-arrow svg { width: 17px; height: 17px; }

    .assurance-band { display: grid; grid-template-columns: 1.1fr repeat(3, 1fr); gap: 18px; align-items: center; }
    .assurance-intro h2 { margin: 0; color: #fff; font-size: 24px; line-height: 1.4; font-weight: 800; }
    .assurance-intro p { margin: 8px 0 0; color: rgba(234,242,247,.69); font-size: 12px; line-height: 1.8; }
    .assurance-point { min-height: 92px; padding: 16px 17px; border-left: 1px solid rgba(255,255,255,.17); }
    .assurance-point svg { width: 21px; height: 21px; color: #7cd0b8; }
    .assurance-point h3 { margin: 8px 0 3px; font-size: 13px; font-weight: 750; }
    .assurance-point p { margin: 0; color: rgba(234,242,247,.66); font-size: 11px; line-height: 1.6; }

    .faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
    .faq-item { padding: 18px 20px; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
    .faq-item h3 { display: flex; gap: 10px; align-items: flex-start; margin: 0; font-size: 14px; line-height: 1.6; font-weight: 780; }
    .faq-q {
      width: 23px;
      height: 23px;
      display: grid;
      place-items: center;
      flex: 0 0 auto;
      border-radius: 7px;
      color: var(--blue);
      background: #eaf3f7;
      font-size: 11px;
      font-weight: 800;
    }
    .faq-item p { margin: 9px 0 0 33px; color: var(--muted); font-size: 12px; line-height: 1.8; }

    .close-band {
      padding: 38px 0;
      color: #fff;
      background: #eaf1f5;
    }
    .close-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 26px;
      padding: 25px 29px;
      border-radius: 16px;
      color: #fff;
      background: linear-gradient(105deg, #176b91, #15566c);
      box-shadow: 0 15px 32px rgba(23,107,145,.16);
    }
    .close-inner h2 { margin: 0; font-size: 21px; line-height: 1.4; font-weight: 800; }
    .close-inner p { margin: 5px 0 0; color: rgba(255,255,255,.77); font-size: 12px; }
    .close-button {
      min-height: 43px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      flex: 0 0 auto;
      gap: 8px;
      padding: 0 16px;
      border: 1px solid rgba(255,255,255,.65);
      border-radius: 8px;
      color: #fff;
      font-size: 13px;
      font-weight: 750;
      transition: background .2s ease, color .2s ease;
    }
    .close-button:hover { color: var(--blue-dark); background: #fff; }
    .close-button svg { width: 15px; height: 15px; }

    .site-footer { padding: 36px 0 22px; color: #d9e3eb; background: #142536; }
    .footer-main { display: grid; grid-template-columns: 1.2fr 1fr; gap: 45px; padding-bottom: 28px; }
    .footer-brand { color: #fff; }
    .footer-copy { max-width: 490px; margin: 13px 0 0; color: #9eafbd; font-size: 12px; line-height: 1.85; }
    .footer-links { display: flex; flex-wrap: wrap; align-content: start; justify-content: flex-end; gap: 10px 23px; padding-top: 8px; }
    .footer-links a { color: #bdcbd6; font-size: 12px; transition: color .2s ease; }
    .footer-links a:hover { color: #fff; }
    .footer-bottom {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 14px;
      padding-top: 17px;
      border-top: 1px solid rgba(255,255,255,.12);
      color: #8397a7;
      font-size: 11px;
    }
    .footer-bottom a { transition: color .2s ease; }
    .footer-bottom a:hover { color: #fff; }
    .back-top {
      width: 33px;
      height: 33px;
      display: grid;
      place-items: center;
      border: 1px solid rgba(255,255,255,.18);
      border-radius: 9px;
      color: #d5e2eb;
      transition: color .2s ease, background .2s ease;
    }
    .back-top:hover { color: #fff; background: rgba(255,255,255,.1); }
    .back-top svg { width: 16px; height: 16px; }

    @media (max-width: 1024px) {
      :root { --container: 940px; }
      .section { padding: 50px 0; }
      .matrix-grid { grid-template-columns: repeat(3, 1fr); }
      .matrix-card { padding: 19px; }
      .assurance-band { grid-template-columns: 1.1fr 1fr 1fr; }
      .assurance-point:last-child { grid-column: 2 / 4; border-top: 1px solid rgba(255,255,255,.14); border-left: 0; padding-top: 14px; }
    }
    @media (max-width: 768px) {
      .container { width: min(100% - 36px, var(--container)); }
      .brand-row { min-height: 66px; }
      .brand { font-size: 15px; }
      .brand-mark { width: 35px; height: 35px; }
      .header-note { display: none; }
      .nav-scroll { gap: 6px; }
      .nav-chip { padding-inline: 13px; font-size: 12px; }
      .nav-chip.nav-cta { margin-left: 0; }
      .hero { padding: 44px 0 35px; }
      .hero-copy { font-size: 14px; }
      .hero-bottom { align-items: flex-start; flex-direction: column; margin-top: 30px; }
      .section { padding: 44px 0; }
      .section-title { font-size: 24px; }
      .kpi-grid { grid-template-columns: repeat(2, 1fr); }
      .matrix-grid { grid-template-columns: 1fr 1fr; }
      .matrix-card:first-child { grid-column: 1 / -1; }
      .compare-layout { grid-template-columns: 1fr; gap: 23px; }
      .compare-aside p { max-width: 650px; }
      .milestone-grid { grid-template-columns: repeat(2, 1fr); gap: 24px 0; }
      .milestone:nth-child(3) { border-left: 0; padding-left: 0; }
      .feature-split { grid-template-columns: 1fr; }
      .feature-visual { min-height: 255px; }
      .assurance-band { grid-template-columns: 1fr 1fr; }
      .assurance-intro { grid-column: 1 / -1; }
      .assurance-point:last-child { grid-column: auto; border-top: 0; border-left: 1px solid rgba(255,255,255,.17); }
      .faq-grid { grid-template-columns: 1fr; }
      .footer-main { grid-template-columns: 1fr; gap: 20px; }
      .footer-links { justify-content: flex-start; }
    }
    @media (max-width: 520px) {
      .container { width: calc(100% - 30px); }
      .brand { max-width: 250px; font-size: 14px; }
      .brand-mark { width: 33px; height: 33px; }
      .nav-scroll { margin-right: -15px; padding-right: 15px; }
      .hero { padding: 38px 0 30px; }
      .hero h1 { font-size: 32px; }
      .hero-copy { margin-top: 15px; font-size: 13px; line-height: 1.85; }
      .hero-meta { align-items: stretch; flex-direction: column; }
      .hero-button, .hero-secondary { width: 100%; }
      .hero-status { margin: 3px 0 0; }
      .hero-tags { gap: 6px; }
      .hero-tag { padding: 4px 8px; font-size: 11px; }
      .section { padding: 38px 0; }
      .section-head.row-head { align-items: flex-start; flex-direction: column; gap: 12px; }
      .section-title { font-size: 22px; }
      .section-intro { font-size: 13px; }
      .kpi-grid { gap: 9px; }
      .kpi { min-height: 128px; padding: 15px; }
      .kpi-value { font-size: 23px; }
      .matrix-grid { grid-template-columns: 1fr; gap: 10px; }
      .matrix-card:first-child { grid-column: auto; }
      .matrix-card { min-height: 178px; }
      .compare-panel { overflow-x: auto; }
      .compare-head, .compare-row { min-width: 450px; }
      .compare-head, .compare-row { padding-inline: 13px; }
      .milestone-grid { grid-template-columns: 1fr; gap: 0; }
      .milestone, .milestone:first-child, .milestone:nth-child(3) { min-height: 117px; padding: 0 0 19px 43px; border-left: 1px solid #d6e3e8; }
      .milestone-mark { position: absolute; top: 0; left: -15px; margin: 0; }
      .milestone:last-child { min-height: auto; border-left-color: transparent; }
      .feature-list { grid-template-columns: 1fr 1fr; gap: 9px; }
      .feature-item { min-height: 144px; padding: 14px; }
      .feature-visual { min-height: 235px; padding: 20px; }
      .feature-visual-content { right: 20px; bottom: 20px; left: 20px; }
      .feature-visual h3 { font-size: 20px; }
      .content-grid { grid-template-columns: 1fr; gap: 10px; }
      .article-row { grid-template-columns: 44px 1fr auto; gap: 11px; min-height: 90px; padding: 13px; }
      .article-icon { width: 43px; height: 43px; }
      .article-row h3 { font-size: 13px; }
      .assurance-band { grid-template-columns: 1fr; gap: 10px; }
      .assurance-intro { grid-column: auto; }
      .assurance-point, .assurance-point:last-child { min-height: auto; padding: 12px 0 12px 14px; border-top: 0; border-left: 1px solid rgba(255,255,255,.17); }
      .faq-item { padding: 15px; }
      .faq-item p { margin-left: 0; }
      .close-band { padding: 26px 0; }
      .close-inner { align-items: flex-start; flex-direction: column; padding: 22px; }
      .close-inner h2 { font-size: 19px; }
      .close-button { width: 100%; }
      .footer-bottom { align-items: flex-start; }
      .footer-bottom > span { max-width: 85%; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
    }

/* roulang page: category1 */
:root {
      --ink: #172638;
      --muted: #607184;
      --faint: #8998a8;
      --paper: #f4f7fb;
      --white: #ffffff;
      --line: #e1e8ef;
      --blue: #176b91;
      --blue-dark: #105473;
      --teal: #31a78b;
      --gold: #c79a49;
      --gold-pale: #f7efdf;
      --radius: 14px;
      --radius-lg: 22px;
      --shadow: 0 14px 40px rgba(27, 52, 75, .08);
      --shadow-hover: 0 18px 46px rgba(27, 52, 75, .13);
      --container: 1160px;
    }
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 130px; }
    body {
      margin: 0;
      background: var(--paper);
      color: var(--ink);
      font-family: Inter, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      font-size: 15px;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    a { color: inherit; text-decoration: none; }
    button, input { font: inherit; }
    button, a { -webkit-tap-highlight-color: transparent; }
    button:focus-visible, a:focus-visible, input:focus-visible {
      outline: 3px solid rgba(49, 167, 139, .48);
      outline-offset: 3px;
    }
    img { display: block; max-width: 100%; }
    .container { width: min(var(--container), calc(100% - 48px)); margin-inline: auto; }
    .site-header {
      position: sticky;
      z-index: 30;
      top: 0;
      background: rgba(255, 255, 255, .94);
      border-bottom: 1px solid rgba(225, 232, 239, .9);
      backdrop-filter: blur(14px);
    }
    .brand-row {
      min-height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }
    .brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      min-width: 0;
      color: var(--ink);
      font-weight: 800;
      font-size: 17px;
      line-height: 1.25;
    }
    .brand-mark {
      width: 38px;
      height: 38px;
      display: grid;
      place-items: center;
      flex: 0 0 auto;
      border-radius: 12px;
      color: #fff;
      background: linear-gradient(145deg, #176b91, #31a78b);
      box-shadow: 0 7px 16px rgba(23, 107, 145, .2);
    }
    .brand-mark svg { width: 20px; height: 20px; }
    .header-note { color: var(--muted); font-size: 13px; white-space: nowrap; }
    .nav-wrap { border-top: 1px solid #f0f3f6; overflow: hidden; }
    .nav-scroll {
      display: flex;
      gap: 9px;
      padding: 11px 0 12px;
      overflow-x: auto;
      scrollbar-width: none;
    }
    .nav-scroll::-webkit-scrollbar { display: none; }
    .nav-chip {
      min-height: 36px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      flex: 0 0 auto;
      padding: 0 15px;
      border: 1px solid transparent;
      border-radius: 999px;
      color: #506477;
      font-size: 13px;
      font-weight: 650;
      transition: color .2s ease, background .2s ease, border-color .2s ease;
    }
    .nav-chip:hover { color: var(--blue); background: #f0f7fa; }
    .nav-chip.is-active { color: var(--blue-dark); background: #eaf4f7; border-color: #d2e6ec; }
    .nav-chip.nav-cta {
      margin-left: auto;
      color: #fff;
      background: var(--blue);
      box-shadow: 0 5px 13px rgba(23, 107, 145, .16);
    }
    .nav-chip.nav-cta:hover { background: var(--blue-dark); }
    .hero {
      position: relative;
      overflow: hidden;
      padding: 54px 0 48px;
      color: #fff;
      background:
        radial-gradient(ellipse at 82% 20%, rgba(199, 154, 73, .21), transparent 28%),
        linear-gradient(112deg, #142638 0%, #183c50 56%, #155d6b 100%);
    }
    .hero::after {
      position: absolute;
      right: -90px;
      bottom: -250px;
      width: 600px;
      height: 400px;
      border: 1px solid rgba(255,255,255,.1);
      border-radius: 50%;
      content: "";
      transform: rotate(-18deg);
      pointer-events: none;
    }
    .hero-inner { position: relative; z-index: 1; }
    .hero-topline {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 20px;
      color: #e7c77e;
      font-size: 12px;
      font-weight: 750;
    }
    .hero-topline::before { width: 25px; height: 1px; background: currentColor; content: ""; }
    .hero h1 {
      max-width: 920px;
      margin: 0;
      color: #fff;
      font-size: clamp(34px, 4.3vw, 56px);
      line-height: 1.22;
      font-weight: 820;
    }
    .hero-copy { max-width: 770px; margin: 20px 0 0; color: rgba(241,247,250,.84); font-size: 16px; line-height: 1.95; }
    .hero-meta { display: flex; align-items: center; flex-wrap: wrap; gap: 11px; margin-top: 25px; }
    .hero-button, .hero-secondary {
      min-height: 46px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 9px;
      padding: 0 19px;
      border: 1px solid #e7c77e;
      border-radius: 8px;
      color: #203344;
      background: #e7c77e;
      font-weight: 750;
      transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
    }
    .hero-button:hover { transform: translateY(-2px); background: #f0d697; box-shadow: 0 9px 22px rgba(0,0,0,.18); }
    .hero-button svg, .hero-secondary svg { width: 16px; height: 16px; }
    .hero-secondary {
      border-color: rgba(255,255,255,.3);
      color: #fff;
      background: transparent;
      font-weight: 650;
    }
    .hero-secondary:hover { background: rgba(255,255,255,.1); border-color: rgba(255,255,255,.6); }
    .hero-status { display: inline-flex; align-items: center; gap: 8px; margin-left: 5px; color: rgba(241,247,250,.76); font-size: 13px; }
    .hero-bottom {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      margin-top: 40px;
      padding-top: 20px;
      border-top: 1px solid rgba(255,255,255,.17);
    }
    .hero-tags { display: flex; flex-wrap: wrap; gap: 8px; }
    .hero-tag { padding: 5px 10px; border: 1px solid rgba(255,255,255,.2); border-radius: 999px; color: rgba(255,255,255,.83); background: rgba(255,255,255,.06); font-size: 12px; }
    .hero-note { color: rgba(255,255,255,.64); font-size: 12px; }
    main { display: block; }
    .section { padding: 58px 0; }
    .section-white { background: var(--white); }
    .section-line { border-top: 1px solid var(--line); }
    .section-head { max-width: 760px; margin-bottom: 28px; }
    .eyebrow {
      margin: 0 0 8px;
      color: var(--blue);
      font-size: 12px;
      font-weight: 800;
    }
    .section-title { margin: 0; color: var(--ink); font-size: 29px; line-height: 1.3; font-weight: 800; }
    .section-intro { margin: 12px 0 0; color: var(--muted); font-size: 15px; }
    .pill {
      display: inline-flex;
      align-items: center;
      padding: 5px 10px;
      border: 1px solid #dce9ed;
      border-radius: 999px;
      color: var(--blue-dark);
      background: #f0f7f8;
      font-size: 12px;
      font-weight: 700;
    }
    .feature-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
    .feature-card {
      min-height: 184px;
      padding: 24px;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background: #fff;
      box-shadow: var(--shadow);
      transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
    }
    .feature-card:hover { transform: translateY(-3px); border-color: #cbdde5; box-shadow: var(--shadow-hover); }
    .feature-card h3 { margin: 15px 0 8px; font-size: 17px; line-height: 1.45; }
    .feature-card p { margin: 0; color: var(--muted); font-size: 14px; }
    .feature-icon {
      width: 38px;
      height: 38px;
      display: grid;
      place-items: center;
      border-radius: 11px;
      color: var(--blue);
      background: #eaf4f7;
    }
    .feature-icon svg { width: 19px; height: 19px; }
    .split-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(300px, .82fr); gap: 48px; align-items: center; }
    .split-copy h2 { margin: 0; font-size: 29px; line-height: 1.35; }
    .split-copy p { margin: 14px 0 0; color: var(--muted); }
    .check-list { display: grid; gap: 13px; margin: 22px 0 0; padding: 0; list-style: none; }
    .check-list li { display: flex; gap: 11px; align-items: flex-start; color: #3b5062; }
    .check {
      width: 21px; height: 21px; flex: 0 0 auto; display: grid; place-items: center;
      margin-top: 2px; border-radius: 50%; color: #16775f; background: #e5f4ef;
      font-size: 12px; font-weight: 800;
    }
    .code-panel {
      overflow: hidden;
      border: 1px solid #dce5eb;
      border-radius: var(--radius-lg);
      background: #fff;
      box-shadow: var(--shadow);
    }
    .code-panel-head { display: flex; justify-content: space-between; align-items: center; padding: 16px 20px; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 13px; }
    .code-panel-body { padding: 22px; }
    .encoding-row { display: grid; grid-template-columns: 95px 1fr auto; gap: 12px; align-items: center; padding: 13px 0; border-bottom: 1px solid #edf1f4; }
    .encoding-row:last-child { border-bottom: 0; }
    .encoding-name { color: var(--ink); font-weight: 750; }
    .encoding-desc { color: var(--muted); font-size: 13px; }
    .encoding-state { color: #16775f; font-size: 12px; font-weight: 750; }
    .format-layout { display: grid; grid-template-columns: minmax(230px, .7fr) 1.3fr; gap: 32px; align-items: start; }
    .format-note { padding: 24px; border-left: 3px solid var(--teal); background: #edf7f5; }
    .format-note strong { display: block; margin-bottom: 8px; font-size: 16px; }
    .format-note p { margin: 0; color: var(--muted); font-size: 14px; }
    .format-list { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 12px; }
    .format-item { padding: 17px 18px; border: 1px solid var(--line); border-radius: 11px; background: #fff; }
    .format-item b { display: block; margin-bottom: 5px; }
    .format-item span { color: var(--muted); font-size: 13px; }
    .symptom-layout { display: grid; grid-template-columns: .75fr 1.25fr; gap: 46px; align-items: start; }
    .symptom-list { display: grid; gap: 0; margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
    .symptom-list li { display: grid; grid-template-columns: 145px 1fr; gap: 20px; padding: 17px 0; border-bottom: 1px solid var(--line); }
    .symptom-list b { font-size: 14px; }
    .symptom-list span { color: var(--muted); font-size: 14px; }
    .wide-callout {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 25px;
      padding: 27px 30px;
      border: 1px solid #d6e7ea;
      border-radius: var(--radius);
      background: #edf6f7;
    }
    .wide-callout h2 { margin: 0; font-size: 21px; line-height: 1.4; }
    .wide-callout p { margin: 6px 0 0; color: var(--muted); }
    .text-link {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      flex: 0 0 auto;
      min-height: 42px;
      padding: 0 15px;
      border: 1px solid #bfd9e0;
      border-radius: 8px;
      color: var(--blue-dark);
      background: #fff;
      font-size: 13px;
      font-weight: 750;
      transition: background .2s ease, border-color .2s ease, transform .2s ease;
    }
    .text-link:hover { transform: translateY(-1px); border-color: var(--blue); background: #f8fcfd; }
    .table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow); }
    .compat-table { width: 100%; border-collapse: collapse; text-align: left; }
    .compat-table th, .compat-table td { padding: 15px 18px; border-bottom: 1px solid #edf1f4; }
    .compat-table th { color: #52677a; background: #f7f9fb; font-size: 12px; font-weight: 800; }
    .compat-table td { color: #3f5365; font-size: 14px; }
    .compat-table tr:last-child td { border-bottom: 0; }
    .compat-table td:first-child { color: var(--ink); font-weight: 750; }
    .split-band { color: #fff; background: #17394d; }
    .split-band .section-title { color: #fff; }
    .split-band .section-intro { color: rgba(255,255,255,.72); }
    .split-cases { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 1px; margin-top: 29px; background: rgba(255,255,255,.18); border: 1px solid rgba(255,255,255,.16); }
    .split-case { min-height: 160px; padding: 23px; background: #17394d; }
    .split-case span { display: block; margin-bottom: 13px; color: #e7c77e; font-size: 12px; font-weight: 750; }
    .split-case h3 { margin: 0 0 7px; color: #fff; font-size: 17px; }
    .split-case p { margin: 0; color: rgba(255,255,255,.7); font-size: 13px; }
    .article-layout { display: grid; grid-template-columns: .7fr 1.3fr; gap: 48px; align-items: start; }
    .article-list { display: grid; }
    .article-item { display: grid; grid-template-columns: 46px 1fr auto; gap: 16px; align-items: center; padding: 17px 0; border-top: 1px solid var(--line); }
    .article-number { color: #9aabb8; font-size: 13px; font-weight: 800; }
    .article-item h3 { margin: 0; font-size: 15px; }
    .article-item p { margin: 4px 0 0; color: var(--muted); font-size: 13px; }
    .article-arrow { color: var(--blue); font-size: 18px; transition: transform .2s ease; }
    .article-item:hover .article-arrow { transform: translateX(4px); }
    .stat-band { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow); }
    .stat-item { padding: 24px 20px; border-right: 1px solid var(--line); }
    .stat-item:last-child { border-right: 0; }
    .stat-item strong { display: block; color: var(--blue-dark); font-size: 20px; }
    .stat-item span { color: var(--muted); font-size: 12px; }
    .faq-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
    .faq-item { padding: 20px; border: 1px solid var(--line); border-radius: 11px; background: #fff; }
    .faq-item h3 { margin: 0 0 8px; font-size: 15px; }
    .faq-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .close-band {
      position: relative;
      overflow: hidden;
      padding: 38px 0;
      color: #fff;
      background: linear-gradient(105deg, #176b91, #167d79);
    }
    .close-inner { display: flex; align-items: center; justify-content: space-between; gap: 26px; }
    .close-inner h2 { margin: 0; font-size: 24px; line-height: 1.35; }
    .close-inner p { margin: 7px 0 0; color: rgba(255,255,255,.8); }
    .close-button {
      min-height: 44px; display: inline-flex; align-items: center; justify-content: center; gap: 9px;
      flex: 0 0 auto; padding: 0 17px; border-radius: 8px; color: #17394d; background: #fff;
      font-size: 13px; font-weight: 800; transition: transform .2s ease, box-shadow .2s ease;
    }
    .close-button:hover { transform: translateY(-2px); box-shadow: 0 9px 20px rgba(0,0,0,.15); }
    .site-footer { padding: 37px 0 20px; color: #d6e0e8; background: #142638; }
    .footer-main { display: grid; grid-template-columns: 1fr auto; gap: 40px; padding-bottom: 28px; }
    .footer-brand { color: #fff; }
    .footer-copy { max-width: 560px; margin: 14px 0 0; color: #aab8c4; font-size: 13px; }
    .footer-links { display: flex; align-items: flex-start; flex-wrap: wrap; gap: 13px 22px; }
    .footer-links a { color: #c5d0d9; font-size: 13px; transition: color .2s ease; }
    .footer-links a:hover { color: #fff; }
    .footer-bottom { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding-top: 17px; border-top: 1px solid rgba(255,255,255,.13); color: #9faebb; font-size: 12px; }
    .back-top { width: 36px; height: 36px; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.2); border-radius: 50%; transition: background .2s ease; }
    .back-top:hover { background: rgba(255,255,255,.1); }
    .back-top svg { width: 17px; height: 17px; }
    @media (max-width: 1024px) {
      .split-layout { gap: 30px; }
      .symptom-layout, .article-layout { gap: 30px; }
      .feature-card { padding: 21px; }
    }
    @media (max-width: 768px) {
      .container { width: min(var(--container), calc(100% - 36px)); }
      .brand-row { min-height: 68px; }
      .header-note { display: none; }
      .nav-chip.nav-cta { margin-left: 0; }
      .hero { padding: 42px 0 36px; }
      .hero h1 { font-size: 38px; }
      .hero-bottom { align-items: flex-start; flex-direction: column; margin-top: 29px; }
      .section { padding: 45px 0; }
      .feature-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
      .split-layout, .format-layout, .symptom-layout, .article-layout { grid-template-columns: 1fr; }
      .split-layout { gap: 25px; }
      .split-cases { grid-template-columns: 1fr; }
      .split-case { min-height: auto; }
      .stat-band { grid-template-columns: repeat(2,1fr); }
      .stat-item:nth-child(2) { border-right: 0; }
      .stat-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
      .footer-main { grid-template-columns: 1fr; gap: 23px; }
      .close-inner { align-items: flex-start; flex-direction: column; }
    }
    @media (max-width: 520px) {
      .container { width: calc(100% - 30px); }
      .brand { gap: 9px; font-size: 15px; }
      .brand-mark { width: 34px; height: 34px; border-radius: 10px; }
      .hero { padding: 36px 0 31px; }
      .hero h1 { font-size: 33px; }
      .hero-copy { font-size: 14px; }
      .hero-meta { align-items: stretch; flex-direction: column; }
      .hero-button, .hero-secondary { width: 100%; }
      .hero-status { margin: 4px 0 0; }
      .section { padding: 38px 0; }
      .section-title, .split-copy h2 { font-size: 24px; }
      .feature-grid, .format-list, .faq-list { grid-template-columns: 1fr; }
      .feature-card { min-height: auto; }
      .encoding-row { grid-template-columns: 76px 1fr; gap: 4px 10px; }
      .encoding-state { grid-column: 2; }
      .symptom-list li { grid-template-columns: 1fr; gap: 4px; }
      .wide-callout { align-items: flex-start; flex-direction: column; padding: 22px; }
      .compat-table th, .compat-table td { min-width: 130px; padding: 12px; }
      .article-item { grid-template-columns: 29px 1fr auto; gap: 10px; }
      .stat-item { padding: 19px 14px; }
      .close-inner h2 { font-size: 21px; }
      .footer-links { gap: 11px 17px; }
      .footer-bottom { align-items: flex-start; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
    }