/* roulang page: index */
:root {
      color-scheme: dark;
      --bg: #08111d;
      --bg-soft: #0c1826;
      --surface: rgba(17, 31, 47, .78);
      --surface-solid: #122235;
      --surface-light: #172b40;
      --text: #edf4f8;
      --muted: #a2b2bf;
      --faint: #718493;
      --line: rgba(180, 207, 221, .14);
      --cyan: #66e1d0;
      --blue: #73b7ff;
      --lime: #cbef85;
      --coral: #ff9c83;
      --radius: 10px;
      --radius-lg: 18px;
      --shadow: 0 18px 50px rgba(0, 0, 0, .27);
      --container: 1160px;
    }
    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 90px; }
    body {
      margin: 0;
      min-width: 320px;
      background: var(--bg);
      color: var(--text);
      font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
      font-size: 15px;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    a { color: inherit; text-decoration: none; transition: color .2s ease, background .2s ease, border-color .2s ease, transform .2s ease, box-shadow .2s ease; }
    img { display: block; max-width: 100%; }
    button, input { font: inherit; }
    button { color: inherit; }
    :focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }
    .container { width: min(var(--container), calc(100% - 48px)); margin-inline: auto; }
    .site-header {
      position: sticky;
      z-index: 50;
      top: 0;
      background: rgba(8, 17, 29, .88);
      border-bottom: 1px solid var(--line);
      backdrop-filter: blur(18px);
    }
    .nav-shell { min-height: 74px; display: flex; align-items: center; gap: 28px; }
    .brand { display: inline-flex; align-items: center; gap: 11px; min-width: max-content; font-size: 16px; font-weight: 750; letter-spacing: 0; }
    .brand-mark {
      display: grid; place-items: center; width: 35px; height: 35px;
      color: #07171a; background: var(--cyan); border-radius: 9px;
      font-size: 14px; font-weight: 900; box-shadow: 0 0 24px rgba(102, 225, 208, .22);
    }
    .nav-links { display: flex; align-items: center; gap: 7px; margin-left: auto; }
    .nav-link { padding: 9px 14px; color: var(--muted); font-size: 14px; border-radius: 7px; }
    .nav-link:hover, .nav-link:focus-visible { color: var(--text); background: rgba(255,255,255,.06); }
    .nav-link.active { color: var(--cyan); background: rgba(102,225,208,.09); }
    .nav-tools { display: flex; align-items: center; gap: 12px; }
    .language-pill {
      display: inline-flex; align-items: center; gap: 8px; padding: 7px 11px;
      border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font-size: 12px;
    }
    .language-pill b { color: var(--text); font-weight: 650; }
    .language-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--lime); box-shadow: 0 0 10px var(--lime); }
    .menu-toggle { display: none; width: 40px; height: 40px; padding: 9px; background: transparent; border: 1px solid var(--line); border-radius: 8px; cursor: pointer; }
    .menu-toggle span { display: block; height: 2px; margin: 4px 0; background: var(--text); border-radius: 2px; }
    .hero {
      position: relative; isolation: isolate; overflow: hidden; min-height: 460px;
      display: flex; align-items: center; background: #102231;
    }
    .hero::before {
      content: ""; position: absolute; inset: 0; z-index: -2;
      background: linear-gradient(90deg, rgba(6,14,23,.94) 0%, rgba(6,14,23,.78) 48%, rgba(6,14,23,.22) 100%),
        linear-gradient(0deg, rgba(8,17,29,.55), transparent 52%),
        url("https://images.unsplash.com/photo-1489599849927-2ee91a8c8a07?auto=format&fit=crop&w=2000&q=88") center 43% / cover;
    }
    .hero::after {
      content: ""; position: absolute; z-index: -1; inset: 0;
      background: linear-gradient(115deg, rgba(102,225,208,.06), transparent 46%, rgba(115,183,255,.09));
    }
    .hero-inner { padding-block: 76px 70px; max-width: 760px; }
    .eyebrow { display: inline-flex; align-items: center; gap: 10px; color: var(--cyan); font-size: 12px; font-weight: 700; letter-spacing: 0; }
    .eyebrow::before { content: ""; width: 23px; height: 1px; background: currentColor; }
    h1 { max-width: 720px; margin: 17px 0 16px; font-size: clamp(34px, 5vw, 52px); line-height: 1.2; font-weight: 780; letter-spacing: 0; }
    .hero-copy { max-width: 710px; margin: 0; color: #d2dce3; font-size: 16px; line-height: 1.9; }
    .hero-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
    .hero-tag { padding: 6px 11px; border: 1px solid rgba(214,235,243,.22); border-radius: 5px; background: rgba(10,24,36,.4); color: #d9e7ed; font-size: 12px; }
    .hero-action { display: flex; flex-wrap: wrap; align-items: center; gap: 15px; margin-top: 27px; }
    .button {
      display: inline-flex; align-items: center; justify-content: center; gap: 9px;
      min-height: 44px; padding: 10px 17px; border: 1px solid transparent; border-radius: 7px;
      background: var(--cyan); color: #06191b; font-size: 14px; font-weight: 750; cursor: pointer;
      box-shadow: 0 7px 25px rgba(102,225,208,.2);
    }
    .button:hover { transform: translateY(-2px); background: #8af0e2; box-shadow: 0 10px 30px rgba(102,225,208,.3); }
    .button.secondary { border-color: rgba(226,241,248,.28); background: rgba(13,28,41,.42); color: var(--text); box-shadow: none; }
    .button.secondary:hover { background: rgba(255,255,255,.1); border-color: rgba(226,241,248,.48); }
    .button.small { min-height: 37px; padding: 7px 12px; font-size: 13px; }
    .hero-note { color: #b5c5cd; font-size: 12px; }
    main { overflow: hidden; }
    .section { padding: 72px 0; border-bottom: 1px solid rgba(180,207,221,.09); }
    .section.alt { background: var(--bg-soft); }
    .section.deep { background: #0a1522; }
    .section-head { display: flex; justify-content: space-between; align-items: end; gap: 28px; margin-bottom: 27px; }
    .section-kicker { margin-bottom: 5px; color: var(--cyan); font-size: 11px; font-weight: 750; }
    h2 { margin: 0; font-size: 27px; line-height: 1.35; font-weight: 740; letter-spacing: 0; }
    .section-intro { max-width: 720px; margin: 11px 0 0; color: var(--muted); font-size: 14px; line-height: 1.85; }
    .section-link { flex: 0 0 auto; color: var(--cyan); font-size: 13px; }
    .section-link:hover { color: #a1f4e8; }
    .metric-band { padding: 27px 0; background: #0c1a28; border-bottom: 1px solid var(--line); }
    .metrics { display: grid; grid-template-columns: repeat(4, 1fr); }
    .metric { padding: 4px 24px; border-right: 1px solid var(--line); }
    .metric:first-child { padding-left: 0; }
    .metric:last-child { border-right: 0; }
    .metric strong { display: block; color: var(--text); font-size: 24px; line-height: 1.25; }
    .metric span { color: var(--faint); font-size: 12px; }
    .feature-grid { display: grid; grid-template-columns: 1.18fr .82fr; gap: 16px; }
    .feature-panel {
      position: relative; overflow: hidden; min-height: 230px; padding: 27px;
      border: 1px solid var(--line); border-radius: var(--radius-lg);
      background: linear-gradient(135deg, rgba(25,49,66,.95), rgba(14,29,44,.84));
      box-shadow: var(--shadow);
    }
    .feature-panel::after { content: ""; position: absolute; width: 190px; height: 190px; right: -68px; bottom: -95px; border: 1px solid rgba(102,225,208,.16); border-radius: 50%; box-shadow: 0 0 0 22px rgba(102,225,208,.025), 0 0 0 48px rgba(102,225,208,.02); }
    .feature-panel h3 { max-width: 390px; margin: 8px 0 10px; font-size: 21px; line-height: 1.4; }
    .feature-panel p { max-width: 470px; margin: 0; color: var(--muted); font-size: 13px; }
    .feature-label { color: var(--lime); font-size: 11px; font-weight: 700; }
    .feature-side { display: grid; gap: 16px; }
    .mini-feature { padding: 20px 21px; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(20,38,56,.72); }
    .mini-feature h3 { margin: 0 0 6px; font-size: 15px; }
    .mini-feature p { margin: 0; color: var(--muted); font-size: 12px; }
    .topic-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
    .topic-card { min-height: 154px; display: flex; flex-direction: column; justify-content: space-between; padding: 18px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
    .topic-card:hover { transform: translateY(-3px); border-color: rgba(102,225,208,.45); background: var(--surface-light); }
    .topic-index { color: var(--cyan); font-size: 11px; font-weight: 750; }
    .topic-card h3 { margin: 12px 0 4px; font-size: 16px; }
    .topic-card p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.65; }
    .topic-card .topic-count { margin-top: 12px; color: var(--faint); font-size: 11px; }
    .scene-layout { display: grid; grid-template-columns: .85fr 1.15fr; gap: 32px; align-items: start; }
    .scene-copy { max-width: 370px; }
    .scene-list { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
    .scene-item { display: flex; gap: 13px; padding: 16px; border-left: 2px solid rgba(102,225,208,.55); background: rgba(255,255,255,.025); }
    .scene-num { color: var(--cyan); font-size: 12px; font-weight: 750; }
    .scene-item h3 { margin: 0 0 4px; font-size: 14px; }
    .scene-item p { margin: 0; color: var(--muted); font-size: 12px; }
    .steps { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); }
    .step { position: relative; padding: 22px 22px 0 0; }
    .step::before { content: ""; position: absolute; top: -4px; left: 0; width: 7px; height: 7px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 12px rgba(102,225,208,.6); }
    .step small { color: var(--faint); font-size: 11px; }
    .step h3 { margin: 7px 0 5px; font-size: 15px; }
    .step p { margin: 0; color: var(--muted); font-size: 12px; }
    .showcase { display: grid; grid-template-columns: 1.1fr .9fr; min-height: 310px; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius-lg); background: #102133; }
    .showcase-image { position: relative; min-height: 310px; background: url("https://images.unsplash.com/photo-1478720568477-152d9b164e26?auto=format&fit=crop&w=1200&q=85") center / cover; }
    .showcase-image::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, transparent 55%, rgba(16,33,51,.55)); }
    .showcase-content { display: flex; flex-direction: column; justify-content: center; padding: 30px; }
    .showcase-content h3 { margin: 8px 0 10px; font-size: 22px; }
    .showcase-content p { margin: 0; color: var(--muted); font-size: 13px; }
    .showcase-caption { margin-top: 20px; padding-top: 15px; border-top: 1px solid var(--line); color: var(--faint); font-size: 11px; }
    .quote-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 13px; }
    .quote { padding: 21px; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(18,34,53,.62); }
    .quote p { margin: 0 0 15px; color: #d4e0e6; font-size: 13px; }
    .quote strong { display: block; font-size: 12px; }
    .quote span { color: var(--faint); font-size: 11px; }
    .compare-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
    .compare { width: 100%; border-collapse: collapse; min-width: 600px; }
    .compare th, .compare td { padding: 15px 18px; text-align: left; border-bottom: 1px solid var(--line); font-size: 13px; }
    .compare th { color: var(--muted); background: rgba(255,255,255,.035); font-weight: 650; }
    .compare tr:last-child td { border-bottom: 0; }
    .compare td:first-child { color: var(--text); font-weight: 650; }
    .yes { color: var(--lime); }
    .limited { color: var(--coral); }
    .article-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 28px; }
    .article-feature { min-height: 270px; display: flex; flex-direction: column; justify-content: end; padding: 25px; border-radius: var(--radius-lg); background: linear-gradient(0deg, rgba(5,14,23,.96), rgba(5,14,23,.06) 82%), url("https://images.unsplash.com/photo-1485846234645-a62644f84728?auto=format&fit=crop&w=1200&q=85") center / cover; }
    .article-feature h3 { margin: 10px 0 8px; font-size: 21px; }
    .article-feature p { max-width: 520px; margin: 0; color: #c6d3da; font-size: 13px; }
    .article-list { display: grid; align-content: start; }
    .article-item { display: block; padding: 16px 0; border-bottom: 1px solid var(--line); }
    .article-item:first-child { padding-top: 2px; }
    .article-item:hover h3 { color: var(--cyan); }
    .article-item time { color: var(--faint); font-size: 11px; }
    .article-item h3 { margin: 5px 0 4px; font-size: 14px; transition: color .2s ease; }
    .article-item p { margin: 0; color: var(--muted); font-size: 12px; }
    .trust-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
    .trust-item { display: flex; gap: 14px; padding: 18px; border-top: 1px solid var(--line); }
    .trust-icon { display: grid; flex: 0 0 34px; place-items: center; width: 34px; height: 34px; border: 1px solid rgba(102,225,208,.3); border-radius: 8px; color: var(--cyan); font-size: 15px; }
    .trust-item h3 { margin: 0 0 4px; font-size: 14px; }
    .trust-item p { margin: 0; color: var(--muted); font-size: 12px; }
    .quick-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
    .quick-card { padding: 20px; border-radius: var(--radius); background: rgba(255,255,255,.035); border: 1px solid var(--line); }
    .quick-card h3 { margin: 0 0 8px; font-size: 14px; }
    .quick-card p { margin: 0; color: var(--muted); font-size: 12px; }
    .faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 22px; }
    details { border-bottom: 1px solid var(--line); }
    summary { position: relative; padding: 15px 28px 15px 0; list-style: none; cursor: pointer; font-size: 14px; font-weight: 650; }
    summary::-webkit-details-marker { display: none; }
    summary::after { content: "+"; position: absolute; right: 2px; color: var(--cyan); font-size: 19px; top: 10px; }
    details[open] summary::after { content: "−"; }
    details p { margin: 0; padding: 0 18px 16px 0; color: var(--muted); font-size: 12px; }
    .closing { padding: 39px; display: flex; align-items: center; justify-content: space-between; gap: 24px; border: 1px solid rgba(102,225,208,.22); border-radius: var(--radius-lg); background: linear-gradient(110deg, rgba(20,51,59,.74), rgba(17,34,51,.75)); }
    .closing h2 { font-size: 22px; }
    .closing p { max-width: 670px; margin: 8px 0 0; color: var(--muted); font-size: 13px; }
    .site-footer { padding: 36px 0 22px; background: #060d16; }
    .footer-main { display: flex; justify-content: space-between; gap: 36px; padding-bottom: 25px; }
    .footer-brand { max-width: 430px; }
    .footer-brand p { margin: 13px 0 0; color: var(--faint); font-size: 12px; }
    .footer-links { display: flex; flex-wrap: wrap; align-content: start; gap: 10px 24px; color: var(--muted); font-size: 12px; }
    .footer-links a:hover { color: var(--cyan); }
    .footer-bottom { display: flex; justify-content: space-between; gap: 18px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--faint); font-size: 11px; }
    .age-note { color: #b8c6cd; }
    @media (max-width: 1024px) {
      .container { width: min(var(--container), calc(100% - 36px)); }
      .nav-shell { gap: 16px; }
      .brand { font-size: 14px; }
      .nav-link { padding-inline: 10px; }
      .topic-grid { grid-template-columns: repeat(2, 1fr); }
      .feature-grid, .scene-layout { gap: 20px; }
      .section { padding: 60px 0; }
    }
    @media (max-width: 768px) {
      .nav-shell { min-height: 66px; flex-wrap: wrap; }
      .menu-toggle { display: block; margin-left: auto; }
      .nav-tools { margin-left: 0; }
      .nav-links { display: none; order: 3; width: 100%; margin: 0; padding: 0 0 12px; }
      .nav-links.open { display: flex; }
      .nav-link { flex: 1; text-align: center; }
      .nav-tools { order: 2; }
      .hero { min-height: 470px; }
      .hero::before { background-position: 58% center; }
      .hero-inner { padding-block: 60px; }
      .metrics { grid-template-columns: repeat(2, 1fr); gap: 17px 0; }
      .metric:nth-child(2) { border-right: 0; }
      .metric:nth-child(3) { padding-left: 0; }
      .feature-grid, .scene-layout, .showcase, .article-grid { grid-template-columns: 1fr; }
      .feature-side { grid-template-columns: 1fr 1fr; }
      .scene-copy { max-width: 680px; }
      .steps { grid-template-columns: repeat(2, 1fr); gap: 22px 12px; }
      .quote-grid { grid-template-columns: 1fr; }
      .trust-grid { grid-template-columns: 1fr 1fr; }
      .quick-grid { grid-template-columns: 1fr 1fr; }
      .showcase-image { min-height: 260px; }
      .article-feature { min-height: 230px; }
      .closing { padding: 28px; }
    }
    @media (max-width: 520px) {
      .container { width: calc(100% - 30px); }
      .brand { gap: 8px; font-size: 13px; }
      .brand-mark { width: 31px; height: 31px; }
      .language-pill { padding: 6px 9px; font-size: 11px; }
      .nav-tools { gap: 7px; }
      .nav-links { gap: 3px; }
      .nav-link { padding: 8px 5px; font-size: 12px; }
      .hero { min-height: 510px; align-items: end; }
      .hero::before { background-position: 60% center; }
      .hero-inner { padding-block: 75px 38px; }
      h1 { font-size: 35px; }
      .hero-copy { font-size: 14px; }
      .hero-meta { gap: 7px; }
      .hero-tag { padding: 5px 8px; font-size: 11px; }
      .section { padding: 49px 0; }
      .section-head { display: block; }
      h2 { font-size: 23px; }
      .section-link { display: inline-block; margin-top: 14px; }
      .metrics { gap: 16px 0; }
      .metric { padding-inline: 14px; }
      .metric strong { font-size: 21px; }
      .feature-panel { min-height: 210px; padding: 22px; }
      .feature-side { grid-template-columns: 1fr; }
      .topic-grid { gap: 9px; }
      .topic-card { min-height: 162px; padding: 14px; }
      .topic-card h3 { font-size: 14px; }
      .scene-list { grid-template-columns: 1fr; }
      .steps { grid-template-columns: 1fr 1fr; }
      .step { padding-right: 8px; }
      .showcase-content { padding: 22px; }
      .trust-grid, .quick-grid, .faq-list { grid-template-columns: 1fr; }
      .trust-item { padding: 15px 3px; }
      .closing { display: block; padding: 24px 20px; }
      .closing .button { margin-top: 19px; }
      .footer-main, .footer-bottom { flex-direction: column; }
      .footer-main { gap: 22px; }
      .footer-bottom { gap: 8px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
    }

/* roulang page: category1 */
:root {
      color-scheme: dark;
      --bg: #08111d;
      --bg-soft: #0c1826;
      --surface: rgba(17, 31, 47, .78);
      --surface-solid: #122235;
      --surface-light: #172b40;
      --text: #edf4f8;
      --muted: #a2b2bf;
      --faint: #718493;
      --line: rgba(180, 207, 221, .14);
      --cyan: #66e1d0;
      --blue: #73b7ff;
      --lime: #cbef85;
      --coral: #ff9c83;
      --radius: 10px;
      --radius-lg: 18px;
      --shadow: 0 18px 50px rgba(0, 0, 0, .27);
      --container: 1160px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 90px; }
    body {
      margin: 0;
      min-width: 320px;
      background: var(--bg);
      color: var(--text);
      font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
      font-size: 15px;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    a { color: inherit; text-decoration: none; transition: color .2s ease, background .2s ease, border-color .2s ease, transform .2s ease, box-shadow .2s ease; }
    img { display: block; max-width: 100%; }
    button, input { font: inherit; }
    button { color: inherit; }
    :focus-visible { outline: 2px solid var(--lime); outline-offset: 3px; }
    .container { width: min(var(--container), calc(100% - 48px)); margin-inline: auto; }

    .site-header {
      position: sticky;
      z-index: 50;
      top: 0;
      background: rgba(8, 17, 29, .88);
      border-bottom: 1px solid var(--line);
      backdrop-filter: blur(18px);
    }
    .nav-shell { min-height: 74px; display: flex; align-items: center; gap: 28px; }
    .brand { display: inline-flex; align-items: center; gap: 11px; min-width: max-content; font-size: 16px; font-weight: 750; }
    .brand-mark {
      display: grid; place-items: center; width: 35px; height: 35px;
      color: #07171a; background: var(--cyan); border-radius: 9px;
      font-size: 14px; font-weight: 900; box-shadow: 0 0 24px rgba(102, 225, 208, .22);
    }
    .nav-links { display: flex; align-items: center; gap: 7px; margin-left: auto; }
    .nav-link { padding: 9px 14px; color: var(--muted); font-size: 14px; border-radius: 7px; }
    .nav-link:hover, .nav-link:focus-visible { color: var(--text); background: rgba(255,255,255,.06); }
    .nav-link.active { color: var(--cyan); background: rgba(102,225,208,.09); }
    .nav-tools { display: flex; align-items: center; gap: 12px; }
    .language-pill {
      display: inline-flex; align-items: center; gap: 8px; padding: 7px 11px;
      border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font-size: 12px;
    }
    .language-pill b { color: var(--text); font-weight: 650; }
    .menu-toggle {
      display: none; width: 40px; height: 40px; padding: 9px;
      background: transparent; border: 1px solid var(--line); border-radius: 8px; cursor: pointer;
    }
    .menu-toggle span { display: block; height: 2px; margin: 4px 0; background: var(--text); border-radius: 2px; }

    .page-intro {
      position: relative;
      overflow: hidden;
      padding: 67px 0 54px;
      background:
        linear-gradient(115deg, rgba(102,225,208,.065), transparent 45%, rgba(115,183,255,.08)),
        #0c1826;
      border-bottom: 1px solid var(--line);
    }
    .page-intro::after {
      content: "";
      position: absolute;
      width: 320px;
      height: 320px;
      right: max(4%, calc((100vw - var(--container)) / 2));
      top: -190px;
      border: 1px solid rgba(115,183,255,.18);
      border-radius: 50%;
      box-shadow: 0 0 0 34px rgba(115,183,255,.025), 0 0 0 72px rgba(115,183,255,.02);
      pointer-events: none;
    }
    .breadcrumb { margin: 0 0 18px; color: var(--faint); font-size: 12px; }
    .breadcrumb a { color: var(--muted); }
    .breadcrumb a:hover { color: var(--cyan); }
    h1, h2, h3, p { overflow-wrap: anywhere; }
    h1 { max-width: 900px; margin: 0; font-size: clamp(32px, 4vw, 48px); line-height: 1.2; font-weight: 780; }
    .intro-copy { max-width: 800px; margin: 17px 0 0; color: #c0cdd5; font-size: 16px; line-height: 1.9; }
    .intro-meta { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 22px; }
    .tag {
      display: inline-flex; align-items: center; gap: 7px; padding: 6px 10px;
      color: #dbe7eb; background: rgba(8,17,29,.48); border: 1px solid rgba(214,235,243,.17);
      border-radius: 5px; font-size: 12px;
    }
    .tag-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--lime); }

    main { overflow: hidden; }
    .section { padding: 60px 0; border-bottom: 1px solid rgba(180,207,221,.09); }
    .section.alt { background: var(--bg-soft); }
    .section.deep { background: #0a1522; }
    .section-head { display: flex; justify-content: space-between; align-items: end; gap: 28px; margin-bottom: 26px; }
    .section-kicker { margin-bottom: 5px; color: var(--cyan); font-size: 11px; font-weight: 750; }
    h2 { margin: 0; font-size: 27px; line-height: 1.35; font-weight: 740; }
    .section-intro { max-width: 720px; margin: 10px 0 0; color: var(--muted); font-size: 14px; line-height: 1.85; }
    .button {
      display: inline-flex; align-items: center; justify-content: center; gap: 9px;
      min-height: 44px; padding: 10px 17px; border: 1px solid transparent; border-radius: 7px;
      background: var(--cyan); color: #06191b; font-size: 14px; font-weight: 750; cursor: pointer;
      box-shadow: 0 7px 25px rgba(102,225,208,.2);
    }
    .button:hover { transform: translateY(-2px); background: #8af0e2; box-shadow: 0 10px 30px rgba(102,225,208,.3); }
    .button.secondary { border-color: rgba(226,241,248,.28); background: rgba(13,28,41,.42); color: var(--text); box-shadow: none; }
    .button.secondary:hover { background: rgba(255,255,255,.1); border-color: rgba(226,241,248,.48); }
    .button.small { min-height: 37px; padding: 7px 12px; font-size: 13px; }

    .metrics { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); overflow: hidden; }
    .metric { min-height: 125px; padding: 23px 25px; border-right: 1px solid var(--line); }
    .metric:last-child { border-right: 0; }
    .metric-value { display: block; color: var(--cyan); font-size: 25px; line-height: 1.2; font-weight: 760; }
    .metric-label { display: block; margin-top: 9px; color: var(--muted); font-size: 13px; }
    .metric-note { display: block; margin-top: 3px; color: var(--faint); font-size: 11px; }

    .matrix { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
    .matrix-item {
      display: grid; grid-template-columns: 48px 1fr; gap: 16px; align-items: start;
      min-height: 148px; padding: 22px; background: var(--surface); border: 1px solid var(--line);
      border-radius: var(--radius); transition: transform .2s ease, border-color .2s ease, background .2s ease;
    }
    .matrix-item:hover { transform: translateY(-3px); border-color: rgba(102,225,208,.35); background: rgba(22,42,61,.9); }
    .matrix-icon { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 10px; color: var(--cyan); background: rgba(102,225,208,.1); font-size: 17px; font-weight: 800; }
    .matrix-item:nth-child(2) .matrix-icon { color: var(--blue); background: rgba(115,183,255,.11); }
    .matrix-item:nth-child(3) .matrix-icon { color: var(--lime); background: rgba(203,239,133,.1); }
    .matrix-item:nth-child(4) .matrix-icon { color: var(--coral); background: rgba(255,156,131,.1); }
    .matrix-item h3 { margin: 0 0 7px; font-size: 17px; line-height: 1.4; }
    .matrix-item p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }

    .comparison { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
    .compare-panel { padding: 26px; border-radius: var(--radius-lg); border: 1px solid var(--line); background: rgba(17,31,47,.72); }
    .compare-panel.emphasis { background: linear-gradient(135deg, rgba(24,50,65,.85), rgba(17,31,47,.78)); border-color: rgba(102,225,208,.25); }
    .compare-label { display: inline-flex; align-items: center; gap: 8px; color: var(--cyan); font-size: 12px; font-weight: 700; }
    .compare-panel h3 { margin: 12px 0 8px; font-size: 20px; }
    .compare-panel p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.85; }
    .compare-points { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
    .compare-points span { padding: 5px 9px; color: #c9d7dd; background: rgba(255,255,255,.045); border: 1px solid var(--line); border-radius: 5px; font-size: 11px; }

    .milestones { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
    .milestone { position: relative; padding: 0 22px 0 0; }
    .milestone::before { content: ""; position: absolute; left: 9px; right: -2px; top: 10px; height: 1px; background: var(--line); }
    .milestone:last-child::before { display: none; }
    .milestone-mark { position: relative; z-index: 1; width: 20px; height: 20px; margin-bottom: 18px; border: 1px solid rgba(102,225,208,.5); border-radius: 50%; background: #0c1826; }
    .milestone-mark::after { content: ""; position: absolute; inset: 5px; border-radius: 50%; background: var(--cyan); }
    .milestone:nth-child(2) .milestone-mark::after { background: var(--blue); }
    .milestone:nth-child(3) .milestone-mark::after { background: var(--lime); }
    .milestone:nth-child(4) .milestone-mark::after { background: var(--coral); }
    .milestone h3 { margin: 0 0 6px; font-size: 15px; }
    .milestone p { max-width: 230px; margin: 0; color: var(--muted); font-size: 12px; line-height: 1.8; }

    .article-list { display: grid; grid-template-columns: 1.15fr .85fr; gap: 14px; }
    .article-feature {
      min-height: 260px; display: flex; flex-direction: column; justify-content: end; padding: 27px;
      border: 1px solid var(--line); border-radius: var(--radius-lg);
      background: linear-gradient(145deg, rgba(19,47,60,.95), rgba(13,27,42,.95));
      box-shadow: var(--shadow);
    }
    .article-feature .article-type { color: var(--lime); }
    .article-type { color: var(--cyan); font-size: 11px; font-weight: 750; }
    .article-feature h3 { max-width: 560px; margin: 10px 0; font-size: 23px; line-height: 1.45; }
    .article-feature p { max-width: 580px; margin: 0; color: #b7c6cf; font-size: 13px; line-height: 1.8; }
    .article-stack { display: grid; gap: 14px; }
    .article-row {
      padding: 20px 21px; border: 1px solid var(--line); border-radius: var(--radius);
      background: var(--surface); transition: border-color .2s ease, transform .2s ease;
    }
    .article-row:hover { transform: translateX(3px); border-color: rgba(115,183,255,.36); }
    .article-row h3 { margin: 7px 0 5px; font-size: 16px; line-height: 1.5; }
    .article-row p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.75; }

    .standards-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 42px; align-items: start; }
    .standards-copy h2 { max-width: 430px; }
    .standards-copy p { max-width: 450px; margin: 12px 0 0; color: var(--muted); font-size: 14px; line-height: 1.9; }
    .standards-list { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 18px; }
    .standard-item { display: flex; gap: 11px; padding: 13px 0; border-bottom: 1px solid var(--line); }
    .check { flex: 0 0 auto; display: grid; place-items: center; width: 21px; height: 21px; margin-top: 1px; border-radius: 50%; color: #06191b; background: var(--lime); font-size: 12px; font-weight: 900; }
    .standard-item strong { display: block; font-size: 13px; }
    .standard-item span:last-child { display: block; margin-top: 3px; color: var(--muted); font-size: 11px; line-height: 1.65; }

    .faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
    details.faq-item { padding: 18px 20px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
    details.faq-item[open] { border-color: rgba(102,225,208,.3); }
    .faq-item summary { display: flex; justify-content: space-between; gap: 14px; cursor: pointer; list-style: none; font-size: 14px; font-weight: 650; }
    .faq-item summary::-webkit-details-marker { display: none; }
    .faq-item summary::after { content: "+"; color: var(--cyan); font-size: 19px; line-height: 1; }
    .faq-item[open] summary::after { content: "−"; }
    .faq-item p { margin: 12px 0 0; color: var(--muted); font-size: 13px; line-height: 1.8; }

    .closing-band { padding: 37px; display: flex; justify-content: space-between; align-items: center; gap: 25px; border: 1px solid rgba(102,225,208,.22); border-radius: var(--radius-lg); background: linear-gradient(110deg, rgba(18,47,57,.9), rgba(18,34,53,.94)); box-shadow: var(--shadow); }
    .closing-band h2 { font-size: 22px; }
    .closing-band p { max-width: 650px; margin: 8px 0 0; color: var(--muted); font-size: 13px; }

    .site-footer { padding: 40px 0 20px; background: #070e17; }
    .footer-main { display: flex; justify-content: space-between; gap: 45px; padding-bottom: 27px; }
    .footer-brand { max-width: 430px; }
    .footer-brand .brand { font-size: 15px; }
    .footer-brand p { margin: 13px 0 0; color: var(--muted); font-size: 12px; line-height: 1.8; }
    .footer-links { display: flex; flex-wrap: wrap; align-content: start; gap: 10px 22px; }
    .footer-links a { color: var(--muted); font-size: 12px; }
    .footer-links a:hover { color: var(--cyan); }
    .footer-bottom { display: flex; justify-content: space-between; gap: 16px; padding-top: 17px; border-top: 1px solid var(--line); color: var(--faint); font-size: 11px; }
    .age-note { color: #c2a99d; }

    @media (max-width: 1024px) {
      .nav-shell { gap: 18px; }
      .brand { font-size: 14px; }
      .metric { padding-inline: 18px; }
      .standards-layout { gap: 25px; }
    }
    @media (max-width: 768px) {
      .container { width: min(var(--container), calc(100% - 36px)); }
      .nav-shell { min-height: 68px; gap: 12px; }
      .brand { min-width: 0; font-size: 13px; }
      .brand-mark { flex: 0 0 34px; }
      .nav-tools { margin-left: auto; }
      .language-pill { padding: 6px 9px; }
      .menu-toggle { display: block; }
      .nav-links {
        display: none; position: absolute; top: 68px; left: 0; right: 0; margin: 0; padding: 12px 18px 16px;
        flex-direction: column; align-items: stretch; gap: 4px; background: rgba(8,17,29,.98);
        border-bottom: 1px solid var(--line); box-shadow: 0 16px 30px rgba(0,0,0,.25);
      }
      .nav-links.is-open { display: flex; }
      .nav-link { padding: 11px 12px; }
      .page-intro { padding: 49px 0 42px; }
      .section { padding: 48px 0; }
      .metrics { grid-template-columns: 1fr 1fr; }
      .metric:nth-child(2) { border-right: 0; }
      .metric:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
      .milestones { grid-template-columns: 1fr 1fr; row-gap: 28px; }
      .milestone:nth-child(2)::before { display: none; }
      .article-list { grid-template-columns: 1fr; }
      .standards-layout { grid-template-columns: 1fr; }
      .closing-band { align-items: flex-start; flex-direction: column; padding: 27px; }
    }
    @media (max-width: 520px) {
      .container { width: calc(100% - 30px); }
      .brand { gap: 8px; max-width: 230px; line-height: 1.3; }
      .brand-mark { width: 32px; height: 32px; flex-basis: 32px; }
      .language-pill { gap: 5px; font-size: 11px; }
      h1 { font-size: 32px; }
      h2 { font-size: 23px; }
      .intro-copy { font-size: 14px; }
      .section-head { display: block; }
      .section-head .button { margin-top: 18px; }
      .matrix, .comparison, .faq-list { grid-template-columns: 1fr; }
      .matrix-item { min-height: auto; padding: 18px; }
      .metrics { border-radius: 12px; }
      .metric { min-height: 108px; padding: 17px 14px; }
      .metric-value { font-size: 22px; }
      .milestones { column-gap: 14px; }
      .milestone { padding-right: 6px; }
      .milestone p { font-size: 11px; }
      .article-feature { min-height: 240px; padding: 21px; }
      .article-feature h3 { font-size: 20px; }
      .standards-list { grid-template-columns: 1fr; }
      .footer-main, .footer-bottom { flex-direction: column; }
      .footer-main { gap: 24px; }
      .footer-bottom { gap: 7px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; }
    }