:root {
      --paper: #f3f0e8;
      --ink: #121211;
      --blue: #1f4bff;
      --muted: #6c675c;
      --line: #d8d2c3;
      --soft: #e9e5da;
      --wrap: 1200px;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
    body {
      background: var(--paper);
      color: var(--ink);
      font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
      font-size: 15px;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    a { color: inherit; text-decoration: none; }
    button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
    ul { list-style: none; }
    .wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 32px; }
    .mono { font-family: "SFMono-Regular", Consolas, "Courier New", monospace; letter-spacing: 0.04em; }

    .progress { position: fixed; top: 0; left: 0; height: 2px; width: 0; background: var(--blue); z-index: 100; transition: width 0.1s linear; }

    .top {
      position: sticky; top: 0; z-index: 60;
      display: flex; align-items: center; gap: 28px;
      height: 76px; padding: 0 32px;
      background: rgba(243, 240, 232, 0.9);
      border-bottom: 1px solid var(--line);
      backdrop-filter: blur(14px);
    }
    .brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; letter-spacing: -0.02em; }
    .brand-mark {
      display: grid; place-items: center; width: 30px; height: 30px;
      background: var(--ink); color: var(--paper); font-size: 11px; font-weight: 700;
      letter-spacing: 0.08em;
    }
    .brand em { font-style: normal; color: var(--blue); font-size: 12px; letter-spacing: 0.12em; }
    .menu { display: flex; gap: 26px; margin-left: auto; font-size: 13px; }
    .menu a { position: relative; padding: 4px 0; }
    .menu a::after { content: ""; position: absolute; left: 0; bottom: 0; width: 0; height: 1px; background: var(--blue); transition: width 0.2s; }
    .menu a:hover { color: var(--blue); }
    .menu a:hover::after { width: 100%; }
    .top-cta { font-size: 13px; font-weight: 600; border-bottom: 1px solid var(--ink); padding-bottom: 2px; }
    .top-cta:hover { color: var(--blue); border-color: var(--blue); }
    .burger { display: none; width: 38px; height: 38px; border: 1px solid var(--ink); margin-left: auto; position: relative; }
    .burger span { position: absolute; left: 10px; right: 10px; height: 1px; background: var(--ink); transition: 0.2s; }
    .burger span:first-child { top: 15px; }
    .burger span:last-child { top: 21px; }
    .burger[aria-expanded="true"] span:first-child { top: 18px; transform: rotate(45deg); }
    .burger[aria-expanded="true"] span:last-child { top: 18px; transform: rotate(-45deg); }

    .hero { padding: 84px 0 68px; }
    .hero-grid { display: grid; grid-template-columns: 1.45fr 0.55fr; gap: 56px; align-items: end; }
    .kicker { font-family: "SFMono-Regular", Consolas, monospace; font-size: 10.5px; letter-spacing: 0.16em; color: var(--muted); display: flex; align-items: center; gap: 12px; }
    .kicker span { color: var(--blue); }
    .kicker::before { content: ""; width: 46px; height: 1px; background: var(--ink); }
    .hero h1 {
      margin: 26px 0 30px;
      font-size: clamp(52px, 8vw, 106px);
      line-height: 0.96;
      letter-spacing: -0.06em;
      font-weight: 700;
    }
    .hero h1 em { font-style: normal; color: var(--blue); position: relative; }
    .hero h1 em::after { content: ""; position: absolute; left: 0; right: 0; bottom: 6px; height: 10px; background: rgba(31, 75, 255, 0.14); z-index: -1; }
    .lead { max-width: 560px; font-size: 15.5px; color: #3f3c35; }
    .lead b { font-weight: 600; color: var(--ink); }
    .hero-actions { display: flex; align-items: center; gap: 26px; margin-top: 32px; flex-wrap: wrap; }
    .btn {
      display: inline-flex; align-items: center; gap: 26px;
      background: var(--ink); color: var(--paper);
      padding: 14px 22px; font-size: 13px; font-weight: 600;
      transition: background 0.2s, transform 0.2s;
    }
    .btn span { font-size: 16px; }
    .btn:hover { background: var(--blue); transform: translate(-2px, -2px); }
    .text-link { font-size: 12.5px; color: var(--muted); border-bottom: 1px solid var(--line); padding-bottom: 3px; }
    .text-link:hover { color: var(--blue); border-color: var(--blue); }
    .micro { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 30px; font-size: 11.5px; color: var(--muted); }
    .micro li { display: flex; align-items: center; gap: 6px; }
    .micro li::before { content: ""; width: 5px; height: 5px; background: var(--blue); border-radius: 50%; }

    .hero-side { border-left: 1px solid var(--line); padding-left: 30px; padding-bottom: 4px; }
    .index-num {
      font-size: 78px; line-height: 1; font-weight: 700; letter-spacing: -0.06em;
      color: transparent; -webkit-text-stroke: 1px var(--blue);
    }
    .hero-side > p { margin: 16px 0 26px; font-size: 12.5px; color: var(--muted); }
    .hero-stats { display: grid; gap: 14px; }
    .hero-stats div { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; border-top: 1px solid var(--line); padding-top: 11px; }
    .hero-stats dt { font-size: 10.5px; color: var(--muted); font-family: "SFMono-Regular", Consolas, monospace; letter-spacing: 0.08em; }
    .hero-stats dd { font-size: 16px; font-weight: 700; letter-spacing: -0.02em; }

    .ticker { overflow: hidden; background: var(--blue); color: #fff; border-top: 1px solid var(--blue); }
    .ticker-track { display: flex; width: max-content; animation: slide 26s linear infinite; }
    .ticker span { padding: 9px 0; font-size: 11px; letter-spacing: 0.12em; font-family: "SFMono-Regular", Consolas, monospace; white-space: nowrap; }
    .ticker span i { font-style: normal; margin: 0 22px; color: rgba(255,255,255,0.55); }
    @keyframes slide { to { transform: translateX(-50%); } }

    .section { padding: 82px 0; border-top: 1px solid var(--line); }
    .section-head { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 40px; margin-bottom: 38px; align-items: end; }
    .sec-label { font-family: "SFMono-Regular", Consolas, monospace; font-size: 10.5px; letter-spacing: 0.14em; color: var(--blue); margin-bottom: 14px; }
    .section-head h2 { font-size: clamp(30px, 4vw, 46px); line-height: 1.12; letter-spacing: -0.045em; font-weight: 700; }
    .section-head p { font-size: 13.5px; color: var(--muted); max-width: 440px; justify-self: end; }
    .section-head p b { color: var(--ink); font-weight: 600; }

    .feature-rows { border-bottom: 1px solid var(--line); }
    .fr {
      display: grid; grid-template-columns: 72px 1fr 1.15fr; gap: 24px;
      padding: 26px 18px 26px 10px; border-top: 1px solid var(--line);
      transition: background 0.22s, color 0.22s, padding 0.22s;
    }
    .fr:hover { background: var(--ink); color: var(--paper); padding-left: 22px; }
    .fr-num { font-family: "SFMono-Regular", Consolas, monospace; font-size: 11px; color: var(--blue); padding-top: 5px; }
    .fr h3 { font-size: 21px; font-weight: 600; letter-spacing: -0.025em; }
    .fr p { font-size: 13px; color: var(--muted); }
    .fr:hover p { color: #c5c0b4; }

    .nodes { width: 100%; border-collapse: collapse; font-size: 12.5px; }
    .nodes th { text-align: left; font-family: "SFMono-Regular", Consolas, monospace; font-size: 9.5px; letter-spacing: 0.12em; color: var(--muted); font-weight: 400; padding: 0 10px 10px; border-bottom: 1px solid var(--ink); }
    .nodes td { padding: 14px 10px; border-bottom: 1px solid var(--line); }
    .nodes tr:hover td { background: var(--soft); }
    .nodes .city { font-weight: 600; }
    .nodes .code { font-family: "SFMono-Regular", Consolas, monospace; font-size: 10px; color: var(--muted); }
    .nodes .ping { color: var(--blue); font-weight: 700; }
    .nodes .tag { display: inline-block; font-size: 9.5px; border: 1px solid var(--line); padding: 2px 7px; margin-right: 4px; color: var(--muted); }
    .table-note { display: flex; justify-content: space-between; gap: 20px; margin-top: 16px; font-size: 11px; color: var(--muted); flex-wrap: wrap; }

    .price-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; flex-wrap: wrap; margin-bottom: 34px; }
    .price-head h2 { font-size: clamp(30px, 4vw, 46px); letter-spacing: -0.045em; line-height: 1.1; }
    .cycle { display: inline-flex; border: 1px solid var(--ink); }
    .cycle button { padding: 9px 18px; font-size: 11.5px; font-family: "SFMono-Regular", Consolas, monospace; }
    .cycle button.is-on { background: var(--ink); color: var(--paper); }
    .plans { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
    .plan { border: 1px solid var(--ink); padding: 30px; display: flex; flex-direction: column; min-height: 380px; }
    .plan.dark { background: var(--blue); border-color: var(--blue); color: #fff; }
    .plan-top { display: flex; justify-content: space-between; align-items: center; font-size: 11px; font-family: "SFMono-Regular", Consolas, monospace; letter-spacing: 0.08em; }
    .plan h3 { font-size: 26px; margin: 22px 0 6px; letter-spacing: -0.03em; }
    .plan .desc { font-size: 12.5px; color: var(--muted); min-height: 40px; }
    .plan.dark .desc { color: rgba(255,255,255,0.72); }
    .price { display: flex; align-items: baseline; gap: 6px; margin: 22px 0 6px; }
    .price .cur { font-size: 18px; }
    .price .num { font-size: 60px; font-weight: 700; letter-spacing: -0.06em; line-height: 1; }
    .price .unit { font-size: 12px; color: var(--muted); }
    .plan.dark .price .unit { color: rgba(255,255,255,0.7); }
    .plan .note { font-size: 11px; color: var(--muted); }
    .plan.dark .note { color: rgba(255,255,255,0.72); }
    .plan ul { margin: 24px 0 28px; display: grid; gap: 9px; font-size: 12.5px; }
    .plan li { display: flex; gap: 8px; }
    .plan li::before { content: "—"; color: var(--blue); }
    .plan.dark li::before { color: #fff; }
    .plan .btn { margin-top: auto; justify-content: space-between; }
    .plan.dark .btn { background: var(--paper); color: var(--ink); }
    .plan.dark .btn:hover { background: var(--ink); color: var(--paper); }

    .faq { display: grid; gap: 0; border-top: 1px solid var(--ink); }
    .faq details { border-bottom: 1px solid var(--line); }
    .faq summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; gap: 20px; padding: 20px 4px; font-size: 15px; font-weight: 600; }
    .faq summary::-webkit-details-marker { display: none; }
    .faq summary::after { content: "+"; font-size: 20px; font-weight: 400; color: var(--blue); line-height: 1; }
    .faq details[open] summary::after { content: "−"; }
    .faq .answer { padding: 0 40px 22px 4px; font-size: 13px; color: var(--muted); max-width: 760px; }

    .about-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 50px; }
    .about-grid h2 { font-size: clamp(28px, 3.6vw, 40px); letter-spacing: -0.04em; line-height: 1.2; }
    .about-grid h2 em { font-style: normal; color: var(--blue); }
    .about-copy { margin-top: 20px; font-size: 13.5px; color: #454138; display: grid; gap: 12px; }
    .contact { border-top: 1px solid var(--ink); padding-top: 18px; }
    .contact dl { display: grid; gap: 12px; }
    .contact div { display: flex; justify-content: space-between; gap: 18px; border-bottom: 1px solid var(--line); padding-bottom: 10px; font-size: 12px; }
    .contact dt { color: var(--muted); font-family: "SFMono-Regular", Consolas, monospace; font-size: 10px; letter-spacing: 0.06em; }
    .contact dd { text-align: right; }
    .contact a { border-bottom: 1px solid var(--line); }
    .contact a:hover { color: var(--blue); border-color: var(--blue); }

    footer { background: var(--ink); color: var(--paper); padding: 46px 0 28px; margin-top: 0; }
    .ft-top { display: flex; justify-content: space-between; gap: 30px; align-items: flex-start; flex-wrap: wrap; }
    .ft-brand { font-size: 30px; letter-spacing: -0.04em; font-weight: 700; }
    .ft-brand span { color: var(--blue); }
    .ft-links { display: flex; gap: 22px; font-size: 12px; color: #b9b5aa; flex-wrap: wrap; }
    .ft-links a:hover { color: #fff; }
    .ft-bottom { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-top: 40px; padding-top: 18px; border-top: 1px solid #33322e; font-size: 10.5px; color: #8d897f; font-family: "SFMono-Regular", Consolas, monospace; letter-spacing: 0.04em; }

    .reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.6s, transform 0.6s; }
    .reveal.in { opacity: 1; transform: none; }

    @media (max-width: 980px) {
      .hero-grid { grid-template-columns: 1fr; gap: 38px; }
      .hero-side { border-left: 0; border-top: 1px solid var(--line); padding-left: 0; padding-top: 24px; }
      .index-num { font-size: 56px; }
      .hero-stats { grid-template-columns: repeat(3, 1fr); }
      .hero-stats div { display: block; }
      .section-head { grid-template-columns: 1fr; gap: 18px; }
      .section-head p { justify-self: start; }
      .fr { grid-template-columns: 54px 1fr; }
      .fr p { grid-column: 2; }
      .about-grid { grid-template-columns: 1fr; gap: 30px; }
      .menu, .top-cta { display: none; }
      .top { gap: 0; }
      .burger { display: block; }
      .menu.open {
        display: flex; position: absolute; top: 76px; left: 0; right: 0;
        flex-direction: column; gap: 0; background: var(--paper);
        border-bottom: 1px solid var(--line); padding: 8px 32px 20px; margin: 0;
      }
      .menu.open a { padding: 13px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
    }
    @media (max-width: 640px) {
      .wrap { padding: 0 20px; }
      .top { padding: 0 20px; height: 66px; }
      .menu.open { top: 66px; padding: 8px 20px 20px; }
      .hero { padding: 56px 0 46px; }
      .hero h1 { margin: 20px 0 22px; }
      .hero-stats { grid-template-columns: 1fr; }
      .hero-stats div { display: flex; }
      .section { padding: 58px 0; }
      .fr { padding: 22px 6px; gap: 14px; }
      .fr h3 { font-size: 18px; }
      .plans { grid-template-columns: 1fr; }
      .plan { min-height: 0; padding: 24px; }
      .nodes th:nth-child(4), .nodes td:nth-child(4), .nodes th:nth-child(5), .nodes td:nth-child(5) { display: none; }
      .table-note { display: none; }
      .ft-top { flex-direction: column; }
      .ft-bottom { flex-direction: column; }
    }
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      .ticker-track { animation: none; }
      .reveal { opacity: 1; transform: none; transition: none; }
      * { transition-duration: 0.001ms !important; }
    }
  

  

  

  

  

  /* ============ 多页子页面 ============ */
  .pg-hero { padding: 52px 0 38px; border-bottom: 1px solid #d8d2c3; background: #efece3; }
  .pg-hero .wrap { max-width: 1100px; margin: 0 auto; padding: 0 22px; }
  .crumb { font-size: 11.5px; letter-spacing: .14em; text-transform: uppercase; color: #6c675c; margin-bottom: 18px; }
  .crumb a { color: inherit; text-decoration: none; }
  .crumb a:hover { color: #1f4bff; }
  .crumb i { font-style: normal; opacity: .45; margin: 0 8px; }
  .pg-hero h1 { font-family: "Helvetica Neue","PingFang SC",sans-serif; font-size: clamp(30px, 5vw, 52px); line-height: 1.14; letter-spacing: -.015em; color: #121211; margin-bottom: 16px; }
  .pg-hero .lead { max-width: 730px; font-size: 15.5px; line-height: 1.85; color: #6c675c; }
  .pg-h1-mark { display: block; font-family: "Helvetica Neue","PingFang SC",sans-serif; font-size: 11.5px; font-weight: 600; letter-spacing: .2em; color: #1f4bff; margin-bottom: 12px; }
  .pg-hero .hero-meta { display: flex; flex-wrap: wrap; gap: 10px 22px; margin-top: 20px; font-size: 12px; letter-spacing: .06em; color: #6c675c; }
  .pg-hero .hero-meta b { color: #121211; font-weight: 600; }
  .pg-sec { padding: 46px 0; border-bottom: 1px solid #d8d2c3; }
  .pg-sec:last-of-type { border-bottom: 0; }
  .pg-sec .wrap { max-width: 1100px; margin: 0 auto; padding: 0 22px; }
  .pg-sec h2 { font-family: "Helvetica Neue","PingFang SC",sans-serif; font-size: clamp(22px, 3vw, 30px); line-height: 1.25; color: #121211; margin-bottom: 16px; }
  .pg-sec h3 { font-size: 17px; color: #121211; margin-bottom: 8px; }
  .pg-sec p { color: #6c675c; line-height: 1.9; margin-bottom: 12px; }
  .pg-sec p:last-child { margin-bottom: 0; }
  .pg-kicker { font-size: 11.5px; letter-spacing: .16em; text-transform: uppercase; color: #1f4bff; margin-bottom: 10px; }
  .pg-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(238px, 1fr)); }
  .pg-card { background: #fffdf7; border: 1px solid #d8d2c3; border-radius: 0px; padding: 20px 22px; }
  .pg-card h3 { margin-bottom: 8px; }
  .pg-card p { font-size: 13.5px; margin: 0; }
  .pg-tag { display: inline-block; font-size: 10.5px; letter-spacing: .12em; text-transform: uppercase; color: #1f4bff; border: 1px solid #1f4bff; border-radius: 99px; padding: 2px 10px; margin-bottom: 10px; }
  .pg-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .pg-table { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 520px; }
  .pg-table th, .pg-table td { padding: 11px 12px; border-bottom: 1px solid #d8d2c3; text-align: left; vertical-align: top; }
  .pg-table th { font-size: 10.5px; letter-spacing: .12em; text-transform: uppercase; color: #6c675c; font-weight: 600; }
  .pg-table td { color: #121211; }
  .pg-table td span { color: #6c675c; }
  .pg-table tbody tr:hover td { background: rgba(31,75,255,.045); }
  .pg-steps { list-style: none; display: grid; gap: 16px; counter-reset: pgstep; }
  .pg-steps li { position: relative; padding-left: 48px; }
  .pg-steps li::before { counter-increment: pgstep; content: counter(pgstep, decimal-leading-zero); position: absolute; left: 0; top: -2px; width: 30px; height: 30px; display: flex; align-items: center; justify-content: center; font-family: "Helvetica Neue","PingFang SC",sans-serif; font-size: 12px; color: #1f4bff; border: 1px solid #1f4bff; border-radius: 50%; }
  .pg-steps b { display: block; color: #121211; margin-bottom: 4px; font-size: 15px; }
  .pg-steps span { color: #6c675c; font-size: 13.5px; line-height: 1.8; }
  .pg-faq details { border-bottom: 1px solid #d8d2c3; padding: 15px 0; }
  .pg-faq details:first-of-type { border-top: 1px solid #d8d2c3; }
  .pg-faq summary { cursor: pointer; list-style: none; font-weight: 600; color: #121211; font-size: 15px; display: flex; gap: 10px; align-items: baseline; }
  .pg-faq summary::-webkit-details-marker { display: none; }
  .pg-faq summary::before { content: "+"; color: #1f4bff; font-family: "Helvetica Neue","PingFang SC",sans-serif; }
  .pg-faq details[open] summary::before { content: "–"; }
  .pg-faq p { margin: 10px 0 0 22px; font-size: 13.5px; }
  .pg-cta { margin: 44px 0 6px; padding: 26px 28px; border: 1px solid #1f4bff; border-radius: 0px; background: #fffdf7; display: flex; flex-wrap: wrap; gap: 16px; align-items: center; justify-content: space-between; }
  .pg-cta b { display: block; font-family: "Helvetica Neue","PingFang SC",sans-serif; font-size: 19px; color: #121211; }
  .pg-cta p { margin: 5px 0 0; font-size: 13px; }
  .pg-btns { display: flex; flex-wrap: wrap; gap: 10px; }
  .pg-btn { display: inline-block; padding: 11px 20px; border-radius: 0px; background: #1f4bff; color: #ffffff; text-decoration: none; font-size: 13.5px; font-weight: 700; border: 1px solid #1f4bff; transition: transform .15s ease, opacity .15s ease; }
  .pg-btn:hover { transform: translateY(-1px); opacity: .92; }
  .pg-btn.ghost { background: transparent; color: #121211; border-color: #d8d2c3; }
  .pg-stat { display: flex; flex-wrap: wrap; gap: 16px 34px; margin: 6px 0 20px; }
  .pg-stat b { display: block; font-family: "Helvetica Neue","PingFang SC",sans-serif; font-size: 30px; line-height: 1.1; color: #1f4bff; }
  .pg-stat span { font-size: 11.5px; letter-spacing: .08em; color: #6c675c; }
  .pg-note { font-size: 12px; color: #6c675c; margin-top: 12px; line-height: 1.8; }
  .pg-related { margin: 40px 0 10px; padding-top: 20px; border-top: 1px solid #d8d2c3; }
  .pg-related p { font-size: 11.5px; letter-spacing: .14em; text-transform: uppercase; color: #6c675c; margin-bottom: 12px; }
  .pg-related a { display: inline-block; margin: 0 18px 10px 0; color: #121211; text-decoration: none; font-size: 14px; border-bottom: 1px solid #1f4bff; padding-bottom: 2px; }
  .pg-related a:hover { color: #1f4bff; }
  .pg-index-links { padding: 46px 0 54px; border-top: 1px solid #d8d2c3; background: #efece3; }
  .pg-index-links .wrap { max-width: 1100px; margin: 0 auto; padding: 0 22px; }
  .pg-index-links h2 { font-family: "Helvetica Neue","PingFang SC",sans-serif; font-size: 24px; color: #121211; margin: 6px 0 20px; }
  .pg-index-links a.pg-card { display: block; text-decoration: none; transition: transform .18s ease, border-color .18s ease; }
  .pg-index-links a.pg-card:hover { transform: translateY(-2px); border-color: #1f4bff; }
  .pg-index-links a.pg-card b { display: block; color: #121211; font-size: 15px; margin-bottom: 6px; }
  .pg-index-links a.pg-card span { color: #6c675c; font-size: 13px; line-height: 1.7; display: block; }
  @media (max-width: 700px) {
    .pg-hero { padding: 34px 0 26px; }
    .pg-sec { padding: 32px 0; }
    .pg-hero h1 { font-size: 30px; }
    .pg-hero .lead { font-size: 14.5px; }
    .pg-cta { padding: 20px; }
    .pg-stat b { font-size: 24px; }
  }


  .pg-hero { border-bottom: 2px solid #121211; }
  .pg-hero h1 { font-weight: 600; letter-spacing: -.035em; }
  .pg-kicker { font-weight: 700; }
  .pg-sec h2 { letter-spacing: -.025em; font-weight: 600; }
  .pg-table th { border-bottom: 2px solid #121211; color: #121211; }
  .pg-card { border-radius: 0; }
  .pg-btn { letter-spacing: .02em; }
  .pg-index-links h2 { letter-spacing: -.02em; }