:root {
      color-scheme: light;
      --ink: #14213d;
      --muted: #596b88;
      --blue: #1454d1;
      --blue-deep: #103b99;
      --cyan: #15a9c7;
      --line: #dce5f2;
      --paper: #ffffff;
      --wash: #f3f7fd;
      --green: #18765e;
      --container: 1160px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 86px; }
    body {
      margin: 0;
      color: var(--ink);
      background: #f5f8ff;
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif;
      line-height: 1.7;
    }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font: inherit; }
    button, a, input, select, textarea { -webkit-tap-highlight-color: transparent; }
    img { max-width: 100%; height: auto; }
    .container { width: min(var(--container), calc(100% - 40px)); margin-inline: auto; }
    .site-header {
      position: sticky; top: 0; z-index: 20;
      background: rgba(255,255,255,.96);
      border-bottom: 1px solid var(--line);
      backdrop-filter: blur(12px);
    }
    .header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
    .brand { display: inline-flex; align-items: center; flex: 0 0 auto; }
    .brand img { display: block; width: 146px; max-height: 48px; object-fit: contain; }
    .nav-area { display: flex; align-items: center; gap: 20px; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; flex-wrap: wrap; }
    .nav-links a { color: #344560; font-size: 13px; padding: 8px 7px; border-radius: 5px; transition: color .2s, background .2s; }
    .nav-links a:hover { color: var(--blue); background: #edf3ff; }
    .nav-cta, .button {
      display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      min-height: 44px; padding: 10px 18px; border: 1px solid var(--blue);
      border-radius: 5px; color: #fff; background: var(--blue); font-weight: 700;
      transition: transform .2s, box-shadow .2s, background .2s;
    }
    .nav-cta { min-height: 38px; padding: 7px 14px; font-size: 13px; white-space: nowrap; }
    .button:hover, .nav-cta:hover { color: #fff; background: var(--blue-deep); box-shadow: 0 8px 20px rgba(20,84,209,.2); transform: translateY(-2px); }
    .button.secondary { color: var(--blue-deep); background: #fff; border-color: #9bb6e9; }
    .button.secondary:hover { color: var(--blue-deep); background: #eef4ff; }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 5px; background: #fff; color: var(--ink); cursor: pointer; }
    .hero {
      position: relative; overflow: hidden; padding: 74px 0 62px;
      background: linear-gradient(118deg, #edf4ff 0%, #f8fbff 56%, #e8f8fb 100%);
      border-bottom: 1px solid #dce8f5;
    }
    .hero:before {
      content: ""; position: absolute; width: 410px; height: 410px; right: -125px; top: -180px;
      border: 1px solid rgba(20,84,209,.16); border-radius: 50%;
      box-shadow: 0 0 0 36px rgba(20,84,209,.035), 0 0 0 78px rgba(20,84,209,.025);
      pointer-events: none;
    }
    .hero-grid { position: relative; display: grid; grid-template-columns: minmax(0,1.25fr) minmax(280px,.75fr); align-items: center; gap: 54px; }
    .eyebrow { color: var(--blue); font-size: 13px; font-weight: 800; letter-spacing: 0; text-transform: uppercase; }
    h1 { max-width: 700px; margin: 13px 0 18px; font-size: clamp(36px, 5vw, 62px); line-height: 1.14; letter-spacing: 0; }
    .hero-copy { max-width: 650px; margin: 0; color: #465b7a; font-size: 17px; }
    .hero-actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
    .hero-note { margin-top: 17px; color: #65758e; font-size: 13px; }
    .hero-board { padding: 22px; border: 1px solid #cad9ef; background: rgba(255,255,255,.72); box-shadow: 0 18px 45px rgba(27,66,130,.09); }
    .board-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
    .board-top strong { font-size: 15px; }
    .status-label { color: var(--green); font-size: 12px; font-weight: 700; }
    .signal { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 12px; padding-top: 16px; }
    .signal-item { padding: 13px; background: #f2f6fd; }
    .signal-item b { display: block; color: var(--blue-deep); font-size: 20px; line-height: 1.3; }
    .signal-item span { color: var(--muted); font-size: 12px; }
    .board-foot { margin: 15px 0 0; color: #50617b; font-size: 13px; }
    .section { padding: 70px 0; }
    .section.alt { background: #edf3fb; border-block: 1px solid #e0e8f3; }
    .section-head { display: flex; justify-content: space-between; align-items: end; gap: 25px; margin-bottom: 30px; }
    .section-head > div { max-width: 760px; }
    .section-kicker { margin: 0 0 7px; color: var(--blue); font-size: 12px; font-weight: 800; }
    h2 { margin: 0; font-size: 30px; line-height: 1.3; letter-spacing: 0; }
    .section-intro { margin: 10px 0 0; color: var(--muted); }
    .text-link { color: var(--blue); font-weight: 700; }
    .text-link:hover { text-decoration: underline; }
    .metric-strip { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); border-block: 1px solid var(--line); background: #fff; }
    .metric { padding: 23px 20px; border-right: 1px solid var(--line); }
    .metric:last-child { border-right: 0; }
    .metric strong { display: block; color: var(--blue-deep); font-size: 23px; }
    .metric span { color: var(--muted); font-size: 13px; }
    .about-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 46px; align-items: start; }
    .about-copy p { margin: 0 0 14px; color: #4d5f79; }
    .check-list { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 12px 20px; margin: 22px 0 0; padding: 0; list-style: none; }
    .check-list li { display: flex; gap: 10px; color: #344760; }
    .check-list li:before { content: "✓"; color: var(--cyan); font-weight: 900; }
    .platform-brief { padding: 22px 24px; border-left: 3px solid var(--cyan); background: #fff; }
    .platform-brief h3 { margin: 0 0 10px; font-size: 18px; }
    .platform-brief p { margin: 0; color: var(--muted); font-size: 14px; }
    .feature-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 14px; }
    .feature { padding: 21px; border: 1px solid var(--line); background: #fff; transition: transform .2s, box-shadow .2s, border-color .2s; }
    .feature:hover { transform: translateY(-3px); border-color: #a7bee8; box-shadow: 0 12px 26px rgba(31,67,119,.08); }
    .feature-index { display: inline-block; margin-bottom: 12px; color: var(--cyan); font-size: 12px; font-weight: 800; }
    .feature h3 { margin: 0 0 8px; font-size: 17px; }
    .feature p { margin: 0; color: var(--muted); font-size: 14px; }
    .workflow { display: grid; grid-template-columns: repeat(5,minmax(0,1fr)); gap: 0; counter-reset: step; }
    .workflow-item { position: relative; padding: 20px 18px 18px 0; border-top: 2px solid #b8cce9; counter-increment: step; }
    .workflow-item:before { content: "0" counter(step); display: inline-flex; align-items: center; justify-content: center; width: 34px; height: 34px; margin-top: -39px; margin-bottom: 13px; border: 2px solid var(--blue); border-radius: 50%; color: var(--blue); background: #fff; font-size: 11px; font-weight: 800; }
    .workflow-item h3 { margin: 0 0 6px; font-size: 16px; }
    .workflow-item p { margin: 0; color: var(--muted); font-size: 13px; }
    .service-row { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr); gap: 38px; align-items: center; }
    .service-row + .service-row { margin-top: 45px; }
    .service-row.reverse .service-content { order: 2; }
    .service-row.reverse .service-visual { order: 1; }
    .service-visual { padding: 13px; background: #dceaff; }
    .service-visual img { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
    .service-content h3 { margin: 0 0 11px; font-size: 23px; }
    .service-content p { margin: 0 0 14px; color: var(--muted); }
    .service-list { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0 0; padding: 0; list-style: none; }
    .service-list li { padding: 5px 10px; border: 1px solid #ccdaed; color: #3d5475; background: #fff; font-size: 12px; }
    .solution-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 1px; border: 1px solid var(--line); background: var(--line); }
    .solution { padding: 21px; background: #fff; }
    .solution h3 { margin: 0 0 7px; font-size: 16px; }
    .solution p { margin: 0; color: var(--muted); font-size: 13px; }
    .network-band { display: flex; flex-wrap: wrap; gap: 10px; padding: 22px; border: 1px solid var(--line); background: #fff; }
    .network-band span { padding: 7px 12px; color: #294365; background: #edf4ff; font-size: 13px; }
    .review { display: flex; flex-direction: column; min-height: 100%; padding: 20px; border-top: 2px solid #32a8c1; background: #fff; }
    .review p { flex: 1; margin: 0 0 17px; color: #465b77; font-size: 14px; }
    .review strong { font-size: 14px; }
    .review span { color: #75839a; font-size: 12px; }
    .review-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 14px; }
    .compare-layout { display: grid; grid-template-columns: 260px minmax(0,1fr); gap: 24px; align-items: start; }
    .score-panel { padding: 23px; color: #fff; background: var(--blue-deep); }
    .score-panel small { color: #d6e4ff; }
    .score-panel strong { display: block; margin: 8px 0 4px; font-size: 44px; line-height: 1; }
    .stars { color: #ffdb6e; letter-spacing: 0; font-size: 21px; }
    .score-panel p { margin: 13px 0 0; color: #e1ebff; font-size: 13px; }
    .table-wrap { overflow-x: auto; border: 1px solid var(--line); background: #fff; }
    table { width: 100%; border-collapse: collapse; min-width: 640px; }
    th, td { padding: 13px 15px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; font-size: 13px; }
    th { color: #263b5d; background: #edf3fb; }
    td:first-child { color: #263b5d; font-weight: 700; }
    tr:last-child td { border-bottom: 0; }
    .positive { color: var(--green); font-weight: 700; }
    .article-list { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 0 24px; border-top: 1px solid var(--line); }
    .article-item { display: flex; justify-content: space-between; gap: 20px; padding: 15px 0; border-bottom: 1px solid var(--line); }
    .article-item a { color: #253d61; font-weight: 700; }
    .article-item a:hover { color: var(--blue); }
    .article-item span { flex: 0 0 auto; color: #75839a; font-size: 12px; }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 9px; }
    .tag-cloud span { padding: 7px 11px; border: 1px solid #cbd9eb; color: #3e5575; background: #fff; font-size: 13px; }
    .rating-note { margin: 15px 0 0; color: var(--muted); font-size: 13px; }
    .faq-list { border-top: 1px solid var(--line); }
    .faq-list details { border-bottom: 1px solid var(--line); background: rgba(255,255,255,.56); }
    .faq-list summary { position: relative; padding: 17px 42px 17px 3px; cursor: pointer; color: #253a5a; font-weight: 700; list-style: none; }
    .faq-list summary::-webkit-details-marker { display: none; }
    .faq-list summary:after { content: "+"; position: absolute; right: 8px; top: 12px; color: var(--blue); font-size: 23px; font-weight: 400; }
    .faq-list details[open] summary:after { content: "−"; }
    .faq-list details p { margin: -3px 40px 17px 3px; color: var(--muted); font-size: 14px; }
    .contact-grid { display: grid; grid-template-columns: minmax(0,1.1fr) minmax(280px,.9fr); gap: 36px; align-items: start; }
    .form-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 14px; }
    .field { display: flex; flex-direction: column; gap: 6px; }
    .field.full { grid-column: 1 / -1; }
    .field label { color: #344760; font-size: 13px; font-weight: 700; }
    .field input, .field select, .field textarea { width: 100%; min-height: 44px; padding: 10px 12px; border: 1px solid #cbd7e7; border-radius: 4px; outline: none; color: var(--ink); background: #fff; }
    .field textarea { min-height: 120px; resize: vertical; }
    .field input:focus, .field select:focus, .field textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(20,84,209,.1); }
    .contact-info { padding: 22px; border: 1px solid var(--line); background: #fff; }
    .contact-info h3 { margin: 0 0 10px; }
    .contact-info p { margin: 7px 0; color: var(--muted); font-size: 14px; }
    .contact-info a { color: var(--blue); }
    .qr { width: 150px; margin-top: 14px; }
    .join-band { display: flex; justify-content: space-between; align-items: center; gap: 22px; padding: 24px; border-left: 4px solid var(--cyan); background: #e8f4fa; }
    .join-band h3 { margin: 0 0 4px; font-size: 19px; }
    .join-band p { margin: 0; color: var(--muted); font-size: 14px; }
    .site-footer { padding: 28px 0 22px; color: #243750; background: #e7eef7; border-top: 1px solid #d5e0ee; }
    .footer-top { display: flex; justify-content: space-between; align-items: start; gap: 28px; }
    .footer-brand img { display: block; width: 132px; max-height: 42px; object-fit: contain; }
    .footer-brand p { max-width: 480px; margin: 10px 0 0; color: #566981; font-size: 13px; }
    .footer-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 7px 15px; max-width: 520px; }
    .footer-links a { color: #304664; font-size: 13px; }
    .footer-links a:hover { color: var(--blue); text-decoration: underline; }
    .footer-bottom { display: flex; justify-content: space-between; gap: 16px; margin-top: 22px; padding-top: 14px; border-top: 1px solid #cbd6e4; color: #607189; font-size: 12px; }
    .floating-contact { position: fixed; right: 18px; bottom: 20px; z-index: 15; display: grid; gap: 8px; }
    .floating-contact a { display: grid; place-items: center; width: 48px; height: 48px; border: 1px solid #b7c9e4; border-radius: 50%; color: #fff; background: var(--blue); box-shadow: 0 6px 18px rgba(20,60,126,.2); font-size: 12px; font-weight: 700; }
    .floating-contact a.top { color: var(--blue-deep); background: #fff; }
    .reveal { opacity: 0; transform: translateY(14px); transition: opacity .55s ease, transform .55s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }
    @media (prefers-reduced-motion: reduce) {
      *, *:before, *:after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
      .reveal { opacity: 1; transform: none; }
    }
    @media (max-width: 1080px) {
      .nav-area { gap: 10px; }
      .nav-links a { padding-inline: 5px; font-size: 12px; }
      .nav-cta { display: none; }
    }
    @media (max-width: 820px) {
      .header-inner { min-height: 64px; }
      .menu-toggle { display: inline-grid; place-items: center; }
      .nav-area { gap: 10px; }
      .nav-links { display: none; position: absolute; top: 64px; left: 0; right: 0; padding: 10px 20px 16px; border-bottom: 1px solid var(--line); background: #fff; box-shadow: 0 12px 18px rgba(20,48,86,.08); }
      .nav-links.open { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); }
      .nav-links a { padding: 9px 7px; font-size: 13px; }
      .hero { padding: 54px 0 48px; }
      .hero-grid, .about-grid, .service-row, .contact-grid { grid-template-columns: 1fr; }
      .hero-grid { gap: 30px; }
      .hero-board { max-width: 510px; }
      .section { padding: 56px 0; }
      .feature-grid, .solution-grid, .review-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
      .workflow { grid-template-columns: repeat(5,minmax(150px,1fr)); overflow-x: auto; padding-top: 12px; }
      .service-row.reverse .service-content, .service-row.reverse .service-visual { order: initial; }
      .compare-layout { grid-template-columns: 1fr; }
      .score-panel { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
      .score-panel strong { margin: 0; }
      .article-list { grid-template-columns: 1fr; }
    }
    @media (max-width: 560px) {
      .container { width: min(var(--container), calc(100% - 30px)); }
      .brand img { width: 128px; }
      h1 { font-size: 38px; }
      .hero-copy { font-size: 15px; }
      .hero-actions .button { width: 100%; }
      .section-head { display: block; }
      h2 { font-size: 25px; }
      .metric-strip { grid-template-columns: repeat(2,minmax(0,1fr)); }
      .metric:nth-child(2) { border-right: 0; }
      .metric:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
      .feature-grid, .solution-grid, .review-grid { grid-template-columns: 1fr; }
      .check-list { grid-template-columns: 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .field.full { grid-column: auto; }
      .join-band, .footer-top, .footer-bottom { flex-direction: column; align-items: flex-start; }
      .footer-links { justify-content: flex-start; }
      .floating-contact { right: 10px; bottom: 12px; }
      .floating-contact a { width: 44px; height: 44px; }
    }