:root {
      --ink: #172238;
      --muted: #607089;
      --paper: #f7faff;
      --white: #ffffff;
      --line: #dce6f3;
      --blue: #2366f2;
      --cyan: #13b9cc;
      --violet: #7656ef;
      --pink: #ef4fa3;
      --yellow: #ffca55;
      --navy: #111a35;
      --shadow: 0 18px 50px rgba(30, 65, 125, .12);
      --container: min(1160px, calc(100% - 40px));
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background:
        radial-gradient(circle at 8% 12%, rgba(35, 102, 242, .08), transparent 27rem),
        radial-gradient(circle at 92% 40%, rgba(239, 79, 163, .06), transparent 25rem),
        var(--paper);
      font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
      line-height: 1.7;
    }
    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; height: auto; display: block; }
    button, input, select, textarea { font: inherit; }
    .container { width: var(--container); margin: 0 auto; }
    .topbar {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(255,255,255,.92);
      border-bottom: 1px solid rgba(220,230,243,.88);
      backdrop-filter: blur(16px);
    }
    .nav {
      min-height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
    }
    .brand {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
      font-weight: 800;
      color: var(--navy);
      letter-spacing: 0;
    }
    .brand img { width: 132px; }
    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 0;
      flex-wrap: wrap;
    }
    .nav-links a {
      color: #45546d;
      font-size: 14px;
      padding: 8px 10px;
      transition: color .25s ease;
    }
    .nav-links a:hover { color: var(--blue); }
    .nav-cta, .primary-btn, .outline-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border-radius: 8px;
      padding: 11px 18px;
      font-weight: 700;
      cursor: pointer;
      border: 1px solid transparent;
      transition: transform .25s ease, box-shadow .25s ease, background .25s ease;
    }
    .nav-cta, .primary-btn {
      color: #fff;
      background: linear-gradient(100deg, var(--blue), var(--violet));
      box-shadow: 0 10px 24px rgba(35,102,242,.22);
    }
    .nav-cta:hover, .primary-btn:hover { transform: translateY(-2px); box-shadow: 0 14px 28px rgba(35,102,242,.28); }
    .outline-btn {
      color: var(--blue);
      background: #fff;
      border-color: #b9cdf1;
    }
    .outline-btn:hover { background: #eef5ff; transform: translateY(-2px); }
    .menu-toggle {
      display: none;
      border: 1px solid var(--line);
      background: #fff;
      color: var(--ink);
      border-radius: 7px;
      padding: 7px 10px;
      cursor: pointer;
    }

    .hero {
      position: relative;
      overflow: hidden;
      min-height: 690px;
      display: flex;
      align-items: center;
      background:
        linear-gradient(120deg, rgba(255,255,255,.98), rgba(239,247,255,.96) 48%, rgba(247,240,255,.94)),
        var(--paper);
      border-bottom: 1px solid var(--line);
    }
    .hero::before, .hero::after {
      content: "";
      position: absolute;
      pointer-events: none;
      border: 1px solid rgba(35,102,242,.18);
      transform: rotate(22deg);
    }
    .hero::before { width: 420px; height: 420px; right: -150px; top: -150px; border-radius: 42%; }
    .hero::after { width: 280px; height: 280px; left: -110px; bottom: -150px; border-radius: 50%; border-color: rgba(239,79,163,.2); }
    .hero-grid {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: 1.12fr .88fr;
      align-items: center;
      gap: 62px;
      padding: 90px 0 74px;
    }
    .eyebrow, .section-kicker {
      color: var(--blue);
      font-weight: 800;
      letter-spacing: 2px;
      font-size: 13px;
      text-transform: uppercase;
    }
    h1, h2, h3, p { margin-top: 0; }
    h1 {
      max-width: 700px;
      margin-bottom: 22px;
      font-size: clamp(38px, 5.4vw, 72px);
      line-height: 1.12;
      letter-spacing: 0;
      color: var(--navy);
    }
    .hero-copy {
      max-width: 650px;
      color: #52627a;
      font-size: 18px;
      margin-bottom: 30px;
    }
    .hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
    .hero-note {
      margin-top: 22px;
      color: #6d7b90;
      font-size: 13px;
    }
    .signal-panel {
      position: relative;
      padding: 28px;
      background: rgba(255,255,255,.82);
      border: 1px solid rgba(164,187,225,.7);
      box-shadow: var(--shadow);
      border-radius: 16px;
      animation: rise .8s ease both;
    }
    .signal-panel::after {
      content: "";
      position: absolute;
      width: 10px;
      height: 10px;
      right: 28px;
      top: 28px;
      border-radius: 50%;
      background: var(--pink);
      box-shadow: 0 0 0 7px rgba(239,79,163,.12);
    }
    .signal-title { font-size: 22px; font-weight: 800; margin-bottom: 8px; color: var(--navy); }
    .signal-sub { color: var(--muted); font-size: 14px; margin-bottom: 22px; }
    .signal-line {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 14px 0;
      border-top: 1px solid var(--line);
      color: #41516b;
      font-size: 14px;
    }
    .signal-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 0 5px rgba(19,185,204,.12); }
    .metric-strip {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 12px;
      margin-top: 34px;
    }
    .metric {
      padding: 15px;
      border: 1px solid var(--line);
      border-radius: 10px;
      background: rgba(255,255,255,.72);
    }
    .metric strong { display: block; color: var(--navy); font-size: 24px; line-height: 1.1; }
    .metric span { color: var(--muted); font-size: 12px; }

    section { padding: 94px 0; }
    .section-head {
      max-width: 720px;
      margin-bottom: 38px;
    }
    h2 { font-size: clamp(28px, 4vw, 44px); line-height: 1.18; color: var(--navy); margin-bottom: 14px; }
    h3 { color: var(--navy); line-height: 1.3; margin-bottom: 10px; }
    .section-head p { color: var(--muted); margin-bottom: 0; }
    .about-layout {
      display: grid;
      grid-template-columns: .92fr 1.08fr;
      gap: 50px;
      align-items: start;
    }
    .about-lead {
      font-size: 23px;
      line-height: 1.5;
      color: var(--navy);
      font-weight: 700;
    }
    .about-copy { color: var(--muted); }
    .feature-grid, .service-grid, .solution-grid, .review-grid, .article-grid {
      display: grid;
      gap: 16px;
    }
    .feature-grid { grid-template-columns: repeat(3, 1fr); }
    .feature-item, .service-item, .solution-item, .review-card, .article-card {
      background: #fff;
      border: 1px solid var(--line);
      box-shadow: 0 10px 30px rgba(40,72,126,.06);
      border-radius: 10px;
      transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
    }
    .feature-item:hover, .service-item:hover, .solution-item:hover, .review-card:hover, .article-card:hover {
      transform: translateY(-5px);
      border-color: #a9c4f5;
      box-shadow: var(--shadow);
    }
    .feature-item { padding: 24px; }
    .feature-icon {
      width: 40px;
      height: 40px;
      display: grid;
      place-items: center;
      color: #fff;
      border-radius: 9px;
      margin-bottom: 17px;
      background: linear-gradient(135deg, var(--blue), var(--cyan));
      font-weight: 800;
    }
    .feature-item p, .service-item p, .solution-item p, .review-card p, .article-card p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .service-grid { grid-template-columns: repeat(4, 1fr); }
    .service-item { padding: 22px; min-height: 188px; }
    .service-item h3 { font-size: 18px; }
    .tag-list, .model-list {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .tag, .model {
      display: inline-flex;
      padding: 5px 10px;
      border-radius: 5px;
      background: #edf4ff;
      color: #2c5cae;
      font-size: 12px;
      border: 1px solid #d5e5ff;
    }
    .model { background: #fff3fa; color: #a23b72; border-color: #f4d4e7; }
    .workflow {
      background: var(--navy);
      color: #fff;
    }
    .workflow h2, .workflow h3 { color: #fff; }
    .workflow .section-kicker { color: #67dbe6; }
    .workflow .section-head p { color: #b8c5dc; }
    .steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 0;
      border-top: 1px solid rgba(255,255,255,.22);
    }
    .step { position: relative; padding: 30px 24px 0 0; }
    .step:not(:last-child)::after {
      content: "";
      position: absolute;
      top: -1px;
      right: 22px;
      width: 46px;
      height: 1px;
      background: var(--cyan);
    }
    .step-num {
      width: 34px;
      height: 34px;
      display: grid;
      place-items: center;
      border-radius: 50%;
      background: var(--cyan);
      color: var(--navy);
      font-weight: 800;
      margin-bottom: 18px;
    }
    .step p { color: #b8c5dc; font-size: 14px; }
    .solution-grid { grid-template-columns: repeat(3, 1fr); }
    .solution-item { padding: 21px; }
    .solution-item h3 { font-size: 17px; }
    .network {
      background: linear-gradient(135deg, #eef6ff, #fff5fb);
      border-top: 1px solid var(--line);
      border-bottom: 1px solid var(--line);
    }
    .network-layout {
      display: grid;
      grid-template-columns: .8fr 1.2fr;
      gap: 42px;
      align-items: center;
    }
    .network-board {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 9px;
    }
    .network-board span {
      padding: 15px 8px;
      text-align: center;
      background: #fff;
      border: 1px solid #d8e4f2;
      border-radius: 8px;
      font-size: 13px;
      font-weight: 700;
      color: #3c5170;
    }
    .compare-wrap {
      overflow-x: auto;
      border: 1px solid var(--line);
      background: #fff;
      border-radius: 10px;
      box-shadow: var(--shadow);
    }
    table { width: 100%; min-width: 760px; border-collapse: collapse; }
    th, td { padding: 17px 18px; text-align: left; border-bottom: 1px solid var(--line); font-size: 14px; }
    th { background: #eff5ff; color: var(--navy); }
    td:first-child { font-weight: 700; color: var(--navy); }
    tr:last-child td { border-bottom: 0; }
    .score-card {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      margin-bottom: 22px;
      padding: 24px;
      background: var(--navy);
      color: #fff;
      border-radius: 10px;
    }
    .score-card strong { font-size: 42px; color: var(--yellow); line-height: 1; }
    .stars { color: var(--yellow); letter-spacing: 4px; }
    .case-grid {
      display: grid;
      grid-template-columns: 1.1fr .9fr .9fr;
      gap: 16px;
      align-items: stretch;
    }
    .case-card {
      overflow: hidden;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 10px;
    }
    .case-card .media { aspect-ratio: 16/9; overflow: hidden; background: #eef3fa; }
    .case-card .media img { width: 100%; height: 100%; object-fit: cover; }
    .case-card-body { padding: 20px; }
    .case-card-body p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .review-grid { grid-template-columns: repeat(3, 1fr); }
    .review-card { padding: 24px; }
    .review-meta { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
    .review-meta strong { color: var(--navy); }
    .review-meta span { color: var(--blue); font-size: 12px; }
    .review-card p { color: #4c5d75; }
    .price-band {
      display: grid;
      grid-template-columns: .8fr 1.2fr;
      gap: 34px;
      align-items: center;
      padding: 36px;
      background: #fff;
      border: 1px solid var(--line);
      border-left: 5px solid var(--pink);
      border-radius: 10px;
      box-shadow: var(--shadow);
    }
    .price-band h3 { font-size: 26px; }
    .price-band p { color: var(--muted); margin-bottom: 0; }
    .faq-list { max-width: 900px; }
    details {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 8px;
      margin-bottom: 10px;
      overflow: hidden;
    }
    summary {
      cursor: pointer;
      padding: 17px 20px;
      list-style: none;
      font-weight: 700;
      color: var(--navy);
      position: relative;
      padding-right: 48px;
    }
    summary::-webkit-details-marker { display: none; }
    summary::after {
      content: "+";
      position: absolute;
      right: 20px;
      top: 13px;
      color: var(--blue);
      font-size: 23px;
      font-weight: 400;
    }
    details[open] summary::after { content: "−"; }
    details p { padding: 0 20px 18px; color: var(--muted); margin: 0; font-size: 14px; }
    .article-grid { grid-template-columns: repeat(3, 1fr); }
    .article-card { padding: 21px; }
    .article-card .article-label { color: var(--pink); font-size: 12px; font-weight: 800; margin-bottom: 12px; }
    .article-card h3 { font-size: 18px; }
    .contact {
      background: linear-gradient(120deg, #eaf4ff, #fff1fa);
      border-top: 1px solid var(--line);
    }
    .contact-layout {
      display: grid;
      grid-template-columns: .78fr 1.22fr;
      gap: 48px;
      align-items: start;
    }
    .contact-info p { color: var(--muted); }
    .contact-list { margin: 26px 0 0; padding: 0; list-style: none; }
    .contact-list li { padding: 10px 0; border-bottom: 1px solid rgba(151,174,209,.34); color: #44546e; }
    .contact-list strong { color: var(--navy); display: inline-block; min-width: 86px; }
    .form-panel {
      padding: 28px;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 10px;
      box-shadow: var(--shadow);
    }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
    label { display: block; font-size: 13px; font-weight: 700; color: var(--navy); }
    input, select, textarea {
      width: 100%;
      margin-top: 7px;
      padding: 12px 13px;
      border: 1px solid #cbd8e9;
      border-radius: 7px;
      color: var(--ink);
      background: #fbfdff;
      outline: none;
    }
    input:focus, select:focus, textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(35,102,242,.1); }
    textarea { min-height: 122px; resize: vertical; }
    .full { grid-column: 1 / -1; }
    .form-foot { display: flex; align-items: center; gap: 15px; margin-top: 18px; flex-wrap: wrap; }
    .form-foot small { color: var(--muted); }
    footer {
      background: #111a35;
      color: #b7c4d9;
      padding: 52px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.15fr .85fr .85fr 1.15fr;
      gap: 30px;
      padding-bottom: 32px;
      border-bottom: 1px solid rgba(255,255,255,.14);
    }
    footer h3 { color: #fff; font-size: 16px; margin-bottom: 14px; }
    footer p, footer a { color: #b7c4d9; font-size: 13px; }
    footer a:hover { color: #fff; }
    .footer-links { display: grid; gap: 7px; }
    .qr { width: 106px; margin-top: 10px; border-radius: 6px; }
    .copyright { display: flex; justify-content: space-between; gap: 16px; padding-top: 20px; font-size: 12px; color: #8f9db5; }
    .float-contact, .back-top {
      position: fixed;
      z-index: 15;
      right: 22px;
      border: 0;
      cursor: pointer;
      box-shadow: 0 12px 30px rgba(17,26,53,.22);
    }
    .float-contact {
      bottom: 74px;
      width: 52px;
      height: 52px;
      border-radius: 50%;
      color: #fff;
      background: linear-gradient(140deg, var(--pink), var(--violet));
      font-size: 21px;
    }
    .back-top {
      bottom: 16px;
      width: 36px;
      height: 36px;
      border-radius: 7px;
      color: var(--navy);
      background: #fff;
      border: 1px solid var(--line);
    }
    .reveal { opacity: 0; transform: translateY(18px); transition: opacity .65s ease, transform .65s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }
    @keyframes rise { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: translateY(0); } }

    @media (max-width: 1020px) {
      .nav-links a { padding: 8px 6px; font-size: 13px; }
      .hero-grid, .about-layout, .network-layout, .contact-layout { grid-template-columns: 1fr; }
      .hero { min-height: auto; }
      .hero-grid { gap: 35px; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .case-grid { grid-template-columns: repeat(2, 1fr); }
      .case-card:first-child { grid-column: 1 / -1; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 720px) {
      :root { --container: min(100% - 28px, 580px); }
      .topbar { position: relative; }
      .nav { min-height: 68px; }
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        left: 14px;
        right: 14px;
        top: 68px;
        padding: 10px;
        background: #fff;
        border: 1px solid var(--line);
        border-radius: 8px;
        box-shadow: var(--shadow);
        align-items: stretch;
      }
      .nav-links.open { display: grid; }
      .nav-links a, .nav-links .nav-cta { padding: 11px 12px; }
      .nav-cta { margin-top: 5px; }
      section { padding: 68px 0; }
      .hero-grid { padding: 68px 0 58px; }
      h1 { font-size: 42px; }
      .hero-copy { font-size: 16px; }
      .metric-strip, .feature-grid, .service-grid, .solution-grid, .review-grid, .article-grid, .steps, .form-grid { grid-template-columns: 1fr; }
      .metric-strip { gap: 8px; }
      .metric { display: flex; align-items: baseline; justify-content: space-between; }
      .step { padding: 22px 0; border-top: 1px solid rgba(255,255,255,.15); }
      .step:not(:last-child)::after { display: none; }
      .network-board { grid-template-columns: repeat(2, 1fr); }
      .case-grid { grid-template-columns: 1fr; }
      .case-card:first-child { grid-column: auto; }
      .price-band { grid-template-columns: 1fr; padding: 25px; }
      .score-card { align-items: flex-start; flex-direction: column; }
      .form-panel { padding: 20px; }
      .footer-grid { grid-template-columns: 1fr 1fr; gap: 22px 16px; }
      .copyright { display: block; }
      .copyright span { display: block; margin-top: 8px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
    }