:root {
      color-scheme: light;
      --ink: #202535;
      --muted: #626b7c;
      --line: #e2e6ed;
      --paper: #f7f8fb;
      --white: #fff;
      --violet: #6655cf;
      --violet-dark: #4538a6;
      --teal: #178b86;
      --lime: #b7cf4a;
      --rose: #d85b81;
      --shadow: 0 12px 34px rgba(37, 45, 75, .08);
      --width: 1160px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 82px; }
    body {
      margin: 0;
      background:
        linear-gradient(135deg, rgba(102,85,207,.035), transparent 28rem),
        linear-gradient(315deg, rgba(23,139,134,.035), transparent 32rem),
        var(--paper);
      color: var(--ink);
      font: 16px/1.65 "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font: inherit; }
    button, a { -webkit-tap-highlight-color: transparent; }
    img { display: block; max-width: 100%; height: auto; }
    .container { width: min(var(--width), calc(100% - 40px)); margin-inline: auto; }
    .site-header {
      position: sticky; top: 0; z-index: 20;
      background: rgba(255,255,255,.94);
      border-bottom: 1px solid rgba(226,230,237,.9);
      backdrop-filter: blur(14px);
    }
    .nav-row { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 22px; }
    .brand { display: inline-flex; align-items: center; gap: 11px; flex: 0 0 auto; font-weight: 750; }
    .brand img { width: 38px; max-height: 42px; object-fit: contain; }
    .brand-name { font-size: 17px; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; flex-wrap: wrap; }
    .nav-links a { padding: 9px 10px; color: #50586a; font-size: 13px; transition: color .2s ease; }
    .nav-links a:hover, .nav-links a:focus-visible { color: var(--violet-dark); }
    .nav-cta, .button {
      display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      border: 0; border-radius: 5px; padding: 11px 17px;
      background: var(--violet); color: #fff; font-weight: 700; cursor: pointer;
      transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
    }
    .nav-cta { flex: 0 0 auto; font-size: 13px; padding: 10px 14px; }
    .button:hover, .nav-cta:hover { transform: translateY(-2px); background: var(--violet-dark); box-shadow: 0 8px 18px rgba(69,56,166,.2); }
    .button.outline { background: transparent; color: var(--ink); border: 1px solid #cbd0dc; }
    .button.outline:hover { color: var(--violet-dark); border-color: var(--violet); box-shadow: none; }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 5px; background: #fff; color: var(--ink); cursor: pointer; }
    .menu-toggle span { display: block; width: 18px; height: 2px; margin: 4px auto; background: currentColor; }
    .hero { position: relative; overflow: hidden; padding: 86px 0 50px; }
    .hero::before {
      content: ""; position: absolute; inset: 0 0 auto; height: 450px; z-index: -1;
      background: linear-gradient(112deg, rgba(102,85,207,.11), rgba(23,139,134,.08) 48%, rgba(216,91,129,.08));
      clip-path: polygon(0 0,100% 0,100% 76%,70% 100%,0 82%);
    }
    .hero-inner { max-width: 850px; }
    .eyebrow { display: inline-flex; align-items: center; gap: 8px; color: var(--violet-dark); font-size: 13px; font-weight: 750; letter-spacing: 0; }
    .eyebrow::before { content: ""; width: 22px; height: 2px; background: linear-gradient(90deg,var(--violet),var(--teal),var(--rose)); }
    h1 { max-width: 780px; margin: 18px 0 15px; font-size: clamp(38px, 5.5vw, 66px); line-height: 1.12; letter-spacing: 0; }
    .hero p { max-width: 690px; margin: 0; color: #515a6b; font-size: 18px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 27px; }
    .hero-note { margin-top: 15px !important; color: #6c7483 !important; font-size: 13px !important; }
    .hero-strip { display: grid; grid-template-columns: repeat(4,1fr); gap: 0; margin-top: 58px; border-block: 1px solid rgba(160,166,185,.36); }
    .metric { padding: 19px 20px 19px 0; }
    .metric + .metric { padding-left: 20px; border-left: 1px solid rgba(160,166,185,.36); }
    .metric strong { display: block; font-size: 21px; }
    .metric span { color: var(--muted); font-size: 13px; }
    main section { padding: 68px 0; }
    .section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 28px; }
    .section-head > div { max-width: 720px; }
    .section-kicker { margin: 0 0 6px; color: var(--teal); font-size: 12px; font-weight: 800; text-transform: uppercase; }
    h2 { margin: 0; font-size: clamp(27px, 3.4vw, 38px); line-height: 1.2; letter-spacing: 0; }
    .section-head p { max-width: 480px; margin: 0; color: var(--muted); }
    .intro-band { padding-top: 24px; }
    .intro-layout { display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; align-items: start; }
    .intro-copy p { color: #535d70; margin: 0 0 16px; }
    .intro-copy strong { color: var(--ink); }
    .feature-list { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 12px 22px; margin: 22px 0 0; padding: 0; list-style: none; }
    .feature-list li { padding: 11px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
    .feature-list li::before { content: "✓"; margin-right: 9px; color: var(--teal); font-weight: 800; }
    .model-panel { padding: 22px; border-left: 3px solid var(--violet); background: #fff; box-shadow: var(--shadow); }
    .model-panel h3 { margin: 0 0 9px; font-size: 17px; }
    .model-panel p { margin: 0; color: var(--muted); font-size: 14px; }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
    .tag { padding: 5px 9px; border: 1px solid #e1e4ec; border-radius: 3px; color: #4c5363; background: #fbfbfd; font-size: 12px; }
    .services-section { background: linear-gradient(180deg,rgba(255,255,255,.38),rgba(236,239,249,.68)); border-block: 1px solid rgba(226,230,237,.8); }
    .service-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 14px; }
    .service-item { padding: 19px; background: rgba(255,255,255,.9); border: 1px solid var(--line); transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease; }
    .service-item:hover { transform: translateY(-4px); border-color: #b8b1e8; box-shadow: var(--shadow); }
    .service-item h3 { margin: 0 0 7px; font-size: 17px; }
    .service-item p { margin: 0; color: var(--muted); font-size: 13px; }
    .service-index { display: block; margin-bottom: 12px; color: var(--violet); font-size: 12px; font-weight: 800; }
    .workflow { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 0; border-block: 1px solid var(--line); }
    .step { position: relative; padding: 22px 24px 22px 0; }
    .step + .step { padding-left: 22px; border-left: 1px solid var(--line); }
    .step span { color: var(--rose); font-size: 12px; font-weight: 800; }
    .step h3 { margin: 5px 0; font-size: 17px; }
    .step p { margin: 0; color: var(--muted); font-size: 13px; }
    .solutions { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 0 28px; border-top: 1px solid var(--line); }
    .solution { padding: 19px 0; border-bottom: 1px solid var(--line); }
    .solution h3 { margin: 0 0 5px; font-size: 16px; }
    .solution p { margin: 0; color: var(--muted); font-size: 13px; }
    .network-band { padding: 27px; background: #22283b; color: #fff; display: grid; grid-template-columns: .8fr 1.2fr; gap: 28px; align-items: center; }
    .network-band h2 { font-size: 27px; }
    .network-band p { margin: 10px 0 0; color: #d1d5e0; font-size: 14px; }
    .network-tags { display: flex; flex-wrap: wrap; gap: 9px; }
    .network-tags span { padding: 7px 10px; border: 1px solid #596075; color: #eef0f6; font-size: 12px; }
    .cases { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
    .case { background: #fff; border: 1px solid var(--line); overflow: hidden; }
    .case img { width: 100%; aspect-ratio: 16/8; object-fit: cover; background: #eceef3; }
    .case-copy { padding: 18px 20px; }
    .case-copy h3 { margin: 0 0 6px; font-size: 17px; }
    .case-copy p { margin: 0; color: var(--muted); font-size: 14px; }
    .review-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 13px; }
    .review { padding: 19px; border-top: 2px solid var(--teal); background: #fff; box-shadow: 0 5px 18px rgba(37,45,75,.045); }
    .review p { margin: 0 0 14px; color: #4f586a; font-size: 14px; }
    .review strong { font-size: 13px; }
    .review span { display: block; color: #858c99; font-size: 12px; }
    .compare-wrap { overflow-x: auto; border: 1px solid var(--line); background: #fff; }
    table { width: 100%; border-collapse: collapse; min-width: 680px; }
    th, td { padding: 14px 16px; text-align: left; border-bottom: 1px solid var(--line); font-size: 13px; }
    th { background: #f0effa; color: #302c57; font-weight: 750; }
    tbody tr:last-child td { border-bottom: 0; }
    td:first-child { font-weight: 700; }
    .scoreline { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin: 0 0 17px; }
    .score { color: var(--violet-dark); font-size: 26px; font-weight: 800; }
    .stars { color: #c58a18; letter-spacing: 0; }
    .scoreline small { color: var(--muted); }
    .price-note { padding: 17px 19px; margin-top: 16px; border-left: 3px solid var(--lime); background: #fff; color: var(--muted); font-size: 13px; }
    .article-list { display: grid; grid-template-columns: repeat(5,minmax(0,1fr)); gap: 12px; }
    .article-link { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 74px; padding: 14px; border: 1px solid var(--line); background: #fff; font-size: 14px; font-weight: 650; transition: border-color .2s, color .2s; }
    .article-link::after { content: "↗"; color: var(--teal); }
    .article-link:hover { color: var(--violet-dark); border-color: var(--violet); }
    .faq-list { border-top: 1px solid var(--line); }
    .faq-item { border-bottom: 1px solid var(--line); }
    .faq-item summary { position: relative; padding: 17px 42px 17px 0; cursor: pointer; font-weight: 700; list-style: none; }
    .faq-item summary::-webkit-details-marker { display: none; }
    .faq-item summary::after { content: "+"; position: absolute; right: 6px; top: 12px; color: var(--violet); font-size: 23px; font-weight: 400; transition: transform .2s; }
    .faq-item[open] summary::after { transform: rotate(45deg); }
    .faq-answer { max-width: 820px; padding: 0 30px 18px 0; color: var(--muted); font-size: 14px; }
    .contact-section { background: linear-gradient(110deg,rgba(102,85,207,.08),rgba(23,139,134,.07)); border-block: 1px solid var(--line); }
    .contact-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 38px; align-items: start; }
    .contact-info p { color: var(--muted); }
    .contact-lines { display: grid; gap: 8px; margin-top: 20px; font-size: 14px; }
    .contact-lines a { color: var(--violet-dark); }
    .qr-box { display: flex; align-items: center; gap: 15px; margin-top: 20px; }
    .qr-box img { width: 112px; border: 1px solid var(--line); background: #fff; }
    .qr-box span { max-width: 170px; color: var(--muted); font-size: 13px; }
    .contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; padding: 22px; background: #fff; border: 1px solid var(--line); }
    .field { display: grid; gap: 6px; }
    .field.full { grid-column: 1 / -1; }
    .field label { color: #41495a; font-size: 13px; font-weight: 700; }
    .field input, .field select, .field textarea { width: 100%; min-width: 0; padding: 11px 12px; border: 1px solid #d8dce5; border-radius: 3px; color: var(--ink); background: #fff; outline: none; }
    .field input:focus, .field select:focus, .field textarea:focus { border-color: var(--violet); box-shadow: 0 0 0 3px rgba(102,85,207,.1); }
    .field textarea { min-height: 112px; resize: vertical; }
    .contact-form .button { justify-self: start; }
    .partner-row { display: flex; flex-wrap: wrap; gap: 10px 20px; }
    .partner-row a { color: #555e70; font-size: 13px; }
    .partner-row a:hover { color: var(--violet-dark); }
    .site-footer { padding: 25px 0; background: #eceef3; color: #394152; border-top: 1px solid #dfe2e9; }
    .footer-main { display: flex; align-items: center; justify-content: space-between; gap: 22px; }
    .footer-main p { margin: 0; color: #626a78; font-size: 12px; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 16px; }
    .footer-links a { color: #394152; font-size: 12px; }
    .floating-tools { position: fixed; right: 18px; bottom: 20px; z-index: 15; display: grid; gap: 8px; }
    .floating-tools a, .to-top { display: grid; place-items: center; min-width: 44px; min-height: 44px; padding: 0 10px; border: 1px solid #d9dce5; border-radius: 4px; background: #fff; color: var(--ink); box-shadow: 0 5px 18px rgba(37,45,75,.12); font-size: 12px; cursor: pointer; }
    .to-top { display: none; }
    .to-top.visible { display: grid; }
    .reveal { opacity: 0; transform: translateY(14px); transition: opacity .55s ease, transform .55s ease; }
    .reveal.in-view { opacity: 1; transform: translateY(0); }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
      .reveal { opacity: 1; transform: none; }
    }
    @media (max-width: 920px) {
      .nav-links { gap: 0; }
      .nav-links a { padding-inline: 7px; font-size: 12px; }
      .nav-cta { display: none; }
      .service-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
      .article-list { grid-template-columns: repeat(3,minmax(0,1fr)); }
      .solutions { grid-template-columns: repeat(2,minmax(0,1fr)); }
    }
    @media (max-width: 700px) {
      .container { width: min(var(--width), calc(100% - 32px)); }
      .nav-row { min-height: 64px; }
      .brand img { width: 34px; }
      .menu-toggle { display: block; margin-left: auto; }
      .nav-links { display: none; position: absolute; top: 63px; left: 0; right: 0; padding: 10px 16px 16px; background: #fff; border-bottom: 1px solid var(--line); box-shadow: 0 12px 20px rgba(37,45,75,.08); }
      .nav-links.open { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); }
      .nav-links a { padding: 10px 8px; font-size: 14px; }
      .hero { padding: 62px 0 35px; }
      .hero::before { height: 420px; }
      .hero p { font-size: 16px; }
      .hero-strip { grid-template-columns: repeat(2,1fr); margin-top: 38px; }
      .metric { padding: 15px 10px 15px 0; }
      .metric:nth-child(3) { border-left: 0; padding-left: 0; border-top: 1px solid rgba(160,166,185,.36); }
      .metric:nth-child(4) { border-top: 1px solid rgba(160,166,185,.36); }
      main section { padding: 52px 0; }
      .section-head { display: block; }
      .section-head p { margin-top: 10px; }
      .intro-layout, .network-band, .contact-grid { grid-template-columns: 1fr; gap: 24px; }
      .workflow { grid-template-columns: repeat(2,minmax(0,1fr)); }
      .step { padding: 18px 12px 18px 0; }
      .step + .step { padding-left: 14px; }
      .step:nth-child(3) { border-left: 0; padding-left: 0; border-top: 1px solid var(--line); }
      .step:nth-child(4) { border-top: 1px solid var(--line); }
      .service-grid, .review-grid { grid-template-columns: 1fr 1fr; }
      .cases { grid-template-columns: 1fr; }
      .article-list { grid-template-columns: 1fr 1fr; }
      .footer-main { align-items: flex-start; flex-direction: column; }
    }
    @media (max-width: 460px) {
      .service-grid, .review-grid, .solutions, .feature-list { grid-template-columns: 1fr; }
      .contact-form { grid-template-columns: 1fr; padding: 16px; }
      .field.full { grid-column: auto; }
      .article-list { grid-template-columns: 1fr; }
      .hero-actions .button { width: 100%; }
      .floating-tools { right: 10px; bottom: 10px; }
    }