:root {
      --ink: #182538;
      --muted: #607086;
      --blue: #2166f3;
      --cyan: #18b9b1;
      --orange: #ff8b42;
      --yellow: #ffd45d;
      --line: #dbe6f2;
      --paper: #f7fbff;
      --white: #ffffff;
      --shadow: 0 18px 50px rgba(31, 77, 135, .12);
      --container: 1180px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: 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; }
    .container { width: min(var(--container), calc(100% - 40px)); margin: 0 auto; }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(255,255,255,.94);
      border-bottom: 1px solid rgba(219,230,242,.9);
      backdrop-filter: blur(14px);
    }
    .nav {
      min-height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }
    .brand { display: inline-flex; align-items: center; flex: 0 0 auto; }
    .brand img { width: 142px; }
    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 0;
      flex-wrap: wrap;
    }
    .nav-links a {
      padding: 8px 10px;
      color: #40536b;
      font-size: 13px;
      transition: color .2s ease, transform .2s ease;
    }
    .nav-links a:hover { color: var(--blue); transform: translateY(-1px); }
    .nav-cta, .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: 0;
      border-radius: 10px;
      padding: 12px 20px;
      font-weight: 700;
      cursor: pointer;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .button:hover, .nav-cta:hover { transform: translateY(-2px); box-shadow: 0 12px 24px rgba(33,102,243,.22); }
    .nav-cta, .button.primary { color: #fff; background: var(--blue); }
    .button.secondary { color: var(--blue); background: #eaf2ff; }
    .menu-toggle { display: none; border: 1px solid var(--line); background: #fff; border-radius: 8px; padding: 8px 10px; font-size: 20px; color: var(--ink); }
    .hero {
      position: relative;
      overflow: hidden;
      background:
        linear-gradient(135deg, #eaf5ff 0%, #ffffff 54%, #fff7e6 100%);
      padding: 76px 0 82px;
    }
    .hero:before, .hero:after {
      content: "";
      position: absolute;
      border-radius: 50%;
      pointer-events: none;
      opacity: .65;
    }
    .hero:before { width: 380px; height: 380px; right: -120px; top: -100px; background: #c9f4f0; filter: blur(2px); }
    .hero:after { width: 230px; height: 230px; left: -80px; bottom: -100px; background: #ffe3aa; }
    .hero-grid {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: 1.08fr .92fr;
      gap: 60px;
      align-items: center;
    }
    .eyebrow, .section-kicker {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: var(--blue);
      font-weight: 800;
      letter-spacing: 1px;
      font-size: 13px;
    }
    .eyebrow:before, .section-kicker:before {
      content: "";
      width: 24px;
      height: 3px;
      border-radius: 2px;
      background: var(--orange);
    }
    h1, h2, h3 { line-height: 1.2; margin: 0; letter-spacing: 0; }
    h1 { max-width: 680px; margin-top: 16px; font-size: clamp(38px, 6vw, 68px); }
    h1 span { color: var(--blue); }
    .hero-copy { max-width: 650px; margin: 22px 0 28px; color: var(--muted); font-size: 18px; }
    .hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
    .hero-proof {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
      padding: 20px;
      background: rgba(255,255,255,.72);
      border: 1px solid rgba(255,255,255,.95);
      border-radius: 20px;
      box-shadow: var(--shadow);
    }
    .proof-main { grid-column: 1 / -1; padding: 8px 4px 14px; border-bottom: 1px solid var(--line); }
    .proof-main strong { display: block; color: var(--blue); font-size: 42px; line-height: 1.1; }
    .proof-item { padding: 12px; background: #fff; border-radius: 12px; }
    .proof-item strong { display: block; font-size: 22px; color: var(--ink); }
    .proof-item small { color: var(--muted); }
    .section { padding: 86px 0; }
    .section.alt { background: #fff; }
    .section-head { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 34px; }
    .section-head h2 { margin-top: 10px; font-size: clamp(28px, 4vw, 42px); }
    .section-head p { max-width: 530px; color: var(--muted); margin: 0; }
    .intro-grid, .service-grid, .case-grid, .review-grid, .contact-grid { display: grid; gap: 20px; }
    .intro-grid { grid-template-columns: 1.1fr .9fr; align-items: stretch; }
    .intro-copy { padding: 32px; background: #fff; border-left: 5px solid var(--cyan); box-shadow: var(--shadow); border-radius: 0 16px 16px 0; }
    .intro-copy p { color: var(--muted); }
    .highlight-list { display: grid; gap: 12px; margin: 24px 0 0; padding: 0; list-style: none; }
    .highlight-list li { padding-left: 28px; position: relative; }
    .highlight-list li:before { content: "✓"; position: absolute; left: 0; color: var(--cyan); font-weight: 800; }
    .about-panel { padding: 30px; background: #18304b; color: #fff; border-radius: 16px; }
    .about-panel p { color: #d6e5f4; }
    .tag-cloud { display: flex; gap: 9px; flex-wrap: wrap; margin-top: 20px; }
    .tag { display: inline-flex; padding: 7px 12px; border-radius: 30px; background: #e8f4ff; color: #2864a5; font-size: 13px; }
    .about-panel .tag { background: rgba(255,255,255,.13); color: #fff; }
    .metric-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 26px; }
    .metric { padding: 22px; background: #fff; border-top: 3px solid var(--yellow); border-radius: 12px; box-shadow: 0 8px 24px rgba(31,77,135,.07); }
    .metric strong { display: block; color: var(--blue); font-size: 30px; }
    .metric span { color: var(--muted); font-size: 14px; }
    .service-grid { grid-template-columns: repeat(4, 1fr); }
    .service-card, .review-card, .case-card, .network-card, .faq-item, .article-card {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 12px;
      transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
    }
    .service-card:hover, .review-card:hover, .case-card:hover, .network-card:hover, .article-card:hover {
      transform: translateY(-5px);
      border-color: #a9c8f4;
      box-shadow: var(--shadow);
    }
    .service-card { padding: 22px; }
    .service-icon { width: 42px; height: 42px; display: grid; place-items: center; color: #fff; background: var(--blue); border-radius: 10px; font-weight: 800; margin-bottom: 18px; }
    .service-card h3 { font-size: 19px; margin-bottom: 9px; }
    .service-card p { color: var(--muted); margin: 0; font-size: 14px; }
    .workflow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; position: relative; }
    .workflow:before { content: ""; position: absolute; top: 28px; left: 9%; right: 9%; height: 2px; background: #c6dcf5; }
    .step { position: relative; z-index: 1; text-align: center; padding: 0 10px; }
    .step-num { width: 58px; height: 58px; margin: 0 auto 18px; display: grid; place-items: center; border-radius: 50%; background: var(--blue); color: #fff; font-weight: 800; border: 7px solid #eaf3ff; }
    .step h3 { font-size: 17px; margin-bottom: 6px; }
    .step p { color: var(--muted); font-size: 13px; margin: 0; }
    .media-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 20px; align-items: stretch; }
    .media-frame { overflow: hidden; border-radius: 14px; background: #eaf2fb; }
    .media-frame img { width: 100%; height: 100%; object-fit: cover; }
    .media-stack { display: grid; grid-template-rows: 1fr 1fr; gap: 20px; }
    .case-grid { grid-template-columns: repeat(3, 1fr); }
    .case-card { overflow: hidden; }
    .case-card .media-frame { aspect-ratio: 16 / 9; border-radius: 0; }
    .case-body { padding: 20px; }
    .case-body h3 { font-size: 20px; margin-bottom: 8px; }
    .case-body p { color: var(--muted); margin: 0; font-size: 14px; }
    .solution-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .network-card { padding: 24px; }
    .network-card h3 { margin-bottom: 8px; font-size: 19px; }
    .network-card p { color: var(--muted); margin: 0; font-size: 14px; }
    .table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 14px; background: #fff; box-shadow: var(--shadow); }
    table { width: 100%; border-collapse: collapse; min-width: 760px; }
    th, td { padding: 17px 18px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
    th { background: #eaf3ff; color: #255a9f; font-size: 14px; }
    td { color: var(--muted); font-size: 14px; }
    td:first-child { color: var(--ink); font-weight: 700; }
    .recommended { color: var(--blue); font-weight: 800; }
    .score-box { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 26px; margin-bottom: 20px; background: #fff5db; border: 1px solid #f4d58e; border-radius: 14px; }
    .score-box strong { font-size: 46px; color: #e36d20; line-height: 1; }
    .stars { color: #ed931f; letter-spacing: 4px; font-size: 22px; }
    .price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .price-card { padding: 26px; background: #fff; border-radius: 14px; border: 1px solid var(--line); }
    .price-card.featured { border: 2px solid var(--blue); transform: translateY(-6px); }
    .price-card h3 { font-size: 20px; }
    .price-card .price { margin: 14px 0; font-size: 32px; color: var(--blue); font-weight: 800; }
    .price-card p, .price-card li { color: var(--muted); font-size: 14px; }
    .price-card ul { padding-left: 18px; margin-bottom: 22px; }
    .review-grid { grid-template-columns: repeat(3, 1fr); }
    .review-card { padding: 23px; }
    .review-card blockquote { margin: 0 0 18px; color: #40536b; }
    .review-user { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 13px; }
    .avatar { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 50%; background: #dff3ef; color: #168477; font-weight: 800; }
    .faq-list { display: grid; gap: 10px; max-width: 900px; margin: 0 auto; }
    .faq-item { overflow: hidden; }
    .faq-question { width: 100%; padding: 19px 22px; border: 0; background: #fff; color: var(--ink); display: flex; justify-content: space-between; align-items: center; text-align: left; font: inherit; font-weight: 700; cursor: pointer; }
    .faq-question span:last-child { color: var(--blue); font-size: 22px; }
    .faq-answer { display: none; padding: 0 22px 19px; color: var(--muted); font-size: 14px; }
    .faq-item.open .faq-answer { display: block; }
    .faq-item.open .faq-question { color: var(--blue); }
    .article-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 13px; }
    .article-card { padding: 17px; min-height: 130px; }
    .article-card small { color: var(--orange); font-weight: 700; }
    .article-card h3 { font-size: 16px; margin-top: 8px; }
    .contact-grid { grid-template-columns: .82fr 1.18fr; align-items: start; }
    .contact-info { padding: 30px; background: #18304b; border-radius: 16px; color: #fff; }
    .contact-info p { color: #d6e5f4; }
    .contact-list { display: grid; gap: 13px; margin: 24px 0; }
    .contact-list div { padding-bottom: 13px; border-bottom: 1px solid rgba(255,255,255,.16); }
    .contact-info img { width: 130px; margin-top: 18px; border-radius: 8px; }
    .form-box { padding: 30px; background: #fff; border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); }
    .form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .field { display: grid; gap: 7px; }
    .field.full { grid-column: 1 / -1; }
    label { font-weight: 700; font-size: 14px; }
    input, select, textarea { width: 100%; border: 1px solid #cbd9e8; border-radius: 8px; padding: 12px 13px; font: inherit; color: var(--ink); background: #fbfdff; outline: 0; }
    input:focus, select:focus, textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(33,102,243,.1); }
    textarea { min-height: 130px; resize: vertical; }
    .site-footer { background: #152a43; color: #d9e8f5; padding: 46px 0 22px; }
    .footer-grid { display: grid; grid-template-columns: 1.1fr .9fr .9fr; gap: 30px; }
    .site-footer h3 { color: #fff; font-size: 17px; margin-bottom: 13px; }
    .site-footer p { color: #b5c9dc; font-size: 14px; margin: 0; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 16px; }
    .footer-links a { color: #d9e8f5; font-size: 14px; }
    .footer-links a:hover { color: #ffd45d; }
    .copyright { margin-top: 32px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.14); color: #9fb5ca; font-size: 13px; }
    .float-tools { position: fixed; z-index: 15; right: 18px; bottom: 22px; display: grid; gap: 8px; }
    .float-tools a { width: 46px; height: 46px; display: grid; place-items: center; border-radius: 50%; background: var(--blue); color: #fff; box-shadow: 0 8px 20px rgba(33,102,243,.28); font-size: 13px; font-weight: 700; }
    .reveal { opacity: 0; transform: translateY(18px); transition: opacity .65s ease, transform .65s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }
    @media (max-width: 1000px) {
      .nav-links { display: none; position: absolute; left: 20px; right: 20px; top: 70px; padding: 12px; background: #fff; border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow); }
      .nav-links.active { display: grid; grid-template-columns: repeat(3, 1fr); }
      .nav-links a { padding: 10px; }
      .menu-toggle { display: block; }
      .hero-grid, .intro-grid, .media-grid, .contact-grid { grid-template-columns: 1fr; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .article-grid { grid-template-columns: repeat(3, 1fr); }
    }
    @media (max-width: 700px) {
      .container { width: min(var(--container), calc(100% - 28px)); }
      .nav { min-height: 66px; }
      .brand img { width: 120px; }
      .nav-cta { display: none; }
      .nav-links.active { grid-template-columns: repeat(2, 1fr); }
      .hero { padding: 54px 0 62px; }
      h1 { font-size: 40px; }
      .hero-copy { font-size: 16px; }
      .hero-proof { grid-template-columns: 1fr 1fr; }
      .metric-strip, .service-grid, .case-grid, .solution-grid, .price-grid, .review-grid { grid-template-columns: 1fr; }
      .workflow { grid-template-columns: 1fr; gap: 22px; }
      .workflow:before { top: 25px; bottom: 25px; left: calc(50% - 1px); width: 2px; height: auto; }
      .step { display: grid; grid-template-columns: 58px 1fr; gap: 14px; text-align: left; align-items: center; }
      .step-num { margin: 0; grid-row: span 2; }
      .step h3, .step p { grid-column: 2; }
      .step h3 { margin-top: -4px; }
      .media-stack { grid-template-rows: auto auto; }
      .article-grid { grid-template-columns: repeat(2, 1fr); }
      .section { padding: 62px 0; }
      .section-head { display: block; }
      .section-head p { margin-top: 14px; }
      .form-grid { grid-template-columns: 1fr; }
      .field.full { grid-column: auto; }
      .footer-grid { grid-template-columns: 1fr; gap: 24px; }
      .score-box { align-items: flex-start; flex-direction: column; }
    }