:root {
      color-scheme: light;
      --ink: #14223b;
      --muted: #5c6b82;
      --blue: #1258d6;
      --blue-dark: #073b9c;
      --sky: #eaf2ff;
      --line: #dce4f0;
      --paper: #ffffff;
      --wash: #f4f7fc;
      --green: #18866a;
      --container: 1160px;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 88px; }
    body {
      margin: 0;
      background: var(--wash);
      color: var(--ink);
      font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
      line-height: 1.65;
    }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font: inherit; }
    button, a { -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); }
    .nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
    .brand { display: inline-flex; align-items: center; gap: 11px; min-width: max-content; font-weight: 800; font-size: 18px; }
    .brand img { display: block; width: 40px; height: 40px; object-fit: contain; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; flex-wrap: wrap; }
    .nav-links a { padding: 9px 11px; color: #43516a; font-size: 13px; transition: color .2s ease; }
    .nav-links a:hover { color: var(--blue); }
    .nav-actions { display: flex; align-items: center; gap: 10px; }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); background: white; color: var(--ink); cursor: pointer; border-radius: 6px; }
    .button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 19px; border: 1px solid transparent; border-radius: 5px; background: var(--blue); color: white; font-weight: 700; cursor: pointer; transition: transform .18s ease, background .18s ease, box-shadow .18s ease; }
    .button:hover { transform: translateY(-2px); background: var(--blue-dark); box-shadow: 0 8px 20px rgba(18,88,214,.18); }
    .button-outline { color: var(--blue-dark); background: white; border-color: #b8c9e4; }
    .button-outline:hover { color: white; }
    .eyebrow { color: var(--blue); text-transform: uppercase; letter-spacing: 1.2px; font-size: 12px; font-weight: 800; }
    h1, h2, h3, p { margin-top: 0; }
    h1 { font-size: clamp(38px, 5.3vw, 66px); line-height: 1.12; letter-spacing: 0; margin: 16px 0 20px; max-width: 760px; }
    h2 { font-size: clamp(28px, 3.5vw, 40px); line-height: 1.2; letter-spacing: 0; margin-bottom: 14px; }
    h3 { font-size: 18px; line-height: 1.35; letter-spacing: 0; margin-bottom: 9px; }
    .lead { max-width: 690px; color: #d7e5ff; font-size: 17px; }
    .hero { position: relative; overflow: hidden; color: white; background: linear-gradient(118deg, #092f7e 0%, #1258d6 56%, #1977de 100%); }
    .hero::before, .hero::after { content: ""; position: absolute; pointer-events: none; border: 1px solid rgba(255,255,255,.17); transform: rotate(-24deg); }
    .hero::before { width: 520px; height: 180px; right: -110px; top: 80px; }
    .hero::after { width: 420px; height: 130px; right: -70px; top: 145px; border-color: rgba(255,255,255,.1); }
    .hero-inner { position: relative; z-index: 1; padding-block: 76px 48px; }
    .hero .eyebrow { color: #a9d7ff; }
    .hero h1 span { color: #bce2ff; }
    .hero-actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 27px; }
    .hero .button { background: white; color: #0b3e9b; }
    .hero .button:hover { background: #e8f3ff; }
    .hero .button-outline { color: white; border-color: rgba(255,255,255,.48); background: transparent; }
    .hero .button-outline:hover { background: rgba(255,255,255,.13); }
    .hero-note { margin: 18px 0 0; font-size: 13px; color: #d7e5ff; }
    .hero-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin-top: 54px; background: rgba(255,255,255,.25); border: 1px solid rgba(255,255,255,.25); }
    .hero-stat { padding: 18px 20px; background: rgba(5,43,119,.35); }
    .hero-stat strong { display: block; font-size: 20px; color: white; }
    .hero-stat span { font-size: 13px; color: #d7e5ff; }
    .section { padding-block: 76px; }
    .section-white { background: var(--paper); }
    .section-heading { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 30px; }
    .section-heading p { max-width: 590px; margin-bottom: 3px; color: var(--muted); }
    .intro-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 46px; align-items: center; }
    .intro-copy p { color: var(--muted); }
    .intro-image { overflow: hidden; border: 1px solid var(--line); background: #eaf1fc; }
    .intro-image img { display: block; width: 100%; }
    .capability-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
    .capability { min-height: 166px; padding: 22px; background: white; border: 1px solid var(--line); transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease; }
    .capability:hover, .service:hover { transform: translateY(-4px); border-color: #9bb9ed; box-shadow: 0 12px 28px rgba(21,53,104,.08); }
    .capability .index { color: var(--blue); font-size: 12px; font-weight: 800; }
    .capability p, .service p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 24px; }
    .tag-cloud span { padding: 7px 11px; background: #eaf2ff; border-left: 2px solid var(--blue); color: #24436f; font-size: 13px; }
    .service-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
    .service { padding: 20px; min-height: 162px; background: white; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease; }
    .service small { display: block; margin-bottom: 11px; color: var(--blue); font-size: 12px; font-weight: 800; }
    .split-band { background: #edf4ff; border-block: 1px solid #d9e7fb; }
    .split-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 44px; align-items: start; }
    .split-layout > div:first-child p { color: var(--muted); }
    .workflow { counter-reset: step; display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid #a9c2e8; }
    .workflow article { position: relative; padding: 22px 18px 0 0; }
    .workflow article::before { counter-increment: step; content: "0" counter(step); display: block; margin-bottom: 12px; color: var(--blue); font-size: 24px; font-weight: 800; }
    .workflow p { margin-bottom: 0; color: var(--muted); font-size: 14px; }
    .comparison { width: 100%; border-collapse: collapse; background: white; font-size: 14px; }
    .comparison th, .comparison td { padding: 14px 16px; border: 1px solid var(--line); text-align: left; vertical-align: top; }
    .comparison th { background: #eaf2ff; color: #183b77; }
    .comparison td:first-child { font-weight: 700; }
    .rating-band { display: flex; align-items: center; justify-content: space-between; gap: 22px; margin-bottom: 18px; padding: 20px 24px; background: #0c408f; color: white; }
    .rating-band strong { display: block; font-size: 25px; }
    .rating-band span { color: #d7e5ff; font-size: 13px; }
    .stars { color: #ffd56a; letter-spacing: 0; font-size: 22px; }
    .table-scroll { overflow-x: auto; }
    .case-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 20px; align-items: start; }
    .case-feature { background: white; border: 1px solid var(--line); }
    .case-feature img { display: block; width: 100%; }
    .case-caption { padding: 18px 20px; }
    .case-caption p { margin: 0; color: var(--muted); font-size: 14px; }
    .case-side { display: grid; gap: 14px; }
    .case-side img { display: block; width: 100%; }
    .case-side article { background: white; border: 1px solid var(--line); }
    .case-side .case-caption { padding: 15px 17px; }
    .reviews { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
    .review { padding: 21px; border-top: 3px solid var(--blue); background: white; border-bottom: 1px solid var(--line); }
    .review p { color: #43516a; font-size: 14px; }
    .review strong { font-size: 13px; }
    .review span { color: var(--muted); font-size: 12px; }
    .network-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: center; }
    .network-copy p { color: var(--muted); }
    .model-list { display: flex; flex-wrap: wrap; gap: 8px; }
    .model-list span { padding: 8px 10px; background: white; border: 1px solid var(--line); font-size: 13px; color: #31435f; }
    .contact-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 42px; align-items: start; }
    .contact-info { padding-top: 8px; }
    .contact-info p { color: var(--muted); }
    .contact-lines { display: grid; gap: 10px; margin-top: 22px; }
    .contact-lines a, .contact-lines span { color: #274b85; }
    .form { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; padding: 24px; background: white; border: 1px solid var(--line); }
    .form label { display: grid; gap: 6px; color: #35445c; font-size: 13px; font-weight: 700; }
    .form .full { grid-column: 1 / -1; }
    .form input, .form select, .form textarea { width: 100%; padding: 11px 12px; color: var(--ink); background: #fbfcfe; border: 1px solid #ccd6e5; border-radius: 3px; outline: none; }
    .form input:focus, .form select:focus, .form textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(18,88,214,.1); }
    .form textarea { min-height: 112px; resize: vertical; }
    .form-note { color: var(--muted); font-size: 12px; margin: 0; }
    .faq-list { border-top: 1px solid var(--line); }
    .faq-item { border-bottom: 1px solid var(--line); background: white; }
    .faq-item summary { display: flex; justify-content: space-between; gap: 18px; align-items: center; padding: 18px 2px; cursor: pointer; font-weight: 700; list-style: none; }
    .faq-item summary::-webkit-details-marker { display: none; }
    .faq-item summary::after { content: "+"; color: var(--blue); font-size: 22px; line-height: 1; }
    .faq-item[open] summary::after { content: "−"; }
    .faq-item p { margin: -3px 34px 18px 2px; color: var(--muted); font-size: 14px; }
    .articles { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
    .article-link { min-height: 104px; padding: 17px; display: flex; align-items: end; background: white; border: 1px solid var(--line); color: #24436f; font-weight: 700; font-size: 14px; transition: border-color .2s ease, transform .2s ease; }
    .article-link:hover { transform: translateY(-3px); border-color: var(--blue); }
    .links-list { display: flex; flex-wrap: wrap; gap: 10px 20px; }
    .links-list a { color: #24436f; font-size: 14px; text-decoration: underline; text-decoration-color: #b7c9e3; text-underline-offset: 4px; }
    .footer { padding: 28px 0; color: #dce7f8; background: #102448; }
    .footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 18px; }
    .footer p { margin: 0; font-size: 13px; }
    .footer a { color: #dce7f8; }
    .floating { position: fixed; z-index: 15; right: 18px; bottom: 20px; display: grid; gap: 9px; }
    .floating a { display: grid; place-items: center; width: 48px; height: 48px; border: 1px solid #c8d7ee; background: white; color: var(--blue-dark); box-shadow: 0 5px 18px rgba(20,34,59,.12); border-radius: 50%; font-size: 12px; font-weight: 800; }
    .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) {
      html { scroll-behavior: auto; }
      *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
      .reveal { opacity: 1; transform: none; }
    }
    @media (max-width: 980px) {
      .menu-toggle { display: inline-grid; place-items: center; }
      .nav { position: relative; }
      .nav-links { display: none; position: absolute; top: 72px; left: 0; right: 0; padding: 10px 12px 14px; background: white; border: 1px solid var(--line); box-shadow: 0 12px 22px rgba(20,34,59,.1); align-items: stretch; }
      .nav-links.open { display: grid; grid-template-columns: repeat(2, 1fr); }
      .nav-links a { padding: 11px; }
      .nav-actions .button { display: none; }
      .service-grid { grid-template-columns: repeat(3, 1fr); }
      .articles { grid-template-columns: repeat(3, 1fr); }
    }
    @media (max-width: 680px) {
      .container { width: min(var(--container), calc(100% - 30px)); }
      .nav { min-height: 64px; }
      .brand img { width: 34px; height: 34px; }
      .nav-links { top: 64px; }
      .hero-inner { padding-block: 58px 32px; }
      .hero::before { right: -300px; }
      .hero::after { right: -280px; }
      .hero-stats { grid-template-columns: repeat(2, 1fr); margin-top: 36px; }
      .hero-stat { padding: 14px; }
      .section { padding-block: 54px; }
      .section-heading { display: block; }
      .section-heading p { margin-top: 10px; }
      .intro-grid, .split-layout, .case-grid, .network-grid, .contact-grid { grid-template-columns: 1fr; gap: 24px; }
      .capability-grid { grid-template-columns: 1fr 1fr; }
      .service-grid { grid-template-columns: 1fr 1fr; }
      .service { min-height: 0; padding: 16px; }
      .workflow { grid-template-columns: 1fr 1fr; row-gap: 20px; }
      .reviews { grid-template-columns: 1fr; }
      .rating-band { align-items: flex-start; flex-direction: column; }
      .articles { grid-template-columns: 1fr 1fr; }
      .form { grid-template-columns: 1fr; padding: 18px; }
      .form .full { grid-column: auto; }
      .footer-inner { align-items: flex-start; flex-direction: column; }
      .comparison { min-width: 760px; }
      .floating { right: 12px; bottom: 12px; }
    }
    @media (max-width: 390px) {
      .brand { font-size: 16px; }
      .capability-grid, .service-grid, .articles { grid-template-columns: 1fr; }
      .hero-actions .button { width: 100%; }
    }