:root {
      color-scheme: light;
      --ink: #17243b;
      --muted: #607087;
      --line: #dce4ef;
      --paper: #f6f8fc;
      --white: #fff;
      --blue: #275ee8;
      --teal: #078b83;
      --coral: #db594e;
      --gold: #c58518;
      --violet: #7352d4;
      --container: 1160px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 86px; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      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, input, select, textarea { -webkit-tap-highlight-color: transparent; }
    img { max-width: 100%; }
    .container { width: min(var(--container), calc(100% - 40px)); margin-inline: auto; }
    .site-header {
      position: sticky;
      z-index: 30;
      top: 0;
      background: rgba(255,255,255,.94);
      border-bottom: 1px solid #e4e9f2;
      backdrop-filter: blur(14px);
    }
    .nav-shell { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
    .brand { display: inline-flex; align-items: center; gap: 11px; flex: 0 0 auto; }
    .ai-page-logo { display: block; max-width: 100%; height: auto; width: 42px; max-height: 42px; object-fit: contain; }
    .brand-name { font-weight: 800; font-size: 17px; letter-spacing: 0; }
    .nav-links { display: flex; align-items: center; gap: 0; }
    .nav-links a { padding: 10px 12px; color: #41516a; font-size: 13px; white-space: nowrap; transition: color .2s ease; }
    .nav-links a:hover, .nav-links a:focus-visible { color: var(--blue); }
    .nav-actions { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 6px; background: #fff; color: var(--ink); cursor: pointer; }
    .button {
      display: inline-flex; justify-content: center; align-items: center; gap: 8px;
      min-height: 44px; padding: 10px 17px; border: 1px solid transparent; border-radius: 5px;
      color: #fff; background: var(--blue); font-weight: 700; font-size: 14px;
      transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
    }
    .button:hover { transform: translateY(-2px); background: #174bd0; box-shadow: 0 8px 20px rgba(39,94,232,.18); }
    .button-outline { color: var(--ink); background: #fff; border-color: #cfd8e5; }
    .button-outline:hover { color: var(--blue); background: #f6f8ff; box-shadow: none; }
    .button-dark { background: var(--ink); }
    .button-dark:hover { background: #243957; }
    .hero {
      position: relative; overflow: hidden; color: var(--ink);
      background:
        linear-gradient(118deg, rgba(40,93,230,.10), transparent 36%),
        linear-gradient(300deg, rgba(8,146,133,.12), transparent 43%),
        #f9fbff;
      border-bottom: 1px solid #e0e8f2;
    }
    .hero::before {
      content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .52;
      background: repeating-linear-gradient(132deg, transparent 0 46px, rgba(72,112,177,.07) 47px 48px);
      mask-image: linear-gradient(90deg, transparent, #000 35%, #000);
    }
    .hero-inner { position: relative; z-index: 1; padding-top: 72px; padding-bottom: 50px; }
    .hero-copy { max-width: 780px; }
    .eyebrow { display: inline-flex; align-items: center; gap: 9px; color: #2453ba; font-size: 12px; font-weight: 800; letter-spacing: 1.2px; text-transform: uppercase; }
    .eyebrow::before { content: ""; width: 22px; height: 2px; background: linear-gradient(90deg,var(--blue),var(--teal)); }
    h1 { margin: 18px 0 16px; max-width: 760px; font-size: clamp(36px, 5vw, 60px); line-height: 1.12; letter-spacing: 0; }
    .hero-copy p { margin: 0; max-width: 660px; color: #4d5e76; font-size: 17px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 27px; }
    .hero-note { margin-top: 18px !important; font-size: 12px !important; color: #69788b !important; }
    .hero-metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; margin-top: 52px; border-top: 1px solid #d8e1ed; }
    .metric { padding: 20px 20px 6px 0; }
    .metric + .metric { padding-left: 22px; border-left: 1px solid #d8e1ed; }
    .metric strong { display: block; font-size: 18px; line-height: 1.3; }
    .metric span { display: block; margin-top: 5px; color: var(--muted); font-size: 12px; }
    .signal { display: inline-block; width: 7px; height: 7px; margin-right: 7px; border-radius: 50%; background: var(--teal); vertical-align: 1px; }
    .section { padding: 76px 0; }
    .section-white { background: #fff; }
    .section-tint { background: #eef3fa; }
    .section-head { max-width: 710px; margin-bottom: 32px; }
    .section-kicker { margin: 0 0 8px; color: var(--teal); font-size: 12px; font-weight: 800; letter-spacing: 1.1px; }
    h2 { margin: 0; font-size: 32px; line-height: 1.25; letter-spacing: 0; }
    .section-head > p:last-child { margin: 12px 0 0; color: var(--muted); }
    h3 { margin: 0; font-size: 18px; line-height: 1.4; }
    .intro-layout { display: grid; grid-template-columns: 1.2fr .8fr; gap: 46px; align-items: start; }
    .intro-copy p { margin: 0 0 14px; color: #53637a; }
    .intro-aside { border-left: 2px solid var(--teal); padding: 4px 0 4px 22px; }
    .intro-aside strong { display: block; font-size: 17px; margin-bottom: 8px; }
    .intro-aside p { margin: 0; color: var(--muted); font-size: 14px; }
    .chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
    .chip { border: 1px solid #d7e0ec; padding: 6px 10px; border-radius: 3px; color: #44546b; background: #fff; font-size: 12px; }
    .service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
    .service-item { padding: 22px; background: #fff; border: 1px solid var(--line); border-top: 3px solid var(--accent, var(--blue)); transition: transform .22s ease, box-shadow .22s ease; }
    .service-item:hover { transform: translateY(-4px); box-shadow: 0 12px 28px rgba(33,56,89,.09); }
    .service-item p { margin: 9px 0 0; color: var(--muted); font-size: 13px; }
    .service-item .service-label { display: block; margin-bottom: 10px; color: var(--accent, var(--blue)); font-size: 11px; font-weight: 800; letter-spacing: .7px; }
    .capability-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: #dbe4ee; border: 1px solid #dbe4ee; }
    .capability { min-height: 145px; padding: 22px; background: #fff; }
    .capability b { display: block; margin-bottom: 8px; font-size: 15px; }
    .capability p { margin: 0; color: var(--muted); font-size: 13px; }
    .workflow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; counter-reset: flow; }
    .flow-step { position: relative; padding-top: 42px; border-top: 1px solid #cbd6e3; counter-increment: flow; }
    .flow-step::before { content: "0" counter(flow); position: absolute; top: -15px; left: 0; padding: 0 10px 0 0; color: var(--blue); background: var(--paper); font-size: 19px; font-weight: 800; }
    .section-white .flow-step::before { background: #fff; }
    .flow-step p { margin: 8px 0 0; color: var(--muted); font-size: 13px; }
    .industry-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 25px 32px; }
    .industry { padding: 16px 0 0; border-top: 1px solid #cfd9e5; }
    .industry p { margin: 7px 0 0; color: var(--muted); font-size: 13px; }
    .network-band { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 40px; }
    .network-band p { margin: 12px 0 0; color: var(--muted); }
    .network-points { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 24px; }
    .network-points span { padding: 10px 0; border-bottom: 1px solid #d8e1ed; font-size: 14px; }
    .case-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
    .case { display: grid; grid-template-columns: minmax(0,1fr) 150px; gap: 18px; align-items: center; padding: 16px; background: #fff; border: 1px solid var(--line); }
    .media-frame { overflow: hidden; background: #eaf0f7; aspect-ratio: 4 / 3; }
    .media-frame img { display: block; width: 100%; height: 100%; object-fit: cover; }
    .case-copy p { margin: 7px 0 0; color: var(--muted); font-size: 13px; }
    .case-wide { grid-column: 1 / -1; grid-template-columns: 1fr 190px; }
    .case-wide .media-frame { aspect-ratio: 16 / 9; }
    .review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
    .review { padding: 20px; background: #fff; border: 1px solid var(--line); }
    .review blockquote { margin: 0; color: #46566d; font-size: 14px; }
    .review footer { margin-top: 15px; color: var(--muted); font-size: 12px; }
    .review footer strong { display: block; color: var(--ink); font-size: 13px; }
    .rating-layout { display: grid; grid-template-columns: .75fr 1.25fr; gap: 35px; align-items: start; }
    .rating-panel { padding: 24px; color: #fff; background: #1d3150; }
    .rating-panel .rating-label { margin: 0; color: #c9d7ed; font-size: 12px; }
    .rating-score { margin: 8px 0 0; font-size: 48px; font-weight: 800; line-height: 1.1; }
    .rating-score small { font-size: 18px; font-weight: 500; }
    .stars { color: #ffd15d; font-size: 19px; letter-spacing: 0; }
    .rating-panel p:last-child { margin-bottom: 0; color: #dce7f5; font-size: 13px; }
    .table-wrap { overflow-x: auto; border: 1px solid var(--line); background: #fff; }
    table { width: 100%; border-collapse: collapse; text-align: left; font-size: 13px; }
    th, td { padding: 12px 14px; border-bottom: 1px solid #e4e9f0; vertical-align: top; }
    th { color: #293a54; background: #f0f4f9; font-weight: 800; }
    td { color: #52627a; }
    tr:last-child td { border-bottom: 0; }
    td:first-child { color: var(--ink); font-weight: 700; }
    .good { color: #08796f; font-weight: 700; }
    .needs-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 40px; align-items: start; }
    .needs-copy p { color: var(--muted); }
    .needs-copy ul { padding-left: 20px; color: #475870; font-size: 14px; }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
    .field { display: flex; flex-direction: column; gap: 6px; }
    .field-wide { grid-column: 1 / -1; }
    .field label { color: #3e4e65; font-size: 13px; font-weight: 700; }
    .field input, .field select, .field textarea { width: 100%; min-height: 44px; padding: 10px 12px; border: 1px solid #cbd5e1; border-radius: 4px; color: var(--ink); background: #fff; outline: none; }
    .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(39,94,232,.1); }
    .form-note { margin: 12px 0 0; color: #6c7889; font-size: 12px; }
    .price-rows { border-top: 1px solid #d7e0eb; }
    .price-row { display: grid; grid-template-columns: 1.1fr 1fr 1.4fr; gap: 18px; padding: 15px 0; border-bottom: 1px solid #d7e0eb; align-items: baseline; }
    .price-row strong { font-size: 14px; }
    .price-row span { color: var(--muted); font-size: 13px; }
    .price-row em { color: #067970; font-size: 12px; font-style: normal; }
    .article-list { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
    .article-link { min-height: 105px; display: flex; flex-direction: column; justify-content: space-between; padding: 15px; background: #fff; border: 1px solid var(--line); transition: border-color .2s ease, transform .2s ease; }
    .article-link:hover { transform: translateY(-3px); border-color: var(--blue); }
    .article-link strong { font-size: 14px; }
    .article-link span { color: var(--muted); font-size: 11px; }
    .faq-list { border-top: 1px solid #d9e2ed; }
    .faq-item { border-bottom: 1px solid #d9e2ed; }
    .faq-item summary { position: relative; padding: 17px 36px 17px 0; list-style: none; cursor: pointer; font-size: 15px; font-weight: 700; }
    .faq-item summary::-webkit-details-marker { display: none; }
    .faq-item summary::after { content: "+"; position: absolute; right: 4px; top: 13px; color: var(--blue); font-size: 22px; font-weight: 400; }
    .faq-item[open] summary::after { content: "−"; }
    .faq-item p { margin: -3px 34px 17px 0; color: var(--muted); font-size: 14px; }
    .join-band { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 26px; color: #fff; background: linear-gradient(108deg,#184c9e,#087f79); }
    .join-band h2 { font-size: 24px; }
    .join-band p { margin: 7px 0 0; color: #e0edf7; font-size: 13px; }
    .join-band .button { color: #133150; background: #fff; }
    .site-footer { color: #26364d; background: #e9eef5; border-top: 1px solid #d6deea; }
    .footer-main { display: grid; grid-template-columns: 1.1fr 1.5fr .8fr; gap: 36px; padding-top: 38px; padding-bottom: 30px; }
    .footer-main p { margin: 8px 0; color: #526178; font-size: 13px; }
    .footer-heading { margin: 0 0 10px; font-size: 14px; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 7px 16px; }
    .footer-links a { color: #42536b; font-size: 12px; }
    .footer-links a:hover { color: var(--blue); }
    .wechat { width: 110px; padding: 5px; border: 1px solid #cbd5e1; background: #fff; }
    .wechat img { display: block; width: 100%; height: auto; }
    .footer-bottom { padding: 13px 0; border-top: 1px solid #d3dce8; color: #5f6d80; font-size: 11px; }
    .floating-contact { position: fixed; z-index: 25; right: 18px; bottom: 18px; display: flex; align-items: center; gap: 8px; padding: 11px 14px; border: 1px solid #d0dbe9; border-radius: 5px; color: #fff; background: #193b68; box-shadow: 0 8px 24px rgba(25,59,104,.2); font-size: 13px; font-weight: 700; }
    .floating-contact:hover { background: #24558e; }
    .reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
    .reveal.is-visible { opacity: 1; transform: translateY(0); }
    @media (max-width: 980px) {
      .nav-links a { padding-inline: 7px; font-size: 12px; }
      .nav-actions .button-outline { display: none; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .capability-list { grid-template-columns: repeat(2, 1fr); }
      .article-list { grid-template-columns: repeat(3, 1fr); }
      .footer-main { grid-template-columns: 1fr 1.4fr; }
      .footer-contact { grid-column: 1 / -1; }
    }
    @media (max-width: 720px) {
      .container { width: min(var(--container), calc(100% - 32px)); }
      .nav-shell { min-height: 64px; }
      .menu-toggle { display: inline-grid; place-items: center; }
      .nav-actions { margin-left: auto; }
      .nav-actions .button { min-height: 40px; padding: 8px 11px; font-size: 12px; }
      .nav-links { display: none; position: absolute; top: 64px; left: 0; right: 0; padding: 8px 16px 14px; border-bottom: 1px solid var(--line); background: #fff; box-shadow: 0 12px 20px rgba(24,40,65,.08); }
      .nav-links.is-open { display: grid; grid-template-columns: 1fr 1fr; }
      .nav-links a { padding: 10px; font-size: 13px; }
      .hero-inner { padding-top: 52px; padding-bottom: 35px; }
      h1 { font-size: 39px; }
      .hero-copy p { font-size: 15px; }
      .hero-metrics { grid-template-columns: 1fr 1fr; margin-top: 36px; }
      .metric { padding: 16px 10px 13px 0; }
      .metric + .metric { padding-left: 14px; }
      .metric:nth-child(3) { border-left: 0; padding-left: 0; border-top: 1px solid #d8e1ed; }
      .metric:nth-child(4) { border-top: 1px solid #d8e1ed; }
      .section { padding: 56px 0; }
      h2 { font-size: 27px; }
      .intro-layout, .network-band, .rating-layout, .needs-layout { grid-template-columns: 1fr; gap: 25px; }
      .service-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
      .service-item { padding: 16px; }
      .service-item h3 { font-size: 16px; }
      .capability-list { grid-template-columns: 1fr 1fr; }
      .capability { min-height: 0; padding: 16px; }
      .workflow { grid-template-columns: 1fr 1fr; row-gap: 28px; }
      .industry-grid { grid-template-columns: 1fr 1fr; gap: 18px; }
      .case-grid { grid-template-columns: 1fr; }
      .case, .case-wide { grid-column: auto; grid-template-columns: minmax(0,1fr) 118px; gap: 12px; padding: 12px; }
      .case-wide .media-frame { aspect-ratio: 4 / 3; }
      .review-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
      .review { padding: 15px; }
      .price-row { grid-template-columns: 1fr 1fr; gap: 4px 12px; }
      .price-row em { grid-column: 1 / -1; }
      .article-list { grid-template-columns: 1fr 1fr; }
      .join-band { align-items: flex-start; flex-direction: column; }
      .footer-main { grid-template-columns: 1fr 1fr; gap: 24px; }
      .footer-contact { grid-column: 1 / -1; }
    }
    @media (max-width: 430px) {
      .brand-name { font-size: 15px; }
      .ai-page-logo { width: 35px; max-height: 35px; }
      .hero-actions .button { flex: 1 1 100%; }
      .service-grid { grid-template-columns: 1fr; }
      .review-grid { grid-template-columns: 1fr; }
      .case, .case-wide { grid-template-columns: 1fr; }
      .case .media-frame { aspect-ratio: 16 / 9; }
      .case-copy { order: 1; }
      .case .media-frame { order: 0; }
      .footer-main { grid-template-columns: 1fr; }
      .footer-contact { grid-column: auto; }
      .floating-contact { right: 12px; bottom: 12px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
      .reveal { opacity: 1; transform: none; }
    }