:root {
      --ink: #172033;
      --muted: #657083;
      --paper: #f7f9fc;
      --white: #ffffff;
      --line: #dfe5ef;
      --cyan: #00b7d9;
      --blue: #4779ff;
      --pink: #ef4f9a;
      --violet: #7657ed;
      --lime: #b4d94b;
      --deep: #17233e;
      --shadow: 0 18px 48px rgba(33, 53, 94, .11);
      --radius: 16px;
      --container: 1180px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", 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: min(var(--container), calc(100% - 36px)); margin: 0 auto; }
    .topbar {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(255,255,255,.94);
      border-bottom: 1px solid rgba(223,229,239,.9);
      backdrop-filter: blur(16px);
    }
    .nav {
      min-height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }
    .brand { display: inline-flex; align-items: center; gap: 12px; flex-shrink: 0; }
    .ai-page-logo { width: 126px; }
    .brand-name { font-size: 18px; font-weight: 800; letter-spacing: 0; }
    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 0;
      flex-wrap: wrap;
    }
    .nav-links a {
      padding: 9px 10px;
      color: #4f5b70;
      font-size: 13px;
      transition: color .2s ease, transform .2s ease;
    }
    .nav-links a:hover { color: var(--blue); transform: translateY(-1px); }
    .nav-cta, .primary-btn, .secondary-btn {
      border: 0;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border-radius: 9px;
      font-weight: 700;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .nav-cta {
      padding: 11px 16px;
      color: #fff;
      background: var(--blue);
      margin-left: 10px;
      font-size: 13px;
    }
    .primary-btn {
      padding: 14px 22px;
      color: #fff;
      background: linear-gradient(100deg, var(--blue), var(--violet));
      box-shadow: 0 10px 24px rgba(71,121,255,.25);
    }
    .secondary-btn {
      padding: 13px 21px;
      color: var(--blue);
      background: #fff;
      border: 1px solid #b9c8ef;
    }
    .nav-cta:hover, .primary-btn:hover, .secondary-btn:hover { transform: translateY(-2px); box-shadow: 0 13px 25px rgba(71,121,255,.22); }
    .menu-toggle { display: none; background: none; border: 0; font-size: 26px; color: var(--ink); }
    .hero {
      position: relative;
      overflow: hidden;
      background:
        linear-gradient(116deg, #eef7ff 0%, #fff 46%, #fff2f8 100%);
      border-bottom: 1px solid #e5eaf4;
    }
    .hero:before, .hero:after {
      content: "";
      position: absolute;
      width: 290px;
      height: 290px;
      border-radius: 50%;
      filter: blur(5px);
      opacity: .28;
      pointer-events: none;
    }
    .hero:before { background: #6dddf0; right: -90px; top: -100px; }
    .hero:after { background: #f49ccb; left: -130px; bottom: -160px; }
    .hero-inner {
      position: relative;
      z-index: 1;
      min-height: 620px;
      display: grid;
      grid-template-columns: minmax(0, 1.1fr) minmax(360px, .9fr);
      align-items: center;
      gap: 70px;
      padding: 78px 0 70px;
    }
    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: #3452a4;
      font-size: 13px;
      font-weight: 800;
      letter-spacing: 1px;
      margin-bottom: 15px;
    }
    .eyebrow:before { content: ""; width: 24px; height: 3px; background: var(--pink); }
    h1, h2, h3, p { margin-top: 0; }
    h1 {
      max-width: 680px;
      margin-bottom: 22px;
      font-size: clamp(38px, 5.2vw, 68px);
      line-height: 1.12;
      letter-spacing: 0;
    }
    .hero-copy {
      max-width: 620px;
      color: #536078;
      font-size: 18px;
      margin-bottom: 30px;
    }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
    .hero-note { margin-top: 18px; color: #6f7b91; font-size: 13px; }
    .hero-panel {
      position: relative;
      padding: 26px;
      border: 1px solid rgba(255,255,255,.8);
      background: rgba(255,255,255,.72);
      box-shadow: var(--shadow);
      border-radius: 20px;
    }
    .hero-panel h3 { margin-bottom: 18px; font-size: 20px; }
    .action-line {
      display: flex;
      align-items: flex-start;
      gap: 13px;
      padding: 14px 0;
      border-bottom: 1px solid #e5eaf3;
    }
    .action-line:last-child { border-bottom: 0; }
    .action-num {
      width: 30px;
      height: 30px;
      display: grid;
      place-items: center;
      flex: 0 0 30px;
      border-radius: 50%;
      color: #fff;
      background: var(--pink);
      font-weight: 800;
      font-size: 13px;
    }
    .action-line strong { display: block; font-size: 15px; }
    .action-line span { color: var(--muted); font-size: 13px; }
    .metrics { padding: 32px 0; background: #fff; border-bottom: 1px solid var(--line); }
    .metrics-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
    .metric { padding: 8px 25px; border-right: 1px solid var(--line); }
    .metric:first-child { padding-left: 0; }
    .metric:last-child { border-right: 0; }
    .metric strong { display: block; color: var(--blue); font-size: 31px; line-height: 1.2; }
    .metric span { color: var(--muted); font-size: 13px; }
    .section { padding: 92px 0; }
    .section.alt { background: #fff; }
    .section.dark {
      color: #fff;
      background: linear-gradient(135deg, #182442, #253863 54%, #403879);
    }
    .section-head { max-width: 700px; margin-bottom: 38px; }
    .section-head h2 { margin-bottom: 12px; font-size: clamp(28px, 3.2vw, 43px); line-height: 1.2; }
    .section-head p { color: var(--muted); }
    .dark .section-head p { color: #cbd5ec; }
    .section-kicker { color: var(--pink); font-size: 13px; font-weight: 800; letter-spacing: 1px; text-transform: uppercase; }
    .about-grid { display: grid; grid-template-columns: 1fr 1.05fr; align-items: start; gap: 52px; }
    .about-grid p { color: var(--muted); }
    .principles { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
    .principle { padding: 20px; background: #f5f8ff; border-left: 4px solid var(--cyan); }
    .principle:nth-child(2) { border-color: var(--pink); }
    .principle:nth-child(3) { border-color: var(--violet); }
    .principle:nth-child(4) { border-color: var(--lime); }
    .principle strong { display: block; margin-bottom: 6px; }
    .principle span { color: var(--muted); font-size: 14px; }
    .service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .service-card {
      padding: 25px;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
    }
    .service-card:hover { transform: translateY(-5px); border-color: #9eb8f4; box-shadow: var(--shadow); }
    .service-icon { font-size: 25px; margin-bottom: 14px; }
    .service-card h3 { margin-bottom: 8px; font-size: 19px; }
    .service-card p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .tag-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
    .tag { padding: 5px 10px; border-radius: 6px; color: #3b5b9f; background: #edf3ff; font-size: 12px; }
    .workflow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; counter-reset: step; }
    .step { position: relative; padding: 0 20px 0 0; }
    .step:not(:last-child):after {
      content: "";
      position: absolute;
      top: 21px;
      left: 46px;
      right: 15px;
      height: 1px;
      background: #9bb8ff;
    }
    .step-number {
      position: relative;
      z-index: 1;
      width: 43px;
      height: 43px;
      display: grid;
      place-items: center;
      margin-bottom: 20px;
      border-radius: 50%;
      color: #fff;
      background: var(--blue);
      font-weight: 800;
    }
    .step h3 { font-size: 17px; margin-bottom: 7px; }
    .step p { color: var(--muted); font-size: 13px; padding-right: 12px; }
    .solution-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 34px; align-items: start; }
    .solution-list { display: grid; gap: 12px; }
    .solution-item {
      display: grid;
      grid-template-columns: 130px 1fr;
      gap: 16px;
      padding: 17px 0;
      border-bottom: 1px solid var(--line);
    }
    .solution-item strong { color: var(--blue); }
    .solution-item span { color: var(--muted); font-size: 14px; }
    .network {
      padding: 26px;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius);
    }
    .network h3 { margin-bottom: 18px; }
    .model-cloud { display: flex; flex-wrap: wrap; gap: 9px; }
    .model-cloud span { padding: 8px 11px; color: #394765; background: #f0f4fb; border-radius: 7px; font-size: 13px; }
    .timeline { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
    .timeline-item { padding-top: 16px; border-top: 3px solid var(--cyan); }
    .timeline-item:nth-child(2) { border-color: var(--pink); }
    .timeline-item:nth-child(3) { border-color: var(--violet); }
    .timeline-item:nth-child(4) { border-color: var(--lime); }
    .timeline-item b { color: var(--muted); font-size: 12px; }
    .timeline-item h3 { margin: 7px 0; font-size: 17px; }
    .timeline-item p { color: var(--muted); font-size: 14px; }
    .case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .case-card { overflow: hidden; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); }
    .case-image { aspect-ratio: 16 / 9; overflow: hidden; background: #e9effc; }
    .case-image img { width: 100%; height: 100%; object-fit: cover; }
    .case-body { padding: 20px; }
    .case-body h3 { margin-bottom: 7px; font-size: 18px; }
    .case-body p { color: var(--muted); margin-bottom: 0; font-size: 14px; }
    .compare-wrap { overflow-x: auto; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); }
    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 { color: #fff; background: var(--deep); font-weight: 700; }
    td:first-child { color: var(--ink); font-weight: 700; background: #f6f8fd; }
    tr:last-child td { border-bottom: 0; }
    .rating {
      display: flex;
      align-items: center;
      gap: 18px;
      padding: 24px;
      margin-bottom: 24px;
      color: #fff;
      background: linear-gradient(110deg, #243d72, #5c4b9a);
      border-radius: var(--radius);
    }
    .rating strong { font-size: 38px; line-height: 1; }
    .stars { color: #ffe07d; letter-spacing: 3px; font-size: 22px; }
    .rating span { color: #e3e8fb; font-size: 13px; }
    .match-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 30px; align-items: start; }
    .price-board { padding: 28px; color: #fff; background: linear-gradient(135deg, #1b2f57, #273d70); border-radius: var(--radius); }
    .price-board h3 { margin-bottom: 10px; }
    .price-board p { color: #cad5ee; font-size: 14px; }
    .price-row { display: flex; justify-content: space-between; gap: 15px; padding: 13px 0; border-bottom: 1px solid rgba(255,255,255,.18); font-size: 14px; }
    .price-row:last-child { border-bottom: 0; }
    .price-row b { color: #a9f1f2; }
    .form-card { padding: 28px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); }
    .form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 15px; }
    .field { display: grid; gap: 6px; }
    .field.full { grid-column: 1 / -1; }
    label { color: #44516a; font-size: 13px; font-weight: 700; }
    input, select, textarea { width: 100%; padding: 12px 13px; color: var(--ink); background: #fbfcff; border: 1px solid #d8dfeb; border-radius: 7px; outline: none; }
    textarea { min-height: 115px; resize: vertical; }
    input:focus, select:focus, textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(71,121,255,.12); }
    .form-submit { margin-top: 18px; }
    .faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 34px; align-items: start; }
    details { background: #fff; border-bottom: 1px solid var(--line); }
    summary { padding: 17px 28px 17px 0; cursor: pointer; list-style: none; position: relative; font-weight: 700; }
    summary::-webkit-details-marker { display: none; }
    summary:after { content: "+"; position: absolute; right: 2px; color: var(--blue); font-size: 22px; font-weight: 400; }
    details[open] summary:after { content: "−"; }
    details p { margin: 0; padding: 0 25px 18px 0; color: var(--muted); font-size: 14px; }
    .review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .review { padding: 23px; background: #fff; border: 1px solid var(--line); border-radius: 14px; }
    .review-top { display: flex; justify-content: space-between; gap: 10px; margin-bottom: 13px; }
    .review strong { font-size: 15px; }
    .review small { color: var(--blue); }
    .review p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .article-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .article { padding: 23px; background: #fff; border: 1px solid var(--line); border-radius: 13px; }
    .article b { color: var(--pink); font-size: 12px; }
    .article h3 { margin: 9px 0; font-size: 18px; }
    .article p { color: var(--muted); font-size: 14px; margin-bottom: 15px; }
    .article a { color: var(--blue); font-size: 13px; font-weight: 700; }
    .join-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 25px;
      padding: 34px;
      color: #fff;
      background: linear-gradient(110deg, #ee559d, #7058e9);
      border-radius: 18px;
    }
    .join-banner h2 { margin-bottom: 7px; font-size: 28px; }
    .join-banner p { margin-bottom: 0; color: #ffeaf5; }
    .join-banner .secondary-btn { color: #75275d; background: #fff; border: 0; }
    .footer { padding: 58px 0 25px; color: #d9e2f4; background: #17233e; }
    .footer-grid { display: grid; grid-template-columns: 1.2fr .8fr .9fr 1fr; gap: 35px; }
    .footer h3 { color: #fff; font-size: 16px; margin-bottom: 15px; }
    .footer p, .footer a { color: #b8c5dc; font-size: 13px; }
    .footer a { display: block; margin: 7px 0; }
    .footer a:hover { color: #7be4ee; }
    .qr { width: 115px; background: #fff; padding: 6px; }
    .copyright { margin-top: 40px; padding-top: 19px; border-top: 1px solid rgba(255,255,255,.16); color: #95a6c3; font-size: 12px; }
    .float-actions { position: fixed; z-index: 15; right: 20px; bottom: 22px; display: grid; gap: 9px; }
    .float-actions a { width: 47px; height: 47px; display: grid; place-items: center; color: #fff; background: var(--blue); border-radius: 50%; box-shadow: 0 8px 20px rgba(37,71,147,.25); font-size: 18px; }
    .float-actions a:last-child { background: var(--pink); }
    .reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }
    @media (max-width: 1000px) {
      .nav-links { display: none; position: absolute; left: 18px; right: 18px; top: 70px; padding: 14px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); border-radius: 10px; }
      .nav-links.open { display: grid; grid-template-columns: repeat(2, 1fr); }
      .nav-links a { padding: 10px; }
      .nav-cta { margin: 5px 0 0; }
      .menu-toggle { display: block; }
      .hero-inner { grid-template-columns: 1fr; gap: 34px; min-height: auto; }
      .workflow { grid-template-columns: repeat(3, 1fr); gap: 26px 12px; }
      .step:after { display: none; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 720px) {
      .container { width: min(var(--container), calc(100% - 28px)); }
      .section { padding: 64px 0; }
      .hero-inner { padding: 60px 0 52px; }
      h1 { font-size: 42px; }
      .hero-copy { font-size: 16px; }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); gap: 18px 0; }
      .metric { padding: 4px 15px; border-right: 0; }
      .metric:nth-child(odd) { padding-left: 0; }
      .metric strong { font-size: 27px; }
      .about-grid, .solution-grid, .match-grid { grid-template-columns: 1fr; gap: 28px; }
      .service-grid, .case-grid, .review-grid, .article-grid { grid-template-columns: 1fr; }
      .principles { grid-template-columns: 1fr; }
      .workflow { grid-template-columns: 1fr 1fr; }
      .timeline { grid-template-columns: 1fr 1fr; }
      .faq-grid { grid-template-columns: 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .field.full { grid-column: auto; }
      .join-banner { display: block; padding: 27px; }
      .join-banner .secondary-btn { margin-top: 20px; }
      .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px 16px; }
      .solution-item { grid-template-columns: 1fr; gap: 3px; }
    }
    @media (max-width: 440px) {
      .brand-name { display: none; }
      .workflow, .timeline, .footer-grid { grid-template-columns: 1fr; }
      .hero-actions a { width: 100%; }
      .rating { align-items: flex-start; flex-wrap: wrap; }
    }