:root {
      --ink: #202638;
      --muted: #657084;
      --paper: #fffaf4;
      --surface: #ffffff;
      --line: #e8e5df;
      --orange: #ff7347;
      --yellow: #f6c746;
      --teal: #20a995;
      --blue: #4177d6;
      --violet: #8064cc;
      --pink: #ef6fa7;
      --shadow: 0 18px 45px rgba(36, 46, 70, .09);
      --radius: 18px;
      --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", "Hiragino Sans GB", "Microsoft YaHei", Arial, 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% - 40px)); margin: 0 auto; }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(255, 250, 244, .94);
      border-bottom: 1px solid rgba(232, 229, 223, .85);
      backdrop-filter: blur(14px);
    }
    .nav-wrap {
      min-height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 26px;
    }
    .brand { display: inline-flex; align-items: center; gap: 11px; flex-shrink: 0; }
    .ai-page-logo { width: 42px; max-width: 100%; height: auto; }
    .brand-name { font-size: 18px; font-weight: 800; letter-spacing: 0; }
    .brand-sub { display: block; color: var(--muted); font-size: 11px; line-height: 1.2; 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: #465066;
      font-size: 13px;
      white-space: nowrap;
      transition: color .2s ease, background .2s ease;
    }
    .nav-links a:hover { color: var(--orange); background: #fff0e8; border-radius: 8px; }
    .nav-cta, .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      min-height: 44px;
      padding: 10px 18px;
      border: 0;
      border-radius: 10px;
      background: var(--orange);
      color: #fff;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 10px 20px rgba(255, 115, 71, .2);
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .nav-cta { margin-left: 10px; min-height: 40px; padding: 8px 15px; font-size: 13px; }
    .button:hover, .nav-cta:hover { transform: translateY(-2px); background: #e95d32; box-shadow: 0 13px 24px rgba(255, 115, 71, .28); }
    .button.secondary { background: #fff; color: var(--ink); border: 1px solid var(--line); box-shadow: none; }
    .button.secondary:hover { border-color: var(--orange); color: var(--orange); background: #fff8f3; }
    .menu-toggle { display: none; border: 1px solid var(--line); background: #fff; border-radius: 9px; padding: 8px 10px; color: var(--ink); }
    .hero {
      position: relative;
      overflow: hidden;
      padding: 92px 0 66px;
      background: #fffaf4;
      border-bottom: 1px solid var(--line);
    }
    .hero:before, .hero:after {
      content: "";
      position: absolute;
      pointer-events: none;
      border-radius: 50%;
      opacity: .7;
    }
    .hero:before { width: 260px; height: 260px; right: -90px; top: 25px; border: 34px solid #f6c746; }
    .hero:after { width: 180px; height: 180px; left: -70px; bottom: -70px; border: 25px solid #60cfc2; }
    .hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1.05fr .95fr; gap: 62px; align-items: center; }
    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: var(--orange);
      font-weight: 800;
      font-size: 14px;
      margin-bottom: 18px;
    }
    .eyebrow:before { content: ""; width: 26px; height: 4px; background: var(--yellow); border-radius: 4px; }
    h1, h2, h3, p { margin-top: 0; }
    h1 { max-width: 600px; margin-bottom: 22px; font-size: clamp(38px, 5vw, 68px); line-height: 1.12; letter-spacing: 0; }
    .hero-copy { max-width: 620px; color: var(--muted); font-size: 18px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 30px 0 28px; }
    .hero-note { color: #7b8290; font-size: 13px; }
    .hero-panel { position: relative; padding: 28px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); border-radius: 26px; }
    .hero-panel:before { content: ""; position: absolute; width: 64px; height: 8px; top: 0; left: 28px; background: var(--teal); border-radius: 0 0 8px 8px; }
    .panel-title { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 22px; }
    .panel-title strong { font-size: 20px; }
    .live-label { padding: 5px 9px; color: #177c6f; background: #e3f7f2; border-radius: 20px; font-size: 12px; font-weight: 700; }
    .signal { display: grid; gap: 13px; }
    .signal-row { display: grid; grid-template-columns: 86px 1fr auto; gap: 12px; align-items: center; font-size: 13px; }
    .signal-row span:first-child { color: var(--muted); }
    .bar { height: 9px; overflow: hidden; border-radius: 9px; background: #eef0f2; }
    .bar i { display: block; height: 100%; border-radius: inherit; background: var(--teal); }
    .signal-row:nth-child(2) .bar i { background: var(--orange); }
    .signal-row:nth-child(3) .bar i { background: var(--violet); }
    .signal-row:nth-child(4) .bar i { background: var(--yellow); }
    .hero-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--line); }
    .tag { padding: 6px 10px; color: #4d5669; background: #f5f3ef; border-radius: 7px; font-size: 12px; }
    .section { padding: 88px 0; }
    .section.tint { background: #f7f7f3; }
    .section.white { background: #fff; }
    .section-head { display: flex; justify-content: space-between; align-items: end; gap: 28px; margin-bottom: 34px; }
    .section-kicker { color: var(--teal); font-size: 13px; font-weight: 800; letter-spacing: 1px; }
    h2 { margin: 8px 0 12px; font-size: clamp(28px, 3.3vw, 44px); line-height: 1.2; }
    .section-intro { max-width: 690px; color: var(--muted); }
    .metric-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
    .metric { padding: 25px 22px; background: #fff; border: 1px solid var(--line); border-top: 4px solid var(--orange); border-radius: 14px; }
    .metric:nth-child(2) { border-top-color: var(--yellow); }
    .metric:nth-child(3) { border-top-color: var(--teal); }
    .metric:nth-child(4) { border-top-color: var(--violet); }
    .metric strong { display: block; margin-bottom: 4px; font-size: 31px; }
    .metric span { color: var(--muted); font-size: 13px; }
    .about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 42px; align-items: start; }
    .about-copy p { color: var(--muted); }
    .principles { display: grid; grid-template-columns: repeat(2, 1fr); gap: 13px; }
    .principle { padding: 19px; background: #fff; border-left: 4px solid var(--blue); border-radius: 10px; box-shadow: 0 8px 24px rgba(36,46,70,.05); }
    .principle:nth-child(2) { border-left-color: var(--pink); }
    .principle:nth-child(3) { border-left-color: var(--yellow); }
    .principle:nth-child(4) { border-left-color: var(--teal); }
    .principle strong { display: block; margin-bottom: 5px; }
    .principle span { color: var(--muted); font-size: 13px; }
    .service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
    .service-card { padding: 24px 21px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); transition: transform .25s ease, box-shadow .25s ease; }
    .service-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
    .service-icon { display: inline-grid; place-items: center; width: 42px; height: 42px; margin-bottom: 16px; background: #fff1df; color: var(--orange); border-radius: 12px; font-weight: 800; }
    .service-card:nth-child(2) .service-icon { background: #e6f7f3; color: var(--teal); }
    .service-card:nth-child(3) .service-icon { background: #eeeafd; color: var(--violet); }
    .service-card:nth-child(4) .service-icon { background: #fff1f5; color: var(--pink); }
    .service-card h3 { margin-bottom: 7px; font-size: 18px; }
    .service-card p { margin-bottom: 0; color: var(--muted); font-size: 14px; }
    .workflow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; border-top: 2px solid #dfe5e5; }
    .step { position: relative; padding: 26px 18px 0 0; }
    .step:before { content: ""; position: absolute; top: -9px; left: 0; width: 16px; height: 16px; border: 4px solid var(--paper); background: var(--teal); border-radius: 50%; box-shadow: 0 0 0 2px var(--teal); }
    .step:nth-child(2):before { background: var(--orange); box-shadow: 0 0 0 2px var(--orange); }
    .step:nth-child(3):before { background: var(--yellow); box-shadow: 0 0 0 2px var(--yellow); }
    .step:nth-child(4):before { background: var(--blue); box-shadow: 0 0 0 2px var(--blue); }
    .step:nth-child(5):before { background: var(--violet); box-shadow: 0 0 0 2px var(--violet); }
    .step b { display: block; margin-bottom: 7px; font-size: 17px; }
    .step span { color: var(--muted); font-size: 13px; }
    .solution-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .solution { padding: 24px; background: #fff; border: 1px solid var(--line); border-radius: 14px; }
    .solution h3 { margin-bottom: 8px; font-size: 19px; }
    .solution p { color: var(--muted); font-size: 14px; }
    .solution ul { margin: 0; padding-left: 18px; color: #555f70; font-size: 14px; }
    .network { display: flex; flex-wrap: wrap; gap: 9px; padding: 25px; background: #fff; border: 1px solid var(--line); border-radius: 16px; }
    .model { padding: 9px 13px; color: #3f4b61; background: #f5f7fa; border-radius: 8px; font-size: 13px; }
    .model:nth-child(4n+1) { background: #fff0e7; }
    .model:nth-child(4n+2) { background: #e5f7f3; }
    .model:nth-child(4n+3) { background: #efebff; }
    .model:nth-child(4n+4) { background: #fff7d9; }
    .case-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 18px; }
    .case-feature, .case-list { background: #fff; border: 1px solid var(--line); border-radius: 16px; overflow: hidden; }
    .case-feature .image-wrap { aspect-ratio: 16 / 8; overflow: hidden; background: #f5f2ec; }
    .case-feature img, .case-list img { width: 100%; height: 100%; object-fit: cover; }
    .case-body { padding: 23px; }
    .case-body h3 { margin-bottom: 8px; }
    .case-body p { margin-bottom: 0; color: var(--muted); font-size: 14px; }
    .case-list { display: grid; grid-template-columns: 140px 1fr; min-height: 150px; }
    .case-list .image-wrap { overflow: hidden; background: #f5f2ec; }
    .case-list + .case-list { margin-top: 18px; }
    .case-list .case-body { padding: 18px; }
    .review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; }
    .review { padding: 22px; background: #fff; border: 1px solid var(--line); border-radius: 14px; }
    .stars { color: #eaa82d; letter-spacing: 2px; margin-bottom: 12px; }
    .review p { color: #555f70; font-size: 14px; }
    .review footer { color: var(--ink); font-size: 13px; font-weight: 700; }
    .comparison-wrap { overflow-x: auto; border: 1px solid var(--line); background: #fff; border-radius: 16px; }
    table { width: 100%; min-width: 760px; border-collapse: collapse; }
    th, td { padding: 16px 18px; border-bottom: 1px solid var(--line); text-align: left; font-size: 14px; vertical-align: top; }
    th { background: #fff3e9; color: var(--ink); }
    td:first-child { font-weight: 700; width: 22%; }
    tr:last-child td { border-bottom: 0; }
    .score-box { display: flex; align-items: center; gap: 20px; margin-bottom: 22px; padding: 20px 24px; background: #fff5da; border-left: 5px solid var(--yellow); border-radius: 12px; }
    .score-box strong { font-size: 34px; color: #b57b00; }
    .score-box span { color: #655b45; font-size: 14px; }
    .price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .price { padding: 25px; background: #fff; border: 1px solid var(--line); border-radius: 15px; }
    .price.featured { border: 2px solid var(--orange); transform: translateY(-5px); }
    .price h3 { margin-bottom: 8px; }
    .price .price-num { display: block; margin: 10px 0 4px; color: var(--orange); font-size: 27px; font-weight: 800; }
    .price p { color: var(--muted); font-size: 13px; }
    .article-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
    .article { padding: 18px; background: #fff; border: 1px solid var(--line); border-radius: 12px; }
    .article small { color: var(--orange); font-weight: 700; }
    .article h3 { margin: 9px 0 0; font-size: 15px; line-height: 1.5; }
    .faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 11px 18px; }
    details { padding: 17px 19px; background: #fff; border: 1px solid var(--line); border-radius: 11px; }
    summary { cursor: pointer; font-weight: 700; list-style-position: outside; }
    details p { margin: 11px 0 0 20px; color: var(--muted); font-size: 14px; }
    .contact-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 28px; align-items: start; }
    .contact-panel { padding: 28px; color: #fff; background: #26334a; border-radius: 18px; }
    .contact-panel h2 { color: #fff; }
    .contact-panel p { color: #d5dce7; }
    .contact-list { display: grid; gap: 12px; margin-top: 24px; }
    .contact-list div { padding: 12px 14px; background: rgba(255,255,255,.08); border-radius: 9px; color: #edf2f8; font-size: 14px; }
    .contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; padding: 28px; background: #fff; border: 1px solid var(--line); border-radius: 18px; }
    .field { display: grid; gap: 7px; }
    .field.full { grid-column: 1 / -1; }
    label { font-size: 13px; font-weight: 700; }
    input, select, textarea { width: 100%; padding: 12px 13px; color: var(--ink); background: #fffdf9; border: 1px solid #dfe0df; border-radius: 8px; outline: none; }
    input:focus, select:focus, textarea:focus { border-color: var(--orange); box-shadow: 0 0 0 3px rgba(255,115,71,.12); }
    textarea { min-height: 120px; resize: vertical; }
    .form-action { grid-column: 1 / -1; display: flex; align-items: center; gap: 15px; flex-wrap: wrap; }
    .form-note { color: var(--muted); font-size: 12px; }
    .join-band { display: flex; align-items: center; justify-content: space-between; gap: 25px; padding: 30px 34px; background: #e8f7f3; border: 1px solid #cdebe4; border-radius: 17px; }
    .join-band h2 { margin-bottom: 7px; font-size: 30px; }
    .join-band p { margin-bottom: 0; color: #4d6864; }
    .footer { padding: 44px 0 26px; color: #dce3ee; background: #202a3d; }
    .footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 35px; padding-bottom: 28px; }
    .footer h3 { color: #fff; font-size: 17px; }
    .footer p, .footer li, .footer a { color: #c2ccda; font-size: 13px; }
    .footer ul { margin: 0; padding: 0; list-style: none; columns: 2; }
    .footer li { margin-bottom: 7px; }
    .footer a:hover { color: #fff; }
    .copyright { padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12); color: #aeb9ca; font-size: 12px; }
    .float-tools { position: fixed; right: 18px; bottom: 22px; z-index: 15; display: grid; gap: 9px; }
    .float-tool { width: 48px; height: 48px; display: grid; place-items: center; color: #fff; background: var(--orange); border-radius: 50%; box-shadow: 0 10px 24px rgba(33,43,62,.18); font-size: 12px; text-align: center; }
    .float-tool.back { background: var(--blue); display: none; }
    .reveal { opacity: 0; transform: translateY(18px); transition: opacity .65s ease, transform .65s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }
    @media (max-width: 1050px) {
      .nav-links a { padding-left: 7px; padding-right: 7px; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .article-grid { grid-template-columns: repeat(3, 1fr); }
    }
    @media (max-width: 820px) {
      .container { width: min(var(--container), calc(100% - 28px)); }
      .menu-toggle { display: block; }
      .nav-links { display: none; position: absolute; left: 14px; right: 14px; top: 68px; padding: 12px; background: #fffaf4; border: 1px solid var(--line); box-shadow: var(--shadow); border-radius: 12px; }
      .nav-links.open { display: grid; grid-template-columns: 1fr 1fr; }
      .nav-links a { padding: 10px; }
      .nav-cta { margin: 8px 0 0; grid-column: 1 / -1; }
      .hero { padding: 65px 0 50px; }
      .hero-grid, .about-grid, .case-grid, .contact-grid { grid-template-columns: 1fr; gap: 30px; }
      .metric-grid { grid-template-columns: repeat(2, 1fr); }
      .workflow { grid-template-columns: 1fr; gap: 18px; border-top: 0; border-left: 2px solid #dfe5e5; padding-left: 24px; }
      .step { padding: 0; }
      .step:before { top: 2px; left: -33px; }
      .solution-grid { grid-template-columns: 1fr 1fr; }
      .review-grid { grid-template-columns: 1fr 1fr; }
      .price-grid { grid-template-columns: 1fr; }
      .price.featured { transform: none; }
      .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 560px) {
      h1 { font-size: 40px; }
      .hero-copy { font-size: 16px; }
      .section { padding: 62px 0; }
      .section-head { display: block; }
      .metric-grid, .service-grid, .solution-grid, .review-grid, .article-grid, .principles { grid-template-columns: 1fr; }
      .case-list { grid-template-columns: 105px 1fr; }
      .contact-form { grid-template-columns: 1fr; padding: 20px; }
      .field.full, .form-action { grid-column: auto; }
      .join-band { display: block; padding: 24px; }
      .join-band .button { margin-top: 18px; }
      .footer-grid { grid-template-columns: 1fr; gap: 18px; }
      .footer ul { columns: 2; }
      .float-tools { right: 12px; bottom: 14px; }
    }