:root {
      --red: #e7352f;
      --red-deep: #b91f27;
      --red-soft: #fff0ee;
      --ink: #201a1b;
      --muted: #756869;
      --line: #eadbd8;
      --paper: #fffaf8;
      --white: #ffffff;
      --dark: #24191b;
      --shadow: 0 14px 34px rgba(84, 24, 25, .1);
      --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% - 40px)); margin: 0 auto; }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(255,250,248,.96);
      border-bottom: 1px solid var(--line);
      backdrop-filter: blur(12px);
    }
    .nav-wrap {
      min-height: 74px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 22px;
    }
    .brand { display: flex; align-items: center; flex: 0 0 auto; }
    .ai-page-logo { width: 142px; }
    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 0;
      flex-wrap: wrap;
      color: #4f4142;
      font-size: 13px;
    }
    .nav-links a {
      padding: 8px 9px;
      transition: color .2s ease, background .2s ease;
    }
    .nav-links a:hover { color: var(--red); background: var(--red-soft); }
    .nav-cta, .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: 1px solid var(--red);
      background: var(--red);
      color: var(--white);
      padding: 11px 18px;
      border-radius: 5px;
      font-weight: 700;
      cursor: pointer;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .nav-cta:hover, .button:hover { transform: translateY(-2px); box-shadow: 0 8px 18px rgba(231,53,47,.24); }
    .button.alt { color: var(--red-deep); background: var(--white); }
    .button.dark { background: var(--dark); border-color: var(--dark); }
    .menu-toggle {
      display: none;
      border: 1px solid var(--line);
      background: var(--white);
      color: var(--ink);
      padding: 8px 11px;
      border-radius: 4px;
      cursor: pointer;
    }
    .hero {
      position: relative;
      overflow: hidden;
      background: var(--red);
      color: var(--white);
      padding: 86px 0 74px;
    }
    .hero:before, .hero:after {
      content: "";
      position: absolute;
      pointer-events: none;
      border: 1px solid rgba(255,255,255,.22);
      transform: rotate(24deg);
    }
    .hero:before { width: 290px; height: 290px; right: 5%; top: -100px; }
    .hero:after { width: 170px; height: 170px; left: 55%; bottom: -90px; }
    .hero-grid {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: minmax(0, 1.15fr) minmax(300px, .85fr);
      align-items: center;
      gap: 60px;
    }
    .eyebrow {
      margin: 0 0 15px;
      color: #ffd8d3;
      font-size: 13px;
      letter-spacing: 2px;
      font-weight: 700;
    }
    h1, h2, h3, p { margin-top: 0; }
    h1 { max-width: 650px; margin-bottom: 18px; font-size: clamp(38px, 6vw, 74px); line-height: 1.12; letter-spacing: 0; }
    .hero-copy { max-width: 650px; color: #fff1ef; font-size: 18px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
    .hero .button { border-color: var(--white); background: var(--white); color: var(--red-deep); }
    .hero .button.alt { border-color: rgba(255,255,255,.7); background: transparent; color: var(--white); }
    .hero-panel {
      padding: 25px;
      border: 1px solid rgba(255,255,255,.34);
      background: rgba(110, 10, 20, .25);
      border-radius: 8px;
    }
    .hero-panel strong { display: block; margin-bottom: 5px; font-size: 29px; }
    .hero-panel p { color: #ffe5e1; margin-bottom: 18px; }
    .signal-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .signal-list div { padding: 12px; border-left: 3px solid #ffd0ca; background: rgba(255,255,255,.1); font-size: 14px; }
    .section { padding: 82px 0; }
    .section.tint { background: #fff1ee; }
    .section.dark { background: var(--dark); color: var(--white); }
    .section-head { display: flex; justify-content: space-between; align-items: end; gap: 30px; margin-bottom: 34px; }
    .section-head h2 { max-width: 650px; margin-bottom: 0; font-size: clamp(28px, 4vw, 45px); line-height: 1.2; }
    .section-head p { max-width: 560px; margin-bottom: 0; color: var(--muted); }
    .dark .section-head p { color: #d9c9c8; }
    .kicker { color: var(--red); font-size: 13px; font-weight: 800; letter-spacing: 1.5px; margin-bottom: 9px; }
    .metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
    .metric { padding: 25px; background: var(--white); border-top: 4px solid var(--red); box-shadow: var(--shadow); }
    .metric strong { display: block; color: var(--red-deep); font-size: 34px; line-height: 1.2; }
    .metric span { color: var(--muted); font-size: 14px; }
    .about-grid, .contact-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 48px; align-items: start; }
    .about-lead { font-size: 22px; line-height: 1.55; }
    .about-copy p { color: var(--muted); }
    .feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 13px; margin: 24px 0 0; padding: 0; list-style: none; }
    .feature-list li { padding: 16px; background: var(--white); border: 1px solid var(--line); }
    .feature-list b { display: block; margin-bottom: 4px; color: var(--red-deep); }
    .service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
    .service-card { padding: 22px; background: var(--white); border: 1px solid var(--line); transition: transform .25s ease, box-shadow .25s ease; }
    .service-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
    .service-card .num { color: var(--red); font-size: 13px; font-weight: 800; }
    .service-card h3 { margin: 10px 0 7px; font-size: 19px; }
    .service-card p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .wide-showcase { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
    .showcase-item { min-height: 270px; padding: 30px; background: var(--white); border-left: 6px solid var(--red); box-shadow: var(--shadow); }
    .showcase-item h3 { font-size: 26px; margin-bottom: 10px; }
    .showcase-item p { color: var(--muted); }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 23px; }
    .tag-cloud span { padding: 7px 12px; border: 1px solid #efb4ae; color: var(--red-deep); background: #fff9f7; font-size: 13px; }
    .steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; border-top: 1px solid var(--line); }
    .step { position: relative; padding: 26px 18px 10px 0; margin-right: 18px; }
    .step:before { content: ""; position: absolute; top: -7px; left: 0; width: 12px; height: 12px; background: var(--red); border-radius: 50%; }
    .step strong { display: block; margin-bottom: 9px; font-size: 18px; }
    .step p { color: var(--muted); font-size: 14px; }
    .solution-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
    .solution { padding: 24px; background: #2c2022; border: 1px solid #594144; }
    .solution h3 { color: #ffd7d2; font-size: 20px; }
    .solution p { color: #ddc8c6; font-size: 14px; margin-bottom: 0; }
    .media-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 18px; align-items: stretch; }
    .media-main, .media-side { background: var(--white); border: 1px solid var(--line); overflow: hidden; }
    .media-main img, .media-side img { width: 100%; object-fit: cover; aspect-ratio: 16 / 8; }
    .media-side img { aspect-ratio: 1 / 1; }
    .media-copy { padding: 22px; }
    .media-copy p { color: var(--muted); margin-bottom: 0; }
    .compare-wrap { overflow-x: auto; background: var(--white); border: 1px solid var(--line); }
    table { width: 100%; min-width: 760px; border-collapse: collapse; }
    th, td { padding: 15px 17px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
    th { background: var(--red); color: var(--white); font-size: 14px; }
    td { font-size: 14px; }
    tr:last-child td { border-bottom: 0; }
    .rating { display: flex; align-items: center; gap: 22px; margin-bottom: 22px; }
    .rating strong { font-size: 46px; color: var(--red); line-height: 1; }
    .stars { color: #e99c24; letter-spacing: 3px; font-size: 21px; }
    .price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; }
    .price-card { padding: 25px; background: var(--white); border: 1px solid var(--line); }
    .price-card.featured { border: 2px solid var(--red); }
    .price-card h3 { margin-bottom: 9px; }
    .price-card strong { display: block; color: var(--red-deep); font-size: 29px; margin-bottom: 12px; }
    .price-card p { color: var(--muted); font-size: 14px; }
    .review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
    .review { padding: 23px; background: var(--white); border: 1px solid var(--line); }
    .review p { color: #4f4142; }
    .review footer { color: var(--red-deep); font-size: 13px; font-weight: 700; }
    .faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 11px 24px; }
    details { background: var(--white); border: 1px solid var(--line); }
    summary { padding: 17px 19px; cursor: pointer; font-weight: 700; list-style: none; }
    summary::-webkit-details-marker { display: none; }
    summary:after { content: "+"; float: right; color: var(--red); font-size: 20px; line-height: 1; }
    details[open] summary:after { content: "−"; }
    details p { padding: 0 19px 17px; margin: 0; color: var(--muted); font-size: 14px; }
    .article-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
    .article { padding: 22px; background: var(--white); border-bottom: 3px solid var(--red); }
    .article small { color: var(--red); }
    .article h3 { margin: 10px 0; font-size: 18px; }
    .article p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .form-box { padding: 30px; background: var(--white); border: 1px solid var(--line); box-shadow: var(--shadow); }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
    .field { display: flex; flex-direction: column; gap: 7px; }
    .field.full { grid-column: 1 / -1; }
    label { font-size: 14px; font-weight: 700; }
    input, select, textarea { width: 100%; border: 1px solid #d9c7c4; border-radius: 3px; padding: 12px 13px; background: #fffdfc; color: var(--ink); outline: none; }
    input:focus, select:focus, textarea:focus { border-color: var(--red); box-shadow: 0 0 0 3px rgba(231,53,47,.1); }
    textarea { min-height: 130px; resize: vertical; }
    .contact-info { padding-top: 7px; }
    .contact-info h3 { font-size: 28px; }
    .contact-info p { color: var(--muted); }
    .contact-list { list-style: none; padding: 0; margin: 25px 0 0; }
    .contact-list li { padding: 11px 0; border-bottom: 1px solid var(--line); }
    .qr-box { display: flex; align-items: center; gap: 16px; margin-top: 21px; }
    .qr-box img { width: 112px; border: 5px solid var(--white); box-shadow: var(--shadow); }
    .footer { background: #1f1718; color: #f9e9e6; padding: 45px 0 22px; }
    .footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 34px; }
    .footer h3 { color: #fff; font-size: 18px; }
    .footer p, .footer li { color: #cbb8b6; font-size: 14px; }
    .footer ul { list-style: none; padding: 0; margin: 0; }
    .footer li { margin: 7px 0; }
    .footer a:hover { color: #ffb4ae; }
    .footer-bottom { margin-top: 32px; padding-top: 17px; border-top: 1px solid #493538; color: #a58d8b; font-size: 12px; }
    .float-contact, .back-top { position: fixed; right: 20px; z-index: 15; border: 0; cursor: pointer; box-shadow: 0 8px 24px rgba(0,0,0,.18); }
    .float-contact { bottom: 76px; padding: 13px 16px; background: var(--red); color: var(--white); border-radius: 4px; font-weight: 700; }
    .back-top { bottom: 20px; display: none; padding: 9px 12px; background: var(--dark); color: var(--white); border-radius: 4px; }
    .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 { display: none; position: absolute; top: 74px; left: 0; right: 0; padding: 12px 20px 18px; background: var(--paper); border-bottom: 1px solid var(--line); }
      .nav-links.open { display: grid; grid-template-columns: repeat(3, 1fr); }
      .nav-links a { padding: 10px; }
      .menu-toggle { display: block; }
      .nav-cta { display: none; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 760px) {
      .container { width: min(var(--container), calc(100% - 28px)); }
      .hero { padding: 62px 0 55px; }
      .hero-grid, .about-grid, .contact-grid, .media-grid { grid-template-columns: 1fr; gap: 28px; }
      .hero-panel { max-width: 520px; }
      .metrics, .solution-grid, .price-grid, .review-grid, .article-grid { grid-template-columns: 1fr 1fr; }
      .section { padding: 60px 0; }
      .section-head { display: block; }
      .section-head p { margin-top: 14px; }
      .steps { grid-template-columns: 1fr; border-top: 0; border-left: 1px solid var(--line); padding-left: 22px; }
      .step { padding: 0 0 23px; margin: 0; }
      .step:before { top: 5px; left: -29px; }
      .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 520px) {
      .nav-links.open { grid-template-columns: 1fr 1fr; }
      .signal-list, .feature-list, .form-grid, .metrics, .service-grid, .solution-grid, .price-grid, .review-grid, .article-grid, .footer-grid { grid-template-columns: 1fr; }
      h1 { font-size: 42px; }
      .hero-copy { font-size: 16px; }
      .form-box { padding: 20px; }
      .float-contact { right: 13px; bottom: 68px; }
      .back-top { right: 13px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *:before, *:after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
    }