:root {
      --ink: #18352c;
      --muted: #61776d;
      --mint: #dff5e8;
      --mint-strong: #2c9b6c;
      --green: #176847;
      --lime: #bde98b;
      --cream: #fbfdf9;
      --line: #d7e8dc;
      --white: #ffffff;
      --shadow: 0 16px 42px rgba(32, 94, 66, .10);
      --container: min(1180px, calc(100% - 36px));
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--cream);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
      line-height: 1.7;
    }
    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; height: auto; display: block; }
    .container { width: var(--container); margin: 0 auto; }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(251,253,249,.94);
      border-bottom: 1px solid rgba(215,232,220,.9);
      backdrop-filter: blur(14px);
    }
    .nav-wrap { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 22px; }
    .brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: var(--green); white-space: nowrap; }
    .ai-page-logo { width: 42px; max-height: 42px; object-fit: contain; }
    .nav-links { display: flex; align-items: center; gap: 0; flex-wrap: wrap; justify-content: flex-end; }
    .nav-links a { font-size: 13px; color: #476257; padding: 8px 10px; border-radius: 8px; }
    .nav-links a:hover { color: var(--green); background: var(--mint); }
    .nav-cta, .button-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: 0;
      border-radius: 8px;
      background: var(--green);
      color: #fff;
      padding: 12px 20px;
      font-weight: 700;
      cursor: pointer;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .nav-cta { margin-left: 10px; padding: 10px 15px; font-size: 13px; }
    .button-primary:hover, .nav-cta:hover { transform: translateY(-2px); background: #0f563a; box-shadow: 0 9px 20px rgba(23,104,71,.22); }
    .button-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: 1px solid #9bc9aa;
      border-radius: 8px;
      padding: 11px 19px;
      color: var(--green);
      font-weight: 700;
      background: rgba(255,255,255,.65);
    }
    .button-secondary:hover { background: var(--mint); }
    .menu-toggle { display: none; border: 1px solid var(--line); background: #fff; border-radius: 8px; padding: 8px 10px; color: var(--green); font-size: 20px; }
    .hero {
      position: relative;
      overflow: hidden;
      padding: 92px 0 76px;
      background: linear-gradient(135deg, #f5fff8 0%, #e8f8ee 58%, #d5f0df 100%);
    }
    .hero:before, .hero:after {
      content: "";
      position: absolute;
      border: 1px solid rgba(44,155,108,.16);
      border-radius: 50%;
      pointer-events: none;
    }
    .hero:before { width: 430px; height: 430px; right: -160px; top: -180px; }
    .hero:after { width: 250px; height: 250px; left: -120px; bottom: -150px; }
    .hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1.05fr .95fr; gap: 62px; align-items: center; }
    .eyebrow { color: var(--mint-strong); font-size: 13px; font-weight: 800; letter-spacing: .12em; margin: 0 0 14px; }
    h1, h2, h3 { line-height: 1.25; margin: 0; letter-spacing: 0; }
    h1 { max-width: 650px; font-size: clamp(36px, 5vw, 64px); color: #123d2c; }
    .hero-copy { max-width: 650px; color: #4c6b5c; font-size: 18px; margin: 22px 0 30px; }
    .hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
    .hero-panel { border-left: 3px solid var(--mint-strong); padding: 12px 0 12px 26px; }
    .hero-panel strong { display: block; color: var(--green); font-size: 24px; margin-bottom: 9px; }
    .hero-panel p { margin: 0; color: var(--muted); }
    .hero-points { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 28px; }
    .hero-point { padding: 16px; background: rgba(255,255,255,.62); border: 1px solid rgba(160,210,176,.55); border-radius: 12px; }
    .hero-point b { display: block; color: var(--green); font-size: 20px; }
    .hero-point span { color: var(--muted); font-size: 13px; }
    section { padding: 84px 0; }
    .section-head { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 34px; }
    .section-head h2 { font-size: clamp(28px, 4vw, 42px); color: #173d2d; }
    .section-head p { max-width: 560px; color: var(--muted); margin: 0; }
    .soft-band { background: #effaf2; }
    .stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 36px; }
    .stat { border-top: 3px solid var(--mint-strong); padding: 22px 18px; background: #fff; box-shadow: 0 8px 25px rgba(32,94,66,.06); }
    .stat strong { display: block; font-size: 30px; color: var(--green); }
    .stat span { color: var(--muted); font-size: 14px; }
    .intro-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 50px; align-items: start; }
    .intro-note { padding: 26px; background: var(--green); color: #effff4; border-radius: 14px; box-shadow: var(--shadow); }
    .intro-note h3 { font-size: 24px; margin-bottom: 12px; color: #fff; }
    .intro-note p { color: #d8f0df; margin: 0; }
    .feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px 28px; }
    .feature-item { padding-bottom: 18px; border-bottom: 1px solid var(--line); }
    .feature-item h3 { font-size: 18px; color: var(--green); margin-bottom: 6px; }
    .feature-item p { color: var(--muted); margin: 0; font-size: 14px; }
    .service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
    .service-card { background: #fff; padding: 22px; border: 1px solid var(--line); border-radius: 12px; transition: transform .2s ease, box-shadow .2s ease; }
    .service-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
    .service-icon { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 10px; background: var(--mint); color: var(--green); font-weight: 800; margin-bottom: 16px; }
    .service-card h3 { font-size: 18px; margin-bottom: 8px; }
    .service-card p { color: var(--muted); font-size: 14px; margin: 0; }
    .workflow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; border: 1px solid var(--line); background: #fff; }
    .step { padding: 25px 20px; border-right: 1px solid var(--line); position: relative; }
    .step:last-child { border-right: 0; }
    .step-number { color: var(--mint-strong); font-size: 13px; font-weight: 800; }
    .step h3 { margin: 10px 0 8px; font-size: 18px; }
    .step p { margin: 0; color: var(--muted); font-size: 13px; }
    .solution-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .solution { padding: 25px; background: #fff; border-radius: 12px; border: 1px solid var(--line); }
    .solution h3 { color: var(--green); font-size: 20px; margin-bottom: 9px; }
    .solution p { color: var(--muted); font-size: 14px; margin: 0; }
    .media-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
    .media-card { overflow: hidden; border-radius: 12px; background: #fff; border: 1px solid var(--line); }
    .media-card img { width: 100%; aspect-ratio: 16 / 8; object-fit: cover; }
    .media-card .media-text { padding: 17px 20px; }
    .media-text h3 { font-size: 19px; margin-bottom: 4px; }
    .media-text p { margin: 0; color: var(--muted); font-size: 14px; }
    .network { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
    .tag { padding: 9px 13px; border-radius: 99px; background: #fff; border: 1px solid var(--line); color: #3d6753; font-size: 13px; }
    .comparison-wrap { overflow-x: auto; background: #fff; border: 1px solid var(--line); }
    table { width: 100%; min-width: 720px; border-collapse: collapse; }
    th, td { padding: 17px 18px; text-align: left; border-bottom: 1px solid var(--line); font-size: 14px; }
    th { color: var(--green); background: #e9f8ed; }
    td:first-child { font-weight: 700; color: #285642; }
    tr:last-child td { border-bottom: 0; }
    .rating { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 22px; padding: 20px 24px; background: var(--green); color: #fff; }
    .rating strong { font-size: 32px; }
    .stars { color: #d5f28d; letter-spacing: 3px; font-size: 22px; }
    .price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .price-card { padding: 25px; background: #fff; border: 1px solid var(--line); border-top: 4px solid var(--mint-strong); }
    .price-card h3 { font-size: 20px; margin-bottom: 8px; }
    .price-card p { color: var(--muted); font-size: 14px; margin: 0 0 15px; }
    .price-card b { color: var(--green); }
    .reviews { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .review { background: #fff; padding: 22px; border: 1px solid var(--line); border-radius: 12px; }
    .review p { margin: 0 0 18px; color: #476257; font-size: 14px; }
    .review footer { color: var(--green); font-weight: 700; font-size: 13px; }
    .faq-list { display: grid; gap: 10px; max-width: 900px; }
    .faq-item { background: #fff; border: 1px solid var(--line); border-radius: 9px; overflow: hidden; }
    .faq-item summary { cursor: pointer; padding: 17px 20px; font-weight: 700; color: #24543d; list-style: none; display: flex; justify-content: space-between; gap: 20px; }
    .faq-item summary::-webkit-details-marker { display: none; }
    .faq-item summary:after { content: "+"; color: var(--mint-strong); font-size: 21px; line-height: 1; }
    .faq-item[open] summary:after { content: "−"; }
    .faq-answer { padding: 0 20px 18px; color: var(--muted); font-size: 14px; }
    .article-list { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
    .article-list a { padding: 18px; border: 1px solid var(--line); background: #fff; color: var(--green); font-weight: 700; font-size: 14px; min-height: 110px; }
    .article-list a:hover { background: var(--mint); }
    .contact-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 42px; align-items: start; }
    .contact-card { padding: 28px; background: var(--green); color: #fff; border-radius: 14px; }
    .contact-card h2 { color: #fff; margin-bottom: 13px; }
    .contact-card p { color: #d9f1df; margin: 8px 0; }
    .contact-card img { width: 150px; margin-top: 18px; border-radius: 8px; background: #fff; padding: 6px; }
    form { background: #fff; padding: 26px; border: 1px solid var(--line); }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
    label { display: block; color: #355c49; font-size: 13px; font-weight: 700; }
    input, select, textarea { width: 100%; margin-top: 6px; border: 1px solid #cfe2d4; border-radius: 7px; padding: 12px; color: var(--ink); background: #fcfffd; font: inherit; }
    textarea { min-height: 130px; resize: vertical; }
    .full { grid-column: 1 / -1; }
    .form-note { color: var(--muted); font-size: 12px; margin: 13px 0 0; }
    .footer { background: #173d2d; color: #dff3e4; padding: 45px 0 20px; }
    .footer-grid { display: grid; grid-template-columns: 1.1fr .9fr .9fr; gap: 35px; }
    .footer h3 { color: #fff; font-size: 18px; margin-bottom: 12px; }
    .footer p { color: #b9d9c2; margin: 6px 0; font-size: 14px; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 9px 16px; }
    .footer-links a { color: #c6e7ce; font-size: 13px; }
    .footer-links a:hover { color: #fff; }
    .copyright { border-top: 1px solid rgba(220,245,225,.18); margin-top: 30px; padding-top: 17px; color: #a9cbb3; font-size: 12px; }
    .float-contact { position: fixed; right: 18px; bottom: 20px; z-index: 15; }
    .float-contact a { display: flex; align-items: center; gap: 8px; background: var(--green); color: #fff; padding: 12px 15px; border-radius: 99px; box-shadow: 0 8px 22px rgba(23,104,71,.25); font-size: 13px; }
    .reveal { opacity: 0; transform: translateY(18px); transition: opacity .65s ease, transform .65s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }
    @media (max-width: 980px) {
      .nav-links { display: none; position: absolute; top: 76px; left: 18px; right: 18px; padding: 12px; 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: 7px 0 0; }
      .menu-toggle { display: block; }
      .hero-grid, .intro-grid, .contact-grid { grid-template-columns: 1fr; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .workflow { grid-template-columns: repeat(2, 1fr); }
      .step { border-bottom: 1px solid var(--line); }
      .step:nth-child(2) { border-right: 0; }
      .article-list { grid-template-columns: repeat(3, 1fr); }
    }
    @media (max-width: 640px) {
      :root { --container: min(100% - 28px, 1180px); }
      section { padding: 60px 0; }
      .hero { padding: 66px 0 56px; }
      h1 { font-size: 39px; }
      .hero-copy { font-size: 16px; }
      .section-head { display: block; }
      .section-head p { margin-top: 12px; }
      .stats, .service-grid, .solution-grid, .price-grid, .reviews, .feature-list, .media-grid { grid-template-columns: 1fr; }
      .workflow { grid-template-columns: 1fr; }
      .step, .step:nth-child(2) { border-right: 0; }
      .article-list { grid-template-columns: 1fr 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .full { grid-column: auto; }
      .footer-grid { grid-template-columns: 1fr; gap: 22px; }
      .rating { display: block; }
      .rating .stars { display: block; margin-top: 8px; }
      .float-contact a { padding: 11px 13px; }
    }