:root{--ink:#20251e;--muted:#62685e;--paper:#fffdf7;--yellow:#ffd429;--yellow-deep:#efb900;--green:#1e624a;--line:#e8e5d9;--soft:#f5f3e9;--white:#fff}
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;background:var(--paper);color:var(--ink);font-family:Arial,"Noto Sans SC","Microsoft YaHei",sans-serif;line-height:1.65}
    a{color:inherit}
    button,input,select,textarea{font:inherit}
    img{max-width:100%;height:auto}
    .container{width:min(1160px,calc(100% - 40px));margin-inline:auto}
    .site-header{position:sticky;top:0;z-index:20;background:rgba(255,253,247,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}
    .nav-row{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:800;font-size:18px;white-space:nowrap}
    .ai-page-logo{width:38px;height:38px;object-fit:contain}
    .nav-links{display:flex;align-items:center;gap:0;list-style:none;padding:0;margin:0}
    .nav-links a{display:block;padding:10px 11px;color:#42483f;text-decoration:none;font-size:13px;white-space:nowrap}
    .nav-links a:hover,.nav-links a:focus-visible{color:var(--green)}
    .nav-actions{display:flex;align-items:center;gap:10px}
    .menu-toggle{display:none;border:1px solid var(--line);background:white;border-radius:6px;padding:8px 10px;color:var(--ink)}
    .button{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 19px;border:1px solid var(--ink);border-radius:5px;text-decoration:none;font-weight:700;color:var(--ink);background:white;transition:transform .2s,box-shadow .2s,background .2s}
    .button:hover{transform:translateY(-2px);box-shadow:0 7px 18px #25281820}
    .button-primary{background:var(--yellow);border-color:var(--yellow);color:#252313}
    .button-primary:hover{background:#ffdf57}
    .button-dark{background:var(--ink);color:white;border-color:var(--ink)}
    .hero{overflow:hidden;background:var(--yellow);position:relative}
    .hero::after{content:"";position:absolute;right:-80px;top:30px;width:340px;aspect-ratio:1;border:1px solid #302b1724;border-radius:50%;box-shadow:0 0 0 35px #302b1708,0 0 0 70px #302b1706;pointer-events:none}
    .hero-inner{position:relative;z-index:1;padding:82px 0 50px}
    .eyebrow{margin:0 0 16px;text-transform:uppercase;letter-spacing:1px;font-size:12px;font-weight:800;color:#4c481f}
    h1{max-width:760px;margin:0;font-size:clamp(42px,6vw,76px);line-height:1.08;letter-spacing:0;font-weight:850}
    .hero-copy{max-width:660px;margin:22px 0 28px;font-size:18px;color:#39371f}
    .hero-actions{display:flex;gap:12px;flex-wrap:wrap}
    .hero-note{margin:20px 0 0;font-size:13px;color:#4b4729}
    .hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid #4e471d55;margin-top:65px}
    .hero-stat{padding:19px 20px 4px 0}
    .hero-stat strong{display:block;font-size:17px}
    .hero-stat span{font-size:12px;color:#504b2b}
    .section{padding:76px 0}
    .section-tint{background:#f4f2e8}
    .section-green{background:var(--green);color:#fff}
    .section-head{max-width:700px;margin-bottom:34px}
    .section-head .eyebrow{color:var(--green)}
    .section-green .section-head .eyebrow{color:#ffe47c}
    h2{font-size:clamp(29px,4vw,44px);line-height:1.16;letter-spacing:0;margin:0 0 13px}
    .section-head p{margin:0;color:var(--muted)}
    .section-green .section-head p{color:#e0eee7}
    .intro-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:54px;align-items:start}
    .intro-copy p{color:var(--muted);margin:0 0 16px}
    .intro-points{display:grid;grid-template-columns:repeat(2,1fr);gap:16px 24px}
    .intro-point{border-top:2px solid var(--yellow-deep);padding-top:12px}
    .intro-point strong{display:block;margin-bottom:4px}
    .intro-point span{font-size:14px;color:var(--muted)}
    .service-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .service-item{background:#fff;border:1px solid var(--line);padding:22px;border-radius:4px;transition:transform .22s,border-color .22s,box-shadow .22s}
    .service-item:hover{transform:translateY(-4px);border-color:#d9b51e;box-shadow:0 10px 24px #26291b12}
    .service-item .index{font-size:12px;color:#8a781d;font-weight:800}
    .service-item h3{font-size:18px;margin:8px 0}
    .service-item p{margin:0;color:var(--muted);font-size:14px}
    .tag-list{display:flex;gap:9px;flex-wrap:wrap;margin-top:24px}
    .tag{border:1px solid #d5d2c5;background:#fff;padding:7px 11px;border-radius:3px;font-size:13px}
    .workflow{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step}
    .workflow article{border-top:1px solid #82a594;padding-top:18px}
    .workflow article::before{counter-increment:step;content:"0" counter(step);font-size:13px;color:#ffe47c;font-weight:800}
    .workflow h3{font-size:18px;margin:10px 0 7px}
    .workflow p{margin:0;color:#e0eee7;font-size:14px}
    .image-strip{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    .image-frame{margin:0;background:white;border:1px solid var(--line);padding:8px}
    .image-frame img{display:block;width:100%;aspect-ratio:16/9;object-fit:cover}
    .image-frame figcaption{padding:11px 8px 4px;font-size:14px;color:var(--muted)}
    .case-square{max-width:330px}
    .case-square img{aspect-ratio:1;object-fit:cover}
    .comparison-wrap{overflow-x:auto;border:1px solid var(--line);background:#fff}
    .comparison{width:100%;border-collapse:collapse;min-width:680px}
    .comparison th,.comparison td{text-align:left;padding:14px 16px;border-bottom:1px solid var(--line);vertical-align:top}
    .comparison thead{background:#f0eddf}
    .comparison th{font-size:13px}
    .comparison td{font-size:14px}
    .comparison tbody tr:last-child td{border-bottom:0}
    .rating{display:flex;align-items:center;gap:18px;margin-bottom:22px}
    .rating-score{font-size:36px;font-weight:850}
    .rating-stars{color:#ba8b00;font-size:20px;letter-spacing:0}
    .rating small{display:block;color:var(--muted)}
    .rating-disclaimer{font-size:12px;color:var(--muted);margin:13px 0 0}
    .form-layout{display:grid;grid-template-columns:.8fr 1.2fr;gap:46px;align-items:start}
    .form-aside p{color:var(--muted)}
    .contact-list{list-style:none;padding:0;margin:22px 0}
    .contact-list li{padding:7px 0;border-bottom:1px solid var(--line);font-size:14px}
    .contact-list a{color:var(--green)}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}
    .field{display:flex;flex-direction:column;gap:6px}
    .field-full{grid-column:1/-1}
    .field label{font-size:13px;font-weight:700}
    .field input,.field select,.field textarea{width:100%;padding:11px 12px;border:1px solid #d8d7cd;border-radius:4px;background:#fff;color:var(--ink)}
    .field textarea{min-height:118px;resize:vertical}
    .form-status{font-size:13px;color:var(--green);margin:12px 0 0}
    .reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .review{background:#fff;border-top:3px solid var(--yellow-deep);padding:20px}
    .review p{font-size:14px;margin:0 0 18px;color:#454a42}
    .review strong{font-size:13px}
    .review span{display:block;color:var(--muted);font-size:12px}
    .faq-list{max-width:850px}
    details{border-bottom:1px solid var(--line);padding:17px 0}
    summary{cursor:pointer;font-weight:700;list-style:none;display:flex;justify-content:space-between;gap:18px}
    summary::-webkit-details-marker{display:none}
    summary::after{content:"+";font-size:20px;color:var(--green);line-height:1}
    details[open] summary::after{content:"−"}
    details p{margin:11px 28px 0 0;color:var(--muted);font-size:14px}
    .article-links,.friend-links{display:flex;flex-wrap:wrap;gap:10px 18px}
    .article-links a,.friend-links a{color:var(--green);text-underline-offset:4px}
    .article-note{color:var(--muted);font-size:13px;margin-top:12px}
    .network-band{display:grid;grid-template-columns:1fr 1fr;gap:35px;align-items:center}
    .network-band p{color:var(--muted)}
    .network-facts{display:grid;grid-template-columns:1fr 1fr;gap:18px}
    .network-facts div{border-left:3px solid var(--yellow-deep);padding-left:13px}
    .network-facts strong{display:block}
    .network-facts span{font-size:13px;color:var(--muted)}
    .footer{background:#20251e;color:#f5f4ed;padding:30px 0}
    .footer-row{display:flex;justify-content:space-between;align-items:center;gap:18px}
    .footer p{margin:0;color:#d5d8d0;font-size:13px}
    .footer a{color:#ffe16b}
    .float-contact{position:fixed;right:18px;bottom:20px;z-index:15;display:grid;gap:8px}
    .float-contact a{display:block;padding:10px 13px;background:var(--ink);color:#fff;text-decoration:none;border-radius:4px;font-size:13px;box-shadow:0 4px 14px #0002}
    .float-contact a:first-child{background:var(--yellow);color:var(--ink)}
    .reveal{opacity:0;transform:translateY(14px);transition:opacity .55s ease,transform .55s ease}
    .reveal.is-visible{opacity:1;transform:none}
    @media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.reveal{opacity:1;transform:none;transition:none}*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
    @media(max-width:980px){
      .menu-toggle{display:block}
      .nav-links{display:none;position:absolute;left:20px;right:20px;top:70px;padding:10px;background:#fffdf7;border:1px solid var(--line);box-shadow:0 12px 25px #2222;align-items:stretch;flex-direction:column}
      .nav-links.is-open{display:flex}
      .nav-links a{padding:11px}
      .nav-actions>.button{display:none}
      .service-grid{grid-template-columns:repeat(2,1fr)}
    }
    @media(max-width:700px){
      .container{width:min(100% - 32px,1160px)}
      .hero-inner{padding:62px 0 35px}
      .hero-copy{font-size:16px}
      .hero-stats{grid-template-columns:repeat(2,1fr);margin-top:45px}
      .hero-stat{padding:15px 8px 4px 0}
      .section{padding:58px 0}
      .intro-grid,.form-layout,.network-band{grid-template-columns:1fr;gap:28px}
      .service-grid,.reviews{grid-template-columns:1fr}
      .workflow{grid-template-columns:repeat(2,1fr);gap:25px 16px}
      .intro-points{gap:16px}
      .image-strip{grid-template-columns:1fr}
      .case-square{max-width:none}
      .footer-row{align-items:flex-start;flex-direction:column}
      .float-contact{right:10px;bottom:10px}
      .float-contact a{font-size:12px;padding:9px 10px}
    }
    @media(max-width:430px){
      .brand{font-size:16px}
      .ai-page-logo{width:32px;height:32px}
      .hero-actions .button{width:100%}
      .form-grid{grid-template-columns:1fr}
      .field-full{grid-column:auto}
      .workflow{grid-template-columns:1fr}
    }