:root{
    --orange:#ff6a1a;
    --orange-deep:#f04e00;
    --orange-soft:#fff2ea;
    --ink:#231a14;
    --ink-2:#4a3d34;
    --ink-3:#7c6c60;
    --line:#f0e2d8;
    --bg:#fffaf6;
    --card:#ffffff;
    --radius:16px;
    --shadow:0 8px 28px rgba(180,90,30,.10);
    --shadow-hover:0 16px 40px rgba(180,90,30,.18);
    --container:1180px;
  }
  *{box-sizing:border-box;margin:0;padding:0;}
  html{scroll-behavior:smooth;}
  body{
    font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
    color:var(--ink);
    background:
      radial-gradient(1200px 600px at 85% -8%, #ffe6d6 0%, transparent 60%),
      radial-gradient(900px 500px at -5% 15%, #fff0e2 0%, transparent 55%),
      linear-gradient(180deg,#fffaf6 0%,#fff6ef 45%,#fffaf6 100%);
    background-attachment:fixed;
    line-height:1.7;
    -webkit-font-smoothing:antialiased;
  }
  .container{width:100%;max-width:var(--container);margin:0 auto;padding:0 22px;}
  a{color:inherit;text-decoration:none;}
  img{max-width:100%;height:auto;display:block;}
  h1,h2,h3{line-height:1.3;font-weight:800;letter-spacing:.2px;}
  h2{font-size:clamp(22px,3.4vw,32px);}
  h3{font-size:clamp(17px,2vw,19px);}
  section{padding:64px 0;position:relative;}
  .eyebrow{
    display:inline-flex;align-items:center;gap:8px;
    font-size:13px;font-weight:700;letter-spacing:1px;color:var(--orange-deep);
    background:var(--orange-soft);border:1px solid #ffd9c2;
    padding:5px 14px;border-radius:999px;margin-bottom:16px;
  }
  .eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--orange);}
  .sec-head{max-width:760px;margin-bottom:38px;}
  .sec-head p{color:var(--ink-3);margin-top:12px;font-size:15px;}
  .center{text-align:center;margin-left:auto;margin-right:auto;}

  /* NAV */
  header.site-header{position:sticky;top:0;z-index:120;background:rgba(255,250,246,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);}
  .nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:66px;}
  .brand{display:flex;align-items:center;gap:10px;flex-shrink:0;}
  .ai-page-logo{width:auto;max-height:38px;}
  .brand-name{font-weight:800;font-size:17px;letter-spacing:.5px;}
  .brand-name span{color:var(--orange-deep);}
  .nav-links{display:flex;align-items:center;gap:0;list-style:none;}
  .nav-links li a{display:block;padding:8px 11px;font-size:14px;color:var(--ink-2);font-weight:600;border-radius:8px;transition:.22s;}
  .nav-links li a:hover{color:var(--orange-deep);background:var(--orange-soft);}
  .nav-actions{display:flex;align-items:center;gap:10px;flex-shrink:0;}
  .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:700;border-radius:10px;cursor:pointer;transition:transform .2s,box-shadow .2s,background .2s;border:none;font-family:inherit;}
  .btn-primary{background:linear-gradient(135deg,#ff7a2e,#f04e00);color:#fff;padding:11px 22px;font-size:14px;box-shadow:0 8px 20px rgba(240,78,0,.28);}
  .btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(240,78,0,.36);}
  .btn-ghost{background:#fff;color:var(--orange-deep);border:1.5px solid #ffcbb0;padding:10px 20px;font-size:14px;}
  .btn-ghost:hover{background:var(--orange-soft);transform:translateY(-2px);}
  .menu-toggle{display:none;width:42px;height:42px;border-radius:10px;border:1px solid var(--line);background:#fff;cursor:pointer;flex-direction:column;align-items:center;justify-content:center;gap:5px;}
  .menu-toggle span{width:20px;height:2px;background:var(--ink);border-radius:2px;transition:.25s;}
  .menu-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
  .menu-toggle.open span:nth-child(2){opacity:0;}
  .menu-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

  /* HERO */
  .hero{padding:70px 0 64px;overflow:hidden;}
  .hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;}
  .hero h1{font-size:clamp(28px,4.6vw,46px);line-height:1.22;letter-spacing:.5px;}
  .hero h1 em{font-style:normal;color:var(--orange-deep);position:relative;}
  .hero h1 em::after{content:"";position:absolute;left:0;right:0;bottom:4px;height:10px;background:rgba(255,106,26,.18);border-radius:4px;z-index:-1;}
  .hero .lead{color:var(--ink-2);font-size:16px;margin-top:20px;max-width:540px;}
  .hero-tags{display:flex;flex-wrap:wrap;gap:9px;margin-top:22px;}
  .tag{font-size:13px;font-weight:600;color:var(--ink-2);background:#fff;border:1px solid var(--line);padding:6px 14px;border-radius:999px;transition:.22s;}
  .tag:hover{border-color:#ffcbb0;color:var(--orange-deep);transform:translateY(-2px);box-shadow:0 6px 16px rgba(240,78,0,.10);}
  .hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px;}
  .hero-cta .btn{padding:14px 30px;font-size:15px;border-radius:12px;}
  .hero-visual{position:relative;display:grid;gap:16px;}
  .stat-panel{background:linear-gradient(150deg,#fff,#fff4ec);border:1px solid var(--line);border-radius:20px;padding:26px;box-shadow:var(--shadow);}
  .stat-panel h3{font-size:15px;color:var(--ink-3);font-weight:700;margin-bottom:18px;letter-spacing:.5px;}
  .stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;}
  .stat-item{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px;transition:.25s;}
  .stat-item:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#ffd9c2;}
  .stat-item .num{font-size:26px;font-weight:900;color:var(--orange-deep);line-height:1.1;}
  .stat-item .lbl{font-size:12.5px;color:var(--ink-3);margin-top:6px;font-weight:600;}
  .orbit{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;background:#fff;border:1px solid var(--line);border-radius:20px;padding:18px;box-shadow:var(--shadow);}
  .orbit .chip{font-size:12.5px;font-weight:700;color:var(--ink-2);background:var(--orange-soft);border-radius:999px;padding:6px 13px;animation:pulseChip 3.2s ease-in-out infinite;}
  .orbit .chip:nth-child(2n){animation-delay:.5s;background:#fff3ec;}
  .orbit .chip:nth-child(3n){animation-delay:1s;background:#ffeade;}
  @keyframes pulseChip{0%,100%{transform:translateY(0)}50%{transform:translateY(-3px)}}

  /* MARQUEE / PLATFORM */
  .platform-bar{background:linear-gradient(135deg,#2a1a10,#4a2a15);border-radius:22px;padding:28px 30px;color:#fff;display:flex;flex-wrap:wrap;align-items:center;gap:20px;justify-content:space-between;box-shadow:0 20px 44px rgba(60,25,5,.22);}
  .platform-bar h3{font-size:17px;color:#fff;}
  .platform-bar p{font-size:13.5px;color:#ffd8c0;margin-top:4px;}
  .platform-bar .btn-primary{background:#fff;color:var(--orange-deep);box-shadow:none;}
  .platform-bar .btn-primary:hover{background:#fff2ea;}

  /* CARDS */
  .card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
  .svc-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:transform .25s,box-shadow .25s,border-color .25s;position:relative;overflow:hidden;}
  .svc-card::before{content:"";position:absolute;inset:0 0 auto 0;height:3px;background:linear-gradient(90deg,var(--orange),#ffb27a);transform:scaleX(0);transform-origin:left;transition:transform .3s;}
  .svc-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover);border-color:#ffd0b4;}
  .svc-card:hover::before{transform:scaleX(1);}
  .svc-icon{width:46px;height:46px;border-radius:12px;background:linear-gradient(135deg,#fff0e3,#ffe0cc);display:flex;align-items:center;justify-content:center;font-size:21px;margin-bottom:16px;}
  .svc-card h3{margin-bottom:9px;}
  .svc-card p{font-size:14px;color:var(--ink-3);}

  /* FLOW */
  .flow{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step;}
  .flow-step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;position:relative;transition:.25s;}
  .flow-step:hover{box-shadow:var(--shadow);transform:translateY(-4px);}
  .flow-step .idx{font-size:13px;font-weight:800;color:#fff;background:linear-gradient(135deg,#ff7a2e,#f04e00);width:32px;height:32px;border-radius:9px;display:flex;align-items:center;justify-content:center;margin-bottom:14px;}
  .flow-step h3{font-size:16px;margin-bottom:6px;}
  .flow-step p{font-size:13.5px;color:var(--ink-3);}

  /* TABLE */
  .table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--line);background:#fff;box-shadow:var(--shadow);}
  table{width:100%;border-collapse:collapse;min-width:720px;font-size:14px;}
  thead th{background:linear-gradient(135deg,#2a1a10,#4a2a15);color:#fff;font-weight:700;padding:15px 18px;text-align:left;white-space:nowrap;}
  tbody td{padding:14px 18px;border-bottom:1px solid var(--line);color:var(--ink-2);}
  tbody tr:last-child td{border-bottom:none;}
  tbody tr:hover{background:#fff7f1;}
  .rate-badge{display:inline-flex;gap:4px;color:var(--orange-deep);font-weight:800;font-size:14px;}
  .score-big{display:inline-flex;align-items:baseline;gap:4px;font-weight:900;color:var(--orange-deep);}
  .score-big b{font-size:30px;line-height:1;}

  /* REVIEWS */
  .review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
  .review-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:.25s;}
  .review-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px);border-color:#ffd0b4;}
  .review-stars{color:#ff8a2e;font-size:14px;letter-spacing:2px;margin-bottom:12px;}
  .review-card p{font-size:14px;color:var(--ink-2);}
  .review-user{display:flex;align-items:center;gap:11px;margin-top:18px;padding-top:16px;border-top:1px dashed var(--line);}
  .avatar{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,#ff9a5c,#f04e00);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;flex-shrink:0;}
  .review-user strong{display:block;font-size:14px;}
  .review-user span{font-size:12.5px;color:var(--ink-3);}

  /* CASE */
  .case-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:22px;}
  .case-box{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.25s;}
  .case-box:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px);}
  .case-img{background:#fff7f1;}
  .case-img img{width:100%;height:auto;object-fit:contain;}
  .case-body{padding:18px 20px;}
  .case-body h3{font-size:16px;margin-bottom:6px;}
  .case-body p{font-size:13.5px;color:var(--ink-3);}
  .case-small{display:grid;gap:22px;}
  .lang-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.25s;}
  .lang-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px);}
  .lang-card .cap{padding:14px 18px;font-size:14px;font-weight:700;color:var(--ink-2);}

  /* PRICE */
  .price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
  .price-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:.25s;}
  .price-card.feature{border:2px solid var(--orange);box-shadow:0 16px 36px rgba(240,78,0,.16);position:relative;}
  .price-card.feature::after{content:"推荐";position:absolute;top:16px;right:16px;background:var(--orange);color:#fff;font-size:12px;font-weight:700;padding:3px 11px;border-radius:999px;}
  .price-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);}
  .price-card h3{font-size:16px;color:var(--ink-2);}
  .price-val{font-size:30px;font-weight:900;color:var(--orange-deep);margin:12px 0 4px;}
  .price-val small{font-size:13px;color:var(--ink-3);font-weight:600;}
  .price-card ul{list-style:none;margin-top:16px;display:grid;gap:9px;}
  .price-card li{font-size:13.5px;color:var(--ink-2);padding-left:20px;position:relative;}
  .price-card li::before{content:"✓";position:absolute;left:0;color:var(--orange-deep);font-weight:800;}

  /* FAQ */
  .faq-list{display:grid;gap:12px;max-width:900px;margin:0 auto;}
  .faq-item{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:.22s;}
  .faq-item.open{border-color:#ffcbb0;box-shadow:var(--shadow);}
  .faq-q{width:100%;text-align:left;background:none;border:none;padding:18px 22px;font-size:15px;font-weight:700;color:var(--ink);cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:14px;font-family:inherit;}
  .faq-q .icon{width:24px;height:24px;border-radius:50%;background:var(--orange-soft);color:var(--orange-deep);display:flex;align-items:center;justify-content:center;font-size:15px;flex-shrink:0;transition:.3s;}
  .faq-item.open .icon{transform:rotate(45deg);background:var(--orange);color:#fff;}
  .faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease,padding .35s ease;padding:0 22px;color:var(--ink-3);font-size:14px;}
  .faq-item.open .faq-a{max-height:240px;padding:0 22px 18px;}

  /* ARTICLES */
  .article-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;}
  .article-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px;transition:.25s;}
  .article-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#ffd0b4;}
  .article-card h3{font-size:14px;margin-bottom:8px;color:var(--ink);}
  .article-card p{font-size:12.5px;color:var(--ink-3);}
  .article-card .more{font-size:12.5px;color:var(--orange-deep);font-weight:700;margin-top:10px;display:inline-block;}

  /* FORM */
  .form-section{background:linear-gradient(150deg,#fff,#fff3ea);border:1px solid var(--line);border-radius:24px;padding:40px;box-shadow:var(--shadow);}
  .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:start;}
  .form-info h2{font-size:clamp(22px,3vw,30px);}
  .form-info p{color:var(--ink-3);font-size:14.5px;margin-top:14px;}
  .form-info .contact-list{list-style:none;margin-top:24px;display:grid;gap:12px;}
  .form-info .contact-list li{font-size:14px;color:var(--ink-2);display:flex;gap:10px;align-items:flex-start;}
  .form-info .contact-list li b{color:var(--ink);}
  .contact-badge{color:var(--orange-deep);font-weight:700;}
  form{display:grid;gap:16px;}
  .field label{display:block;font-size:13.5px;font-weight:700;margin-bottom:6px;color:var(--ink-2);}
  .field input,.field select,.field textarea{
    width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;
    font-size:14px;font-family:inherit;background:#fff;color:var(--ink);transition:.2s;
  }
  .field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--orange);box-shadow:0 0 0 3px rgba(255,106,26,.12);}
  .field textarea{resize:vertical;min-height:110px;}
  .form-row2{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
  form .btn-primary{width:100%;padding:14px;font-size:15px;border-radius:10px;}

  /* FOOTER */
  footer{background:linear-gradient(150deg,#251710,#3a2214);color:#e8d8cc;padding:56px 0 0;margin-top:20px;}
  .footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.1fr;gap:36px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.10);}
  footer h3{font-size:15px;color:#fff;margin-bottom:16px;font-weight:700;}
  footer p{font-size:13.5px;color:#c9b3a3;line-height:1.8;}
  footer ul{list-style:none;display:grid;gap:10px;}
  footer ul li a{font-size:13.5px;color:#c9b3a3;transition:.2s;}
  footer ul li a:hover{color:#ff9a5c;}
  .footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px;}
  .footer-brand .ai-page-logo{max-height:34px;}
  .footer-brand span{color:#fff;font-weight:800;font-size:16px;}
  .qrcode-box{display:flex;gap:14px;align-items:flex-start;margin-top:16px;}
  .qrcode-box img{width:96px;height:96px;object-fit:cover;border-radius:10px;border:2px solid rgba(255,255,255,.12);background:#fff;}
  .qrcode-box small{font-size:12.5px;color:#c9b3a3;display:block;line-height:1.7;}
  .friend-links{padding:22px 0;border-bottom:1px solid rgba(255,255,255,.10);display:flex;flex-wrap:wrap;gap:8px 18px;align-items:center;}
  .friend-links span{font-size:13px;color:#a8917f;font-weight:700;}
  .friend-links a{font-size:13px;color:#c9b3a3;transition:.2s;}
  .friend-links a:hover{color:#ff9a5c;}
  .copyright{padding:20px 0 26px;text-align:center;font-size:12.5px;color:#a8917f;}

  /* FLOATING */
  .float-bar{position:fixed;right:18px;bottom:26px;z-index:200;display:grid;gap:10px;}
  .float-btn{width:50px;height:50px;border-radius:14px;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;background:#fff;color:var(--orange-deep);box-shadow:0 8px 20px rgba(120,60,20,.22);font-size:19px;transition:.22s;font-family:inherit;}
  .float-btn:hover{background:var(--orange);color:#fff;transform:translateY(-3px);}
  .float-btn.back-top{opacity:0;pointer-events:none;}
  .float-btn.back-top.show{opacity:1;pointer-events:auto;}
  .float-btn svg{width:22px;height:22px;}

  .reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease;}
  .reveal.in{opacity:1;transform:none;}

  .divider-line{height:1px;background:linear-gradient(90deg,transparent,var(--line),transparent);margin:0 auto;max-width:var(--container);}

  /* responsive */
  @media(max-width:1024px){
    .hero-grid{grid-template-columns:1fr;gap:36px;}
    .card-grid,.review-grid,.price-grid{grid-template-columns:repeat(2,1fr);}
    .flow{grid-template-columns:repeat(2,1fr);}
    .article-grid{grid-template-columns:repeat(3,1fr);}
    .case-grid{grid-template-columns:1fr;}
    .form-grid{grid-template-columns:1fr;gap:32px;}
    .footer-grid{grid-template-columns:1fr 1fr;gap:28px;}
    .nav-links{display:none;position:absolute;top:66px;left:0;right:0;background:#fffaf6;border-bottom:1px solid var(--line);flex-direction:column;gap:2px;padding:12px 22px;align-items:stretch;box-shadow:0 16px 30px rgba(120,60,20,.10);}
    .nav-links.open{display:flex;}
    .nav-links li a{padding:12px 14px;}
    .menu-toggle{display:flex;}
  }
  @media(max-width:720px){
    section{padding:48px 0;}
    .hero{padding:44px 0 40px;}
    .card-grid,.review-grid,.price-grid{grid-template-columns:1fr;}
    .flow{grid-template-columns:1fr;}
    .article-grid{grid-template-columns:1fr 1fr;}
    .stat-grid{grid-template-columns:1fr 1fr;}
    .form-section{padding:26px 20px;}
    .form-row2{grid-template-columns:1fr;}
    .footer-grid{grid-template-columns:1fr;gap:26px;}
    .platform-bar{padding:22px;}
    .hero-cta .btn{flex:1 1 100%;}
    .nav-actions .btn-ghost{display:none;}
  }
  @media(max-width:420px){
    .article-grid{grid-template-columns:1fr;}
    .stat-grid{grid-template-columns:1fr;}
  }