:root{
    --orange:#EE6F14;
    --orange-dark:#D65F0C;
    --orange-light:#FDE9D8;
    --ink:#17140F;
    --ink-soft:#4A473F;
    --cream:#FBF4EC;
    --cream-deep:#F5E9DA;
    --card:#FFFFFF;
    --line:#E9DFD0;
    --radius:16px;
    --shadow:0 10px 30px rgba(23,20,15,0.07);
  }
  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    font-family:'Segoe UI', -apple-system, BlinkMacSystemFont, Helvetica, Arial, sans-serif;
    background:var(--cream);
    color:var(--ink);
    line-height:1.55;
    display:flex;
    flex-direction:column;
    min-height:100vh;
    min-height:100svh;
  }
  header{flex-shrink:0;}
  main{flex:1 0 auto;}
  footer{flex-shrink:0;}
  a{color:var(--orange-dark);text-decoration:none;}
  a:hover{text-decoration:underline;}
  img{max-width:100%;display:block;}
  .wrap{max-width:1180px;margin:0 auto;padding:0 28px;}

  header{position:sticky;top:0;z-index:50;background:rgba(251,244,236,0.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);}
  .headerbar{position:relative;display:flex;align-items:center;justify-content:space-between;padding:14px 28px;max-width:1180px;margin:0 auto;gap:10px;}
  .brand img{height:28px;width:auto;}
  nav{display:flex;gap:14px;flex-wrap:wrap;}
  nav a{font-size:13px;font-weight:600;color:var(--ink);white-space:nowrap;}
  nav a:hover{color:var(--orange-dark);text-decoration:none;}
  .cta-small{background:var(--ink);color:#fff !important;padding:9px 18px;border-radius:999px;font-size:13px;font-weight:700;}
  .cta-small:hover{background:var(--orange-dark);text-decoration:none;}
  .nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px;margin-left:auto;flex-direction:column;justify-content:center;gap:5px;}
  .nav-toggle span{display:block;width:22px;height:2px;background:var(--ink);border-radius:2px;transition:transform .2s ease, opacity .2s ease;}
  .nav-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg);}
  .nav-toggle.active span:nth-child(2){opacity:0;}
  .nav-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

  .hero{position:relative;overflow:hidden;padding:64px 0 40px;}
  .hero-grid{display:grid;grid-template-columns:1.05fr 0.95fr;gap:40px;align-items:center;}
  .eyebrow{display:inline-flex;align-items:center;gap:8px;background:var(--orange-light);color:var(--orange-dark);font-weight:700;font-size:12.5px;letter-spacing:.06em;text-transform:uppercase;padding:7px 14px;border-radius:999px;margin-bottom:18px;}
  h1{font-size:42px;line-height:1.12;margin:0 0 18px;letter-spacing:-0.01em;}
  h1 span{color:var(--orange);}
  .hero p.lead{font-size:17px;color:var(--ink-soft);max-width:520px;margin:0 0 26px;}
  .hero-actions{display:flex;gap:14px;flex-wrap:wrap;}
  .btn{display:inline-block;padding:13px 24px;border-radius:999px;font-weight:700;font-size:14.5px;}
  .btn-primary{background:var(--orange);color:#fff;}
  .btn-primary:hover{background:var(--orange-dark);text-decoration:none;}
  .btn-ghost{background:#fff;color:var(--ink);border:1px solid var(--line);}
  .btn-ghost:hover{border-color:var(--orange);text-decoration:none;}
  .hero-img{border-radius:20px;overflow:hidden;box-shadow:var(--shadow);}
  .stat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:44px;}
  .stat{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px 18px;text-align:center;}
  .stat .num{font-size:22px;font-weight:800;color:var(--orange-dark);}
  .stat .lbl{font-size:12.5px;color:var(--ink-soft);margin-top:2px;}

  section{padding:60px 0;}
  section.alt{background:var(--cream-deep);}
  .section-head{max-width:700px;margin:0 0 32px;}
  .kicker{color:var(--orange-dark);font-weight:800;font-size:12.5px;letter-spacing:.08em;text-transform:uppercase;margin-bottom:10px;display:block;}
  h2{font-size:28px;margin:0 0 10px;letter-spacing:-0.01em;}
  .section-head p{color:var(--ink-soft);font-size:15px;margin:0;}
  h3.sub{font-size:19px;margin:36px 0 14px;padding-top:20px;border-top:1px solid var(--line);}
  h3.sub:first-of-type{border-top:none;padding-top:0;margin-top:0;}
  .sub-note{color:var(--ink-soft);font-size:13.5px;margin:-8px 0 14px;}

  .topic{display:grid;grid-template-columns:0.95fr 1.05fr;gap:24px;align-items:start;margin-bottom:14px;}
  .topic.rev{grid-template-columns:1.05fr 0.95fr;}
  .topic.rev .figure{order:2;}
  .topic .text h4{margin:0 0 8px;font-size:16.5px;}
  .topic .text p{margin:0 0 10px;color:var(--ink-soft);font-size:14.5px;}
  .topic .text ul{margin:8px 0 10px;padding-left:18px;color:var(--ink-soft);font-size:14.5px;}
  .topic .text li{margin-bottom:6px;}
  .figure{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:10px;box-shadow:var(--shadow);}
  .figure img{border-radius:9px;}
  .figure .cap{font-size:12px;color:var(--ink-soft);text-align:center;padding:8px 6px 2px;}
  .figure.full{grid-column:1/-1;}

  .kb-link{display:inline-flex;align-items:center;gap:6px;margin-top:4px;font-weight:700;font-size:13.5px;}
  .kb-link:after{content:"→";transition:transform .15s;}
  .kb-link:hover:after{transform:translateX(3px);}
  .links-col{display:flex;flex-direction:column;gap:6px;margin-top:6px;}

  .video-card{display:flex;gap:16px;align-items:center;background:var(--ink);color:#fff;border-radius:var(--radius);padding:18px 20px;margin-top:6px;}
  .video-card .play{width:46px;height:46px;border-radius:50%;background:var(--orange);display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:16px;}
  .video-card .vt{font-weight:700;font-size:14.5px;}
  .video-card .vs{font-size:12.5px;color:#C9C3B6;margin-top:2px;}
  .video-card a{color:#fff;text-decoration:underline;}

  .single-cols-2{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:14px;}
  .card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);}
  .card h4{margin:0 0 8px;font-size:16px;}
  .card p{margin:0 0 8px;color:var(--ink-soft);font-size:14px;}
  .card ul{margin:8px 0 0;padding-left:18px;color:var(--ink-soft);font-size:14px;}
  .card li{margin-bottom:6px;}

  .tag{display:inline-block;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;background:var(--orange-light);color:var(--orange-dark);padding:4px 10px;border-radius:999px;margin-bottom:10px;}

  .flow{display:flex;flex-direction:column;gap:0;}
  .flow-step{display:flex;gap:18px;padding:20px 0;border-bottom:1px solid var(--line);}
  .flow-step:last-child{border-bottom:none;}
  .step-num{width:32px;height:32px;border-radius:50%;background:var(--ink);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:13px;flex-shrink:0;}
  .flow-step h4{margin:0 0 6px;font-size:16px;}
  .flow-step p{margin:0;color:var(--ink-soft);font-size:14px;}

  .escalation{position:relative;padding-left:26px;border-left:2px dashed var(--line);}
  .esc-item{position:relative;padding-bottom:30px;}
  .esc-item:last-child{padding-bottom:0;}
  .esc-dot{position:absolute;left:-37px;top:0;width:24px;height:24px;border-radius:50%;background:var(--orange);color:#fff;font-size:12px;font-weight:800;display:flex;align-items:center;justify-content:center;}
  .esc-item h4{margin:0 0 6px;font-size:16px;}
  .esc-item p{margin:0;color:var(--ink-soft);font-size:14px;max-width:580px;}
  .esc-badge{display:inline-block;font-size:11px;font-weight:800;text-transform:uppercase;letter-spacing:.04em;padding:3px 9px;border-radius:6px;margin-left:8px;vertical-align:middle;}
  .badge-dealer{background:#E7ECEA;color:#33453E;}
  .badge-3disc{background:var(--orange-light);color:var(--orange-dark);}

  .kb-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;}
  .kb-card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 18px;display:flex;align-items:flex-start;gap:12px;transition:border-color .15s, transform .15s;}
  .kb-card:hover{border-color:var(--orange);transform:translateY(-2px);}
  .kb-ico{width:36px;height:36px;border-radius:9px;background:var(--orange-light);color:var(--orange-dark);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;flex-shrink:0;}
  .kb-card .t{font-weight:700;font-size:14.5px;margin-bottom:3px;color:var(--ink);}
  .kb-card .u{font-size:12.5px;color:var(--ink-soft);word-break:break-word;}

  .contact-grid{display:grid;grid-template-columns:0.9fr 1.1fr;gap:32px;align-items:start;}
  .info-card{background:var(--ink);color:#fff;border-radius:var(--radius);padding:30px;}
  .info-card h3{margin:0 0 6px;font-size:20px;}
  .info-card p.sub{color:#D9D3C6;font-size:14px;margin:0 0 22px;}
  .info-row{display:flex;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid rgba(255,255,255,0.12);}
  .info-row:last-of-type{border-bottom:none;}
  .info-ico{width:36px;height:36px;border-radius:9px;background:rgba(238,111,20,0.18);color:var(--orange);display:flex;align-items:center;justify-content:center;flex-shrink:0;}
  .info-row .l{font-size:12px;color:#B9B2A2;text-transform:uppercase;letter-spacing:.05em;}
  .info-row .v{font-weight:700;font-size:14.5px;color:#fff;}
  .info-card .steps{margin-top:22px;padding-top:20px;border-top:1px solid rgba(255,255,255,0.12);}
  .info-card .steps li{color:#D9D3C6;font-size:13.5px;margin-bottom:8px;}

  form.contact-form{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);}
  .form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px;}
  .form-field{display:flex;flex-direction:column;gap:6px;}
  .form-field.full{grid-column:1/-1;}
  label{font-size:12.5px;font-weight:700;color:var(--ink-soft);text-transform:uppercase;letter-spacing:.03em;}
  input,select,textarea{border:1px solid var(--line);border-radius:9px;padding:11px 12px;font-size:14.5px;font-family:inherit;background:#FCFAF7;color:var(--ink);}
  input:focus,select:focus,textarea:focus{outline:2px solid var(--orange);border-color:var(--orange);}
  textarea{resize:vertical;min-height:110px;}
  .submit-row{display:flex;align-items:center;gap:14px;margin-top:6px;}
  .form-note{font-size:12.5px;color:var(--ink-soft);}

  footer{background:var(--ink);color:#C9C3B6;padding:34px 0;}
  .footer-grid{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;}
  .footer-grid .brand-f{color:#fff;font-weight:800;font-size:15px;}
  .footer-grid a{color:#C9C3B6;}
  .footer-grid a:hover{color:var(--orange);}

  @media (max-width:860px){
    .hero-grid{grid-template-columns:1fr;}
    .stat-row{grid-template-columns:repeat(2,1fr);}
    .topic, .topic.rev{grid-template-columns:1fr;}
    .topic.rev .figure{order:0;}
    .single-cols-2{grid-template-columns:1fr;}
    .kb-grid{grid-template-columns:1fr;}
    .contact-grid{grid-template-columns:1fr;}
    .form-row{grid-template-columns:1fr;}
    h1{font-size:32px;}
  }

  /* Nav collapses to the hamburger menu earlier than the content-layout
     breakpoint above: with 8 links plus the model badge / switch / contact
     button, the full nav no longer fits on one line below ~1180px and would
     otherwise wrap to a ragged two-line header instead of cleanly stacking. */
  @media (max-width:1180px){
    nav{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;gap:0;background:var(--cream);border-bottom:1px solid var(--line);box-shadow:0 14px 24px rgba(23,20,15,0.08);padding:6px 28px 14px;}
    nav.active{display:flex;}
    nav a{padding:13px 0;border-bottom:1px solid var(--line);}
    nav a:last-child{border-bottom:none;}
    .nav-toggle{display:flex;}
  }

  .zoomable{cursor:zoom-in;transition:opacity .15s;}
  .zoomable:hover{opacity:.92;}
  #lightbox-overlay{position:fixed;inset:0;background:rgba(15,14,12,0.92);display:none;align-items:center;justify-content:center;z-index:9999;padding:40px;cursor:zoom-out;}
  #lightbox-overlay.active{display:flex;}
  #lightbox-overlay img{max-width:90vw;max-height:88vh;border-radius:10px;box-shadow:0 20px 60px rgba(0,0,0,0.5);cursor:default;}
  #lightbox-close{position:absolute;top:20px;right:28px;width:42px;height:42px;border-radius:50%;background:rgba(255,255,255,0.12);color:#fff;font-size:24px;line-height:1;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s;}
  #lightbox-close:hover{background:rgba(255,255,255,0.22);}

  .brand{display:block;}
  nav a.active-link{color:var(--orange-dark);}
  #guide-contents .kb-grid{grid-template-columns:repeat(2,1fr);}
  @media (max-width:860px){
    #guide-contents .kb-grid{grid-template-columns:1fr;}
  }

  .brand-group{display:flex;align-items:center;gap:10px;}
  .model-badge{display:inline-flex;align-items:center;background:var(--ink);color:#fff;font-size:11px;font-weight:800;letter-spacing:.04em;padding:4px 10px;border-radius:999px;}
  .switch-model{font-size:12px;font-weight:700;color:var(--ink-soft);white-space:nowrap;}
  .switch-model:hover{color:var(--orange-dark);}
  @media (max-width:640px){
    .switch-model{display:none;}
  }

  .model-picker{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
  .model-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;box-shadow:var(--shadow);text-align:center;transition:border-color .15s, transform .15s;}
  .model-card:hover{border-color:var(--orange);transform:translateY(-3px);text-decoration:none;}
  .model-card .model-name{font-size:22px;font-weight:800;color:var(--ink);margin-bottom:8px;}
  .model-card .model-desc{font-size:13.5px;color:var(--ink-soft);margin-bottom:18px;}
  .model-card .model-cta{display:inline-block;padding:10px 22px;border-radius:999px;font-weight:700;font-size:13.5px;background:var(--orange-light);color:var(--orange-dark);}
  .model-card:hover .model-cta{background:var(--orange);color:#fff;}
  @media (max-width:860px){
    .model-picker{grid-template-columns:1fr;}
  }

  #model-prompt-overlay{position:fixed;inset:0;background:rgba(15,14,12,0.55);display:none;align-items:center;justify-content:center;z-index:9999;padding:20px;}
  #model-prompt-overlay.active{display:flex;}
  .model-prompt-card{background:#fff;border-radius:16px;padding:32px;max-width:420px;width:100%;text-align:center;box-shadow:0 20px 60px rgba(0,0,0,0.35);}
  .model-prompt-card h3{margin:0 0 8px;font-size:20px;color:var(--ink);}
  .model-prompt-card p{margin:0 0 22px;color:var(--ink-soft);font-size:14px;}
  .model-prompt-choices{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;}
  .model-prompt-choices button{border:none;cursor:pointer;padding:12px 22px;border-radius:999px;font-weight:700;font-size:14px;background:var(--orange-light);color:var(--orange-dark);transition:background .15s,color .15s;font-family:inherit;}
  .model-prompt-choices button:hover{background:var(--orange);color:#fff;}