:root{
    --ink:#0b1b2e; --ink-2:#22344b; --paper:#ffffff; --soft:#f4f7fb; --line:#dde5ef;
    --accent:#1f5eff; --accent-2:#0ea5a5; --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
    --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  }
  *{box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{margin:0;font-family:var(--sans);color:var(--ink);background:var(--paper);line-height:1.6;-webkit-font-smoothing:antialiased}
  a{color:var(--accent);text-decoration:none}
  a:hover{text-decoration:underline}
  .wrap{max-width:1080px;margin:0 auto;padding:0 24px}

  /* nav */
  .nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
  .nav .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
  .logo{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:.02em;color:var(--ink);font-size:1.05rem}
  .logo svg{display:block}
  .nav nav{display:flex;gap:22px;font-size:.9rem}
  .nav nav a{color:var(--ink-2)}
  @media(max-width:760px){.nav nav{display:none}}

  /* hero */
  .hero{background:
      radial-gradient(1200px 500px at 80% -10%, rgba(31,94,255,.25), transparent 60%),
      radial-gradient(900px 420px at 10% 110%, rgba(14,165,165,.18), transparent 55%),
      var(--ink);
    color:#eaf1fb;padding:96px 0 84px}
  .hero .eyebrow{font-family:var(--mono);font-size:.72rem;letter-spacing:.22em;text-transform:uppercase;color:#7fa7ff;margin-bottom:18px}
  .hero h1{font-size:clamp(1.9rem,4.4vw,3.3rem);line-height:1.12;letter-spacing:-.02em;margin:0 0 20px;max-width:820px}
  .hero p.lede{font-size:1.13rem;max-width:760px;color:#b9c8de;margin:0 0 30px}
  .hero .ctas{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:44px}
  .btn{display:inline-block;padding:12px 22px;border-radius:8px;font-weight:600;font-size:.95rem}
  .btn-primary{background:var(--accent);color:#fff}
  .btn-primary:hover{background:#1a4fd6;text-decoration:none}
  .btn-ghost{border:1px solid rgba(234,241,251,.35);color:#eaf1fb}
  .btn-ghost:hover{border-color:#eaf1fb;text-decoration:none}
  .facts{display:flex;gap:34px;flex-wrap:wrap;border-top:1px solid rgba(234,241,251,.16);padding-top:22px}
  .facts div{font-family:var(--mono);font-size:.78rem;color:#8fa5c4}
  .facts b{display:block;color:#eaf1fb;font-size:.95rem;font-weight:600;margin-bottom:2px}

  /* sections */
  section.block{padding:78px 0}
  section.block.alt{background:var(--soft)}
  .eyebrow{font-family:var(--mono);font-size:.72rem;letter-spacing:.22em;text-transform:uppercase;color:var(--accent);margin-bottom:12px}
  h2{font-size:clamp(1.5rem,2.8vw,2.1rem);letter-spacing:-.015em;margin:0 0 14px;line-height:1.2}
  p.lede{font-size:1.08rem;color:var(--ink-2);max-width:820px;margin:0 0 34px}

  .grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
  .grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
  @media(max-width:860px){.grid3,.grid2{grid-template-columns:1fr}}
  .card{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:24px}
  .card h3{margin:0 0 8px;font-size:1.02rem}
  .card p{margin:0;color:var(--ink-2);font-size:.94rem}
  .card .tag{font-family:var(--mono);font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent-2);display:block;margin-bottom:8px}

  pre{background:#0b1b2e;color:#d7e3f4;border-radius:12px;padding:22px;overflow-x:auto;font-family:var(--mono);font-size:.8rem;line-height:1.55}
  pre .c{color:#5f7796}
  code.inline{font-family:var(--mono);font-size:.86em;background:var(--soft);border:1px solid var(--line);border-radius:5px;padding:1px 6px}

  .tablewrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px;background:var(--paper)}
  table{border-collapse:collapse;width:100%;font-size:.9rem;min-width:760px}
  th,td{text-align:left;padding:14px 16px;border-bottom:1px solid var(--line);vertical-align:top}
  th{font-family:var(--mono);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-2);background:var(--soft)}
  tr:last-child td{border-bottom:none}
  td b{color:var(--ink)}

  .steps{counter-reset:step;display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
  @media(max-width:860px){.steps{grid-template-columns:1fr}}
  .step{background:var(--paper);border:1px solid var(--line);border-top:3px solid var(--accent);border-radius:0 0 12px 12px;padding:22px}
  .step::before{counter-increment:step;content:counter(step,decimal-leading-zero);font-family:var(--mono);color:var(--accent);font-size:.8rem;display:block;margin-bottom:10px}
  .step h3{margin:0 0 8px;font-size:1rem}
  .step p{margin:0;font-size:.92rem;color:var(--ink-2)}

  details{border:1px solid var(--line);border-radius:10px;background:var(--paper);margin-bottom:10px}
  summary{cursor:pointer;padding:16px 18px;font-weight:600;font-size:.98rem;list-style:none;display:flex;justify-content:space-between;align-items:center}
  summary::after{content:"+";font-family:var(--mono);color:var(--accent);font-size:1.1rem}
  details[open] summary::after{content:"–"}
  details .a{padding:0 18px 16px;color:var(--ink-2);font-size:.93rem}

  .contact-band{background:var(--ink);color:#eaf1fb;padding:70px 0}
  .contact-band h2{color:#fff}
  .contact-band p{color:#b9c8de;max-width:700px}
  .contact-band a.mail{font-family:var(--mono);color:#7fa7ff;font-size:1.05rem}

  footer{padding:40px 0;color:var(--ink-2);font-size:.8rem}
  footer .legal{border-top:1px solid var(--line);padding-top:18px;margin-top:18px;line-height:1.7;color:#67788f}
  /* subpage + guides additions */
  .crumb{font-family:var(--mono);font-size:.72rem;color:#67788f;padding:14px 0;border-bottom:1px solid var(--line);background:var(--soft)}
  .crumb a{color:var(--ink-2)}
  .pagehead{background:linear-gradient(180deg,var(--soft),var(--paper));padding:60px 0 42px;border-bottom:1px solid var(--line)}
  .pagehead h1{font-size:clamp(1.7rem,3.6vw,2.5rem);letter-spacing:-.02em;line-height:1.15;margin:0 0 14px;max-width:880px}
  .pagehead p.lede{font-size:1.06rem;color:var(--ink-2);max-width:800px;margin:0}
  .pagehead .meta{font-family:var(--mono);font-size:.72rem;color:#67788f;margin-top:18px}
  .prose h2{font-size:1.42rem;margin:46px 0 12px}
  .prose h3{font-size:1.05rem;margin:28px 0 8px;color:var(--ink)}
  .prose p{color:var(--ink-2);max-width:820px}
  .prose ul,.prose ol{color:var(--ink-2);max-width:820px;padding-left:22px}
  .prose li{margin:6px 0}
  .prose pre{margin:18px 0}
  ol.steps-num{counter-reset:n;list-style:none;padding:0;max-width:820px}
  ol.steps-num>li{counter-increment:n;position:relative;padding:0 0 28px 52px;border-left:2px solid var(--line);margin-left:14px}
  ol.steps-num>li:last-child{border-left-color:transparent;padding-bottom:4px}
  ol.steps-num>li::before{content:counter(n,decimal-leading-zero);position:absolute;left:-17px;top:-2px;font-family:var(--mono);font-size:.72rem;background:var(--accent);color:#fff;border-radius:20px;padding:5px 9px}
  ol.steps-num h3{margin:2px 0 6px;font-size:1.02rem}
  ol.steps-num p{margin:0;font-size:.93rem}
  .guide-card{display:block;color:inherit;border:1px solid var(--line);border-radius:12px;padding:22px;background:var(--paper);transition:border-color .15s,box-shadow .15s}
  .guide-card:hover{text-decoration:none;border-color:var(--accent);box-shadow:0 4px 18px rgba(31,94,255,.08)}
  .guide-card .tag{font-family:var(--mono);font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent-2);display:block;margin-bottom:8px}
  .guide-card h3{margin:0 0 8px;font-size:1rem}
  .guide-card p{margin:0;font-size:.9rem;color:var(--ink-2)}
  .related{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
  @media(max-width:860px){.related{grid-template-columns:1fr}}
  .footer-links{margin-top:12px;font-size:.82rem}
  .footer-links a{color:var(--ink-2);margin-right:4px}