/* TunnelNet front door + Business look (2026-11-09, #3443/#3445).
   Layout idea: one dark steel world; orange = Home, cyan = Business; pipes carry the eye left to right. */
:root {
  --bg: #0a1019;
  --panel: #111a27;
  --steel: #24344a;
  --text: #e7edf5;
  --muted: #8b9bb0;
  --home: #f3a43b;
  --biz: #4fd0e8;
  --display: 'Big Shoulders Display', 'Arial Narrow', Impact, sans-serif;
  --body: 'IBM Plex Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;
  color-scheme: dark;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body { background: var(--bg); color: var(--text); font-family: var(--body); font-size: 17px; line-height: 1.6; overflow-x: hidden; -webkit-font-smoothing: antialiased; }
a { color: var(--biz); }
a:hover { color: var(--text); }
:focus-visible { outline: 2px solid var(--text); outline-offset: 3px; border-radius: 4px; }
img { max-width: 100%; }
.wrap { max-width: 1180px; margin: 0 auto; padding-inline: 24px; }
.mono { font-family: var(--mono); }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 16px; background: var(--panel); color: var(--text); padding: 8px 12px; z-index: 10; }

/* header */
.site-head { border-bottom: 1px solid var(--steel); }
.site-head .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding-block: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-family: var(--display); font-weight: 800; font-size: 26px; letter-spacing: .06em; }
.brand-mark { width: 26px; height: 26px; flex: none; }
.site-nav { display: flex; gap: 4px 22px; flex-wrap: wrap; font-family: var(--mono); font-size: 14px; }
.site-nav a { color: var(--muted); text-decoration: none; padding: 4px 0; border-bottom: 2px solid transparent; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--text); }
.site-nav a.n-home:hover, .site-nav a.n-home[aria-current="page"] { border-color: var(--home); }
.site-nav a.n-biz:hover, .site-nav a.n-biz[aria-current="page"] { border-color: var(--biz); }

/* type */
h1, h2, h3, .display { font-family: var(--display); font-weight: 800; text-transform: uppercase; letter-spacing: .01em; line-height: 1.02; text-wrap: balance; }
h1 { font-size: clamp(40px, 6.4vw, 78px); }
h2 { font-size: clamp(30px, 4vw, 44px); }
h3 { font-size: 24px; letter-spacing: .03em; }
.hl-home { color: var(--home); }
.hl-biz { color: var(--biz); }
.lede { color: var(--muted); font-size: clamp(17px, 1.6vw, 20px); max-width: 62ch; }
.eyebrow { font-family: var(--mono); font-size: 13px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }

/* hero */
.hero { padding-block: 56px 8px; display: grid; gap: 18px; }

/* flow */
.flow { position: relative; padding-block: 28px 40px; }
.flow canvas { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.flow-grid { position: relative; display: grid; grid-template-columns: minmax(150px, 1fr) minmax(220px, 1.1fr) minmax(280px, 1.5fr); align-items: center; gap: 48px; }
.chips { display: grid; gap: 14px; justify-items: start; list-style: none; }
.chip { font-family: var(--mono); font-size: 13px; background: var(--panel); border: 1px solid var(--steel); border-radius: 999px; padding: 7px 14px; white-space: nowrap; color: var(--text); }
.chip b { font-weight: 500; color: var(--muted); margin-left: 6px; }
.core-cell { display: flex; justify-content: center; }
.core { position: relative; width: clamp(190px, 19vw, 240px); aspect-ratio: 1; border-radius: 50%; background: radial-gradient(circle at 50% 45%, #16233a 0%, var(--panel) 62%); border: 1px solid var(--steel); display: grid; place-items: center; text-align: center; box-shadow: 0 0 calc(var(--glow, 0) * 60px) calc(var(--glow, 0) * 6px) rgba(79, 208, 232, .22); transition: box-shadow .25s; }
.core-ring { position: absolute; inset: 12%; border-radius: 50%; border: 1.5px dashed #3a5170; animation: spin 40s linear infinite; }
.core-text { position: relative; display: grid; gap: 4px; }
.core-text .display { font-size: 28px; letter-spacing: .06em; }
.core-text .mono { font-size: 13px; color: var(--muted); }
@keyframes spin { to { transform: rotate(360deg); } }
.cards { display: grid; gap: 22px; }
.card { display: grid; gap: 8px; background: var(--panel); border: 1px solid var(--steel); border-left: 4px solid var(--c); border-radius: 10px; padding: 22px 24px; color: var(--text); text-decoration: none; transition: border-color .2s, transform .2s; }
.card:hover, .card:focus-visible { border-color: var(--c); transform: translateX(3px); }
.card.home { --c: var(--home); }
.card.biz { --c: var(--biz); }
.card .for { font-size: 14px; color: var(--muted); }
.card .name { font-family: var(--display); font-weight: 800; font-size: 34px; letter-spacing: .04em; color: var(--c); line-height: 1; }
.card p { font-size: 16px; }
.card .row { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-top: 6px; }
.card .price { font-family: var(--mono); font-size: 15px; }
.card .go { font-family: var(--mono); font-size: 14px; color: var(--c); }

/* numbers */
.numbers { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--steel); border-radius: 10px; background: var(--panel); margin-block: 24px 64px; }
.numbers > div { padding: 22px 22px 20px; border-left: 1px solid var(--steel); display: grid; gap: 6px; align-content: start; }
.numbers > div:first-child { border-left: 0; }
.numbers .big { font-family: var(--display); font-weight: 800; font-size: 40px; line-height: 1; font-variant-numeric: tabular-nums; }
.numbers .lbl { font-size: 15px; }
.numbers .note { font-family: var(--mono); font-size: 12px; color: var(--muted); }

.note-line { color: var(--muted); font-size: 14px; margin: -48px 0 64px; max-width: 80ch; }
.section .note-line { margin: 16px 0 0; }

/* HQ + reading */
.split { display: grid; grid-template-columns: 1.3fr 1fr; gap: 40px; padding-block: 8px 72px; align-items: start; }
.split p { max-width: 60ch; margin-top: 12px; }
.callout { background: var(--panel); border: 1px dashed var(--steel); border-radius: 10px; padding: 18px 20px; color: var(--muted); font-size: 15px; margin-top: 18px; }
.reading { display: grid; gap: 12px; }
.reading a { display: grid; gap: 2px; background: var(--panel); border: 1px solid var(--steel); border-radius: 8px; padding: 14px 16px; text-decoration: none; color: var(--text); }
.reading a:hover, .reading a:focus-visible { border-color: var(--biz); }
.reading .kind { font-family: var(--mono); font-size: 12px; color: var(--biz); text-transform: uppercase; letter-spacing: .08em; }
.reading .soon { display: grid; gap: 2px; border: 1px dashed var(--steel); border-radius: 8px; padding: 14px 16px; color: var(--muted); }

/* footer */
.site-foot { border-top: 1px solid var(--steel); padding-block: 28px 40px; color: var(--muted); font-size: 14px; }
.site-foot .wrap { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }
.site-foot a { color: var(--muted); }

/* inner pages (business, papers, blog) */
.page { padding-block: 48px 72px; display: grid; gap: 56px; }
.section { display: grid; gap: 16px; }
.section > p, .section li { max-width: 68ch; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.grid2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.box { background: var(--panel); border: 1px solid var(--steel); border-radius: 10px; padding: 20px 22px; display: grid; gap: 8px; align-content: start; }
.box h3 { font-size: 22px; }
.box p { color: var(--muted); font-size: 16px; }
.box.biz { border-left: 4px solid var(--biz); }
.tag { display: inline-block; font-family: var(--mono); font-size: 12px; padding: 2px 8px; border-radius: 999px; border: 1px solid var(--steel); color: var(--muted); vertical-align: middle; margin-left: 8px; text-transform: none; letter-spacing: 0; }
.tag.ok { color: var(--biz); border-color: var(--biz); }
.btn { display: inline-block; font-family: var(--mono); font-size: 15px; font-weight: 500; background: var(--biz); color: #06121a; text-decoration: none; padding: 12px 20px; border-radius: 8px; }
.btn:hover { background: var(--text); color: #06121a; }
.btn.ghost { background: transparent; color: var(--biz); border: 1px solid var(--biz); }
ol.steps { display: grid; gap: 10px; padding-left: 1.4em; max-width: 68ch; }
.price-box { display: grid; gap: 10px; max-width: 520px; }
.price-box .amt { font-family: var(--display); font-weight: 800; font-size: 56px; color: var(--biz); line-height: 1; }
.price-box ul { padding-left: 1.2em; display: grid; gap: 4px; }

/* articles */
article.doc { max-width: 760px; display: grid; gap: 18px; }
article.doc h1 { font-size: clamp(36px, 5vw, 56px); }
article.doc h2 { font-size: 30px; margin-top: 18px; }
article.doc h3 { font-size: 22px; margin-top: 8px; }
article.doc ul, article.doc ol { padding-left: 1.3em; display: grid; gap: 6px; }
article.doc pre { background: var(--panel); border: 1px solid var(--steel); border-radius: 8px; padding: 14px 16px; overflow-x: auto; font-family: var(--mono); font-size: 14px; line-height: 1.5; }
article.doc code { font-family: var(--mono); font-size: .92em; }
article.doc .tbl { overflow-x: auto; }
article.doc table { border-collapse: collapse; width: 100%; font-size: 15px; font-variant-numeric: tabular-nums; }
article.doc th, article.doc td { border-bottom: 1px solid var(--steel); padding: 8px 10px; text-align: left; vertical-align: top; }
article.doc th { font-family: var(--mono); font-size: 13px; color: var(--muted); font-weight: 500; }
.meta { font-family: var(--mono); font-size: 13px; color: var(--muted); }
.draft-note { border: 1px dashed var(--home); color: var(--home); border-radius: 8px; padding: 10px 14px; font-size: 14px; }
.crumbs { font-family: var(--mono); font-size: 13px; color: var(--muted); }
.crumbs a { color: var(--muted); }

@media (max-width: 900px) {
  .flow-grid { grid-template-columns: 1fr; gap: 44px; }
  .chips { grid-template-columns: repeat(auto-fit, minmax(150px, max-content)); justify-content: center; justify-items: center; gap: 10px; }
  .numbers { grid-template-columns: 1fr 1fr; }
  .numbers > div:nth-child(3) { border-left: 0; }
  .numbers > div:nth-child(n+3) { border-top: 1px solid var(--steel); }
  .split, .grid3, .grid2 { grid-template-columns: 1fr; }
}
@media (max-width: 420px) {
  .wrap { padding-inline: 16px; }
  .numbers { grid-template-columns: 1fr; }
  .numbers > div { border-left: 0; border-top: 1px solid var(--steel); }
  .numbers > div:first-child { border-top: 0; }
  .card .name { font-size: 30px; }
}
@media (prefers-reduced-motion: reduce) {
  .core-ring { animation: none; }
  .card, .core { transition: none; }
  .card:hover, .card:focus-visible { transform: none; }
}