:root {
  --bg: #07090c;
  --bg2: #0b0f14;
  --panel: #0e131a;
  --line: #243041;
  --line-soft: #1a2330;
  --text: #e8eef4;
  --body: #c9d3dd;
  --muted: #8d9aa8;
  --accent: #22d3ee;
  --accent-dim: rgba(34, 211, 238, .12);
  --warn: #f59e0b;
  --danger: #f87171;
  --ok: #4ade80;
  --mono: ui-monospace, "Cascadia Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --sans: "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.7 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 32px; } }

.tag { display: inline-block; font: 600 12px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--accent); border: 1px solid var(--accent); padding: 7px 10px; }
.btn { display: inline-flex; align-items: center; gap: 8px; font: 600 15px/1 var(--sans); padding: 14px 20px; border: 1px solid var(--accent); background: var(--accent); color: #031317; }
.btn:hover { text-decoration: none; filter: brightness(1.1); }
.btn.ghost { background: transparent; color: var(--accent); }
.btn.ghost:hover { background: var(--accent-dim); }
.btn.sm { padding: 10px 14px; font-size: 14px; }

header { position: sticky; top: 0; z-index: 20; background: rgba(7, 9, 12, .9); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line-soft); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.logo { display: flex; align-items: center; gap: 10px; color: var(--text); font: 700 15px/1 var(--mono); letter-spacing: .18em; }
.logo:hover { text-decoration: none; }
.nav ul { display: none; list-style: none; margin: 0; padding: 0; gap: 26px; }
.nav ul a { color: var(--muted); font-size: 14px; }
.nav ul a:hover { color: var(--text); text-decoration: none; }
@media (min-width: 900px) { .nav ul { display: flex; } }

.crumbs { font: 13px/1.4 var(--mono); color: var(--muted); padding: 26px 0 0; }
.crumbs a { color: var(--muted); }
.crumbs span { margin: 0 8px; opacity: .6; }

.art-head { padding: 34px 0 40px; border-bottom: 1px solid var(--line-soft); background: radial-gradient(700px 300px at 85% 0%, rgba(34, 211, 238, .08), transparent 60%); }
.art-head h1 { font-size: clamp(32px, 5.4vw, 54px); line-height: 1.1; font-weight: 800; margin: 18px 0 16px; max-width: 900px; letter-spacing: -.01em; }
.art-head .lead { font-size: clamp(18px, 2.1vw, 21px); color: var(--muted); max-width: 760px; margin: 0; }
.meta { margin-top: 22px; font: 13px/1.4 var(--mono); color: var(--muted); }

.layout { display: grid; gap: 48px; padding: 48px 0 72px; }
@media (min-width: 1040px) { .layout { grid-template-columns: minmax(0, 1fr) 300px; } }
article { max-width: 760px; color: var(--body); }
article h2 { color: var(--text); font-size: clamp(24px, 3vw, 30px); line-height: 1.2; margin: 48px 0 14px; scroll-margin-top: 84px; }
article h2:first-child { margin-top: 0; }
article h3 { color: var(--text); font-size: 20px; margin: 30px 0 8px; }
article p { margin: 0 0 18px; }
article ul, article ol { margin: 0 0 20px; padding-left: 22px; }
article li { margin-bottom: 8px; }
article li::marker { color: var(--accent); }
article strong { color: var(--text); }

.box { border: 1px solid var(--line); background: var(--panel); padding: 20px 22px; margin: 24px 0; }
.box > :last-child { margin-bottom: 0; }
.box.tip { border-left: 3px solid var(--accent); }
.box.warn { border-left: 3px solid var(--warn); }
.box.danger { border-left: 3px solid var(--danger); }
.box .bt { display: block; font: 700 12px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; margin-bottom: 10px; }
.box.tip .bt { color: var(--accent); }
.box.warn .bt { color: var(--warn); }
.box.danger .bt { color: var(--danger); }

.sample { border: 1px solid var(--line); background: var(--bg2); margin: 24px 0; font-size: 15px; }
.sample .sh { padding: 10px 14px; border-bottom: 1px solid var(--line); font: 12px/1.5 var(--mono); color: var(--muted); }
.sample .sb { padding: 14px; color: var(--body); }

.stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin: 8px 0 24px; }
@media (min-width: 720px) { .stats { grid-template-columns: repeat(4, 1fr); } }
.stats div { background: var(--panel); padding: 20px 18px; }
.stats b { display: block; font: 800 34px/1 var(--sans); color: var(--accent); margin-bottom: 8px; }
.stats span { font-size: 14px; color: var(--muted); line-height: 1.45; display: block; }
.steps-list { counter-reset: s; list-style: none; padding: 0; }
.steps-list li { counter-increment: s; position: relative; padding: 4px 0 14px 50px; margin: 0; border-left: 1px solid var(--line); margin-left: 16px; padding-left: 34px; }
.steps-list li::before { content: counter(s); position: absolute; left: -16px; top: 0; width: 32px; height: 32px; display: grid; place-items: center; background: var(--bg); border: 1px solid var(--accent); color: var(--accent); font: 700 14px/1 var(--mono); }
.steps-list li:last-child { border-left-color: transparent; }

table { width: 100%; border-collapse: collapse; margin: 20px 0 24px; font-size: 15px; }
th, td { text-align: left; padding: 12px 14px; border: 1px solid var(--line); vertical-align: top; }
th { background: var(--panel); color: var(--text); font-weight: 600; }
.table-wrap { overflow-x: auto; }

details { border: 1px solid var(--line); background: var(--bg2); margin-bottom: 10px; }
summary { cursor: pointer; padding: 16px 48px 16px 18px; font-weight: 600; color: var(--text); list-style: none; position: relative; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 18px; top: 50%; transform: translateY(-50%); font: 400 22px/1 var(--mono); color: var(--accent); }
details[open] summary::after { content: "−"; }
details p { margin: 0; padding: 0 18px 18px; }

aside .sticky { position: sticky; top: 88px; display: grid; gap: 18px; }
.toc, .side-cta { border: 1px solid var(--line); background: var(--panel); padding: 20px; }
.toc b, .side-cta b { display: block; font: 700 12px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--muted); margin-bottom: 12px; }
.toc ol { margin: 0; padding-left: 18px; font-size: 14px; }
.toc li { margin-bottom: 6px; }
.toc a { color: var(--body); }
.toc a:hover { color: var(--accent); }
.side-cta p { margin: 0 0 14px; font-size: 15px; color: var(--body); }
.side-cta .btn { width: 100%; justify-content: center; }
@media (max-width: 1039px) { aside { display: none; } }

.cta-band { border: 1px solid var(--line); background: radial-gradient(500px 200px at 20% 50%, rgba(34, 211, 238, .10), transparent 70%), var(--panel); padding: 30px; margin: 44px 0 0; }
.cta-band h2 { margin: 0 0 10px; }
.cta-band p { margin: 0 0 20px; }
.cta-band .row { display: flex; flex-wrap: wrap; gap: 10px; }

.related { border-top: 1px solid var(--line-soft); padding: 56px 0 72px; }
.related h2 { font-size: 26px; margin: 0 0 22px; }
.cards { display: grid; gap: 14px; }
@media (min-width: 720px) { .cards { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1040px) { .cards { grid-template-columns: repeat(4, 1fr); } }
.card { display: block; border: 1px solid var(--line); background: var(--bg2); padding: 20px; color: var(--text); transition: .15s; }
.card:hover { border-color: var(--accent); text-decoration: none; }
.card .k { font: 11px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--warn); }
.card .k.biz { color: var(--accent); }
.card h3 { font-size: 17px; line-height: 1.35; margin: 10px 0 8px; }
.card p { margin: 0; font-size: 14px; color: var(--muted); line-height: 1.55; }

.hub-group { padding: 48px 0 8px; }
.hub-group h2 { font-size: clamp(24px, 3vw, 32px); margin: 0 0 8px; }
.hub-group > p { color: var(--muted); margin: 0 0 22px; max-width: 700px; }
.cards.two { grid-template-columns: 1fr; }
@media (min-width: 720px) { .cards.two { grid-template-columns: repeat(2, 1fr); } }

footer { border-top: 1px solid var(--line-soft); padding: 40px 0; color: var(--muted); font-size: 14px; }
.foot { display: grid; gap: 28px; }
@media (min-width: 820px) { .foot { grid-template-columns: 1.2fr 1fr 1fr; } }
.foot b { display: block; color: var(--text); font: 700 12px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; margin-bottom: 12px; }
.foot ul { list-style: none; margin: 0; padding: 0; }
.foot li { margin-bottom: 8px; }
.foot a { color: var(--muted); }
.foot a:hover { color: var(--accent); }
.foot-bottom { margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--line-soft); font: 13px/1.4 var(--mono); }