/* Layout: editorial single column with a live "signature stream" hero; ink-on-paper, one ultramarine accent. */
:root {
  --paper: #FAFAF7; --paper-2: #F1F1EC; --ink: #0D1330; --muted: #5A6078; --line: #E1E2E9;
  --sig: #2334E8; --sig-soft: #E7E9FD; --on-sig: #FFFFFF; --ok: #0B8A5C; --ok-bg: #E2F3EB; --bad: #C8322D; --bad-bg: #FAE6E5;
  --night: #0A0F27; --night-2: #121A3D; --night-ink: #ECEEF8; --night-muted: #9AA1BE; --night-sig: #8B95FF;
  --display: "Instrument Serif", "Iowan Old Style", Georgia, serif;
  --sans: "Inter Tight", "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #080B1A; --paper-2: #0F1428; --ink: #ECEEF8; --muted: #9AA1BE; --line: #1F2645;
    --sig: #7D88FF; --sig-soft: #161D45; --on-sig: #080B1A; --ok: #3CCB8F; --ok-bg: #0E2A20; --bad: #FF6E66; --bad-bg: #2E1513;
    --night: #050817; --night-2: #0D1330; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #080B1A; --paper-2: #0F1428; --ink: #ECEEF8; --muted: #9AA1BE; --line: #1F2645;
  --sig: #7D88FF; --sig-soft: #161D45; --on-sig: #080B1A; --ok: #3CCB8F; --ok-bg: #0E2A20; --bad: #FF6E66; --bad-bg: #2E1513;
  --night: #050817; --night-2: #0D1330; color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; background: var(--paper); color: var(--ink); font: 17px/1.6 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; text-underline-offset: 3px; }
h1, h2, h3 { margin: 0 0 .5em; text-wrap: balance; }
h1, h2 { font-family: var(--display); font-weight: 400; letter-spacing: -0.01em; line-height: 1.04; }
h1 { font-size: clamp(2.8rem, 6.4vw, 5.2rem); }
h2 { font-size: clamp(2.1rem, 4.4vw, 3.4rem); max-width: 22ch; }
h1 em, h2 em, .big em, h3 em { font-style: italic; color: var(--sig); }
h3 { font-size: 1.08rem; font-weight: 600; line-height: 1.3; letter-spacing: -0.005em; }
p { margin: 0 0 1em; }
.mono { font-family: var(--mono); font-size: .86em; }
.muted { color: var(--muted); }
.small { font-size: .84rem; }
.wrap { max-width: 1160px; margin: 0 auto; padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
section { padding-block: 104px; }
.band { background: var(--paper-2); border-block: 1px solid var(--line); }
.lede { font-size: 1.18rem; line-height: 1.55; max-width: 60ch; }
.narrow { max-width: 62ch; }
.eyebrow { font-family: var(--mono); font-size: .76rem; color: var(--sig); text-transform: uppercase; letter-spacing: .12em; margin-bottom: 18px; }

.nav { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 10; background: color-mix(in srgb, var(--paper) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.nav-in { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 650; font-size: 1.15rem; text-decoration: none; letter-spacing: -0.01em; }
.mark path { fill: none; stroke-width: 5.5; stroke-linecap: round; stroke-linejoin: round; }
.mark .m1 { stroke: var(--ink); } .mark .m2 { stroke: var(--sig); }
.nav nav { display: flex; align-items: center; gap: 24px; font-size: .92rem; }
.nav nav a:not(.btn) { text-decoration: none; color: var(--muted); }
.nav nav a:not(.btn):hover { color: var(--ink); }

.btn { display: inline-block; font: 600 .96rem var(--sans); background: var(--sig); color: var(--on-sig); border: 1px solid var(--sig); border-radius: 999px; padding: 12px 22px; text-decoration: none; cursor: pointer; text-align: center; }
.btn:hover { filter: brightness(1.08); }
.btn:focus-visible, .link-btn:focus-visible, a:focus-visible { outline: 2px solid var(--sig); outline-offset: 3px; }
.btn-sm { padding: 8px 16px; font-size: .88rem; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ink); filter: none; }
.btn-ghost.done { border-color: var(--ok); color: var(--ok); }
.btn-warn { background: transparent; color: var(--ink); border: 1px dashed var(--bad); }
.btn-warn:hover { background: var(--bad-bg); filter: none; }
.btn[disabled] { opacity: .45; cursor: not-allowed; }
.link-btn { background: none; border: 0; color: var(--muted); font: inherit; font-size: .9rem; text-decoration: underline; cursor: pointer; padding: 6px 0; margin-top: 8px; }
.ctas { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 12px; }

.hero { padding-block: 88px 104px; }
.hero-in { display: grid; grid-template-columns: 1.15fr .85fr; gap: 64px; align-items: center; }
.hero-copy, .stream { min-width: 0; }
.stream { margin: 0; background: var(--night); color: var(--night-ink); border-radius: 14px; padding: 18px; box-shadow: 0 24px 60px rgba(13, 19, 48, .22); }
.stream-head { display: flex; align-items: center; gap: 10px; font-size: .8rem; padding-bottom: 12px; border-bottom: 1px solid rgba(255,255,255,.08); }
.stream-head .muted { color: var(--night-muted); margin-left: auto; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: #3CCB8F; box-shadow: 0 0 0 0 rgba(60,203,143,.6); animation: pulse 2s infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(60,203,143,.55); } 70% { box-shadow: 0 0 0 8px rgba(60,203,143,0); } 100% { box-shadow: 0 0 0 0 rgba(60,203,143,0); } }
.stream-list { list-style: none; padding: 0; margin: 12px 0; display: grid; gap: 8px; min-height: 360px; }
.stream-list li { background: var(--night-2); border-radius: 8px; padding: 10px 12px; font: .76rem/1.5 var(--mono); border-left: 3px solid #3CCB8F; animation: in .5s ease-out; overflow: hidden; }
.stream-list li.refused { border-left-color: #FF6E66; }
.stream-list .row1 { display: flex; justify-content: space-between; gap: 10px; color: var(--night-ink); }
.stream-list .act { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.stream-list .st { flex: none; font-weight: 500; color: #3CCB8F; }
.stream-list li.refused .st { color: #FF6E66; }
.stream-list .row2 { color: var(--night-muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
@keyframes in { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .stream-list li, .dot { animation: none; } }
.stream figcaption { font-size: .7rem; color: var(--night-muted); }

.statement { padding-block: 120px; }
.big { font-family: var(--display); font-size: clamp(1.7rem, 3.3vw, 2.6rem); line-height: 1.22; max-width: 30ch; letter-spacing: -0.005em; }
.muted-strong { color: var(--muted); }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin: 40px 0 56px; }
.stat-card { background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 22px; display: flex; flex-direction: column; min-width: 0; }
.stat-card .num { font-family: var(--display); font-size: 3.4rem; line-height: 1; color: var(--sig); margin-bottom: 14px; }
.stat-card p:not(.num) { font-size: .95rem; flex: 1; }
.src { color: var(--muted); font-size: .72rem; text-decoration: none; border-top: 1px solid var(--line); padding-top: 10px; }
.src:hover { color: var(--sig); }
.gap { display: grid; grid-template-columns: 1fr 1fr; gap: 0; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; background: var(--paper); }
.gap > div { padding: 28px; min-width: 0; }
.gap > div + div { border-left: 1px solid var(--line); background: var(--sig-soft); }
.gap h3 { font-family: var(--display); font-weight: 400; font-size: 1.7rem; }
.gap p { margin: 0; color: var(--muted); }
.gap > div + div p { color: var(--ink); }

.numbers { display: grid; grid-template-columns: repeat(4, 1fr); border-block: 1px solid var(--line); margin: 40px 0; }
.numbers > div { padding: 24px 8px; min-width: 0; }
.numbers > div + div { border-left: 1px solid var(--line); padding-left: 24px; }
.numbers .n { font-family: var(--display); font-size: clamp(2.6rem, 5vw, 4rem); line-height: 1; margin-bottom: 6px; font-variant-numeric: tabular-nums; }
.numbers .l { font-family: var(--mono); font-size: .76rem; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; margin: 0; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 32px 0 16px; }
.cards.four { grid-template-columns: repeat(4, 1fr); }
.card { background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 24px; min-width: 0; }
.band .card { background: var(--paper); }
.card p:last-child { margin-bottom: 0; }
.tag { color: var(--bad); font-size: .7rem; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 12px; }
.card h3 { font-family: var(--display); font-weight: 400; font-size: 1.6rem; line-height: 1.1; }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px 36px; margin: 40px 0 64px; }
.step .num { font: 500 .78rem var(--mono); color: var(--sig); border: 1px solid var(--sig); border-radius: 50%; width: 28px; height: 28px; display: inline-grid; place-items: center; margin-bottom: 12px; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.split > * { min-width: 0; }
.code { background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 18px; overflow-x: auto; margin: 0; font-size: .8rem; line-height: 1.6; white-space: pre; }

.dark { background: var(--night); color: var(--night-ink); }
.dark .eyebrow { color: var(--night-sig); }
.dark h2 { max-width: 26ch; }
.dark h2 em { color: var(--night-sig); }
.road { list-style: none; padding: 0; margin: 56px 0 24px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid rgba(255,255,255,.14); }
.road li { padding: 24px 24px 0 0; position: relative; min-width: 0; }
.road li::before { content: ""; position: absolute; top: -5px; left: 0; width: 9px; height: 9px; border-radius: 50%; background: var(--night-sig); }
.road li:not(:first-child)::before { background: transparent; border: 1px solid var(--night-sig); }
.road .when { color: var(--night-sig); font-size: .74rem; text-transform: uppercase; letter-spacing: .1em; }
.road h3 { font-family: var(--display); font-weight: 400; font-size: 1.6rem; }
.road p:not(.when) { color: var(--night-muted); font-size: .95rem; }
.dim { color: var(--night-muted); }

.notice { border: 1px solid var(--bad); background: var(--bad-bg); padding: 12px 16px; border-radius: 8px; }
.demo { display: grid; grid-template-columns: 1fr 1fr 1.2fr; gap: 20px; margin-top: 28px; }
.demo-col { background: var(--paper-2); border: 1px solid var(--line); border-radius: 10px; padding: 18px; min-width: 0; }
.demo-col h3 { margin-top: 4px; }
.demo-col h3:not(:first-child) { margin-top: 20px; }
.demo .code { max-height: 220px; overflow: auto; white-space: pre-wrap; word-break: break-all; }
.btn-col { display: grid; gap: 8px; }
.btn-col .btn { width: 100%; font-size: .86rem; padding: 9px 14px; border-radius: 8px; text-align: left; }
.ids { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; }
.ids li { display: flex; justify-content: space-between; gap: 8px; border-bottom: 1px dotted var(--line); padding-bottom: 4px; flex-wrap: wrap; }
.ledger { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; max-height: 340px; overflow: auto; }
.ledger li.entry { background: var(--paper); border: 1px solid var(--line); border-left: 3px solid var(--line); border-radius: 6px; padding: 8px 10px; font-size: .78rem; font-family: var(--mono); word-break: break-all; }
.ledger li.entry.ok { border-left-color: var(--ok); }
.ledger li.entry.bad { border-left-color: var(--bad); }
.ledger .why { color: var(--bad); font-family: var(--sans); }
.tick { color: var(--ok); font-weight: 700; }
.result { border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px; font-size: .9rem; background: var(--paper); }
.result.ok { border-color: var(--ok); background: var(--ok-bg); }
.result.bad { border-color: var(--bad); background: var(--bad-bg); }
.result h4 { margin: 0 0 8px; font-size: 1rem; }
.result ul { margin: 0; padding-left: 18px; }
.result li.fail { color: var(--bad); }
.result li.pass { color: var(--ok); }
.result .trig { font-family: var(--mono); font-size: .8rem; margin: 10px 0 0; }

.form { display: grid; gap: 12px; align-content: start; }
.foot { padding-block: 40px; border-top: 1px solid var(--line); }
.foot-in p { max-width: 760px; }

@media (max-width: 980px) {
  .hero-in, .split { grid-template-columns: 1fr; gap: 40px; }
  .demo { grid-template-columns: 1fr; }
  .stats, .cards.four, .road { grid-template-columns: 1fr 1fr; }
  .road li { padding-bottom: 24px; }
  .cards, .steps { grid-template-columns: 1fr 1fr; }
  .numbers { grid-template-columns: 1fr 1fr; }
  .numbers > div:nth-child(3) { border-left: 0; padding-left: 8px; }
  .numbers > div:nth-child(n+3) { border-top: 1px solid var(--line); }
}
@media (max-width: 640px) {
  section { padding-block: 72px; }
  .statement { padding-block: 80px; }
  .stats, .cards, .cards.four, .steps, .road, .gap { grid-template-columns: 1fr; }
  .gap > div + div { border-left: 0; border-top: 1px solid var(--line); }
  .nav nav a:not(.btn) { display: none; }
  .stream-list { min-height: 300px; }
}