/* PulseDeck — shared site shell (ECG paper). Page-specific rules stay inline. */
:root {
  --paper: #FBEEEB;
  --card: #FFF9F7;
  --ink: #2B1417;
  --body: #5A3A40;
  --crimson: #D93A52;
  --muted: #97696E;
  --hair: rgba(217, 58, 82, 0.28);
  --grid-fine: rgba(217, 58, 82, 0.045);
  --grid-bold: rgba(217, 58, 82, 0.09);
  --mm: 5px; /* 1 ecg mm */
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "Space Grotesk", system-ui, sans-serif;
  background:
    repeating-linear-gradient(to right, var(--grid-bold) 0 1px, transparent 1px calc(var(--mm) * 5)),
    repeating-linear-gradient(to bottom, var(--grid-bold) 0 1px, transparent 1px calc(var(--mm) * 5)),
    repeating-linear-gradient(to right, var(--grid-fine) 0 1px, transparent 1px var(--mm)),
    repeating-linear-gradient(to bottom, var(--grid-fine) 0 1px, transparent 1px var(--mm)),
    var(--paper);
  color: var(--ink);
  line-height: 1.55;
}
a { color: var(--crimson); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--crimson); outline-offset: 3px; border-radius: 2px; }

.wrap { max-width: 1060px; margin: 0 auto; padding: 0 24px; }

/* header */
header { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 22px 0 0; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.15rem; letter-spacing: -0.01em; color: var(--ink); text-decoration: none; }
.brand svg { display: block; }
.brand b { color: var(--crimson); font-weight: 700; }
nav.top { display: flex; flex-wrap: wrap; gap: 22px; }
nav.top a { font-family: "IBM Plex Mono", monospace; font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); text-decoration: none; }
nav.top a:hover, nav.top a[aria-current="page"] { color: var(--crimson); }

.eyebrow { font-family: "IBM Plex Mono", monospace; font-size: 0.75rem; letter-spacing: 0.22em; color: var(--crimson); text-transform: uppercase; }

/* document pages */
.doc { max-width: 760px; margin: 0 auto; padding: 56px 0 0; }
.doc-head { border-bottom: 1.5px solid var(--hair); padding-bottom: 18px; }
.doc-head h1 { font-size: clamp(2rem, 5vw, 2.9rem); letter-spacing: -0.03em; line-height: 1.05; margin: 14px 0 0; }
.doc-meta { font-family: "IBM Plex Mono", monospace; font-size: 0.74rem; letter-spacing: 0.1em; color: var(--muted); text-transform: uppercase; margin-top: 12px; }
.doc-lede { font-size: 1.05rem; color: var(--body); margin-top: 22px; }

.doc section { margin-top: 34px; }
.doc h2 {
  font-size: 1.15rem; letter-spacing: -0.01em; margin-bottom: 8px;
  display: flex; align-items: baseline; gap: 10px;
}
.doc h2::before {
  content: attr(data-lead);
  font-family: "IBM Plex Mono", monospace; font-size: 0.68rem; letter-spacing: 0.16em;
  color: var(--crimson); text-transform: uppercase; flex: none;
}
.doc p, .doc li { color: var(--body); }
.doc p + p { margin-top: 12px; }
.doc ul + p { margin-top: 14px; }
.doc ul { margin: 10px 0 0 0; padding-left: 0; list-style: none; }
.doc li { position: relative; padding-left: 20px; margin-top: 8px; }
.doc li::before { content: ""; position: absolute; left: 2px; top: 0.62em; width: 9px; height: 1.5px; background: var(--crimson); }
.doc strong { color: var(--ink); }

.callout {
  border: 1.5px solid var(--hair); border-left-width: 4px; border-radius: 12px;
  background: var(--card); padding: 18px 20px; margin-top: 20px;
}
.callout p { color: var(--ink); }

/* footer */
.disclaimer { margin: 76px 0 0; text-align: center; font-family: "IBM Plex Mono", monospace; font-size: 0.78rem; letter-spacing: 0.06em; color: var(--muted); }
footer { margin: 26px 0 0; border-top: 1.5px solid var(--hair); padding: 26px 0 40px; }
.foot-row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 14px; align-items: baseline; }
.foot-links { display: flex; flex-wrap: wrap; gap: 20px; }
.foot-links a { font-family: "IBM Plex Mono", monospace; font-size: 0.76rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); text-decoration: none; }
.foot-links a:hover { color: var(--crimson); }
.cal { font-family: "IBM Plex Mono", monospace; font-size: 0.72rem; letter-spacing: 0.12em; color: var(--muted); }

@media (max-width: 760px) {
  nav.top { display: none; }
  .doc { padding-top: 40px; }
}