:root {
  --bg: #f2efe6;
  --paper: #fbfaf5;
  --fg: #141414;
  --muted: #5d5a52;
  --line: #d9d4c5;
  --surface: #fbfaf5;
  --accent: #2f6b4f;
  --accent-ink: #fff;
  --warn: #c2410c;
  --ok: #2f6b4f;
  --sans: "IBM Plex Sans", ui-sans-serif, system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --ease: cubic-bezier(.22, 1, .36, 1);
  color-scheme: light;
}
body {
  background-color: var(--bg);
  /* paper grain */
  background-image: radial-gradient(#1414140a 1px, transparent 1px);
  background-size: 4px 4px;
}
h1, h2, h3 { font-family: var(--mono); font-weight: 500; letter-spacing: -.035em; }
code { font-size: .88em; padding: .08em .35em; border: 1px solid var(--line); border-radius: 3px; background: var(--paper); }
.nav__brand { font-family: var(--mono); font-weight: 600; }
.nav { background: color-mix(in srgb, var(--bg) 88%, transparent); }

/* ---------- hero ---------- */
.hero { padding: 72px 0 0; }
.hero__grid { display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 5fr); gap: 56px; align-items: center; }
.stamp {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 4px 10px; margin-bottom: 26px;
  border: 1.5px solid var(--warn); border-radius: 3px;
  color: var(--warn); font: 500 12px/1.4 var(--mono); letter-spacing: .04em; text-transform: uppercase;
  transform: rotate(-1.5deg);
}
.stamp span { font: 600 15px/1 var(--sans); letter-spacing: 0; }
.stamp i { text-transform: none; }
.hero h1 { font-size: clamp(36px, 4.9vw, 64px); line-height: 1.06; }
.redact { position: relative; white-space: nowrap; }
.redact::after {
  content: ""; position: absolute; left: -.08em; right: -.08em; top: .12em; bottom: .02em;
  background: var(--fg); transform-origin: left; transform: scaleX(0);
  animation: redact 6s var(--ease) 1s infinite;
}
@keyframes redact { 0%, 8% { transform: scaleX(0); } 18%, 62% { transform: scaleX(1); } 72%, 100% { transform: scaleX(0); transform-origin: right; } }
.lede { margin-top: 26px; max-width: 560px; font-size: clamp(16px, 1.6vw, 18px); color: var(--muted); line-height: 1.65; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.btn { display: inline-flex; padding: 10px 18px; border-radius: 4px; background: var(--fg); color: var(--paper); font: 500 14px/1.4 var(--mono); text-decoration: none; box-shadow: 3px 3px 0 var(--accent); transition: transform .15s, box-shadow .15s; }
.btn:hover { transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--accent); }
.btn--ghost { background: transparent; color: var(--fg); border: 1.5px solid var(--fg); box-shadow: none; }
.btn--ghost:hover { box-shadow: 3px 3px 0 var(--line); }
.meta { margin-top: 18px; font: 400 13px var(--mono); color: var(--muted); }

/* the file, both ways */
.dossier { margin: 0; }
.dossier__tabs { display: flex; gap: 4px; }
.dossier__tabs button {
  flex: 1; text-align: left; padding: 10px 14px 9px;
  border: 1.5px solid var(--fg); border-bottom: 0; border-radius: 6px 6px 0 0;
  background: var(--bg); color: var(--muted);
  font: 500 13px/1.3 var(--mono);
  transition: background .2s, color .2s;
}
.dossier__tabs button small { display: block; font-size: 11px; font-weight: 400; color: var(--muted); }
.dossier__tabs button[aria-selected="true"] { background: var(--paper); color: var(--fg); position: relative; z-index: 1; margin-bottom: -1.5px; padding-bottom: 10.5px; }
.dossier__tabs button[data-side="cipher"][aria-selected="true"] small { color: var(--accent); }
.dossier__tabs button[data-side="plain"][aria-selected="true"] small { color: var(--warn); }
.dossier__sheet {
  position: relative;
  border: 1.5px solid var(--fg); border-radius: 0 0 6px 6px;
  background: var(--paper);
  box-shadow: 8px 8px 0 #14141414;
  padding: 26px 24px 22px;
  min-height: 240px;
  container-type: inline-size;
}
.dossier__text { margin: 0; font: 400 min(14px, 100cqw / 67 / .6)/1.85 var(--mono); white-space: pre; overflow: hidden; }
.dossier__text .o { color: #9a958a; }
.dossier__text .h { color: var(--fg); }
.dossier__text .a { color: var(--accent); }
.dossier__text .k { color: var(--fg); font-weight: 600; }
.dossier__text .v { color: var(--warn); }
.dossier__text .x { color: #b6b1a4; }
.dossier__label { position: absolute; right: 16px; bottom: 12px; font: 500 11px var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.dossier figcaption { margin-top: 18px; font-size: 13px; color: var(--muted); line-height: 1.6; }

/* ---------- sections ---------- */
.sec { padding-top: 120px; }
.sec__head { margin-bottom: 40px; max-width: 760px; }
.kicker { font: 500 12px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--accent); margin-bottom: 16px; }
.sec h2 { font-size: clamp(28px, 3.8vw, 44px); line-height: 1.12; }
.body { margin-top: 18px; color: var(--muted); line-height: 1.7; max-width: 52ch; }
.body a { color: var(--fg); text-underline-offset: 3px; }
.body b { color: var(--fg); font-weight: 600; }

.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; border: 1.5px solid var(--fg); border-radius: 6px; background: var(--paper); }
.steps li { padding: 28px 26px; display: flex; flex-direction: column; }
.steps li + li { border-left: 1.5px dashed var(--line); }
.steps li:nth-child(2) { transition-delay: .06s; } .steps li:nth-child(3) { transition-delay: .12s; }
.steps__n { font: 500 13px var(--mono); color: var(--accent); }
.steps h3 { font-size: 24px; margin: 10px 0 10px; }
.steps p { color: var(--muted); font-size: 15px; line-height: 1.6; flex: 1; }
.steps pre { margin: 20px 0 0; padding: 14px 16px; border-radius: 4px; background: var(--fg); color: #e9e6dc; font-size: 12.5px; line-height: 1.6; overflow-x: auto; }
.steps .pr, .term .pr { color: #8fc3a8; user-select: none; }
.steps .r { color: #ff7b72; }

.sec--term { padding-top: 64px; }
.term { border-radius: 8px; overflow: hidden; background: #161614; color: #e9e6dc; box-shadow: 0 0 0 1.5px var(--fg), 10px 10px 0 #14141414; }
.term__bar { height: 36px; display: flex; align-items: center; gap: 7px; padding: 0 12px 0 14px; background: #232320; border-bottom: 1px solid #ffffff12; }
.term__bar > i { width: 11px; height: 11px; border-radius: 50%; background: #ff5f57; }
.term__bar > i:nth-child(2) { background: #febc2e; } .term__bar > i:nth-child(3) { background: #28c840; }
.term__bar span { margin-left: 10px; font: 500 12px var(--mono); color: #9a958a; }
.term__replay { margin-left: auto; padding: 3px 10px; border-radius: 4px; border: 1px solid #ffffff26; font: 500 11.5px var(--mono); color: #c9c5b9; }
.term__replay:hover { background: #ffffff14; }
.term__body { margin: 0; padding: 20px 22px; height: 470px; overflow: hidden; font: 400 13.5px/1.65 var(--mono); white-space: pre-wrap; word-break: break-word; }
.term__body .c { color: #8a867b; font-style: italic; }
.term__body .d { color: #8fc3a8; }
.term__body .ok { color: #8fc3a8; }
.term__body .r { color: #ff7b72; }
.term__body .y { color: #e3b341; }
.term__body .cur { display: inline-block; width: .6em; height: 1.15em; vertical-align: -.2em; background: #e9e6dc; animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.term__note { margin-top: 12px; font: 400 12.5px var(--mono); color: var(--muted); }

.flow { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 56px; align-items: center; }
.backends { margin-top: 26px; display: grid; gap: 10px; }
.backends li { padding: 12px 16px; border: 1.5px solid var(--fg); border-radius: 4px; background: var(--paper); font-size: 15px; color: var(--muted); }
.backends b { color: var(--fg); font-weight: 600; }
.diagram { width: 100%; height: auto; color: var(--fg); overflow: visible; }
.dg-box rect { fill: var(--paper); stroke: var(--fg); stroke-width: 1.5; }
.dg-key rect { stroke-dasharray: 5 4; }
.dg-core rect { fill: var(--fg); }
.dg-core .dg-h { fill: var(--paper); }
.dg-core .dg-s { fill: #b9b4a6; }
.dg-h { font: 600 15px var(--mono); fill: var(--fg); }
.dg-m { font: 500 13px var(--mono); fill: var(--accent); }
.dg-s { font: 400 12px var(--sans); fill: var(--muted); }
.dg-wires path { fill: none; stroke: currentColor; stroke-width: 1.5; }
.dg-wires .dg-dash { stroke-dasharray: 5 4; }
.dg-wires .dg-flow { stroke: var(--accent); stroke-dasharray: 6 6; animation: flow 1.2s linear infinite; color: var(--accent); }
@keyframes flow { to { stroke-dashoffset: -24; } }

.rules { margin: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.rules div { padding: 22px 22px 24px; border: 1.5px solid var(--fg); border-radius: 6px; background: var(--paper); transition: transform .2s, box-shadow .2s; }
.rules div:hover { transform: translate(-2px, -2px); box-shadow: 4px 4px 0 var(--accent); }
.rules dt { font: 600 15px/1.3 var(--mono); margin-bottom: 8px; }
.rules dt::before { content: "✓ "; color: var(--accent); }
.rules dd { margin: 0; color: var(--muted); font-size: 14.5px; line-height: 1.6; }
.rules div:nth-child(3n+2) { transition-delay: .05s; } .rules div:nth-child(3n) { transition-delay: .1s; }

.split { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 56px; align-items: center; }
.paper { margin: 0; padding: 26px 28px; border: 1.5px solid var(--fg); border-radius: 6px; background: var(--paper); box-shadow: 8px 8px 0 #14141414; font-size: 13.5px; line-height: 1.75; overflow-x: auto; }
.paper .c { color: #9a958a; font-style: italic; }
.paper .k { color: var(--accent); }

.install { max-width: 880px; }
.install h2 { margin-bottom: 26px; }
.tabs { display: flex; gap: 4px; margin-bottom: -1.5px; }
.tabs button { padding: 8px 16px; border: 1.5px solid transparent; border-bottom: 0; border-radius: 6px 6px 0 0; font: 500 13px var(--mono); color: var(--muted); }
.tabs button[aria-selected="true"] { border-color: var(--fg); background: var(--paper); color: var(--fg); }
.block { position: relative; border: 1.5px solid var(--fg); border-radius: 0 6px 6px 6px; background: var(--paper); }
.block pre { margin: 0; padding: 18px 56px 18px 20px; overflow-x: auto; font-size: 13px; line-height: 1.75; }
.block .copy { position: absolute; top: 8px; right: 8px; }
.fine { margin-top: 16px; font-size: 14px; color: var(--muted); line-height: 1.65; }
.fine a { color: var(--fg); text-underline-offset: 3px; }

@media (max-width: 960px) {
  .hero__grid, .flow, .split { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .steps { grid-template-columns: minmax(0, 1fr); }
  .steps li + li { border-left: 0; border-top: 1.5px dashed var(--line); }
  .rules { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
}
@media (max-width: 560px) {
  .hero { padding-top: 44px; }
  .rules { grid-template-columns: minmax(0, 1fr); }
  .term__body { height: 420px; font-size: 12px; padding: 16px; }
  .dossier__sheet { padding: 20px 16px; }
}