/* Own Your Stack — editorial system. Paper & ink, Fraunces / Inter / Space Mono,
   a single flat purple accent used sparingly. Shared across the launch index and
   every product page. */

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; padding: 0; }

:root {
  --paper: #f1eee6;
  --paper-2: #f7f4ec;       /* insets / figures */
  --ink: #1b1a16;
  --ink-soft: #38352c;
  --muted: #6b6555;
  --faint: #9a9483;
  --rule: #d9d3c4;
  --rule-2: #c8c1ad;
  --accent: #6d28d9;        /* the single accent — flat ink, used sparingly */
  --accent-deep: #4c1d95;
  --accent-wash: rgba(109, 40, 217, 0.07);
  --ok: #3f7d52;
  --maxw: 1180px;
  --gutter: clamp(20px, 5vw, 60px);
  --serif: 'Fraunces', Georgia, 'Times New Roman', serif;
  --sans: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --mono: 'Space Mono', ui-monospace, 'SFMono-Regular', monospace;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

::selection { background: var(--accent); color: var(--paper); }
a { color: inherit; }
.mono { font-family: var(--mono); }
.wrap { max-width: var(--maxw); margin: 0 auto; padding-left: var(--gutter); padding-right: var(--gutter); }
.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { left: 12px; top: 12px; background: var(--ink); color: var(--paper); padding: 8px 14px; z-index: 99; font-family: var(--mono); font-size: 0.78rem; }

/* Eyebrow / spec label */
.label { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.22em; text-transform: uppercase; color: var(--muted); }
.label .mk { color: var(--accent); }

/* ── Masthead ──────────────────────────────────────────────── */
.masthead {
  position: sticky; top: 0; z-index: 30;
  background: rgba(241, 238, 230, 0.86);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
.masthead .bar {
  max-width: var(--maxw); margin: 0 auto; padding: 14px var(--gutter);
  display: flex; align-items: baseline; justify-content: space-between; gap: 20px;
}
.brand {
  font-family: var(--serif); font-weight: 600; font-size: 1.42rem;
  letter-spacing: -0.01em; text-decoration: none; color: var(--ink); line-height: 1; white-space: nowrap;
}
.brand .dot { color: var(--accent); }
.masthead nav { display: flex; align-items: baseline; gap: 26px; font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.02em; }
.masthead nav a { color: var(--muted); text-decoration: none; transition: color 160ms; }
.masthead nav a:hover { color: var(--ink); }
.masthead nav a.req { color: var(--accent); }
.masthead nav a.req:hover { color: var(--accent-deep); }
@media (max-width: 820px) { .masthead nav .hideable { display: none; } }

/* ── Section scaffold ──────────────────────────────────────── */
section { padding-top: clamp(70px, 9vw, 128px); }
.sechead { display: flex; align-items: baseline; gap: 14px; margin-bottom: 30px; }
.sechead .no { font-family: var(--mono); font-size: 0.82rem; color: var(--accent); font-weight: 700; }
.sechead .ti { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.24em; text-transform: uppercase; color: var(--muted); }
.sechead .rule { flex: 1; height: 1px; background: var(--rule); align-self: center; }

h2.head {
  font-family: var(--serif); font-weight: 500;
  font-size: clamp(1.9rem, 4vw, 2.9rem); line-height: 1.08; letter-spacing: -0.015em;
  margin: 0 0 18px; color: var(--ink); max-width: 22ch;
}
h2.head em { font-style: italic; color: var(--accent-deep); }
.standfirst { font-size: 1.08rem; line-height: 1.7; color: var(--ink-soft); max-width: 62ch; margin: 0; }
.standfirst strong { font-weight: 600; color: var(--ink); }
a.ln { color: var(--accent-deep); text-decoration: none; border-bottom: 1px solid var(--rule-2); transition: border-color 160ms; }
a.ln:hover { border-color: var(--accent); }

/* ── Hero (landing) ────────────────────────────────────────── */
.hero { padding-top: clamp(48px, 8vw, 92px); padding-bottom: 8px; }
.hero .dateline { margin-bottom: 26px; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.hero .dateline .seg { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); }
.hero .dateline .bar2 { width: 22px; height: 1px; background: var(--rule-2); }
h1.claim {
  font-family: var(--serif); font-weight: 500;
  font-size: clamp(2.7rem, 6.8vw, 5.4rem); line-height: 1.0; letter-spacing: -0.022em;
  margin: 0 0 26px; color: var(--ink); max-width: 16ch;
}
h1.claim .em { font-style: italic; font-weight: 500; }
h1.claim .muted { color: var(--faint); }
.hero .standfirst { font-size: 1.18rem; max-width: 54ch; }
.cta-row { margin-top: 34px; display: flex; flex-wrap: wrap; gap: 14px 26px; align-items: center; }
.btn {
  display: inline-block; font-family: var(--mono); font-size: 0.84rem; font-weight: 700; letter-spacing: 0.03em;
  color: var(--paper); background: var(--ink); text-decoration: none; padding: 13px 24px;
  transition: background 160ms, transform 160ms;
}
.btn:hover { background: var(--accent-deep); transform: translateY(-1px); }
.btn.ghost { background: transparent; color: var(--accent-deep); padding: 13px 4px; }
.btn.ghost:hover { color: var(--accent); transform: translateX(2px); }

/* ── Thesis pull-quote ─────────────────────────────────────── */
.thesis { text-align: center; }
.thesis .inner { max-width: 880px; margin: 0 auto; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); padding: clamp(44px, 7vw, 80px) 0; }
.thesis blockquote {
  margin: 0; font-family: var(--serif); font-weight: 400; font-style: italic;
  font-size: clamp(1.5rem, 3.6vw, 2.5rem); line-height: 1.28; letter-spacing: -0.01em; color: var(--ink);
}
.thesis blockquote .q { color: var(--accent-deep); }
.thesis .attrib { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); margin-top: 26px; }

/* ── Prose block ───────────────────────────────────────────── */
.prose { font-size: 1.12rem; line-height: 1.75; color: var(--ink-soft); max-width: 64ch; }
.prose strong { color: var(--ink); font-weight: 600; }
.prose .first { font-family: var(--serif); }
.prose p { margin: 0 0 18px; }
.prose p:last-child { margin-bottom: 0; }
.prose a { color: var(--accent-deep); text-decoration: none; border-bottom: 1px solid var(--rule-2); }
.prose a:hover { border-bottom-color: var(--accent); }

/* ── The stack index ───────────────────────────────────────── */
.index-lead { margin-bottom: 40px; }
.layer { margin-top: 44px; }
.layer:first-of-type { margin-top: 0; }
.layer-tag {
  display: grid; grid-template-columns: 1fr auto; align-items: baseline; gap: 16px;
  border-bottom: 1.5px solid var(--ink); padding-bottom: 9px; margin-bottom: 4px;
}
.layer-tag .nm { font-family: var(--serif); font-style: italic; font-size: 1.3rem; color: var(--ink); }
.layer-tag .ct { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--muted); }

.row {
  display: grid; grid-template-columns: 168px 1fr 132px; gap: 20px; align-items: baseline;
  padding: 16px 4px; border-bottom: 1px solid var(--rule); text-decoration: none; color: inherit;
  transition: background 150ms, padding-left 150ms;
}
a.row:hover { background: var(--accent-wash); padding-left: 12px; }
.row .code { font-family: var(--mono); font-weight: 700; font-size: 0.96rem; color: var(--accent-deep); }
a.row:hover .code { color: var(--accent); }
.row .code .arr { opacity: 0; margin-left: 8px; transition: opacity 150ms; }
a.row:hover .code .arr { opacity: 1; }
.row .desc { font-size: 0.98rem; line-height: 1.5; color: var(--ink-soft); }
.row .role { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--faint); text-align: right; }
@media (max-width: 680px) {
  .row { grid-template-columns: 1fr; gap: 5px; padding: 15px 4px; }
  .row .role { text-align: left; }
  a.row:hover { padding-left: 8px; }
}
.index-foot { margin-top: 30px; font-family: var(--mono); font-size: 0.78rem; color: var(--muted); line-height: 1.8; }
.index-foot a { color: var(--ink-soft); text-decoration: none; border-bottom: 1px solid var(--rule-2); }
.index-foot a:hover { color: var(--accent-deep); border-bottom-color: var(--accent); }

/* ── Numbered editorial list (how / capabilities) ──────────── */
.steps { border-top: 1px solid var(--rule); }
.stepi { display: grid; grid-template-columns: 64px 1fr; gap: 22px; padding: 26px 0; border-bottom: 1px solid var(--rule); align-items: start; }
.stepi .si { font-family: var(--serif); font-size: 1.7rem; color: var(--accent); line-height: 1; font-weight: 400; }
.stepi h3 { font-family: var(--sans); font-size: 1.08rem; font-weight: 600; margin: 0 0 6px; color: var(--ink); }
.stepi p { margin: 0; font-size: 0.98rem; line-height: 1.6; color: var(--ink-soft); max-width: 64ch; }
@media (max-width: 520px) { .stepi { grid-template-columns: 44px 1fr; gap: 16px; } .stepi .si { font-size: 1.3rem; } }

/* ── Proof / ledger ────────────────────────────────────────── */
.proof-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: clamp(28px, 5vw, 64px); align-items: start; }
@media (max-width: 820px) { .proof-grid { grid-template-columns: 1fr; gap: 30px; } }
.proof-note { border-left: 2px solid var(--accent); padding-left: 24px; }
.proof-note p { margin: 0; font-family: var(--serif); font-size: 1.32rem; line-height: 1.5; color: var(--ink); font-weight: 400; }
.proof-note p strong { font-weight: 600; }
.proof-note p a { color: var(--accent-deep); text-decoration: none; border-bottom: 1px solid var(--rule-2); }
.ledger { font-family: var(--mono); font-size: 0.78rem; line-height: 1; color: var(--muted); }
.ledger dl { margin: 0; display: grid; grid-template-columns: 1fr; gap: 0; }
.ledger .li { display: flex; align-items: baseline; justify-content: space-between; gap: 14px; padding: 13px 0; border-bottom: 1px solid var(--rule); }
.ledger .li:first-child { border-top: 1px solid var(--rule); }
.ledger .k { color: var(--muted); letter-spacing: 0.04em; }
.ledger .v { color: var(--ink); font-weight: 700; }

/* ── Closing / colophon ────────────────────────────────────── */
.closing { text-align: center; padding-top: clamp(80px, 11vw, 150px); padding-bottom: 20px; }
.closing .big {
  font-family: var(--serif); font-weight: 500; font-style: italic;
  font-size: clamp(2.1rem, 5.4vw, 3.6rem); line-height: 1.05; letter-spacing: -0.02em; color: var(--ink); margin: 0 0 18px;
}
.closing p { color: var(--ink-soft); font-size: 1.05rem; margin: 0 0 30px; }
.closing .go {
  display: inline-block; font-family: var(--mono); font-size: 0.86rem; font-weight: 700; letter-spacing: 0.04em;
  color: var(--paper); background: var(--ink); text-decoration: none; padding: 14px 26px;
  transition: background 160ms, transform 160ms;
}
.closing .go:hover { background: var(--accent-deep); transform: translateY(-1px); }

footer.colophon {
  margin-top: clamp(70px, 10vw, 130px); border-top: 1px solid var(--rule);
  font-family: var(--mono); font-size: 0.74rem; color: var(--muted); letter-spacing: 0.02em;
}
footer.colophon .bar {
  max-width: var(--maxw); margin: 0 auto; padding: 26px var(--gutter) 40px;
  display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 12px 24px;
}
footer.colophon a { color: var(--muted); text-decoration: none; transition: color 160ms; }
footer.colophon a:hover { color: var(--accent-deep); }
footer.colophon .set { color: var(--faint); }
footer.colophon .links a { margin-left: 18px; }
@media (max-width: 620px) { footer.colophon .links a { margin: 0 18px 0 0; } }

/* ════════════════════════════════════════════════════════════
   Product page
   ════════════════════════════════════════════════════════════ */

/* breadcrumb */
.crumb { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.04em; color: var(--muted); padding-top: clamp(34px, 6vw, 64px); }
.crumb a { color: var(--muted); text-decoration: none; border-bottom: 1px solid transparent; }
.crumb a:hover { color: var(--accent-deep); border-bottom-color: var(--accent); }
.crumb .sep { color: var(--faint); margin: 0 8px; }

/* product hero */
.phero { padding-top: clamp(26px, 4vw, 44px); }
.phero .own { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--accent); margin: 0 0 16px; }
.phero h1 {
  font-family: var(--mono); font-weight: 700; font-size: clamp(2.6rem, 7vw, 4.6rem);
  line-height: 1; letter-spacing: -0.03em; color: var(--ink); margin: 0 0 22px;
}
.phero .lead { font-family: var(--serif); font-weight: 400; font-size: clamp(1.3rem, 2.6vw, 1.8rem); line-height: 1.4; color: var(--ink-soft); max-width: 30ch; margin: 0; }
.phero .lead em { font-style: italic; color: var(--accent-deep); }

/* spec rail — links / facts under the hero */
.spec { margin-top: 36px; display: flex; flex-wrap: wrap; gap: 10px 14px; align-items: center; }
.spec .pill {
  font-family: var(--mono); font-size: 0.76rem; letter-spacing: 0.02em; text-decoration: none;
  color: var(--ink); border: 1px solid var(--rule-2); padding: 9px 15px; transition: border-color 150ms, color 150ms, background 150ms;
}
.spec a.pill:hover { border-color: var(--accent); color: var(--accent-deep); background: var(--accent-wash); }
.spec .pill.tag { color: var(--muted); border-style: dashed; }

/* divider rule used between product sections */
hr.div { border: 0; border-top: 1px solid var(--rule); margin: 0; }

/* install / code plate */
figure.plate { margin: 0; }
.plate .frame { background: var(--paper-2); border: 1px solid var(--rule-2); box-shadow: 6px 6px 0 -1px var(--rule); }
.plate .frame-top {
  display: flex; align-items: center; justify-content: space-between;
  padding: 9px 13px; border-bottom: 1px solid var(--rule);
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.04em; color: var(--muted);
}
.plate .frame-top .dot3 { display: inline-flex; gap: 6px; }
.plate .frame-top .dot3 i { width: 8px; height: 8px; border-radius: 50%; background: var(--rule-2); display: inline-block; }
.plate pre {
  margin: 0; padding: 18px 18px 20px; font-family: var(--mono); font-size: 0.82rem; line-height: 1.85;
  color: var(--ink-soft); white-space: pre-wrap; word-break: break-word; overflow-x: auto;
}
.plate pre .c { color: var(--faint); }            /* comment */
.plate pre .p { color: var(--accent); }            /* prompt $ */
.plate pre .k { color: var(--accent-deep); font-weight: 700; }  /* keyword/command */
.plate pre .o { color: var(--ok); font-weight: 700; }           /* ok / output */
.plate figcaption { font-family: var(--mono); font-size: 0.68rem; color: var(--muted); margin-top: 12px; letter-spacing: 0.02em; }

/* two-column product body */
.pgrid { display: grid; grid-template-columns: 1.25fr 0.75fr; gap: clamp(28px, 5vw, 60px); align-items: start; }
@media (max-width: 860px) { .pgrid { grid-template-columns: 1fr; gap: 34px; } }

/* feature list (definition rows) */
.feats { border-top: 1px solid var(--rule); }
.feat { padding: 22px 0; border-bottom: 1px solid var(--rule); }
.feat h3 { font-family: var(--serif); font-weight: 500; font-size: 1.22rem; color: var(--ink); margin: 0 0 7px; }
.feat p { margin: 0; font-size: 1rem; line-height: 1.65; color: var(--ink-soft); max-width: 70ch; }

/* sibling nav — where it sits in the stack */
.siblings { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
.sib { display: block; border: 1px solid var(--rule); padding: 18px 20px; text-decoration: none; color: inherit; transition: border-color 160ms, transform 160ms, background 160ms; }
.sib:hover { border-color: var(--accent); transform: translateY(-2px); background: var(--accent-wash); }
.sib .sc { font-family: var(--mono); font-weight: 700; font-size: 0.92rem; color: var(--accent-deep); }
.sib .sd { font-size: 0.9rem; line-height: 1.5; color: var(--ink-soft); margin: 6px 0 0; }

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }