/* ── Kopilot — the counter-signature world ──────────────────────────────────
   Security-printing / dual-control instrument language on light paper.
   Faces: Besley (display, Clarendon lineage), Public Sans (text/UI),
   JetBrains Mono (code, serials). All self-hosted. Light theme, committed. */

@font-face {
  font-family: 'Besley';
  src: url('/assets/fonts/besley-latin-wght-normal.woff2') format('woff2-variations');
  font-weight: 400 900; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'Besley';
  src: url('/assets/fonts/besley-latin-wght-italic.woff2') format('woff2-variations');
  font-weight: 400 900; font-style: italic; font-display: swap;
}
@font-face {
  font-family: 'Public Sans';
  src: url('/assets/fonts/public-sans-latin-wght-normal.woff2') format('woff2-variations');
  font-weight: 100 900; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'Public Sans';
  src: url('/assets/fonts/public-sans-latin-wght-italic.woff2') format('woff2-variations');
  font-weight: 100 900; font-style: italic; font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono';
  src: url('/assets/fonts/jetbrains-mono-latin-wght-normal.woff2') format('woff2-variations');
  font-weight: 100 800; font-style: normal; font-display: swap;
}

:root {
  --paper: #FAF8F1;
  --paper-deep: #F2EFE4;
  --tint: #E9EFE2;
  --ink: #1B2A21;
  --ink-soft: #44564A;
  --line: #D8DBC9;
  --line-strong: #B9BFA9;
  --green: #175C43;
  --green-deep: #0E4433;
  --green-wash: #E3ECE2;
  --gilt: #8A6212;
  --gilt-wash: #F4ECD9;
  --danger: #8C2B1E;
  --plate: #12201A;
  --plate-ink: #C6D9CB;
  --plate-dim: #7E9787;
  --plate-line: #24382E;

  --font-display: 'Besley', 'Iowan Old Style', Georgia, serif;
  --font-text: 'Public Sans', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  --w: 1128px;
  --radius: 3px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-text);
  font-size: 1.0625rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--green); color: #fff; }

a { color: var(--green); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--green-deep); }
:focus-visible { outline: 2px solid var(--green); outline-offset: 3px; border-radius: 2px; }

h1, h2, h3 { font-family: var(--font-display); line-height: 1.12; text-wrap: balance; margin: 0; }
h1 { font-weight: 650; font-size: clamp(2.15rem, 5.4vw, 4.05rem); letter-spacing: -0.015em; overflow-wrap: break-word; }
h2 { font-weight: 620; font-size: clamp(1.7rem, 3vw, 2.35rem); letter-spacing: -0.01em; }
h3 { font-family: var(--font-text); font-weight: 660; font-size: 1.09rem; letter-spacing: 0.002em; }
p { margin: 0; }

code, pre { font-family: var(--font-mono); }
code { font-size: 0.885em; background: var(--paper-deep); border: 1px solid var(--line); border-radius: var(--radius); padding: 0.1em 0.38em; }
pre { margin: 0; overflow-x: auto; }
pre code { background: none; border: 0; padding: 0; font-size: 0.86rem; line-height: 1.65; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--ink); color: var(--paper); padding: 0.6rem 1rem; border-radius: 0 0 var(--radius) var(--radius);
}
.skip-link:focus { left: 1rem; }

.wrap { max-width: var(--w); margin-inline: auto; padding-inline: clamp(1.1rem, 4vw, 2rem); }

/* ── Header ── */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-block: 0.8rem; }
.brand { display: inline-flex; align-items: center; gap: 0.6rem; text-decoration: none; color: var(--ink); }
.brand svg { width: 27px; height: 27px; display: block; }
.brand span { font-family: var(--font-display); font-weight: 680; font-size: 1.22rem; letter-spacing: 0.002em; }
.nav-links { display: flex; align-items: center; gap: 1.7rem; }
.nav-links a { color: var(--ink-soft); text-decoration: none; font-weight: 520; font-size: 0.96rem; }
.nav-links a:hover, .nav-links a[aria-current] { color: var(--green-deep); }
.nav-links .nav-cta {
  color: var(--paper); background: var(--green); padding: 0.42rem 0.95rem; border-radius: var(--radius);
  border: 1px solid var(--green-deep); font-weight: 560;
}
.nav-links .nav-cta:hover { background: var(--green-deep); color: #fff; }
.nav-toggle { display: none; }

/* ── Certificate frame (the hero instrument) ── */
.hero-outer { padding-block: clamp(1.6rem, 4vw, 3.2rem) clamp(2.4rem, 5vw, 4rem); }
.certificate {
  position: relative;
  border: 1.5px solid var(--line-strong);
  outline: 1px solid var(--line);
  outline-offset: 5px;
  background:
    radial-gradient(90rem 40rem at 85% -10%, var(--tint), transparent 55%),
    var(--paper);
  padding: clamp(1.6rem, 4.5vw, 3.6rem);
  overflow: hidden;
}
.certificate::before, .certificate::after {
  content: ""; position: absolute; width: 124px; height: 124px; color: var(--line-strong);
  background: url('/assets/art/corner.svg') no-repeat center / contain; opacity: 0.55; pointer-events: none;
}
.certificate::before { top: 9px; left: 9px; }
.certificate::after { bottom: 9px; right: 9px; transform: rotate(180deg); }
.cert-band {
  position: absolute; inset-inline: 0; top: 0; height: 34px; color: var(--line-strong);
  background: url('/assets/art/band.svg') repeat-x center / auto 34px; opacity: 0.55; pointer-events: none;
}
.cert-rosette {
  position: absolute; right: -110px; bottom: -140px; width: 400px; height: 400px; color: var(--line-strong);
  background: url('/assets/art/rosette.svg') no-repeat center / contain; opacity: 0.16; pointer-events: none;
}

.hero-grid {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(1.8rem, 4vw, 3.4rem); align-items: center;
  padding-top: 1.4rem;
}
.hero-copy .doc-rule {
  display: flex; align-items: baseline; gap: 0.9rem; margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--line); padding-bottom: 0.55rem;
  font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.14em; color: var(--ink-soft);
}
.doc-rule strong { color: var(--green-deep); font-weight: 620; }
.hero-copy h1 em { font-style: italic; color: var(--green-deep); }
.hero-copy .lede {
  margin-top: 1.35rem; font-size: 1.16rem; line-height: 1.72; color: var(--ink-soft); max-width: 33.5em;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.85rem; margin-top: 2rem; }

.btn {
  display: inline-flex; align-items: center; gap: 0.55rem;
  font-weight: 570; font-size: 0.99rem; text-decoration: none;
  padding: 0.68rem 1.35rem; border-radius: var(--radius);
  border: 1px solid transparent; transition: background 140ms ease-out, transform 140ms ease-out, box-shadow 140ms ease-out;
}
.btn-primary { background: var(--green); color: #fff; border-color: var(--green-deep); box-shadow: 0 1px 2px rgba(20, 40, 30, 0.25); }
.btn-primary:hover { background: var(--green-deep); color: #fff; transform: translateY(-1px); box-shadow: 0 3px 9px rgba(20, 40, 30, 0.22); }
.btn-quiet { border-color: var(--line-strong); color: var(--ink); background: transparent; }
.btn-quiet:hover { border-color: var(--ink-soft); color: var(--ink); background: var(--paper-deep); }
.btn svg { width: 17px; height: 17px; }

/* ── Approval stub (hero object) ── */
.stub {
  position: relative;
  background: #FFFEF9;
  border: 1px solid var(--line-strong);
  box-shadow: 0 14px 34px -18px rgba(24, 40, 30, 0.35), 0 2px 8px rgba(24, 40, 30, 0.08);
  padding: 1.35rem 1.5rem 1.2rem;
  max-width: 26.5rem; margin-left: auto;
}
.stub::before {
  content: ""; position: absolute; inset: 6px; border: 1px solid var(--line); pointer-events: none;
}
.stub-head {
  display: flex; justify-content: space-between; align-items: baseline; gap: 1rem;
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.16em; color: var(--ink-soft);
  padding-bottom: 0.8rem; border-bottom: 1px solid var(--line); margin-bottom: 1rem;
}
.stub-head b { color: var(--ink); font-weight: 620; }
.stub-cmd {
  font-family: var(--font-mono); font-size: 0.8rem; line-height: 1.6; color: var(--ink);
  background: var(--paper-deep); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 0.65rem 0.8rem; white-space: pre-wrap; word-break: break-word;
}
.stub-meta { display: flex; gap: 0.5rem; align-items: center; margin-top: 0.9rem; flex-wrap: wrap; padding-right: 5.4rem; }
.stamp {
  font-family: var(--font-mono); font-size: 0.68rem; font-weight: 640; letter-spacing: 0.13em;
  padding: 0.24rem 0.55rem; border-radius: 2px; border: 1.5px solid currentColor;
}
.stamp-risk { color: var(--gilt); background: var(--gilt-wash); transform: rotate(-1.4deg); }
.stamp-scope { color: var(--ink-soft); background: var(--paper-deep); border-width: 1px; }
.stub-sig { position: relative; margin-top: 1.7rem; padding-top: 2rem; }
.stub-sig .sig-line { border-top: 1px solid var(--ink-soft); position: relative; }
.stub-sig .sig-label {
  display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 0.3rem;
  padding-right: 5.6rem;
  font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.14em; color: var(--ink-soft); margin-top: 0.4rem;
}
.sig-name {
  position: absolute; left: 0.5rem; top: 0.15rem;
  font-family: var(--font-display); font-style: italic; font-weight: 540; font-size: 1.35rem; color: var(--green-deep);
  animation: sig-in 700ms 900ms cubic-bezier(0.2, 0.9, 0.25, 1) both;
}
.stub-seal {
  position: absolute; right: 0; bottom: 0.2rem; width: 86px; height: 86px; color: var(--green);
  display: grid; place-content: center; text-align: center;
  border: 1.5px solid var(--green); border-radius: 50%;
  background: url('/assets/art/rosette.svg') no-repeat center / 300%, var(--green-wash);
  box-shadow: inset 0 0 0 3px var(--paper), 0 1px 3px rgba(23, 92, 67, 0.18);
  animation: seal-in 520ms 1250ms cubic-bezier(0.34, 1.4, 0.5, 1) both;
}
.stub-seal span {
  font-family: var(--font-mono); font-size: 0.47rem; font-weight: 700; letter-spacing: 0.14em;
  line-height: 1.5; color: var(--green-deep);
}
@keyframes sig-in { from { opacity: 0; transform: translateX(-14px); } to { opacity: 1; transform: none; } }
@keyframes seal-in { from { opacity: 0; transform: scale(1.5) rotate(-14deg); } to { opacity: 1; transform: scale(1) rotate(-8deg); } }
.stub-note { margin-top: 1.35rem; padding-right: 5.6rem; font-size: 0.83rem; color: var(--ink-soft); line-height: 1.55; }

.microprint {
  margin-top: 0.9rem; overflow: hidden; white-space: nowrap;
  font-family: var(--font-mono); font-size: 0.44rem; letter-spacing: 0.34em; color: var(--line-strong);
  user-select: none;
}

/* ── Sections ── */
.section { padding-block: clamp(3rem, 7vw, 5.2rem); }
.section-tinted { background: linear-gradient(var(--paper-deep), var(--paper)); border-block: 1px solid var(--line); }
.section-head { max-width: 44em; margin-bottom: clamp(1.8rem, 4vw, 2.8rem); }
.section-head p { margin-top: 0.9rem; color: var(--ink-soft); font-size: 1.08rem; }

/* Ledger steps (real sequence) */
.ledger { border: 1px solid var(--line-strong); background: #FFFEF9; }
.ledger-row {
  display: grid; grid-template-columns: 4.4rem minmax(0, 15rem) 1fr; gap: 1.4rem; align-items: start;
  padding: 1.35rem 1.6rem; border-top: 1px solid var(--line);
}
.ledger-row:first-child { border-top: 0; }
.ledger-no {
  font-family: var(--font-display); font-weight: 620; font-size: 1.9rem; color: var(--line-strong);
  font-variant-numeric: tabular-nums; line-height: 1;
}
.ledger-row h3 { padding-top: 0.2rem; }
.ledger-row p { color: var(--ink-soft); font-size: 0.99rem; }
.ledger-row p code { font-size: 0.84em; }

/* Terminal — the working papers */
.papers {
  background: var(--plate); color: var(--plate-ink);
  border-radius: 6px; border: 1px solid var(--plate-line);
  box-shadow: 0 24px 48px -24px rgba(18, 32, 26, 0.5);
  overflow: hidden;
}
.papers-head {
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  padding: 0.7rem 1.2rem; border-bottom: 1px solid var(--plate-line);
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.14em; color: var(--plate-dim);
}
.papers pre { padding: 1.3rem 1.4rem 1.5rem; font-size: 0.855rem; line-height: 1.68; }
.papers .t-cmd { color: #EAF4EC; font-weight: 560; }
.papers .t-skill { color: #8CC7A5; }
.papers .t-dim { color: var(--plate-dim); }
.papers .t-warn { color: #D8B25E; }
.papers .t-head { color: #A9C4B2; font-weight: 560; }
.transcript-label {
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.15em; color: var(--ink-soft); margin-bottom: 0.8rem;
}

/* Pipeline schematic */
.schematic { border: 1px solid var(--line-strong); background: #FFFEF9; padding: clamp(1.2rem, 3vw, 2.2rem); overflow-x: auto; }
.schematic svg { display: block; min-width: 780px; width: 100%; height: auto; }

/* Powers schedule (features as a certificate schedule, not card grid) */
.schedule { border: 1px solid var(--line-strong); background: #FFFEF9; }
.schedule-row {
  display: grid; grid-template-columns: minmax(0, 17rem) 1fr; gap: 1.6rem;
  padding: 1.5rem 1.7rem; border-top: 1px solid var(--line); align-items: start;
}
.schedule-row:first-child { border-top: 0; }
.schedule-row .power { display: flex; gap: 0.85rem; align-items: flex-start; }
.schedule-row .power svg { width: 24px; height: 24px; flex: none; color: var(--green); margin-top: 0.1rem; }
.schedule-row p { color: var(--ink-soft); font-size: 0.99rem; max-width: 56em; }
.schedule-row p code { font-size: 0.84em; }

/* Providers strip */
.chips { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.chip {
  font-family: var(--font-mono); font-size: 0.8rem; letter-spacing: 0.05em;
  border: 1px solid var(--line-strong); background: #FFFEF9; color: var(--ink);
  padding: 0.34rem 0.8rem; border-radius: 999px;
}
.chip b { color: var(--green-deep); font-weight: 620; }

/* Install */
.issue-grid { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(1.6rem, 4vw, 3rem); align-items: start; }
.issue-grid > *, .hero-grid > *, .ledger-row > *, .schedule-row > * { min-width: 0; }
.codeblock {
  background: var(--plate); color: var(--plate-ink); border-radius: 6px; border: 1px solid var(--plate-line);
  padding: 1.15rem 1.3rem; position: relative;
}
.codeblock pre { font-size: 0.87rem; }
.codeblock .t-dim { color: var(--plate-dim); }
.copy-btn {
  position: absolute; top: 0.6rem; right: 0.6rem;
  font: 560 0.72rem var(--font-text); letter-spacing: 0.04em;
  color: var(--plate-dim); background: transparent; border: 1px solid var(--plate-line); border-radius: 3px;
  padding: 0.25rem 0.6rem; cursor: pointer; transition: color 120ms, border-color 120ms;
}
.copy-btn:hover { color: var(--plate-ink); border-color: var(--plate-dim); }
.issue-notes { display: grid; gap: 1rem; color: var(--ink-soft); font-size: 0.99rem; }
.issue-notes b { color: var(--ink); font-weight: 620; }

/* Honest-limits aside */
.provision {
  border: 1px solid var(--line-strong); background: var(--gilt-wash);
  padding: 1.2rem 1.5rem; margin-top: 2rem; max-width: 60em;
  font-size: 0.97rem; color: var(--ink); line-height: 1.65;
}
.provision b { font-weight: 640; }
.provision a { color: var(--green-deep); }

/* Closing */
.close-cta { text-align: center; padding-block: clamp(3.4rem, 8vw, 6rem); position: relative; overflow: hidden; }
.close-cta .cert-band { top: auto; bottom: 0; opacity: 0.4; }
.close-cta h2 { font-size: clamp(1.9rem, 3.6vw, 2.7rem); }
.close-cta p { margin: 1rem auto 1.8rem; color: var(--ink-soft); max-width: 36em; }
.close-cta .hero-actions { justify-content: center; }

.site-footer { border-top: 1px solid var(--line); padding-block: 2.2rem 2.6rem; }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; color: var(--ink-soft); font-size: 0.93rem; }
.footer-inner a { color: var(--ink-soft); }
.footer-inner a:hover { color: var(--green-deep); }

/* ── Docs shell ── */
.docs-layout { display: grid; grid-template-columns: 15.5rem minmax(0, 1fr); gap: clamp(2rem, 5vw, 4rem); padding-block: 2.6rem 4.5rem; }
.docs-sidebar { position: sticky; top: 4.6rem; align-self: start; font-size: 0.94rem; }
.docs-sidebar .group {
  font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.16em; color: var(--ink-soft);
  margin: 1.5rem 0 0.5rem; padding-bottom: 0.3rem; border-bottom: 1px solid var(--line);
}
.docs-sidebar .group:first-child { margin-top: 0; }
.docs-sidebar a { display: block; color: var(--ink-soft); text-decoration: none; padding: 0.28rem 0.5rem; border-radius: var(--radius); }
.docs-sidebar a:hover { color: var(--green-deep); background: var(--paper-deep); }
.docs-sidebar a[aria-current] { color: var(--green-deep); background: var(--green-wash); font-weight: 570; }
.docs-content { max-width: 44rem; }
.docs-content > h1 { font-size: clamp(2rem, 3.4vw, 2.7rem); }
.docs-content > .lead {
  margin-top: 0.9rem; padding-bottom: 1.5rem; color: var(--ink-soft); font-size: 1.09rem;
  border-bottom: 1px solid var(--line-strong); position: relative;
}
.docs-content > .lead::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 2px; height: 9px; color: var(--line);
  background: url('/assets/art/band.svg') repeat-x center / auto 9px; opacity: 0.85; pointer-events: none;
}
.docs-content > h1 + .lead { margin-bottom: 2.1rem; }
.docs-content h2 { font-size: 1.46rem; margin: 2.7rem 0 0.85rem; }
.docs-content h2 + p, .docs-content h3 + p { margin-top: 0; }
.docs-content h3 { margin: 1.9rem 0 0.6rem; }
.docs-content p, .docs-content li { color: var(--ink-soft); }
.docs-content p + p { margin-top: 0.9rem; }
.docs-content strong { color: var(--ink); }
.docs-content ul, .docs-content ol { padding-left: 1.3rem; margin: 0.8rem 0; }
.docs-content li { margin-block: 0.3rem; }
.docs-content pre:not(.transcript) {
  background: var(--plate); color: var(--plate-ink); border-radius: 6px; border: 1px solid var(--plate-line);
  padding: 1rem 1.2rem; margin: 1rem 0; position: relative;
}
.docs-content .table-wrap { overflow-x: auto; margin: 1.1rem 0; border: 1px solid var(--line-strong); background: #FFFEF9; }
.docs-content table { border-collapse: collapse; width: 100%; font-size: 0.92rem; }
.docs-content th, .docs-content td { text-align: left; padding: 0.6rem 0.9rem; border-top: 1px solid var(--line); vertical-align: top; }
.docs-content thead th {
  border-top: 0; font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.13em;
  color: var(--ink-soft); font-weight: 600; background: var(--paper-deep);
}
.docs-content td { color: var(--ink-soft); font-variant-numeric: tabular-nums; }
.docs-content td:first-child { color: var(--ink); }
.warn, .note {
  border: 1px solid var(--line-strong); padding: 0.95rem 1.2rem; margin: 1.2rem 0; font-size: 0.96rem;
}
.warn { background: var(--gilt-wash); }
.note { background: var(--green-wash); }
.warn p, .note p { color: var(--ink); }

/* ── Responsive ── */
@media (max-width: 920px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr); }
  .stub { margin-left: 0; }
  .cert-rosette { display: none; }
  .issue-grid { grid-template-columns: minmax(0, 1fr); }
  .schedule-row { grid-template-columns: minmax(0, 1fr); gap: 0.5rem; }
  .ledger-row { grid-template-columns: 3rem minmax(0, 1fr); }
  .ledger-row p { grid-column: 2; }
  .docs-layout { grid-template-columns: minmax(0, 1fr); }
  .docs-sidebar { position: static; border: 1px solid var(--line-strong); background: #FFFEF9; padding: 1rem 1.2rem; }
}
@media (max-width: 720px) {
  .nav-toggle {
    display: inline-flex; background: none; border: 1px solid var(--line-strong); border-radius: var(--radius);
    font: 560 0.9rem var(--font-text); color: var(--ink); padding: 0.35rem 0.8rem; cursor: pointer;
  }
  .nav-links {
    display: none; position: absolute; top: 100%; right: clamp(1.1rem, 4vw, 2rem);
    flex-direction: column; align-items: stretch; gap: 0.15rem;
    background: #FFFEF9; border: 1px solid var(--line-strong); border-radius: var(--radius);
    padding: 0.5rem; min-width: 12rem; box-shadow: 0 12px 28px -12px rgba(24, 40, 30, 0.3);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 0.5rem 0.7rem; }
  .certificate { outline: none; }
  .certificate::before, .certificate::after { width: 110px; height: 110px; }
}