/* Redesign concept — visual language after digitalasset.com (July 2026):
   near-black ground, pale-lemon accent, pill buttons, grotesk type.
   Fictional branding (LedgerLab) throughout. */

:root {
  --ink: #0e0e0e;
  --paper: #f9faf5;
  --paper-dim: rgba(249, 250, 245, 0.72);
  --accent: #f2f9a9;
  --accent-ink: #5d6410;
  --blue: #a3cffc;
  --light-bg: #f4f4f1;
  --light-bg-alt: #ecece7;
  --line-dark: rgba(249, 250, 245, 0.18);
  --line-light: rgba(14, 14, 14, 0.14);
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: auto; }
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}
.light :focus-visible { outline-color: var(--ink); }

h1, h2, h3, h4 { font-weight: 600; letter-spacing: -0.015em; margin: 0 0 0.5em; }
h1 { font-size: clamp(34px, 5vw, 56px); line-height: 1.08; }
h2 { font-size: clamp(26px, 3.4vw, 36px); }
h3 { font-size: 19px; }
h1 em, h2 em { font-style: normal; color: var(--accent); }

.mono { font-family: var(--mono); font-size: 0.92em; }
.time {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 400;
  vertical-align: middle;
  margin-left: 10px;
  padding: 3px 10px;
  border: 1px solid currentColor;
  border-radius: 100px;
  opacity: 0.65;
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(14, 14, 14, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line-dark);
}
.header-row { display: flex; align-items: center; gap: 16px; padding: 14px 24px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.mark {
  width: 22px; height: 22px;
  background:
    linear-gradient(135deg, var(--accent) 0 50%, transparent 50%),
    linear-gradient(315deg, var(--paper) 0 38%, transparent 38%);
  border-radius: 4px;
}
.wordmark { font-weight: 700; font-size: 18px; letter-spacing: -0.02em; }
.concept-badge {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  border: 1px dashed rgba(242, 249, 169, 0.5);
  border-radius: 100px;
  padding: 4px 10px;
  white-space: nowrap;
}
.site-nav { margin-left: auto; display: flex; gap: 22px; }
.site-nav a { text-decoration: none; font-size: 15px; color: var(--paper-dim); }
.site-nav a:hover { color: var(--paper); }

/* ---------- pills ---------- */
.pill {
  display: inline-block;
  font: inherit;
  font-size: 15px;
  padding: 10px 22px;
  border-radius: 100px;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid rgba(249, 250, 245, 0.25);
  background: rgba(249, 250, 245, 0.1);
  color: var(--paper);
}
.pill:hover { background: rgba(249, 250, 245, 0.18); }
.pill-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--ink);
  font-weight: 600;
}
.pill-primary:hover { background: #f7fcc4; }
@media (prefers-reduced-motion: no-preference) {
  .pill { transition: background 0.15s ease; }
}

/* ---------- hero ---------- */
.hero { position: relative; overflow: hidden; padding: 96px 0 88px; }
.rays {
  position: absolute;
  top: -140px; right: -160px;
  width: 640px; height: 640px;
  background: repeating-conic-gradient(
    from 200deg at 100% 0%,
    rgba(242, 249, 169, 0.22) 0deg 1deg,
    transparent 1deg 4.4deg
  );
  mask-image: radial-gradient(circle at 100% 0%, #000 30%, transparent 72%);
  -webkit-mask-image: radial-gradient(circle at 100% 0%, #000 30%, transparent 72%);
  pointer-events: none;
}
.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
  margin: 0 0 18px;
}
.hero .sub { max-width: 560px; color: var(--paper-dim); font-size: 18px; }
.cta-row { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 30px; }

/* ---------- sections ---------- */
section { position: relative; }
.light { background: var(--light-bg); color: var(--ink); padding: 72px 0; }
.light.alt { background: var(--light-bg-alt); }
.light p { color: rgba(14, 14, 14, 0.78); }
.dark-section { padding: 72px 0; }
.dark-section > .wrap > p { color: var(--paper-dim); max-width: 640px; }

.step { margin: 34px 0; }
.step-n {
  display: inline-grid;
  place-items: center;
  width: 26px; height: 26px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 13px;
}
.hint { font-size: 14.5px; opacity: 0.75; margin-top: 8px; }

/* ---------- code ---------- */
.codeblock {
  position: relative;
  background: var(--ink);
  color: var(--paper);
  border-radius: 10px;
  margin: 14px 0;
}
.codeblock pre {
  margin: 0;
  padding: 16px 18px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 14.5px;
  line-height: 1.6;
}
.codeblock.on-dark { border: 1px solid var(--line-dark); }
.copy-btn {
  position: absolute;
  top: 8px; right: 8px;
  font: 12px var(--mono);
  color: var(--paper-dim);
  background: rgba(249, 250, 245, 0.08);
  border: 1px solid var(--line-dark);
  border-radius: 100px;
  padding: 4px 12px;
  cursor: pointer;
}
.copy-btn:hover { color: var(--ink); background: var(--accent); border-color: var(--accent); }

.terminal {
  background: #060606;
  border: 1px solid var(--line-dark);
  border-radius: 10px;
  margin: 14px 0 26px;
}
.terminal pre {
  margin: 0;
  padding: 18px 20px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.7;
  color: #d8dcd0;
}
.terminal b { color: var(--accent); font-weight: 700; }
.terminal .dim { opacity: 0.55; }
.expected-h { margin-top: 34px; }

/* ---------- gotchas ---------- */
.gotchas { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 22px 0; }
.gotcha {
  background: rgba(14, 14, 14, 0.05);
  border: 1px solid var(--line-light);
  border-left: 4px solid var(--accent-ink);
  border-radius: 8px;
  padding: 16px 18px;
}
.gotcha h4 { font-family: var(--mono); font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent-ink); }
.gotcha p { margin: 0; font-size: 15px; }

/* ---------- party cards ---------- */
.party-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 30px 0; }
.party-card {
  border: 1px solid var(--line-dark);
  border-radius: 12px;
  padding: 22px;
  background: rgba(249, 250, 245, 0.04);
}
.party-title { font-weight: 650; font-size: 17px; letter-spacing: -0.01em; }
.party-login { font-family: var(--mono); font-size: 12.5px; color: var(--blue); font-weight: 400; white-space: nowrap; }
.party-card .party-sub { margin: 4px 0 0; font-size: 13.5px; color: var(--paper-dim); }
.party-count { font-size: 44px; font-weight: 650; letter-spacing: -0.03em; margin: 6px 0 10px; }
.party-count em { font-style: normal; color: var(--accent); }
.party-count span { font-size: 18px; color: var(--paper-dim); }
.party-card p { margin: 0; font-size: 15px; color: var(--paper-dim); }

/* ---------- troubleshooting ---------- */
.trouble { margin: 26px 0 0; display: grid; gap: 18px; }
.trouble dt { font-weight: 600; }
.trouble dd { margin: 6px 0 0; font-size: 15.5px; color: rgba(14, 14, 14, 0.75); }
.trouble > div { border-top: 1px solid var(--line-light); padding-top: 16px; }

/* ---------- principles ---------- */
#principles { border-top: 1px solid var(--line-dark); }
.principle-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 30px; }
.p-card {
  border: 1px solid var(--line-dark);
  border-radius: 12px;
  padding: 20px;
  background: rgba(249, 250, 245, 0.04);
}
.p-card h3 { font-size: 16.5px; color: var(--accent); }
.p-card p { margin: 0; font-size: 14.5px; color: var(--paper-dim); }

/* ---------- deep dive mapping ---------- */
.map-list { list-style: none; margin: 30px 0 8px; padding: 0; counter-reset: map; }
.map-row {
  display: grid;
  grid-template-columns: 1fr 44px 1fr;
  align-items: stretch;
  margin: 0 0 18px;
  counter-increment: map;
}
.map-lab, .map-std {
  border: 1px solid var(--line-light);
  border-radius: 12px;
  padding: 18px 20px;
}
.map-lab { background: #fbfbf8; }
.map-std { background: rgba(242, 249, 169, 0.26); border-color: rgba(93, 100, 16, 0.35); }
.map-lab h3, .map-std h3 { font-size: 15.5px; margin-bottom: 8px; }
.map-std h3 { color: var(--accent-ink); }
.map-lab h3::before {
  content: counter(map);
  display: inline-grid;
  place-items: center;
  width: 22px; height: 22px;
  margin-right: 9px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--accent);
  font: 400 12px var(--mono);
}
.map-lab p, .map-std p { margin: 0; font-size: 14.5px; }
.map-std a {
  display: inline-block;
  margin-top: 10px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--accent-ink);
}
.map-arrow { display: grid; place-items: center; font-size: 20px; color: var(--accent-ink); }
.read-order-h { margin-top: 38px; }
.read-order { margin: 10px 0 26px; padding-left: 24px; }
.read-order li { margin: 8px 0; font-size: 15.5px; }
.read-order a { color: var(--accent-ink); font-weight: 600; }

/* ---------- terminology ---------- */
.overview-fig { margin: 28px 0 8px; overflow-x: auto; }
.overview-fig svg { display: block; width: 100%; min-width: 680px; height: auto; }
.overview-fig figcaption { font-size: 13px; color: var(--paper-dim); margin-top: 10px; max-width: 640px; }
.terms-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-top: 36px; }
.terms-head h3 { margin: 0; }
.term-group { margin-top: 26px; }
.group-title { font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--blue); margin: 0 0 12px; }
.term-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.term {
  border: 1px solid var(--line-dark);
  border-radius: 10px;
  padding: 14px 16px;
  background: rgba(249, 250, 245, 0.04);
}
.term h5 { font-size: 15px; margin: 0 0 6px; color: var(--paper); }
.term .def { margin: 0; font-size: 14px; color: var(--paper-dim); }
.term .anchor { display: block; margin-top: 8px; font-family: var(--mono); font-size: 12px; color: var(--blue); }
#terms.quiz .term { cursor: pointer; }
#terms.quiz .term h5::after { content: " ?"; color: var(--accent); }
#terms.quiz .term .def { visibility: hidden; }
#terms.quiz .term.revealed .def { visibility: visible; }
#terms.quiz .term.revealed h5::after { content: ""; }
body.rationale #quiz-toggle { background: rgba(249, 250, 245, 0.1); }
#terms.quiz #quiz-toggle { background: var(--accent); border-color: var(--accent); color: var(--ink); font-weight: 600; }

/* ---------- callouts (design rationale layer) ---------- */
.callout {
  display: none;
  margin: 26px auto 0;
  max-width: 1012px;
  gap: 14px;
  align-items: flex-start;
  border: 1.5px dashed var(--accent-ink);
  background: rgba(242, 249, 169, 0.28);
  color: var(--ink);
  border-radius: 12px;
  padding: 16px 18px;
  font-size: 15px;
}
.dark-section .callout, .hero .callout {
  border-color: var(--accent);
  background: rgba(242, 249, 169, 0.1);
  color: var(--paper);
}
body.rationale .callout { display: flex; }
.callout-n {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 26px; height: 26px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--ink);
  font: 700 13px var(--mono);
}
.hero .callout, .light .callout { margin-left: 24px; margin-right: 24px; }
@media (min-width: 1080px) {
  .hero .callout, .light .callout, .dark-section .callout { margin-left: auto; margin-right: auto; }
}
body.rationale #rationale-toggle { background: var(--accent); border-color: var(--accent); color: var(--ink); font-weight: 600; }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--line-dark);
  padding: 40px 0 48px;
  font-size: 14px;
  color: var(--paper-dim);
}
.site-footer a { color: var(--paper); }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .site-nav { display: none; }
  .gotchas, .party-cards { grid-template-columns: 1fr; }
  .principle-cards { grid-template-columns: 1fr 1fr; }
  .hero { padding: 64px 0 56px; }
  .map-row { grid-template-columns: 1fr; }
  .map-arrow { padding: 6px 0; transform: rotate(90deg); }
  .term-grid { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .concept-badge { display: none; }
  .principle-cards { grid-template-columns: 1fr; }
  body { font-size: 16px; }
}