/* INJ RFQ MM Docs — shared styles
 * Editorial fintech aesthetic. Light + dark. Single amber accent.
 */

:root {
  /* Typography */
  --font-sans: "Inter Tight", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-serif: "Instrument Serif", "Iowan Old Style", Georgia, serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* Scale */
  --tracking-tight: -0.02em;
  --tracking-tighter: -0.035em;
  --tracking-mono: -0.01em;

  /* Light (default) — warm near-white, deep ink */
  --bg: oklch(98.5% 0.006 85);
  --bg-2: oklch(96% 0.008 85);
  --bg-3: oklch(93% 0.01 85);
  --ink: oklch(18% 0.012 60);
  --ink-2: oklch(36% 0.012 60);
  --ink-3: oklch(55% 0.01 60);
  --rule: oklch(88% 0.008 85);
  --rule-strong: oklch(78% 0.008 85);
  --accent: oklch(72% 0.14 68);     /* amber-gold */
  --accent-ink: oklch(38% 0.12 55);
  --accent-wash: oklch(95% 0.04 80);
  --ok: oklch(58% 0.12 150);
  --warn: oklch(68% 0.14 60);
  --err: oklch(58% 0.18 28);
  --info: oklch(58% 0.11 240);
  --shadow: 0 1px 0 rgba(40, 30, 10, 0.04), 0 2px 6px rgba(40, 30, 10, 0.04);
}

[data-theme="dark"] {
  --bg: oklch(16% 0.012 70);
  --bg-2: oklch(20% 0.014 70);
  --bg-3: oklch(24% 0.016 70);
  --ink: oklch(95% 0.008 85);
  --ink-2: oklch(78% 0.01 80);
  --ink-3: oklch(58% 0.012 80);
  --rule: oklch(28% 0.014 70);
  --rule-strong: oklch(38% 0.016 70);
  --accent: oklch(78% 0.14 75);
  --accent-ink: oklch(82% 0.14 75);
  --accent-wash: oklch(26% 0.04 70);
  --ok: oklch(72% 0.14 150);
  --warn: oklch(78% 0.14 70);
  --err: oklch(72% 0.16 28);
  --info: oklch(72% 0.12 240);
  --shadow: 0 1px 0 rgba(0, 0, 0, 0.3), 0 2px 12px rgba(0, 0, 0, 0.25);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size: 15.5px;
  line-height: 1.6;
}

body {
  min-height: 100vh;
}

::selection { background: var(--accent); color: var(--ink); }

/* Layout -------------------------------------------------- */

.shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  max-width: 1400px;
  margin: 0 auto;
  min-height: 100vh;
  gap: 0;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  border-right: 1px solid var(--rule);
  padding: 28px 24px 40px;
  background: var(--bg);
  z-index: 10;
}

.sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--rule-strong); border-radius: 3px; }

.content {
  padding: 48px 72px 120px;
  max-width: 860px;
  min-width: 0;
}

@media (max-width: 960px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar { position: relative; height: auto; border-right: none; border-bottom: 1px solid var(--rule); }
  .content { padding: 32px 24px 80px; }
}

/* Brand / masthead --------------------------------------- */

.mast {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 28px;
  text-decoration: none;
  color: var(--ink);
}

.mast-logo {
  width: 28px;
  height: 28px;
  object-fit: contain;
  display: block;
  flex-shrink: 0;
  border-radius: 6px;
}

.concept-link {
  margin-top: 24px;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
}
.concept-link a {
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 1px dotted var(--rule-strong);
}
.concept-link a:hover { color: var(--accent); border-bottom-color: var(--accent); }
.concept-label {
  display: inline-block;
  padding: 2px 7px;
  margin-right: 8px;
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 9.5px;
  font-weight: 600;
  color: var(--ink-3);
}

/* Faucet widget — onboarding §03 */
.faucet-card {
  margin-top: 16px;
  padding: 18px;
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: var(--bg-2);
}
.faucet-row {
  display: flex;
  gap: 10px;
  align-items: stretch;
}
#faucet-addr {
  flex: 1;
  padding: 10px 12px;
  background: var(--bg);
  border: 1px solid var(--rule-strong);
  border-radius: 4px;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
}
#faucet-addr:focus {
  outline: none;
  border-color: var(--accent-ink);
  box-shadow: 0 0 0 3px var(--accent-wash);
}
#faucet-submit {
  padding: 10px 20px;
  background: var(--ink);
  color: var(--bg);
  border: 0;
  border-radius: 4px;
  font-family: var(--font-sans);
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  transition: background 140ms;
}
#faucet-submit:hover:not(:disabled) { background: var(--accent-ink); }
#faucet-submit:disabled { opacity: 0.4; cursor: wait; }
.faucet-status {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  min-height: 1.2em;
  color: var(--ink-3);
}
.faucet-status[data-tone="ok"]  { color: var(--ok);  }
.faucet-status[data-tone="err"] { color: var(--err); }
.faucet-status a { color: inherit; text-decoration: underline; margin-left: 6px; }

.mast-name {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.mast-name .big {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 400;
  letter-spacing: -0.02em;
}

.mast-name .small {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 2px;
}

/* Sidebar nav (TOC with checkable items) ----------------- */

.nav-section {
  margin-bottom: 22px;
}

.nav-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 10px;
  padding: 0 4px;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 6px 4px 6px 8px;
  font-size: 13.5px;
  color: var(--ink-2);
  text-decoration: none;
  border-radius: 4px;
  line-height: 1.35;
  transition: color 0.1s, background 0.1s;
}

.nav-link:hover { color: var(--ink); background: var(--bg-2); }

.nav-link.active {
  color: var(--ink);
  background: var(--bg-2);
}

.nav-link.active::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--accent);
  border-radius: 1px;
}

.nav-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
  min-width: 18px;
  padding-top: 1px;
}

.nav-check {
  appearance: none;
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
  cursor: pointer;
  margin: 0;
  flex-shrink: 0;
  margin-top: 3px;
  background: transparent;
  position: relative;
  transition: border-color 0.1s, background 0.1s;
}
.nav-check:hover { border-color: var(--ink-2); }
.nav-check:checked {
  background: var(--accent);
  border-color: var(--accent);
}
.nav-check:checked::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 10'><path d='M2 5.5L4 7.5L8 3' fill='none' stroke='%23000' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/></svg>");
  background-repeat: no-repeat;
  background-position: center;
}

.nav-check:checked + .nav-link-text {
  color: var(--ink-3);
  text-decoration: line-through;
  text-decoration-color: var(--rule-strong);
  text-decoration-thickness: 1px;
}

.nav-link-text { flex: 1; }

/* Progress meter */
.progress-meter {
  margin-top: 4px;
  padding: 10px 12px;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--bg-2);
  margin-bottom: 20px;
}

.progress-meter-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.progress-meter-top b {
  color: var(--ink);
  font-weight: 600;
  font-family: var(--font-mono);
}

.progress-bar {
  height: 3px;
  background: var(--rule);
  border-radius: 2px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent);
  transition: width 0.3s ease;
  width: 0%;
}

/* Sidebar footer: switchers ------------------------------ */

.side-footer {
  position: sticky;
  bottom: 0;
  margin: 24px -24px -40px;
  padding: 16px 24px 40px;
  border-top: 1px solid var(--rule);
  background: var(--bg);
  z-index: 20;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

@media (max-width: 960px) {
  .side-footer {
    position: static;
    margin: 24px 0 0;
    padding: 16px 0 0;
  }
}

.guide-switch {
  display: flex;
  border: 1px solid var(--rule);
  border-radius: 6px;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 11px;
}

.guide-switch a {
  flex: 1;
  text-align: center;
  padding: 8px 4px;
  color: var(--ink-2);
  text-decoration: none;
  background: var(--bg);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.guide-switch a.current {
  background: var(--ink);
  color: var(--bg);
}

.theme-row {
  display: flex;
  gap: 8px;
}

.icon-btn {
  flex: 1;
  padding: 8px;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--bg);
  color: var(--ink-2);
  font-family: var(--font-mono);
  font-size: 11px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: border-color 0.1s, color 0.1s;
}

.icon-btn:hover { border-color: var(--rule-strong); color: var(--ink); }

/* Content ------------------------------------------------ */

.doc-header {
  padding-bottom: 28px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 40px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-3);
  margin-bottom: 14px;
  display: flex;
  gap: 14px;
  align-items: center;
}

.eyebrow .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--ok) 20%, transparent);
}

.doc-title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 56px;
  line-height: 0.98;
  letter-spacing: var(--tracking-tighter);
  margin: 0 0 16px;
  color: var(--ink);
}

.doc-lede {
  font-size: 19px;
  line-height: 1.5;
  color: var(--ink-2);
  max-width: 60ch;
  margin: 0 0 20px;
  letter-spacing: -0.01em;
}

.doc-meta {
  display: flex;
  gap: 24px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--ink-3);
  flex-wrap: wrap;
}

.doc-meta b {
  color: var(--ink-2);
  font-weight: 500;
}

h2.section {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 34px;
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin: 72px 0 18px;
  color: var(--ink);
  scroll-margin-top: 24px;
}

h2.section .num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
  display: block;
  margin-bottom: 6px;
}

#ref > h2.section {
  margin-bottom: 8px;
}

h3.sub {
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.015em;
  margin: 36px 0 12px;
  color: var(--ink);
  scroll-margin-top: 24px;
}

h4.subsub {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-3);
  margin: 24px 0 10px;
}

p {
  margin: 0 0 14px;
  color: var(--ink-2);
}

p strong, li strong { color: var(--ink); font-weight: 600; }

a { color: var(--accent-ink); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 2px; text-decoration-color: color-mix(in oklab, var(--accent-ink) 40%, transparent); }
a:hover { text-decoration-color: var(--accent-ink); }

ul, ol { margin: 0 0 16px; padding-left: 20px; color: var(--ink-2); }
li { margin-bottom: 6px; }

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-2);
  border: 1px solid var(--rule);
  padding: 1px 5px;
  border-radius: 4px;
  letter-spacing: var(--tracking-mono);
  color: var(--ink);
}

/* Code blocks -------------------------------------------- */

.codeblock {
  margin: 18px 0 24px;
  border: 1px solid var(--rule);
  border-radius: 8px;
  overflow: hidden;
  background: var(--bg-2);
}

.codeblock-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px 8px 14px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--ink-3);
}

.codeblock-head .file {
  color: var(--ink-2);
  letter-spacing: -0.01em;
}

.codeblock-head .tools { display: flex; gap: 6px; }

.lang-tabs {
  display: flex;
  gap: 2px;
}

.lang-tab {
  border: none;
  background: transparent;
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 9px;
  cursor: pointer;
  border-radius: 4px;
  text-transform: lowercase;
  letter-spacing: 0;
}

.lang-tab:hover { color: var(--ink); }
.lang-tab.active {
  background: var(--bg-3);
  color: var(--ink);
}

.copy-btn {
  border: none;
  background: transparent;
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 8px;
  cursor: pointer;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: color 0.1s, background 0.1s;
}

.copy-btn:hover { color: var(--ink); background: var(--bg-3); }
.copy-btn.copied { color: var(--ok); }

.codeblock pre {
  margin: 0;
  padding: 16px 18px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--ink);
  letter-spacing: var(--tracking-mono);
  background: var(--bg-2);
}

.codeblock pre::-webkit-scrollbar { height: 6px; }
.codeblock pre::-webkit-scrollbar-thumb { background: var(--rule-strong); border-radius: 3px; }

.codeblock .lang-panel { display: none; }
.codeblock .lang-panel.active { display: block; }

/* Minimal syntax tint (applied via token spans) */
.tok-k { color: oklch(55% 0.14 300); }
.tok-s { color: oklch(48% 0.12 140); }
.tok-n { color: oklch(55% 0.14 40); }
.tok-c { color: var(--ink-3); font-style: italic; }
.tok-f { color: oklch(50% 0.12 240); }
.tok-p { color: var(--ink); }
[data-theme="dark"] .tok-k { color: oklch(78% 0.14 300); }
[data-theme="dark"] .tok-s { color: oklch(78% 0.14 140); }
[data-theme="dark"] .tok-n { color: oklch(80% 0.14 50); }
[data-theme="dark"] .tok-f { color: oklch(78% 0.14 240); }

/* Callouts ----------------------------------------------- */

.callout {
  margin: 22px 0;
  padding: 14px 18px;
  border-left: 2px solid var(--accent);
  background: var(--bg-2);
  border-radius: 0 6px 6px 0;
  font-size: 14.5px;
  color: var(--ink-2);
}

.callout .ctitle {
  font-family: var(--font-mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-3);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.callout.warn { border-left-color: var(--warn); }
.callout.err { border-left-color: var(--err); }
.callout.info { border-left-color: var(--info); }
.callout.ok { border-left-color: var(--ok); }

.callout.warn .ctitle,
.callout.err .ctitle,
.callout.info .ctitle,
.callout.ok .ctitle { color: var(--ink-2); }

.callout p:last-child { margin-bottom: 0; }

/* Tables ------------------------------------------------- */

.tbl {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0 28px;
  font-size: 13.5px;
}

.tbl th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 10px 14px;
  border-bottom: 1px solid var(--rule-strong);
  background: var(--bg-2);
}

.tbl td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
  color: var(--ink-2);
}

.tbl td:first-child, .tbl th:first-child { padding-left: 14px; }

.tbl td code { font-size: 12px; }

.tbl tr:last-child td { border-bottom: none; }

.tbl.dense td, .tbl.dense th { padding: 7px 12px; }

.endpoint-ref {
  margin: 0 0 30px;
  width: min(1120px, calc(100vw - 48px));
  max-width: none;
}

.endpoint-radio {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.endpoint-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin: 0 0 10px;
}

.endpoint-title {
  margin: 0;
}

.endpoint-toggle {
  display: inline-flex;
  flex: 0 0 auto;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--bg-2);
}

.endpoint-tab {
  min-width: 78px;
  padding: 5px 10px;
  border-radius: 4px;
  cursor: pointer;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  user-select: none;
}

@media (max-width: 560px) {
  .endpoint-head {
    align-items: flex-start;
    flex-direction: column;
  }
}

.endpoint-tab:hover {
  color: var(--ink);
}

#endpoint-testnet:checked ~ .endpoint-head label[for="endpoint-testnet"],
#endpoint-mainnet:checked ~ .endpoint-head label[for="endpoint-mainnet"] {
  color: var(--ink);
  background: var(--bg);
  box-shadow: inset 0 0 0 1px var(--rule-strong);
}

.endpoint-panel {
  display: none;
  margin-top: 0;
}

.endpoint-panels {
  overflow-x: visible;
}

#endpoint-testnet:checked ~ .endpoint-panels .endpoint-panel-testnet,
#endpoint-mainnet:checked ~ .endpoint-panels .endpoint-panel-mainnet {
  display: table;
}

.endpoint-table {
  width: max-content;
  min-width: 100%;
  table-layout: auto;
}

.endpoint-table th:first-child,
.endpoint-table td:first-child {
  width: 150px;
}

.endpoint-table code {
  white-space: nowrap;
  overflow-wrap: normal;
  word-break: normal;
}

.endpoint-table .endpoint-group th {
  padding-top: 14px;
  border-bottom-color: var(--rule);
  background: transparent;
  color: var(--ink);
}

@media (max-width: 760px) {
  .endpoint-ref {
    width: 100%;
  }

  .endpoint-panels {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

/* Step cards --------------------------------------------- */

.step-card {
  position: relative;
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 22px 24px 22px 64px;
  margin: 18px 0;
  background: var(--bg);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.step-card > .step-toggle {
  position: absolute;
  top: 24px;
  right: 22px;
}

.step-card:hover { border-color: var(--rule-strong); }

.step-card.done { background: color-mix(in oklab, var(--ok) 4%, var(--bg)); border-color: color-mix(in oklab, var(--ok) 25%, var(--rule)); }

.step-num {
  position: absolute;
  top: 22px;
  left: 22px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--rule-strong);
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-2);
  background: var(--bg);
}

.step-card.done .step-num {
  background: var(--ok);
  border-color: var(--ok);
  color: oklch(12% 0 0);
}

.step-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 6px;
  padding-right: 34px; /* reserve space for .step-toggle */
}

.step-title {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin: 0;
  flex: 1 1 auto;
  min-width: 0;
}

.step-who {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  white-space: nowrap;
  padding: 2px 8px;
  border: 1px solid var(--rule);
  border-radius: 999px;
}

.step-desc {
  font-size: 14.5px;
  color: var(--ink-2);
  margin: 0;
}

.step-toggle {
  appearance: none;
  position: relative;
  width: 18px;
  height: 18px;
  border: 1px solid var(--rule-strong);
  border-radius: 4px;
  cursor: pointer;
  background: var(--bg);
  flex: 0 0 auto;
}

.step-toggle:checked {
  background: var(--ok);
  border-color: var(--ok);
}

.step-toggle:checked::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 14 14'><path d='M3 7.5L6 10.5L11 4.5' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/></svg>");
  background-repeat: no-repeat;
  background-position: center;
}

/* Key / value blocks ------------------------------------ */

.kv {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 0;
  margin: 18px 0;
  border-top: 1px solid var(--rule);
  font-size: 13.5px;
}

.kv > dt, .kv > dd {
  padding: 10px 0;
  border-bottom: 1px solid var(--rule);
  margin: 0;
}

.kv > dt {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding-right: 16px;
}

.kv > dd {
  color: var(--ink-2);
}

/* Search ------------------------------------------------- */

.searchbar {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--bg-2);
  margin-bottom: 18px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-3);
}

.searchbar:hover { border-color: var(--rule-strong); }

.searchbar kbd {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 10px;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-bottom-width: 2px;
  padding: 1px 5px;
  border-radius: 3px;
  color: var(--ink-2);
}

.search-overlay {
  position: fixed;
  inset: 0;
  background: color-mix(in oklab, var(--ink) 30%, transparent);
  backdrop-filter: blur(4px);
  display: none;
  z-index: 100;
  padding-top: 10vh;
}
.search-overlay.open { display: block; }

.search-panel {
  max-width: 560px;
  margin: 0 auto;
  background: var(--bg);
  border: 1px solid var(--rule-strong);
  border-radius: 12px;
  box-shadow: 0 40px 80px rgba(0, 0, 0, 0.25);
  overflow: hidden;
}

.search-input {
  width: 100%;
  border: none;
  background: transparent;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 17px;
  padding: 18px 20px;
  border-bottom: 1px solid var(--rule);
  outline: none;
}

.search-input::placeholder { color: var(--ink-3); }

.search-results {
  max-height: 50vh;
  overflow-y: auto;
  padding: 8px;
}

.search-hit {
  display: block;
  padding: 10px 12px;
  border-radius: 6px;
  text-decoration: none;
  color: var(--ink);
  cursor: pointer;
}

.search-hit:hover, .search-hit.focused { background: var(--bg-2); }

.search-hit .h-crumb {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 2px;
}

.search-hit .h-text { font-size: 14px; color: var(--ink); }

.search-hit mark {
  background: var(--accent);
  color: var(--ink);
  padding: 0 2px;
  border-radius: 2px;
}

.search-empty {
  padding: 24px;
  text-align: center;
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: 12px;
}

/* Diagram container ------------------------------------- */

.diagram {
  margin: 26px 0 32px;
  border: 1px solid var(--rule);
  border-radius: 10px;
  background: var(--bg-2);
  padding: 28px;
  position: relative;
}

.diagram-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 18px;
}

.diagram-title {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-3);
}

.diagram-controls {
  display: flex;
  gap: 6px;
}

.diagram-btn {
  border: 1px solid var(--rule);
  background: var(--bg);
  color: var(--ink-2);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 10px;
  cursor: pointer;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.diagram-btn:hover { border-color: var(--rule-strong); color: var(--ink); }
.diagram-btn.primary { background: var(--ink); color: var(--bg); border-color: var(--ink); }

/* ASCII-ish flow blocks --------------------------------- */

.flow {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  white-space: pre;
  color: var(--ink-2);
  overflow-x: auto;
  padding: 16px 18px;
  background: var(--bg-2);
  border: 1px solid var(--rule);
  border-radius: 6px;
  margin: 18px 0;
}

/* Foot rule ---------------------------------------------- */

.content-foot {
  margin-top: 96px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.content-foot a { color: var(--ink-2); text-decoration: none; }
.content-foot a:hover { color: var(--ink); }

/* Badge --------------------------------------------------- */

.pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 8px;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-2);
}

.pill.ok { border-color: color-mix(in oklab, var(--ok) 50%, var(--rule)); color: var(--ok); }
.pill.warn { border-color: color-mix(in oklab, var(--warn) 50%, var(--rule)); color: var(--warn); }

/* Grids -------------------------------------------------- */

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin: 18px 0;
}
@media (max-width: 720px) { .two-col { grid-template-columns: 1fr; } }

.card {
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 18px 20px;
  background: var(--bg);
}

.card h5 {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.card p {
  font-size: 13.5px;
  margin: 0;
  color: var(--ink-2);
}

/* Topbar (mobile) — hidden at desktop */
.topbar { display: none; }

/* Animated protocol diagram --------------------------------- */
@keyframes packet-run {
  0% { transform: translateX(0); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { transform: translateX(var(--run-x, 300px)); opacity: 0; }
}

.animated-line { stroke-dasharray: 2 3; }


/* =============================================================
   Print — PDF export
   Force light, single-column, no sidebar, pagination-aware.
   ============================================================= */
@media print {
  /* Force light palette and print-safe colors */
  :root, [data-theme="dark"] {
    --bg: white;
    --bg-2: #faf7f2;
    --bg-3: #f2ede4;
    --ink: #1a140a;
    --ink-2: #3a3226;
    --ink-3: #6b6156;
    --rule: #d9d0c2;
    --rule-strong: #b8ad9b;
    --accent: #b8811f;
    --accent-ink: #7a5410;
    --accent-wash: #f8f1dd;
    --ok: #4a7a2e;
    --warn: #a06820;
    --err: #a42b1c;
    --info: #1d5a8a;
    --shadow: none;
  }

  @page {
    size: Letter;
    margin: 0.7in 0.65in 0.85in;
  }
  @page :first {
    margin-top: 0.55in;
  }

  html, body {
    font-size: 10.5pt !important;
    line-height: 1.45 !important;
    background: white !important;
    color: var(--ink) !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  /* Single-column layout: hide sidebar + all floating UI */
  .shell {
    display: block !important;
    max-width: none !important;
  }
  .sidebar,
  .theme-toggle,
  .search-overlay,
  .searchbar,
  .progress-meter,
  .nav-section,
  .topbar,
  .copy-btn,
  .tools {
    display: none !important;
  }

  .main {
    padding: 0 !important;
    max-width: none !important;
  }

  /* Masthead on first page */
  .mast {
    display: flex !important;
    align-items: center;
    gap: 14px;
    margin-bottom: 18pt;
    padding-bottom: 10pt;
    border-bottom: 1pt solid var(--rule-strong);
  }

  /* Headings + pagination */
  h1, h2, h3, h4 { break-after: avoid; page-break-after: avoid; }
  h2.section {
    font-size: 22pt !important;
    margin-top: 18pt !important;
    margin-bottom: 8pt !important;
    break-before: page;
    page-break-before: always;
  }
  h2.section:first-of-type { break-before: auto; page-break-before: auto; }
  h3.sub  { font-size: 13pt !important; margin-top: 14pt !important; }
  h4.subsub { font-size: 11pt !important; margin-top: 10pt !important; }

  p { orphans: 3; widows: 3; }

  /* Links: show URL after the text for external refs */
  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-family: var(--font-mono);
    font-size: 8.5pt;
    color: var(--ink-3);
    word-break: break-all;
  }
  /* Don't print URLs for in-page anchors or cross-doc hash links */
  a[href^="#"]::after,
  a[href$=".html"]::after,
  a.mast::after { content: ""; }

  /* Code blocks */
  .codeblock {
    break-inside: avoid;
    page-break-inside: avoid;
    background: var(--bg-2) !important;
    border: 0.5pt solid var(--rule) !important;
    box-shadow: none !important;
  }
  .codeblock-head { background: var(--bg-3) !important; }
  .codeblock pre {
    font-size: 8.5pt !important;
    line-height: 1.45 !important;
    white-space: pre-wrap !important;
    word-break: break-word !important;
  }
  /* Print only the active language panel */
  .lang-panel { display: none !important; }
  .lang-panel.active { display: block !important; }
  .lang-tabs { display: none !important; }

  /* Step cards */
  .step-card {
    break-inside: avoid;
    page-break-inside: avoid;
    border: 0.5pt solid var(--rule-strong) !important;
    box-shadow: none !important;
    padding: 14pt 16pt 14pt 44pt !important;
    margin: 8pt 0 !important;
  }
  .step-toggle { display: none !important; }
  .step-num {
    top: 12pt !important;
    left: 12pt !important;
    width: 22pt !important;
    height: 22pt !important;
    font-size: 8.5pt !important;
    background: var(--bg-2) !important;
  }
  .step-head { padding-right: 0 !important; }
  .step-title { font-size: 11.5pt !important; }
  .step-desc  { font-size: 10pt !important; }

  /* Cards / callouts */
  .card, .two-col > * {
    break-inside: avoid;
    page-break-inside: avoid;
    box-shadow: none !important;
  }
  .two-col {
    display: grid !important;
    grid-template-columns: 1fr 1fr !important;
    gap: 10pt !important;
  }

  /* Tables */
  table {
    width: 100% !important;
    font-size: 9.5pt !important;
    border-collapse: collapse !important;
    break-inside: auto;
  }
  tr { break-inside: avoid; page-break-inside: avoid; }
  th, td {
    padding: 5pt 8pt !important;
    border: 0.5pt solid var(--rule) !important;
  }

  /* Key-value reference blocks */
  .kv, dl { break-inside: avoid; page-break-inside: avoid; }

  /* Flow diagram */
  .flow {
    font-size: 9pt !important;
    break-inside: avoid;
    page-break-inside: avoid;
    box-shadow: none !important;
  }

  /* Animated SVG diagrams — freeze animations so they print */
  svg * {
    animation: none !important;
  }
  .animated-line { stroke-dasharray: none !important; }

  /* Selection color reset for print */
  ::selection { background: transparent; color: inherit; }
}