/* BRC-20 protocol documentation. Ledger typography, ink on paper. */

:root {
  --paper: #f7f1e3;
  --paper-raised: #fcf8ee;
  --ink: #2b2318;
  --ink-soft: #5d5342;
  --rule: #d9cdb4;
  --rule-strong: #8f8264;
  --accent: #7a4d10;
  --accent-strong: #5f3c0c;
  --credit: #295f3f;
  --debit: #983a28;
  --mark: #f0e4c8;
  --focus: #7a4d10;
  color-scheme: light;
}

[data-theme="dark"] {
  --paper: #1c1813;
  --paper-raised: #26211a;
  --ink: #e9dcc3;
  --ink-soft: #b0a288;
  --rule: #3d362a;
  --rule-strong: #6d6144;
  --accent: #e0a83f;
  --accent-strong: #ecc077;
  --credit: #7cc79a;
  --debit: #e08e77;
  --mark: #33291a;
  --focus: #e0a83f;
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #1c1813;
    --paper-raised: #26211a;
    --ink: #e9dcc3;
    --ink-soft: #b0a288;
    --rule: #3d362a;
    --rule-strong: #6d6144;
    --accent: #e0a83f;
    --accent-strong: #ecc077;
    --credit: #7cc79a;
    --debit: #e08e77;
    --mark: #33291a;
    --focus: #e0a83f;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, Georgia, serif;
  font-size: 1.0625rem;
  line-height: 1.6;
  font-variant-numeric: oldstyle-nums;
}

code, pre, kbd, samp, .num, td.amount, .mono {
  font-family: ui-monospace, "Cascadia Mono", Consolas, "SF Mono", Menlo, monospace;
  font-variant-numeric: tabular-nums lining-nums;
}

.wrap { max-width: 47rem; margin: 0 auto; padding: 0 1.25rem; }

/* Skip link */
.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--paper-raised); color: var(--ink);
  padding: 0.5rem 1rem; border: 1px solid var(--rule-strong); z-index: 10;
}
.skip-link:focus { left: 0.5rem; top: 0.5rem; }

:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

/* Masthead */
.masthead { border-bottom: 3px double var(--rule-strong); padding: 1.4rem 0 0.9rem; }
.masthead-row { display: flex; flex-wrap: wrap; gap: 0.6rem 1.25rem; align-items: baseline; }
.masthead .site-name {
  font-size: 1.55rem; font-weight: 700; letter-spacing: 0.04em;
  color: var(--ink); text-decoration: none; white-space: nowrap;
}
.masthead .site-name .folio { color: var(--accent); }
.masthead .site-sub {
  margin: 0.15rem 0 0; color: var(--ink-soft); font-style: italic; font-size: 0.95rem;
}
.masthead-tools { margin-left: auto; display: flex; align-items: center; gap: 0.75rem; }

.site-nav { margin-top: 0.75rem; }
.site-nav ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.1rem 1.15rem; }
.site-nav a {
  font-family: inherit; font-size: 0.82rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-soft); text-decoration: none; padding: 0.2rem 0;
}
.site-nav a:hover { color: var(--accent-strong); }
.site-nav a[aria-current="page"] {
  color: var(--ink); border-bottom: 2px solid var(--accent);
}

/* Theme toggle */
.theme-toggle {
  background: none; border: 1px solid var(--rule-strong); color: var(--ink-soft);
  font: inherit; font-size: 0.78rem; letter-spacing: 0.1em; text-transform: uppercase;
  padding: 0.25rem 0.6rem; cursor: pointer; border-radius: 2px;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--ink-soft); }
.no-js .theme-toggle { display: none; }

/* Search */
.search { position: relative; }
.search input[type="search"] {
  font: inherit; font-size: 0.9rem; color: var(--ink);
  background: var(--paper-raised); border: 1px solid var(--rule-strong); border-radius: 2px;
  padding: 0.3rem 0.6rem; width: 11.5rem; max-width: 45vw;
}
.search input::placeholder { color: var(--ink-soft); opacity: 1; }
.search-results {
  position: absolute; right: 0; top: calc(100% + 4px); z-index: 20;
  width: min(24rem, 88vw); max-height: 22rem; overflow-y: auto;
  background: var(--paper-raised); border: 1px solid var(--rule-strong);
  box-shadow: 0 4px 14px rgba(0,0,0,0.18);
  margin: 0; padding: 0; list-style: none;
}
.search-results:empty { display: none; }
.search-results li { border-bottom: 1px solid var(--rule); }
.search-results li:last-child { border-bottom: none; }
.search-results a, .search-results .search-empty {
  display: block; padding: 0.5rem 0.75rem; text-decoration: none; color: var(--ink);
}
.search-results a:hover, .search-results a:focus { background: var(--mark); }
.search-results .result-page {
  display: block; font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent);
}
.search-results .result-snippet { display: block; font-size: 0.85rem; color: var(--ink-soft); }
.search-empty { color: var(--ink-soft); font-style: italic; }

/* Body copy */
main { padding: 1.5rem 0 2.5rem; }

h1, h2, h3, h4 { line-height: 1.25; font-weight: 700; }
h1 { font-size: 1.9rem; margin: 1rem 0 0.5rem; }
h2 {
  font-size: 1.35rem; margin: 2.2rem 0 0.7rem;
  padding-bottom: 0.25rem; border-bottom: 1px solid var(--rule);
}
h3 { font-size: 1.1rem; margin: 1.6rem 0 0.5rem; }
h4 { font-size: 1rem; margin: 1.2rem 0 0.4rem; }

.kicker {
  font-size: 0.8rem; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--accent); margin: 1.5rem 0 0;
}

.lede { font-size: 1.15rem; color: var(--ink); }

p, ul, ol, dl { margin: 0.75rem 0; }
li { margin: 0.3rem 0; }

a { color: var(--accent-strong); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--accent); }

hr { border: none; border-top: 3px double var(--rule-strong); margin: 2.5rem 0; }

strong { font-weight: 700; }

mark { background: var(--mark); color: var(--ink); padding: 0 0.15em; }

/* Code */
pre {
  background: var(--paper-raised); border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  padding: 0.8rem 1rem; overflow-x: auto; font-size: 0.88rem; line-height: 1.55;
}
code { font-size: 0.88em; background: var(--paper-raised); padding: 0.08em 0.3em; border: 1px solid var(--rule); border-radius: 2px; }
pre code { background: none; border: none; padding: 0; font-size: inherit; overflow-wrap: normal; }
/* Inline code can hold long unbreakable tokens (inscription IDs, payloads).
   Let those wrap so no page ever scrolls sideways; pre blocks scroll instead. */
:not(pre) > code { overflow-wrap: anywhere; }
p, li, dd, td, th, figcaption { overflow-wrap: break-word; }

/* Ledger tables */
.table-scroll { overflow-x: auto; margin: 1rem 0; }
table { border-collapse: collapse; width: 100%; font-size: 0.92rem; }
caption {
  caption-side: top; text-align: left; padding-bottom: 0.4rem;
  font-size: 0.8rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-soft);
}
th {
  text-align: left; font-size: 0.78rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--ink-soft); font-weight: 700;
  border-top: 2px solid var(--rule-strong); border-bottom: 1px solid var(--rule-strong);
  padding: 0.45rem 0.75rem 0.45rem 0;
}
td { border-bottom: 1px solid var(--rule); padding: 0.45rem 0.75rem 0.45rem 0; vertical-align: top; }
tr:last-child td { border-bottom: 2px solid var(--rule-strong); }
th.amount, td.amount { text-align: right; white-space: nowrap; }
td .req { color: var(--debit); font-weight: 700; }
td .opt { color: var(--ink-soft); }

.credit { color: var(--credit); }
.debit { color: var(--debit); }

/* Posting blocks: double-entry motif */
.posting {
  border: 1px solid var(--rule-strong); background: var(--paper-raised);
  margin: 1.25rem 0; padding: 0.9rem 1.1rem;
}
.posting h3, .posting h4 { margin-top: 0; }
.posting table { font-size: 0.9rem; }

/* Rule list */
ol.rules { counter-reset: rule; list-style: none; padding-left: 0; }
ol.rules > li {
  counter-increment: rule; position: relative;
  padding: 0.55rem 0 0.55rem 4rem; border-bottom: 1px solid var(--rule); margin: 0;
}
ol.rules > li::before {
  content: "R" counter(rule);
  position: absolute; left: 0; top: 0.55rem;
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 0.85rem; font-weight: 700; color: var(--accent);
}
ol.rules > li:target { background: var(--mark); }

/* Callouts */
.note, .warn {
  border: 1px solid var(--rule-strong); border-left-width: 4px;
  padding: 0.7rem 1rem; margin: 1rem 0; background: var(--paper-raised); font-size: 0.95rem;
}
.note { border-left-color: var(--accent); }
.warn { border-left-color: var(--debit); }
.note > :first-child, .warn > :first-child { margin-top: 0; }
.note > :last-child, .warn > :last-child { margin-bottom: 0; }
.note-label {
  display: block; font-size: 0.75rem; letter-spacing: 0.15em; text-transform: uppercase;
  color: var(--accent-strong); margin-bottom: 0.2rem;
}
.warn .note-label { color: var(--debit); }

/* Definition lists */
dt { font-weight: 700; margin-top: 0.8rem; }
dd { margin: 0.15rem 0 0 1.5rem; color: var(--ink); }

/* Fact sheet on the front page */
.factsheet td:first-child {
  font-size: 0.8rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--ink-soft); white-space: nowrap; padding-right: 1.25rem;
}

/* Screen-reader-only text */
.sr-only {
  position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* Diagrams */
.diagram text {
  fill: currentColor;
  font-family: ui-monospace, "Cascadia Mono", Consolas, "SF Mono", Menlo, monospace;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}
.diagram .d-label { font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; fill: var(--ink-soft); }
.diagram .d-head { font-weight: 700; }
.diagram .d-accent { fill: var(--accent); }
.diagram .d-credit { fill: var(--credit); }
.diagram .d-debit { fill: var(--debit); }
.diagram .d-rule { stroke: var(--rule-strong); stroke-width: 1; }
.diagram .d-rule-soft { stroke: var(--rule); stroke-width: 1; }
.diagram .d-double { stroke: var(--rule-strong); stroke-width: 3; }
.diagram .d-box { fill: var(--paper-raised); stroke: var(--rule-strong); stroke-width: 1; }
.diagram .d-arrow { stroke: var(--accent); stroke-width: 1.5; fill: none; }
.diagram .d-arrowhead { fill: var(--accent); }

figure { margin: 1.5rem 0; }
figure svg { max-width: 100%; height: auto; display: block; }
figcaption { font-size: 0.85rem; color: var(--ink-soft); font-style: italic; margin-top: 0.4rem; }
.diagram { color: var(--ink); }

/* Vector cards */
.vector { border: 1px solid var(--rule); margin: 1.1rem 0; background: var(--paper-raised); }
.vector > .vector-head {
  display: flex; flex-wrap: wrap; gap: 0.3rem 0.9rem; align-items: baseline;
  padding: 0.5rem 0.9rem; border-bottom: 1px solid var(--rule);
}
.vector-head strong { font-size: 0.95rem; }
.vector .verdict {
  font-size: 0.75rem; letter-spacing: 0.13em; text-transform: uppercase; font-weight: 700;
}
.vector .verdict.ok { color: var(--credit); }
.vector .verdict.bad { color: var(--debit); }
.vector pre { border: none; border-bottom: 1px solid var(--rule); margin: 0; }
.vector .vector-why { padding: 0.55rem 0.9rem; font-size: 0.9rem; margin: 0; }

/* Validator */
.tool-form textarea {
  width: 100%; min-height: 10rem; font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 0.9rem; color: var(--ink); background: var(--paper-raised);
  border: 1px solid var(--rule-strong); padding: 0.7rem; border-radius: 2px; resize: vertical;
}
.tool-form button, .btn {
  font: inherit; font-size: 0.85rem; letter-spacing: 0.12em; text-transform: uppercase;
  background: var(--ink); color: var(--paper); border: 1px solid var(--ink);
  padding: 0.45rem 1.1rem; cursor: pointer; border-radius: 2px; text-decoration: none;
}
.tool-form button:hover, .btn:hover { background: var(--accent-strong); border-color: var(--accent-strong); color: var(--paper); }
.tool-form button.secondary {
  background: none; color: var(--ink-soft); border-color: var(--rule-strong);
}
.tool-form button.secondary:hover { color: var(--ink); background: var(--mark); }
.tool-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; margin: 0.7rem 0; }

.check-list { list-style: none; padding: 0; margin: 1rem 0; }
.check-list li {
  display: grid; grid-template-columns: 5.2rem 1fr; gap: 0.75rem;
  padding: 0.5rem 0; border-bottom: 1px solid var(--rule); font-size: 0.93rem;
}
.check-list .status {
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 0.78rem; font-weight: 700; letter-spacing: 0.08em; white-space: nowrap;
}
.check-list .status.pass { color: var(--credit); }
.check-list .status.fail { color: var(--debit); }
.check-list .status.warn { color: var(--accent-strong); }
.check-list .status.info { color: var(--ink-soft); }
.verdict-line { font-size: 1.05rem; font-weight: 700; margin: 1rem 0 0.25rem; }
.verdict-line.ok { color: var(--credit); }
.verdict-line.bad { color: var(--debit); }

/* Footer */
.colophon {
  border-top: 3px double var(--rule-strong); margin-top: 2rem;
  padding: 1.2rem 0 2rem; font-size: 0.85rem; color: var(--ink-soft);
}
.colophon dl {
  display: grid; grid-template-columns: auto 1fr; gap: 0.15rem 1.25rem; margin: 0 0 0.9rem;
}
.colophon dt {
  margin: 0; font-weight: 400; font-size: 0.72rem; letter-spacing: 0.13em;
  text-transform: uppercase; align-self: baseline; padding-top: 0.15rem;
}
.colophon dd { margin: 0; }
.colophon a { color: inherit; }
.colophon a:hover { color: var(--accent-strong); }

@media (max-width: 540px) {
  body { font-size: 1rem; }
  h1 { font-size: 1.55rem; }
  .masthead-tools { margin-left: 0; width: 100%; }
  .search { flex: 1; }
  .search input[type="search"] { width: 100%; max-width: none; }
  .check-list li { grid-template-columns: 1fr; gap: 0.1rem; }
  .colophon dl { grid-template-columns: 1fr; }
  .colophon dt { padding-top: 0.5rem; }
}