/* Pearl Sighash Studio — blueprint / engineering-drafting theme.
   Cyan drafting ink on deep blueprint paper. No gradients-as-decoration;
   the grid IS the decoration. */
:root {
  --paper: #0a2249;
  --paper-2: #0c2856;
  --panel: rgba(8, 24, 58, .92);
  --ink: #aee9ff;
  --ink-dim: #6fb7d8;
  --ink-faint: #87a7ba;
  --accent: #7df9ff;
  --warn: #ffd479;
  --bad: #ffbfc7;
  --good: #8fffc4;
  --line: rgba(125, 249, 255, .22);
  --line-soft: rgba(125, 249, 255, .12);
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --sans: "Avenir Next Condensed", "Arial Narrow", "Helvetica Neue", Arial, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  background-color: var(--paper);
  /* drafting grid: fine 24px + major 120px */
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px),
    linear-gradient(rgba(125,249,255,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(125,249,255,.06) 1px, transparent 1px);
  background-size: 120px 120px, 120px 120px, 24px 24px, 24px 24px;
  min-height: 100vh;
}
::selection { background: var(--accent); color: #04203a; }

/* ---------- top bar ---------- */
.topbar {
  display: flex; flex-wrap: wrap; gap: 18px; align-items: center; justify-content: space-between;
  padding: 18px 26px;
  border-bottom: 2px solid var(--line);
  background: rgba(6, 18, 44, .96);
  position: sticky; top: 0; z-index: 50;
}
.brand { display: flex; gap: 16px; align-items: center; }
.seal .frame { fill: none; stroke: var(--accent); stroke-width: 2; }
.seal .ring { fill: none; stroke: var(--accent); stroke-width: 1.6; }
.seal .cross { stroke: var(--accent); stroke-width: 1.6; }
.seal .dot { fill: var(--accent); }
h1 {
  margin: 0; font-size: 30px; letter-spacing: .14em; text-transform: uppercase;
  color: var(--accent); font-weight: 600;
}
.tagline { margin: 4px 0 0; color: var(--ink-dim); font-size: 14px; letter-spacing: .04em; }
.steps { display: flex; gap: 8px; flex-wrap: wrap; }
.steps button {
  font-family: var(--mono); font-size: 13px; letter-spacing: .08em;
  background: transparent; color: var(--ink-dim);
  border: 1px solid var(--line); padding: 9px 14px; cursor: pointer;
  text-transform: uppercase;
}
.steps button:hover { color: var(--accent); border-color: var(--accent); }
.steps button.active { background: var(--accent); color: #04203a; border-color: var(--accent); font-weight: 700; }

/* ---------- margin strip ---------- */
.margin-strip {
  overflow: hidden; white-space: nowrap;
  border-bottom: 1px solid var(--line-soft);
  padding: 6px 0; background: rgba(6,18,44,.7);
}
.margin-strip span {
  display: inline-block; padding-left: 26px;
  font-family: var(--mono); font-size: 11px; letter-spacing: .35em; color: var(--ink-faint);
}

/* ---------- honest limits ---------- */
.limits {
  margin: 22px auto 0; max-width: 1180px; padding: 16px 22px;
  border: 1px dashed var(--warn); background: rgba(60, 44, 8, .25);
}
.limits h2 { margin: 0 0 8px; color: var(--warn); font-size: 15px; letter-spacing: .18em; text-transform: uppercase; }
.limits ul { margin: 0 0 10px; padding-left: 20px; color: var(--ink); font-size: 14px; }
.limits li { margin: 6px 0; }
.limits code, .hint code, .meta code, td code {
  font-family: var(--mono); font-size: .88em; color: var(--accent);
  background: rgba(125,249,255,.08); padding: 1px 5px;
}

/* ---------- panels (drafting plates) ---------- */
main { max-width: 1180px; margin: 0 auto; padding: 26px 22px 60px; }
.panel {
  display: none; position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 28px 30px 34px; margin-top: 26px;
}
/* corner registration marks */
.panel::before, .panel::after {
  content: ""; position: absolute; width: 18px; height: 18px; pointer-events: none;
}
.panel::before { top: -1px; left: -1px; border-top: 3px solid var(--accent); border-left: 3px solid var(--accent); }
.panel::after { bottom: -1px; right: -1px; border-bottom: 3px solid var(--accent); border-right: 3px solid var(--accent); }
.panel.active { display: block; }
.panel h2 {
  margin: 0 0 10px; font-size: 24px; letter-spacing: .1em; text-transform: uppercase; color: var(--accent);
  border-bottom: 1px solid var(--line-soft); padding-bottom: 12px; font-weight: 600;
}
.panel h3 { color: var(--ink); letter-spacing: .12em; text-transform: uppercase; font-size: 16px; margin: 26px 0 10px; }
.panel h4 { color: var(--ink-dim); letter-spacing: .1em; text-transform: uppercase; font-size: 13px; margin: 18px 0 8px; }
.fig {
  font-family: var(--mono); font-size: 13px; color: #04203a; background: var(--accent);
  padding: 3px 10px; margin-right: 12px; letter-spacing: .1em;
}
.lede { color: var(--ink-dim); max-width: 72ch; }
.hint { color: var(--ink-faint); font-size: 13.5px; }
.meta { color: var(--ink-dim); font-size: 13.5px; font-family: var(--mono); overflow-wrap: anywhere; }
.stamp {
  font-family: var(--mono); font-size: 11px; letter-spacing: .14em; color: var(--good);
  border: 1px solid var(--good); padding: 2px 8px; margin-left: 8px; vertical-align: middle;
}

/* ---------- forms & buttons ---------- */
.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin: 14px 0; }
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; margin: 12px 0; }
label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-dim); }
label.block { margin: 12px 0; }
input[type="text"], input[type="number"], select, textarea {
  font-family: var(--mono); font-size: 14px; color: var(--ink);
  background: rgba(4, 14, 36, .9); border: 1px solid var(--line);
  padding: 9px 11px; border-radius: 0; width: 100%;
}
input:focus, select:focus, textarea:focus { outline: 1px solid var(--accent); border-color: var(--accent); }
input[readonly] { color: var(--ink-faint); }
button {
  font-family: var(--mono); font-size: 14px; letter-spacing: .1em; text-transform: uppercase;
  padding: 11px 20px; cursor: pointer; border: 1px solid var(--accent);
  background: transparent; color: var(--accent);
}
button:hover { background: rgba(125,249,255,.12); }
button.primary { background: var(--accent); color: #04203a; font-weight: 700; }
button.primary:hover { background: #a5fcff; }
button.secondary { border-color: var(--ink-dim); color: var(--ink); }
button.danger { border-color: var(--bad); color: var(--bad); }
button.danger:hover { background: rgba(255,143,157,.12); }
button.mini { padding: 4px 10px; font-size: 12px; }
button:disabled { opacity: .4; cursor: not-allowed; }

/* ---------- flag cards ---------- */
.flag-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 10px; margin: 12px 0; }
.flag-card {
  border: 1px solid var(--line); padding: 12px 14px; cursor: pointer; background: rgba(4,14,36,.6);
}
.flag-card:hover { border-color: var(--accent); }
.flag-card.sel { border-color: var(--accent); background: rgba(125,249,255,.1); box-shadow: inset 0 0 0 1px var(--accent); }
.flag-card .fname { font-family: var(--mono); font-weight: 700; color: var(--accent); letter-spacing: .06em; }
.flag-card .fcode { font-family: var(--mono); font-size: 12px; color: var(--ink-faint); }
.flag-card .fdesc { font-size: 13px; color: var(--ink-dim); margin-top: 6px; line-height: 1.4; }

/* ---------- tables ---------- */
.table-wrap { overflow-x: auto; margin: 10px 0; border: 1px solid var(--line-soft); }
table.draft { border-collapse: collapse; width: 100%; font-family: var(--mono); font-size: 13px; }
table.draft th {
  text-align: left; padding: 8px 10px; color: var(--accent);
  border-bottom: 1px solid var(--line); letter-spacing: .08em; text-transform: uppercase; font-size: 11.5px;
  background: rgba(4,14,36,.8); white-space: nowrap;
}
table.draft td { padding: 7px 10px; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
table.draft tr:last-child td { border-bottom: none; }
table.draft td input { font-size: 12.5px; padding: 6px 8px; }
td.num, th.num { text-align: right; }
tr.omitted td { color: var(--ink-faint); text-decoration: line-through; }
tr.same td { color: var(--ink-dim); }
tr.diff td { color: var(--warn); }
.badge {
  font-family: var(--mono); font-size: 11px; letter-spacing: .1em; padding: 2px 8px; border: 1px solid;
}
.badge.good { color: var(--good); border-color: var(--good); }
.badge.bad { color: var(--bad); border-color: var(--bad); }
.badge.warn { color: var(--warn); border-color: var(--warn); }
.badge.dim { color: var(--ink-faint); border-color: var(--ink-faint); }

/* ---------- hex & results ---------- */
.hex {
  font-family: var(--mono); font-size: 13.5px; word-break: break-all;
  background: rgba(4,14,36,.9); border: 1px solid var(--line-soft);
  padding: 14px 16px; color: var(--accent); line-height: 1.7;
}
.hex.big { font-size: 15px; border-color: var(--line); }
.error {
  border: 1px solid var(--bad); color: var(--bad); background: rgba(80,10,20,.25);
  padding: 12px 16px; font-family: var(--mono); font-size: 14px; margin: 14px 0;
  white-space: pre-wrap;
}
.result-block { border: 1px solid var(--line); padding: 18px; margin: 16px 0; background: rgba(4,14,36,.5); }
textarea { min-height: 90px; resize: vertical; }
textarea[readonly] { color: var(--ink-dim); }

/* ---------- anatomy walk ---------- */
.ana { border: 1px solid var(--line-soft); margin: 10px 0; background: rgba(4,14,36,.55); }
.ana-head { display: flex; gap: 12px; align-items: baseline; padding: 10px 14px; cursor: pointer; }
.ana-head:hover { background: rgba(125,249,255,.05); }
.ana-idx { font-family: var(--mono); color: var(--ink-faint); font-size: 12px; min-width: 26px; }
.ana-name { font-family: var(--mono); color: var(--accent); font-weight: 700; font-size: 14px; }
.ana-method { font-family: var(--mono); font-size: 11.5px; color: var(--ink-faint); margin-left: auto; letter-spacing: .06em; }
.ana-value { font-family: var(--mono); font-size: 12.5px; color: var(--ink-dim); word-break: break-all; }
.ana-body { display: none; padding: 0 14px 14px; }
.ana.open .ana-body { display: block; }
.ana-note { color: var(--ink-dim); font-size: 14px; margin: 8px 0; max-width: 78ch; }
.ana.omitted .ana-name, .ana.omitted .ana-value { color: var(--ink-faint); text-decoration: line-through; }
.ana .hex { font-size: 12.5px; padding: 10px 12px; margin: 6px 0; }
.why { color: var(--warn); font-size: 13.5px; }

/* ---------- verdicts ---------- */
.verdict {
  font-family: var(--mono); font-size: 22px; letter-spacing: .2em; text-transform: uppercase;
  padding: 16px 22px; margin: 16px 0; border: 2px solid; display: inline-block;
}
.verdict.proven { color: var(--good); border-color: var(--good); }
.verdict.notproven { color: var(--bad); border-color: var(--bad); }
.verdict.unsealed { color: var(--warn); border-color: var(--warn); }
.vlist { font-family: var(--mono); font-size: 13.5px; margin: 10px 0; padding-left: 20px; }
.vlist li { margin: 5px 0; }
.vlist .ok { color: var(--good); } .vlist .no { color: var(--bad); } .vlist .maybe { color: var(--warn); }

/* ---------- footer ---------- */
footer {
  border-top: 2px solid var(--line); background: rgba(6,18,44,.96);
  padding: 24px 26px; color: var(--ink-dim); font-size: 14px;
}
.foot-grid { max-width: 1180px; margin: 0 auto; display: flex; gap: 30px; justify-content: space-between; flex-wrap: wrap; }
.foot-grid strong { color: var(--accent); letter-spacing: .08em; }
.attr { text-align: right; font-family: var(--mono); font-size: 13px; }
.attr a { color: var(--accent); }
.addr { color: var(--ink-faint); font-size: 12px; word-break: break-all; }

@media (max-width: 700px) {
  h1 { font-size: 22px; }
  .panel { padding: 20px 16px 26px; }
  .topbar { padding: 14px 16px; }
  main { padding: 18px 12px 44px; }
}

/* Keyboard focus: a visible ring in this app's accent on every interactive element (fleet focus-visible pass). */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* Skip link: the first Tab stop on the page — parked off-screen until keyboard focus reveals it (fleet skip-link pass). */
.skip-link { position: absolute; left: 12px; top: -64px; z-index: 1000; padding: 10px 16px; border: 2px solid var(--accent); border-radius: 8px; background: #0b0e14; color: var(--accent); font-weight: 700; text-decoration: none; transition: top .15s ease; }
.skip-link:focus-visible { top: 12px; }
main:focus { outline: none; }

/* Reduced motion: when the OS asks for reduced motion, animations and transitions finish near-instantly and scrolling is not smoothed (fleet reduced-motion pass). Near-zero durations — not animation: none — so fade-ins still land on their end state and no content can be stranded invisible. */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}