:root {
  --bg: #f6f5f1; --panel: #ffffff; --ink: #1b1d1f; --muted: #5d6268; --line: #dedbd3;
  --ok: #1d6b3f; --ok-bg: #e3f1e8; --bad: #a12a22; --bad-bg: #f8e3e0;
  --warn: #7a5300; --warn-bg: #fbefd2; --accent: #23477a; --accent-bg: #e3eaf5;
  --code-bg: #f0eee8;
  --btn-fill: var(--accent); --btn-fill-hover: #1a3760; --btn-ink: #ffffff; --btn-line: var(--accent); --btn-text: var(--accent);
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #141618; --panel: #1c1f22; --ink: #e8e6e1; --muted: #9aa0a6; --line: #30343a;
    --ok: #7fd3a0; --ok-bg: #1b3326; --bad: #f19a92; --bad-bg: #3a1f1c;
    --warn: #f0c46b; --warn-bg: #3a2e14; --accent: #9dbbe8; --accent-bg: #1f2b3d;
    --code-bg: #24282c;
    --btn-fill: linear-gradient(135deg, #f7b267 0%, #f48629 55%, #ef6910 100%); --btn-fill-hover: linear-gradient(135deg, #f9c07f 0%, #f69440 55%, #f27a24 100%); --btn-ink: #1a1208; --btn-line: #f48629; --btn-text: #f7a04c;
  }
}
:root[data-theme="dark"] {
  --bg: #141618; --panel: #1c1f22; --ink: #e8e6e1; --muted: #9aa0a6; --line: #30343a;
  --ok: #7fd3a0; --ok-bg: #1b3326; --bad: #f19a92; --bad-bg: #3a1f1c;
  --warn: #f0c46b; --warn-bg: #3a2e14; --accent: #9dbbe8; --accent-bg: #1f2b3d;
  --code-bg: #24282c;
  --btn-fill: linear-gradient(135deg, #f7b267 0%, #f48629 55%, #ef6910 100%); --btn-fill-hover: linear-gradient(135deg, #f9c07f 0%, #f69440 55%, #f27a24 100%); --btn-ink: #1a1208; --btn-line: #f48629; --btn-text: #f7a04c;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.6 var(--sans); }
a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }
code, pre { font-family: var(--mono); font-size: 0.88em; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- chrome ---------- */
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 8px; background: var(--panel); padding: 6px 10px; z-index: 10; }
.site-header { border-bottom: 1px solid var(--line); background: var(--bg); }
.site-header .wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 22px; padding-top: 14px; padding-bottom: 14px; }
.brand { font-weight: 700; font-size: 18px; color: var(--ink); text-decoration: none; letter-spacing: -0.01em; display: inline-flex; align-items: center; gap: 8px; }
.brand img { width: 28px; height: auto; display: block; }
.brand .logo-dark { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .brand .logo-light { display: none; }
  :root:not([data-theme="light"]) .brand .logo-dark { display: block; }
}
:root[data-theme="dark"] .brand .logo-light { display: none; }
:root[data-theme="dark"] .brand .logo-dark { display: block; }
.site-nav { display: flex; flex-wrap: wrap; gap: 4px 18px; font-size: 15px; }
.site-nav a { color: var(--muted); text-decoration: none; padding: 2px 0; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--ink); }
.site-nav a[aria-current="page"] { box-shadow: inset 0 -2px 0 var(--accent); }
.theme { margin-left: auto; font: inherit; font-size: 13px; color: var(--muted); background: none; border: 1px solid var(--line); border-radius: 6px; padding: 4px 10px; cursor: pointer; }
.wrap { max-width: 1120px; margin: 0 auto; padding-left: 16px; padding-right: 16px; }
.site-footer { border-top: 1px solid var(--line); margin-top: 64px; padding: 24px 0 40px; color: var(--muted); font-size: 14px; }
.site-footer p { margin: 4px 0; }

/* ---------- home ---------- */
.hero { padding: 56px 0 40px; }
.hero h1 { font-family: var(--serif); font-size: clamp(34px, 6vw, 54px); line-height: 1.1; letter-spacing: -0.015em; margin: 0 0 18px; font-weight: 600; }
.hero p.lede { font-size: clamp(17px, 2.2vw, 20px); max-width: 44em; margin: 0 0 26px; color: var(--ink); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.button { display: inline-block; padding: 10px 18px; border-radius: 8px; border: 1px solid var(--btn-line); text-decoration: none; font-weight: 600; font-size: 15px; }
.button.primary { background: var(--btn-fill); color: var(--btn-ink); border-color: transparent; }
.button.primary:hover { background: var(--btn-fill-hover); }
.button.secondary { color: var(--btn-text); border-color: var(--btn-line); }
.button.secondary:hover { background: color-mix(in srgb, var(--btn-line) 12%, transparent); }
section.band { padding: 36px 0; border-top: 1px solid var(--line); }
section.band h2 { font-family: var(--serif); font-size: 28px; font-weight: 600; margin: 0 0 8px; letter-spacing: -0.01em; }
section.band > .wrap > p.intro { max-width: 46em; color: var(--muted); margin: 0 0 22px; }
.grid3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.grid2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
@media (max-width: 820px) { .grid3, .grid2 { grid-template-columns: minmax(0, 1fr); } }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 18px 20px; }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0 0 8px; }
.card p:last-child { margin-bottom: 0; }
.card .label { font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.notest-band { margin-top: 18px; border: 2px solid var(--warn); background: var(--warn-bg); border-radius: 10px; padding: 18px 20px; }
.notest-band h3 { margin: 0 0 6px; color: var(--warn); font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; }
.notest-band ul { margin: 6px 0 0; padding-left: 20px; }
ol.steps { counter-reset: step; list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
ol.steps li { counter-increment: step; display: grid; grid-template-columns: 40px minmax(0, 1fr); gap: 12px; align-items: start; }
ol.steps li::before { content: counter(step); width: 32px; height: 32px; border-radius: 50%; background: var(--accent-bg); color: var(--accent); font-weight: 700; display: grid; place-items: center; }
ol.steps strong { display: block; }
.status-list { margin: 0; padding-left: 20px; }
.contact { margin: 22px 0 0; max-width: 46em; }

/* ---------- documents (guide, spec) ---------- */
.doc { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 36px; padding-top: 28px; }
@media (max-width: 900px) { .doc { grid-template-columns: minmax(0, 1fr); } .doc .toc { display: none; } }
.doc .toc { position: sticky; top: 16px; align-self: start; max-height: calc(100vh - 32px); overflow: auto; font-size: 14px; }
.doc .toc ul { list-style: none; margin: 0; padding: 0; }
.doc .toc li { margin: 4px 0; }
.doc .toc li.h3 { padding-left: 12px; font-size: 13px; }
.doc .toc a { color: var(--muted); text-decoration: none; }
.doc .toc a:hover { color: var(--ink); }
.prose { max-width: 50em; }
.prose h1 { font-family: var(--serif); font-size: 36px; line-height: 1.15; margin: 0 0 16px; font-weight: 600; }
.prose h2 { font-family: var(--serif); font-size: 25px; margin: 36px 0 10px; font-weight: 600; }
.prose h3 { font-size: 18px; margin: 26px 0 8px; }
.prose code { background: var(--code-bg); padding: 1px 5px; border-radius: 4px; overflow-wrap: anywhere; }
.prose pre { background: var(--code-bg); padding: 12px 14px; border-radius: 8px; overflow-x: auto; line-height: 1.45; }
.prose pre code { background: none; padding: 0; overflow-wrap: normal; }
.prose table { border-collapse: collapse; display: block; overflow-x: auto; margin: 14px 0; font-size: 15px; }
.prose th, .prose td { border: 1px solid var(--line); padding: 6px 10px; text-align: left; vertical-align: top; }
.prose th { background: var(--code-bg); }
.prose blockquote { margin: 14px 0; padding: 4px 16px; border-left: 3px solid var(--line); color: var(--muted); }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 32px 0; }
.prose a.anchor { color: var(--line); text-decoration: none; margin-left: 6px; font-weight: 400; }
.prose :is(h2, h3):hover a.anchor { color: var(--muted); }
.doc-meta { color: var(--muted); font-size: 14px; margin: -6px 0 22px; }

/* ---------- download ---------- */
.prose .hash { font-family: var(--mono); font-size: 13px; overflow-wrap: anywhere; background: var(--code-bg); padding: 8px 10px; border-radius: 6px; display: block; }

/* ---------- verifier ---------- */
.vmain { display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 20px; padding-top: 20px; }
@media (max-width: 820px) {
  .vmain { grid-template-columns: minmax(0, 1fr); }
  .vectors { max-height: 220px; overflow-y: auto; }
}
.vhead { padding-top: 26px; }
.vhead h1 { font-family: var(--serif); font-size: 32px; margin: 0 0 4px; font-weight: 600; }
.vhead p { margin: 0; color: var(--muted); max-width: 52em; }
h2.k { font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin: 0 0 8px; font-weight: 600; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 14px; }
.vside { display: flex; flex-direction: column; gap: 16px; }
.vectors { list-style: none; margin: 0; padding: 0; }
.vectors button { all: unset; box-sizing: border-box; cursor: pointer; display: grid; grid-template-columns: 26px 1fr auto; gap: 8px; align-items: center; width: 100%; padding: 6px 8px; border-radius: 6px; font-size: 15px; }
.vectors button:hover { background: var(--code-bg); }
.vectors button[aria-current="true"] { background: var(--accent-bg); }
.vectors button:focus-visible { outline: 2px solid var(--accent); }
.num { font: 12px var(--mono); color: var(--muted); }
.pill { font: 11px/1 var(--mono); padding: 4px 6px; border-radius: 4px; white-space: nowrap; }
.pill.ok { color: var(--ok); background: var(--ok-bg); }
.pill.bad { color: var(--bad); background: var(--bad-bg); }
.pill.warn { color: var(--warn); background: var(--warn-bg); }
.drop { border: 1.5px dashed var(--line); border-radius: 8px; padding: 18px 12px; text-align: center; color: var(--muted); position: relative; }
.drop.over { border-color: var(--accent); background: var(--accent-bg); color: var(--ink); }
.drop label { color: var(--accent); cursor: pointer; text-decoration: underline; }
.drop input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.small { font-size: 13px; color: var(--muted); }
.source { display: flex; flex-wrap: wrap; gap: 8px 12px; align-items: center; margin-bottom: 14px; }
.source strong { font-size: 17px; }
.source .desc { flex-basis: 100%; color: var(--muted); }
.tiles { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-bottom: 14px; }
@media (max-width: 560px) { .tiles { grid-template-columns: minmax(0, 1fr); } }
.tile { border-radius: 10px; padding: 12px 14px; border: 1px solid var(--line); background: var(--panel); }
.tile .label { font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.tile .value { font-size: 20px; font-weight: 650; margin-top: 2px; }
.tile .sub { font-size: 13px; color: var(--muted); }
.tile.ok { border-color: var(--ok); } .tile.ok .value { color: var(--ok); }
.tile.bad { border-color: var(--bad); } .tile.bad .value { color: var(--bad); }
.tile.warn { border-color: var(--warn); } .tile.warn .value { color: var(--warn); }
section.panel { margin-bottom: 14px; }
.failures { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.failures li { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 10px; align-items: baseline; font-size: 15px; }
.failures code { font-size: 12px; color: var(--bad); background: var(--bad-bg); padding: 2px 6px; border-radius: 4px; }
@media (max-width: 480px) { .failures li { grid-template-columns: minmax(0, 1fr); gap: 2px; } .failures code { justify-self: start; } }
dl.record { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 4px 16px; margin: 0; font-size: 15px; }
dl.record dt { color: var(--muted); } dl.record dd { margin: 0; overflow-wrap: anywhere; }
.mono { font-family: var(--mono); font-size: 13px; }
.notest { border: 2px solid var(--warn); background: var(--warn-bg); border-radius: 10px; padding: 12px 14px; margin-bottom: 14px; }
.notest h2 { color: var(--warn); }
.notest p { margin: 0 0 6px; font-size: 14px; }
.notest ul { margin: 0; padding-left: 18px; }
.notes ul { margin: 0; padding-left: 18px; color: var(--muted); font-size: 14px; }
.cheat textarea { width: 100%; min-height: 260px; font: 12.5px/1.45 var(--mono); background: var(--code-bg); color: var(--ink); border: 1px solid var(--line); border-radius: 6px; padding: 10px; resize: vertical; }
.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 8px 0; }
.vmain select, .vmain button.btn, .vmain input[type="number"] { font: inherit; font-size: 14px; color: var(--ink); background: var(--panel); border: 1px solid var(--line); border-radius: 6px; padding: 6px 10px; }
.vmain select { max-width: 100%; }
.vmain button.btn { cursor: pointer; }
.vmain button.btn.primary { background: var(--btn-fill); color: var(--btn-ink); border-color: transparent; font-weight: 600; }
.vmain button.btn.primary:hover { background: var(--btn-fill-hover); }
.vmain button.btn:disabled { opacity: 0.5; cursor: default; }
.vmain input[type="number"] { width: 64px; }
.empty { color: var(--muted); padding: 40px 0; text-align: center; }
.error { color: var(--bad); background: var(--bad-bg); padding: 10px 12px; border-radius: 8px; margin-bottom: 14px; }