:root {
  --paper: #f5f7f5;
  --surface: #ffffff;
  --sunken: #edf1ee;
  --ink: #17211e;
  --muted: #56645f;
  --line: #d8dfdb;
  --accent: #1c5a68;
  --accent-ink: #ffffff;
  --accent-soft: #e2eef0;
  --caution-bg: #fbf3d9;
  --caution-ink: #6a4b06;
  --caution-line: #e7d28e;
  --ok: #2d7a4d;
  --ok-soft: #e3f2e8;
  --warn: #9a5f12;
  --warn-soft: #fbefd9;
  --bad: #ac3636;
  --bad-soft: #f9e4e2;
  --code-bg: #eef2f0;

  --f-display: "Spectral", Georgia, "Times New Roman", serif;
  --f-body: "Public Sans", -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --r: 6px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --paper: #101615;
    --surface: #17201e;
    --sunken: #1c2624;
    --ink: #e3ebe7;
    --muted: #9aa9a3;
    --line: #2b3835;
    --accent: #72b6c4;
    --accent-ink: #0d1716;
    --accent-soft: #19343a;
    --caution-bg: #2e2712;
    --caution-ink: #ecd48f;
    --caution-line: #574813;
    --ok: #74c794;
    --ok-soft: #173123;
    --warn: #e4ae5e;
    --warn-soft: #33260f;
    --bad: #ee8b83;
    --bad-soft: #3a1b19;
    --code-bg: #1c2624;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #101615;
  --surface: #17201e;
  --sunken: #1c2624;
  --ink: #e3ebe7;
  --muted: #9aa9a3;
  --line: #2b3835;
  --accent: #72b6c4;
  --accent-ink: #0d1716;
  --accent-soft: #19343a;
  --caution-bg: #2e2712;
  --caution-ink: #ecd48f;
  --caution-line: #574813;
  --ok: #74c794;
  --ok-soft: #173123;
  --warn: #e4ae5e;
  --warn-soft: #33260f;
  --bad: #ee8b83;
  --bad-soft: #3a1b19;
  --code-bg: #1c2624;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.6;
}
[hidden] { display: none !important; }
a { color: var(--accent); }
button { font: inherit; color: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
h1, h2, h3 { text-wrap: balance; }

/* ---------- Top bar ---------- */
.topbar {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; border-radius: var(--r); background: var(--accent); color: var(--accent-ink); }
.brand-name { font-family: var(--f-display); font-weight: 600; font-size: 1.2rem; letter-spacing: 0.005em; }
.nav-toggle { display: none; border: 1px solid var(--line); background: var(--surface); border-radius: var(--r); padding: 6px 12px; font-size: 0.9rem; }

/* ---------- Attribution band and footer ---------- */
.credits { background: var(--surface); border-bottom: 1px solid var(--line); padding: 12px 20px 14px; }
.credits-inner { max-width: 1200px; margin: 0 auto; display: flex; flex-direction: column; gap: 4px; }
.credits p { margin: 0; font-size: 0.85rem; line-height: 1.5; }
.credit-line { color: var(--muted); }
.credit-lbl { font-weight: 600; color: var(--ink); }
.email { user-select: all; overflow-wrap: anywhere; }
.credits .notice {
  margin-top: 8px;
  padding: 8px 12px;
  background: var(--caution-bg);
  color: var(--caution-ink);
  border: 1px solid var(--caution-line);
  border-radius: var(--r);
}
.credits .apps { margin-top: 4px; }
.apps a, .sw-apps a { font-weight: 600; }
.sw-apps { margin-top: 14px; }
.site-foot { border-top: 1px solid var(--line); background: var(--surface); padding: 20px 20px 28px; }
.site-foot p { margin: 0; font-size: 0.85rem; line-height: 1.5; color: var(--muted); }

/* ---------- Layout ---------- */
.layout {
  display: grid;
  grid-template-columns: 290px minmax(0, 1fr);
  max-width: 1200px;
  margin: 0 auto;
}
.sidebar {
  position: sticky;
  top: calc(env(safe-area-inset-top, 0px) + 59px);
  align-self: start;
  max-height: calc(100vh - 59px);
  overflow-y: auto;
  padding: 24px 20px 40px;
  border-right: 1px solid var(--line);
}
.search-label { display: block; font-size: 0.75rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
#search {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-size: 0.95rem;
}
.catalogue { margin-top: 20px; display: flex; flex-direction: column; gap: 18px; }
.cat-group h3 { margin: 0 0 6px; font-family: var(--f-body); font-size: 0.72rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.cat-group ul { list-style: none; margin: 0; padding: 0; }
.cat-group a { display: block; padding: 4px 10px; margin-left: -10px; border-radius: var(--r); color: var(--ink); text-decoration: none; font-size: 0.92rem; line-height: 1.4; }
.cat-group a:hover { background: var(--sunken); }
.cat-group a[aria-current="page"] { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.empty { color: var(--muted); font-size: 0.9rem; }

.main { padding: 36px 40px 80px; min-width: 0; outline: none; }
.main > * { max-width: 760px; }

.eyebrow { margin: 0 0 8px; font-size: 0.75rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); }

/* ---------- Buttons ---------- */
.primary { border: 0; border-radius: var(--r); background: var(--accent); color: var(--accent-ink); padding: 10px 16px; font-weight: 600; font-size: 0.95rem; }
.primary:hover { filter: brightness(1.08); }
.ghost { border: 1px solid var(--line); background: var(--surface); border-radius: var(--r); padding: 8px 14px; font-size: 0.92rem; color: var(--ink); }
.ghost:hover { border-color: var(--accent); color: var(--accent); }
.ghost.small { padding: 5px 10px; font-size: 0.85rem; }

/* ---------- Wizard ---------- */
.wiz-head { margin-bottom: 20px; }
.wiz-intro { margin: 0; color: var(--muted); max-width: 62ch; }
.trail { list-style: none; margin: 0 0 16px; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.trail-btn {
  width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 16px;
  align-items: baseline;
  text-align: left;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--sunken);
}
.trail-btn:hover { border-color: var(--accent); }
.trail-q { color: var(--muted); font-size: 0.85rem; }
.trail-a { font-weight: 600; font-size: 0.88rem; text-align: right; }
.qcard { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 28px; }
.stepper { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 12px; }
.pips { display: flex; gap: 4px; }
.pip { width: 22px; height: 6px; border-radius: 3px; background: var(--line); }
.pip.done { background: var(--accent); }
.pip.now { background: var(--accent); opacity: 0.55; }
.pip.todo { background: transparent; box-shadow: inset 0 0 0 1px var(--line); }
.step { margin: 0; font-family: var(--f-mono); font-size: 0.8rem; color: var(--muted); }
.qcard h2 { margin: 4px 0 8px; font-family: var(--f-display); font-weight: 600; font-size: 1.7rem; line-height: 1.25; }
.qhelp { margin: 0 0 4px; color: var(--muted); max-width: 64ch; }
.options { display: flex; flex-direction: column; gap: 10px; margin-top: 20px; }
.opt {
  display: flex;
  flex-direction: column;
  gap: 2px;
  text-align: left;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--paper);
  transition: border-color 0.15s, background 0.15s;
}
.opt:hover { border-color: var(--accent); background: var(--accent-soft); }
.opt-label { font-weight: 600; }
.opt-sub { font-size: 0.88rem; color: var(--muted); }
.wiz-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.wiz-actions:empty { display: none; }

/* ---------- Test page ---------- */
.test-head h1 { margin: 0; font-family: var(--f-display); font-weight: 600; font-size: 2.3rem; line-height: 1.15; }
.lede { font-size: 1.12rem; margin: 10px 0 20px; max-width: 62ch; }
.facts { display: grid; grid-template-columns: 1fr 1fr; gap: 0; margin: 0; border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); }
.facts > div { padding: 14px 16px; }
.facts > div + div { border-left: 1px solid var(--line); }
.facts dt { font-size: 0.72rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin-bottom: 4px; }
.facts dd { margin: 0; font-size: 0.95rem; }

/* Calculate it: links to the web apps */
.calc { margin-top: 20px; padding: 18px 20px; border: 1px solid var(--accent); border-radius: 10px; background: var(--accent-soft); }
.calc h2 { margin: 0 0 4px; font-family: var(--f-display); font-weight: 600; font-size: 1.3rem; }
.calc-note { margin: 0 0 12px; font-size: 0.92rem; color: var(--muted); max-width: 66ch; }
.calc-none { border-color: var(--line); background: var(--surface); }
.calc-none .calc-note { margin-bottom: 0; }
.calc-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.calc-item {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  grid-template-areas: "btn where" "btn how";
  gap: 2px 16px;
  align-items: start;
  padding: 12px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r);
}
.calc-btn {
  grid-area: btn;
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 12px;
  border-radius: var(--r);
  background: var(--accent); color: var(--accent-ink);
  font-weight: 600; font-size: 0.92rem; text-decoration: none; text-align: center; white-space: nowrap;
}
.calc-btn:hover { filter: brightness(1.08); }
.calc-where { grid-area: where; font-size: 0.95rem; }
.calc-where .lbl { display: inline; margin-right: 6px; }
.calc-how { grid-area: how; margin: 0; font-size: 0.9rem; color: var(--muted); }
.linklike { border: 0; background: none; padding: 0; color: var(--accent); text-decoration: underline; font: inherit; }

.jump {
  position: sticky;
  top: calc(env(safe-area-inset-top, 0px) + 59px);
  z-index: 5;
  display: flex;
  gap: 4px;
  overflow-x: auto;
  margin: 24px 0 0;
  padding: 8px 0;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  scrollbar-width: none;
}
.jump button { flex: none; border: 0; background: none; padding: 6px 10px; border-radius: var(--r); font-size: 0.88rem; color: var(--muted); }
.jump button:hover { background: var(--sunken); color: var(--ink); }

.sec { padding-top: 32px; scroll-margin-top: 120px; }
.sec h2 { margin: 0 0 10px; font-family: var(--f-display); font-weight: 600; font-size: 1.45rem; }
.sec p { max-width: 66ch; }
.sec-d > summary { list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.sec-d > summary::-webkit-details-marker { display: none; }
.sec-d > summary h2 { margin: 0 0 10px; }
.sec-d > summary::after {
  content: "Hide";
  flex: none;
  margin-bottom: 10px;
  padding: 2px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.78rem;
  color: var(--muted);
}
.sec-d:not([open]) > summary::after { content: "Show"; }
.sec-d:not([open]) > summary h2 { color: var(--muted); }
.sec-d > summary:hover::after { border-color: var(--accent); color: var(--accent); }
.sec-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 8px 16px; }
.sec-note { color: var(--muted); font-size: 0.92rem; margin-top: 0; }

.yourpath { margin-top: 16px; padding: 16px 18px; background: var(--accent-soft); border-radius: var(--r); }
.yourpath h3 { margin: 0 0 8px; font-size: 0.8rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); }
.yourpath ol { margin: 0 0 12px; padding-left: 20px; display: flex; flex-direction: column; gap: 6px; }
.yp-q { color: var(--muted); font-size: 0.9rem; }
.yp-a { display: block; font-weight: 600; font-size: 0.95rem; }

/* Tally pill */
.tally { margin: 0; padding: 3px 10px; border-radius: 999px; font-size: 0.82rem; font-weight: 600; background: var(--sunken); color: var(--muted); font-variant-numeric: tabular-nums; }
.tally.is-ok { background: var(--ok-soft); color: var(--ok); }
.tally.is-warn { background: var(--warn-soft); color: var(--warn); }
.tally.is-bad { background: var(--bad-soft); color: var(--bad); }

/* Checklist */
.checklist { list-style: none; margin: 16px 0 0; padding: 0; display: flex; flex-direction: column; gap: 10px; counter-reset: chk; }
.chk {
  counter-increment: chk;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 4px solid var(--line);
  border-radius: var(--r);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.chk[data-state="met"] { border-left-color: var(--ok); }
.chk[data-state="not"] { border-left-color: var(--bad); }
.chk[data-state="unsure"] { border-left-color: var(--warn); }
.chk-top { display: flex; gap: 10px; align-items: flex-start; }
.chk-mark {
  flex: none;
  width: 22px; height: 22px;
  margin-top: 1px;
  border-radius: 50%;
  display: grid; place-items: center;
  font-family: var(--f-mono);
  font-size: 0.72rem;
  background: var(--sunken);
  color: var(--muted);
}
.chk-mark::before { content: counter(chk); }
.chk[data-state="met"] .chk-mark { background: var(--ok); color: var(--surface); }
.chk[data-state="met"] .chk-mark::before { content: "✓"; }
.chk[data-state="not"] .chk-mark { background: var(--bad); color: var(--surface); }
.chk[data-state="not"] .chk-mark::before { content: "✕"; }
.chk[data-state="unsure"] .chk-mark { background: var(--warn); color: var(--surface); }
.chk[data-state="unsure"] .chk-mark::before { content: "?"; }
.chk-t { margin: 0; font-weight: 600; }
.chk-how, .chk-fail { margin: 0; font-size: 0.92rem; padding-left: 32px; }
.chk-how { color: var(--muted); }
.lbl { display: block; font-size: 0.7rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin-bottom: 1px; }
.chk-fail { background: var(--sunken); border-radius: var(--r); padding: 10px 12px; margin-left: 32px; }
.chk[data-state="not"] .chk-fail { background: var(--bad-soft); }
.chk[data-state="not"] .chk-fail .lbl { color: var(--bad); }
.chk[data-state="unsure"] .chk-fail { background: var(--warn-soft); }
.chk[data-state="unsure"] .chk-fail .lbl { color: var(--warn); }
.altlink { display: inline-block; margin-top: 4px; font-weight: 600; }
.seg { display: inline-flex; align-self: flex-start; margin-left: 32px; border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; }
.seg button { border: 0; background: var(--surface); padding: 5px 12px; font-size: 0.85rem; color: var(--muted); }
.seg button + button { border-left: 1px solid var(--line); }
.seg button:hover { color: var(--ink); background: var(--sunken); }
.seg button[aria-checked="true"][data-v="met"] { background: var(--ok); color: var(--surface); }
.seg button[aria-checked="true"][data-v="not"] { background: var(--bad); color: var(--surface); }
.seg button[aria-checked="true"][data-v="unsure"] { background: var(--warn); color: var(--surface); }
.chk-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 16px; }
.copy-msg { font-size: 0.88rem; color: var(--muted); }
.copy-fallback { width: 100%; min-height: 140px; margin-top: 10px; font-family: var(--f-mono); font-size: 0.8rem; background: var(--code-bg); color: var(--ink); border: 1px solid var(--line); border-radius: var(--r); padding: 10px; }
.universal { margin-top: 18px; border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); }
.universal summary { padding: 12px 16px; font-weight: 600; cursor: pointer; }
.universal ul { margin: 0; padding: 0 16px 14px 36px; display: flex; flex-direction: column; gap: 8px; font-size: 0.92rem; }

/* Pitfalls: highlighter treatment */
.pitfalls { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.pitfalls li {
  position: relative;
  padding: 10px 14px 10px 40px;
  background: var(--caution-bg);
  color: var(--caution-ink);
  border: 1px solid var(--caution-line);
  border-radius: var(--r);
  font-size: 0.95rem;
}
.pitfalls li::before {
  content: "!";
  position: absolute; left: 12px; top: 10px;
  width: 18px; height: 18px;
  display: grid; place-items: center;
  border-radius: 50%;
  border: 1.5px solid currentColor;
  font-weight: 700; font-size: 0.72rem; line-height: 1;
}

.steps { margin: 0; padding-left: 22px; display: flex; flex-direction: column; gap: 8px; max-width: 66ch; }
.steps li::marker { font-family: var(--f-mono); color: var(--accent); font-size: 0.9em; }

.report {
  margin: 0;
  padding: 16px 20px;
  border-left: 3px solid var(--accent);
  background: var(--surface);
  font-family: var(--f-display);
  font-size: 1.08rem;
  line-height: 1.55;
  font-variant-numeric: tabular-nums;
}

.sw { margin: 0; display: flex; flex-direction: column; gap: 10px; }
.sw > div { display: grid; grid-template-columns: 90px minmax(0, 1fr); gap: 12px; align-items: start; }
.sw dt { font-weight: 600; font-size: 0.88rem; padding-top: 8px; }
.sw dd { margin: 0; min-width: 0; }
.sw pre { margin: 0; overflow-x: auto; background: var(--code-bg); border-radius: var(--r); padding: 8px 12px; }
.sw code { font-family: var(--f-mono); font-size: 0.8rem; line-height: 1.55; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); text-decoration: none; font-size: 0.88rem; }
.chip:hover { border-color: var(--accent); }

.test-foot { margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--line); display: flex; flex-direction: column; align-items: flex-start; gap: 12px; }
.disclaimer { margin: 0; color: var(--muted); font-size: 0.85rem; max-width: 60ch; }

/* ---------- Narrow screens ---------- */
@media (max-width: 860px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .nav-toggle { display: inline-block; }
  .sidebar {
    display: none;
    position: static;
    max-height: none;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    background: var(--surface);
    padding: 16px;
  }
  body.nav-open .sidebar { display: block; }
  .main { padding: 24px 16px 60px; }
  .topbar { padding: 10px 16px; }
  .brand-name { font-size: 1.02rem; line-height: 1.2; }
  .credits, .site-foot { padding-left: 16px; padding-right: 16px; }
  .qcard { padding: 20px 16px; }
  .qcard h2 { font-size: 1.4rem; }
  .test-head h1 { font-size: 1.8rem; }
  .facts { grid-template-columns: 1fr; }
  .calc { padding: 16px 14px; }
  .calc-item { grid-template-columns: minmax(0, 1fr); grid-template-areas: "where" "how" "btn"; gap: 6px; }
  .calc-btn { justify-self: start; margin-top: 4px; }
  .facts > div + div { border-left: 0; border-top: 1px solid var(--line); }
  .trail-btn { grid-template-columns: 1fr; }
  .trail-a { text-align: left; }
  .sw > div { grid-template-columns: 1fr; gap: 4px; }
  .sw dt { padding-top: 0; }
  .chk-how, .chk-fail, .seg { margin-left: 0; padding-left: 0; }
  .chk-fail { padding: 10px 12px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}