:root {
  --paper: #eef1ee;
  --surface: #ffffff;
  --ink: #18211d;
  --ink-soft: #4d5a54;
  --line: #cfd8d2;
  --accent: #2447c9;
  --accent-ink: #ffffff;
  --good: #1f7a4a;
  --good-bg: #e3f2e9;
  --bad: #b02a22;
  --bad-bg: #f8e3e1;
  --unknown: #7a5d08;
  --unknown-bg: #f6eed4;
  --focus: #2447c9;

  --sans: ui-sans-serif, "Segoe UI Variable Text", "Segoe UI", -apple-system, "Helvetica Neue", Arial, sans-serif;
  --serif: "Iowan Old Style", "Charter", "Bitstream Charter", "Sitka Text", Cambria, Georgia, serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #131916;
    --surface: #1b2420;
    --ink: #e4ebe7;
    --ink-soft: #9fb0a8;
    --line: #2f3c36;
    --accent: #8da2ff;
    --accent-ink: #0e1430;
    --good: #6fd29b;
    --good-bg: #17301f;
    --bad: #ff8f86;
    --bad-bg: #3a1a18;
    --unknown: #e6c766;
    --unknown-bg: #322a12;
    --focus: #8da2ff;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.55 var(--sans);
}

main {
  max-width: 44rem;
  margin: 0 auto;
  padding: 3.5rem 1rem 4rem;
}

a { color: var(--accent); }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

/* intro ---------------------------------------------------------------- */

/* top bar: wordmark + GitHub ------------------------------------------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin: 0 0 3rem;
}

.wordmark {
  display: inline-flex;
  align-items: baseline;
  font: 700 clamp(1.9rem, 5vw, 2.4rem)/1 var(--mono);
  letter-spacing: -0.04em;
  color: var(--ink);
  text-decoration: none;
}

.wordmark .wm-2 {
  display: inline-block;
  margin: 0 0.06em;
  padding: 0.04em 0.14em 0.06em;
  border-radius: 0.14em;
  background: var(--accent);
  color: var(--accent-ink);
  transform: translateY(-0.04em) rotate(-6deg);
}

.wordmark .wm-scan { color: var(--accent); }

.wordmark:hover .wm-2 { transform: translateY(-0.04em) rotate(0deg); }

@media (prefers-reduced-motion: no-preference) {
  .wordmark .wm-2 { transition: transform 0.2s ease; }
}

.gh {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-weight: 600;
  font-size: 0.925rem;
  color: var(--ink);
  text-decoration: none;
  padding: 0.45rem 0.75rem;
  border: 1.5px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
}

.gh:hover { border-color: var(--ink-soft); }

.lede a { color: var(--accent); text-underline-offset: 0.15em; white-space: nowrap; }

h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(2rem, 6vw, 3rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0 0 1rem;
  max-width: 16em;
}

.lede {
  margin: 0 0 2.25rem;
  color: var(--ink-soft);
  max-width: 36em;
}

/* form ------------------------------------------------------------------ */

.field-label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.field-row {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

#host {
  flex: 1 1 16rem;
  min-width: 0;
  font: 500 1.35rem/1.2 var(--mono);
  color: var(--ink);
  background: var(--surface);
  border: 2px solid var(--line);
  border-radius: 6px;
  padding: 0.8rem 0.9rem;
}

#host:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent); }

#host::placeholder { color: color-mix(in srgb, var(--ink-soft) 60%, transparent); }

button {
  font: 600 1rem/1 var(--sans);
  color: var(--accent-ink);
  background: var(--accent);
  border: 0;
  border-radius: 6px;
  padding: 0 1.4rem;
  min-height: 3.3rem;
  cursor: pointer;
}

button:hover { filter: brightness(1.08); }
button[disabled] { opacity: 0.6; cursor: progress; }

.consent {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  margin: 1rem 0 0.4rem;
  cursor: pointer;
}

.consent input {
  width: 1.15rem;
  height: 1.15rem;
  margin: 0.2rem 0 0;
  accent-color: var(--accent);
  flex: none;
}

.fineprint {
  margin: 0;
  font-size: 0.875rem;
  color: var(--ink-soft);
}

.warning {
  margin: 0.6rem 0 0;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink);
}

.form-error {
  margin: 0.9rem 0 0;
  padding: 0.7rem 0.9rem;
  border-radius: 6px;
  background: var(--bad-bg);
  color: var(--bad);
  font-weight: 500;
}

/* result ----------------------------------------------------------------- */

#result {
  margin-top: 3rem;
  padding-top: 2.5rem;
  border-top: 2px solid var(--ink);
}

.verdict {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.6rem, 4.6vw, 2.35rem);
  line-height: 1.18;
  margin: 0 0 1.75rem;
  overflow-wrap: anywhere;
}

.verdict .host { font-family: var(--mono); font-weight: 500; font-size: 0.82em; }

.status {
  border-left: 5px solid;
  border-radius: 0 6px 6px 0;
  padding: 0.85rem 1rem;
  margin: 0 0 2rem;
}

.status p { margin: 0; }
.status strong { display: block; margin-bottom: 0.2rem; }
.status.good { border-color: var(--good); background: var(--good-bg); }
.status.good strong { color: var(--good); }
.status.bad { border-color: var(--bad); background: var(--bad-bg); }
.status.bad strong { color: var(--bad); }
.status.unknown { border-color: var(--unknown); background: var(--unknown-bg); }
.status.unknown strong { color: var(--unknown); }

#result h2,
footer h2 {
  font-size: 1rem;
  font-weight: 700;
  margin: 2rem 0 0.6rem;
}

dl.facts {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.35rem 1.25rem;
  margin: 0;
}

dl.facts dt { color: var(--ink-soft); }
dl.facts dd { margin: 0; overflow-wrap: anywhere; }
dl.facts dd.code { font-family: var(--mono); font-size: 0.92em; }

ul.plain {
  margin: 0;
  padding-left: 1.2rem;
}

ul.plain li { margin: 0.2rem 0; overflow-wrap: anywhere; }

.meta {
  margin-top: 2rem;
  font-size: 0.875rem;
  color: var(--ink-soft);
}

/* footer ----------------------------------------------------------------- */

footer {
  margin-top: 4.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.925rem;
}

footer h2 { color: var(--ink); margin-top: 1.5rem; }
footer h2:first-child { margin-top: 0; }
footer p { margin: 0; max-width: 40em; }

/* loading ---------------------------------------------------------------- */

.checking {
  font-family: var(--serif);
  font-size: 1.5rem;
  margin: 0;
}

.checking::after {
  content: "";
  display: inline-block;
  width: 0.55em;
  height: 0.55em;
  margin-left: 0.5em;
  border: 2px solid var(--accent);
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
  vertical-align: 0.05em;
}

@keyframes spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  .checking::after { animation: none; border-right-color: var(--accent); }
}

@media (max-width: 30rem) {
  main { padding-top: 2rem; }
  button { width: 100%; }
  dl.facts { grid-template-columns: 1fr; gap: 0 0; }
  dl.facts dd { margin-bottom: 0.6rem; }
}