:root {
  --crimson: #9E1B32;
  --crimson-dark-bg: #D94D63;
  --charcoal: #2A2D31;
  --grey-ground: #E6E7E8;
  --grey-mid: #878C92;
  --grey-caption: #4E545A;
  --grey-caption-dark: #9CA1A7;

  --bg: #FFFFFF;
  --bg-alt: var(--grey-ground);
  --text: var(--charcoal);
  --caption: var(--grey-caption);
  --accent: var(--crimson);
  --border: var(--grey-mid);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: var(--charcoal);
    --bg-alt: #34383d;
    --text: var(--grey-ground);
    --caption: var(--grey-caption-dark);
    --accent: var(--crimson-dark-bg);
    --border: var(--grey-mid);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Archivo", Arial, sans-serif;
  line-height: 1.5;
  font-size: 1rem;
}

h1, h2, h3 {
  font-family: "Archivo", Arial, sans-serif;
  line-height: 1.2;
  margin: 0 0 0.75em;
}

p {
  margin: 0 0 1em;
}

a {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

a:hover,
a:focus-visible {
  color: var(--accent);
}

.mono {
  font-family: "IBM Plex Mono", monospace;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--bg);
  padding: 0.5em 1em;
  z-index: 100;
}

.skip-link:focus {
  left: 0;
}

section {
  scroll-margin-top: 5rem;
  padding: 3rem 1.25rem;
  max-width: 60rem;
  margin: 0 auto;
}

/* Logo lockup: the datum rule must always span the wordmark's rendered
   width, so it stretches inside a shrink-to-fit column instead of being
   pixel- or SVG-fixed. */
.logo {
  display: inline-flex;
  flex-direction: column;
  align-items: stretch;
  text-decoration: none;
}

.logo .wordmark {
  white-space: nowrap;
  font-size: clamp(1.5rem, 5vw, 2.5rem);
  color: var(--text);
}

.logo .wordmark .sure {
  font-weight: 800;
  color: var(--accent);
}

.logo .wordmark .floor {
  font-weight: 400;
}

.logo .datum {
  position: relative;
  align-self: stretch;
  height: 0.6rem;
  margin: 0.25rem 0 0.35rem;
}

.logo .datum-line {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--border);
  transform: translateY(-50%);
}

.logo .datum-tick {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.logo .datum-tick.start {
  left: 0;
}

.logo .datum-tick.mid {
  left: 50%;
  transform: translateX(-1px);
}

.logo .datum-tick.end {
  right: 0;
}

.logo .caption {
  white-space: nowrap;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--caption);
  text-transform: uppercase;
}

.logo.small .wordmark {
  font-size: 1.1rem;
}

.logo.small .caption {
  font-size: 0.55rem;
  letter-spacing: 0.15em;
}

header.site-header {
  position: sticky;
  top: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

.header-inner {
  max-width: 60rem;
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

nav.site-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin: 0;
  padding: 0;
}

nav.site-nav a {
  font-size: 0.9rem;
  text-decoration: none;
  border-bottom: 2px solid transparent;
}

nav.site-nav a:hover,
nav.site-nav a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.hero {
  text-align: center;
  padding-top: 4rem;
  padding-bottom: 4rem;
}

.hero .logo {
  margin: 0 auto 1.5rem;
}

.hero .tagline {
  font-size: 1.15rem;
  max-width: 38rem;
  margin: 0 auto 1.75rem;
  color: var(--text);
}

.cta-group {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.25rem;
  border: 2px solid var(--accent);
  border-radius: 2px;
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
  font-size: 0.95rem;
}

.btn:hover,
.btn:focus-visible {
  background: var(--accent);
  color: var(--bg);
}

section.alt {
  background: var(--bg-alt);
}

.section-label {
  font-family: "IBM Plex Mono", monospace;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-size: 0.75rem;
  color: var(--caption);
  margin-bottom: 0.5rem;
  display: block;
}

.steps {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  padding: 0;
  list-style: none;
  margin: 1.5rem 0 0;
}

.steps li {
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
}

.steps .step-number {
  font-family: "IBM Plex Mono", monospace;
  color: var(--caption);
  display: block;
  margin-bottom: 0.25rem;
}

.placeholder {
  color: var(--caption);
  font-style: italic;
}

table.test-list {
  border-collapse: collapse;
  width: 100%;
  margin-top: 1.5rem;
}

table.test-list th,
table.test-list td {
  border: 1px solid var(--border);
  padding: 0.6rem 0.75rem;
  text-align: left;
  vertical-align: top;
}

table.test-list th {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--caption);
}

.contact-details {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
  display: grid;
  gap: 0.75rem;
}

.contact-details a {
  font-size: 1.1rem;
  font-weight: 800;
}

footer.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 1.25rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--caption);
}

footer.site-footer .logo {
  margin: 0 auto 0.75rem;
}