/* uskillbotics.com — one stylesheet for every page. No web fonts, no scripts, nothing fetched from
   anywhere else: a privacy policy should not be the page that tells a third party you read it. */

:root {
  color-scheme: light dark;
  --bg: #fafafd;
  --panel: #f1f1f8;
  --ink: #191928;
  --muted: #535366;
  --hairline: #dddde5;
  --accent: #007852;
  --accent-ink: #ffffff;
  --mark: #e8f7f0;
  --measure: 44rem;
  --gutter: 16px;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #060613;
    --panel: #141327;
    --ink: #edeef5;
    --muted: #adaac6;
    --hairline: #27263c;
    --accent: #37e4aa;
    --accent-ink: #062018;
    --mark: #0f2a22;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.6 system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  overflow-wrap: break-word;
}

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

a:hover {
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip {
  position: absolute;
  left: -999px;
}

.skip:focus {
  left: var(--gutter);
  top: 8px;
  background: var(--panel);
  padding: 6px 10px;
}

/* --- Header and footer ----------------------------------------------------------------------- */

.site-header,
.site-footer,
main {
  max-width: var(--measure);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
  padding-top: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--hairline);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.brand small {
  display: block;
  font-weight: 500;
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: lowercase;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin-left: auto;
  font-size: 0.95rem;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current='page'] {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
}

.site-footer {
  margin-top: 56px;
  padding-top: 20px;
  padding-bottom: 40px;
  border-top: 1px solid var(--hairline);
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin-bottom: 8px;
}

.site-footer a {
  color: var(--muted);
}

/* --- Documents ------------------------------------------------------------------------------- */

main {
  padding-top: 32px;
}

h1 {
  font-size: 2rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
}

h2 {
  font-size: 1.3rem;
  line-height: 1.3;
  margin: 40px 0 8px;
  padding-top: 8px;
  scroll-margin-top: 16px;
}

h3 {
  font-size: 1.05rem;
  margin: 28px 0 4px;
  scroll-margin-top: 16px;
}

p,
ul,
ol {
  margin: 0 0 14px;
}

li + li {
  margin-top: 6px;
}

.meta {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

.lead {
  font-size: 1.1rem;
}

.summary {
  background: var(--panel);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 18px 20px 6px;
  margin: 24px 0 8px;
}

.summary h2 {
  margin-top: 0;
  padding-top: 0;
  font-size: 1.05rem;
}

.toc {
  font-size: 0.95rem;
  margin: 24px 0;
}

.toc ol {
  padding-left: 1.4em;
  columns: 2 14rem;
  column-gap: 2rem;
}

.toc li {
  break-inside: avoid;
}

.path {
  font-weight: 600;
  white-space: normal;
}

.contact {
  display: inline-block;
  font-weight: 600;
  font-size: 1.05rem;
  padding: 10px 14px;
  margin: 4px 0 14px;
  background: var(--mark);
  border-radius: var(--radius);
  word-break: break-all;
}

/* Data tables collapse into cards on a phone, so nothing scrolls sideways. */
.data {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0 20px;
  font-size: 0.95rem;
}

.data th,
.data td {
  text-align: left;
  vertical-align: top;
  padding: 10px 12px 10px 0;
  border-bottom: 1px solid var(--hairline);
}

.data th {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}

@media (max-width: 640px) {
  .data thead {
    display: none;
  }

  .data tr {
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid var(--hairline);
  }

  .data td {
    display: block;
    padding: 2px 0;
    border: 0;
  }

  .data td::before {
    content: attr(data-label);
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--muted);
    margin-top: 6px;
  }

  .data td:first-child::before {
    margin-top: 0;
  }

  .data td:first-child {
    font-weight: 600;
  }
}

details {
  border-bottom: 1px solid var(--hairline);
  padding: 10px 0;
}

details summary {
  cursor: pointer;
  font-weight: 600;
}

details[open] summary {
  margin-bottom: 8px;
}

/* --- Landing pages --------------------------------------------------------------------------- */

.hero {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
  margin: 8px 0 24px;
}

.hero img {
  width: 96px;
  height: 96px;
  border-radius: 22px;
  box-shadow: 0 1px 0 var(--hairline);
}

.hero h1 {
  margin: 0;
}

.hero p {
  margin: 4px 0 0;
  color: var(--muted);
}

.button {
  display: inline-block;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 700;
  text-decoration: none;
  padding: 10px 18px;
  border-radius: 999px;
}

.button:hover {
  text-decoration: none;
  filter: brightness(1.08);
}

.links {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 12px;
}

.links li + li {
  margin-top: 0;
}

.links a {
  display: block;
  height: 100%;
  padding: 14px 16px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--ink);
  text-decoration: none;
}

.links a:hover {
  border-color: var(--accent);
}

.links strong {
  display: block;
  color: var(--accent);
}

.links span {
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 480px) {
  body {
    font-size: 16px;
  }

  h1 {
    font-size: 1.7rem;
  }

  .site-nav {
    margin-left: 0;
  }
}