:root {
  color-scheme: light dark;
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --border: #cbd5e1;
  --link: #0f766e;
  --link-hover: #115e59;
  --focus: #1d4ed8;
  --teal: #0f766e;
  --teal-hover: #115e59;
  --teal-accent: #0d9488;
  --indigo: #4f46e5;
  --indigo-hover: #4338ca;
  --indigo-accent: #4f46e5;
  --code-bg: #e2e8f0;
  --radius: 0.75rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --surface: #111827;
    --text: #e5e7eb;
    --muted: #a3adbd;
    --border: #334155;
    --link: #5eead4;
    --link-hover: #99f6e4;
    --focus: #93c5fd;
    --teal-accent: #2dd4bf;
    --indigo-accent: #818cf8;
    --code-bg: #1f2937;
  }
}

@media (prefers-contrast: more) {
  :root {
    --muted: var(--text);
    --border: currentColor;
  }
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  font-size: 1.0625rem;
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1 0 auto; min-width: 0; padding-block: 2rem 3rem; }
body, .wrap, .prose { overflow-wrap: break-word; }
main:focus { outline: none; }

.wrap { width: min(100% - 2rem, 64rem); margin-inline: auto; }
.prose { width: min(100% - 2rem, 46rem); margin-inline: auto; }

h1, h2, h3 { line-height: 1.25; margin: 2rem 0 0.75rem; }
h1 { font-size: clamp(1.9rem, 1.2rem + 3vw, 2.75rem); margin-top: 0; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.2rem; }
p, ul, ol { margin: 0 0 1rem; }
ul, ol { padding-inline-start: 1.5rem; }
li { margin-bottom: 0.35rem; }
hr { border: 0; border-top: 1px solid var(--border); margin: 2rem 0; }
strong { font-weight: 650; }

code {
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 0.92em;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 0.25rem;
  direction: ltr;
  unicode-bidi: isolate;
  overflow-wrap: anywhere;
}

a { color: var(--link); }
a:hover { color: var(--link-hover); }
main a:not(.btn) { text-decoration: underline; text-underline-offset: 0.2em; }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 0.25rem;
}

.skip-link {
  position: absolute;
  inset-inline-start: 0.5rem;
  top: -4rem;
  z-index: 10;
  background: var(--surface);
  color: var(--text);
  padding: 0.75rem 1rem;
  border: 2px solid var(--text);
  border-radius: 0.5rem;
}
.skip-link:focus { top: 0.5rem; }

.site-header { border-bottom: 1px solid var(--border); background: var(--surface); }
.header-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.25rem 1.5rem; }
.brand {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text);
  text-decoration: none;
}
.brand:hover { color: var(--text); }
.nav-list, .footer-list { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0 1.25rem; }
.nav-list li, .footer-list li { margin: 0; }
.nav-list a, .footer-list a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  color: var(--text);
  text-decoration: none;
}
.nav-list a:hover, .footer-list a:hover { text-decoration: underline; color: var(--text); }
.nav-list a[aria-current="page"] { font-weight: 700; text-decoration: underline; text-underline-offset: 0.3em; }

.site-footer { border-top: 1px solid var(--border); background: var(--surface); padding-block: 1.25rem; }
.footer-note { margin: 0.5rem 0 0; color: var(--muted); font-size: 0.95rem; }

.lead { font-size: 1.25rem; color: var(--muted); max-width: 40rem; }
.hero { padding-block: 1.5rem 1rem; }

.cards { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr)); }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.25rem 0.5rem;
}
.card h3 { margin-top: 0; }
.card--linkshield { border-top: 0.375rem solid var(--teal-accent); }
.card--safescan { border-top: 0.375rem solid var(--indigo-accent); }
.status { color: var(--muted); font-size: 0.95rem; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  max-width: 100%;
  padding: 0.5rem 1rem;
  overflow-wrap: anywhere;
  border: 2px solid transparent;
  border-radius: 0.5rem;
  font-weight: 650;
  text-decoration: none;
  color: #ffffff;
  text-align: center;
}
.btn:hover { color: #ffffff; }
.btn--teal { background: var(--teal); }
.btn--teal:hover { background: var(--teal-hover); }
.btn--indigo { background: var(--indigo); }
.btn--indigo:hover { background: var(--indigo-hover); }
.btn--outline { background: transparent; color: var(--text); border-color: var(--text); }
.btn--outline:hover { background: var(--code-bg); color: var(--text); }
.btn-row { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-bottom: 1rem; }

.principles { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr)); }
.principle { border-inline-start: 0.25rem solid var(--border); padding-inline-start: 1rem; }
.principle h3 { margin-top: 0; }

.callout {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin-bottom: 1.25rem;
}
.callout > :last-child { margin-bottom: 0; }

.meta { color: var(--muted); }
.policy h2 { font-size: 1.3rem; }

@media (forced-colors: active) {
  .btn { border-color: ButtonText; }
  .card, .callout, .site-header, .site-footer { border-color: CanvasText; }
}

@media print {
  .site-header, .site-footer, .skip-link { display: none; }
  body { background: #fff; color: #000; }
}