/* Design tokens. Light palette on :root; dark palette below. */
:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --bg-raised: #f4f5f7;
  --text: #1b1b1b;
  --text-muted: #4a4a4a;
  --link: #0b5cad;
  --border: #6b6b6b;
  --focus: #0b5cad;
  --max-width: 64rem;
  --gutter: 1rem;
  --target: 44px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121417;
    --bg-raised: #1c1f24;
    --text: #e6e6e6;
    --text-muted: #c2c2c2;
    --link: #8ab4f8;
    --border: #9a9a9a;
    --focus: #8ab4f8;
  }
}

@media (prefers-contrast: more) {
  :root {
    --border: currentColor;
  }
  .product-card {
    border-width: 3px;
  }
}

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

html {
  font-size: 100%;
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 1rem;
  line-height: 1.5;
  padding-inline: var(--gutter);
}

/* Focus: 2px solid, 3:1 against both backgrounds, offset so it is never clipped. */
:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

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

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -100%;
  padding: 0.75rem 1rem;
  background: var(--bg);
  color: var(--link);
  border: 2px solid var(--border);
  z-index: 10;
}

.skip-link:focus {
  top: var(--gutter);
}

.site-header,
.site-main,
.site-footer {
  max-width: var(--max-width);
  margin-inline: auto;
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-block: 1rem;
  border-bottom: 1px solid var(--border);
}

.site-name {
  font-weight: 700;
  font-size: 1.25rem;
  text-decoration: none;
  color: var(--text);
  min-height: var(--target);
  display: inline-flex;
  align-items: center;
}

.nav-toggle {
  display: none;
  min-width: var(--target);
  min-height: var(--target);
  background: var(--bg-raised);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 0.25rem;
  font: inherit;
  cursor: pointer;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: var(--target);
  padding-inline: 0.75rem;
}

.site-nav a[aria-current="page"] {
  font-weight: 700;
  text-decoration-thickness: 0.15em;
}

/* When the script runs it adds .js to <html>; only then is the nav collapsible. */
@media (max-width: 40rem) {
  .js .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  .js .site-nav[hidden] {
    display: none;
  }
  .js .site-nav {
    flex-basis: 100%;
  }
  .js .site-nav ul {
    flex-direction: column;
    gap: 0.5rem;
  }
}

.site-main {
  padding-block: 2rem 3rem;
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1.2;
  margin-block: 0 0.5rem;
}

h2 {
  font-size: 1.5rem;
  line-height: 1.3;
  margin-block: 2rem 1rem;
}

h3 {
  font-size: 1.125rem;
  line-height: 1.4;
  margin-block: 0 0.5rem;
}

.tagline {
  color: var(--text-muted);
  font-size: 1.125rem;
  margin-block: 0 1.5rem;
}

.product-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr));
}

.product-card {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.product-card p {
  margin: 0;
}

.product-link {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  min-height: var(--target);
  padding-inline: 1rem;
  border: 2px solid var(--link);
  border-radius: 0.25rem;
  font-weight: 600;
  text-decoration: none;
}

.product-link:hover {
  text-decoration: underline;
}

.status {
  font-weight: 600;
  color: var(--text-muted);
}

.site-footer {
  padding-block: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.9375rem;
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}