:root {
  --color-dark: #1f2937;
  --color-light: #ffffff;
  --color-soft: #f3f4f6;
  --color-accent: #8ab4f8;
  --text-base: 1rem;
  --font-base: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --max-width: 70rem;
  --radius: 0.75rem;
  --shadow: 0 8px 20px rgba(15, 23, 42, 0.15);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-base);
  font-size: var(--text-base);
  line-height: 1.6;
  background: var(--color-soft);
  color: var(--color-dark);
}

a {
  color: inherit;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

img {
  max-width: 100%;
  display: block;
  border-radius: var(--radius);
}

.container {
  width: min(100% - 2.5rem, var(--max-width));
  margin: 0 auto;
}

.site-header {
  background: var(--color-dark);
  color: var(--color-light);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
}

.branding .site-label {
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  gap: 1rem;
}

.nav-list a {
  text-decoration: none;
  color: var(--color-light);
  font-weight: 500;
}

.nav-list a:hover {
  text-decoration: underline;
}

.hero {
  padding: 3rem 0;
  background: var(--color-light);
}

.hero-grid {
  display: grid;
  gap: 2rem;
}

.eyebrow {
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #4b5563;
}

h1 {
  font-size: clamp(2rem, 5vw, 2.8rem);
  margin-top: 0.3rem;
  margin-bottom: 0.75rem;
}

.intro {
  max-width: 32rem;
  margin-bottom: 1.5rem;
}

.btn {
  display: inline-block;
  background: var(--color-dark);
  color: var(--color-light);
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  transition: opacity 0.2s ease-in-out;
}

.btn.secondary {
  background: transparent;
  color: var(--color-dark);
  border: 2px solid var(--color-dark);
}

.btn:hover {
  opacity: 0.8;
}

.hero-figure figcaption {
  font-size: 0.9rem;
  color: #4b5563;
  margin-top: 0.5rem;
}

.parts,
.downloads,
.tips {
  padding: 3rem 0;
}

.section-lead {
  color: #4b5563;
  max-width: 40rem;
  margin-bottom: 1.5rem;
}

.table-wrapper {
  overflow-x: auto;
  background: var(--color-light);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 32rem;
}

th,
td {
  text-align: left;
  padding: 1rem;
  border-bottom: 1px solid var(--color-soft);
}

th {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: #e5e7eb;
}

.code {
  font-family: var(--font-mono);
  background: #e5e7eb;
  padding: 0.15rem 0.35rem;
  border-radius: 0.25rem;
}

.download-grid,
.tips-grid {
  display: grid;
  gap: 1.5rem;
}

.catalogue-card,
.tip-card {
  background: var(--color-light);
  padding: 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.catalogue-card h3,
.tip-card h3 {
  margin-top: 0;
}

.site-footer {
  background: var(--color-dark);
  color: var(--color-light);
  padding: 2rem 0;
}

.footer-grid {
  display: grid;
  gap: 1.5rem;
}

.footer-grid a {
  color: var(--color-light);
}

.footer-brand {
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.disclaimer {
  font-size: 0.9rem;
  color: #d1d5db;
}

@media (min-width: 48rem) {
  .hero-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: center;
  }

  .download-grid,
  .tips-grid,
  .footer-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .header-inner {
    padding: 1.25rem 0;
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}