/* ── Reset ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-surface: #1a1a1a;
  --text-primary: #d4d4d4;
  --text-secondary: #888888;
  --accent: #00ff41;
  --accent-dim: #00cc33;
  --accent-glow: rgba(0, 255, 65, 0.15);
  --border: #222222;
  --font: "JetBrains Mono", "SF Mono", "Fira Code", "Cascadia Code", "Consolas", monospace;
  --max-width: 580px;
}

html { font-size: 16px; }

body {
  font-family: var(--font);
  color: var(--text-primary);
  background: var(--bg-primary);
  line-height: 1.7;
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(0, 0, 0, 0.03) 2px,
      rgba(0, 0, 0, 0.03) 4px
    );
  background-attachment: fixed;
}

::selection {
  background: var(--accent);
  color: var(--bg-primary);
}

a { color: var(--accent); }

/* ── Nav ── */
nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1.5rem 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.wordmark {
  font-weight: 600;
  text-decoration: none;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-size: 0.8rem;
  text-shadow: 0 0 20px rgba(0, 255, 65, 0.3);
}

.nav-links {
  display: flex;
  gap: 1.25rem;
}

.nav-link {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-decoration: none;
  letter-spacing: 0.05em;
}
.nav-link:hover,
.nav-link:focus-visible { color: var(--accent); }

/* ── Main ── */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── Hero ── */
.hero { padding: 3rem 0 2rem; }

.hero h1 {
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent);
  text-shadow: 0 0 20px rgba(0, 255, 65, 0.3);
}

.hero .subtitle {
  color: var(--text-secondary);
  margin-bottom: 0.8rem;
  font-style: italic;
}

.cta {
  margin-top: 1.25rem;
}

.cta a {
  display: inline-block;
  padding: 0.6rem 1.2rem;
  font-family: var(--font);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--bg-primary);
  background: var(--accent);
  border: 1px solid var(--accent);
  cursor: pointer;
}

.cta a:hover,
.cta a:focus-visible {
  background: transparent;
  color: var(--accent);
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ── Sections ── */
section { padding: 1.5rem 0; }
section + section { border-top: 1px solid var(--border); }

h2 {
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.75rem;
  font-size: 0.75rem;
}

h3 {
  font-weight: 600;
  margin-bottom: 0.3rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-primary);
}

section h3 {
  margin-top: 1rem;
  font-size: 0.85rem;
}

p { margin-bottom: 0.6rem; }
p:last-child { margin-bottom: 0; }

em { color: var(--text-secondary); }
strong { color: #fff; font-weight: 700; }

/* ── Steps ── */
.steps {
  list-style: none;
  counter-reset: step;
}

.steps li {
  counter-increment: step;
  position: relative;
  padding-left: 2rem;
  margin-bottom: 0.8rem;
}

.steps li::before {
  content: counter(step) ".";
  position: absolute;
  left: 0;
  font-weight: 600;
  color: var(--accent);
}

.steps li strong {
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: #fff;
}

.steps li span { display: block; margin-top: 0.15rem; }

/* ── Tab Cards ── */
.tabs-preview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

@media (max-width: 500px) {
  .tabs-preview { grid-template-columns: 1fr; }
}

.tab-card {
  border: 1px solid var(--border);
  padding: 1rem;
  background: var(--bg-secondary);
}

.tab-card.accent-card {
  border-color: var(--accent-dim);
  background: rgba(0, 255, 65, 0.04);
}

.tab-icon {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.5rem;
  font-family: var(--font);
}

.accent-card .tab-icon {
  text-shadow: 0 0 10px rgba(0, 255, 65, 0.4);
}

.tab-card h3 {
  font-size: 0.85rem;
  margin-bottom: 0.35rem;
}

.tab-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ── Two Column ── */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 0.8rem;
}

@media (max-width: 500px) {
  .two-col { grid-template-columns: 1fr; gap: 0.8rem; }
}

.aside {
  font-style: italic;
  color: var(--text-secondary);
}

/* ── Definition List ── */
dl { display: grid; gap: 0.6rem; }

dt {
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #fff;
  margin-bottom: -0.1rem;
}

dd { color: var(--text-primary); }

/* ── Lists ── */
ul { list-style: none; }

#for-whom ul li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.35rem;
}

#for-whom ul li::before {
  content: ">";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 600;
}

.repo-list li {
  padding-left: 1.5rem;
  position: relative;
  margin-bottom: 0.25rem;
}

.repo-list li::before {
  content: "*";
  position: absolute;
  left: 0.25rem;
  color: var(--accent);
}

code {
  font-family: var(--font);
  font-size: 1em;
  color: var(--accent);
  background: rgba(0, 255, 65, 0.08);
  border: 1px solid rgba(0, 255, 65, 0.15);
  padding: 0.1em 0.3em;
  border-radius: 2px;
}

/* ── Footer ── */
footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1.5rem 3rem;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-style: italic;
}

footer p { margin-bottom: 0.5rem; }
footer .links { font-style: normal; }

footer .links a {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-decoration: none;
}
footer .links a:hover,
footer .links a:focus-visible { color: var(--accent); }

/* ── Focus ── */
*:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ── Skip Nav ── */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: var(--bg-primary);
  font-weight: 600;
  text-decoration: none;
}
.skip-link:focus { left: 0; }

/* ── Responsive ── */
@media (max-width: 580px) {
  nav {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  .nav-links {
    gap: 0.75rem;
    flex-wrap: wrap;
  }
}

@media (max-width: 480px) {
  .hero { padding: 2.5rem 0 1.5rem; }
  .hero h1 { font-size: 1.15rem; }
  section { padding: 1.25rem 0; }
  .nav-links {
    width: 100%;
    justify-content: flex-start;
  }
  .nav-link { font-size: 0.75rem; }
}

/* ── Print ── */
@media print {
  header, footer, nav, .cta { display: none; }
  body { background: white; color: black; }
  a { color: black; text-decoration: underline; }
  :root {
    --text-primary: #000;
    --text-secondary: #333;
    --accent: #000;
    --bg-primary: #fff;
    --bg-secondary: #f5f5f5;
    --border: #ccc;
  }
}