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

:root {
  --git-orange: #f14e32;
  --bg: #ffffff;
  --card-bg: #f8f9fa;
  --card-border: #dee2e6;
  --text: #212529;
  --text-muted: #6c757d;
  --code-bg: #2b2b2b;
  --code-text: #f8f8f2;
  --heading-font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --mono-font: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
}

html {
  font-size: 14px;
}

body {
  font-family: var(--heading-font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
  padding: 1.5rem;
}

/* ===== Header ===== */
header {
  text-align: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 3px solid var(--git-orange);
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--git-orange);
  letter-spacing: -0.02em;
}

header .subtitle {
  color: var(--text-muted);
  font-size: 1rem;
  margin-top: 0.25rem;
}

/* ===== Nav bar ===== */
.group-nav {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 0.75rem;
}

.group-nav a {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

.group-nav a:hover {
  color: var(--git-orange);
  border-bottom-color: var(--git-orange);
}

/* ===== Page groups ===== */
.page-group {
  max-width: 1400px;
  margin: 0 auto 1.5rem;
  scroll-margin-top: 0.5rem;
}

.page-group-heading {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--card-border);
  padding-bottom: 0.3rem;
  margin-bottom: 0.75rem;
}

/* ===== Card Grid ===== */
.group-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 6px;
  padding: 1rem;
}

.card-title {
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--git-orange);
  border-bottom: 2px solid var(--git-orange);
  padding-bottom: 0.4rem;
  margin-bottom: 0.75rem;
}

/* ===== Content inside cards ===== */
.card h3 {
  font-size: 1rem;
}

.card h4 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-top: 0.6rem;
  margin-bottom: 0.2rem;
}

.card p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}

/* ===== Inline code ===== */
.card code,
.card .language-plaintext.highlighter-rouge code {
  font-family: var(--mono-font);
  font-size: 0.8rem;
  background: var(--code-bg);
  color: var(--code-text);
  padding: 0.15em 0.4em;
  border-radius: 3px;
}

/* ===== Code blocks ===== */
.card .highlighter-rouge {
  margin: 0.3rem 0 0.5rem;
}

.card .highlighter-rouge .highlight {
  background: var(--code-bg);
  border-radius: 4px;
  overflow-x: auto;
}

.card pre,
.card .highlighter-rouge pre.highlight {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 0.5rem 0.75rem;
  border-radius: 4px;
  margin: 0;
  overflow-x: auto;
  font-family: var(--mono-font);
  font-size: 0.8rem;
  line-height: 1.4;
}

.card pre code,
.card .highlighter-rouge pre.highlight code {
  background: none;
  padding: 0;
  font-size: inherit;
  color: inherit;
  border-radius: 0;
}

/* ===== Lists ===== */
.card ul {
  list-style: none;
  padding: 0;
}

.card ol {
  padding-left: 1.2rem;
  margin: 0.3rem 0;
}

.card li {
  font-size: 0.8rem;
  padding: 0.15rem 0;
  color: var(--text);
}

.card li code {
  font-size: 0.75rem;
}

/* ===== Mermaid diagrams ===== */
.card .mermaid {
  margin: 0.5rem 0;
  text-align: center;
}

.card .mermaid svg {
  max-width: 100%;
  height: auto;
}

/* ===== Footer ===== */
footer {
  text-align: center;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--card-border);
  color: var(--text-muted);
  font-size: 0.85rem;
}

footer a {
  color: var(--git-orange);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* ===== Responsive ===== */
@media (max-width: 1200px) {
  .group-cards {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 900px) {
  .group-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .group-cards {
    grid-template-columns: 1fr;
  }
}

/* ===== Print Styles ===== */
@media print {
  @page {
    size: landscape;
    margin: 0.4in;
  }

  html {
    font-size: 8pt;
  }

  body {
    padding: 0;
  }

  header {
    margin-bottom: 0.3rem;
    padding-bottom: 0.2rem;
  }

  header h1 {
    font-size: 14pt;
  }

  header .subtitle {
    font-size: 8pt;
  }

  .group-nav {
    display: none;
  }

  .page-group {
    margin-bottom: 0.2rem;
  }

  .page-group-heading {
    font-size: 0.55rem;
    margin-bottom: 0.15rem;
    margin-top: 0;
    break-after: avoid;
    page-break-after: avoid;
  }

  .group-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.3rem;
    break-inside: avoid;
  }

  .card {
    border: 1px solid #999;
    padding: 0.3rem;
  }

  .card-title {
    font-size: 0.8rem;
    padding-bottom: 0.15rem;
    margin-bottom: 0.3rem;
  }

  .card h4 {
    font-size: 0.65rem;
    margin-top: 0.25rem;
    margin-bottom: 0.1rem;
  }

  .card p,
  .card li {
    font-size: 0.6rem;
    line-height: 1.25;
  }

  .card pre,
  .card .highlighter-rouge pre.highlight {
    background: #eee !important;
    color: #000 !important;
    border: 1px solid #ccc;
    padding: 0.2rem 0.35rem;
    font-size: 0.6rem;
    line-height: 1.25;
  }

  .card code {
    background: #eee !important;
    color: #000 !important;
    font-size: 0.6rem;
  }

  .card .highlighter-rouge {
    margin: 0.1rem 0 0.2rem;
  }

  .card .mermaid svg {
    max-height: 80px;
  }

  footer {
    display: none;
  }
}