app/src/styles/_base.css

/* ============================================================================ */
/* Base / Reset */
/* ============================================================================ */
html { box-sizing: border-box; }
*, *::before, *::after { box-sizing: inherit; }
body { margin: 0; font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica Neue, Arial, Apple Color Emoji, Segoe UI Emoji; color: var(--text-color); }
audio { display: block; width: 100%; }
/* Avoid constraining <main> inside grid; scope container sizing elsewhere if needed */
/* main { max-width: 980px; margin: 24px auto; padding: 16px; } */

/* ============================================================================ */
/* Typography (inspired by Distill) */
/* ============================================================================ */
html { font-size: 14px; line-height: 1.6; }
@media (min-width: 768px) { html { font-size: 16px; } }
@media (min-width: 1024px) { html { font-size: 17px; } }

.content-grid main { color: var(--text-color); }
.content-grid main p { margin: 0 0 var(--spacing-3); }

.content-grid main h2 {
  font-weight: 600;
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1.2;
  margin: var(--spacing-10) 0 var(--spacing-5);
  padding-bottom: var(--spacing-2);
  border-bottom: 1px solid var(--border-color);
}

.content-grid main h3 {
  font-weight: 700;
  font-size: clamp(18px, 2.1vw, 22px);
  line-height: 1.25;
  margin: var(--spacing-8) 0 var(--spacing-4);
}

.content-grid main h4 {
  font-weight: 600;
  text-transform: uppercase;
  font-size: 14px;
  line-height: 1.2;
  margin: var(--spacing-8) 0 var(--spacing-4);
}

.content-grid main a { color: var(--primary-color); text-decoration: none; border-bottom: 1px solid var(--link-underline); }
.content-grid main a:hover { color: var(--primary-color-hover); border-bottom: 1px solid var(--link-underline-hover); }

/* Do not underline heading links inside the article (not the TOC) */
.content-grid main h2 a,
.content-grid main h3 a,
.content-grid main h4 a { color: inherit; border-bottom: none; text-decoration: none; }
.content-grid main h2 a:hover,
.content-grid main h3 a:hover,
.content-grid main h4 a:hover { color: inherit; border-bottom: none; text-decoration: none; }

.content-grid main ul,
.content-grid main ol { padding-left: 24px; margin: 0 0 var(--spacing-3); }
.content-grid main li { margin-bottom: var(--spacing-2); }
.content-grid main li:last-child { margin-bottom: 0; }

.content-grid main blockquote {
  border-left: 2px solid var(--border-color);
  padding-left: var(--spacing-4);
  font-style: italic;
  color: var(--muted-color);
  margin: var(--spacing-4) 0;
}

/* Rely on Shiki's own token spans; no class remap */
/* Placeholder block (discreet centered text) */
.placeholder-block {
  display: grid;
  place-items: center;
  min-height: 120px;
  color: var(--muted-color);
  font-size: 12px;
  border: 1px dashed var(--border-color);
  border-radius: 8px;
  background: var(--surface-bg);
}

/* Demo blocks for width helpers */
.demo-wide,
.demo-full-bleed {
  display: grid;
  place-items: center;
  min-height: 150px;
  color: var(--muted-color);
  font-size: 12px;
  border: 1px dashed var(--border-color);
  border-radius: 8px;
  background: var(--surface-bg);
}


.content-grid main table { border-collapse: collapse; width: 100%; margin: 0 0 var(--spacing-4); }
.content-grid main th, .content-grid main td { border-bottom: 1px solid var(--border-color); padding: 6px 8px; text-align: left; font-size: 15px; }
.content-grid main thead th { border-bottom: 1px solid var(--border-color); }

.content-grid main hr { border: none; border-bottom: 1px solid var(--border-color); margin: var(--spacing-5) 0; }

/*
.code-block {
  background: rgba(120, 120, 120, 0.5);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: var(--spacing-3);
  font-size: 14px;
  overflow: auto;
}
*/

/* ============================================================================ */
/* Media / Figures */
/* ============================================================================ */
img,
picture {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Inline feature tags */
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0 16px; }
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  font-size: 12px;
  line-height: 1;
  border-radius: 999px;
  background: var(--surface-bg);
  border: 1px solid var(--border-color);
  color: var(--text-color);
}
[data-theme="dark"] .tag { background: #1a1f27; border-color: rgba(255,255,255,.15); }



/* ============================================================================ */
/* Figures, captions & image credits */
/* ============================================================================ */
figure { margin: 12px 0; }
figcaption { text-align: left; font-size: 0.9rem; color: var(--muted-color); margin-top: 6px; }
.image-credit { display: block; margin-top: 4px; font-size: 12px; color: var(--muted-color); }
.image-credit a { color: inherit; text-decoration: underline; text-underline-offset: 2px; }

/* ============================================================================ */
/* Buttons (minimal, clean) */
/* ============================================================================ */
button, .button {
  appearance: none;
  background: linear-gradient(15deg, var(--primary-color) 0%, var(--primary-color-hover) 35%);
  color: white!important;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
  display: inline-block;
  transition: background-color .15s ease, border-color .15s ease, box-shadow .15s ease, transform .02s ease;
}
/* Icon-only buttons: equal X/Y padding */
button:has(> svg:only-child),
.button:has(> svg:only-child) {
  padding: 8px !important;
}
button:hover, .button:hover {
  filter: brightness(96%);
}
button:active, .button:active {
  transform: translateY(1px);
}
button:focus-visible, .button:focus-visible {
  outline: none;
}
button:disabled, .button:disabled {
  opacity: .6;
  cursor: not-allowed;
}

/* Ghost/Muted button: subtle outline, primary color text/border */
.button--ghost {
  background: transparent !important;
  color: var(--primary-color) !important;
  border-color: var(--primary-color) !important;
}
.button--ghost:hover {
  color: var(--primary-color-hover) !important;
  border-color: var(--primary-color-hover) !important;
  filter: none;
}

.button-group .button {
  margin: 5px;
}

/* ============================================================================ */
/* Print styles */
/* ========================================================================= */
@media print {
  html, body { background: #fff; }
  /* Margins handled by Playwright; avoid extra global margins */
  body { margin: 0; }

  /* Keep the banner (hero), hide non-essential UI elements */
  #theme-toggle { display: none !important; }

  /* Links: remove underline */
  .content-grid main a { text-decoration: none; border-bottom: 1px solid rgba(0,0,0,.2); }

  /* Avoid breaks inside complex blocks */
  .content-grid main pre,
  .content-grid main blockquote,
  .content-grid main table,
  .content-grid main figure { break-inside: avoid; page-break-inside: avoid; }

  /* Soft page breaks around main headings */
  .content-grid main h2 { page-break-before: auto; page-break-after: avoid; break-after: avoid-page; }

  /* Small icon labels not needed when printing */
  .code-lang-chip { display: none !important; }

  /* Adjust more contrasty colors for print */
  :root {
    --border-color: rgba(0,0,0,.2);
    --link-underline: rgba(0,0,0,.3);
    --link-underline-hover: rgba(0,0,0,.4);
  }

  /* Force single column to reduce widows/orphans and awkward breaks */
  .content-grid { grid-template-columns: 1fr !important; }
  .toc, .right-aside, .toc-mobile { display: none !important; }
  main > nav:first-of-type { display: none !important; }

  /* Avoid page breaks inside complex visual blocks */
  .hero,
  .hero-banner,
  .d3-galaxy,
  .d3-galaxy svg,
  .html-embed__card,
  .html-embed__card,
  .js-plotly-plot,
  figure,
  pre,
  table,
  blockquote,
  .wide,
  .full-bleed {
    break-inside: avoid;
    page-break-inside: avoid;
  }
  /* Prefer keeping header+lead together */
  .hero { page-break-after: avoid; }
}

.muted {
  color: var(--muted-color);
}