/* grep — day/night terminal-flavoured theme */
:root {
  --bg: #0d1117;
  --bg-2: #11151c;
  --card: #11151c;
  --text: #e6edf3;
  --muted: #8b949e;
  --faint: #6e7681;
  --border: #21262d;
  --accent: #7ee787;
  --accent-2: #ff8000;
  --link: #58a6ff;
  --header-border: #21262d;
  --caret: #7ee787;
  --code: #ffa657;
}
[data-theme="light"] {
  --bg: #f6f8fa;
  --bg-2: #ffffff;
  --card: #ffffff;
  --text: #1f2328;
  --muted: #57606a;
  --faint: #8c959f;
  --border: #d0d7de;
  --accent: #1a7f37;
  --accent-2: #b35900;
  --link: #0969da;
  --header-border: #d8dee4;
  --caret: #1a7f37;
  --code: #953800;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  transition: background .25s ease, color .25s ease;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- header ---------- */
.site-header {
  max-width: 880px;
  margin: 0 auto;
  padding: 28px 20px 12px;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid var(--header-border);
}
.wordmark {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 26px;
  color: var(--text);
  letter-spacing: -.5px;
}
.wordmark .prompt { color: var(--accent); }
.wordmark strong { color: var(--accent-2); }
.wordmark:hover { text-decoration: none; }
.caret {
  display: inline-block;
  width: 10px; height: 20px;
  margin-left: 2px;
  background: var(--caret);
  vertical-align: -3px;
  animation: blink 1.1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }
.tagline { margin: 4px 0 0; color: var(--muted); font-size: 14px; font-family: ui-monospace, monospace; }
.topnav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 14px;
}
.navlink {
  color: var(--muted);
  padding: 4px 10px;
  border-radius: 6px;
  border: 1px solid transparent;
}
.navlink:hover { color: var(--text); background: var(--bg-2); text-decoration: none; }
.navlink.ghost { background: none; font-size: 16px; cursor: pointer; }
.navlink.disabled { color: var(--faint); cursor: default; }
.edition-pill {
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 12px;
  font-family: ui-monospace, monospace;
  font-size: 12.5px;
  white-space: nowrap;
}

/* ---------- podcast player ---------- */
.podcast-player {
  margin: 18px 0 2px;
  padding: 16px 18px 18px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.podcast-title {
  margin: 0;
  font-family: ui-monospace, monospace;
  font-size: 18px;
}
.podcast-audio {
  display: block;
  width: 100% !important;
  min-width: 100%;
  max-width: 100%;
  margin-top: 12px;
  accent-color: var(--accent);
}

/* ---------- top-level sections ---------- */
.section-nav {
  display: flex;
  gap: 5px;
  overflow-x: auto;
  padding: 5px;
  margin: 18px 0 0;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.section-tab {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 6px 13px;
  white-space: nowrap;
  font-family: ui-monospace, monospace;
  font-size: 13px;
}
.section-tab:hover {
  color: var(--text);
  background: var(--card);
  border-color: var(--faint);
  text-decoration: none;
}
.section-tab.active {
  color: var(--section-color);
  background: var(--card);
  border-color: var(--section-color);
  box-shadow: 0 0 0 1px var(--section-color) inset;
}
.section-tab-count {
  color: inherit;
  opacity: .75;
  border: 1px solid currentColor;
  border-radius: 999px;
  padding: 0 6px;
  font-size: 11px;
}
.section-panel[hidden] { display: none; }
.section-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 0 8px;
}
.section-heading h1 {
  margin: 0;
  font-family: ui-monospace, monospace;
  font-size: 25px;
  line-height: 1.2;
}
.section-summary {
  max-width: 680px;
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14.5px;
}
.section-count {
  flex: 0 0 auto;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 10px;
  font-family: ui-monospace, monospace;
  font-size: 12px;
  white-space: nowrap;
}
.empty-state {
  margin: 24px 0;
  color: var(--faint);
  font-family: ui-monospace, monospace;
}

/* ---------- filters ---------- */
main { max-width: 880px; margin: 0 auto; padding: 0 20px 60px; }
.filters {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 18px 0 10px;
  border-bottom: 1px solid var(--header-border);
  margin-bottom: 8px;
}
.filter-label {
  color: var(--faint);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-right: 4px;
}
.chip {
  font-family: inherit;
  font-size: 13px;
  color: var(--muted);
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 12px;
  cursor: pointer;
  transition: all .15s ease;
}
.chip:hover { color: var(--text); border-color: var(--faint); }
.chip.active {
  color: var(--text);
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent) inset;
}
.chip.active[data-filter-source="hn"]         { border-color: #ff8000; box-shadow: 0 0 0 1px #ff8000 inset; color: #ff8000; }
.chip.active[data-filter-source="arxiv"]      { border-color: #ff5a5f; box-shadow: 0 0 0 1px #ff5a5f inset; color: #ff5a5f; }
.chip.active[data-filter-source="github"]     { border-color: #8b5cf6; box-shadow: 0 0 0 1px #8b5cf6 inset; color: #a78bfa; }
.chip.active[data-filter-source="other"]      { border-color: #22d3ee; box-shadow: 0 0 0 1px #22d3ee inset; color: #22d3ee; }
.chip.active[data-filter-source="reddit"]     { border-color: #ff4500; box-shadow: 0 0 0 1px #ff4500 inset; color: #ff4500; }
.chip.active[data-filter-source="hackaday"]   { border-color: #f97316; box-shadow: 0 0 0 1px #f97316 inset; color: #f97316; }
.chip.active[data-filter-source="adafruit"]   { border-color: #7c3aed; box-shadow: 0 0 0 1px #7c3aed inset; color: #a78bfa; }
.chip.active[data-filter-source="arduino"]    { border-color: #00979d; box-shadow: 0 0 0 1px #00979d inset; color: #32c5c7; }
.chip.active[data-filter-source="espressif"]  { border-color: #e7352c; box-shadow: 0 0 0 1px #e7352c inset; color: #ff817c; }
.chip.active[data-filter-source="3dprinting"] { border-color: #14b8a6; box-shadow: 0 0 0 1px #14b8a6 inset; color: #2dd4bf; }
.chip.active[data-filter-source="nasa"]       { border-color: #fc3d21; box-shadow: 0 0 0 1px #fc3d21 inset; color: #ff7b6b; }
.chip.active[data-filter-source="esa"]        { border-color: #4f8ef7; box-shadow: 0 0 0 1px #4f8ef7 inset; color: #8bb8ff; }
.chip.active[data-filter-source="science"]    { border-color: #10b981; box-shadow: 0 0 0 1px #10b981 inset; color: #34d399; }
.chip-sep { width: 1px; height: 18px; background: var(--border); margin: 0 6px; }

/* ---------- stories ---------- */
.stories { margin-top: 6px; }
.story {
  display: grid;
  grid-template-columns: 176px 1fr;
  gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--header-border);
}
.story[hidden] { display: none; }
.thumb {
  display: block;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-2);
  aspect-ratio: 4 / 3;
}
.thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: top;
  display: block;
}
.story-body { min-width: 0; }
.story-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12.5px;
  color: var(--muted);
  margin-bottom: 6px;
  font-family: ui-monospace, monospace;
}
.src-tag {
  --c: #ff8000;
  color: var(--c);
  border: 1px solid var(--c);
  border-radius: 5px;
  padding: 0 6px;
  font-weight: 700;
  font-size: 11px;
}
.by { color: var(--faint); }
.orig, .discuss { color: var(--muted); }
.orig:hover, .discuss:hover { color: var(--link); text-decoration: none; }
.tier-chip {
  margin-left: auto;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .05em;
  padding: 1px 8px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
}
.tier-chip.tier-must { color: var(--accent-2); border-color: var(--accent-2); }
.story-title {
  margin: 0 0 6px;
  font-size: 18.5px;
  line-height: 1.35;
}
.story-title a { color: var(--text); }
.story-title a:hover { color: var(--link); text-decoration: none; }
.story-summary p { margin: 6px 0; color: var(--muted); font-size: 14.5px; }

/* ---------- archive ---------- */
.page-title {
  font-family: ui-monospace, monospace;
  font-size: 22px;
  margin: 34px 0 16px;
}
.page-title::before { content: "# "; color: var(--accent-2); }
.arch-list { list-style: none; padding: 0; margin: 0; }
.arch-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 12px 2px;
  border-bottom: 1px solid var(--header-border);
  font-family: ui-monospace, monospace;
  font-size: 15px;
}
.arch-row a { color: var(--text); }
.arch-row a:hover { color: var(--link); }
.arch-meta { color: var(--faint); font-size: 12.5px; }

/* ---------- footer ---------- */
.site-footer {
  max-width: 880px;
  margin: 0 auto;
  padding: 20px;
  color: var(--faint);
  font-size: 13px;
  border-top: 1px solid var(--header-border);
}
.site-footer p { margin: 0; }

@media (max-width: 600px) {
  .section-nav { margin-left: 0; margin-right: 0; }
  .section-tab { padding-left: 10px; padding-right: 10px; }
  .section-heading { flex-direction: column; gap: 8px; }
  .story { grid-template-columns: 1fr; }
  .thumb { max-width: 100%; aspect-ratio: 4/3; }
  .site-header { flex-direction: column; align-items: flex-start; }
}