:root {
  --ink: #182126;
  --text: #2e3a41;
  --muted: #68757c;
  --faint: #a3abaf;
  --canvas: #fafaf7;
  --surface: #ffffff;
  --panel: #f2f3ef;
  --line: #dcdfdb;
  --accent: #4053cc;
  --accent-soft: #e9ecfb;
  --accent-ink: #34449b;
  --code-bg: #23272f;
  --code-ink: #e5e8ec;
  --problem: #b4363b;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  color-scheme: light;
}

/* The dark theme follows the system setting: the same page, other colours. */
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #eef1f3;
    --text: #cdd4d9;
    --muted: #97a2a9;
    --faint: #66717a;
    --canvas: #15181c;
    --surface: #1d2126;
    --panel: #23282e;
    --line: #333a42;
    --accent: #93a1ff;
    --accent-soft: #272e55;
    --accent-ink: #c3cbff;
    --code-bg: #0f1216;
    --code-ink: #e5e8ec;
    --problem: #ff8a8a;
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font: 15px/1.5 var(--sans);
  -webkit-font-smoothing: antialiased;
}

.atlas {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  height: 100vh;
}

/* ---------- Header ---------- */
.top {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 12px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.brand {
  margin: 0;
  font-size: 19px;
  font-weight: 650;
  letter-spacing: -0.3px;
}
.search {
  position: relative;
  flex: 0 1 420px;
}
.search input {
  width: 100%;
  padding: 7px 36px 7px 12px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--canvas);
  color: var(--ink);
  font: inherit;
  font-size: 14px;
}
.search input::placeholder {
  color: var(--faint);
}
.search input:focus {
  border-color: var(--accent);
  outline: 3px solid var(--accent-soft);
  background: var(--surface);
}
.search kbd {
  position: absolute;
  top: 50%;
  right: 10px;
  transform: translateY(-50%);
  padding: 0 6px;
  border: 1px solid var(--line);
  border-radius: 5px;
  color: var(--muted);
  font: 12px/1.5 var(--mono);
  pointer-events: none;
}
.search input:focus + kbd {
  display: none;
}
.summary {
  margin: 0;
  padding: 1px 10px;
  border-radius: 999px;
  background: var(--panel);
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
}
.summary:empty {
  display: none;
}

/* ---------- Skill list ---------- */
.layout {
  display: grid;
  grid-template-columns: minmax(280px, 380px) minmax(0, 1fr);
  min-height: 0;
}
.side {
  display: flex;
  flex-direction: column;
  min-height: 0;
  border-right: 1px solid var(--line);
}
.list {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 0 10px 10px;
}
.group-name {
  position: sticky;
  top: 0;
  z-index: 1;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin: 0 -10px;
  padding: 12px 22px 6px;
  background: var(--canvas);
  color: var(--muted);
  font: 600 12px/1.4 var(--mono);
}
.group-count {
  color: var(--faint);
  font-weight: 500;
}
.empty {
  margin: 24px 12px;
  color: var(--muted);
}
.list ul {
  display: grid;
  grid-template-columns: minmax(0, 1fr); /* lets long descriptions truncate */
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.skill {
  display: flex;
  flex-direction: column;
  gap: 1px;
  width: 100%;
  padding: 8px 12px;
  border: 0;
  border-radius: 10px;
  background: none;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}
.skill:hover {
  background: var(--panel);
}
.skill[aria-current='true'] {
  background: var(--accent-soft);
  box-shadow: inset 3px 0 0 var(--accent);
}
.skill:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}
.skill-name {
  overflow: hidden;
  font: 600 14px/1.4 var(--mono);
  white-space: nowrap;
  text-overflow: ellipsis;
}
.skill-description {
  overflow: hidden;
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
  text-overflow: ellipsis;
}

/* ---------- SKILL.md viewer ---------- */
.viewer {
  overflow-y: auto;
  padding: 18px 32px 48px;
}
.viewer > * {
  max-width: 820px;
}
.placeholder,
.problem {
  margin: 40px 0;
  color: var(--muted);
}
.problem {
  color: var(--problem);
}
.file {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 14px;
  font: 13px var(--mono);
  color: var(--muted);
}
.file-name {
  color: var(--ink);
  font-weight: 600;
}
.file-path {
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}
.copy {
  flex: none;
  margin-left: auto;
  padding: 1px 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text);
  font: 500 13px var(--sans);
  cursor: pointer;
}
.copy:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.open {
  flex: none;
  color: var(--accent);
  font: 500 14px var(--sans);
  text-decoration: none;
}
.open:hover {
  text-decoration: underline;
}

.properties {
  margin-bottom: 14px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}
.properties dl {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  gap: 6px 18px;
  margin: 0;
  font-size: 14px;
}
.properties dt {
  color: var(--muted);
  font: 13px/1.55 var(--mono);
}
.properties dd {
  margin: 0;
  overflow-wrap: anywhere;
  white-space: pre-line;
}
.properties dd.path {
  font: 13px/1.55 var(--mono);
}
.flags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}
.flags li {
  padding: 1px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-ink);
  font: 12px/1.7 var(--mono);
}

/* The skills most like this one, below the front matter. */
.similar {
  display: flex;
  align-items: baseline;
  gap: 8px 14px;
  margin: 0 0 26px;
  padding: 0 18px;
}
.similar-label {
  flex: none;
  color: var(--muted);
  font: 13px/1.55 var(--mono);
}
.similar ul {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.similar-skill {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 2px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink);
  font: 12.5px/1.6 var(--mono);
  cursor: pointer;
}
.similar-skill:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent-ink);
}
.similar-skill:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}
.similar-repository {
  color: var(--muted);
  font: 12px var(--sans);
}
.similar-skill .score {
  color: var(--muted);
  font-size: 11.5px;
  font-variant-numeric: tabular-nums;
}
.similar-none {
  color: var(--faint);
  font-size: 13px;
}

/* ---------- Markdown ---------- */
.markdown {
  color: var(--text);
  font-size: 15px;
  line-height: 1.65;
  overflow-wrap: break-word;
}
.markdown > :first-child {
  margin-top: 0;
}
.markdown h1,
.markdown h2,
.markdown h3,
.markdown h4,
.markdown h5,
.markdown h6 {
  margin: 1.6em 0 0.5em;
  color: var(--ink);
  line-height: 1.3;
  letter-spacing: -0.2px;
}
.markdown h1 {
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
  font-size: 24px;
}
.markdown h2 {
  font-size: 19px;
}
.markdown h3 {
  font-size: 16px;
}
.markdown h4,
.markdown h5,
.markdown h6 {
  font-size: 15px;
}
.markdown p,
.markdown ul,
.markdown ol,
.markdown pre,
.markdown blockquote {
  margin: 0 0 14px;
}
.markdown ul,
.markdown ol {
  padding-left: 24px;
}
.markdown li + li,
.markdown li > ul,
.markdown li > ol {
  margin-top: 4px;
}
.markdown li > ul,
.markdown li > ol,
.markdown li > pre {
  margin-bottom: 0;
}
.markdown code {
  padding: 1px 5px;
  border-radius: 5px;
  background: var(--panel);
  font: 0.87em var(--mono);
}
.markdown pre {
  overflow-x: auto;
  padding: 14px 16px;
  border-radius: 10px;
  background: var(--code-bg);
  color: var(--code-ink);
  font: 13px/1.6 var(--mono);
}
.markdown pre code {
  padding: 0;
  background: none;
  font: inherit;
}
.markdown pre.table {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
}
.markdown blockquote {
  padding: 2px 16px;
  border-left: 3px solid var(--line);
  color: var(--muted);
}
.markdown hr {
  margin: 24px 0;
  border: 0;
  border-top: 1px solid var(--line);
}
.markdown a {
  color: var(--accent);
}

@media (max-width: 760px) {
  .atlas {
    height: auto;
  }
  .top {
    flex-wrap: wrap;
    gap: 10px 16px;
  }
  .search {
    order: 1;
    flex-basis: 100%;
  }
  .layout {
    grid-template-columns: 1fr;
  }
  .side {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .list {
    max-height: 45vh;
  }
  .viewer {
    padding: 18px 18px 40px;
  }
}