:root {
  --bg: #ffffff;
  --fg: #1a1d21;
  --muted: #5c6470;
  --border: #e3e6ea;
  --card-bg: #f7f8fa;
  --accent: #2563eb;
  --code-bg: #f4f5f7;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171a;
    --fg: #e6e9ec;
    --muted: #9aa4b0;
    --border: #2b3138;
    --card-bg: #1c2127;
    --accent: #7aa2f7;
    --code-bg: #1c2127;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
.page { margin: 0 auto; padding: 1rem clamp(1.1rem, 4vw, 3rem) 4rem; }

.topnav {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: .6rem 0 1rem; font-size: .92rem;
}
.topnav a { color: var(--accent); text-decoration: none; }
.read-meta { color: var(--muted); }

h1 { font-size: 1.75rem; line-height: 1.25; margin: .5rem 0 1rem; }
h2 { font-size: 1.35rem; line-height: 1.3; margin: 2.2rem 0 .7rem; padding-top: .5rem; border-top: 1px solid var(--border); }
h3 { font-size: 1.1rem; margin: 1.6rem 0 .5rem; }
a { color: var(--accent); }
hr { border: 0; border-top: 2px solid var(--border); margin: 2.5rem 0; }
blockquote { margin: 1rem 0; padding: .1rem 1rem; border-left: 3px solid var(--border); color: var(--muted); }
img { max-width: 100%; }

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: .8rem 1rem;
  overflow-x: auto;
  font-size: .82rem;
  line-height: 1.5;
}
code { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: .85em; }
:not(pre) > code {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: .08em .35em;
}
pre code { border: 0; padding: 0; background: transparent; }
pre.mermaid {
  background: transparent;
  border: 1px solid var(--border);
  text-align: center;
  padding: .5rem;
}
pre.mermaid { cursor: zoom-in; }
pre.mermaid svg { display: block; margin: 0 auto; }
pre.mermaid.expanded {
  position: fixed; inset: 0; z-index: 50; margin: 0;
  border: 0; border-radius: 0;
  background: var(--bg);
  overflow: auto;
  cursor: zoom-out;
  padding: 2rem;
}

table {
  border-collapse: collapse;
  font-size: .9rem;
  display: block;
  overflow-x: auto;
  max-width: 100%;
}
th, td { border: 1px solid var(--border); padding: .4rem .7rem; text-align: left; }
th { background: var(--card-bg); }

.toc {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: .6rem .9rem;
  margin-bottom: 1rem;
  font-size: .92rem;
}
.toc summary { cursor: pointer; color: var(--muted); font-weight: 600; }
.toc ul { margin: .5rem 0 .2rem; padding-left: 1.2rem; }
.toc li { margin: .25rem 0; }
.toc a { text-decoration: none; }

.site-header .subtitle { color: var(--muted); font-size: 1.02rem; }
.section-title { margin-top: 2.2rem; }
.cards { display: grid; gap: .9rem; margin-top: 1.5rem; grid-template-columns: repeat(auto-fill, minmax(24rem, 1fr)); }
@media (max-width: 26rem) { .cards { grid-template-columns: 1fr; } }
.card {
  display: block;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  text-decoration: none;
  color: var(--fg);
}
.card:active { opacity: .8; }
.card h2 { font-size: 1.12rem; margin: 0 0 .4rem; border: 0; padding: 0; }
.card p { margin: 0 0 .6rem; font-size: .92rem; color: var(--muted); line-height: 1.5; }
.card-meta { display: flex; gap: .5rem; align-items: center; font-size: .78rem; color: var(--muted); flex-wrap: wrap; }
.badge {
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: .05rem .55rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  font-size: .68rem;
}
.badge-design { color: var(--accent); border-color: var(--accent); }
.badge-interview { color: #b45309; border-color: #b45309; }
.badge-sources { color: #15803d; border-color: #15803d; }
@media (prefers-color-scheme: dark) {
  .badge-interview { color: #fbbf24; border-color: #92600a; }
  .badge-sources { color: #4ade80; border-color: #1d6b35; }
}