:root {
  --bg: #fdfdfc;
  --fg: #1a1a1a;
  --muted: #6b6b6b;
  --line: #e6e4e0;
  --accent: #2a5a8f;
  --card: #f7f6f4;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141414;
    --fg: #e8e6e3;
    --muted: #9a9791;
    --line: #2c2c2c;
    --accent: #7fb0e0;
    --card: #1c1c1c;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

header {
  max-width: 44rem;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 0;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--fg);
  text-decoration: none;
}

nav { display: flex; gap: 1.15rem; flex-wrap: wrap; }

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: .9rem;
}

nav a:hover { color: var(--fg); }

main {
  max-width: 44rem;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

section { margin-top: 3.5rem; }

h1 {
  font-size: 2rem;
  margin: 2.5rem 0 .5rem;
  letter-spacing: .02em;
  font-weight: 600;
}

h2 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 1.1rem;
  padding-bottom: .55rem;
  border-bottom: 1px solid var(--line);
  letter-spacing: .03em;
}

h3 { font-size: .98rem; margin: 0 0 .4rem; font-weight: 600; }

p { margin: 0 0 .9rem; }

.lead { font-size: 1.05rem; color: var(--fg); }

.muted { color: var(--muted); font-size: .9rem; }

a { color: var(--accent); }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  gap: .9rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: .5rem;
  padding: 1rem 1.1rem;
}

.card p { font-size: .9rem; color: var(--muted); margin: 0 0 .6rem; }

.tag {
  display: inline-block;
  font-size: .75rem;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: .05rem .55rem;
  margin: 0;
}

.list { list-style: none; padding: 0; margin: 0; }

.list li {
  padding: .55rem 0;
  border-bottom: 1px solid var(--line);
  font-size: .93rem;
}

.list li:last-child { border-bottom: none; }

.date {
  display: inline-block;
  min-width: 3.6rem;
  color: var(--muted);
  font-size: .8rem;
}

.skills { margin: 0; }

.skills dt {
  font-size: .8rem;
  color: var(--muted);
  letter-spacing: .06em;
  margin-top: .8rem;
}

.skills dt:first-child { margin-top: 0; }

.skills dd { margin: .15rem 0 0; font-size: .93rem; }

footer {
  max-width: 44rem;
  margin: 0 auto;
  padding: 1.6rem 1.25rem 3rem;
  border-top: 1px solid var(--line);
  text-align: center;
}

footer p { margin: .2rem 0; font-size: .85rem; }

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

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

@media (prefers-reduced-motion: no-preference) {
  a { transition: color .15s ease; }
}