:root {
  --bg: #ffffff;
  --surface: #f6f7f9;
  --border: #e3e6ea;
  --text: #1b1f24;
  --muted: #5c6672;
  --accent: #3b6ef5;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171c;
    --surface: #1c2027;
    --border: #2c323b;
    --text: #e8eaed;
    --muted: #9aa4b1;
    --accent: #6f95ff;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Noto Sans KR", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
}

header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.bar {
  max-width: 820px;
  margin: 0 auto;
  padding: 18px 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 24px;
}

.brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

nav {
  display: flex;
  gap: 18px;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 15px;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
}

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

nav a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

main {
  max-width: 820px;
  margin: 0 auto;
  padding: 36px 20px 72px;
}

h1 {
  font-size: 28px;
  margin: 0 0 8px;
  line-height: 1.35;
}

h2 {
  font-size: 19px;
  margin: 36px 0 10px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

h2:first-of-type {
  border-top: none;
  padding-top: 0;
  margin-top: 28px;
}

p, li {
  font-size: 15px;
}

.lead {
  color: var(--muted);
  margin: 0 0 28px;
}

dl {
  margin: 0 0 28px;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 6px 12px;
}

dt {
  color: var(--muted);
  font-size: 14px;
}

dd {
  margin: 0;
  font-size: 14px;
  word-break: break-all;
}

ol, ul {
  padding-left: 22px;
}

li {
  margin-bottom: 6px;
}

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

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

.card-list li {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 18px;
  margin-bottom: 12px;
  background: var(--surface);
}

.card-list strong {
  display: block;
  margin-bottom: 4px;
}

.card-list span {
  color: var(--muted);
  font-size: 14px;
}

footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
}

.foot {
  max-width: 820px;
  margin: 0 auto;
  padding: 24px 20px 40px;
}

@media (max-width: 560px) {
  dl {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  dt {
    margin-top: 10px;
  }

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