:root {
  --bg: #f6f7f9; --card: #ffffff; --text: #1d2433; --muted: #6b7385;
  --line: #e3e6ec; --accent: #2457d6; --accent-soft: #e9efff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151b; --card: #1b1f27; --text: #e8ebf2; --muted: #9aa3b5;
    --line: #2c3240; --accent: #7aa2ff; --accent-soft: #1f2a44;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text); line-height: 1.75;
  font-family: Pretendard, "Apple SD Gothic Neo", "Malgun Gothic", system-ui, sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 20px 16px 48px; }
nav { font-size: .9rem; margin-bottom: 16px; color: var(--muted); }
a { color: var(--accent); }
h1 { font-size: 1.6rem; line-height: 1.35; margin: 8px 0; }
h2 { font-size: 1.2rem; margin-top: 32px; padding-top: 8px; border-top: 1px solid var(--line); }
h3 { font-size: 1.02rem; margin-top: 20px; }
.meta { color: var(--muted); font-size: .85rem; }
.lead { color: var(--muted); }
article, .posts li {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px;
}
.posts { list-style: none; padding: 0; display: grid; gap: 12px; }
.posts p { margin: 4px 0; color: var(--muted); font-size: .92rem; }
.posts a { text-decoration: none; }
table { width: 100%; border-collapse: collapse; font-size: .92rem; margin: 12px 0; display: block; overflow-x: auto; }
th, td { padding: 8px 10px; border: 1px solid var(--line); text-align: left; white-space: nowrap; }
th { background: var(--accent-soft); }
blockquote { margin: 12px 0; padding: 8px 14px; border-left: 4px solid var(--accent); background: var(--accent-soft); border-radius: 6px; }
.cta { margin-top: 28px; background: var(--accent-soft); border-radius: 12px; padding: 16px; }
.cta p { margin: 4px 0 10px; }
.btn { display: inline-block; background: var(--accent); color: #fff; padding: 10px 16px; border-radius: 10px; text-decoration: none; font-weight: 600; }
footer { color: var(--muted); font-size: .8rem; text-align: center; margin-top: 24px; }