:root {
  --bg: #fafbfd;
  --surface: #ffffff;
  --text: #15191e;
  --muted: #3f4850;
  --primary: #1b5e8c;
  --primary-soft: #d3e8f8;
  --line: #e1e6eb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111417;
    --surface: #181c20;
    --text: #e2e6ea;
    --muted: #c2c9d0;
    --primary: #9ccbf0;
    --primary-soft: #004a72;
    --line: #2c3238;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Pretendard", "Noto Sans KR", "Malgun Gothic", "Apple SD Gothic Neo", sans-serif;
  font-size: 17px;
  line-height: 1.75;
  word-break: keep-all;
  overflow-wrap: anywhere;
}
a { color: var(--primary); }
a:focus-visible, button:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 16px; background: var(--surface); padding: 8px 12px; z-index: 10; }

header.site {
  background: var(--primary);
  color: #fff;
}
@media (prefers-color-scheme: dark) { header.site { background: #0f3a58; } }
header.site .inner {
  max-width: 820px; margin: 0 auto; padding: 14px 16px;
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
}
header.site a.brand { color: #fff; text-decoration: none; font-weight: 700; font-size: 20px; display: flex; align-items: center; gap: 10px; }
header.site img { width: 36px; height: 36px; border-radius: 9px; }
header.site nav { margin-left: auto; display: flex; gap: 4px; flex-wrap: wrap; }
header.site nav a { color: #fff; text-decoration: none; padding: 8px 10px; border-radius: 8px; font-size: 15px; min-height: 44px; display: inline-flex; align-items: center; }
header.site nav a[aria-current="page"], header.site nav a:hover { background: rgba(255,255,255,.18); }

main { max-width: 820px; margin: 0 auto; padding: 28px 16px 64px; }
h1 { font-size: 30px; line-height: 1.3; margin: 0 0 6px; }
h2 { font-size: 21px; line-height: 1.4; margin: 40px 0 10px; padding-top: 18px; border-top: 1px solid var(--line); }
h3 { font-size: 18px; margin: 24px 0 6px; }
.meta { color: var(--muted); margin: 0 0 24px; }
.lead { font-size: 18px; color: var(--muted); }
.note {
  background: var(--primary-soft); border-radius: 12px; padding: 14px 18px; margin: 18px 0;
}
ol, ul { padding-left: 1.4em; }
li { margin: 4px 0; }
table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 15px; background: var(--surface); }
th, td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; vertical-align: top; }
th { background: var(--primary-soft); }
.table-wrap { overflow-x: auto; }
nav.toc { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 12px 18px; margin: 20px 0; }
nav.toc ol { margin: 6px 0; }
footer.site { border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
footer.site .inner { max-width: 820px; margin: 0 auto; padding: 20px 16px 40px; }

/* 첫 화면 */
.hero { text-align: center; padding: 24px 0 8px; }
.hero img { width: 112px; height: 112px; border-radius: 26px; box-shadow: 0 6px 20px rgba(0,0,0,.15); }
.hero h1 { font-size: 36px; margin-top: 18px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 12px; margin: 28px 0; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; }
.card h3 { margin: 0 0 4px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.links { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin: 24px 0; }
.btn {
  display: inline-flex; align-items: center; min-height: 48px; padding: 0 20px; border-radius: 24px;
  background: var(--primary); color: #fff; text-decoration: none; font-weight: 600;
}
@media (prefers-color-scheme: dark) { .btn { color: #00324f; } }
.btn.outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }