:root {
  --bg: #f7f7f5;
  --surface: #ffffff;
  --text: #1c1d1f;
  --muted: #62656b;
  --line: #e4e4e0;
  --accent: #1f6feb;
  --accent-soft: #e8f0fe;
  --shadow: 0 1px 2px rgba(0,0,0,.04), 0 4px 16px rgba(0,0,0,.04);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #131416;
    --surface: #1b1c1f;
    --text: #ececea;
    --muted: #9a9ca1;
    --line: #2c2e32;
    --accent: #6ea8ff;
    --accent-soft: #1d2b44;
    --shadow: none;
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.6 "Pretendard", "Apple SD Gothic Neo", "Malgun Gothic", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased; word-break: keep-all;
}
a { color: inherit; text-decoration: none; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 16px; }

.top {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px); border-bottom: 1px solid var(--line);
}
.top-in { display: flex; align-items: center; gap: 24px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: .02em; flex-shrink: 0; }
.mark {
  width: 28px; height: 28px; border-radius: 8px; display: grid; place-items: center;
  background: var(--accent); color: #fff; font-size: 15px;
}
.nav { display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; }
.nav a { padding: 6px 12px; border-radius: 999px; color: var(--muted); font-size: 15px; white-space: nowrap; }
.nav a:hover { background: var(--accent-soft); color: var(--accent); }

.hero { padding: 56px 0 32px; }
.hero h1 { font-size: clamp(24px, 4vw, 34px); line-height: 1.3; margin: 0 0 20px; font-weight: 700; }
.search {
  display: flex; align-items: center; gap: 10px; max-width: 520px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 0 14px;
}
.search:focus-within { border-color: var(--accent); }
.search svg { width: 18px; height: 18px; fill: none; stroke: var(--muted); stroke-width: 2; stroke-linecap: round; flex-shrink: 0; }
.search input { flex: 1; min-width: 0; border: 0; background: none; color: inherit; font: inherit; padding: 12px 0; outline: none; }

.sec { padding: 24px 0 16px; }
.sec-head { display: flex; align-items: baseline; gap: 10px; }
.sec h2 { margin: 0; font-size: 20px; }
.count { color: var(--muted); font-size: 14px; }
.sec-desc { margin: 4px 0 16px; color: var(--muted); font-size: 15px; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.card {
  display: flex; flex-direction: column; gap: 6px; padding: 16px 18px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow);
  transition: border-color .15s, transform .15s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.card-top { display: flex; justify-content: space-between; align-items: center; min-height: 22px; }
.tag { font-size: 12px; font-weight: 600; color: var(--accent); background: var(--accent-soft); padding: 2px 8px; border-radius: 6px; }
.ext { color: var(--muted); font-size: 14px; margin-left: auto; }
.card h3 { margin: 0; font-size: 16px; line-height: 1.45; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }
.card time { margin-top: auto; padding-top: 4px; color: var(--muted); font-size: 13px; font-variant-numeric: tabular-nums; }
.empty { color: var(--muted); font-size: 15px; margin: 0; padding: 18px; border: 1px dashed var(--line); border-radius: 14px; }

.foot { padding: 48px 16px 40px; color: var(--muted); font-size: 14px; }

.doc { max-width: 720px; padding-top: 48px; padding-bottom: 48px; }
.doc h1 { font-size: 28px; margin: 0 0 16px; }
.doc code { background: var(--accent-soft); padding: 1px 6px; border-radius: 4px; font-size: 14px; }
.doc pre { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 14px; overflow-x: auto; font-size: 14px; }
.doc a.back { color: var(--accent); }

@media (max-width: 560px) {
  .top-in { gap: 12px; }
  .hero { padding: 36px 0 20px; }
}