:root {
  --bg: #0f1218;
  --panel: #171c25;
  --line: #2a3140;
  --fg: #e6e9ef;
  --muted: #98a2b3;
  --accent: #5aa9ff;
  --accent-fg: #0b1220;
  --max: 760px;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #ffffff;
    --panel: #f5f7fa;
    --line: #dde3ea;
    --fg: #1a1f2b;
    --muted: #5b6474;
    --accent: #1a6fe0;
    --accent-fg: #ffffff;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, "Segoe UI", "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

header, main, footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 16px;
}
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 20px;
  padding-bottom: 20px;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--fg); font-weight: 700; }
.brand img { width: 28px; height: 28px; border-radius: 7px; }
nav { display: flex; gap: 18px; font-size: 15px; }
nav a { color: var(--muted); }
nav a[aria-current="page"] { color: var(--fg); font-weight: 600; }

main { padding-bottom: 48px; }
h1 { font-size: 34px; line-height: 1.25; margin: 28px 0 10px; }
h2 { font-size: 22px; margin: 36px 0 10px; }
h3 { font-size: 17px; margin: 22px 0 6px; }
p.lead { font-size: 19px; color: var(--muted); margin: 0 0 22px; }
p, li { margin: 6px 0; }
ol, ul { padding-left: 22px; }
code, kbd {
  font: 14px/1.5 ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1px 6px;
}
pre {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  overflow-x: auto;
}
pre code { border: 0; padding: 0; background: none; }

.btn {
  display: inline-block;
  background: var(--accent);
  color: var(--accent-fg);
  font-weight: 600;
  padding: 10px 18px;
  border-radius: 8px;
}
.btn:hover { text-decoration: none; filter: brightness(1.08); }
.btn.ghost { background: transparent; color: var(--accent); border: 1px solid var(--line); }

.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 18px 0; }
@media (max-width: 600px) { .grid { grid-template-columns: 1fr; } }
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px 18px;
}
.card h3 { margin-top: 0; }
.card p { color: var(--muted); margin-bottom: 0; }

.note {
  border-left: 3px solid var(--accent);
  background: var(--panel);
  padding: 10px 14px;
  border-radius: 0 8px 8px 0;
  color: var(--muted);
  margin: 16px 0;
}
table { border-collapse: collapse; width: 100%; margin: 12px 0; font-size: 15px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }

footer {
  border-top: 1px solid var(--line);
  padding-top: 18px;
  padding-bottom: 32px;
  color: var(--muted);
  font-size: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}