:root, [data-theme="dark"] {
  --bg-grad-1: #0b1020;
  --bg-grad-2: #0f1530;
  --panel: rgba(18, 25, 53, 0.92);
  --panel-2: #1a2347;
  --text: #eef2ff;
  --muted: #a9b3d1;
  --line: #2a376d;
  --accent: #7aa2ff;
  --accent-2: #8ef0c8;
}
[data-theme="light"] {
  --bg-grad-1: #f4f7ff;
  --bg-grad-2: #eaf0ff;
  --panel: #ffffff;
  --panel-2: #f4f7ff;
  --text: #0f172a;
  --muted: #475569;
  --line: #d8dff0;
  --accent: #2d5bff;
  --accent-2: #0ea5e9;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, var(--bg-grad-1), var(--bg-grad-2));
  min-height: 100vh;
  line-height: 1.7;
}
a { color: var(--accent); }
.site-nav {
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: blur(8px);
  background: color-mix(in srgb, var(--panel) 85%, transparent);
  border-bottom: 1px solid var(--line);
}
.site-nav .inner {
  max-width: 1100px; margin: 0 auto;
  display: flex; flex-wrap: wrap; align-items: center; gap: 18px;
  padding: 12px 20px;
}
.site-nav .brand { font-weight: 700; font-size: 17px; text-decoration: none; color: var(--text); }
.site-nav .links { display: flex; flex-wrap: wrap; gap: 14px; margin-left: auto; }
.site-nav a.navlink { color: var(--muted); text-decoration: none; font-size: 14px; }
.site-nav a.navlink:hover { color: var(--accent); }
.page { max-width: 820px; margin: 32px auto; padding: 0 20px 60px; }
.page h1 { font-size: 28px; margin: 12px 0 8px; }
.page h2 { font-size: 20px; margin: 28px 0 10px; border-left: 4px solid var(--accent); padding-left: 10px; }
.page h3 { font-size: 16px; margin: 18px 0 6px; }
.page p, .page li { color: var(--text); }
.page .muted { color: var(--muted); }
.page .callout {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
  margin: 14px 0;
}
.page ul { padding-left: 22px; }
.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 40px;
  padding: 24px 20px;
  text-align: center;
  font-size: 13px;
  color: var(--muted);
}
.site-footer .links { margin-bottom: 8px; }
.site-footer a { color: var(--muted); margin: 0 8px; text-decoration: none; }
.site-footer a:hover { color: var(--accent); }