:root {
  color-scheme: dark;
  --bg: #070b14;
  --panel: rgba(255,255,255,.07);
  --line: rgba(148,163,184,.22);
  --text: #f8fafc;
  --muted: rgba(226,232,240,.72);
  --cyan: #4ce9ff;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: "Noto Sans KR", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 0%, rgba(76,233,255,.16), transparent 34rem),
    radial-gradient(circle at 85% 12%, rgba(157,252,124,.1), transparent 30rem),
    var(--bg);
}
a { color: inherit; text-decoration: none; }
.doc-topbar, .doc-shell { width: min(940px, calc(100% - 28px)); margin-inline: auto; }
.doc-topbar {
  position: sticky;
  top: 12px;
  z-index: 10;
  margin-top: 14px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 10px 12px;
  background: rgba(7,11,20,.82);
  backdrop-filter: blur(16px);
}
.doc-brand { font-weight: 950; }
.doc-nav { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.doc-nav a {
  border-radius: 999px;
  padding: 8px 11px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 850;
}
.doc-nav a:hover, .doc-nav a.is-active { background: rgba(255,255,255,.1); color: #fff; }
.doc-shell { margin-top: 22px; margin-bottom: 64px; }
.doc-hero, .doc-card {
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--panel);
  box-shadow: 0 18px 54px rgba(0,0,0,.24);
}
.doc-hero { padding: clamp(24px, 4vw, 42px); margin-bottom: 12px; }
.eyebrow {
  margin: 0 0 8px;
  color: var(--cyan);
  font-size: 12px;
  font-weight: 950;
  letter-spacing: .1em;
}
h1 { margin: 0 0 12px; font-size: clamp(34px, 5vw, 56px); letter-spacing: -.04em; }
.lead { margin: 0; max-width: 62ch; color: var(--muted); line-height: 1.7; }
.doc-grid { display: grid; gap: 12px; }
.doc-card { padding: 22px; }
.doc-card h2 { margin: 0 0 12px; font-size: 22px; }
.doc-card p, .doc-card li { color: var(--muted); line-height: 1.75; }
.doc-card ul { margin: 0; padding-left: 20px; }
.notice { border-color: rgba(76,233,255,.34); background: rgba(76,233,255,.08); }
.doc-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.doc-actions a {
  border: 1px solid rgba(76,233,255,.34);
  border-radius: 999px;
  padding: 9px 12px;
  color: var(--cyan);
  font-weight: 900;
  background: rgba(76,233,255,.1);
}
@media (max-width: 560px) {
  .doc-topbar { align-items: flex-start; flex-direction: column; }
  .doc-nav { justify-content: flex-start; }
  .doc-card { padding: 18px; }
}