:root {
  --bg: #07101f;
  --panel: rgba(15, 23, 42, 0.86);
  --border: rgba(148, 163, 184, 0.18);
  --text: #e5edf7;
  --muted: #9aa9bd;
  --cyan: #22d3ee;
  --emerald: #34d399;
  --amber: #fbbf24;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 5%, rgba(34, 211, 238, 0.1), transparent 32%),
    radial-gradient(circle at 90% 20%, rgba(52, 211, 153, 0.08), transparent 28%),
    var(--bg);
  font-family: "Noto Sans KR", sans-serif;
  line-height: 1.75;
}

a { color: var(--cyan); }
.content-shell { width: min(1040px, calc(100% - 32px)); margin: 0 auto; }
.content-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}
.content-brand { color: var(--text); text-decoration: none; font: 800 1.25rem "Outfit", sans-serif; }
.content-nav { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.content-nav a {
  padding: 0.45rem 0.72rem;
  color: var(--muted);
  text-decoration: none;
  border-radius: 8px;
}
.content-nav a:hover, .content-nav a[aria-current="page"] { color: var(--text); background: rgba(34, 211, 238, 0.1); }
.content-hero { padding: 4.5rem 0 2.5rem; max-width: 820px; }
.content-kicker { color: var(--emerald); font: 700 0.78rem "Outfit", sans-serif; letter-spacing: 0.1em; text-transform: uppercase; }
.content-hero h1 { margin: 0.45rem 0 1rem; font-size: clamp(2rem, 5vw, 3.5rem); line-height: 1.18; letter-spacing: -0.04em; }
.content-hero p { color: var(--muted); font-size: 1.08rem; }
.content-layout { display: grid; grid-template-columns: minmax(0, 1fr) 240px; gap: 2.25rem; padding-bottom: 4rem; }
.content-article { min-width: 0; }
.content-article section { margin: 0 0 1.25rem; padding: 1.6rem; background: var(--panel); border: 1px solid var(--border); border-radius: 16px; }
.content-article h2 { margin: 0 0 0.8rem; font-size: 1.45rem; line-height: 1.35; }
.content-article h3 { margin: 1.4rem 0 0.5rem; color: #c8f6ff; font-size: 1.05rem; }
.content-article p { margin: 0.65rem 0; color: #cbd5e1; }
.content-article li { margin: 0.45rem 0; color: #cbd5e1; }
.content-article strong { color: #f8fafc; }
.content-note { border-left: 3px solid var(--amber); padding-left: 1rem; color: #fde68a !important; }
.content-toc { position: sticky; top: 1rem; align-self: start; padding: 1.2rem; border: 1px solid var(--border); border-radius: 14px; background: rgba(15, 23, 42, 0.65); }
.content-toc strong { display: block; margin-bottom: 0.65rem; }
.content-toc a { display: block; padding: 0.35rem 0; color: var(--muted); text-decoration: none; font-size: 0.86rem; }
.content-toc a:hover { color: var(--cyan); }
.content-meta { color: var(--muted); font-size: 0.82rem; }
.content-footer { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; padding: 1.5rem 0 2.5rem; border-top: 1px solid var(--border); color: var(--muted); font-size: 0.82rem; }
.content-footer nav { display: flex; flex-wrap: wrap; gap: 0.9rem; }
.content-footer a { color: var(--muted); }
.faq-item + .faq-item { margin-top: 1.4rem; padding-top: 1.4rem; border-top: 1px solid var(--border); }

@media (max-width: 760px) {
  .content-header { align-items: flex-start; flex-direction: column; }
  .content-layout { grid-template-columns: 1fr; }
  .content-toc { position: static; order: -1; }
  .content-hero { padding-top: 3rem; }
}