:root {
  --ink: #182230;
  --muted: #64748b;
  --line: #dbe3ed;
  --canvas: #f5f7fb;
  --surface: #ffffff;
  --navy: #172554;
  --blue: #2563eb;
  --cyan: #0891b2;
  --code: #0f172a;
  font-family: Inter, Pretendard, "Noto Sans KR", system-ui, sans-serif;
  color: var(--ink);
  background: var(--canvas);
}

* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; }
button, input { font: inherit; }

.topbar {
  align-items: center;
  background: var(--navy);
  color: white;
  display: flex;
  height: 64px;
  justify-content: space-between;
  padding: 0 28px;
}
.brand { align-items: center; color: inherit; display: flex; font-size: 1.05rem; font-weight: 500; gap: 10px; text-decoration: none; }
.brand-mark { align-items: center; background: #38bdf8; border-radius: 8px; color: var(--navy); display: inline-flex; font-weight: 800; height: 30px; justify-content: center; width: 30px; }
.format-version { color: #cbd5e1; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .78rem; }

.layout { display: grid; grid-template-columns: minmax(245px, 290px) minmax(0, 1fr); margin: 0 auto; max-width: 1540px; min-height: calc(100vh - 64px); }
.sidebar { background: var(--surface); border-right: 1px solid var(--line); padding: 26px 18px; }
.search-label, .nav-group-title { color: var(--muted); display: block; font-size: .73rem; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; }
#search { border: 1px solid var(--line); border-radius: 8px; margin: 8px 0 22px; outline-color: var(--blue); padding: 10px 11px; width: 100%; }
.nav-group { margin: 0 0 20px; }
.nav-group-title { margin: 0 0 7px 9px; }
.nav-item { background: none; border: 0; border-radius: 7px; color: #334155; cursor: pointer; display: block; font-size: .87rem; overflow: hidden; padding: 8px 10px; text-align: left; text-overflow: ellipsis; white-space: nowrap; width: 100%; }
.nav-item:hover { background: #eff6ff; color: #1d4ed8; }
.nav-item.active { background: #dbeafe; color: #1d4ed8; font-weight: 700; }
.nav-empty { color: var(--muted); font-size: .84rem; padding: 7px 10px; }

.content { min-width: 0; padding: 46px clamp(25px, 5vw, 78px) 80px; }
.hero { border-bottom: 1px solid var(--line); margin-bottom: 34px; padding-bottom: 32px; }
.eyebrow { color: var(--blue); font-size: .72rem; font-weight: 800; letter-spacing: .11em; margin: 0 0 10px; }
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(1.9rem, 4vw, 2.75rem); letter-spacing: -.04em; margin-bottom: 12px; }
h2 { font-size: 1.55rem; letter-spacing: -.025em; margin-bottom: 8px; }
h3 { font-size: 1rem; margin-bottom: 7px; }
.hero > p:not(.eyebrow), .description { color: #475569; line-height: 1.7; white-space: pre-wrap; }
.counts { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.count-card { background: var(--surface); border: 1px solid var(--line); border-radius: 9px; min-width: 104px; padding: 11px 13px; }
.count-card strong { color: var(--blue); display: block; font-size: 1.22rem; }
.count-card span { color: var(--muted); font-size: .78rem; }

.kind { color: var(--cyan); font-size: .74rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.meta { color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .82rem; margin: 10px 0 24px; }
.schema-section { background: var(--surface); border: 1px solid var(--line); border-radius: 11px; margin: 18px 0; overflow: hidden; }
.schema-heading { align-items: baseline; border-bottom: 1px solid var(--line); display: flex; gap: 10px; justify-content: space-between; padding: 16px 18px; }
.schema-heading code { color: var(--muted); font-size: .78rem; }
.schema-summary { overflow-x: auto; padding: 0 18px 8px; }
table { border-collapse: collapse; font-size: .86rem; min-width: 650px; width: 100%; }
th { color: var(--muted); font-size: .73rem; letter-spacing: .04em; text-align: left; text-transform: uppercase; }
td, th { border-bottom: 1px solid #edf2f7; padding: 11px 8px; vertical-align: top; }
td code, .type { background: #eff6ff; border-radius: 4px; color: #1d4ed8; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .78rem; padding: 2px 5px; }
.required { color: #b91c1c; font-size: .75rem; font-weight: 700; }
.optional { color: var(--muted); font-size: .75rem; }
details { border-top: 1px solid var(--line); }
summary { cursor: pointer; font-size: .84rem; font-weight: 650; padding: 13px 18px; }
pre { background: var(--code); color: #dbeafe; font-size: .76rem; line-height: 1.55; margin: 0; overflow: auto; padding: 16px 18px; tab-size: 2; }
.definitions { display: grid; gap: 10px; padding: 15px 18px; }
.definition { border: 1px solid var(--line); border-radius: 8px; padding: 12px; }
.definition h3 { margin: 0 0 7px; }
.definition .description { font-size: .86rem; margin: 0; }
.loading, .error { color: var(--muted); padding: 80px 0; text-align: center; }
.error { color: #b91c1c; }

@media (max-width: 760px) {
  .topbar { padding: 0 16px; }
  .format-version { display: none; }
  .layout { display: block; }
  .sidebar { border-bottom: 1px solid var(--line); border-right: 0; padding: 18px 16px; }
  .navigation { display: flex; gap: 14px; overflow-x: auto; }
  .nav-group { flex: 0 0 190px; }
  .content { padding: 30px 18px 54px; }
}