:root {
  --navy: #0d1f2b;
  --deep: #0e222c;
  --ink: #1a2c38;
  --lime: #77ad47;
  --forest: #43835a;
  --teal: #1c6f6e;
  --paper: #f6f7f7;
  --white: #ffffff;
  --line: #d7ded8;
  --muted: #5c6b73;
  --warn: #8a4b12;
  --warn-bg: #f8efe4;
  --ok: #1f6b3a;
  --ok-bg: #e7f3ea;
  --shadow: 0 1px 0 rgba(13, 31, 43, 0.06);
  --max: 72rem;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Apple SD Gothic Neo", "Noto Serif KR", serif;
  --sans: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, system-ui, "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", sans-serif;
  --mono: "IBM Plex Mono", "SFMono-Regular", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  word-break: keep-all;
  overflow-wrap: break-word;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--teal); text-underline-offset: 0.18em; }
a:hover { color: var(--navy); }
code, .mono { font-family: var(--mono); font-size: 0.86em; }

.skip {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--navy);
  color: white;
  padding: 0.4rem 0.7rem;
}
.skip:focus { top: 0.6rem; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 4;
  background: var(--navy);
  color: white;
  border-bottom: 3px solid var(--lime);
}
.topbar-inner, .wrap { width: min(var(--max), calc(100% - 2rem)); margin: 0 auto; }
.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 3.4rem;
}
.brand {
  color: white;
  text-decoration: none;
  font-weight: 650;
  letter-spacing: 0;
}
.brand span { color: var(--lime); }
.topnav { display: flex; gap: 1rem; flex-wrap: wrap; }
.topnav a { color: #e7eee8; text-decoration: none; font-size: 0.92rem; }
.topnav a:hover { color: white; }

.hero {
  background: var(--navy);
  color: white;
  padding: 3.2rem 0 2.6rem;
}
.kicker {
  margin: 0 0 0.7rem;
  color: var(--lime);
  font-size: 0.82rem;
  letter-spacing: 0;
  text-transform: none;
}
h1, h2, h3 { font-family: var(--sans); letter-spacing: 0; line-height: 1.35; font-weight: 650; text-wrap: balance; }
h1 { margin: 0 0 0.8rem; font-size: clamp(1.8rem, 4vw, 2.6rem); max-width: 18em; }
.lede { max-width: 42rem; color: #d5e0d8; font-size: 1.08rem; }
.hero-actions { display: flex; gap: 0.7rem; flex-wrap: wrap; margin-top: 1.4rem; }
.btn {
  display: inline-block;
  text-decoration: none;
  border: 1px solid var(--lime);
  color: var(--navy);
  background: var(--lime);
  padding: 0.55rem 0.9rem;
  font-weight: 650;
}
.btn.ghost { background: transparent; color: white; border-color: #8aa0a8; }
.meta-row { display: flex; gap: 1.2rem; flex-wrap: wrap; margin-top: 1.6rem; color: #b7c6be; font-size: 0.88rem; }

.layout { display: grid; grid-template-columns: 15rem 1fr; gap: 2rem; padding: 2rem 0 4rem; }
.side {
  position: sticky;
  top: 4.4rem;
  align-self: start;
  max-height: calc(100vh - 5rem);
  overflow: auto;
  padding-right: 0.4rem;
}
.side a { display: block; color: var(--navy); text-decoration: none; padding: 0.28rem 0; font-size: 0.92rem; }
.side a:hover { color: var(--teal); }
.side .group { margin: 1rem 0 0.3rem; color: var(--muted); font-size: 0.8125rem; letter-spacing: 0; }

main section { margin: 0 0 3.2rem; scroll-margin-top: 4.6rem; }
h2 { font-size: 1.7rem; margin: 0 0 0.6rem; color: var(--navy); }
h3 { font-size: 1.2rem; margin: 1.4rem 0 0.4rem; color: var(--navy); }
p { margin: 0.5rem 0 0.8rem; }
.note, .warn, .ok {
  border-left: 3px solid var(--lime);
  background: white;
  padding: 0.8rem 1rem;
  margin: 0.8rem 0 1rem;
  box-shadow: var(--shadow);
}
.warn { border-color: var(--warn); background: var(--warn-bg); }
.ok { border-color: var(--ok); background: var(--ok-bg); }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); gap: 0.8rem; }
.card, .prompt, table, .shot {
  background: white;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.card { padding: 0.9rem 1rem; }
.card strong { display: block; color: var(--navy); margin-bottom: 0.25rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }

table { width: 100%; border-collapse: collapse; margin: 0.8rem 0 1.2rem; font-size: 0.95rem; }
th, td { text-align: left; vertical-align: top; padding: 0.55rem 0.7rem; border-bottom: 1px solid var(--line); }
th { background: #eef2ef; color: var(--navy); font-weight: 650; }
tr:last-child td { border-bottom: 0; }

.prompt {
  margin: 0.7rem 0 1rem;
  padding: 0.85rem 1rem;
}
.prompt .label {
  display: flex;
  justify-content: space-between;
  gap: 0.6rem;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0;
  margin-bottom: 0.35rem;
}
.prompt pre {
  margin: 0;
  white-space: pre-wrap;
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.7;
}

.swatches { display: flex; gap: 0.6rem; flex-wrap: wrap; margin: 0.8rem 0 1rem; }
.swatch { width: 7.2rem; background: white; border: 1px solid var(--line); }
.swatch i { display: block; height: 3.2rem; }
.swatch b, .swatch span { display: block; padding: 0.15rem 0.45rem; font-size: 0.78rem; }
.swatch b { color: var(--navy); }
.swatch span { color: var(--muted); font-family: var(--mono); }

.gallery { display: grid; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); gap: 0.8rem; }
.shot { overflow: hidden; }
.shot img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; background: #e7ece8; }
.shot figcaption { padding: 0.55rem 0.7rem 0.7rem; font-size: 0.88rem; color: var(--muted); }
.shot strong { color: var(--navy); display: block; }

.status { font-family: var(--mono); font-size: 0.78rem; }
footer.site {
  border-top: 1px solid var(--line);
  padding: 1.4rem 0 2rem;
  color: var(--muted);
  font-size: 0.88rem;
}

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .side { position: static; max-height: none; border-bottom: 1px solid var(--line); padding-bottom: 0.8rem; }
  .topnav { display: none; }
}

.layout > * { min-width: 0; }
:focus-visible { outline: 2px solid var(--navy); outline-offset: 2px; }
.topbar :focus-visible, .hero :focus-visible { outline-color: #ffffff; }

.search {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin: 0;
}
.search label { color: #e7eee8; font-size: 0.92rem; }
.search input {
  font: inherit;
  font-size: 1rem;
  color: var(--navy);
  background: #ffffff;
  border: 0;
  padding: 0.35rem 0.55rem;
  width: min(18rem, 52vw);
}

.chips { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0 0 0.8rem; }
.chips button {
  font: inherit;
  font-size: 0.95rem;
  color: var(--navy);
  background: #ffffff;
  border: 1px solid var(--line);
  padding: 0.35rem 0.7rem;
  cursor: pointer;
}
.chips button[aria-pressed="true"] {
  background: var(--navy);
  color: #ffffff;
  border-color: var(--navy);
}
.count { margin: 0 0 0.8rem; color: var(--muted); font-size: 0.95rem; }
.empty { margin: 1rem 0; color: var(--navy); }
.eyebrow {
  display: block;
  color: var(--muted);
  font-size: 0.875rem;
  margin-bottom: 0.2rem;
}
a.card { color: inherit; text-decoration: none; display: block; }
a.card:hover strong { color: var(--teal); }

.toc summary {
  cursor: pointer;
  color: var(--navy);
  font-weight: 650;
  padding: 0.2rem 0 0.6rem;
}
.crumb { color: var(--muted); font-size: 0.95rem; margin: 0 0 1rem; }
.crumb a { color: var(--teal); }
.pager {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2.2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}
.pager a { color: var(--navy); text-decoration: none; max-width: 46%; }
.pager a span { display: block; color: var(--muted); font-size: 0.95rem; margin-top: 0.15rem; }
.pager .next { margin-left: auto; text-align: right; }
.copy {
  margin-left: auto;
  font: inherit;
  font-size: 0.875rem;
  color: var(--navy);
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 0.15rem 0.5rem;
  cursor: pointer;
}
.prompt .label { align-items: center; }

@media (min-width: 861px) {
  .toc summary { display: none; }
}
@media (max-width: 860px) {
  .toc { border-bottom: 1px solid var(--line); margin-bottom: 1rem; }
  .toc:not([open]) .side { display: none; }
  .topbar-inner { flex-wrap: wrap; padding: 0.45rem 0; }
}