:root {
  --paper: #fffdfc;
  --ink: #1f2937;
  --muted: #6b7280;
  --pink: #e83e8c;
  --pink-deep: #b91c5c;
  --pink-pale: #fff1f7;
  --pink-line: #f4d4e2;
  --navy: #17324d;
  --maxw: 880px;
  --radius: 10px;
  color-scheme: light;
  font-size: 17px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    "Apple SD Gothic Neo", "Noto Sans KR", Arial, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.skip-link {
  position: absolute;
  left: -999px;
}
.skip-link:focus {
  left: 12px;
  top: 12px;
  background: var(--pink-deep);
  color: #fff;
  padding: 8px 12px;
  border-radius: 8px;
  z-index: 20;
}

/* Top bar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px max(20px, calc((100% - var(--maxw)) / 2));
  background: rgba(255, 253, 252, 0.92);
  backdrop-filter: saturate(1.2) blur(6px);
  border-bottom: 1px solid var(--pink-line);
}
.wordmark {
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
}
.wordmark span { color: var(--pink); }
.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  margin-left: auto;
}
.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
}
.nav a:hover { color: var(--pink-deep); }
.lang-switch {
  display: inline-flex;
  border: 1px solid var(--pink-line);
  border-radius: 999px;
  overflow: hidden;
}
.lang-switch button {
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  padding: 5px 12px;
  cursor: pointer;
}
.lang-switch button.is-active {
  background: var(--pink);
  color: #fff;
}

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px 64px;
}

/* Hero */
.hero {
  padding: 64px 0 28px;
  border-bottom: 1px solid var(--pink-line);
}
.eyebrow {
  margin: 0 0 14px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--pink-deep);
}
.title {
  margin: 0;
  font-size: clamp(3.4rem, 12vw, 6rem);
  line-height: 0.96;
  letter-spacing: -0.04em;
  font-weight: 800;
  color: var(--ink);
}
.title span { color: var(--pink); }
.lede {
  margin: 18px 0 0;
  font-size: clamp(1.3rem, 4vw, 1.7rem);
  font-weight: 600;
  color: var(--navy);
  max-width: 46ch;
}
.abstract {
  margin: 18px 0 0;
  color: #374151;
  max-width: 64ch;
}
.links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}
.btn {
  display: inline-block;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid var(--pink-line);
  background: #fff;
  color: var(--pink-deep);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 700;
}
.btn:hover { border-color: var(--pink); background: var(--pink-pale); }
.btn.primary {
  background: var(--pink);
  border-color: var(--pink);
  color: #fff;
}
.btn.primary:hover { background: var(--pink-deep); }

/* Disclaimer */
.disclaimer {
  margin: 22px 0 0;
  padding: 14px 18px;
  background: var(--pink-pale);
  border: 1px solid var(--pink-line);
  border-left: 4px solid var(--pink);
  border-radius: var(--radius);
  font-size: 0.9rem;
  color: #4b5563;
}

/* Sections */
.band {
  padding: 42px 0;
  border-bottom: 1px solid #f3eef0;
}
.band h2 {
  margin: 0 0 6px;
  font-size: clamp(1.5rem, 5vw, 1.95rem);
  letter-spacing: -0.02em;
  color: var(--ink);
}
.band h2::after {
  content: "";
  display: block;
  width: 44px;
  height: 3px;
  margin-top: 10px;
  background: var(--pink);
  border-radius: 3px;
}
.band > p { margin: 12px 0; color: #374151; max-width: 66ch; }
.sub { color: var(--muted) !important; }
.course-note {
  font-size: 0.92rem;
  color: var(--muted) !important;
}

/* Grids */
.grid4, .grid3 {
  display: grid;
  gap: 16px;
  margin-top: 18px;
}
.grid4 { grid-template-columns: repeat(2, 1fr); }
.grid3 { grid-template-columns: 1fr; }
.grid4 article, .grid3 article {
  padding: 16px 18px;
  border: 1px solid var(--pink-line);
  border-radius: var(--radius);
  background: #fff;
}
.grid4 h3, .grid3 h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 6px;
  font-size: 1.02rem;
  color: var(--pink-deep);
}
.out-n {
  flex: none;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--pink-pale);
  border: 1px solid var(--pink-line);
  color: var(--pink-deep);
  font-size: 0.74rem;
  font-weight: 800;
}
.grid4 p, .grid3 p { margin: 0; font-size: 0.92rem; color: #4b5563; }

/* Pipeline flow diagram */
.flow {
  list-style: none;
  margin: 24px auto 0;
  padding: 0;
  max-width: 520px;
}
.flow li {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--pink-line);
  border-radius: var(--radius);
  background: #fff;
}
.flow li + li { margin-top: 28px; }
.flow li + li::before {
  content: "";
  position: absolute;
  top: -23px;
  left: 28px;
  width: 2px;
  height: 16px;
  background: var(--pink);
}
.flow li + li::after {
  content: "";
  position: absolute;
  top: -9px;
  left: 23px;
  border: 6px solid transparent;
  border-top-color: var(--pink);
}
.flow li:last-child {
  border-color: var(--pink);
  background: var(--pink-pale);
}
.step-n {
  flex: none;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--pink);
  color: #fff;
  font-weight: 800;
  font-size: 0.82rem;
}
.step-t {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--ink);
}

/* Contained brand image */
.brand {
  margin: 26px 0 0;
  text-align: center;
}
.brand img {
  width: 100%;
  max-width: 320px;
  height: auto;
  border: 1px solid var(--pink-line);
  border-radius: var(--radius);
}

/* Demo run block */
.run {
  margin-top: 18px;
  border: 1px solid var(--pink-line);
  border-radius: var(--radius);
  overflow: hidden;
}
.run-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 16px;
  background: var(--pink-pale);
}
.run-title {
  margin: 0;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--pink-deep);
}
.copy-btn {
  border: 1px solid var(--pink-line);
  background: #fff;
  color: var(--pink-deep);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
  cursor: pointer;
}
.copy-btn:hover { border-color: var(--pink); }
.copy-btn.is-done { background: var(--pink); border-color: var(--pink); color: #fff; }
.run-foot {
  margin: 0;
  padding: 10px 16px;
  font-size: 0.82rem;
  color: var(--muted);
  border-top: 1px solid var(--pink-line);
}
.run-foot a { color: var(--pink-deep); font-weight: 600; }
pre {
  margin: 0;
  padding: 16px;
  overflow-x: auto;
  background: #1f2330;
  color: #f5e9f0;
  font-size: 0.85rem;
  line-height: 1.6;
}
pre code { font-family: "SFMono-Regular", Menlo, Consolas, monospace; }
.run-note {
  margin: 0;
  padding: 12px 16px;
  font-size: 0.86rem;
  color: var(--muted);
}

/* Tables */
.table-wrap {
  margin: 14px 0;
  overflow-x: auto;
  border: 1px solid var(--pink-line);
  border-radius: var(--radius);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
  min-width: 560px;
}
caption {
  caption-side: top;
  text-align: left;
  padding: 10px 14px;
  font-size: 0.82rem;
  color: var(--muted);
  background: var(--pink-pale);
}
th, td {
  padding: 9px 14px;
  text-align: left;
  border-top: 1px solid #f1e6ec;
  vertical-align: top;
}
th {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--pink-deep);
  background: #fff;
}
tbody tr:nth-child(even) { background: #fffafc; }
.empty-row td { color: var(--muted); font-style: italic; }
.status-pill {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 999px;
  background: var(--pink-pale);
  color: var(--pink-deep);
  font-size: 0.74rem;
  font-weight: 700;
}
h3.mini {
  margin: 26px 0 0;
  font-size: 1.05rem;
  color: var(--ink);
}
.figtags { display: flex; flex-wrap: wrap; gap: 8px; margin: 6px 0 0; }
.figtag {
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--pink-deep);
  background: var(--pink-pale);
  border: 1px solid var(--pink-line);
  border-radius: 999px;
  padding: 3px 10px;
}

/* BibTeX */
.bibtex {
  background: #fff;
  color: #374151;
  border: 1px solid var(--pink-line);
}
.bibtex code { font-family: "SFMono-Regular", Menlo, Consolas, monospace; white-space: pre; }

/* Worked example */
.example {
  margin: 18px 0 0;
  border: 1px solid var(--pink-line);
  border-radius: var(--radius);
  overflow: hidden;
}
.example figcaption {
  padding: 8px 16px;
  background: var(--pink-pale);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--pink-deep);
}
.example .clause {
  margin: 0;
  padding: 16px 16px 4px;
  font-weight: 600;
  color: var(--ink);
}
.example .clause-gloss {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 0.9rem;
  color: var(--muted);
}
.example .table-wrap {
  margin: 0;
  border: 0;
  border-top: 1px solid var(--pink-line);
  border-radius: 0;
}
.example table { min-width: 0; }
.example td:first-child, .example th:first-child { width: 34%; font-weight: 700; color: var(--ink); }

/* Footer */
.site-footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 28px 20px 56px;
  color: var(--muted);
  font-size: 0.85rem;
}
.site-footer p { margin: 4px 0; }

@media (min-width: 720px) {
  .grid4 { grid-template-columns: repeat(4, 1fr); }
  .grid3 { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 600px) {
  .nav { display: none; }
  .hero { padding-top: 40px; }
  main { padding-bottom: 40px; }
}