:root {
  --bg: #f5f1ea;
  --bg-strong: #ece4d6;
  --surface: #fffdf9;
  --surface-alt: #f7f3eb;
  --ink: #162320;
  --muted: #55615b;
  --line: rgba(18, 35, 32, 0.12);
  --accent: #0d5b55;
  --accent-strong: #09453f;
  --accent-soft: rgba(13, 91, 85, 0.1);
  --shadow: 0 18px 48px rgba(14, 33, 30, 0.08);
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;
  --shell: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "IBM Plex Sans", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top, rgba(13, 91, 85, 0.08), transparent 26rem),
    linear-gradient(180deg, #fcfaf6 0%, var(--bg) 100%);
}

a {
  color: inherit;
}

img {
  display: block;
  width: 100%;
  height: auto;
}

.shell {
  width: min(calc(100% - 2rem), var(--shell));
  margin: 0 auto;
}

.site-header {
  padding: 1rem 0 2rem;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 0 1rem;
}

.brand {
  font-family: "Source Serif 4", serif;
  font-size: 1.25rem;
  font-weight: 700;
  text-decoration: none;
}

.section-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.section-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.96rem;
}

.hero {
  display: block;
}

.hero-copy {
  background: rgba(255, 253, 249, 0.86);
  border: 1px solid rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  border-radius: var(--radius-lg);
  width: 100%;
}

.hero-copy {
  padding: 2.8rem;
}

.hero h1,
.section-head h2,
.step-card h3,
.highlight-card h3,
.analysis-card h3,
.table-card h3 {
  font-family: "Source Serif 4", serif;
  letter-spacing: -0.02em;
}

.hero h1 {
  margin: 0.2rem 0 1rem;
  font-size: clamp(2.15rem, 4vw, 3.65rem);
  line-height: 0.95;
}

.hero-summary,
.content-card p,
.step-card p,
.highlight-card p,
.table-note,
.site-footer p,
.meta-note,
.affiliation {
  color: var(--muted);
}

.eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
}

.authors {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.2rem;
  font-weight: 600;
  margin-top: 1.6rem;
}

.affiliation,
.meta-note {
  margin: 0.45rem 0 0;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.8rem;
}

.release-note {
  margin: 0.85rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  padding: 0.8rem 1.15rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  text-decoration: none;
  font-weight: 600;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  background: var(--accent);
  color: white;
  border-color: transparent;
}

.button-primary:hover {
  background: var(--accent-strong);
}

.button-secondary {
  background: white;
}

.button[aria-disabled="true"] {
  opacity: 0.55;
  pointer-events: none;
}

.step-card,
.highlight-card,
.analysis-card,
.content-card,
.citation-card,
.table-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 28px rgba(16, 34, 31, 0.05);
}

.section {
  padding: 1.5rem 0 3.5rem;
}

.section-alt {
  background: linear-gradient(180deg, rgba(236, 228, 214, 0.34), rgba(236, 228, 214, 0.1));
  border-top: 1px solid rgba(13, 91, 85, 0.07);
  border-bottom: 1px solid rgba(13, 91, 85, 0.07);
}

.section-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.25fr);
  gap: 1.5rem;
  align-items: start;
}

.section-head {
  margin-bottom: 1.5rem;
}

.section-head h2 {
  margin: 0.3rem 0 0;
  font-size: clamp(2rem, 3.2vw, 3rem);
  line-height: 1.02;
}

.content-card,
.table-card,
.citation-card {
  padding: 1.5rem;
}

.hero-abstract {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}

.hero-abstract-body {
  color: var(--muted);
}

.hero-abstract-body p {
  margin: 0.8rem 0 0;
}

.content-card p:first-child,
.step-card p,
.highlight-card p,
.analysis-card .stat-list,
.table-card h3,
.citation-card pre {
  margin-top: 0;
}

.content-card-split {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(240px, 0.8fr);
  gap: 1rem;
  align-items: start;
}

.status-box {
  padding: 1rem 1.1rem;
  border-radius: var(--radius-sm);
  background: var(--surface-alt);
  border: 1px solid var(--line);
}

.status-label {
  display: block;
  margin-bottom: 0.45rem;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--accent);
  font-weight: 700;
}

.step-grid,
.highlight-grid,
.analysis-grid,
.gallery-grid,
.algorithm-grid,
.visual-grid {
  display: grid;
  gap: 1rem;
}

.step-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-bottom: 1.4rem;
}

.step-card,
.highlight-card,
.analysis-card {
  padding: 1.35rem;
}

.step-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.1rem;
  height: 2.1rem;
  margin-bottom: 0.8rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 700;
}

.visual-grid {
  grid-template-columns: 1fr;
  max-width: 920px;
  margin: 0 auto;
}

.algorithm-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 1.2rem;
  align-items: start;
}

.algorithm-figure {
  margin: 0;
}

.highlight-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-bottom: 1.4rem;
}

.analysis-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 1.4rem;
}

.pdf-figure {
  margin: 0;
}

.pdf-frame {
  background: white;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.figure-image {
  width: 100%;
  height: auto;
}

.pdf-frame figcaption,
.pdf-figure figcaption {
  color: var(--muted);
}

.pdf-figure figcaption {
  margin-top: 0.7rem;
  font-size: 0.95rem;
  line-height: 1.55;
}

.pdf-figure-hero .pdf-frame {
  min-height: 340px;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 0.9rem 0.85rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  white-space: nowrap;
}

th {
  color: var(--muted);
  font-size: 0.92rem;
}

.table-group td {
  padding-top: 1rem;
  padding-bottom: 0.7rem;
  background: #f1ece3;
  color: var(--accent-strong);
  font-weight: 700;
  border-bottom: 1px solid rgba(13, 91, 85, 0.18);
}

.row-accent {
  background: var(--accent-soft);
}

.table-divider td {
  border-top: 1px dashed rgba(13, 91, 85, 0.28);
}

.table-note {
  margin-bottom: 0;
}

.stat-list {
  padding-left: 1.15rem;
  color: var(--muted);
}

.stat-list li + li {
  margin-top: 0.5rem;
}

.gallery-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 1.2rem;
}

.gallery-item .pdf-frame {
  min-height: 220px;
}

.citation-card {
  position: relative;
}

.copy-button {
  position: absolute;
  top: 1.1rem;
  right: 1.1rem;
  border: 1px solid var(--line);
  background: white;
  border-radius: 999px;
  padding: 0.7rem 1rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

pre {
  margin: 0;
  padding: 1.1rem;
  background: #161f1d;
  color: #f6f8f7;
  border-radius: var(--radius-sm);
  overflow-x: auto;
}

code {
  font-family: "IBM Plex Sans", sans-serif;
}

.site-footer {
  padding: 1rem 0 2.5rem;
}

.footer-grid {
  display: grid;
  gap: 0.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

@media (max-width: 980px) {
  .section-grid,
  .content-card-split,
  .step-grid,
  .highlight-grid,
  .analysis-grid,
  .algorithm-grid,
  .visual-grid,
  .gallery-grid {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    padding: 2rem;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .section-nav {
    gap: 0.8rem;
  }
}

@media (max-width: 640px) {
  .shell {
    width: min(calc(100% - 1.2rem), var(--shell));
  }

  .section {
    padding: 1rem 0 2.4rem;
  }

  .hero h1 {
    font-size: 2.35rem;
  }

  .hero-copy {
    padding: 1.35rem;
  }

  .hero-actions,
  .authors {
    flex-direction: column;
    align-items: flex-start;
  }

  th,
  td {
    padding: 0.75rem 0.65rem;
  }

  .copy-button {
    position: static;
    margin-bottom: 1rem;
  }
}