:root {
  --bg: #f4efe6;
  --ink: #14222b;
  --ink-soft: #31424d;
  --accent: #b34a2b;
  --accent-2: #176087;
  --panel: rgba(255, 255, 255, 0.78);
  --line: rgba(20, 34, 43, 0.14);
  --radius: 16px;
  --shadow: 0 18px 40px rgba(20, 34, 43, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 10%, rgba(179, 74, 43, 0.17), transparent 34%),
    radial-gradient(circle at 90% 20%, rgba(23, 96, 135, 0.18), transparent 36%),
    linear-gradient(180deg, #f8f3eb 0%, #efe5d7 52%, #e8dccd 100%);
  min-height: 100vh;
  line-height: 1.5;
}

.ambient-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 20% 80%, rgba(179, 74, 43, 0.09), transparent 30%),
    radial-gradient(circle at 78% 70%, rgba(23, 96, 135, 0.1), transparent 28%);
}

.hero,
main,
.footnote {
  width: min(980px, 92vw);
  margin: 0 auto;
}

.hero {
  padding: 4.5rem 0 2.8rem;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.17em;
  font-size: 0.76rem;
  color: var(--accent-2);
  margin: 0 0 0.6rem;
}

h1,
h2,
h3 {
  font-family: "Cormorant Garamond", Georgia, serif;
  line-height: 1.08;
  margin: 0;
}

h1 {
  font-size: clamp(2.2rem, 5.5vw, 4.2rem);
  font-weight: 700;
  max-width: 19ch;
}

.lead {
  margin: 1rem 0 1.2rem;
  color: var(--ink-soft);
  max-width: 64ch;
  font-size: 1.1rem;
}

.hero-link {
  display: inline-block;
  text-decoration: none;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(120deg, var(--accent), #cb6a31);
  padding: 0.62rem 1.05rem;
  border-radius: 999px;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.hero-link:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(179, 74, 43, 0.33);
}

.hero-link-secondary {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(20, 34, 43, 0.12);
  box-shadow: 0 8px 20px rgba(20, 34, 43, 0.1);
}

.hero-link-secondary:hover {
  box-shadow: 0 10px 24px rgba(20, 34, 43, 0.16);
}

main {
  padding-bottom: 2.2rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  border-radius: var(--radius);
  padding: 1.3rem 1.15rem;
  margin: 1rem 0;
  backdrop-filter: blur(4px);
}

h2 {
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  margin-bottom: 0.6rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 0.9rem;
  margin-top: 1rem;
}

.card {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.85);
  padding: 0.9rem;
}

.card h3 {
  margin-bottom: 0.38rem;
  font-size: 1.6rem;
}

.nature {
  grid-column: span 12;
  border-left: 6px solid var(--accent-2);
}

.person {
  grid-column: span 4;
}

.ref {
  margin-top: 0.55rem;
  font-size: 0.88rem;
  color: #3f4b53;
}

.relation {
  margin-top: 0.6rem;
  color: #1f2f39;
  font-weight: 600;
  border-top: 1px dashed rgba(20, 34, 43, 0.18);
  padding-top: 0.52rem;
}

.closure-box {
  margin-top: 0.6rem;
  border-left: 5px solid var(--accent);
  background: rgba(179, 74, 43, 0.07);
  border-radius: 10px;
  padding: 0.7rem 0.8rem;
}

.lds-unity-card {
  border-left-color: #176087;
}

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
  margin-top: 0.85rem;
}

.comparison-grid > div {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.82);
  padding: 0.85rem;
}

.comparison-grid h3 {
  font-size: 1.35rem;
  margin-bottom: 0.35rem;
}

.comparison-grid p {
  margin: 0;
}

.uml-diagram {
  margin-top: 0.7rem;
  border: 1px solid rgba(20, 34, 43, 0.2);
  border-radius: 12px;
  background: #ffffff;
  box-shadow: 0 10px 22px rgba(20, 34, 43, 0.1);
  padding: 0.9rem;
  overflow-x: auto;
}

.uml-diagram .mermaid {
  min-width: 680px;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 0.5rem 0 1rem;
}

.uml-diagram .mermaid svg {
  display: block;
  height: auto !important;
  max-width: none;
  overflow: visible;
}

.uml-legend {
  margin-top: 0.8rem;
  border: 1px solid rgba(20, 34, 43, 0.15);
  border-radius: 10px;
  background: rgba(247, 251, 255, 0.95);
  padding: 0.75rem 0.85rem;
}

.uml-legend h3 {
  font-size: 1.2rem;
  margin-bottom: 0.45rem;
}

.legend-grid {
  display: grid;
  grid-template-columns: minmax(180px, 260px) 1fr;
  gap: 0.3rem 0.8rem;
  align-items: baseline;
}

.legend-grid p {
  margin: 0;
}

.legend-glyph {
  display: inline-block;
  min-width: 5.3ch;
  font-family: "SFMono-Regular", Menlo, Consolas, monospace;
  font-weight: 700;
  color: #113a5a;
}

.legend-detail {
  color: #31424d;
}

.source-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1rem;
  margin: 0.8rem 0 1rem;
  font-size: 0.95rem;
}

.source-browser {
  display: grid;
  gap: 0.8rem;
}

.source-file {
  border: 1px solid rgba(20, 34, 43, 0.15);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.82);
  overflow: hidden;
}

.source-file summary {
  cursor: pointer;
  list-style: none;
  padding: 0.85rem 1rem;
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: #14364a;
  background: rgba(23, 96, 135, 0.08);
}

.source-file summary::-webkit-details-marker {
  display: none;
}

.source-file summary::after {
  content: "+";
  float: right;
  font-size: 1.1rem;
}

.source-file[open] summary::after {
  content: "-";
}

.source-file pre {
  margin: 0;
  border-radius: 0;
  border: none;
}

.source-file-tools {
  padding: 0.7rem 1rem 0;
}

.class-info-trigger {
  border: 1px solid #1a4e73;
  background: linear-gradient(135deg, #205b85, #163f5f);
  color: #ffffff;
  border-radius: 999px;
  padding: 0.42rem 0.82rem;
  font-size: 0.87rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(22, 63, 95, 0.26);
  margin-bottom: 0.75rem;
}

.class-info-trigger:hover {
  background: linear-gradient(135deg, #256b9a, #1b5178);
}

.class-info-dialog {
  border: 1px solid rgba(20, 34, 43, 0.2);
  border-radius: 14px;
  box-shadow: 0 18px 36px rgba(20, 34, 43, 0.22);
  padding: 0;
  width: min(620px, 92vw);
}

.class-info-dialog::backdrop {
  background: rgba(8, 16, 24, 0.45);
}

.class-info-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.9rem 1rem 0.7rem;
  border-bottom: 1px solid rgba(20, 34, 43, 0.12);
  background: #f5f9fc;
}

.class-info-close {
  border: none;
  background: transparent;
  color: #30414d;
  font-size: 1.1rem;
  cursor: pointer;
}

#class-info-body {
  margin: 0;
  padding: 0.95rem 1rem 1rem;
  color: #1f2f39;
  line-height: 1.55;
}

pre {
  margin: 0.6rem 0 0;
  overflow-x: auto;
  padding: 0.9rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(15, 27, 34, 0.92);
  color: #f2f0ec;
}

code {
  font-family: "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 0.86rem;
}

a {
  color: #004d74;
}

.footnote {
  border-top: 1px solid var(--line);
  margin-top: 1.2rem;
  padding: 0.85rem 0 2.3rem;
  color: #253540;
  font-size: 0.92rem;
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  animation: rise 620ms ease forwards;
}

.reveal:nth-of-type(2) {
  animation-delay: 120ms;
}

.reveal:nth-of-type(3) {
  animation-delay: 240ms;
}

.reveal:nth-of-type(4) {
  animation-delay: 360ms;
}

@keyframes rise {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 900px) {
  .person {
    grid-column: span 12;
  }

  .legend-grid {
    grid-template-columns: 1fr;
    gap: 0.15rem;
  }

  .comparison-grid {
    grid-template-columns: 1fr;
  }

  .source-links {
    flex-direction: column;
    gap: 0.35rem;
  }

  .hero {
    padding-top: 3.2rem;
  }

  .panel {
    padding: 1rem;
  }
}