:root {
  --color-primary: #1e3a5f;
  --color-accent: #b45309;
  --color-background: #f8fafc;
  --color-foreground: #0f172a;
  --color-card: #ffffff;
  --color-muted: #e9eef5;
  --color-muted-foreground: #475569;
  --color-border: #cbd5e1;
  --color-ring: #1e3a5f;
  --font-serif: "Crimson Pro", "Iowan Old Style", "Palatino Linotype", serif;
  --font-sans: "Atkinson Hyperlegible", "Helvetica Neue", sans-serif;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
}

* { box-sizing: border-box; }
html { scroll-padding-top: 72px; }
html, body { margin: 0; min-height: 100%; }
body {
  color: var(--color-foreground);
  font: 18px/1.6 var(--font-sans);
  background: var(--color-background);
  -webkit-font-smoothing: antialiased;
}

.top, main, footer {
  width: min(960px, calc(100% - 40px));
  margin: 0 auto;
}

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  border-bottom: 1px solid var(--color-border);
}
.wordmark, nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--color-primary);
  text-decoration: none;
  cursor: pointer;
  transition: color 200ms ease;
}
.wordmark {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
}
nav { display: flex; gap: var(--space-2); }
nav a {
  padding: 0 4px;
  color: var(--color-muted-foreground);
  font-size: 15px;
}
nav .nav-demo {
  color: var(--color-primary);
  font-weight: 700;
  border-bottom: 2px solid var(--color-accent);
}
.wordmark:hover, nav a:hover { color: var(--color-accent); }
.wordmark:focus-visible, nav a:focus-visible, .more a:focus-visible, .action:focus-visible, .primary-action:focus-visible, .idea a:focus-visible, footer a:focus-visible {
  outline: 2px solid var(--color-ring);
  outline-offset: 3px;
}

.running {
  margin: var(--space-8) 0 var(--space-2);
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
h1 {
  margin: 0 0 var(--space-1);
  font-family: var(--font-serif);
  font-size: clamp(36px, 6vw, 52px);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.thesis {
  margin: 0 0 var(--space-3);
  color: var(--color-primary);
  font-family: var(--font-serif);
  font-size: clamp(24px, 4vw, 30px);
  font-weight: 600;
  line-height: 1.2;
}
.abstract {
  max-width: 58ch;
  margin: 0 0 var(--space-4);
  color: var(--color-muted-foreground);
  font-size: 18px;
}

.idea {
  margin: 0 0 var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
}
.idea h2 {
  margin-bottom: var(--space-1);
  font-size: 24px;
}
.idea p { margin-bottom: 0; }
.idea a {
  color: var(--color-primary);
  text-underline-offset: 3px;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin: 0 0 var(--space-3);
}
.split > div {
  padding-top: var(--space-2);
  border-top: 2px solid var(--color-primary);
}
.split > div:last-child { border-color: var(--color-border); }
.split h3 {
  margin: 0 0 var(--space-1);
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
}
.split ul {
  margin: 0;
  padding: 0 0 0 1.15em;
  color: var(--color-muted-foreground);
  font-size: 16px;
}
.split li + li { margin-top: 8px; }

h2 {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 var(--space-2);
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 600;
}
h2 span {
  color: var(--color-accent);
  font-size: 18px;
  font-weight: 600;
}

section { margin: 0 0 var(--space-8); }
section p {
  max-width: 62ch;
  margin: 0 0 var(--space-3);
  color: var(--color-muted-foreground);
}

.graph, .table-wrap {
  margin: 0 0 var(--space-3);
  padding: 20px 18px 14px;
  overflow: auto;
  overscroll-behavior-inline: contain;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-card);
}
.detail-graph:focus-visible {
  outline: 2px solid var(--color-ring);
  outline-offset: 3px;
}
.graph img {
  display: block;
  width: 100%;
  height: auto;
}
.core-graph { margin-bottom: var(--space-8); }
.core-graph img {
  max-width: 640px;
  margin: 0 auto;
}
figcaption {
  margin: 10px 2px 0;
  color: var(--color-muted-foreground);
  font-family: var(--font-serif);
  font-size: 14px;
  font-style: italic;
}

.release { margin-bottom: var(--space-8); }
.release > h2 { margin-bottom: var(--space-3); }
.release-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}
.release article {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-height: 224px;
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-card);
}
.release article.featured {
  border-color: var(--color-accent);
  background: rgb(180 83 9 / 0.03);
}
.release .label {
  margin: 0 0 var(--space-1);
  color: var(--color-accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.release h3 {
  margin: 0 0 var(--space-1);
  font-family: var(--font-serif);
  font-size: 23px;
  font-weight: 600;
  line-height: 1.2;
}
.release article p:not(.label) {
  margin-bottom: var(--space-2);
  font-size: 16px;
}
.action {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: auto;
  color: var(--color-primary);
  font-size: 15px;
  font-weight: 700;
  text-underline-offset: 3px;
}
.action:hover, .idea a:hover { color: var(--color-accent); }
.primary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border: 1px solid var(--color-primary);
  border-radius: 4px;
  color: #ffffff;
  background: var(--color-primary);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 200ms ease, border-color 200ms ease;
}
.primary-action:hover {
  border-color: var(--color-accent);
  color: #ffffff;
  background: var(--color-accent);
}
.hero-demo { margin: 0 0 var(--space-8); }
.action.primary-action {
  min-height: 44px;
  margin-top: auto;
  color: #ffffff;
}

.details-label {
  margin: var(--space-8) 0 var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}
th, td {
  padding: 10px 8px 10px 0;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}
th {
  color: var(--color-primary);
  font-weight: 700;
}
td:first-child { color: var(--color-muted-foreground); width: 24%; }

.more {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin: var(--space-6) 0 var(--space-8);
}
.more a, footer a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
}
.more a:hover, footer a:hover { color: var(--color-accent); }
footer {
  padding: 0 0 var(--space-8);
  color: var(--color-muted-foreground);
  font-size: 14px;
}

@media (max-width: 700px) {
  .top, main, footer { width: calc(100% - 28px); }
  .running { margin-top: var(--space-6); }
  h1 { font-size: 34px; }
  .split { grid-template-columns: 1fr; gap: var(--space-3); }
  .release-grid { grid-template-columns: 1fr; }
  .release article { min-height: 0; }
  .hero-demo { width: 100%; }
  .detail-graph img { min-width: 720px; }
}

@media (prefers-reduced-motion: reduce) {
  .wordmark, nav a, .more a, .action, .primary-action, footer a { transition: none; }
}