:root {
  --bg: #0b1020;
  --surface: #121a30;
  --surface-2: #17223f;
  --line: rgba(255, 255, 255, 0.16);
  --text: #e6ecf9;
  --muted: #a8b7d5;
  --accent: #79a8ff;
  --accent-soft: rgba(121, 168, 255, 0.18);
  --good: #88dfc0;
  --warn: #f5d18b;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 18% 12%, #131f3f 0%, #0a1020 38%, #090d19 100%);
  line-height: 1.58;
}

a {
  color: var(--accent);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.95rem 5vw;
  background: rgba(8, 12, 23, 0.9);
  border-bottom: 1px solid var(--line);
}

.brand {
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.site-header nav {
  display: flex;
  gap: 0.95rem;
  flex-wrap: wrap;
}

.site-header nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.93rem;
}

.site-header nav a:hover {
  color: var(--text);
}

main {
  width: min(1100px, 100% - 3rem);
  margin: 0 auto;
  padding: 2.2rem 0 3.2rem;
}

.hero {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: linear-gradient(160deg, rgba(18, 27, 50, 0.9), rgba(13, 19, 36, 0.92));
  padding: clamp(1.2rem, 3vw, 2rem);
}

.hero-tag {
  margin: 0;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}

h1,
h2,
h3,
h4 {
  font-family: "IBM Plex Serif", Georgia, serif;
  line-height: 1.22;
  margin: 0;
}

h1 {
  margin-top: 0.6rem;
  font-size: clamp(1.9rem, 3.8vw, 3rem);
  max-width: 20ch;
}

.hero-subtitle {
  margin-top: 0.9rem;
  max-width: 76ch;
  color: var(--muted);
}

.exec-summary {
  margin: 1rem 0 0;
  padding-left: 1.15rem;
  color: var(--text);
  max-width: 88ch;
}

.exec-summary li {
  margin-bottom: 0.38rem;
}

.hero-actions {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.62rem;
}

.button {
  display: inline-block;
  text-decoration: none;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--text);
  padding: 0.52rem 1rem;
  font-weight: 600;
  font-size: 0.92rem;
}

.button.primary {
  background: var(--accent);
  border-color: transparent;
  color: #05112f;
}

.hero-figure {
  margin: 1.2rem 0 0;
}

.hero-figure img {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--line);
  display: block;
}

.hero-figure figcaption {
  margin-top: 0.45rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.section {
  margin-top: 2rem;
  padding: 1.3rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(16, 24, 45, 0.8);
}

.section h2 {
  font-size: clamp(1.3rem, 2.6vw, 2rem);
}

.section-intro {
  margin-top: 0.55rem;
  color: var(--muted);
}

.card-grid {
  display: grid;
  gap: 0.85rem;
  margin-top: 0.95rem;
}

.card-grid.four {
  grid-template-columns: repeat(12, minmax(0, 1fr));
}

.card-grid.three {
  grid-template-columns: repeat(12, minmax(0, 1fr));
}

.card-grid.two {
  grid-template-columns: repeat(12, minmax(0, 1fr));
}

.card {
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 12px;
  padding: 0.95rem;
}

.card-grid.four .card,
.card-grid.two .card,
.card-grid.three .card {
  grid-column: span 12;
}

.card h3,
.card h4 {
  font-size: 1.06rem;
}

.card p {
  margin: 0.5rem 0 0;
  color: var(--muted);
}

.card img {
  margin-top: 0.7rem;
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--line);
  display: block;
}

.table-wrap {
  margin-top: 0.8rem;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(8, 13, 24, 0.86);
}

.table-wrap.compact table {
  min-width: 640px;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 920px;
}

th,
td {
  padding: 0.68rem 0.72rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  color: #d4e4ff;
  font-size: 0.93rem;
}

td {
  color: var(--text);
  font-size: 0.92rem;
}

.best {
  background: rgba(136, 223, 192, 0.14);
}

.fastest {
  background: rgba(245, 209, 139, 0.2);
  font-weight: 700;
}

.table-summary,
.small-note {
  margin-top: 0.72rem;
  color: var(--muted);
}

.nees-callout {
  margin-top: 0.9rem;
  padding: 0.95rem;
  border-radius: 10px;
  border: 1px solid rgba(136, 223, 192, 0.42);
  background: linear-gradient(135deg, rgba(136, 223, 192, 0.12), rgba(121, 168, 255, 0.08));
}

.nees-callout h3 {
  font-size: 1.06rem;
}

.formula {
  margin: 0.42rem 0 0;
  font-family: "IBM Plex Serif", Georgia, serif;
  font-size: 1.02rem;
  color: var(--good);
}

.plot-card {
  margin-top: 1rem;
}

.plot-card img {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--line);
  display: block;
}

.plot-card figcaption {
  margin-top: 0.4rem;
  color: var(--muted);
  font-size: 0.89rem;
}

.design-philosophy {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  padding: 0.95rem;
  margin-top: 0.8rem;
}

.design-philosophy p {
  color: var(--muted);
  margin: 0.56rem 0 0;
}

.design-philosophy ol,
.design-philosophy ul {
  margin: 0.5rem 0 0;
  padding-left: 1.1rem;
}

.subsection-title {
  margin-top: 1.05rem;
  font-size: 1.14rem;
}

pre {
  margin: 0.8rem 0 0;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #0a1121;
  padding: 0.8rem;
  overflow-x: auto;
}

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

footer {
  width: min(1100px, 100% - 3rem);
  margin: 0 auto 2.2rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.zoomable-plot {
  cursor: zoom-in;
}

.plot-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: none;
  place-items: center;
  background: rgba(4, 8, 16, 0.9);
  padding: 1rem;
}

.plot-modal.open {
  display: grid;
}

.plot-modal-body {
  width: min(1100px, 100%);
  max-height: 92vh;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #0b1428;
  padding: 0.8rem;
}

#plot-modal-image {
  width: 100%;
  display: block;
  border-radius: 8px;
  border: 1px solid var(--line);
}

.plot-modal-caption {
  margin: 0.5rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.plot-modal-source-wrap {
  margin: 0.45rem 0 0;
}

.plot-modal-source-wrap a {
  color: var(--accent);
}

.plot-modal-close {
  position: fixed;
  top: 12px;
  right: 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #0d1832;
  color: var(--text);
  padding: 0.38rem 0.75rem;
  font-weight: 600;
  cursor: pointer;
}

@media (min-width: 860px) {
  .card-grid.four .card {
    grid-column: span 6;
  }

  .card-grid.three .card {
    grid-column: span 4;
  }

  .card-grid.two .card {
    grid-column: span 6;
  }
}

@media (max-width: 780px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.55rem;
  }

  main,
  footer {
    width: calc(100% - 1.4rem);
  }

  .section {
    padding: 0.9rem;
  }
}