:root {
  --bg: #071017;
  --bg-deep: #04080d;
  --panel: rgba(11, 17, 24, 0.72);
  --panel-strong: rgba(13, 20, 28, 0.88);
  --panel-soft: rgba(20, 29, 39, 0.54);
  --line: rgba(207, 218, 227, 0.12);
  --line-strong: rgba(207, 218, 227, 0.22);
  --ink: #eff3f6;
  --muted: #a9b6c1;
  --muted-strong: #cbd4db;
  --display: "Avenir Next Condensed", "Franklin Gothic Medium", "Arial Narrow", sans-serif;
  --body: "Avenir Next", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", Consolas, monospace;
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.32);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --page-accent: #d26a3f;
  --page-accent-2: #4d8ea0;
  --page-wash: rgba(210, 106, 63, 0.18);
}

body[data-page="instnct"] {
  --page-accent: #5d90c8;
  --page-accent-2: #d26a3f;
  --page-wash: rgba(93, 144, 200, 0.18);
}

body[data-page="research"] {
  --page-accent: #d28b44;
  --page-accent-2: #5a8f96;
  --page-wash: rgba(210, 139, 68, 0.16);
}

body[data-page="rust"] {
  --page-accent: #4f98a8;
  --page-accent-2: #d26a3f;
  --page-wash: rgba(79, 152, 168, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 14% 10%, var(--page-wash), transparent 26%),
    radial-gradient(circle at 86% 14%, rgba(77, 142, 160, 0.12), transparent 22%),
    linear-gradient(160deg, #05090f 0%, #0a141c 34%, #0e1923 68%, #060a0f 100%);
  font-family: var(--body);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.22), transparent 42%);
  opacity: 0.28;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

code {
  padding: 0.08rem 0.34rem;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.07);
  font-family: var(--mono);
  font-size: 0.92em;
}

.site-shell {
  width: min(1340px, calc(100vw - 28px));
  margin: 18px auto 42px;
}

.site-header {
  position: sticky;
  top: 12px;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(6, 10, 15, 0.78);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.brand-mark {
  width: 14px;
  height: 14px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--page-accent), var(--page-accent-2));
  box-shadow: 0 0 0 8px rgba(255, 255, 255, 0.04);
  flex: none;
}

.brand-copy {
  min-width: 0;
}

.eyebrow {
  font: 700 11px/1 var(--mono);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--page-accent);
}

.brand-title {
  display: inline-block;
  margin-top: 3px;
  font-family: var(--display);
  font-size: clamp(1.45rem, 2.2vw, 2rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
  color: var(--ink);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  justify-content: flex-end;
}

.site-nav a {
  position: relative;
  padding: 8px 0;
  font: 700 0.82rem/1 var(--mono);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  background: linear-gradient(90deg, var(--page-accent), var(--page-accent-2));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 140ms ease;
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--ink);
}

.site-nav a:hover::after,
.site-nav a.is-active::after {
  transform: scaleX(1);
}

main {
  display: grid;
  gap: 34px;
  padding-top: 30px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.82fr);
  gap: 22px;
  align-items: stretch;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: clamp(24px, 4vw, 42px);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at 0% 0%, rgba(255, 255, 255, 0.05), transparent 34%),
    linear-gradient(180deg, rgba(11, 17, 24, 0.84), rgba(9, 14, 21, 0.9));
  box-shadow: var(--shadow);
}

.hero-title {
  margin: 0;
  max-width: 11ch;
  font-family: var(--display);
  font-size: clamp(3.6rem, 8vw, 7.4rem);
  line-height: 0.84;
  letter-spacing: -0.06em;
}

.hero-title.compact {
  max-width: 10ch;
  font-size: clamp(3.1rem, 7vw, 6rem);
}

.hero-lede {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(1.04rem, 1.7vw, 1.2rem);
  line-height: 1.74;
  color: var(--muted-strong);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

.button-link,
.button-link-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 999px;
  font: 700 0.84rem/1 var(--mono);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.button-link {
  background: linear-gradient(135deg, var(--page-accent), var(--page-accent-2));
  color: #081018;
}

.button-link-ghost {
  border: 1px solid var(--line-strong);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.04);
}

.thesis-band,
.hero-visual,
.section-band,
.pull-quote,
.route-card,
.signal-card,
.rail-item,
.cta-band,
.feature-block,
.table-shell,
.focus-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--panel);
}

.thesis-band {
  padding: 18px 20px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01)),
    linear-gradient(120deg, rgba(210, 106, 63, 0.08), rgba(77, 142, 160, 0.06));
}

.thesis-label,
.section-label,
.route-kicker,
.signal-label,
.rail-kicker,
.mini-label {
  margin: 0 0 10px;
  font: 700 0.74rem/1.2 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--page-accent);
}

.thesis-band p {
  margin: 0;
  font-size: 1.08rem;
  line-height: 1.75;
  color: var(--ink);
}

.hero-visual {
  position: relative;
  overflow: hidden;
  min-height: 100%;
  background:
    radial-gradient(circle at 84% 12%, rgba(255, 255, 255, 0.14), transparent 18%),
    linear-gradient(160deg, rgba(10, 18, 26, 0.96), rgba(8, 12, 18, 0.92));
  box-shadow: var(--shadow);
}

.hero-visual::before {
  content: "";
  position: absolute;
  inset: -14% -8% auto auto;
  width: 420px;
  height: 420px;
  background: url("./hero-instnct-field.svg") center/contain no-repeat;
  opacity: 0.18;
  transform: rotate(8deg);
}

.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.94;
}

.hero-note,
.hero-stack {
  position: absolute;
  left: 22px;
  right: 22px;
  bottom: 22px;
  display: grid;
  gap: 12px;
}

.hero-note,
.stack-card {
  padding: 18px;
  border-radius: var(--radius-md);
  background: rgba(7, 12, 17, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
}

.hero-note p,
.stack-card p {
  margin: 0;
  line-height: 1.65;
  color: var(--muted-strong);
}

.stack-card strong {
  display: block;
  margin-bottom: 6px;
  font: 700 0.76rem/1.2 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--page-accent);
}

.signal-grid,
.route-grid,
.feature-grid,
.focus-grid {
  display: grid;
  gap: 16px;
}

.signal-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.signal-card {
  padding: 18px 18px 20px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01));
}

.signal-value {
  margin: 0 0 10px;
  font-family: var(--display);
  font-size: clamp(1.35rem, 2vw, 2rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
}

.signal-card p {
  margin: 0;
  line-height: 1.62;
  color: var(--muted);
}

.section-block {
  display: grid;
  gap: 16px;
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(220px, 0.62fr);
  gap: 18px;
  align-items: end;
}

.section-title {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 0.92;
  letter-spacing: -0.045em;
}

.section-intro {
  margin: 0;
  line-height: 1.7;
  color: var(--muted);
}

.section-band {
  padding: clamp(18px, 3vw, 28px);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0.015)),
    linear-gradient(135deg, rgba(12, 19, 28, 0.9), rgba(10, 16, 23, 0.82));
}

.editorial-split {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.82fr);
  gap: 20px;
}

.body-copy {
  display: grid;
  gap: 14px;
}

.body-copy p,
.body-copy li,
.route-card p,
.feature-block p,
.focus-panel p,
.cta-band p {
  margin: 0;
  line-height: 1.72;
  color: var(--muted-strong);
}

.body-copy ul,
.feature-block ul,
.focus-panel ul {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 10px;
}

.pull-quote {
  padding: 22px;
  border-left: 4px solid var(--page-accent-2);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01)),
    rgba(77, 142, 160, 0.08);
}

.pull-quote blockquote {
  margin: 0 0 12px;
  font-size: 1.12rem;
  line-height: 1.75;
}

.route-grid {
  grid-template-columns: minmax(0, 1.25fr) repeat(3, minmax(0, 1fr));
}

.route-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 22px;
  min-height: 100%;
}

.route-card--primary {
  background:
    linear-gradient(135deg, rgba(210, 106, 63, 0.12), rgba(77, 142, 160, 0.1)),
    rgba(11, 17, 24, 0.86);
}

.route-card h3,
.feature-block h3,
.focus-panel h3,
.cta-band h3 {
  margin: 0;
  font-size: 1.2rem;
  line-height: 1.28;
}

.route-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: auto;
  font: 700 0.82rem/1.2 var(--mono);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink);
}

.comparison-shell {
  display: grid;
  gap: 18px;
}

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.comparison-card,
.feature-block,
.focus-panel {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0.015));
}

.diagram {
  margin: 0;
  padding: 16px 18px;
  overflow-x: auto;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  font: 0.9rem/1.75 var(--mono);
  color: var(--muted-strong);
}

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

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 620px;
}

th,
td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
  line-height: 1.65;
}

th {
  font: 700 0.76rem/1.2 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.rail {
  display: grid;
  gap: 14px;
}

.rail-item {
  padding: 18px 20px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.015));
}

.rail-item p {
  margin: 0;
  line-height: 1.68;
  color: var(--muted-strong);
}

.feature-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.focus-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.focus-panel strong {
  display: block;
  margin-bottom: 8px;
  font: 700 0.74rem/1.2 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--page-accent);
}

.cta-band {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(260px, 0.8fr);
  gap: 20px;
  padding: clamp(20px, 4vw, 30px);
  background:
    linear-gradient(135deg, rgba(210, 106, 63, 0.14), rgba(77, 142, 160, 0.1)),
    rgba(11, 17, 24, 0.88);
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-start;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  margin-top: 34px;
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
}

.footer-copy {
  max-width: 62ch;
  color: var(--muted);
  line-height: 1.7;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 12px 16px;
  font: 700 0.8rem/1 var(--mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted-strong);
}

.footer-links a:hover,
.route-link:hover,
.button-link:hover,
.button-link-ghost:hover {
  opacity: 0.9;
}

@media (max-width: 1120px) {
  .signal-grid,
  .focus-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .route-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 920px) {
  .site-header,
  .site-footer,
  .hero,
  .editorial-split,
  .section-head,
  .cta-band,
  .comparison-grid,
  .feature-grid {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: flex-start;
  }

  .site-header,
  .site-footer {
    border-radius: 28px;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .hero-note,
  .hero-stack {
    position: static;
    padding: 18px;
  }

  .hero-visual {
    min-height: 360px;
  }
}

@media (max-width: 700px) {
  .site-shell {
    width: min(100vw - 12px, 100%);
    margin: 10px auto 28px;
  }

  .site-header {
    position: static;
    border-radius: 24px;
    padding: 14px 16px;
  }

  main {
    gap: 22px;
    padding-top: 20px;
  }

  .hero-copy,
  .route-card,
  .comparison-card,
  .feature-block,
  .focus-panel,
  .rail-item,
  .section-band,
  .cta-band,
  .pull-quote {
    padding: 18px;
  }

  .signal-grid,
  .route-grid,
  .focus-grid {
    grid-template-columns: 1fr;
  }

  .site-nav {
    gap: 10px 14px;
  }

  .site-nav a {
    padding: 5px 0;
  }

  table {
    min-width: 560px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}