:root {
  --bg: #071018;
  --bg-elevated: rgba(15, 24, 35, 0.88);
  --bg-panel: rgba(12, 19, 29, 0.92);
  --surface: rgba(18, 28, 40, 0.88);
  --surface-strong: rgba(24, 36, 52, 0.96);
  --surface-soft: rgba(11, 18, 27, 0.7);
  --border: rgba(127, 164, 196, 0.16);
  --border-strong: rgba(127, 164, 196, 0.28);
  --text: #e8eff7;
  --text-muted: #9aa9ba;
  --text-soft: #718196;
  --accent: #78d8e8;
  --accent-strong: #9ee7f1;
  --accent-soft: rgba(120, 216, 232, 0.16);
  --gold: #d8bf83;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.34);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --container: 1180px;
  --nav-height: 78px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Plus Jakarta Sans", system-ui, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(120, 216, 232, 0.12), transparent 34%),
    radial-gradient(circle at top right, rgba(216, 191, 131, 0.08), transparent 28%),
    linear-gradient(180deg, #091018 0%, #071018 35%, #060d14 100%);
  color: var(--text);
  line-height: 1.6;
}

body.nav-open {
  overflow: hidden;
}

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

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

button,
a,
input,
textarea,
select {
  font: inherit;
}

code,
.mono {
  font-family: "IBM Plex Mono", Consolas, monospace;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  padding: 0.75rem 1rem;
  border-radius: 999px;
  background: #ffffff;
  color: #071018;
  z-index: 100;
}

.skip-link:focus {
  top: 1rem;
}

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

.section {
  padding: 5.5rem 0;
}

.section-tight {
  padding-top: 2rem;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 2.5rem;
}

.section-heading h2 {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.section-heading p {
  margin: 0;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.eyebrow {
  margin: 0 0 0.9rem;
  color: var(--accent-strong);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.74rem;
  font-weight: 700;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(22px);
  background: rgba(5, 10, 16, 0.78);
  border-bottom: 1px solid rgba(127, 164, 196, 0.08);
}

.site-header.is-scrolled {
  background: rgba(5, 10, 16, 0.9);
  border-bottom-color: rgba(127, 164, 196, 0.14);
}

.nav-shell {
  min-height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
}

.brand-mark {
  width: 2.3rem;
  height: 2.3rem;
  border-radius: 0.8rem;
  border: 1px solid rgba(120, 216, 232, 0.4);
  background:
    linear-gradient(135deg, rgba(120, 216, 232, 0.2), rgba(216, 191, 131, 0.18)),
    linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.brand-text strong {
  font-size: 0.96rem;
  letter-spacing: 0.01em;
}

.brand-text span:last-child {
  font-size: 0.78rem;
  color: var(--text-soft);
}

.site-nav {
  display: flex;
  align-items: center;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  padding: 0.65rem 0.9rem;
  border-radius: 999px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.1rem;
}

.nav-menu a {
  color: var(--text-muted);
  font-size: 0.95rem;
  padding: 0.25rem 0;
  position: relative;
}

.nav-menu a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.3rem;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 180ms ease;
}

.nav-menu a:hover,
.nav-menu a:focus-visible,
.nav-menu a.is-active {
  color: var(--text);
}

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

.hero {
  padding-top: 4.5rem;
  padding-bottom: 4.5rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: 2rem;
  align-items: stretch;
}

.hero-copy h1 {
  margin: 0;
  font-size: clamp(3.1rem, 8vw, 6rem);
  line-height: 0.94;
  letter-spacing: -0.055em;
}

.hero-subtitle {
  margin: 1rem 0 0;
  font-size: clamp(1.15rem, 2vw, 1.55rem);
  color: #d5e5f3;
  font-weight: 600;
  max-width: 48rem;
}

.hero-thesis {
  margin: 1.3rem 0 0;
  max-width: 48rem;
  color: var(--text-muted);
  font-size: 1.08rem;
}

.meta-grid {
  margin: 2rem 0 0;
  padding: 1.2rem;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(18, 28, 40, 0.75), rgba(10, 17, 25, 0.88));
}

.meta-grid div {
  padding: 0.2rem 0.2rem;
}

.meta-grid dt {
  margin-bottom: 0.35rem;
  color: var(--text-soft);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.13em;
}

.meta-grid dd {
  margin: 0;
  color: var(--text);
  font-weight: 600;
  font-size: 0.97rem;
}

.hero-actions,
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 1.8rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.82rem 1.15rem;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: rgba(255, 255, 255, 0.02);
  color: var(--text);
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(120, 216, 232, 0.4);
  background: rgba(120, 216, 232, 0.08);
}

.button-primary {
  background: linear-gradient(180deg, rgba(120, 216, 232, 0.22), rgba(120, 216, 232, 0.12));
  border-color: rgba(120, 216, 232, 0.42);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.hero-panel,
.panel-surface,
.card,
.runtime-card,
.signal-card,
.principle-card,
.comparison-card,
.resource-card,
.status-panel,
.contact-panel,
.image-frame,
.timeline-item {
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(17, 28, 41, 0.92), rgba(8, 14, 22, 0.94));
  box-shadow: var(--shadow);
}

.hero-panel,
.status-panel,
.contact-panel,
.image-frame {
  border-radius: var(--radius-xl);
}

.panel-surface {
  height: 100%;
  border-radius: inherit;
  padding: 1.25rem;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0)),
    linear-gradient(180deg, rgba(17, 28, 41, 0.9), rgba(8, 14, 22, 0.94));
}

.terminal-header {
  display: flex;
  gap: 0.45rem;
  margin-bottom: 1rem;
}

.terminal-header span {
  width: 0.72rem;
  height: 0.72rem;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
}

.terminal-body {
  min-height: 100%;
}

.muted {
  margin: 0 0 1rem;
  color: var(--gold);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.signal-list {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--text-muted);
}

.signal-list li + li {
  margin-top: 0.55rem;
}

.hero-diagram {
  margin-top: 1.5rem;
  padding-top: 1.2rem;
  border-top: 1px solid rgba(127, 164, 196, 0.12);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
}

.hero-diagram span {
  display: block;
  padding: 0.7rem 0.65rem;
  border-radius: 999px;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text);
  background: rgba(120, 216, 232, 0.08);
  border: 1px solid rgba(120, 216, 232, 0.15);
}

.card-grid,
.principles-grid,
.comparison-grid,
.resource-grid {
  display: grid;
  gap: 1rem;
}

.problem-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 1.5rem;
}

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

.subsystem-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin-top: 1.5rem;
}

.card,
.signal-card,
.principle-card,
.comparison-card,
.resource-card {
  padding: 1.4rem;
  border-radius: var(--radius-lg);
}

.card h3,
.runtime-card h3,
.signal-card h3,
.principle-card h3,
.comparison-card h3,
.resource-card h3,
.timeline-item h3 {
  margin: 0 0 0.65rem;
  font-size: 1.06rem;
  letter-spacing: -0.02em;
}

.card p,
.runtime-card p,
.signal-card p,
.principle-card p,
.comparison-card p,
.resource-card p,
.timeline-item p,
.status-grid p,
.contact-panel p {
  margin: 0;
  color: var(--text-muted);
}

.image-frame {
  padding: 1rem;
}

.image-shell {
  border-radius: calc(var(--radius-xl) - 8px);
  overflow: hidden;
  min-height: 360px;
  border: 1px solid rgba(127, 164, 196, 0.12);
  background:
    radial-gradient(circle at 20% 20%, rgba(120, 216, 232, 0.12), transparent 30%),
    linear-gradient(180deg, rgba(9, 16, 24, 0.88), rgba(7, 12, 19, 0.98));
  display: grid;
  place-items: center;
}

.image-shell.compact {
  min-height: 300px;
}

.image-shell img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.score-diagram {
  width: min(100%, 34rem);
  display: grid;
  gap: 1rem;
  padding: 1.5rem;
}

.score-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.score-node {
  padding: 1rem;
  border-radius: 18px;
  border: 1px solid rgba(120, 216, 232, 0.16);
  background:
    linear-gradient(180deg, rgba(120, 216, 232, 0.08), rgba(120, 216, 232, 0.03)),
    rgba(6, 11, 17, 0.72);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.score-node-input,
.score-node-output {
  position: relative;
}

.score-node-input::after,
.score-node-output::before {
  content: "";
  position: absolute;
  left: 50%;
  width: 1px;
  height: 0.95rem;
  background: linear-gradient(180deg, rgba(120, 216, 232, 0.38), rgba(120, 216, 232, 0));
  transform: translateX(-50%);
}

.score-node-input::after {
  bottom: -1rem;
}

.score-node-output::before {
  top: -1rem;
}

.score-label {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--text-soft);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

.score-node strong {
  display: block;
  color: var(--text);
  font-size: 0.98rem;
  line-height: 1.35;
}

.image-placeholder {
  display: grid;
  gap: 0.5rem;
  padding: 2rem;
  text-align: center;
  color: var(--text-muted);
}

.placeholder-label {
  color: var(--text);
  font-weight: 600;
}

.image-frame figcaption {
  margin-top: 1rem;
  color: var(--text-soft);
  font-size: 0.96rem;
}

.runtime-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.importance-panel {
  margin-top: 1.5rem;
  padding: 1.5rem;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 1.2rem;
}

.importance-copy p {
  margin: 0;
  color: var(--text-muted);
  font-size: 1.02rem;
}

.importance-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.importance-list div,
.bridge-panel article {
  padding: 1rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(120, 216, 232, 0.12);
  background: rgba(120, 216, 232, 0.05);
}

.importance-kicker {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--accent-strong);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 700;
}

.bridge-panel {
  margin-top: 1.5rem;
  padding: 1.5rem;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(17, 28, 41, 0.92), rgba(8, 14, 22, 0.94));
  box-shadow: var(--shadow);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.bridge-panel h3,
.bridge-panel p {
  margin: 0;
}

.bridge-panel h3 {
  margin-bottom: 0.55rem;
  font-size: 1.02rem;
  letter-spacing: -0.02em;
}

.bridge-panel p {
  color: var(--text-muted);
}

.runtime-card {
  padding: 1.5rem;
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
}

.runtime-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(120, 216, 232, 0.06), transparent 46%);
  pointer-events: none;
}

.runtime-card-featured {
  border-color: rgba(120, 216, 232, 0.3);
}

.runtime-label,
.status-kicker {
  display: inline-flex;
  margin-bottom: 0.7rem;
  color: var(--accent-strong);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.13em;
  font-weight: 700;
}

.runtime-card ul {
  margin: 1rem 0 0;
  padding-left: 1rem;
  color: var(--text-muted);
}

.runtime-card li + li {
  margin-top: 0.45rem;
}

.scoring-layout {
  display: grid;
  grid-template-columns: minmax(300px, 0.95fr) minmax(0, 1.05fr);
  gap: 1rem;
  align-items: start;
}

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

.principles-grid,
.comparison-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.timeline-item {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 1.2rem;
  padding: 1.25rem 1.3rem;
  border-radius: var(--radius-lg);
  align-items: start;
}

.timeline-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.2rem;
  border-radius: 1rem;
  background: rgba(120, 216, 232, 0.08);
  border: 1px solid rgba(120, 216, 232, 0.18);
  color: var(--accent-strong);
  font-family: "IBM Plex Mono", Consolas, monospace;
  font-size: 1rem;
}

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

.resource-card {
  min-height: 100%;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.resource-card:hover,
.resource-card:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(120, 216, 232, 0.34);
  background: linear-gradient(180deg, rgba(20, 33, 48, 0.96), rgba(10, 17, 25, 0.96));
}

.status-panel,
.contact-panel {
  padding: 1.5rem;
}

.status-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 1.5rem;
  align-items: start;
}

.status-panel h2,
.contact-panel h2 {
  margin: 0.2rem 0 0;
  font-size: clamp(1.9rem, 3vw, 2.7rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.status-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.license-note {
  margin-top: 1rem;
  color: var(--text-soft);
  font-size: 0.92rem;
}

.site-footer {
  padding: 1.4rem 0 2rem;
}

.footer-shell {
  padding-top: 1.25rem;
  border-top: 1px solid rgba(127, 164, 196, 0.12);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.footer-shell p {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.92rem;
}

.reveal {
  opacity: 1;
  transform: none;
}

.js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 500ms ease, transform 500ms ease;
}

.js .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1120px) {
  .feature-grid,
  .resource-grid,
  .problem-grid,
  .subsystem-grid,
  .principles-grid,
  .comparison-grid,
  .status-grid,
  .importance-list,
  .bridge-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-grid,
  .scoring-layout,
  .status-panel,
  .importance-panel,
  .runtime-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 820px) {
  :root {
    --nav-height: 70px;
  }

  .section {
    padding: 4.3rem 0;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 1rem;
    left: 1rem;
    padding: 1rem;
    flex-direction: column;
    align-items: flex-start;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    background: rgba(8, 13, 20, 0.97);
    box-shadow: var(--shadow);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-6px);
    transition: opacity 160ms ease, transform 160ms ease;
  }

  .nav-menu.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .meta-grid,
  .score-grid,
  .signal-grid,
  .feature-grid,
  .resource-grid,
  .problem-grid,
  .subsystem-grid,
  .principles-grid,
  .comparison-grid,
  .status-grid,
  .importance-list,
  .bridge-panel {
    grid-template-columns: 1fr;
  }

  .timeline-item {
    grid-template-columns: 1fr;
  }

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

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

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}