:root {
  color-scheme: dark;
  --bg: #070909;
  --panel: rgba(11, 20, 19, 0.76);
  --panel-strong: rgba(14, 27, 25, 0.92);
  --text: #effff9;
  --muted: #98b4ad;
  --line: rgba(221, 255, 247, 0.14);
  --cyan: #1cf4d2;
  --green: #a9f66b;
  --amber: #ffb84d;
  --red: #ff5c7a;
  --violet: #a987ff;
  --max: 1180px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
}

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

.page-shell {
  position: relative;
  min-height: 100vh;
  isolation: isolate;
}

.van-background {
  position: fixed;
  inset: 0;
  z-index: -2;
  overflow: hidden;
  background:
    linear-gradient(112deg, rgba(28, 244, 210, 0.16), transparent 34%),
    linear-gradient(248deg, rgba(169, 135, 255, 0.14), transparent 38%),
    linear-gradient(180deg, rgba(255, 184, 77, 0.08), transparent 56%),
    linear-gradient(135deg, #060808 0%, #0b1110 48%, #09070d 100%);
}

.grid-field {
  position: absolute;
  inset: -20%;
  opacity: 0.38;
  background-image:
    linear-gradient(rgba(217, 255, 247, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(217, 255, 247, 0.07) 1px, transparent 1px);
  background-size: 56px 56px;
  transform: perspective(900px) rotateX(58deg) translateY(-18%);
  transform-origin: center top;
  animation: grid-drift 18s linear infinite;
}

.van-background::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 9, 9, 0.08), rgba(7, 9, 9, 0.78) 72%, #070909 100%);
}

.mesh-node,
.mesh-beam {
  position: absolute;
  display: block;
}

.mesh-node {
  left: calc(var(--x) * 1%);
  top: calc(var(--y) * 1%);
  width: calc(6px * var(--scale));
  height: calc(6px * var(--scale));
  border-radius: 999px;
  background: var(--node-color);
  box-shadow: 0 0 18px var(--node-color), 0 0 42px rgba(28, 244, 210, 0.22);
  opacity: 0.72;
  animation: node-pulse 4.8s ease-in-out infinite;
  animation-delay: var(--delay);
}

.mesh-beam {
  left: calc(var(--left) * 1%);
  top: calc(var(--top) * 1%);
  width: 42vw;
  height: 1px;
  transform: rotate(var(--rotate));
  background: linear-gradient(90deg, transparent, rgba(28, 244, 210, 0.42), rgba(169, 246, 107, 0.18), transparent);
  animation: beam-slide 8s ease-in-out infinite;
  animation-delay: var(--delay);
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(7, 9, 9, 0.72);
  backdrop-filter: blur(18px);
}

.nav-inner {
  width: min(var(--max), calc(100% - 32px));
  min-height: 70px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand-lockup,
.nav-links,
.action-button,
.status-chip {
  display: inline-flex;
  align-items: center;
}

.brand-lockup {
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  color: var(--cyan);
  border: 1px solid rgba(28, 244, 210, 0.5);
  background: rgba(28, 244, 210, 0.08);
}

.brand-mark svg,
.action-button svg,
.stack-icon svg,
.signal-card svg {
  width: 18px;
  height: 18px;
}

.nav-links {
  gap: 6px;
  color: var(--muted);
  font-size: 14px;
}

.nav-links a {
  padding: 10px 12px;
  border: 1px solid transparent;
}

.nav-links a:hover {
  color: var(--text);
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.04);
}

.hero {
  min-height: calc(100vh - 70px);
  display: grid;
  align-items: center;
  padding: 82px 0 54px;
}

.hero-inner,
.section-inner,
.footer-inner {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
}

.hero-inner {
  max-width: 1060px;
}

.eyebrow,
.section-kicker,
.mode-number {
  color: var(--green);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 20px;
  max-width: 980px;
  font-size: 148px;
  line-height: 0.86;
  letter-spacing: 0;
  text-shadow: 0 0 44px rgba(28, 244, 210, 0.28);
}

.hero-copy {
  max-width: 820px;
  color: #d9fff7;
  font-size: 24px;
  line-height: 1.45;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.action-button {
  gap: 10px;
  min-height: 48px;
  padding: 0 18px;
  border: 1px solid var(--line);
  background: rgba(10, 20, 18, 0.66);
  color: var(--text);
  font-weight: 800;
  backdrop-filter: blur(16px);
}

.action-primary {
  border-color: rgba(28, 244, 210, 0.68);
  background: linear-gradient(135deg, rgba(28, 244, 210, 0.2), rgba(169, 246, 107, 0.14));
  box-shadow: 0 0 34px rgba(28, 244, 210, 0.18);
}

.status-rail {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-top: 58px;
}

.status-chip {
  min-height: 82px;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 4px;
  padding: 14px;
  border: 1px solid rgba(28, 244, 210, 0.24);
  background: rgba(8, 17, 16, 0.72);
  backdrop-filter: blur(18px);
}

.status-chip span,
.status-chip i {
  color: var(--muted);
  font-size: 12px;
  font-style: normal;
}

.status-chip strong {
  font-size: 16px;
}

.status-chip.green {
  border-color: rgba(169, 246, 107, 0.34);
}

.status-chip.violet {
  border-color: rgba(169, 135, 255, 0.34);
}

.status-chip.amber {
  border-color: rgba(255, 184, 77, 0.34);
}

section {
  padding: 86px 0;
}

.section-title {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-heading {
  margin: 10px 0 12px;
  font-size: 64px;
  line-height: 0.98;
  letter-spacing: 0;
}

.section-copy {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.55;
}

.stack-grid,
.modes-grid,
.signals-grid {
  display: grid;
  gap: 14px;
}

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

.stack-card,
.mode-card,
.platform-map,
.loop-step,
.evidence-panel,
.signal-card,
.final-panel {
  border: 1px solid var(--line);
  background: var(--panel);
  backdrop-filter: blur(22px);
}

.stack-card,
.mode-card,
.signal-card {
  min-height: 220px;
  padding: 22px;
  position: relative;
  overflow: hidden;
}

.stack-card::before,
.mode-card::before,
.signal-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--accent);
  box-shadow: 0 0 24px var(--accent);
}

.stack-icon,
.signal-card svg {
  color: var(--accent);
}

.stack-icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  margin-bottom: 22px;
  border: 1px solid color-mix(in srgb, var(--accent), transparent 46%);
  background: color-mix(in srgb, var(--accent), transparent 90%);
}

.stack-card h3,
.mode-card h3,
.loop-step h3,
.signal-card h3 {
  margin-bottom: 10px;
  font-size: 22px;
}

.stack-card p,
.mode-card p,
.loop-step p,
.signal-card p,
.final-panel p {
  color: var(--muted);
  line-height: 1.55;
}

.platform-map {
  padding: 18px;
  background: rgba(7, 12, 12, 0.78);
}

.map-header,
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.map-header {
  padding: 0 0 16px;
  color: var(--muted);
}

.map-header strong {
  color: var(--text);
}

.map-body {
  display: grid;
  grid-template-columns: 1fr 1.1fr 1fr;
  gap: 14px;
}

.map-column {
  display: grid;
  gap: 14px;
}

.map-node {
  min-height: 138px;
  padding: 20px;
  display: grid;
  align-content: center;
  gap: 8px;
  border: 1px solid rgba(217, 255, 247, 0.13);
  background: rgba(255, 255, 255, 0.035);
}

.map-node span {
  color: var(--muted);
  line-height: 1.45;
}

.core-node {
  min-height: 290px;
  text-align: center;
  border-color: rgba(28, 244, 210, 0.44);
  background:
    linear-gradient(135deg, rgba(28, 244, 210, 0.16), transparent 62%),
    rgba(255, 255, 255, 0.04);
  box-shadow: inset 0 0 42px rgba(28, 244, 210, 0.1), 0 0 52px rgba(28, 244, 210, 0.08);
}

.core-node strong {
  display: block;
  margin-bottom: 8px;
  font-size: 30px;
}

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

.mode-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.mode-card ul {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.mode-card li {
  color: #d9fff7;
  font-size: 14px;
}

.mode-card li::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 9px;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
}

.loop {
  display: grid;
  grid-template-columns: 1fr 0.85fr;
  gap: 22px;
  align-items: start;
}

.loop-list {
  display: grid;
  gap: 10px;
}

.loop-step {
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 18px;
  padding: 18px;
}

.loop-step-index {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent), transparent 45%);
  background: color-mix(in srgb, var(--accent), transparent 91%);
  font-weight: 900;
}

.evidence-panel {
  position: sticky;
  top: 96px;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(28, 244, 210, 0.08), rgba(169, 135, 255, 0.1)),
    var(--panel-strong);
}

pre {
  margin: 0;
  padding: 26px;
  overflow: auto;
  color: #d9fff7;
  font-size: 14px;
  line-height: 1.7;
}

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

.signal-card svg {
  margin-bottom: 22px;
}

.final-band {
  padding-top: 46px;
}

.final-panel {
  min-height: 260px;
  padding: 34px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 26px;
  background:
    linear-gradient(120deg, rgba(169, 246, 107, 0.14), transparent 42%),
    linear-gradient(300deg, rgba(28, 244, 210, 0.18), transparent 44%),
    rgba(8, 18, 16, 0.84);
}

.final-panel h2 {
  max-width: 760px;
  margin-bottom: 14px;
  font-size: 64px;
  line-height: 0.96;
}

.final-panel p {
  max-width: 720px;
  font-size: 18px;
}

.footer {
  border-top: 1px solid var(--line);
  padding: 28px 0;
  color: var(--muted);
  background: rgba(7, 9, 9, 0.7);
}

@keyframes grid-drift {
  from { transform: perspective(900px) rotateX(58deg) translateY(-18%); }
  to { transform: perspective(900px) rotateX(58deg) translateY(-10%); }
}

@keyframes node-pulse {
  0%, 100% { transform: scale(1); opacity: 0.45; }
  50% { transform: scale(1.9); opacity: 0.92; }
}

@keyframes beam-slide {
  0%, 100% { opacity: 0.12; transform: translateX(-3vw) rotate(var(--rotate)); }
  50% { opacity: 0.7; transform: translateX(4vw) rotate(var(--rotate)); }
}

@media (max-width: 920px) {
  .nav-inner,
  .map-header,
  .final-panel,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 8px;
  }

  .hero {
    min-height: auto;
    padding-top: 74px;
  }

  .status-rail,
  .stack-grid,
  .modes-grid,
  .signals-grid,
  .map-body,
  .loop {
    grid-template-columns: 1fr;
  }

  .core-node {
    min-height: 190px;
  }

  .evidence-panel {
    position: relative;
    top: auto;
  }

  h1 {
    font-size: 104px;
  }

  .section-heading,
  .final-panel h2 {
    font-size: 48px;
  }

  .hero-copy {
    font-size: 20px;
  }
}

@media (max-width: 560px) {
  .hero-inner,
  .section-inner,
  .footer-inner,
  .nav-inner {
    width: min(100% - 22px, var(--max));
  }

  h1 {
    font-size: 64px;
  }

  .hero-copy,
  .section-copy,
  .final-panel p {
    font-size: 16px;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .action-button {
    justify-content: center;
    width: 100%;
  }

  section {
    padding: 64px 0;
  }

  .stack-card,
  .mode-card,
  .signal-card,
  .final-panel {
    padding: 18px;
  }

  pre {
    font-size: 12px;
    padding: 18px;
  }
}

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

  .grid-field,
  .mesh-node,
  .mesh-beam {
    animation: none;
  }
}