:root {
  --bg: #070b16;
  --bg-soft: rgba(17, 24, 39, 0.78);
  --card: rgba(12, 18, 33, 0.78);
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.16);
  --text: #f5f7fb;
  --muted: #a7b2c8;
  --muted-2: #8591aa;
  --accent: #d8b27c;
  --accent-strong: #f2cf9f;
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.35);
  --radius: 24px;
  --radius-sm: 18px;
  --max: 1220px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(216, 178, 124, 0.14), transparent 0 28%),
    radial-gradient(circle at top right, rgba(93, 127, 196, 0.14), transparent 0 26%),
    linear-gradient(180deg, #050914 0%, #091120 50%, #060913 100%);
  color: var(--text);
  min-height: 100vh;
}

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

.site-shell {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.55), rgba(0,0,0,0.08));
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  width: min(calc(100% - 32px), var(--max));
  margin: 18px auto 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border: 1px solid var(--line);
  background: rgba(8, 12, 22, 0.72);
  backdrop-filter: blur(18px);
  border-radius: 999px;
  box-shadow: var(--shadow);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

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

.brand small {
  display: block;
  color: var(--muted);
  font-size: 0.76rem;
  margin-top: 2px;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 12px;
  background:
    linear-gradient(135deg, rgba(216,178,124,0.9), rgba(242,207,159,0.34)),
    linear-gradient(135deg, rgba(93,127,196,0.18), rgba(255,255,255,0));
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.18);
  position: relative;
}

.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  left: 8px;
  right: 8px;
  border-radius: 999px;
  background: rgba(7, 11, 22, 0.78);
}

.brand-mark::before { top: 9px; height: 5px; }
.brand-mark::after { bottom: 9px; height: 5px; }

.site-nav {
  display: inline-flex;
  gap: 18px;
  align-items: center;
}

.site-nav a {
  color: var(--muted);
  font-size: 0.92rem;
  transition: color 0.2s ease, opacity 0.2s ease;
}

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

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.03);
  color: var(--text);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
}

.nav-toggle span {
  width: 16px;
  height: 2px;
  border-radius: 999px;
  background: var(--text);
}

main {
  width: min(calc(100% - 32px), var(--max));
  margin: 0 auto;
  padding: 42px 0 96px;
}

.section {
  padding: 50px 0;
}

.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.9fr;
  gap: 28px;
  align-items: stretch;
  padding-top: 54px;
}

.hero-copy,
.hero-panel,
.card {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(14, 20, 36, 0.88), rgba(10, 14, 27, 0.72));
  box-shadow: var(--shadow);
}

.hero-copy {
  padding: 34px;
  border-radius: calc(var(--radius) + 4px);
}

.hero-panel {
  padding: 24px;
  border-radius: calc(var(--radius) + 4px);
}

.eyebrow,
.panel-label,
.surface-tag,
.atlas-step {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(216, 178, 124, 0.26);
  color: var(--accent-strong);
  background: rgba(216, 178, 124, 0.08);
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hero h1,
.section-head h2 {
  margin: 18px 0 16px;
  line-height: 1.02;
  letter-spacing: -0.03em;
}

.hero h1 {
  font-size: clamp(2.35rem, 5vw, 4.9rem);
  max-width: 12ch;
}

.lead {
  font-size: 1.14rem;
  color: var(--text);
  max-width: 64ch;
}

.supporting,
.section-head p,
.card p,
.card li {
  color: var(--muted);
  line-height: 1.68;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(255,255,255,0.22);
}

.button.primary {
  background: linear-gradient(135deg, rgba(216,178,124,0.22), rgba(242,207,159,0.11));
}

.button.secondary {
  background: rgba(255,255,255,0.03);
}

.stack-diagram {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.stack-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  background: rgba(255,255,255,0.02);
}

.stack-item span,
.card h3 {
  display: block;
  margin-bottom: 8px;
  font-size: 1.06rem;
}

.stack-item small,
.surface-one-liner {
  color: var(--muted);
  line-height: 1.55;
}

.section-head {
  max-width: 780px;
  margin-bottom: 24px;
}

.grid {
  display: grid;
  gap: 18px;
}

.grid.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.card {
  padding: 24px;
  border-radius: var(--radius);
}

.atlas-card {
  position: relative;
  overflow: hidden;
}

.atlas-card::after {
  content: "";
  position: absolute;
  inset: auto -30px -30px auto;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(216,178,124,0.16), rgba(216,178,124,0));
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 10px 0 24px;
}

.filter {
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.03);
  color: var(--muted);
  padding: 10px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: border-color 0.18s ease, color 0.18s ease, background 0.18s ease;
}

.filter.active,
.filter:hover,
.filter:focus-visible {
  color: var(--text);
  border-color: rgba(216,178,124,0.32);
  background: rgba(216,178,124,0.08);
}

.surface-card ul {
  margin: 16px 0 0;
  padding-left: 18px;
}

.surface-card li + li { margin-top: 10px; }
.surface-card.is-hidden { display: none; }

.footer {
  width: min(calc(100% - 32px), var(--max));
  margin: 0 auto 42px;
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: rgba(8, 12, 22, 0.8);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
}

.footer p {
  margin: 8px 0 0;
  color: var(--muted);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.footer-links a {
  color: var(--muted);
  font-size: 0.92rem;
}

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

@media (max-width: 760px) {
  .topbar {
    width: min(calc(100% - 20px), var(--max));
    padding: 12px 14px;
    border-radius: 24px;
  }

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

  .site-nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: rgba(8, 12, 22, 0.96);
    box-shadow: var(--shadow);
  }

  .site-nav.open { display: flex; }

  .site-nav a {
    width: 100%;
    padding: 12px 10px;
    border-radius: 12px;
  }

  main {
    width: min(calc(100% - 20px), var(--max));
    padding-top: 26px;
  }

  .hero,
  .grid.four,
  .grid.three,
  .footer {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: stretch;
  }

  .hero-copy,
  .hero-panel,
  .card { padding: 22px; }

  .hero h1 { max-width: 14ch; }
}