style.css

:root {
  color-scheme: dark;
  --bg: #070b10;
  --panel: #0d151d;
  --text: #f2f7f7;
  --muted: #a9b8c1;
  --line: #263849;
  --cyan: #6ef2df;
  --blue: #8db9ff;
  --green: #acf5a6;
  --ink: #061012;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 18% 8%, rgba(110, 242, 223, 0.14), transparent 26rem),
    radial-gradient(circle at 100% 38%, rgba(141, 185, 255, 0.10), transparent 30rem),
    var(--bg);
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  line-height: 1.5;
}

a {
  color: inherit;
}

.shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 42px 0 56px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 440px);
  gap: 44px;
  align-items: center;
  min-height: 500px;
}

.eyebrow,
.section-label {
  margin: 0 0 12px;
  color: var(--cyan);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 780px;
  margin-bottom: 18px;
  font-size: clamp(4.2rem, 11vw, 9.5rem);
  line-height: 0.82;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 12px;
  font-size: clamp(1.6rem, 3vw, 2.35rem);
  line-height: 1.05;
  letter-spacing: 0;
}

.lede {
  max-width: 700px;
  margin-bottom: 14px;
  color: var(--text);
  font-size: clamp(1.35rem, 2.2vw, 2.1rem);
  line-height: 1.14;
}

.sublede,
.section p {
  max-width: 720px;
  color: var(--muted);
  font-size: 1.08rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  font-weight: 750;
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
  border-color: rgba(110, 242, 223, 0.48);
}

.button.primary {
  border-color: transparent;
  background: var(--cyan);
  color: var(--ink);
}

.signal {
  position: relative;
  min-height: 420px;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background:
    linear-gradient(160deg, rgba(110, 242, 223, 0.12), transparent 38%),
    linear-gradient(340deg, rgba(141, 185, 255, 0.12), transparent 40%),
    #0b1219;
}

.signal::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.055) 1px, transparent 1px);
  background-size: 28px 28px;
}

.trace {
  position: absolute;
  left: 11%;
  right: 11%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  opacity: 0.8;
  transform-origin: center;
}

.trace-a {
  top: 42%;
  transform: rotate(18deg);
}

.trace-b {
  top: 51%;
  transform: rotate(-16deg);
  background: linear-gradient(90deg, transparent, var(--blue), transparent);
}

.trace-c {
  top: 61%;
  transform: rotate(0deg);
  background: linear-gradient(90deg, transparent, var(--green), transparent);
}

.core {
  position: absolute;
  left: 50%;
  top: 50%;
  display: grid;
  place-items: center;
  width: 190px;
  height: 190px;
  border: 1px solid rgba(110, 242, 223, 0.42);
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(110, 242, 223, 0.18), rgba(13, 21, 29, 0.92) 64%);
  box-shadow: 0 0 48px rgba(110, 242, 223, 0.20);
  transform: translate(-50%, -50%);
  text-align: center;
}

.core strong {
  display: block;
  font-size: 1.35rem;
}

.core span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 750;
  text-transform: uppercase;
}

.node {
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 28px rgba(110, 242, 223, 0.72);
}

.n1 { left: 16%; top: 33%; }
.n2 { right: 18%; top: 30%; background: var(--blue); }
.n3 { left: 20%; bottom: 24%; background: var(--green); }
.n4 { right: 17%; bottom: 25%; }

.metrics-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 32px;
}

.metrics-strip article {
  min-height: 124px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(13, 21, 29, 0.78);
}

.metrics-strip strong {
  display: block;
  margin-bottom: 8px;
  color: var(--green);
  font-size: clamp(1.45rem, 2.4vw, 2.1rem);
  line-height: 1;
  white-space: nowrap;
}

.metrics-strip span {
  color: var(--muted);
}

.section {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(320px, 1fr);
  gap: 28px;
  padding: 32px 0;
  border-top: 1px solid var(--line);
}

.section.compact {
  grid-template-columns: minmax(0, 0.7fr) minmax(300px, 1fr);
}

.artifact-card {
  display: block;
  min-height: 180px;
  padding: 22px;
  border: 1px solid rgba(110, 242, 223, 0.32);
  border-radius: 8px;
  background: linear-gradient(145deg, rgba(110, 242, 223, 0.12), rgba(13, 21, 29, 0.92));
  text-decoration: none;
}

.artifact-card span,
.principles {
  color: var(--muted);
}

.artifact-card strong {
  display: block;
  margin: 12px 0 18px;
  color: var(--text);
  font-size: clamp(1.35rem, 2.6vw, 2rem);
  line-height: 1.05;
}

.artifact-card small {
  color: var(--muted);
  font-size: 0.98rem;
}

.principles {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 20px;
}

@media (max-width: 820px) {
  .shell {
    width: min(100% - 24px, 720px);
    padding: 30px 0;
  }

  .hero,
  .section,
  .section.compact {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .signal {
    min-height: 260px;
  }

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

@media (max-width: 520px) {
  .actions,
  .metrics-strip {
    display: grid;
    grid-template-columns: 1fr;
  }

  .button {
    width: 100%;
  }
}