:root {
  color-scheme: dark;
  --bg: #090d12;
  --panel: #111821;
  --text: #edf2f7;
  --muted: #9aa7b5;
  --line: rgba(148, 163, 184, 0.24);
  --ink: #f8fafc;
  --steel: #7dd3fc;
  --amber: #f0b35a;
  --copper: #c47a5c;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.34);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100%;
  margin: 0;
  background:
    radial-gradient(circle at 76% 18%, rgba(125, 211, 252, 0.16), transparent 30%),
    radial-gradient(circle at 12% 78%, rgba(196, 122, 92, 0.16), transparent 28%),
    linear-gradient(rgba(148, 163, 184, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.06) 1px, transparent 1px),
    var(--bg);
  background-size: auto, auto, 48px 48px, 48px 48px, auto;
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  background:
    linear-gradient(115deg, transparent 0 20%, rgba(125, 211, 252, 0.18) 20.15%, transparent 20.4% 56%, rgba(240, 179, 90, 0.16) 56.15%, transparent 56.4%),
    linear-gradient(25deg, transparent 0 44%, rgba(148, 163, 184, 0.11) 44.15%, transparent 44.4%);
  mask-image: linear-gradient(90deg, transparent, black 12%, black 82%, transparent);
  pointer-events: none;
}

a {
  color: inherit;
}

.shell {
  width: min(100% - 32px, 1040px);
  margin: 0 auto;
  padding: 48px 0;
}

.intro {
  min-height: calc(100svh - 96px);
  display: grid;
  align-content: center;
  gap: 28px;
  padding: 24px 0 12vh;
}

.identity {
  display: flex;
  align-items: center;
  gap: 14px;
}

.kicker,
.section-label {
  margin: 0;
  color: var(--steel);
  font-size: 0.83rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  max-width: 10ch;
  color: var(--ink);
  font-size: clamp(4.1rem, 14vw, 9.5rem);
  line-height: 0.9;
  letter-spacing: 0;
}

.lede {
  max-width: 660px;
  color: var(--muted);
  font-size: clamp(1.25rem, 2.4vw, 1.65rem);
  line-height: 1.45;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 8px;
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 18px;
  background: rgba(17, 24, 33, 0.74);
  font-size: 0.98rem;
  font-weight: 700;
  text-decoration: none;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background 180ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(125, 211, 252, 0.56);
  outline: none;
}

.primary {
  border-color: rgba(125, 211, 252, 0.58);
  background: #d8f3ff;
  color: #0b1220;
}

.secondary {
  background: rgba(17, 24, 33, 0.72);
}

.playground {
  position: relative;
  display: grid;
  gap: 16px;
  max-width: 720px;
  margin: 0 0 80px auto;
  border-top: 1px solid var(--line);
  padding: 36px 0 0;
}

.playground::before,
.playground::after {
  position: absolute;
  top: -5px;
  width: 9px;
  height: 9px;
  border: 1px solid rgba(125, 211, 252, 0.72);
  border-radius: 50%;
  background: var(--bg);
  content: "";
}

.playground::before {
  left: 0;
}

.playground::after {
  right: 0;
  border-color: rgba(240, 179, 90, 0.72);
}

.playground h2 {
  color: var(--ink);
  font-size: clamp(2rem, 5vw, 4.25rem);
  line-height: 1;
  letter-spacing: 0;
}

.playground p:not(.section-label) {
  color: var(--muted);
  font-size: 1.1rem;
  line-height: 1.65;
}

@media (max-width: 640px) {
  .shell {
    width: min(100% - 24px, 1040px);
    padding: 24px 0;
  }

  .intro {
    min-height: calc(100svh - 48px);
    gap: 22px;
    padding-bottom: 10vh;
  }

  .actions,
  .button {
    width: 100%;
  }
}