:root {
  color-scheme: light dark;
  --bg: #f4f5f9;
  --surface: rgba(255, 255, 255, 0.78);
  --text: #17171b;
  --muted: #686873;
  --line: rgba(60, 60, 67, 0.16);
  --accent: #6750d8;
  --accent-soft: rgba(103, 80, 216, 0.12);
  --shadow: 0 18px 60px rgba(39, 32, 73, 0.12);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101014;
    --surface: rgba(31, 31, 38, 0.8);
    --text: #f5f4f8;
    --muted: #aaa8b2;
    --line: rgba(235, 235, 245, 0.14);
    --accent: #a99af7;
    --accent-soft: rgba(169, 154, 247, 0.14);
    --shadow: 0 18px 60px rgba(0, 0, 0, 0.28);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at 10% 0%, rgba(119, 97, 220, 0.18), transparent 34rem),
    radial-gradient(circle at 95% 20%, rgba(75, 142, 255, 0.12), transparent 32rem),
    var(--bg);
  font-family: ui-rounded, "SF Pro Rounded", "SF Pro Display", -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.shell {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 750;
  letter-spacing: -0.02em;
}

.mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  color: white;
  background: linear-gradient(135deg, #8c70ee, #4657ca);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(89, 69, 191, 0.28);
}

nav {
  display: flex;
  gap: 18px;
  font-size: 14px;
  font-weight: 600;
}

nav a {
  color: var(--muted);
}

main {
  padding: 36px 0 72px;
}

.hero {
  padding: 68px 56px;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(24px);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  max-width: 700px;
  margin: 0;
  font-size: clamp(42px, 7vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.055em;
}

.lead {
  max-width: 650px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 19px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  color: white;
  background: var(--accent);
  border-radius: 12px;
  font-weight: 700;
}

.button.secondary {
  color: var(--text);
  background: var(--accent-soft);
}

.button:hover {
  text-decoration: none;
  filter: brightness(1.05);
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.card,
.document {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  backdrop-filter: blur(18px);
}

.card h2 {
  margin: 0 0 8px;
  font-size: 20px;
  letter-spacing: -0.02em;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.document {
  max-width: 820px;
  margin: 0 auto;
  padding: 42px clamp(24px, 6vw, 62px);
}

.document h1 {
  font-size: clamp(36px, 6vw, 54px);
}

.document h2 {
  margin: 34px 0 8px;
  font-size: 21px;
  letter-spacing: -0.02em;
}

.document p,
.document li {
  color: var(--muted);
}

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

.updated {
  margin: 10px 0 30px;
  color: var(--muted);
  font-size: 14px;
}

.notice {
  margin: 24px 0;
  padding: 16px 18px;
  color: var(--text);
  background: var(--accent-soft);
  border-radius: 14px;
}

footer {
  padding: 28px 0 42px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

@media (max-width: 640px) {
  header {
    align-items: flex-start;
    flex-direction: column;
  }

  main {
    padding-top: 14px;
  }

  .hero {
    padding: 42px 24px;
    border-radius: 22px;
  }

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

  .document {
    border-radius: 18px;
  }
}