:root {
  color-scheme: dark;
  --bg: #07101c;
  --panel: #101c2c;
  --panel-2: #142438;
  --text: #eef6ff;
  --muted: #aebed0;
  --line: #2a4058;
  --accent: #52c7f4;
  --accent-2: #f2ad4f;
  --max: 880px;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 80% -10%, rgba(82, 199, 244, 0.18), transparent 36rem),
    linear-gradient(180deg, #0a1524 0, var(--bg) 28rem);
  font-family:
    Inter,
    ui-sans-serif,
    -apple-system,
    BlinkMacSystemFont,
    'Segoe UI',
    sans-serif;
  font-size: 17px;
  line-height: 1.65;
}

a {
  color: var(--accent);
}

a:hover,
a:focus-visible {
  color: #a5e7ff;
}

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

header {
  padding: 42px 0 28px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  gap: 12px;
  align-items: center;
  color: var(--text);
  font-size: 1.2rem;
  font-weight: 760;
  letter-spacing: 0.01em;
  text-decoration: none;
}

.frame-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 2px solid var(--accent);
  border-radius: 11px;
  background: linear-gradient(135deg, rgba(82, 199, 244, 0.28), rgba(242, 173, 79, 0.2));
  box-shadow: inset 0 0 0 4px rgba(7, 16, 28, 0.78);
  font-weight: 800;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 22px;
}

nav a {
  color: var(--muted);
  text-underline-offset: 5px;
}

main {
  padding: 54px 0 72px;
}

h1,
h2,
h3 {
  line-height: 1.18;
  text-wrap: balance;
}

h1 {
  max-width: 760px;
  margin: 0 0 14px;
  font-size: clamp(2.15rem, 8vw, 4.35rem);
  letter-spacing: -0.045em;
}

h2 {
  margin-top: 48px;
  padding-top: 8px;
  font-size: clamp(1.45rem, 4vw, 2rem);
  letter-spacing: -0.022em;
}

h3 {
  margin-top: 30px;
  font-size: 1.12rem;
}

.lede {
  max-width: 720px;
  color: var(--muted);
  font-size: 1.15rem;
}

.meta,
.eyebrow {
  color: var(--accent-2);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.card,
.notice {
  margin: 30px 0;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(145deg, rgba(20, 36, 56, 0.96), rgba(12, 25, 41, 0.96));
  box-shadow: 0 22px 70px rgba(0, 0, 0, 0.2);
}

.notice {
  border-left: 4px solid var(--accent-2);
}

ul,
ol {
  padding-left: 1.35rem;
}

li + li {
  margin-top: 0.55rem;
}

strong {
  color: #fff;
}

code {
  padding: 0.12em 0.36em;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  font-size: 0.9em;
}

footer {
  padding: 28px 0 48px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 520px) {
  body {
    font-size: 16px;
  }

  header {
    padding-top: 28px;
  }

  main {
    padding-top: 38px;
  }

  .card,
  .notice {
    padding: 20px;
    border-radius: 14px;
  }
}

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