:root {
  --bg: #0b1220;
  --card: rgba(255, 255, 255, 0.06);
  --card-border: rgba(255, 255, 255, 0.12);
  --text: rgba(255, 255, 255, 0.92);
  --muted: rgba(255, 255, 255, 0.72);
  --accent: #f7b500;
  --accent-2: #ff6a3d;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial,
    "Apple Color Emoji", "Segoe UI Emoji";
  background: radial-gradient(900px 600px at 15% 10%, rgba(255, 106, 61, 0.14), transparent 55%),
    radial-gradient(900px 600px at 85% 30%, rgba(247, 181, 0, 0.14), transparent 55%),
    radial-gradient(900px 600px at 70% 95%, rgba(99, 102, 241, 0.12), transparent 60%),
    var(--bg);
}

a {
  color: rgba(255, 255, 255, 0.92);
  text-decoration: underline;
  text-decoration-color: rgba(247, 181, 0, 0.6);
  text-underline-offset: 3px;
}

a:hover {
  text-decoration-color: rgba(255, 106, 61, 0.8);
}

.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 18px;
}

.site-header {
  position: sticky;
  top: 0;
  backdrop-filter: blur(14px);
  background: linear-gradient(
    to bottom,
    rgba(11, 18, 32, 0.9),
    rgba(11, 18, 32, 0.65)
  );
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  z-index: 10;
}

.brand {
  padding: 18px 0;
}

.brand__title {
  font-weight: 800;
  letter-spacing: 0.2px;
  font-size: 18px;
}

.brand__subtitle {
  margin-top: 2px;
  color: var(--muted);
  font-size: 13px;
}

.card {
  margin: 22px 0 26px;
  padding: 22px;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

h2,
h3 {
  margin: 22px 0 10px;
  line-height: 1.25;
}

h2 {
  font-size: 18px;
  letter-spacing: 0.2px;
}

h3 {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.86);
}

p {
  margin: 10px 0;
}

ul {
  margin: 10px 0 10px 18px;
  padding: 0;
}

li {
  margin: 8px 0;
}

.muted {
  color: var(--muted);
}

.code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 0.95em;
  padding: 0.1em 0.35em;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.site-footer {
  padding: 16px 0 28px;
}

.site-footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 14px;
}

@media (max-width: 520px) {
  .card {
    padding: 16px;
  }
}