:root {
  color-scheme: dark;
  --bg: #07111f;
  --bg-soft: #0d1a2e;
  --panel: rgba(10, 18, 31, 0.78);
  --panel-strong: rgba(13, 24, 43, 0.94);
  --text: #f5f7ff;
  --muted: #9fb4d0;
  --line: rgba(185, 219, 255, 0.14);
  --accent: #7ab8ff;
  --accent-strong: #7ef0cf;
  --accent-soft: rgba(122, 184, 255, 0.08);
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.35);
}

@media (prefers-color-scheme: light) {
  :root {
    color-scheme: light;
    --bg: #f6f1e8;
    --bg-soft: #efe6d8;
    --panel: rgba(255, 251, 245, 0.9);
    --panel-strong: rgba(255, 252, 248, 0.97);
    --text: #1e2a3a;
    --muted: #6f7b8d;
    --line: rgba(92, 73, 46, 0.12);
    --accent: #456fd1;
    --accent-strong: #2d7a67;
    --accent-soft: rgba(69, 111, 209, 0.08);
    --shadow: 0 22px 60px rgba(113, 94, 71, 0.12);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 15% 20%, rgba(122, 184, 255, 0.16), transparent 22%),
    radial-gradient(circle at 80% 10%, rgba(126, 240, 207, 0.14), transparent 22%),
    radial-gradient(circle at 70% 75%, rgba(255, 138, 179, 0.1), transparent 24%),
    linear-gradient(180deg, #040a14 0%, #07111f 36%, #0a1424 100%);
  color: var(--text);
  font-family: "Avenir Next", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.65;
}

.shell {
  width: min(900px, calc(100% - 32px));
  margin: 32px auto 48px;
}

.doc {
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: 32px;
  background:
    linear-gradient(135deg, rgba(19, 35, 62, 0.88), rgba(8, 15, 27, 0.92)),
    var(--panel-strong);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.site-home {
  display: inline-flex;
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 50;
  margin-bottom: 0;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(9, 17, 30, 0.78);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.22);
  color: var(--accent);
  font-weight: 700;
  backdrop-filter: blur(14px);
}

.site-home:hover {
  text-decoration: none;
  color: var(--accent-strong);
}

h1,
h2,
h3,
p,
ul,
ol,
pre {
  margin-top: 0;
}

h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
  text-wrap: balance;
}

h2 {
  margin-top: 2rem;
  font-size: 1.4rem;
}

h3 {
  color: var(--text);
}

ul,
ol {
  padding-left: 1.25rem;
}

code {
  padding: 0.14rem 0.38rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--accent-soft);
  font-family: "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 0.92em;
}

pre {
  overflow-x: auto;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(4, 10, 20, 0.65);
}

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

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

.lede {
  color: var(--muted);
  font-size: 1.03rem;
}

ul li,
ol li {
  margin-bottom: 0.45rem;
}

@media (max-width: 720px) {
  .site-home {
    top: 12px;
    right: 12px;
    padding: 9px 12px;
    font-size: 0.95rem;
  }
}