:root {
  --bg0: #0c1118;
  --bg1: #152033;
  --text: #eef2f7;
  --muted: #9aa8bc;
  --accent: #3d8fd1;
  --line: rgba(255, 255, 255, 0.08);
  --font: "Segoe UI", "Helvetica Neue", sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 15% -10%, rgba(61, 143, 209, 0.22), transparent 55%),
    radial-gradient(900px 500px at 90% 10%, rgba(45, 90, 130, 0.18), transparent 50%),
    linear-gradient(165deg, var(--bg0), var(--bg1) 55%, #0a0e14);
}

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

.stage {
  min-height: calc(100vh - 64px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 48px 24px 24px;
  max-width: 720px;
  margin: 0 auto;
}

.brand {
  margin: 0 0 18px;
  font-size: clamp(1.8rem, 5.5vw, 3.2rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1;
}

.brand a { color: inherit; text-decoration: none; }

h1 {
  margin: 0 0 14px;
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  font-weight: 600;
}

.lede {
  margin: 0;
  max-width: 34rem;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.55;
}

.links {
  margin-top: 28px;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.links a {
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  text-decoration: none;
}
.links a:hover {
  border-color: rgba(61, 143, 209, 0.55);
  background: rgba(61, 143, 209, 0.12);
  text-decoration: none;
}

footer {
  padding: 18px 24px 28px;
  text-align: center;
  color: var(--muted);
  font-size: 0.92rem;
}

.doc {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 64px;
}

.doc h1 {
  margin: 8px 0 8px;
  font-size: clamp(1.8rem, 4vw, 2.4rem);
}

.doc .meta {
  margin: 0 0 28px;
  color: var(--muted);
  font-size: 0.92rem;
}

.doc section {
  margin: 0 0 22px;
  padding-top: 4px;
  border-top: 1px solid var(--line);
}

.doc h2 {
  margin: 18px 0 8px;
  font-size: 1.1rem;
}

.doc p, .doc li {
  color: #d5deea;
  line-height: 1.6;
}

.doc ul {
  margin: 8px 0 0;
  padding-left: 1.2rem;
}

.back { margin-top: 36px; }