:root {
  --bg: #0d1117;
  --bg-subtle: #161b22;
  --bg-inset: #010409;
  --border: #30363d;
  --fg: #e6edf3;
  --fg-muted: #8d96a0;
  --accent: #2f81f7;
  --success: #3fb950;
  --gold: #e3b341;
  color-scheme: dark;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); line-height: 1.6; }
.wrap { max-width: 880px; margin: 0 auto; padding: 0 24px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.9em; background: var(--bg-inset); border: 1px solid var(--border); border-radius: 4px; padding: 1px 6px; }
pre { background: var(--bg-inset); border: 1px solid var(--border); border-radius: 8px; padding: 16px; overflow: auto; }
pre code { background: none; border: none; padding: 0; }
.muted { color: var(--fg-muted); }

.banner { display: block; line-height: 0; border-bottom: 1px solid var(--border); }
.banner img { display: block; width: 100%; height: auto; }

.hero {
  text-align: center;
  padding: 56px 0 64px;
  background: radial-gradient(ellipse at top, rgba(47, 129, 247, 0.12), transparent 70%);
  border-bottom: 1px solid var(--border);
}
.logo-mark { width: 88px; height: 88px; border-radius: 20px; margin-bottom: 16px; box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4); }
.logo { font-size: 18px; color: var(--gold); letter-spacing: 0.05em; margin-bottom: 12px; }
.hero h1 { font-size: 48px; margin: 0 0 16px; letter-spacing: -0.02em; }
.tagline { font-size: 19px; color: var(--fg-muted); max-width: 620px; margin: 0 auto 28px; }
.cta { display: flex; gap: 12px; justify-content: center; margin-bottom: 20px; }
.btn {
  display: inline-block; padding: 10px 22px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--bg-subtle); color: var(--fg); font-weight: 600; font-size: 15px;
}
.btn:hover { border-color: var(--fg-muted); text-decoration: none; }
.btn.primary { background: #238636; border-color: #2ea043; color: #fff; }
.btn.primary:hover { background: #2ea043; }
.platforms { font-size: 13px; color: var(--fg-muted); }

main section { padding: 40px 0; border-bottom: 1px solid var(--border); }
main section:last-child { border-bottom: none; }
h2 { font-size: 26px; margin: 0 0 16px; }
h3 { font-size: 17px; margin: 20px 0 8px; }

.flow { padding-left: 20px; }
.flow li { margin-bottom: 10px; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; }
.card { background: var(--bg-subtle); border: 1px solid var(--border); border-radius: 10px; padding: 16px; }
.card h3 { margin: 0 0 6px; color: var(--accent); }
.card p { margin: 0; color: var(--fg-muted); font-size: 14px; }

.features { list-style: none; padding: 0; }
.features li { padding: 8px 0 8px 28px; position: relative; }
.features li::before { content: "✓"; position: absolute; left: 0; color: var(--success); font-weight: 700; }

footer { padding: 32px 0; text-align: center; }
footer p { margin: 6px 0; }

@media (max-width: 600px) {
  .hero h1 { font-size: 36px; }
  .cta { flex-direction: column; align-items: center; }
}

/* OS tabs in the installation section. */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin: 8px 0 20px; }
.tab {
  background: none; border: none; border-bottom: 2px solid transparent;
  color: var(--fg-muted); padding: 8px 16px; cursor: pointer; font-size: 15px; font-weight: 600;
  border-radius: 0;
}
.tab:hover { color: var(--fg); }
.tab.active { color: var(--fg); border-bottom-color: var(--accent); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }