:root {
  color-scheme: dark;
  --bg: #0a0a0a;
  --fg: #fafafa;
  --muted: #a1a1a1;
  --border: #2a2a2a;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
}
.hero { max-width: 560px; }
.mark { margin-bottom: 20px; }
h1 { font-size: 2.5rem; font-weight: 650; letter-spacing: -0.02em; margin: 0 0 12px; }
.tagline { color: var(--muted); font-size: 1.0625rem; line-height: 1.6; margin: 0 0 28px; }
.actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; height: 44px; padding: 0 20px;
  border-radius: 10px; font-weight: 550; text-decoration: none;
  transition: opacity 150ms ease-out, background 150ms ease-out;
}
.btn-primary { background: var(--fg); color: var(--bg); }
.btn-primary:hover { opacity: 0.88; }
.btn-ghost { border: 1px solid var(--border); color: var(--fg); }
.btn-ghost:hover { background: #161616; }
.note { color: var(--muted); font-size: 0.8125rem; margin-top: 18px; }
footer { color: var(--muted); font-size: 0.8125rem; margin-top: 48px; }