:root {
  color-scheme: dark;
  --bg: #1b242c;
  --text: #f4f7f8;
  --muted: #c5d4dc;
  --line: #435565;
  --button: #ccdbe2;
  --button-text: #1b242c;
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
}
main {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: 36rem;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}
.mark { margin: 0 0 1rem; color: var(--button); font-size: 1.5rem; line-height: 1; }
h1 { margin: 0; font-size: clamp(2.5rem, 8vw, 4rem); font-weight: 600; letter-spacing: -0.04em; line-height: 1; }
.lede { margin: 1.25rem 0 0; max-width: 28rem; color: var(--muted); font-size: 1.125rem; line-height: 1.5; }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.5rem; margin-top: 2rem; }
.button {
  display: inline-flex; align-items: center; min-height: 44px; padding: 0.65rem 1.1rem;
  border-radius: 999px; background: var(--button); color: var(--button-text); font-weight: 600; text-decoration: none;
}
.button:hover { background: #fff; }
.button:focus-visible, .text-link:focus-visible { outline: 2px solid var(--button); outline-offset: 3px; }
.text-link { color: var(--muted); }
.text-link:hover { color: var(--text); }