:root {
  --fg: #1f1f1f;
  --muted: #666;
  --accent: #b33;
  --line: #e3e3e3;
  --bg: #fafafa;
  --card: #ffffff;
}
* { box-sizing: border-box; }
body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  color: var(--fg);
  background: var(--bg);
  margin: 0;
  line-height: 1.5;
}
body.centered {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 20px;
}
.card {
  background: var(--card);
  padding: 32px;
  border-radius: 6px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
  max-width: 460px;
  width: 100%;
}
.card h1 { margin: 0 0 8px; font-size: 22px; }
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}
.topbar {
  background: var(--fg);
  color: white;
  padding: 10px 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
}
.topbar .link {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.3);
  color: white;
  padding: 4px 10px;
  border-radius: 3px;
  cursor: pointer;
  font-size: 12px;
}
input[type=email], input[type=text] {
  width: 100%;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 4px;
  font-size: 15px;
  margin: 4px 0 14px;
}
label { display: block; font-size: 13px; color: var(--muted); margin-top: 10px; }
button, .cta {
  background: var(--accent);
  color: white;
  padding: 10px 18px;
  border: none;
  border-radius: 4px;
  font-size: 15px;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}
.cta.secondary {
  background: white;
  color: var(--fg);
  border: 1px solid #bbb;
  margin-left: 8px;
}
.cta:hover { filter: brightness(0.95); }
button:disabled { opacity: 0.6; cursor: default; }
.error { background: #fee; padding: 10px; border-left: 3px solid #c33; border-radius: 3px; color: #900; font-size: 14px; }
.fine { font-size: 12px; color: var(--muted); margin-top: 14px; }
.info { margin-top: 30px; padding: 16px; background: var(--card); border-radius: 6px; border: 1px solid var(--line); }
.info h2 { font-size: 15px; margin-top: 0; }
.info ul { margin: 8px 0; padding-left: 20px; font-size: 14px; }
.lead { font-size: 16px; margin: 10px 0 20px; color: var(--muted); }
code { background: #f1f1f1; padding: 1px 4px; border-radius: 2px; font-size: 0.93em; }
a { color: var(--accent); }