:root {
  color-scheme: light;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b6b6b;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --border: #e2e2e2;
  --card: #f7f7f8;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.5;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 20px 80px;
}

h1 { font-size: 2rem; margin-bottom: 4px; }
h2 { font-size: 1.25rem; margin-top: 40px; }
p.lead { color: var(--muted); font-size: 1.05rem; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin-top: 20px;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}
.btn:hover { background: var(--accent-dark); }
.btn.secondary { background: transparent; color: var(--accent); border: 1px solid var(--accent); }

.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }

input[type="number"], input[type="email"] {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  width: 100%;
  max-width: 220px;
}

label { display: block; font-weight: 600; margin-bottom: 6px; }

.status { margin-top: 16px; min-height: 1.4em; }
.status.error { color: #b91c1c; }
.status.ok { color: #15803d; }

code.key {
  display: block;
  background: #111827;
  color: #e5e7eb;
  padding: 14px;
  border-radius: 8px;
  word-break: break-all;
  font-size: 0.9rem;
  margin: 12px 0;
}

footer { margin-top: 60px; color: var(--muted); font-size: 0.85rem; }