* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 16px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: #0f172a; color: #f1f5f9;
}
.card {
  width: 100%; max-width: 420px; text-align: center; padding: 32px 28px;
  background: #1e293b; border: 1px solid #334155; border-radius: 16px;
}
.card img { border-radius: 22px; }
h1 { margin: 12px 0 4px; font-size: 1.6rem; }
.lead { margin: 0 0 24px; color: #94a3b8; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 12px;
  background: #fff; color: #1f2937; text-decoration: none; font-weight: 600;
  padding: 12px 20px; border-radius: 10px; width: 100%;
}
.btn:hover { background: #e2e8f0; }
.btn svg { width: 22px; height: 22px; }
.error { margin: 16px 0 0; padding: 10px 12px; border-radius: 8px; background: #7f1d1d; color: #fecaca; font-size: .9rem; }
.error[hidden] { display: none; }
.note { margin: 20px 0 0; color: #94a3b8; font-size: .85rem; line-height: 1.5; }