:root { font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; }
body { margin: 0; background: #f6f7fb; color: #111; }
.container { max-width: 760px; margin: 40px auto; padding: 0 16px; }
h1 { margin: 0 0 8px; font-size: 32px; }
.hint { margin: 0 0 16px; color: #444; }
.card {
  background: #fff;
  border-radius: 12px;
  padding: 18px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  display: grid;
  gap: 10px;
}
label { font-weight: 600; }
input, textarea {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid #d7dbe7;
  font-size: 16px;
}
textarea { resize: vertical; }
.actions { display: flex; gap: 10px; }
button {
  border: none;
  border-radius: 10px;
  padding: 10px 14px;
  font-weight: 700;
  cursor: pointer;
}
button.secondary { background: #eef0f6; }
button:not(.secondary) { background: #1f6feb; color: white; }
.error { color: #b00020; min-height: 20px; }
footer { margin-top: 12px; color: #666; }
code { background: #eef0f6; padding: 2px 6px; border-radius: 6px; }