:root {
  --bg: #f7f7fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #2563eb;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}
main {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 24px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.05);
}
h1, h2 { margin-top: 0; }
p { line-height: 1.6; }
small, .muted { color: var(--muted); }
label { display: block; margin: 16px 0 8px; font-weight: 600; }
input[type="text"], select, textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  font: inherit;
}
textarea { min-height: 120px; }
button, .button {
  display: inline-block;
  margin-top: 18px;
  padding: 12px 18px;
  border: 0;
  border-radius: 12px;
  background: var(--accent);
  color: white;
  text-decoration: none;
  font: inherit;
  cursor: pointer;
}
footer {
  margin-top: 28px;
  font-size: 0.95rem;
}
.notice {
  margin-bottom: 20px;
  padding: 12px 14px;
  border-radius: 12px;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
}
.grid {
  display: grid;
  gap: 16px;
}
@media (min-width: 700px) {
  .grid { grid-template-columns: 1fr 1fr; }
}
code {
  background: #f3f4f6;
  padding: 2px 6px;
  border-radius: 6px;
}