:root {
  --ink: #111;
  --muted: #444;
  --card: #fff;
  --accent: #222;
  --accent-2: #333;
  --ok: #166534;
  --warn: #92400e;
  --error: #991b1b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background: #fff;
  min-height: 100vh;
  padding: 2rem 1rem;
}

.container {
  max-width: 820px;
  margin: 0 auto;
}

.card {
  background: var(--card);
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 1.5rem;
}

h1 {
  margin-top: 0;
  font-size: clamp(1.5rem, 4vw, 2.3rem);
}

p {
  color: var(--muted);
}

label {
  display: block;
  margin-top: 1rem;
  font-weight: 600;
}

input,
textarea,
button {
  width: 100%;
  margin-top: 0.4rem;
  border-radius: 10px;
  border: 1px solid #c9d3da;
  padding: 0.7rem 0.8rem;
  font: inherit;
}

textarea {
  min-height: 130px;
  resize: vertical;
}

button {
  background: var(--accent);
  color: #fff;
  border: none;
  font-weight: 700;
  margin-top: 1.2rem;
  cursor: pointer;
  transition: background-color 150ms ease;
}

button:hover {
  background: var(--accent-2);
}

.notice {
  margin-top: 1rem;
  padding: 0.75rem 0.9rem;
  border-radius: 10px;
  display: none;
}

.notice.show {
  display: block;
}

.notice.ok {
  background: #dcfce7;
  color: var(--ok);
  border: 1px solid #86efac;
}

.notice.warn {
  background: #fef3c7;
  color: var(--warn);
  border: 1px solid #fcd34d;
}

.notice.error {
  background: #fee2e2;
  color: var(--error);
  border: 1px solid #fca5a5;
}

.meta {
  margin-top: 1rem;
  padding: 0.75rem;
  border: 1px solid #ddd;
  border-radius: 6px;
  background: #fff;
}

code {
  background: #f3f4f6;
  padding: 0.12rem 0.35rem;
  border-radius: 6px;
}

@media (max-width: 640px) {
  body {
    padding: 1rem 0.75rem;
  }

  .card {
    padding: 1rem;
    border-radius: 14px;
  }
}