:root {
  color: #1c1917;
  background: #f6f4f1;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

* { box-sizing: border-box; }

body {
  margin: 0;
}

main {
  max-width: 36rem;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3rem;
}

h1 {
  margin: 0 0 1.5rem;
  font-size: 1.5rem;
  font-weight: 650;
}

label {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.92rem;
}

input, textarea, button {
  font: inherit;
}

input, textarea {
  width: 100%;
  border: 1px solid #d6d3d1;
  border-radius: 0.6rem;
  background: #fff;
  color: inherit;
}

input {
  padding: 0.75rem 0.85rem;
}

textarea {
  min-height: 22rem;
  padding: 0.75rem 0.85rem;
  resize: vertical;
  overflow: hidden;
  word-break: break-all;
  line-height: 1.45;
}

button {
  border: 0;
  border-radius: 0.6rem;
  background: #1c1917;
  color: #fafaf9;
  padding: 0.75rem 1rem;
  cursor: pointer;
}

button:disabled {
  opacity: 0.55;
  cursor: default;
}

#submit {
  width: 100%;
  margin-top: 0.75rem;
}

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin: 1.25rem 0 0.5rem;
}

.row p {
  margin: 0;
  color: #44403c;
}

#copy {
  background: #fff;
  color: #1c1917;
  border: 1px solid #d6d3d1;
  padding: 0.4rem 0.75rem;
}

.message {
  margin: 1rem 0 0;
  color: #9f1239;
}

.message.ok {
  color: #44403c;
}