* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #f6f7f9;
  color: #1f2329;
}
.container { max-width: 1100px; margin: 0 auto; padding: 24px 16px 60px; }
h1 { font-size: 20px; margin: 0 0 4px; }
.sub { color: #8a8f99; font-size: 13px; margin-bottom: 20px; }

.tabs { display: flex; gap: 8px; margin-bottom: 12px; }
.tab {
  background: #eef1f5;
  color: #4b5563;
  border-radius: 6px 6px 0 0;
}
.tab.active { background: #2f6fed; color: #fff; }

.card {
  background: #fff;
  border: 1px solid #e5e6eb;
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
}
label { display: block; font-size: 13px; font-weight: 600; margin: 12px 0 4px; }
label .opt { color: #8a8f99; font-weight: 400; }
input[type="text"], input[type="password"], textarea, select {
  width: 100%;
  border: 1px solid #d0d3d9;
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 14px;
  font-family: inherit;
  background: #fff;
}
textarea { min-height: 90px; resize: vertical; }
textarea.tall { min-height: 160px; }

.row { display: flex; gap: 12px; }
.row > div { flex: 1; }

button {
  border: none;
  border-radius: 6px;
  padding: 8px 18px;
  font-size: 14px;
  cursor: pointer;
  background: #2f6fed;
  color: #fff;
}
button.secondary { background: #eef1f5; color: #1f2329; }
button:disabled { opacity: 0.5; cursor: not-allowed; }
.actions { margin-top: 16px; display: flex; gap: 10px; align-items: center; }

details { margin-top: 12px; }
details summary { cursor: pointer; font-size: 13px; color: #4b5563; }

#output {
  white-space: pre-wrap;
  font-size: 14px;
  line-height: 1.7;
  min-height: 40px;
}
#output-edit { min-height: 320px; font-size: 13px; line-height: 1.6; }

.history-item {
  display: flex;
  justify-content: space-between;
  padding: 8px 4px;
  border-bottom: 1px solid #f0f1f3;
  font-size: 13px;
  cursor: pointer;
}
.history-item:hover { background: #f6f7f9; }
.muted { color: #8a8f99; }
.error { color: #d54941; font-size: 13px; }

.login-box {
  max-width: 360px;
  margin: 18vh auto 0;
  background: #fff;
  border: 1px solid #e5e6eb;
  border-radius: 8px;
  padding: 28px;
}
.login-box h1 { margin-bottom: 16px; }
.login-box button { width: 100%; margin-top: 16px; }