:root {
  font-family: "Segoe UI", "Microsoft JhengHei", system-ui, sans-serif;
  color: #1a1a1a;
  background: #f4f5f7;
  line-height: 1.5;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 1rem 1.25rem 2rem;
  max-width: 56rem;
  margin-inline: auto;
}

h1 {
  font-size: 1.35rem;
  font-weight: 700;
}

.privacy-banner {
  background: #0d47a1;
  color: #fff;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.privacy-banner strong {
  color: #ffecb3;
}

.panel {
  background: #fff;
  border-radius: 10px;
  padding: 1rem 1.1rem;
  margin-bottom: 1rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

label {
  display: block;
  font-weight: 600;
  margin-top: 0.75rem;
  margin-bottom: 0.25rem;
}

label:first-of-type {
  margin-top: 0;
}

input[type="password"],
input[type="text"],
select,
textarea {
  width: 100%;
  padding: 0.45rem 0.55rem;
  border: 1px solid #ccc;
  border-radius: 6px;
  font: inherit;
}

textarea {
  min-height: 10rem;
  resize: vertical;
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: flex-end;
}

.row > div {
  flex: 1 1 12rem;
}

button {
  font: inherit;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-weight: 600;
}

button.primary {
  background: #1565c0;
  color: #fff;
}

button.primary:disabled {
  background: #90a4ae;
  cursor: not-allowed;
}

button.secondary {
  background: #eceff1;
  color: #263238;
}

.hint {
  font-size: 0.82rem;
  color: #546e7a;
  margin: 0.25rem 0 0;
}

.log {
  font-family: ui-monospace, monospace;
  font-size: 0.8rem;
  background: #263238;
  color: #eceff1;
  padding: 0.75rem;
  border-radius: 8px;
  white-space: pre-wrap;
  max-height: 12rem;
  overflow: auto;
}

.error {
  color: #b71c1c;
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

.output textarea {
  min-height: 14rem;
}

footer {
  margin-top: 1.5rem;
  font-size: 0.8rem;
  color: #78909c;
}