:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --line: #d1d5db;
  --primary: #0f766e;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "Hiragino Sans", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 10% 10%, #dbeafe 0%, transparent 30%),
    radial-gradient(circle at 90% 90%, #ccfbf1 0%, transparent 28%),
    var(--bg);
}

.page {
  width: min(860px, 100%);
  margin: 0 auto;
  padding: 2rem 1rem 2.5rem;
}

h1 {
  margin: 0 0 0.5rem;
}

.lead {
  margin: 0 0 1.25rem;
  color: var(--muted);
}

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
  display: grid;
  gap: 0.8rem;
}

.field {
  display: grid;
  gap: 0.35rem;
}

.field span {
  font-size: 0.92rem;
  font-weight: 600;
}

input,
.field textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.62rem 0.72rem;
  font: inherit;
}

.field textarea {
  resize: vertical;
}

.actions {
  display: flex;
  gap: 0.6rem;
  align-items: center;
}

button {
  border: 0;
  border-radius: 8px;
  padding: 0.56rem 0.86rem;
  font: inherit;
  color: #ffffff;
  background: var(--primary);
  cursor: pointer;
}

button[data-copy] {
  background: #374151;
}

[data-status] {
  color: var(--muted);
  font-size: 0.9rem;
}

.output-label {
  display: block;
  font-size: 0.92rem;
  font-weight: 600;
}

.output-section {
  margin-top: 1rem;
}

.output-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.output-head button {
  background: #374151;
}

.output {
  margin-top: 0.4rem;
  width: 100%;
  min-height: 180px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.9rem;
  font: 14px/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  resize: vertical;
  background: #111827;
  color: #e5e7eb;
}