:root {
  --bg: #f3f7f6;
  --panel: #ffffff;
  --text: #16322b;
  --muted: #4d6c64;
  --primary: #0b5f4a;
  --line: #d8e5e0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: radial-gradient(circle at top left, #d9ebe4, #f3f7f6 50%);
  color: var(--text);
}

.app {
  max-width: 920px;
  margin: 0 auto;
  padding: 16px;
}

.header h1 {
  margin: 0;
  font-size: 28px;
}

.header p {
  margin: 6px 0 18px;
  color: var(--muted);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  margin-bottom: 12px;
}

.panel h2 {
  margin: 0 0 12px;
  font-size: 18px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
}

input,
textarea,
button {
  font: inherit;
}

input,
textarea {
  border: 1px solid #b9cdc5;
  border-radius: 8px;
  padding: 10px;
  background: #fbfdfc;
  color: var(--text);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

button {
  border: 1px solid #aac4bb;
  border-radius: 8px;
  padding: 10px 12px;
  background: #f5faf8;
  color: var(--text);
  cursor: pointer;
}

button.primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.state {
  margin: 10px 0 0;
  color: var(--muted);
}

.log {
  margin: 8px 0 0;
  border: 1px solid #d6e1dd;
  border-radius: 8px;
  min-height: 180px;
  max-height: 340px;
  overflow: auto;
  background: #0d1e1a;
  color: #d9ffe8;
  padding: 10px;
  white-space: pre-wrap;
}