:root {
  --bg: #ffffff;
  --ink: #202124;
  --muted: #5f6368;
  --accent: #1a73e8;
  --line: #dadce0;
  --soft: #f1f3f4;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, PingFang SC, Microsoft YaHei, Arial;
  background: var(--bg);
  color: var(--ink);
  font-size: 20px;
  line-height: 1.5;
}

a { color: var(--accent); text-decoration: none; }

a:hover { text-decoration: underline; }

h1 { margin: 0; font-size: 22px; }

label { display:block; margin: 10px 0 6px; font-size: 14px; color: var(--muted); }

input, textarea {
  width: 100%;
  padding: 12px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  font-size: 16px;
}

textarea {
  resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 14px;
}

.row { display:flex; gap: 12px; align-items: center; flex-wrap: wrap; }

button {
  border: 1px solid transparent;
  background: var(--accent);
  color: #fff;
  padding: 12px 14px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 700;
  font-size: 16px;
}

button.secondary { background: #fff; color: var(--ink); border-color: var(--line); }

button:disabled { opacity: 0.6; cursor: not-allowed; }

.card { border: 1px solid var(--line); border-radius: 14px; padding: 16px; background: #fff; }

.muted { color: var(--muted); font-size: 16px; }

.help { color: var(--muted); font-size: 14px; }

.error { color: #b00020; font-size: 16px; margin-top: 10px; }

.hidden { display: none !important; }

.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 13px;
}