:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --surface-2: #eef1f5;
  --border: #dde1ea;
  --text: #1a1d2e;
  --text-dim: #5a607a;
  --accent: #006b3f;
  --input-trace: #1f5fbf;
  --output-trace: #006b3f;
  --response-trace: #c2660a;
  --grid: rgba(0, 0, 0, 0.08);
  --danger: #c0392b;
  --radius: 10px;
  --font: "Roboto Flex", system-ui, sans-serif;

  --header-bg: #fff;
  --header-border: #006a4e;
  --header-text: #006a4e;
  --header-sub: #5a7a6a;
}

[data-theme="dark"] {
  --bg: #0f1613;
  --surface: #17211c;
  --surface-2: #1f2c25;
  --border: #2b3a32;
  --text: #e8efeb;
  --text-dim: #9fb0a7;
  --accent: #5ee0b5;
  --input-trace: #7fb7ff;
  --output-trace: #5ee0b5;
  --response-trace: #ffb35e;
  --grid: rgba(255, 255, 255, 0.07);
  --danger: #ff6b6b;

  --header-bg: #111;
  --header-border: #1d9e75;
  --header-text: #4ecda0;
  --header-sub: #6aad8a;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.45;
  transition: background 0.2s, color 0.2s;
}

body {
  padding-bottom: 24px;
}

.page-body {
  padding: 20px 5% 0;
  max-width: 1280px;
  margin: 0 auto;
}

.intro {
  margin: 0 0 18px;
  color: var(--text-dim);
  font-size: 15px;
  line-height: 1.6;
  max-width: 900px;
}