:root {
  --color-bg:      #ffffff;
  --color-surface: #f5f5f5;
  --color-text:    #111111;
  --color-accent:  #2d7a2d;
  --color-border:  #dddddd;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg:      #111111;
    --color-surface: #1e1e1e;
    --color-text:    #eeeeee;
    --color-accent:  #5dba5d;
    --color-border:  #333333;
  }
}

[data-theme="dark"] {
  --color-bg:      #111111;
  --color-surface: #1e1e1e;
  --color-text:    #eeeeee;
  --color-accent:  #5dba5d;
  --color-border:  #333333;
}

*{ margin: 0; padding: 0; }

body {
  font-family: monospace;
  background: var(--color-bg);
  color: var(--color-text);
  max-width: 760px;
  margin: 40px auto;
  padding: 0 24px 60px;
  transition: background .3s, color .3s;
}

.back { display: inline-block; margin-bottom: 24px; color: var(--color-accent); text-decoration: none; font-size: 13px; }
h1 { font-size: 20px; color: var(--color-accent); margin-bottom: 20px; }
h2 { font-size: 15px; margin: 32px 0 12px; border-bottom: 1px solid var(--color-border); padding-bottom: 6px; }
h3 { font-size: 14px; margin-bottom: 10px; }
p  { font-size: 13px; line-height: 1.6; }

#toggle {
  padding: 8px 20px;
  background: var(--color-accent);
  color: #fff;
  border: none;
  font-family: monospace;
  font-size: 13px;
  cursor: pointer;
  border-radius: 3px;
  margin-bottom: 8px;
}

.demo-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 24px;
  border-radius: 4px;
  margin-top: 12px;
}

.btn {
  display: inline-block;
  margin-top: 16px;
  padding: 8px 20px;
  background: var(--color-accent);
  color: #fff;
  text-decoration: none;
  font-size: 13px;
  border-radius: 3px;
}

.questions { display: flex; flex-direction: column; gap: 16px; }
.qa { padding: 16px; background: var(--color-surface); border-left: 3px solid var(--color-accent); }
.q  { font-weight: bold; margin-bottom: 8px; }

pre {
  background: #111;
  color: #7fff7f;
  padding: 12px 16px;
  border-radius: 4px;
  font-size: 13px;
  overflow-x: auto;
}