:root {
  --color-bg: #fafaf9;
  --color-surface: #ffffff;
  --color-text: #1c1917;
  --color-text-muted: #78716c;
  --color-accent: #d97706;
  --color-accent-hover: #b45309;
  --color-border: #e7e5e4;
  --font-sans: system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, monospace;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

.container { max-width: 720px; margin: 0 auto; padding: 2rem 1.5rem; }

.site-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.logo {
  text-decoration: none;
  color: var(--color-text);
  font-weight: 700;
  font-size: 1.25rem;
}

.site-footer {
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background: var(--color-accent);
  color: white;
  text-decoration: none;
  border-radius: var(--radius);
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background 0.15s;
}

.btn:hover { background: var(--color-accent-hover); }

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.tag {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  background: var(--color-border);
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-right: 0.25rem;
}

.prompt-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  white-space: pre-wrap;
  position: relative;
}

.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
}

@media (max-width: 600px) {
  .container { padding: 1rem; }
}