/* ==========================================================================
   Base Styles & Utility Tokens
   ========================================================================== */

:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
}

/* Accessibility Font Size Scales */
html[data-font-size="sm"] { font-size: 14px; }
html[data-font-size="md"] { font-size: 16px; }
html[data-font-size="lg"] { font-size: 18px; }
html[data-font-size="xl"] { font-size: 20px; }

body {
  font-family: var(--font-sans);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Active tab styles */
.tab-btn.active {
  background-color: #ffffff;
  color: #1e293b;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05), 0 1px 2px rgba(0,0,0,0.02);
}
[data-theme="dark"] .tab-btn.active {
  background-color: #1e293b;
  color: #ffffff;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

/* Utility buttons */
.control-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  border: 1px solid #e2e8f0;
  background: #ffffff;
  font-size: 12px;
  font-weight: 600;
  color: #475569;
  cursor: pointer;
  transition: all 0.15s ease;
}
[data-theme="dark"] .control-btn {
  border-color: #334155;
  background: #1e293b;
  color: #cbd5e1;
}
.control-btn:hover {
  background: #f8fafc;
  color: #0f172a;
}
[data-theme="dark"] .control-btn:hover {
  background: #334155;
  color: #ffffff;
}