:root {
  /* Colors - Primary */
  --color-primary: #FF5501;
  --color-primary-hover: #E84D00;
  --color-primary-subtle: #FF6533;

  /* Colors - Surfaces */
  --color-surface: #FFFFFF;
  --color-surface-raised: #F8FAFC;
  --color-surface-overlay: #F1F5F9;

  /* Colors - Borders */
  --color-border: #E2E8F0;
  --color-border-strong: #CBD5E1;

  /* Colors - Text */
  --color-text-primary: #0F172A;
  --color-text-secondary: #475569;
  --color-text-placeholder: #94A3B8;
  --color-text-inverse: #FFFFFF;

  /* Colors - Semantic */
  --color-success: #16A34A;
  --color-success-subtle: #F0FDF4;
  --color-warning: #D97706;
  --color-warning-subtle: #FFFBEB;
  --color-error: #DC2626;
  --color-error-subtle: #FEF2F2;
  --color-info: #0284C7;
  --color-info-subtle: #F0F9FF;

  /* Component-friendly aliases */
  --color-bg: var(--color-surface);
  --color-bg-secondary: var(--color-surface-raised);
  --color-text: var(--color-text-primary);
  --color-text-muted: var(--color-text-secondary);

  /* Spacing */
  --spacing-1: 4px;
  --spacing-2: 8px;
  --spacing-3: 12px;
  --spacing-4: 16px;
  --spacing-6: 24px;
  --spacing-8: 32px;
  --spacing-12: 48px;
  --spacing-16: 64px;
  --spacing-20: 80px;
  --spacing-24: 96px;

  /* Spacing aliases for components */
  --space-xs: var(--spacing-2);
  --space-sm: var(--spacing-3);
  --space-md: var(--spacing-4);
  --space-lg: var(--spacing-6);
  --space-xl: var(--spacing-8);
  --space-2xl: var(--spacing-12);
  --space-3xl: var(--spacing-16);

  /* Layout */
  --nav-height: 64px;
  --header-height: var(--nav-height);
  --max-content-width: 1280px;
  --sidebar-width: 240px;
  --sidebar-collapsed: 64px;

  /* Border radius */
  --radius-sm: 4px;
  --radius-base: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-base: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 25px rgba(0,0,0,0.1);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 16px;
  --text-lg: 18px;
  --text-xl: 20px;
  --text-2xl: 24px;
}

/* Dark theme support */
@media (prefers-color-scheme: dark) {
  :root {
    --color-surface: #0F172A;
    --color-surface-raised: #1E293B;
    --color-surface-overlay: #334155;
    --color-text-primary: #F8FAFC;
    --color-text-secondary: #CBD5E1;
    --color-text-placeholder: #64748B;
    --color-border: #334155;
    --color-border-strong: #475569;
  }
}

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

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

a {
  color: #FF5501;
  transition: color 0.2s;
}

a:hover {
  color: #E84D00;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

code {
  background: #f3f4f6;
  padding: 0.125rem 0.375rem;
  border-radius: 0.25rem;
  font-size: 0.875em;
  font-family: 'Monaco', 'Courier New', monospace;
}

pre {
  background: #1f2937;
  color: #f9fafb;
  padding: 1rem;
  border-radius: 0.5rem;
  overflow-x: auto;
  margin: 1rem 0;
}

pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

/* Utility classes */
.container {
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.btn {
  display: inline-block;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
  border: 2px solid transparent;
  cursor: pointer;
  font-size: var(--text-base);
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  text-decoration: none;
}

.btn-outline {
  background: transparent;
  border-color: var(--color-border-strong);
  color: var(--color-text);
}

.btn-outline:hover {
  background: var(--color-surface-raised);
  text-decoration: none;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}