:root {
  /* =========================================
     Color Palette - Premium & Modern
     ========================================= */

  /* Primary Brand Colors */
  --color-primary: #0F172A;
  /* Slate 900 - Deep, professional dark */
  --color-primary-light: #334155;
  /* Slate 700 */
  --color-primary-dark: #020617;
  /* Slate 950 */

  /* Accent Colors */
  --color-accent: #3B82F6;
  /* Blue 500 - Vibrant, trustworthy */
  --color-accent-light: #60A5FA;
  /* Blue 400 */
  --color-accent-dark: #2563EB;
  /* Blue 600 */

  /* Logo Brand Color */
  --color-logo-blue: #2344FD;
  /* Brand Blue from logo */

  /* Secondary Accent */
  --color-secondary: #8B5CF6;
  /* Violet 500 - Creative, modern */

  /* Level Indicators */
  --color-beginner: #10B981;
  /* Emerald 500 - Fresh, easy */
  --color-pro: #3B82F6;
  /* Blue 500 - Professional */
  --color-master: #F59E0B;
  /* Amber 500 - Expert, gold */

  /* Neutral Scales */
  --color-bg: #FFFFFF;
  --color-bg-secondary: #F8FAFC;
  /* Slate 50 */
  --color-bg-tertiary: #F1F5F9;
  /* Slate 100 */

  --color-text: #0F172A;
  /* Slate 900 */
  --color-text-secondary: #475569;
  /* Slate 600 */
  --color-text-muted: #94A3B8;
  /* Slate 400 */
  --color-text-inverse: #FFFFFF;

  --color-border: #E2E8F0;
  /* Slate 200 */
  --color-border-hover: #CBD5E1;
  /* Slate 300 */

  /* Functional Colors */
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;

  /* =========================================
     Typography
     ========================================= */

  --font-primary: 'Plus Jakarta Sans', sans-serif;
  /* Modern, geometric sans */
  --font-body: 'Inter', sans-serif;
  /* Clean, readable sans */
  --font-mono: 'JetBrains Mono', monospace;

  /* =========================================
     Spacing System (8pt grid)
     ========================================= */

  --spacing-xs: 0.25rem;
  /* 4px */
  --spacing-sm: 0.5rem;
  /* 8px */
  --spacing-md: 1rem;
  /* 16px */
  --spacing-lg: 1.5rem;
  /* 24px */
  --spacing-xl: 2rem;
  /* 32px */
  --spacing-2xl: 3rem;
  /* 48px */
  --spacing-3xl: 4rem;
  /* 64px */

  /* =========================================
     Border Radius
     ========================================= */

  --radius-sm: 0.375rem;
  /* 6px */
  --radius-md: 0.75rem;
  /* 12px */
  --radius-lg: 1rem;
  /* 16px */
  --radius-xl: 1.5rem;
  /* 24px */
  --radius-full: 9999px;

  /* =========================================
     Shadows (Subtle & Premium)
     ========================================= */

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.06);

  /* =========================================
     Transitions
     ========================================= */

  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);

  /* =========================================
     Layout
     ========================================= */

  --container-max-width: 1280px;
  --header-height: 80px;
}