/* ============================================
   MS tablets — Design System Variables
   ============================================ */
:root {
  /* Primary Colors */
  --color-primary: #0066FF;
  --color-primary-dark: #0052CC;
  --color-primary-light: #3385FF;
  --color-primary-hover: #0055DD;
  --color-primary-rgb: 0, 102, 255;

  /* Accent Colors */
  --color-accent: #FF6B35;
  --color-accent-dark: #E55A28;
  --color-accent-light: #FF8A5C;
  --color-accent-rgb: 255, 107, 53;

  /* Neutrals */
  --color-bg: #FAFBFC;
  --color-surface: #FFFFFF;
  --color-surface-alt: #F1F5F9;
  --color-surface-hover: #F8FAFC;
  --color-border: #E2E8F0;
  --color-border-light: #F1F5F9;
  --color-divider: #E2E8F0;

  /* Text */
  --color-text: #1A1A2E;
  --color-text-secondary: #64748B;
  --color-text-muted: #94A3B8;
  --color-text-inverse: #FFFFFF;

  /* Semantic */
  --color-success: #10B981;
  --color-success-bg: #ECFDF5;
  --color-error: #EF4444;
  --color-error-bg: #FEF2F2;
  --color-warning: #F59E0B;
  --color-warning-bg: #FFFBEB;
  --color-info: #3B82F6;
  --color-info-bg: #EFF6FF;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.10);
  --shadow-xl: 0 16px 48px rgba(0,0,0,0.12);
  --shadow-card: 0 2px 12px rgba(0,0,0,0.06);
  --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.12);
  --shadow-header: 0 1px 3px rgba(0,0,0,0.05);

  /* Typography */
  --font-heading: 'Clash Display', 'Inter', sans-serif;
  --font-body: 'Manrope', 'Inter', sans-serif;

  --fs-xs: clamp(0.7rem, 0.65rem + 0.25vw, 0.75rem);
  --fs-sm: clamp(0.8rem, 0.75rem + 0.25vw, 0.875rem);
  --fs-base: clamp(0.875rem, 0.825rem + 0.25vw, 1rem);
  --fs-md: clamp(1rem, 0.925rem + 0.375vw, 1.125rem);
  --fs-lg: clamp(1.125rem, 1rem + 0.5vw, 1.25rem);
  --fs-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
  --fs-2xl: clamp(1.5rem, 1.25rem + 1.25vw, 2rem);
  --fs-3xl: clamp(1.875rem, 1.5rem + 1.875vw, 2.5rem);
  --fs-4xl: clamp(2.25rem, 1.75rem + 2.5vw, 3.25rem);
  --fs-5xl: clamp(2.75rem, 2rem + 3.75vw, 4.5rem);

  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;

  --lh-tight: 1.15;
  --lh-snug: 1.3;
  --lh-normal: 1.5;
  --lh-relaxed: 1.65;

  --ls-tight: -0.025em;
  --ls-normal: 0;
  --ls-wide: 0.025em;
  --ls-wider: 0.05em;
  --ls-widest: 0.1em;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Layout */
  --container-max: 1280px;
  --container-wide: 1440px;
  --container-narrow: 960px;
  --container-padding: clamp(1rem, 2vw, 2rem);
  --grid-gap: clamp(1rem, 2vw, 1.5rem);
  --header-height: 72px;

  /* Borders */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;

  /* Z-Index */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-toast: 500;
}

/* Dark mode — via manual toggle */
[data-theme="dark"] {
  --color-bg: #0F1117;
  --color-surface: #1A1D27;
  --color-surface-alt: #22252F;
  --color-surface-hover: #282B35;
  --color-border: #2D3141;
  --color-border-light: #22252F;
  --color-divider: #2D3141;
  --color-text: #F0F2F5;
  --color-text-secondary: #94A3B8;
  --color-text-muted: #64748B;
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.2);
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.25);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.35);
  --shadow-xl: 0 16px 48px rgba(0,0,0,0.4);
  --shadow-card: 0 2px 12px rgba(0,0,0,0.25);
  --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.35);
  --shadow-header: 0 1px 3px rgba(0,0,0,0.3);
}

/* Dark mode — via system preference (only if no explicit toggle) */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #0F1117;
    --color-surface: #1A1D27;
    --color-surface-alt: #22252F;
    --color-surface-hover: #282B35;
    --color-border: #2D3141;
    --color-border-light: #22252F;
    --color-divider: #2D3141;
    --color-text: #F0F2F5;
    --color-text-secondary: #94A3B8;
    --color-text-muted: #64748B;
    --shadow-xs: 0 1px 2px rgba(0,0,0,0.2);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.25);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.3);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.35);
    --shadow-xl: 0 16px 48px rgba(0,0,0,0.4);
    --shadow-card: 0 2px 12px rgba(0,0,0,0.25);
    --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.35);
    --shadow-header: 0 1px 3px rgba(0,0,0,0.3);
  }
}