/* =============================================
   Design Tokens — Premium Fitness Platform
   iOS-inspired liquid glass design system
   ============================================= */

:root {
  /* ── Colors: warm bronze gym palette ── */
  --color-bg: #F5F5F5;
  --color-bg-warm: #F9F8F7;
  --color-surface: rgba(255, 255, 255, 0.72);
  --color-surface-solid: #FFFFFF;
  --color-glass: rgba(255, 255, 255, 0.55);
  --color-glass-hover: rgba(255, 255, 255, 0.68);
  --color-glass-border: rgba(160, 150, 140, 0.25);
  --color-glass-dark: rgba(32, 26, 22, 0.50);
  --color-glass-dark-border: rgba(200, 175, 150, 0.10);

  /* Brand — warm bronze */
  --color-primary: #A07850;
  --color-primary-light: #C09A78;
  --color-primary-dark: #7D5C3A;
  --color-primary-bg: rgba(160, 120, 80, 0.10);
  --color-secondary: #7A6E65;
  --color-secondary-light: #9A8E85;
  --color-secondary-bg: rgba(122, 110, 101, 0.10);

  /* Semantic */
  --color-success: #5A9E3E;
  --color-success-light: #A3D48E;
  --color-success-bg: rgba(90, 158, 62, 0.10);
  --color-warning: #D9901A;
  --color-warning-light: #F0C060;
  --color-warning-bg: rgba(217, 144, 26, 0.10);
  --color-danger: #C4413A;
  --color-danger-dark: #A33530;
  --color-danger-light: #E08880;
  --color-danger-bg: rgba(196, 65, 58, 0.10);
  --color-info: #6A9DB8;
  --color-info-bg: rgba(106, 157, 184, 0.10);

  /* Text */
  --color-text: #2C2420;
  --color-text-secondary: #7D746C;
  --color-text-tertiary: #A89E96;
  --color-text-inverse: #FBF8F5;
  --color-text-link: var(--color-primary);

  /* Borders & overlays */
  --color-border: rgba(50, 35, 20, 0.07);
  --color-border-strong: rgba(50, 35, 20, 0.14);
  --color-overlay: rgba(30, 22, 16, 0.30);
  --color-overlay-heavy: rgba(30, 22, 16, 0.55);
  --color-focus-ring: rgba(160, 120, 80, 0.40);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #B8956A, #7A5C3A);
  --gradient-warm: linear-gradient(135deg, #D9901A, #B87040);
  --gradient-cool: linear-gradient(135deg, #6A9DB8, #507A90);
  --gradient-success: linear-gradient(135deg, #5A9E3E, #6DB850);
  --gradient-glass: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.6),
    rgba(255, 255, 255, 0.3)
  );

  /* ── Spacing (8px grid) ── */
  --space-2xs: 2px;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* ── Border radius ── */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 9999px;

  /* ── Typography ── */
  --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display',
    'SF Pro Text', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'SF Mono', SFMono-Regular, Menlo, Consolas, monospace;

  --font-size-xs: 11px;
  --font-size-sm: 13px;
  --font-size-base: 15px;
  --font-size-md: 17px;
  --font-size-lg: 20px;
  --font-size-xl: 24px;
  --font-size-2xl: 28px;
  --font-size-3xl: 34px;

  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.2;
  --line-height-base: 1.47;
  --line-height-relaxed: 1.6;

  --letter-spacing-tight: -0.02em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.04em;

  /* ── Shadows ── */
  --shadow-xs: 0 0.5px 1px rgba(0, 0, 0, 0.03);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12);
  --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.06);
  --shadow-glass-lg: 0 12px 40px rgba(0, 0, 0, 0.1);
  --shadow-inner: inset 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-button: 0 2px 8px rgba(160, 120, 80, 0.30);
  --shadow-button-hover: 0 4px 16px rgba(160, 120, 80, 0.40);

  /* ── Blur ── */
  --blur-sm: 10px;
  --blur-md: 20px;
  --blur-lg: 40px;
  --blur-xl: 60px;

  /* ── Animation ── */
  --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-in-out: cubic-bezier(0.42, 0, 0.58, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.27, 1.55);

  --transition-fast: 120ms var(--ease-out);
  --transition-base: 200ms var(--ease-out);
  --transition-slow: 300ms var(--ease-out);
  --transition-spring: 400ms var(--ease-spring);

  --duration-fast: 120ms;
  --duration-base: 200ms;
  --duration-slow: 300ms;

  /* ── Layout ── */
  --nav-height: 80px;
  --header-height: 56px;
  --safe-area-top: env(safe-area-inset-top, 0px);
  --safe-area-bottom: env(safe-area-inset-bottom, 0px);
  --safe-area-left: env(safe-area-inset-left, 0px);
  --safe-area-right: env(safe-area-inset-right, 0px);
  --content-max-width: 480px;
  --content-padding: var(--space-md);

  /* ── Z-index scale ── */
  --z-base: 0;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-header: 300;
  --z-bottom-nav: 350;
  --z-overlay: 400;
  --z-modal: 500;
  --z-toast: 600;
  --z-tooltip: 700;
}