:root {
  /* === TYPOGRAPHY === */
  --font-family-primary: "Inter", sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-md: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 24px;
  --font-size-2xl: 32px;
  --font-weight-normal: var(--font-weight-regular);

  /* === COLORS === */
  /* Primary Colors — defined in tokens.css */
  /* Accent Colors */
  --color-accent-deep: #177DA8;
  --color-accent-secondary: #4589FF;
  --color-accent-tertiary: #F3971F;
  --color-accent-warning: #FFC107;

  /* Status Colors */
  --color-success: #28A745;
  --color-warning: #FFC107;
  --color-danger: #DC3545;
  --color-info: #17A2B8;

  /* Text Colors */
  --color-text-primary: #2A3647;
  --color-text-secondary: #5B6670;
  --color-text-white: #FFFFFF;

  /* Background Colors */
  --color-bg-primary: #F6F7F8;
  --color-bg-secondary: #F6F7FB;
  --color-bg-surface: #FFFFFF;
  --color-bg-surface-muted: #F1F3F5;
  --color-bg-overlay: rgba(0, 0, 0, 0.5);

  /* Border Colors */
  --color-border-light: #D1D1D1;
  --color-border-medium: #E8EAED;
  --color-border-dark: #5B6670;
  --color-border-contacts: #d0d6e4;
  --color-border-dark-alt: #1f2a3a;

  /* === ADDITIONAL COLORS === */
  /* Focus & Interactive */
  --color-focus: #007bff;
  --color-overlay-dark: #000000;
  --color-gray-light: #999;
  --color-gray-disabled: #66666666;

  /* Avatar Colors */
  --color-avatar-orange: #ff7a00;
  --color-avatar-purple: #9327ff;
  --color-avatar-blue: #1f7cff;

  /* Priority Colors */
  --color-priority-urgent: var(--color-urgent);
  --color-priority-medium: var(--color-medium);
  --color-priority-low: var(--color-low);

  /* Label Colors */
  --color-label-userstory: var(--color-label-user-story);

  /* Additional Backgrounds */
  --color-bg-hover: #e7e7e7;
  --color-bg-selected: #f4f4f4;
  --color-bg-contacts: #e8eaf1;
  --color-bg-contacts-light: #d5d9e6;
  --color-bg-contacts-alt: #f8f8fb;
  --color-bg-contacts-modal: #f1f3f8;

  /* Additional Text Colors */
  --color-text-blue: #42526e;
  --color-text-gray: #8f9bb3;
  --color-text-gray-dark: #7d8da6;
  --color-text-gray-medium: #8593ae;
  --color-text-gray-light: #97a3c2;
  --color-text-gray-lighter: #98a1b2;
  --color-text-blue-alt: #2aaae2;

  /* === LEGACY COMPATIBILITY === */

  --bg: var(--color-bg-primary);
  --card: var(--color-bg-surface);
  --text: var(--color-text-primary);
  --accent: var(--color-accent);
  --line: var(--color-border-light);
  --muted: var(--color-text-muted);
  --nav: var(--color-primary);
  --nav-hover: var(--color-primary-hover);
  --nav-active: var(--color-primary-active);

  /* Contacts page specific variables */
  --contacts-accent: var(--color-primary);
  --contacts-primary: var(--color-accent-secondary);
  --contacts-text: var(--color-text-primary);
  --contacts-bg: var(--color-bg-secondary);
  --contact-list-panel-color: var(--color-bg-surface);
  --contacts-detail-panel: var(--color-bg-primary);

  /* === SPACING === */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;

  /* === SIZING === */
  --size-xs: 16px;
  --size-sm: 24px;
  --size-md: 32px;
  --size-lg: 48px;
  --size-xl: 64px;
  --size-2xl: 96px;
  --size-3xl: 128px;

  /* === BORDERS === */
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 16px;
  --border-radius-xl: 24px;
  --border-radius-full: 50%;
  --border-width-thin: 1px;
  --border-width-medium: 2px;
  --border-width-thick: 4px;

  /* === SHADOWS === */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 2px 4px 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);

  /* === TRANSITIONS === */
  --transition-fast: 75ms ease-in-out;
  --transition-normal: 100ms ease-in-out;
  --transition-slow: 125ms ease-in-out;

  /* === LAYOUT === */
  --container-max-width: 1440px;
  --sidebar-width: 280px;
  --header-height: 72px;
  --nav-width: 232px;

  /* === Z-INDEX === */
  --z-dropdown: 1000;
  --z-sticky: 1010;
  --z-fixed: 1020;
  --z-modal-backdrop: 1030;
  --z-modal: 1040;
  --z-popover: 1050;
  --z-tooltip: 1060;
}