/* ==============================================
   DESIGN SYSTEM - CSS VARIABLES
   Sistema de variáveis para consistência visual
   ============================================== */

:root {
  /* ==================
     CORES PRIMÁRIAS
     ================== */
  --color-primary: #2563EB;
  --color-primary-hover: #0056b3;
  --color-primary-active: #004494;
  --color-primary-light: #e7f1ff;
  --color-primary-border: #b8daff;

  /* ==================
     CORES DE FUNDO
     ================== */
  --color-background: #FFFFFF;
  --color-background-secondary: #F8F9FA;
  --color-background-tertiary: #E9ECEF;
  --color-background-hover: #F1F3F5;

  /* ==================
     CORES ESCURAS
     ================== */
  --color-dark: #343A40;
  --color-dark-secondary: #495057;
  --color-dark-tertiary: #6C757D;
  --color-dark-muted: #ADB5BD;

  /* ==================
     CORES DE FEEDBACK
     ================== */
  --color-success: #28A745;
  --color-success-light: #d4edda;
  --color-success-border: #c3e6cb;

  --color-error: #DC3545;
  --color-error-light: #f8d7da;
  --color-error-border: #f5c6cb;

  --color-warning: #FFC107;
  --color-warning-light: #fff3cd;
  --color-warning-border: #ffeeba;

  --color-info: #17A2B8;
  --color-info-light: #d1ecf1;
  --color-info-border: #bee5eb;

  /* ==================
     BORDAS
     ================== */
  --border-color: #DEE2E6;
  --border-color-light: #E9ECEF;
  --border-color-dark: #CED4DA;
  --border-radius-sm: 4px;
  --border-radius-md: 6px;
  --border-radius-lg: 8px;
  --border-radius-xl: 12px;
  --border-width: 1px;

  /* ==================
     TIPOGRAFIA
     ================== */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Mono', 'Droid Sans Mono', monospace;

  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */

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

  --line-height-tight: 1.25;
  --line-height-base: 1.5;
  --line-height-relaxed: 1.625;

  /* ==================
     ESPAÇAMENTOS
     ================== */
  --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 */

  /* ==================
     SOMBRAS
     ================== */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.08), 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);

  /* ==================
     TAMANHOS
     ================== */
  --input-height: 40px;
  --input-height-sm: 32px;
  --input-height-lg: 48px;
  --button-height: 40px;
  --button-height-sm: 32px;
  --button-height-lg: 48px;

  /* ==================
     LARGURAS
     ================== */
  --max-width-xs: 320px;
  --max-width-sm: 400px;
  --max-width-md: 560px;
  --max-width-lg: 768px;
  --max-width-xl: 1024px;
  --max-width-2xl: 1280px;

  /* ==================
     Z-INDEX
     ================== */
  --z-index-dropdown: 100;
  --z-index-sticky: 200;
  --z-index-fixed: 300;
  --z-index-modal-backdrop: 400;
  --z-index-modal: 500;
  --z-index-popover: 600;
  --z-index-tooltip: 700;
  --z-index-toast: 800;

  /* ==================
     TRANSIÇÕES
     ================== */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
}