/* ==============================================
   BASE STYLES - PROFESSIONAL
   ============================================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Colors */
  --primary: #0d6efd;
  --success: #28a745;
  --danger: #dc3545;
  --warning: #ffc107;
  --info: #17a2b8;
  --light: #f8f9fa;
  --dark: #212529;
  --text-primary: #1a1a1a;
  --text-muted: #666666;
  --border-color: #e0e0e0;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  background-color: #f5f5f5;
  color: var(--text-primary);
  overflow-x: hidden;
  line-height: 1.6;
}

/* Scrollbar Styles */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
  background: #888;
  border-radius: var(--radius-md);
}

::-webkit-scrollbar-thumb:hover {
  background: #555;
}

/* Utility Classes */
.hidden {
  display: none !important;
}

.invisible {
  visibility: hidden;
}

.d-none {
  display: none !important;
}

.d-grid {
  display: grid;
}

.gap-2 {
  gap: 0.5rem;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: #0b5ed7;
  text-decoration: underline;
}

/* Focus Styles */
:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

button:focus,
input:focus,
select:focus,
textarea:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Text Utility Classes */
.text-danger {
  color: var(--danger) !important;
}

.text-muted {
  color: var(--text-muted) !important;
}

.fw-600 {
  font-weight: 600 !important;
}

/* Responsive Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Accessibility */
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border-width: 0 !important;
}

/* Print Styles */
@media print {
  body {
    background-color: #ffffff;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}