/* chckrd.io Design System - 2025 Modern UI */
/* Phase 1: Foundation CSS Framework */

/* ===== CSS CUSTOM PROPERTIES (DESIGN TOKENS) ===== */
:root {
  /* Color Palette - Light Mode */
  --color-background: #F9F9F9;
  --color-surface: #FFFFFF;
  --color-border: #E2E8F0;
  --color-text-primary: #1E293B;
  --color-text-secondary: #64748B;
  --color-primary: #007AFF;
  --color-primary-hover: #0056CC;
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  
  /* Dark Mode Colors (for future implementation) */
  --color-dark-background: #0F172A;
  --color-dark-surface: #1E293B;
  --color-dark-border: #334155;
  --color-dark-text-primary: #F1F5F9;
  --color-dark-text-secondary: #94A3B8;
  
  /* Typography Scale */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-size-h1: 32px;
  --font-size-h2: 24px;
  --font-size-h3: 20px;
  --font-size-body: 16px;
  --font-size-small: 14px;
  --font-size-caption: 12px;
  
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.2;
  --line-height-normal: 1.4;
  --line-height-relaxed: 1.5;
  
  /* Spacing Scale */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --space-16: 64px;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
  --shadow-primary: 0 4px 12px rgba(0, 122, 255, 0.3);
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.2s ease;
  --transition-slow: 0.3s ease;
}

/* ===== RESET & BASE STYLES ===== */
* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-body);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-primary);
  background-color: var(--color-background);
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-4) 0;
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-text-primary);
}

h1 {
  font-size: var(--font-size-h1);
  font-weight: var(--font-weight-bold);
}

h2 {
  font-size: var(--font-size-h2);
}

h3 {
  font-size: var(--font-size-h3);
}

p {
  margin: 0 0 var(--space-4) 0;
  color: var(--color-text-secondary);
}

/* ===== BUTTON COMPONENTS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  min-height: 44px;
  gap: var(--space-2);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background-color: var(--color-primary);
  color: white;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-primary);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-primary);
  color: white;
}

.btn-success {
  background-color: var(--color-success);
  color: white;
  box-shadow: var(--shadow-sm);
}

.btn-success:hover:not(:disabled) {
  background-color: #059669;
  transform: translateY(-1px);
}

.btn-small {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-small);
  min-height: 36px;
}

/* ===== FORM COMPONENTS ===== */
.form-group {
  margin-bottom: var(--space-4);
}

.form-label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.form-input,
.form-select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-body);
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
  min-height: 44px;
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

.form-input::placeholder {
  color: var(--color-text-secondary);
}

/* ===== CARD COMPONENTS ===== */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-header {
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.card-title {
  margin: 0;
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-semibold);
}

.card-body {
  margin-bottom: var(--space-4);
}

.card-footer {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

/* ===== STATUS BADGES ===== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-xl);
  font-size: var(--font-size-caption);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-success {
  background-color: #DCFCE7;
  color: #166534;
}

.badge-warning {
  background-color: #FEF3C7;
  color: #92400E;
}

.badge-error {
  background-color: #FEE2E2;
  color: #991B1B;
}

.badge-info {
  background-color: #DBEAFE;
  color: #1E40AF;
}

.badge-demo {
  background-color: var(--color-success);
  color: white;
  font-weight: var(--font-weight-semibold);
}

/* ===== TABLE COMPONENTS ===== */
.table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.table th,
.table td {
  padding: var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.table th {
  background-color: var(--color-background);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-small);
  color: var(--color-text-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.table tbody tr:hover {
  background-color: var(--color-background);
}

.table tbody tr:nth-child(even) {
  background-color: rgba(248, 250, 252, 0.5);
}

/* ===== UTILITY CLASSES ===== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.text-primary { color: var(--color-primary); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-error { color: var(--color-error); }
.text-secondary { color: var(--color-text-secondary); }

.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }

.mt-0 { margin-top: 0; }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }

.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }

.w-full { width: 100%; }
.h-full { height: 100%; }

.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }

/* ===== RESPONSIVE UTILITIES ===== */
@media (max-width: 768px) {
  .mobile-hidden { display: none; }
  .mobile-block { display: block; }
}

/* ===== ANIMATION UTILITIES ===== */
.fade-in {
  animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.loading {
  position: relative;
  overflow: hidden;
}

.loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0% { left: -100%; }
  100% { left: 100%; }
}