/* SAFRU Payroll App - Modern Design System */

/* === DESIGN TOKENS === */
:root {
  /* Colors */
  --safru-primary: #1e40af;
  --safru-primary-light: #3b82f6;
  --safru-primary-dark: #1e3a8a;
  --safru-secondary: #059669;
  --safru-secondary-light: #10b981;
  --safru-accent: #f59e0b;
  --safru-accent-light: #fbbf24;
  
  /* Grays */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  
  /* Status Colors */
  --success: #059669;
  --warning: #f59e0b;
  --error: #dc2626;
  --info: #0ea5e9;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Radius */
  --radius-sm: 0.375rem;
  --radius: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  
  /* Transitions */
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  background: linear-gradient(135deg, var(--gray-50) 0%, #ffffff 100%);
  color: var(--gray-800);
  line-height: 1.6;
  min-height: 100vh;
}

/* === LAYOUT COMPONENTS === */

/* Header */
.safru-header {
  background: linear-gradient(135deg, var(--safru-primary) 0%, var(--safru-primary-dark) 100%);
  color: white;
  padding: var(--space-4) 0;
  box-shadow: var(--shadow-lg);
  position: sticky;
  top: 0;
  z-index: 50;
}

.safru-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.safru-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 1.5rem;
  font-weight: 700;
  text-decoration: none;
  color: white;
}

.safru-logo img {
  height: 40px;
  width: auto;
}

.safru-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.safru-nav a {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  transition: var(--transition);
  font-weight: 500;
}

.safru-nav a:hover {
  color: white;
}

/* Cards */
.safru-card {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-100);
  overflow: hidden;
  transition: var(--transition);
}

.safru-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.safru-card-header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--gray-100);
  background: var(--gray-50);
}

.safru-card-body {
  padding: var(--space-6);
}

.safru-card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-900);
  margin: 0;
}

.safru-card-subtitle {
  color: var(--gray-600);
  margin: var(--space-2) 0 0 0;
  font-size: 0.875rem;
}

/* Buttons */
.safru-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border: none;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.safru-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.safru-btn-primary {
  background: linear-gradient(135deg, var(--safru-primary) 0%, var(--safru-primary-light) 100%);
  color: white;
}

.safru-btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--safru-primary-dark) 0%, var(--safru-primary) 100%);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.safru-btn-success {
  background: linear-gradient(135deg, var(--safru-secondary) 0%, var(--safru-secondary-light) 100%);
  color: white;
}

.safru-btn-success:hover:not(:disabled) {
  background: linear-gradient(135deg, #047857 0%, var(--safru-secondary) 100%);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.safru-btn-outline {
  background: white;
  border: 2px solid var(--safru-primary);
  color: var(--safru-primary);
}

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

.safru-btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: 1rem;
}

.safru-btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: 0.75rem;
}

/* Forms */
.safru-form-group {
  margin-bottom: var(--space-6);
}

.safru-label {
  display: block;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: var(--space-2);
  font-size: 0.875rem;
}

.safru-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: 1rem;
  transition: var(--transition);
  background: white;
}

.safru-input:focus {
  outline: none;
  border-color: var(--safru-primary);
  box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

.safru-input:invalid {
  border-color: var(--error);
}

/* File Upload */
.safru-file-upload {
  border: 2px dashed var(--gray-300);
  border-radius: var(--radius-lg);
  padding: var(--space-16);
  text-align: center;
  background: var(--gray-50);
  transition: var(--transition);
  cursor: pointer;
  position: relative;
}

.safru-file-upload:hover {
  border-color: var(--safru-primary);
  background: rgba(30, 64, 175, 0.02);
}

.safru-file-upload.dragover {
  border-color: var(--safru-primary);
  background: rgba(30, 64, 175, 0.05);
}

.safru-file-upload input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.safru-file-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-4);
  color: var(--gray-400);
}

/* Tables */
.safru-table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.safru-table th {
  background: var(--gray-50);
  padding: var(--space-4);
  text-align: left;
  font-weight: 600;
  color: var(--gray-700);
  font-size: 0.875rem;
  border-bottom: 1px solid var(--gray-200);
}

.safru-table td {
  padding: var(--space-4);
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-700);
}

.safru-table tr:hover {
  background: var(--gray-50);
}

/* Badges */
.safru-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.safru-badge-success {
  background: rgba(5, 150, 105, 0.1);
  color: var(--success);
}

.safru-badge-error {
  background: rgba(220, 38, 38, 0.1);
  color: var(--error);
}

.safru-badge-warning {
  background: rgba(245, 158, 11, 0.1);
  color: var(--warning);
}

/* Alerts */
.safru-alert {
  padding: var(--space-4);
  border-radius: var(--radius);
  font-weight: 500;
  margin-bottom: var(--space-4);
}

.safru-alert-success {
  background: rgba(5, 150, 105, 0.1);
  color: var(--success);
  border-left: 4px solid var(--success);
}

.safru-alert-error {
  background: rgba(220, 38, 38, 0.1);
  color: var(--error);
  border-left: 4px solid var(--error);
}

.safru-alert-warning {
  background: rgba(245, 158, 11, 0.1);
  color: var(--warning);
  border-left: 4px solid var(--warning);
}

.safru-alert-info {
  background: rgba(14, 165, 233, 0.1);
  color: var(--info);
  border-left: 4px solid var(--info);
}

/* Loading States */
.safru-spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top: 2px solid currentColor;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.safru-loading {
  opacity: 0.6;
  pointer-events: none;
}

/* Utilities */
.text-center { text-align: center; }
.text-right { text-align: right; }
.w-full { width: 100%; }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.p-6 { padding: var(--space-6); }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-4 { gap: var(--space-4); }

/* Responsive */
@media (max-width: 768px) {
  .safru-header .container {
    padding: 0 var(--space-4);
  }
  
  .safru-nav {
    gap: var(--space-4);
  }
  
  .safru-card-body {
    padding: var(--space-4);
  }
  
  .safru-file-upload {
    padding: var(--space-8);
  }
}

/* Import Inter font */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');