/* Modern Document Management System - Enhanced Design */

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary: #64748b;
  --success: #10b981;
  --danger: #ef4444;
  --light: #f8fafc;
  --dark: #0f172a;
  --border: #e2e8f0;
  --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-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --radius: 0.75rem;
  --radius-sm: 0.5rem;
}

/* Base Styles */
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  background-attachment: fixed;
  min-height: 100vh;
}

.container {
  max-width: 1200px;
}

/* Navbar Enhancement */
.navbar {
  background: rgba(255, 255, 255, 0.95) !important;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.navbar-brand {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--primary) !important;
  letter-spacing: -0.025em;
}

.navbar-dark .navbar-brand {
  color: var(--primary) !important;
}

.navbar-dark .navbar-nav .nav-link {
  color: var(--secondary) !important;
  font-weight: 500;
  transition: color 0.2s;
}

.navbar-dark .navbar-nav .nav-link:hover {
  color: var(--primary) !important;
}

.navbar-text {
  color: var(--dark) !important;
  font-weight: 500;
}

#darkToggle {
  font-size: 1.25rem;
  cursor: pointer;
  transition: transform 0.2s;
}

#darkToggle:hover {
  transform: scale(1.1);
}

/* Card Enhancements */
.card {
  border: none;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  background: white;
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

.card-header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border: none;
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 1.25rem 1.5rem;
}

.card-header h5 {
  color: white;
  font-weight: 600;
  font-size: 1.125rem;
  letter-spacing: -0.025em;
}

.card-body {
  padding: 1.5rem;
}

/* Form Controls */
.form-label {
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.form-control,
.form-select {
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.625rem 0.875rem;
  transition: all 0.2s;
  font-size: 0.9375rem;
}

.form-control:focus,
.form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

textarea.form-control {
  resize: vertical;
}

/* Buttons */
.btn {
  border-radius: var(--radius-sm);
  font-weight: 600;
  padding: 0.625rem 1.25rem;
  transition: all 0.2s;
  text-transform: uppercase;
  font-size: 0.875rem;
  letter-spacing: 0.025em;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  box-shadow: var(--shadow);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
  background: var(--primary-dark);
}

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

.btn-success:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
  background: #059669;
}

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

.btn-outline-primary:hover {
  background: var(--primary);
  border-color: var(--primary);
  transform: translateY(-1px);
}

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

.btn-outline-secondary:hover {
  background: var(--light);
  border-color: var(--secondary);
}

.btn-sm {
  padding: 0.375rem 0.875rem;
  font-size: 0.8125rem;
}

/* Radio Buttons */
.form-check-input {
  width: 1.25rem;
  height: 1.25rem;
  margin-top: 0;
  cursor: pointer;
  border: 2px solid var(--border);
}

.form-check-input:checked {
  background-color: var(--primary);
  border-color: var(--primary);
}

.form-check-label {
  cursor: pointer;
  font-weight: 500;
  margin-left: 0.5rem;
}

/* Document List Items */
.border-bottom {
  border-color: var(--border) !important;
  transition: background 0.2s;
  padding: 1.25rem 0 !important;
}

.border-bottom:hover {
  background: var(--light);
  margin: 0 -1.5rem;
  padding: 1.25rem 1.5rem !important;
  border-radius: var(--radius-sm);
}

.border-bottom h5 {
  color: var(--dark);
  font-weight: 700;
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

.border-bottom p {
  color: var(--secondary);
  line-height: 1.6;
}

.text-muted {
  color: var(--secondary) !important;
  font-size: 0.875rem;
}

.text-muted strong {
  color: var(--dark);
  font-weight: 600;
}

.text-danger {
  color: var(--danger) !important;
  text-decoration: none;
  font-weight: 600;
  transition: opacity 0.2s;
}

.text-danger:hover {
  opacity: 0.8;
}

/* Toast Notifications */
.toast {
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  border: none;
}

.toast-body {
  font-weight: 500;
}

/* Empty State */
.text-center.text-muted {
  font-size: 1rem;
  color: var(--secondary) !important;
}

/* Spacing Utilities */
.mt-4 {
  margin-top: 2rem !important;
}

.mb-4 {
  margin-bottom: 2rem !important;
}

.py-3 {
  padding-top: 1.25rem !important;
  padding-bottom: 1.25rem !important;
}

/* Dark Mode */
.dark {
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
}

.dark .card {
  background: #1e293b;
  box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.3);
}

.dark .card-body {
  color: #e2e8f0;
}

.dark .form-control,
.dark .form-select {
  background: #0f172a;
  border-color: #334155;
  color: #e2e8f0;
}

.dark .form-control:focus,
.dark .form-select:focus {
  background: #0f172a;
  border-color: var(--primary);
  color: #e2e8f0;
}

.dark .form-label {
  color: #e2e8f0;
}

.dark .border-bottom h5 {
  color: #f1f5f9;
}

.dark .border-bottom p {
  color: #cbd5e1;
}

.dark .text-muted {
  color: #94a3b8 !important;
}

.dark .text-muted strong {
  color: #e2e8f0;
}

.dark .border-bottom {
  border-color: #334155 !important;
}

.dark .border-bottom:hover {
  background: rgba(51, 65, 85, 0.3);
}

.dark .navbar {
  background: rgba(30, 41, 59, 0.95) !important;
  border-bottom-color: #334155;
}

.dark .navbar-brand {
  color: #60a5fa !important;
}

.dark .navbar-dark .navbar-nav .nav-link {
  color: #cbd5e1 !important;
}

.dark .navbar-dark .navbar-nav .nav-link:hover {
  color: #60a5fa !important;
}

.dark .navbar-text {
  color: #e2e8f0 !important;
}

.dark .btn-outline-secondary {
  background: #0f172a;
  border-color: #334155;
  color: #cbd5e1;
}

.dark .btn-outline-secondary:hover {
  background: #1e293b;
  border-color: #475569;
  color: #e2e8f0;
}

/* Responsive Design */
@media (max-width: 768px) {
  .card-body {
    padding: 1rem;
  }
  
  .card-header {
    padding: 1rem;
  }
  
  .btn {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
  }
  
  .border-bottom:hover {
    margin: 0;
    padding: 1.25rem 0 !important;
  }
}

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

.card {
  animation: fadeIn 0.3s ease-out;
}

/* File Input Enhancement */
input[type="file"] {
  cursor: pointer;
}

input[type="file"]::file-selector-button {
  background: var(--primary);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  margin-right: 1rem;
  transition: all 0.2s;
}

input[type="file"]::file-selector-button:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.dark input[type="file"]::file-selector-button {
  background: var(--primary);
}

/* Link Styling */
a {
  text-decoration: none;
}

a:hover {
  text-decoration: none;
}

/* Badge-like tags display */
.small.text-muted span {
  display: inline-block;
  padding: 0.25rem 0;
}