/* css/modern.css - Complete UI Component Library */

/* ============================================
   RESET & BASE
   ============================================ */

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

:root {
  /* Colors */
  --primary: #667eea;
  --primary-dark: #5a67d8;
  --secondary: #764ba2;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --info: #3b82f6;
  
  /* Neutrals */
  --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;
  
  /* Semantic */
  --text: #1f2937;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --bg: #f9fafb;
  --surface: #ffffff;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  
  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-md);
  color: var(--text);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: var(--space-md);
  color: var(--text-muted);
}

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

a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

/* ============================================
   FORMS
   ============================================ */

.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: var(--space-sm);
}

.form-label.required::after {
  content: '*';
  color: var(--danger);
  margin-left: 4px;
}

.form-control,
.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.625rem 0.875rem;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
  outline: none;
}

.form-control:focus,
.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-control.error,
.form-input.error {
  border-color: var(--danger);
}

.form-control.error:focus,
.form-input.error:focus {
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.form-help {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: var(--space-xs);
}

.form-error {
  display: block;
  font-size: 0.75rem;
  color: var(--danger);
  margin-top: var(--space-xs);
}

.input-group {
  display: flex;
  gap: var(--space-sm);
}

.input-group > * {
  flex: 1;
}

/* Checkbox & Radio */
.form-check {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.form-check-input {
  width: 1.125rem;
  height: 1.125rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

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

.form-check-label {
  font-size: 0.875rem;
  color: var(--text);
  cursor: pointer;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  outline: none;
}

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

/* Primary */
.btn-primary {
  color: white;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-color: transparent;
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Secondary */
.btn-secondary {
  color: var(--text);
  background: var(--surface);
  border-color: var(--border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--gray-50);
  border-color: var(--primary);
}

/* Success */
.btn-success {
  color: white;
  background: var(--success);
}

.btn-success:hover:not(:disabled) {
  background: #059669;
}

/* Danger */
.btn-danger {
  color: white;
  background: var(--danger);
}

.btn-danger:hover:not(:disabled) {
  background: #dc2626;
}

/* Outline */
.btn-outline {
  color: var(--primary);
  background: transparent;
  border-color: var(--primary);
}

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

/* Ghost */
.btn-ghost {
  color: var(--text);
  background: transparent;
  border-color: transparent;
}

.btn-ghost:hover:not(:disabled) {
  background: var(--gray-100);
}

/* Sizes */
.btn-sm {
  padding: 0.375rem 0.875rem;
  font-size: 0.75rem;
}

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: 1rem;
}

.btn-block {
  display: flex;
  width: 100%;
}

.btn-icon {
  padding: 0.625rem;
  aspect-ratio: 1;
}

/* ============================================
   TABLES
   ============================================ */

.table-container {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
}

.table thead {
  background: var(--gray-50);
}

.table th {
  padding: 0.875rem 1rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-align: left;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

.table td {
  padding: 1rem;
  font-size: 0.875rem;
  color: var(--text);
  border-bottom: 1px solid var(--border);
}

.table tbody tr:last-child td {
  border-bottom: none;
}

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

.table-striped tbody tr:nth-child(even) {
  background: var(--gray-50);
}

/* ============================================
   CARDS
   ============================================ */

.card {
  background: var(--surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: var(--transition);
}

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

.card-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
  margin: 0;
}

.card-body {
  padding: 1.5rem;
}

.card-footer {
  padding: 1.5rem;
  border-top: 1px solid var(--border);
  background: var(--gray-50);
}

/* ============================================
   BADGES
   ============================================ */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.625rem;
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1;
  border-radius: 9999px;
}

.badge-primary {
  color: var(--primary);
  background: rgba(102, 126, 234, 0.1);
}

.badge-success {
  color: var(--success);
  background: rgba(16, 185, 129, 0.1);
}

.badge-danger {
  color: var(--danger);
  background: rgba(239, 68, 68, 0.1);
}

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

.badge-info {
  color: var(--info);
  background: rgba(59, 130, 246, 0.1);
}

.badge-gray {
  color: var(--gray-600);
  background: var(--gray-100);
}

/* ============================================
   ALERTS
   ============================================ */

.alert {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  margin-bottom: var(--space-lg);
}

.alert-success {
  color: #065f46;
  background: #d1fae5;
  border-color: #6ee7b7;
}

.alert-danger {
  color: #991b1b;
  background: #fee2e2;
  border-color: #fca5a5;
}

.alert-warning {
  color: #92400e;
  background: #fef3c7;
  border-color: #fcd34d;
}

.alert-info {
  color: #1e40af;
  background: #dbeafe;
  border-color: #93c5fd;
}

/* ============================================
   MODALS
   ============================================ */

.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 10000;
  overflow: auto;
  background: rgba(0, 0, 0, 0.5);
  animation: fadeIn 0.3s;
}

.modal.show {
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-content {
  background: var(--surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 600px;
  width: 90%;
  margin: var(--space-xl);
  animation: slideUp 0.3s;
}

.modal-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.modal-close:hover {
  background: var(--gray-100);
  color: var(--text);
}

.modal-body {
  padding: 1.5rem;
}

.modal-footer {
  padding: 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  gap: var(--space-sm);
  justify-content: flex-end;
}

/* ============================================
   TABS
   ============================================ */

.tabs {
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--space-xl);
}

.tab-list {
  display: flex;
  gap: var(--space-md);
  list-style: none;
}

.tab-button {
  padding: 0.875rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition);
}

.tab-button:hover {
  color: var(--text);
}

.tab-button.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* ============================================
   LOADING
   ============================================ */

.loading {
  display: inline-block;
  width: 1.25rem;
  height: 1.25rem;
  border: 2px solid var(--gray-300);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loading-lg {
  width: 2.5rem;
  height: 2.5rem;
  border-width: 3px;
}

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
}

/* ============================================
   EMPTY STATE
   ============================================ */

.empty-state {
  padding: var(--space-2xl);
  text-align: center;
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: var(--space-lg);
  opacity: 0.5;
}

.empty-state-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-sm);
}

.empty-state-text {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
}

/* ============================================
   UTILITIES
   ============================================ */

/* Spacing */
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-xs); }
.mt-2 { margin-top: var(--space-sm); }
.mt-3 { margin-top: var(--space-md); }
.mt-4 { margin-top: var(--space-lg); }
.mt-5 { margin-top: var(--space-xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-xs); }
.mb-2 { margin-bottom: var(--space-sm); }
.mb-3 { margin-bottom: var(--space-md); }
.mb-4 { margin-bottom: var(--space-lg); }
.mb-5 { margin-bottom: var(--space-xl); }

.p-0 { padding: 0; }
.p-1 { padding: var(--space-xs); }
.p-2 { padding: var(--space-sm); }
.p-3 { padding: var(--space-md); }
.p-4 { padding: var(--space-lg); }
.p-5 { padding: var(--space-xl); }

/* Text */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.text-muted { color: var(--text-muted); }

.text-sm { font-size: 0.875rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-normal { font-weight: 400; }

/* Display */
.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

/* Flex */
.flex-column { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--space-xs); }
.gap-2 { gap: var(--space-sm); }
.gap-3 { gap: var(--space-md); }
.gap-4 { gap: var(--space-lg); }

/* Width */
.w-full { width: 100%; }
.w-auto { width: auto; }

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

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

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.75rem; }
  h3 { font-size: 1.5rem; }
  
  .btn {
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
  }
  
  .card-header,
  .card-body,
  .card-footer {
    padding: 1rem;
  }
}