/* CSS Variables */
:root {
  --primary-color: #1976d2;
  --primary-light: #42a5f5;
  --primary-dark: #1565c0;
  --secondary-color: #9c27b0;
  --success-color: #4caf50;
  --warning-color: #ff9800;
  --error-color: #f44336;
  --info-color: #2196f3;
  --grey-50: #fafafa;
  --grey-100: #f5f5f5;
  --grey-200: #eeeeee;
  --grey-300: #e0e0e0;
  --grey-400: #bdbdbd;
  --grey-500: #9e9e9e;
  --grey-600: #757575;
  --grey-700: #616161;
  --grey-800: #424242;
  --grey-900: #212121;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);

  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  line-height: 1.6;
  color: var(--grey-900);
  background-color: var(--grey-50);
  min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }

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

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

a:hover {
  text-decoration: underline;
}

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

.container-narrow {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

/* Cards */
.card {
  background: white;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--grey-200);
  overflow: hidden;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.card-hover:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  cursor: pointer;
}

.card-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--grey-200);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.card-body {
  padding: var(--spacing-lg);
}

.card-footer {
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--grey-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0;
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
  color: var(--grey-800);
}

.form-label-required::after {
  content: " *";
  color: var(--error-color);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--grey-300);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: inherit;
  background: white;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(25, 118, 210, 0.1);
}

.form-input:disabled,
.form-textarea:disabled,
.form-select:disabled {
  background-color: var(--grey-100);
  cursor: not-allowed;
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-hint {
  font-size: 0.875rem;
  color: var(--grey-600);
  margin-top: var(--spacing-xs);
}

.form-error {
  font-size: 0.875rem;
  color: var(--error-color);
  margin-top: var(--spacing-xs);
}

.field-description {
  font-size: 0.875rem;
  color: var(--grey-600);
  margin-bottom: var(--spacing-sm);
  white-space: pre-line;
}

.form-description {
  white-space: pre-line;
  line-height: 1.6;
}

/* Radio & Checkbox groups */
.radio-group,
.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.radio-item,
.checkbox-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
}

.radio-item input,
.checkbox-item input {
  width: 1.25rem;
  height: 1.25rem;
  cursor: pointer;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: 1rem;
  font-weight: 500;
  font-family: inherit;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none;
}

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

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

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

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

.btn-secondary:hover:not(:disabled) {
  background-color: rgba(66, 66, 66, 0.05);
}

.btn-text {
  background-color: transparent;
  color: var(--primary-color);
  padding: var(--spacing-sm);
}

.btn-text:hover:not(:disabled) {
  background-color: rgba(25, 118, 210, 0.1);
}

.btn-error {
  background-color: transparent;
  color: var(--error-color);
}

.btn-error:hover:not(:disabled) {
  background-color: rgba(244, 67, 54, 0.1);
}

.btn-block {
  width: 100%;
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1.125rem;
}

/* Alerts */
.alert {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.alert-error {
  background-color: rgba(244, 67, 54, 0.1);
  border: 1px solid rgba(244, 67, 54, 0.2);
  color: #c62828;
}

.alert-success {
  background-color: rgba(76, 175, 80, 0.1);
  border: 1px solid rgba(76, 175, 80, 0.2);
  color: #2e7d32;
}

.alert-warning {
  background-color: rgba(255, 152, 0, 0.1);
  border: 1px solid rgba(255, 152, 0, 0.2);
  color: #ef6c00;
}

.alert-info {
  background-color: rgba(33, 150, 243, 0.1);
  border: 1px solid rgba(33, 150, 243, 0.2);
  color: #1565c0;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.025em;
  border-radius: var(--radius-sm);
}

.badge-open {
  background-color: rgba(76, 175, 80, 0.15);
  color: #2e7d32;
}

.badge-in_progress {
  background-color: rgba(255, 152, 0, 0.15);
  color: #ef6c00;
}

.badge-resolved {
  background-color: rgba(33, 150, 243, 0.15);
  color: #1565c0;
}

.badge-closed {
  background-color: rgba(158, 158, 158, 0.15);
  color: var(--grey-700);
}

.badge-customer_reply {
  background-color: rgba(156, 39, 176, 0.15);
  color: #7b1fa2;
}

.badge-operator_reply {
  background-color: rgba(63, 81, 181, 0.15);
  color: #303f9f;
}

/* Navigation */
.navbar {
  background: white;
  border-bottom: 1px solid var(--grey-200);
  padding: var(--spacing-md) 0;
  margin-bottom: var(--spacing-xl);
}

.navbar-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--grey-900);
}

.navbar-nav {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.navbar-nav a {
  color: var(--grey-700);
  font-weight: 500;
}

.navbar-nav a:hover {
  color: var(--primary-color);
}

/* Page Header */
.page-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  padding: var(--spacing-xl) 0;
}

.page-header h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

.page-header p {
  font-size: 1.125rem;
  color: var(--grey-600);
  max-width: 600px;
  margin: 0 auto;
  white-space: pre-line;
}

/* Grid */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }

@media (max-width: 1024px) {
  .grid-cols-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .grid-cols-2,
  .grid-cols-3 { grid-template-columns: 1fr; }
}

/* Ticket Grid */
.ticket-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

/* Response Timeline */
.timeline {
  position: relative;
  padding-left: var(--spacing-xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--grey-300);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-lg);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -22px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--primary-color);
  border: 2px solid white;
  box-shadow: 0 0 0 2px var(--primary-color);
}

.timeline-item.customer::before {
  background: var(--primary-color);
  box-shadow: 0 0 0 2px var(--primary-color);
}

.timeline-item.operator::before {
  background: var(--success-color);
  box-shadow: 0 0 0 2px var(--success-color);
}

.timeline-content {
  background: white;
  border: 1px solid var(--grey-200);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
}

.timeline-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-sm);
}

.timeline-author {
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.timeline-time {
  font-size: 0.875rem;
  color: var(--grey-500);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--spacing-2xl);
  background: white;
  border: 2px dashed var(--grey-300);
  border-radius: var(--radius-lg);
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-md);
  color: var(--grey-400);
}

.empty-state h3 {
  color: var(--grey-700);
  margin-bottom: var(--spacing-sm);
}

.empty-state p {
  color: var(--grey-600);
  margin-bottom: var(--spacing-lg);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--spacing-lg);
}

.modal {
  background: white;
  border-radius: var(--radius-lg);
  max-width: 400px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  animation: modal-in 0.2s ease;
}

@keyframes modal-in {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.modal-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--grey-200);
}

.modal-body {
  padding: var(--spacing-lg);
}

.modal-footer {
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--grey-200);
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-sm);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: 1100;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.toast {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  color: white;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  animation: toast-in 0.3s ease;
  min-width: 250px;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.toast-success {
  background: var(--success-color);
}

.toast-error {
  background: var(--error-color);
}

/* Loading */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl);
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--grey-200);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

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

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

.text-grey { color: var(--grey-600); }
.text-muted { color: var(--grey-500); }

.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

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

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.ml-1 { margin-left: var(--spacing-xs); }
.ml-2 { margin-left: var(--spacing-sm); }
.ml-auto { margin-left: auto; }

.mr-1 { margin-right: var(--spacing-xs); }
.mr-2 { margin-right: var(--spacing-sm); }

.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--spacing-sm); }
.gap-3 { gap: var(--spacing-md); }

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

.hidden { display: none; }

/* Icons */
.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  flex-shrink: 0;
}

.icon-lg {
  width: 2rem;
  height: 2rem;
}

.icon-xl {
  width: 3rem;
  height: 3rem;
}

/* Chips */
.chip {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.75rem;
  background: var(--grey-100);
  border-radius: 9999px;
  margin-right: var(--spacing-xs);
  margin-bottom: var(--spacing-xs);
}

/* Divider */
.divider {
  height: 1px;
  background: var(--grey-200);
  margin: var(--spacing-md) 0;
}

/* Back Button */
.back-button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--grey-600);
  margin-bottom: var(--spacing-md);
  font-size: 0.875rem;
}

.back-button:hover {
  color: var(--primary-color);
}

/* Responsive */
@media (max-width: 768px) {
  .container,
  .container-narrow {
    padding: var(--spacing-md);
  }

  .page-header h1 {
    font-size: 1.75rem;
  }

  .navbar-content {
    flex-direction: column;
    gap: var(--spacing-md);
  }
}