/* ============================================
   DTekApp WhatsApp Service - Dashboard Styles
   ============================================ */

/* CSS Variables */
:root {
  /* Colors - Light Theme (Default) */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-hover: #f1f5f9;
  
  --border-color: #e2e8f0;
  --border-light: #cbd5e1;
  
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-light: rgba(79, 70, 229, 0.1);
  
  --success: #22c55e;
  --success-light: rgba(34, 197, 94, 0.1);
  --warning: #f59e0b;
  --warning-light: rgba(245, 158, 11, 0.1);
  --error: #ef4444;
  --error-light: rgba(239, 68, 68, 0.1);
  --info: #3b82f6;
  --info-light: rgba(59, 130, 246, 0.1);
  
  /* Sizing */
  --sidebar-width: 240px;
  --sidebar-collapsed: 64px;
  --header-height: 64px;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-full: 9999px;
}

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* App Layout */
#app {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: width var(--transition-normal), transform var(--transition-normal);
}

/* Collapsed Sidebar */
.sidebar.collapsed {
  width: var(--sidebar-collapsed);
}

.sidebar.collapsed .logo-img {
  display: none;
}

.sidebar.collapsed .nav-section {
  display: none;
}

.sidebar.collapsed .nav-item {
  justify-content: center;
  padding: 12px;
}

.sidebar.collapsed .nav-item span {
  display: none;
}

.sidebar.collapsed .nav-item svg {
  margin: 0;
}

.sidebar.collapsed .sidebar-user {
  flex-direction: column;
  padding: 12px 8px;
  gap: 8px;
}

.sidebar.collapsed .user-info {
  display: none;
}

.sidebar.collapsed .user-logout {
  position: static;
}

.sidebar.collapsed .sidebar-footer {
  display: none;
}

.sidebar.collapsed .sidebar-collapse {
  margin: 0 auto;
}

.sidebar-header {
  height: var(--header-height);
  padding: 0 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
  gap: 8px;
}

.sidebar-collapse {
  padding: 8px;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.sidebar-collapse:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  gap: 4px;
}

.logo-img {
  height: 32px;
  width: auto;
}

.logo-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

.sidebar.collapsed .logo-title {
  display: none;
}

.logo-text {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.sidebar-close {
  display: none;
  padding: 8px;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.sidebar-close:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.sidebar-nav {
  flex: 1;
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.nav-item.active {
  background: rgba(79, 70, 229, 0.1);
  color: #4f46e5;
  font-weight: 600;
}

[data-theme="dark"] .nav-item.active {
  background: rgba(99, 102, 241, 0.15);
  color: #818cf8;
}

.nav-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 24px;
  background: #4f46e5;
  border-radius: 0 2px 2px 0;
}

[data-theme="dark"] .nav-item.active::before {
  background: #6366f1;
}

.nav-item svg {
  flex-shrink: 0;
}

/* Nav Section Titles */
.nav-section {
  padding: 16px 16px 8px 16px;
}

.nav-section-title {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* User Section */
.sidebar-user {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-top: 1px solid var(--border-color);
  background: var(--bg-primary);
}

.user-avatar {
  width: 36px;
  height: 36px;
  min-width: 36px;
  background: #4f46e5;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  font-size: 14px;
}

.user-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.user-info .user-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-info .user-role {
  font-size: 12px;
  color: var(--text-muted);
}

.user-logout {
  padding: 8px;
  color: var(--text-muted);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.user-logout:hover {
  background: var(--error-light);
  color: var(--error);
}

.sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.version {
  font-size: 11px;
  color: var(--text-muted);
}

/* Main Content */
.main {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: margin-left var(--transition-normal);
}

/* Main content when sidebar is collapsed */
.sidebar.collapsed ~ .main {
  margin-left: var(--sidebar-collapsed);
}

/* Header */
.header {
  position: sticky;
  top: 0;
  height: var(--header-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 50;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.sidebar-toggle {
  display: none;
}

.header-btn {
  padding: 8px;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.header-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.page-title {
  font-size: 18px;
  font-weight: 600;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 24px;
}

.health-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: var(--bg-primary);
  border-radius: var(--radius-full);
  cursor: default;
}

.health-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  animation: pulse 2s infinite;
}

.health-dot.healthy {
  background: var(--success);
}

.health-dot.unhealthy {
  background: var(--error);
}

.health-text {
  font-size: 12px;
  color: var(--text-secondary);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.user-menu {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-name {
  font-size: 14px;
  color: var(--text-secondary);
}

/* Content Area */
.content {
  flex: 1;
  padding: 24px;
  overflow-y: auto;
}

/* Card */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.card-title {
  font-size: 16px;
  font-weight: 600;
}

/* Stat Card */
.stat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.stat-value {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.stat-change {
  font-size: 12px;
  color: var(--text-secondary);
}

.stat-change.positive {
  color: var(--success);
}

.stat-change.negative {
  color: var(--error);
}

/* Grid */
.grid {
  display: grid;
  gap: 24px;
}

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

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

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* Table */
.table-container {
  overflow-x: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
}

.table th,
.table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.table th {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: var(--bg-primary);
}

.table tr:hover td {
  background: var(--bg-hover);
}

.table td {
  color: var(--text-primary);
}

/* Badge */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 500;
}

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

.badge-warning {
  background: var(--warning-light);
  color: var(--warning);
}

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

.badge-info {
  background: var(--info-light);
  color: var(--info);
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
}

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

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

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

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--border-light);
}

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

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

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

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

.btn-sm {
  padding: 6px 12px;
  font-size: 13px;
}

.btn-icon {
  padding: 8px;
}

.btn-icon.btn-sm {
  padding: 6px;
}

/* Input */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-input {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  transition: border-color var(--transition-fast);
}

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

.form-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

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

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

/* Select */
.form-select {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
}

.form-select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

/* Checkbox */
.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text-secondary);
}

.checkbox-input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
  cursor: pointer;
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 480px;
  max-height: calc(100vh - 48px);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transform: scale(0.95) translateY(10px);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 18px;
  font-weight: 600;
}

.modal-close {
  padding: 4px;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.modal-body {
  padding: 24px;
  overflow-y: auto;
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 300;
}

.toast {
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 300px;
  max-width: 400px;
  animation: slideIn var(--transition-normal);
}

.toast.hiding {
  animation: slideOut var(--transition-normal) forwards;
}

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

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

.toast-icon {
  flex-shrink: 0;
}

.toast-content {
  flex: 1;
}

.toast-title {
  font-weight: 500;
  margin-bottom: 2px;
}

.toast-message {
  font-size: 13px;
  color: var(--text-secondary);
}

.toast-close {
  padding: 4px;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
}

.toast-close:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.toast-success .toast-icon { color: var(--success); }
.toast-error .toast-icon { color: var(--error); }
.toast-warning .toast-icon { color: var(--warning); }
.toast-info .toast-icon { color: var(--info); }

/* QR Code Container */
.qr-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px;
}

.qr-code {
  width: 256px;
  height: 256px;
  background: white;
  border-radius: var(--radius-lg);
  padding: 16px;
  margin-bottom: 24px;
}

.qr-code img {
  width: 100%;
  height: 100%;
}

.qr-status {
  text-align: center;
  margin-bottom: 16px;
}

.qr-status-text {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.qr-timer {
  font-size: 13px;
  color: var(--text-muted);
}

.qr-instructions {
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  padding: 16px;
  width: 100%;
}

.qr-instructions ol {
  padding-left: 20px;
  color: var(--text-secondary);
  font-size: 13px;
}

.qr-instructions li {
  margin-bottom: 8px;
}

.qr-instructions li:last-child {
  margin-bottom: 0;
}

/* Action Buttons */
.action-buttons {
  display: flex;
  gap: 8px;
}

/* Loading Spinner */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px;
  color: var(--text-muted);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-muted);
}

.empty-state svg {
  width: 64px;
  height: 64px;
  margin-bottom: 16px;
  opacity: 0.5;
}

.empty-state-title {
  font-size: 16px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.empty-state-text {
  font-size: 14px;
  margin-bottom: 24px;
}

/* Status List */
.status-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.status-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
}

.status-item:last-child {
  border-bottom: none;
}

.status-name {
  font-size: 14px;
  color: var(--text-primary);
}

.status-value {
  font-size: 14px;
}

/* Activity List */
.activity-list {
  display: flex;
  flex-direction: column;
}

.activity-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
}

.activity-item:last-child {
  border-bottom: none;
}

.activity-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.activity-icon.success { background: var(--success-light); color: var(--success); }
.activity-icon.warning { background: var(--warning-light); color: var(--warning); }
.activity-icon.error { background: var(--error-light); color: var(--error); }
.activity-icon.info { background: var(--info-light); color: var(--info); }

.activity-content {
  flex: 1;
  min-width: 0;
}

.activity-text {
  font-size: 14px;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.activity-time {
  font-size: 12px;
  color: var(--text-muted);
}

/* Message Bubbles */
.message-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.message-group {
  margin-bottom: 24px;
}

.message-date {
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.message-bubble {
  max-width: 70%;
  padding: 12px 16px;
  border-radius: var(--radius-lg);
  position: relative;
}

.message-bubble.incoming {
  background: var(--bg-tertiary);
  margin-right: auto;
  border-bottom-left-radius: 4px;
}

.message-bubble.outgoing {
  background: var(--accent);
  margin-left: auto;
  border-bottom-right-radius: 4px;
}

.message-text {
  font-size: 14px;
  line-height: 1.5;
  word-wrap: break-word;
}

.message-meta {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
  margin-top: 4px;
}

.message-time {
  font-size: 11px;
  opacity: 0.7;
}

.message-status {
  display: flex;
  align-items: center;
}

/* Responsive */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .sidebar-close {
    display: block;
  }
  
  .main {
    margin-left: 0;
  }
  
  .sidebar-toggle {
    display: block;
  }
  
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .content {
    padding: 16px;
  }
  
  .header {
    padding: 0 16px;
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .health-text {
    display: none;
  }
  
  .user-name {
    display: none;
  }
  
  .modal {
    max-width: 100%;
    margin: 16px;
    max-height: calc(100vh - 32px);
  }
  
  .toast-container {
    left: 16px;
    right: 16px;
    bottom: 16px;
  }
  
  .toast {
    min-width: auto;
    max-width: 100%;
  }
}

/* Utility Classes */
.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-error { color: var(--error); }

.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-4 { gap: 16px; }
.gap-6 { gap: 24px; }

.hidden { display: none; }
.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ============================================
   Dark Theme
   ============================================ */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-hover: #334155;
  
  --border-color: #334155;
  --border-light: #475569;
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --accent-light: rgba(99, 102, 241, 0.15);
  
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
}

/* Theme Toggle Button */
.theme-toggle {
  padding: 8px;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.theme-toggle:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

/* ============================================
   WhatsApp Style Messages
   ============================================ */
.messages-container {
  display: flex;
  height: calc(100vh - var(--header-height) - 48px);
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
}

/* Chats Sidebar */
.chats-sidebar {
  width: 350px;
  min-width: 300px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.chats-header {
  padding: 12px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.chats-header .form-select {
  margin-bottom: 8px;
  font-size: 13px;
  padding: 8px 12px;
}

.chats-search {
  display: flex;
  align-items: center;
  background: var(--bg-tertiary);
  border-radius: var(--radius-lg);
  padding: 0 12px;
}

.chats-search svg {
  color: var(--text-muted);
  flex-shrink: 0;
}

.chats-search input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 10px 8px;
  color: var(--text-primary);
  font-size: 13px;
}

.chats-search input::placeholder {
  color: var(--text-muted);
}

.chats-search input:focus {
  outline: none;
}

.chats-list {
  flex: 1;
  overflow-y: auto;
}

.empty-chats {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: 24px;
  text-align: center;
  color: var(--text-muted);
}

.empty-chats p {
  margin-bottom: 12px;
}

.loading-chats {
  display: flex;
  justify-content: center;
  padding: 40px;
}

/* Chat Item */
.chat-item {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  cursor: pointer;
  transition: background var(--transition-fast);
  border-bottom: 1px solid var(--border-color);
}

.chat-item:hover {
  background: var(--bg-hover);
}

.chat-item.active {
  background: var(--bg-tertiary);
}

.chat-item-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 600;
  flex-shrink: 0;
  margin-right: 12px;
}

.chat-item-content {
  flex: 1;
  min-width: 0;
}

.chat-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2px;
}

.chat-item-name {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chat-item-time {
  font-size: 11px;
  color: var(--text-muted);
  flex-shrink: 0;
  margin-left: 8px;
}

.chat-item-preview {
  display: flex;
  align-items: center;
  font-size: 13px;
  color: var(--text-muted);
}

.chat-item-preview .msg-check {
  color: var(--text-muted);
  margin-right: 4px;
  font-size: 11px;
}

.preview-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Chat Main Area */
.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-primary);
  position: relative;
}

/* No Chat Selected */
.no-chat-selected {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  text-align: center;
  padding: 40px;
}

.no-chat-selected svg {
  margin-bottom: 24px;
  opacity: 0.5;
}

.no-chat-selected h3 {
  font-size: 28px;
  font-weight: 300;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.no-chat-selected p {
  font-size: 14px;
  color: var(--text-muted);
}

/* Chat Header */
.chat-header {
  display: flex;
  align-items: center;
  padding: 10px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.btn-back {
  display: none;
  padding: 8px;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  margin-right: 8px;
}

.btn-back:hover {
  background: var(--bg-hover);
}

.chat-info {
  display: flex;
  align-items: center;
  flex: 1;
}

.chat-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 600;
  margin-right: 12px;
}

.chat-details {
  display: flex;
  flex-direction: column;
}

.chat-name {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
}

.chat-status {
  font-size: 12px;
  color: var(--text-muted);
}

.chat-actions {
  display: flex;
  gap: 8px;
}

/* Chat Messages */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.messages-wrapper {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.date-separator {
  text-align: center;
  margin: 16px 0;
}

.date-separator span {
  background: var(--bg-secondary);
  padding: 6px 16px;
  border-radius: var(--radius-lg);
  font-size: 12px;
  color: var(--text-muted);
  box-shadow: var(--shadow-sm);
}

/* Message Bubbles */
.message {
  display: flex;
  margin-bottom: 2px;
}

.message.incoming {
  justify-content: flex-start;
}

.message.outgoing {
  justify-content: flex-end;
}

.message-content {
  max-width: 65%;
  padding: 8px 12px;
  border-radius: 8px;
  position: relative;
}

.message.incoming .message-content {
  background: var(--bg-secondary);
  border-top-left-radius: 0;
}

.message.outgoing .message-content {
  background: #d9fdd3;
  border-top-right-radius: 0;
}

[data-theme="dark"] .message.outgoing .message-content {
  background: #005c4b;
}

.message-text {
  font-size: 14px;
  line-height: 1.4;
  color: var(--text-primary);
  word-wrap: break-word;
  white-space: pre-wrap;
}

.message-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
  margin-top: 4px;
}

.message-time {
  font-size: 11px;
  color: var(--text-muted);
}

.message-status {
  font-size: 12px;
  color: var(--text-muted);
}

/* Chat Input */
.chat-input-container {
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

.chat-input-wrapper {
  display: flex;
  align-items: center;
  background: var(--bg-tertiary);
  border-radius: 24px;
  padding: 4px 8px;
}

.btn-emoji {
  padding: 8px;
  color: var(--text-muted);
  border-radius: 50%;
  transition: background var(--transition-fast);
}

.btn-emoji:hover {
  background: var(--bg-hover);
}

.chat-input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 10px 12px;
  font-size: 14px;
  color: var(--text-primary);
}

.chat-input::placeholder {
  color: var(--text-muted);
}

.chat-input:focus {
  outline: none;
}

.btn-send {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
}

.btn-send:hover {
  background: var(--accent-hover);
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .messages-container {
    flex-direction: column;
  }

  .chats-sidebar {
    width: 100%;
    height: 100%;
    position: absolute;
    z-index: 10;
    transform: translateX(0);
    transition: transform var(--transition-normal);
  }

  .chats-sidebar.hidden-mobile {
    transform: translateX(-100%);
  }

  .chat-main {
    width: 100%;
  }

  .btn-back {
    display: block;
  }

  .message-content {
    max-width: 85%;
  }
}