:root {
  --primary: #25D366;
  --primary-dark: #128C7E;
  --secondary: #34B7F1;
  --bg-dark: #1a1a2e;
  --bg-card: #16213e;
  --bg-hover: #0f3460;
  --text-primary: #ffffff;
  --text-secondary: #a0a0a0;
  --border-color: #2d3748;
  --success: #25D366;
  --warning: #ffc107;
  --danger: #dc3545;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
}

/* Login Screen */
.login-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-card) 100%);
  padding: 20px;
}

.login-box {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 40px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  border: 1px solid var(--border-color);
}

.login-logo {
  text-align: center;
  margin-bottom: 30px;
}

.logo-icon {
  font-size: 48px;
  margin-bottom: 10px;
}

.login-logo h1 {
  font-size: 28px;
  color: var(--primary);
  margin-bottom: 5px;
}

.login-logo p {
  color: var(--text-secondary);
  font-size: 14px;
}

/* Form Styles */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--text-secondary);
}

.input-group {
  position: relative;
  display: flex;
  align-items: center;
}

.input-group i {
  position: absolute;
  left: 12px;
  color: var(--text-secondary);
}

.input-group input {
  width: 100%;
  padding: 12px 12px 12px 40px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-dark);
  color: var(--text-primary);
  font-size: 14px;
  transition: all 0.3s;
}

.input-group input:focus {
  outline: none;
  border-color: var(--primary);
}

/* Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s;
}

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

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(37, 211, 102, 0.4);
}

.btn-block {
  width: 100%;
}

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

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

/* Sidebar */
.sidebar {
  width: 260px;
  background: var(--bg-card);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  position: fixed;
  height: 100vh;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--border-color);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  font-size: 24px;
}

.logo-text {
  font-size: 20px;
  font-weight: 600;
  color: var(--primary);
}

.sidebar-nav {
  flex: 1;
  padding: 20px 0;
}

.sidebar-nav ul {
  list-style: none;
}

.nav-item {
  margin: 4px 12px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 8px;
  transition: all 0.3s;
}

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

.sidebar-footer {
  padding: 20px;
  border-top: 1px solid var(--border-color);
}

/* Main Content */
.main-content {
  flex: 1;
  margin-left: 260px;
  display: flex;
  flex-direction: column;
}

.top-bar {
  height: 64px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  position: sticky;
  top: 0;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
}

.content-area {
  flex: 1;
  padding: 24px;
  overflow-y: auto;
}

/* Page Management */
.page {
  display: none;
}

.page.active {
  display: block;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

.stat-card {
  background: var(--bg-card);
  border-radius: 12px;
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  border: 1px solid var(--border-color);
}

.stat-icon {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  background: rgba(37, 211, 102, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--primary);
}

.stat-info h3 {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 4px;
}

.stat-info p {
  color: var(--text-secondary);
  font-size: 14px;
}

/* Table Styles */
.table-container {
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  overflow: hidden;
}

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

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

.data-table th {
  background: var(--bg-hover);
  font-weight: 500;
  color: var(--text-secondary);
}

.data-table tr:hover {
  background: rgba(255,255,255,0.02);
}

.text-center {
  text-align: center;
}

/* Page Header */
.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

/* Screen Management */
.screen {
  display: none;
}

.screen.active {
  display: block;
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    width: 100%;
    position: relative;
    height: auto;
  }
  
  .main-content {
    margin-left: 0;
  }
  
  .app-container {
    flex-direction: column;
  }
}

/* Status Badges */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
}

.status-connected {
  background: rgba(37, 211, 102, 0.15);
  color: #25d366;
}

.status-disconnected {
  background: rgba(220, 53, 69, 0.15);
  color: #dc3545;
}

.status-warning {
  background: rgba(255, 193, 7, 0.15);
  color: #ffc107;
}

.whatsapp-section {
  background: var(--bg-card);
  padding: 24px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  margin-bottom: 24px;
}

.button-group {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}

#qr-code-container {
  background: white;
  padding: 20px;
  border-radius: 12px;
}