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

:root {
  /* Dark theme colors */
  --primary: #00d4ff;
  --primary-dark: #00b8e6;
  --primary-light: #33deff;
  --secondary: #a855f7;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --dark: #0a0e27;
  --darker: #050815;
  --gray: #8b92a7;
  --gray-light: #1e2442;
  --gray-dark: #13172b;
  --white: #ffffff;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --radius: 12px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #0a0e27 0%, #1a1f3a 100%);
  min-height: 100vh;
  color: var(--text);
  line-height: 1.6;
}

/* Auth Pages */
.auth-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: linear-gradient(135deg, var(--darker) 0%, var(--dark) 100%);
}

.auth-card {
  background: var(--gray-dark);
  padding: 40px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 450px;
  animation: slideUp 0.5s ease-out;
  border: 1px solid var(--gray-light);
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.auth-header {
  text-align: center;
  margin-bottom: 30px;
}

.auth-header h1 {
  color: var(--primary);
  font-size: 28px;
  margin-bottom: 8px;
  font-weight: 700;
}

.auth-header p {
  color: var(--text-muted);
  font-size: 14px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  color: var(--text);
  font-weight: 500;
  font-size: 14px;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--gray-light);
  border-radius: 8px;
  font-size: 14px;
  transition: var(--transition);
  background: var(--darker);
  color: var(--text);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.2);
}

.btn {
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: var(--darker);
  width: 100%;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

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

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

.auth-footer {
  text-align: center;
  margin-top: 20px;
  font-size: 14px;
  color: var(--text-muted);
}

.auth-footer a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
}

.auth-footer a:hover {
  text-decoration: underline;
}

.alert {
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 20px;
  font-size: 14px;
  animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.alert-success {
  background: #d1fae5;
  color: #065f46;
  border-left: 4px solid var(--success);
}

.alert-danger {
  background: #fee2e2;
  color: #991b1b;
  border-left: 4px solid var(--danger);
}

/* Dashboard Layout */
.dashboard {
  display: flex;
  min-height: 100vh;
  background: var(--dark);
}

.sidebar {
  width: 260px;
  background: var(--gray-dark);
  box-shadow: var(--shadow);
  position: fixed;
  height: 100vh;
  overflow-y: auto;
  z-index: 1000;
  transition: var(--transition);
  border-right: 1px solid var(--gray-light);
}

.sidebar-header {
  padding: 24px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--darker);
  display: flex;
  align-items: center;
  gap: 12px;
}

.sidebar-header h2 {
  font-size: 20px;
  font-weight: 700;
}

/* Icon styles */
.icon {
  width: 20px;
  height: 20px;
  display: inline-block;
  vertical-align: middle;
}

.sidebar-menu {
  padding: 16px 0;
}

.menu-item {
  display: flex;
  align-items: center;
  padding: 12px 24px;
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
  font-size: 14px;
  font-weight: 500;
  gap: 12px;
}

.menu-item:hover,
.menu-item.active {
  background: linear-gradient(90deg, rgba(0, 212, 255, 0.1) 0%, transparent 100%);
  color: var(--primary);
  border-left: 3px solid var(--primary);
}

.menu-item svg {
  margin-right: 12px;
  width: 20px;
  height: 20px;
}

.main-content {
  flex: 1;
  margin-left: 260px;
  padding: 24px;
  background: var(--dark);
}

.topbar {
  background: var(--gray-dark);
  padding: 16px 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 1px solid var(--gray-light);
}

.topbar h1 {
  font-size: 24px;
  color: var(--text);
}

/* Mobile menu button */
.mobile-menu-btn {
  display: none;
  background: var(--primary);
  color: var(--darker);
  border: none;
  padding: 10px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  transition: var(--transition);
}

.mobile-menu-btn:hover {
  background: var(--primary-light);
}

.user-menu {
  display: flex;
  align-items: center;
  gap: 16px;
}

.user-info {
  text-align: right;
}

.user-info strong {
  display: block;
  font-size: 14px;
  color: var(--text);
}

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

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--gray-dark);
  padding: 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--gray-light);
  border-left: 4px solid var(--primary);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.stat-card.success {
  border-left-color: var(--success);
}

.stat-card.warning {
  border-left-color: var(--warning);
}

.stat-card.danger {
  border-left-color: var(--danger);
}

.stat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.stat-header h3 {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
}

.stat-icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 212, 255, 0.1);
  color: var(--primary);
}

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

.card {
  background: var(--gray-dark);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 24px;
  border: 1px solid var(--gray-light);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--gray-light);
}

.card-header h2 {
  font-size: 18px;
  color: var(--text);
}

.table-responsive {
  overflow-x: auto;
}

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

thead {
  background: var(--darker);
}

th {
  padding: 12px;
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

td {
  padding: 12px;
  border-bottom: 1px solid var(--gray-light);
  font-size: 14px;
  color: var(--text-muted);
}

.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
}

.badge-success {
  background: #d1fae5;
  color: #065f46;
}

.badge-warning {
  background: #fef3c7;
  color: #92400e;
}

.badge-danger {
  background: #fee2e2;
  color: #991b1b;
}

.badge-primary {
  background: #e0e7ff;
  color: #3730a3;
}

textarea.form-control {
  min-height: 120px;
  resize: vertical;
  font-family: inherit;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.btn-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* Contact selection styles */
.contact-item {
  display: flex;
  align-items: center;
  padding: 12px;
  background: var(--darker);
  border: 2px solid var(--gray-light);
  border-radius: 8px;
  margin-bottom: 8px;
  transition: var(--transition);
  cursor: pointer;
}

.contact-item:hover {
  border-color: var(--primary);
  background: var(--gray-dark);
}

.contact-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin-right: 12px;
  cursor: pointer;
  accent-color: var(--primary);
}

.contact-item label {
  cursor: pointer;
  flex: 1;
  color: var(--text);
  margin: 0;
}

.contacts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 12px;
  max-height: 400px;
  overflow-y: auto;
  padding: 12px;
  background: var(--darker);
  border-radius: 8px;
  border: 1px solid var(--gray-light);
}

/* Balance display */
.balance-display {
  background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
  color: white;
  padding: 16px 24px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  box-shadow: var(--shadow);
  margin-bottom: 12px;
}

.balance-display .amount {
  font-size: 20px;
  font-weight: 700;
}

/* Sender name display */
.sender-display {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--darker);
  padding: 12px 20px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  box-shadow: var(--shadow);
  margin-bottom: 12px;
}

/* Info box styles */
.info-box {
  background: rgba(0, 212, 255, 0.1);
  padding: 16px;
  border-radius: 8px;
  margin-bottom: 20px;
  border-left: 4px solid var(--primary);
  color: var(--text);
}

.info-box strong {
  color: var(--primary);
}

.info-box ol,
.info-box ul {
  margin: 12px 0 0 20px;
  line-height: 1.8;
  color: var(--text-muted);
}

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

.info-box a:hover {
  text-decoration: underline;
}

/* CSV upload area */
.csv-upload-area {
  border: 2px dashed var(--gray-light);
  border-radius: 8px;
  padding: 24px;
  text-align: center;
  background: var(--darker);
  transition: var(--transition);
  cursor: pointer;
}

.csv-upload-area:hover {
  border-color: var(--primary);
  background: var(--gray-dark);
}

.csv-upload-area input[type="file"] {
  display: none;
}

/* Mobile Menu Toggle */
.mobile-toggle {
  display: none;
  background: var(--primary);
  color: var(--white);
  border: none;
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
}

/* Responsive Design */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.active {
    transform: translateX(0);
  }

  .main-content {
    margin-left: 0;
  }

  .mobile-menu-btn {
    display: block;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .auth-card {
    padding: 24px;
  }

  .topbar {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }

  .card-header {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }

  table {
    font-size: 12px;
  }

  th,
  td {
    padding: 8px;
  }

  .contacts-grid {
    grid-template-columns: 1fr;
  }

  .balance-display,
  .sender-display {
    font-size: 14px;
  }

  .balance-display .amount {
    font-size: 18px;
  }
}

@media (max-width: 480px) {
  .stat-value {
    font-size: 24px;
  }

  .topbar h1 {
    font-size: 18px;
  }
}

/* Loading Spinner */
.spinner {
  border: 3px solid var(--gray-light);
  border-top: 3px solid var(--primary);
  border-radius: 50%;
  width: 24px;
  height: 24px;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Smooth Animations */
.fade-in {
  animation: fadeIn 0.5s ease-out;
}

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