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

:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --bg: #0f172a;
  --bg-card: #1e293b;
  --bg-input: #334155;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --border: #334155;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* Auth Pages */
.auth-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 1rem;
}

.auth-card {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 2.5rem;
  width: 100%;
  max-width: 420px;
  border: 1px solid var(--border);
}

.auth-card h1 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.auth-card .subtitle {
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.logo {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), #a855f7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1.5rem;
  display: block;
}

/* Password toggle */
.input-password {
  position: relative;
}

.input-password input {
  padding-right: 3rem;
}

.btn-eye {
  position: absolute;
  right: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
  display: flex;
  align-items: center;
}

.btn-eye:hover {
  color: var(--text);
}

/* Forms */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
}

.form-group input, .form-group select {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 1rem;
  transition: border-color 0.2s;
}

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

.btn {
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  border: none;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-primary {
  background: var(--primary);
  color: white;
  width: 100%;
  justify-content: center;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

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

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

.btn-sm {
  padding: 0.5rem 0.75rem;
  font-size: 0.8rem;
}

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

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.link {
  color: var(--primary);
  text-decoration: none;
  font-size: 0.875rem;
}

.link:hover {
  text-decoration: underline;
}

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

.mt-1 { margin-top: 1rem; }

.alert {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  font-size: 0.875rem;
}

.alert-error {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.alert-success {
  background: rgba(34, 197, 94, 0.15);
  color: var(--success);
  border: 1px solid rgba(34, 197, 94, 0.3);
}

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

.sidebar {
  width: 260px;
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
}

.sidebar .logo {
  font-size: 1.5rem;
  margin-bottom: 2rem;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  margin-bottom: 0.25rem;
  cursor: pointer;
  transition: all 0.2s;
}

.nav-item:hover, .nav-item.active {
  background: rgba(99, 102, 241, 0.1);
  color: var(--primary);
}

.nav-spacer {
  flex: 1;
}

.main {
  flex: 1;
  padding: 2rem;
  overflow-y: auto;
}

.main h2 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
}

.stat-card .label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat-card .value {
  font-size: 2rem;
  font-weight: 700;
  margin-top: 0.25rem;
}

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

/* Client Cards */
.client-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.client-status {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.client-status.online { background: var(--success); box-shadow: 0 0 8px var(--success); }
.client-status.offline { background: var(--text-muted); }

.client-info {
  flex: 1;
}

.client-info h3 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.client-info .meta {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.client-actions {
  display: flex;
  gap: 0.5rem;
}

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

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

th, td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-success { background: rgba(34, 197, 94, 0.15); color: var(--success); }
.badge-danger { background: rgba(239, 68, 68, 0.15); color: var(--danger); }
.badge-warning { background: rgba(245, 158, 11, 0.15); color: var(--warning); }

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}

.modal {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 2rem;
  width: 100%;
  max-width: 480px;
  border: 1px solid var(--border);
}

.modal h3 {
  margin-bottom: 1.5rem;
}

.qr-container {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  justify-content: center;
  margin: 1rem 0;
}

.qr-container svg {
  width: 250px;
  height: 250px;
}

/* Plan info */
.plan-banner {
  background: linear-gradient(135deg, var(--primary), #a855f7);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.plan-banner .plan-name {
  font-size: 1.1rem;
  font-weight: 700;
  text-transform: capitalize;
}

.plan-banner .plan-meta {
  font-size: 0.85rem;
  opacity: 0.85;
}

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

  .sidebar {
    width: 100%;
    flex-direction: row;
    overflow-x: auto;
    padding: 1rem;
    gap: 0.25rem;
  }

  .sidebar .logo {
    margin-bottom: 0;
    margin-right: 1rem;
  }

  .nav-spacer { display: none; }

  .main {
    padding: 1rem;
  }

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

  .client-card {
    flex-wrap: wrap;
  }

  .client-actions {
    width: 100%;
    justify-content: flex-end;
  }
}

/* Hidden */
.hidden { display: none !important; }