:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --border: #30363d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --success: #3fb950;
  --danger: #f85149;
  --danger-hover: #da3633;
  --warning: #d29922;
  --radius: 6px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
}

/* Login page */
.login-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

.login-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  width: 100%;
  max-width: 360px;
}

.login-box h1 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 24px;
  text-align: center;
  color: var(--text-primary);
}

.login-box .subtitle {
  text-align: center;
  color: var(--text-secondary);
  margin-top: -16px;
  margin-bottom: 24px;
  font-size: 14px;
}

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

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.form-group input {
  width: 100%;
  padding: 8px 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s;
  text-decoration: none;
  gap: 6px;
}

.btn-primary {
  background: #238636;
  border-color: rgba(240, 246, 252, 0.1);
  color: #fff;
  width: 100%;
}

.btn-primary:hover {
  background: #2ea043;
}

.btn-sm {
  padding: 4px 10px;
  font-size: 12px;
}

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

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

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

.btn-danger:hover {
  background: var(--danger);
  color: #fff;
  border-color: var(--danger);
}

.error-msg {
  color: var(--danger);
  font-size: 13px;
  margin-top: 8px;
  display: none;
}

.error-msg.visible {
  display: block;
}

/* Dashboard */
.dashboard {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.header h1 {
  font-size: 20px;
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Stats cards */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}

.stat-card .label {
  font-size: 12px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-card .value {
  font-size: 24px;
  font-weight: 600;
  margin-top: 4px;
}

.stat-card .value.online {
  color: var(--success);
}

/* Add client section */
.add-client {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 24px;
}

.add-client h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 12px;
}

.add-form {
  display: flex;
  gap: 8px;
  align-items: flex-end;
}

.add-form .form-group {
  margin-bottom: 0;
  flex: 1;
  max-width: 300px;
}

.add-form .form-group label {
  font-size: 12px;
}

.add-result {
  margin-top: 16px;
  padding: 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: none;
}

.add-result.visible {
  display: block;
}

.add-result .config-text {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 12px;
  white-space: pre-wrap;
  word-break: break-all;
  margin-top: 8px;
  color: var(--text-primary);
}

.add-result .qr-img {
  margin-top: 12px;
  text-align: center;
}

.add-result .qr-img img {
  border-radius: var(--radius);
  background: #fff;
  padding: 8px;
}

/* Clients table */
.clients-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.clients-section h2 {
  font-size: 16px;
  font-weight: 600;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

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

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

th {
  text-align: left;
  padding: 10px 16px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

td {
  padding: 10px 16px;
  font-size: 14px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

tr:last-child td {
  border-bottom: none;
}

tr:hover td {
  background: rgba(177, 186, 196, 0.04);
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 6px;
}

.status-dot.online {
  background: var(--success);
  box-shadow: 0 0 4px var(--success);
}

.status-dot.offline {
  background: var(--text-muted);
}

.actions {
  display: flex;
  gap: 6px;
}

.no-clients {
  padding: 40px 20px;
  text-align: center;
  color: var(--text-secondary);
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal-overlay.visible {
  display: flex;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  max-width: 400px;
  width: 90%;
  text-align: center;
}

.modal h3 {
  margin-bottom: 12px;
}

.modal p {
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-size: 14px;
}

.modal-actions {
  display: flex;
  gap: 8px;
  justify-content: center;
}

/* QR Modal */
.qr-modal {
  max-width: 360px;
}

.qr-modal img {
  background: #fff;
  padding: 8px;
  border-radius: var(--radius);
}

/* Responsive */
@media (max-width: 768px) {
  .dashboard {
    padding: 16px;
  }

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

  .add-form {
    flex-direction: column;
    align-items: stretch;
  }

  .add-form .form-group {
    max-width: 100%;
  }

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