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

:root {
  --bg: #F7F8F9;
  --surface: #ffffff;
  --border: #E6E8ED;
  --text: #1A1A1F;
  --text-secondary: #6B7380;
  --text-tertiary: #9EA6B0;
  --primary: #5EC3AE;
  --primary-hover: #459485;
  --primary-light: #E8F8F4;
  --danger: #EF4545;
  --danger-hover: #d63030;
  --success: #10BA82;
  --warning: #F59E0B;
  --radius: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow: 0 2px 8px rgba(0,0,0,0.06);
}

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

.hidden { display: none !important; }

/* Login */
.login-container {
  max-width: 380px;
  margin: 120px auto;
  padding: 40px;
  background: var(--surface);
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.login-header {
  text-align: center;
  margin-bottom: 32px;
}

.login-logo {
  height: 40px;
  width: auto;
}

.login-header h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary);
}

.login-header p {
  color: var(--text-secondary);
  margin-top: 4px;
}

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

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

input[type="email"],
input[type="password"],
input[type="text"],
select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s;
}

input:focus, select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(94, 195, 174, 0.15);
}

.error-text {
  color: var(--danger);
  font-size: 13px;
  margin-top: 12px;
  text-align: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
}

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

.btn-primary {
  background: var(--primary);
  color: #fff;
}

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

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

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

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

.btn-ghost:hover {
  background: var(--primary-light);
  color: var(--primary-hover);
}

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

.btn-outline:hover:not(:disabled) {
  background: var(--primary);
  color: #fff;
}

.btn-block {
  width: 100%;
  justify-content: center;
  padding: 12px;
}

.btn-sm {
  padding: 5px 10px;
  font-size: 13px;
}

/* Navbar */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 56px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.nav-brand {
  display: flex;
  align-items: center;
}

.nav-logo {
  height: 28px;
  width: auto;
}

/* Content */
.content {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px;
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  font-size: 14px;
  color: var(--text-secondary);
}

.breadcrumb .crumb {
  cursor: pointer;
}

.breadcrumb .crumb:hover {
  color: var(--primary);
}

.breadcrumb .crumb.active {
  color: var(--text);
  font-weight: 500;
}

.breadcrumb .separator {
  color: var(--border);
}

/* Panel */
.panel {
  background: var(--surface);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 24px;
}

.panel-header {
  margin-bottom: 20px;
}

.panel-header h2 {
  font-size: 20px;
  font-weight: 600;
}

.panel-header .subtitle {
  color: var(--text-secondary);
  font-size: 14px;
  margin-top: 2px;
}

/* Card Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.site-card {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.site-card:hover {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(94, 195, 174, 0.15);
}

.site-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 4px;
}

.site-card-header h3 {
  font-size: 16px;
  font-weight: 600;
}

.site-card-actions {
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity 0.15s;
}

.site-card:hover .site-card-actions {
  opacity: 1;
}

.site-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.site-card p {
  font-size: 13px;
  color: var(--text-secondary);
}

/* Add card */
.add-card {
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px dashed var(--border);
  background: transparent;
  min-height: 88px;
}

.add-card:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.add-card-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
}

.add-icon {
  font-size: 24px;
  line-height: 1;
  color: var(--primary);
}

/* Table header actions */
.table-header-actions {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 12px;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}

.tab {
  padding: 10px 20px;
  border: none;
  background: none;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 0.15s, border-color 0.15s;
}

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

.tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

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

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

th, td {
  text-align: left;
  padding: 10px 12px;
  font-size: 14px;
  border-bottom: 1px solid var(--border);
}

th {
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  background: var(--bg);
}

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

tr:hover td {
  background: var(--primary-light);
}

/* Status badges */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}

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

.badge-warning {
  background: #fef3c7;
  color: var(--warning);
}

.badge-danger {
  background: #fee2e2;
  color: var(--danger);
}

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

.badge-offline {
  background: #fee2e2;
  color: var(--danger);
}

.badge-muted {
  background: #f3f4f6;
  color: var(--text-tertiary);
}

.status-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  margin-right: 4px;
  vertical-align: middle;
}

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

.dot-offline {
  background: var(--danger);
}

/* Reader detail */
.detail-grid {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 12px 16px;
  margin-bottom: 24px;
}

.detail-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

.detail-value {
  font-size: 14px;
  word-break: break-all;
}

.detail-actions {
  display: flex;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-secondary);
}

.empty-state p {
  font-size: 14px;
}

/* Loading */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
  color: var(--text-secondary);
  font-size: 14px;
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.modal {
  background: var(--surface);
  border-radius: 12px;
  padding: 24px;
  max-width: 500px;
  width: 90%;
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

.modal h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

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

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

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  padding: 12px 20px;
  background: var(--text);
  color: #fff;
  border-radius: var(--radius);
  font-size: 14px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  z-index: 200;
  animation: slideIn 0.2s ease-out;
}

.toast.error {
  background: var(--danger);
}

.toast.success {
  background: var(--success);
}

@keyframes slideIn {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* Logs list */
.logs-list {
  max-height: 400px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.log-entry {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
}

.log-entry-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.log-time {
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
}

.log-entry-detail {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* Current user indicator in navbar */
.nav-user {
  color: var(--text-secondary);
  font-size: 13px;
  margin-right: 8px;
  align-self: center;
}