:root {
  --color-bg: #F5F5F5;
  --color-surface: #FFFFFF;
  --color-border: #E0E0E0;
  --color-primary: #2C3E50;
  --color-primary-hover: #34495E;
  --color-accent: #3498DB;
  --color-text: #1A1A1A;
  --color-text-muted: #666666;
  --color-success: #27AE60;
  --color-danger: #E74C3C;
  --color-sidebar: #2C3E50;
  --color-sidebar-text: #ECF0F1;
  --color-sidebar-active: #3498DB;
  --radius: 6px;
  --sidebar-width: 220px;
}

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

html,
body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 14px;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.5;
}

h1, h2, h3, p {
  margin: 0;
}

/* Login */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
}

.login-card {
  width: 380px;
  max-width: calc(100% - 32px);
  padding: 40px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.login-title {
  font-size: 1.35rem;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.login-subtitle {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-bottom: 24px;
}

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

.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--color-sidebar);
  color: var(--color-sidebar-text);
  display: flex;
  flex-direction: column;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-logo {
  font-size: 1.25rem;
}

.sidebar-title {
  font-weight: 600;
  font-size: 0.9rem;
  line-height: 1.3;
}

.sidebar-nav {
  padding: 12px 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 12px 16px;
  border: none;
  background: transparent;
  color: var(--color-sidebar-text);
  font: inherit;
  text-align: left;
  cursor: pointer;
  border-left: 3px solid transparent;
}

.nav-item:hover {
  background: rgba(255, 255, 255, 0.06);
}

.nav-item.active {
  background: rgba(52, 152, 219, 0.15);
  border-left-color: var(--color-sidebar-active);
  color: #fff;
}

.nav-icon {
  font-size: 1rem;
  width: 20px;
  text-align: center;
}

.main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

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

.breadcrumb {
  font-weight: 600;
  color: var(--color-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.user-label {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

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

.view-panel[hidden] {
  display: none !important;
}

.view-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  gap: 16px;
  flex-wrap: wrap;
}

.view-title {
  font-size: 1.15rem;
  color: var(--color-primary);
}

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

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

.form-group input,
.form-group select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font: inherit;
  background: var(--color-surface);
}

.form-group input:focus,
.form-group select:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 0;
  border-color: var(--color-accent);
}

.form-hint {
  display: block;
  margin-top: 4px;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.form-error {
  margin-top: 12px;
  color: var(--color-danger);
  font-size: 0.875rem;
}

.form-message {
  margin-bottom: 12px;
  font-size: 0.875rem;
}

.form-message.is-error {
  color: var(--color-danger);
}

.form-message.is-success {
  color: var(--color-success);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font: inherit;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

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

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

.btn-secondary {
  background: var(--color-surface);
  border-color: var(--color-border);
  color: var(--color-text);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--color-bg);
}

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

.btn-ghost:hover:not(:disabled) {
  background: var(--color-bg);
}

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: 6px 10px;
  font-size: 0.8125rem;
}

.btn-icon {
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 4px 8px;
  font-size: 1rem;
  color: var(--color-accent);
  border-radius: var(--radius);
}

.btn-icon:hover {
  background: var(--color-bg);
}

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

/* Table */
.table-wrap {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: auto;
}

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

.data-table th,
.data-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.data-table th {
  background: var(--color-bg);
  font-weight: 600;
  color: var(--color-primary);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.data-table tbody tr:hover {
  background: #fafafa;
}

.data-table tfoot td {
  border-bottom: none;
}

.table-total-row {
  background: #EEEEEE;
}

.actions-cell {
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 4px;
}

.empty-state {
  text-align: center;
  color: var(--color-text-muted);
  padding: 32px;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal[hidden] {
  display: none !important;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
}

.modal-card {
  position: relative;
  width: 480px;
  max-width: calc(100% - 32px);
  max-height: calc(100vh - 32px);
  overflow: auto;
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.modal-card h3 {
  margin-bottom: 20px;
  color: var(--color-primary);
}

.modal-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.modal-actions-right {
  display: flex;
  gap: 8px;
}

/* Filters & report */
.filters-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 24px;
}

.filters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
  align-items: end;
}

.form-group-action .btn {
  width: 100%;
}

.summary-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
}

.summary-label {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-bottom: 8px;
}

.summary-value {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.summary-period {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* Loading & alerts */
[hidden] {
  display: none !important;
}

.loading-state:not([hidden]) {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 24px;
  color: var(--color-text-muted);
}

.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.alert:not([hidden]) {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 14px 16px;
  border-radius: var(--radius);
  margin-bottom: 16px;
}

.alert-error {
  background: #FDEDEC;
  border: 1px solid #F5B7B1;
  color: var(--color-danger);
}

.alert-icon {
  font-size: 1.1rem;
  line-height: 1;
}

#query-results {
  margin-top: 8px;
}