/* ==========================================================================
   UCU Components — Unified Console UI v0.1.0
   Requires tokens.css and base.css to be loaded first.
   See docs/COMPONENTS.md for usage and markup examples.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Application shell
   -------------------------------------------------------------------------- */
.ucu-app {
  display: flex;
  min-height: 100vh;
  background: var(--ucu-bg);
}

.ucu-main {
  flex: 1;
  min-width: 0;
}

.ucu-content {
  padding: var(--ucu-content-padding);
  max-width: var(--ucu-content-max-width);
  margin: 0 auto;
}

/* --------------------------------------------------------------------------
   2. Sidebar, brand block, navigation
   -------------------------------------------------------------------------- */
.ucu-sidebar {
  width: var(--ucu-sidebar-width);
  flex-shrink: 0;
  background: var(--ucu-sidebar-bg);
  border-right: 1px solid var(--ucu-border);
  display: flex;
  flex-direction: column;
  padding: var(--ucu-space-6) 0 var(--ucu-space-5);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.ucu-brand {
  display: flex;
  align-items: center;
  gap: var(--ucu-space-3);
  padding: 0 var(--ucu-space-5) var(--ucu-space-6);
  margin-bottom: var(--ucu-space-3);
  border-bottom: 1px solid var(--ucu-border);
}

.ucu-brand-mark {
  width: 34px;
  height: 34px;
  border-radius: var(--ucu-radius-md);
  background: var(--ucu-accent-soft);
  color: var(--ucu-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--ucu-fw-bold);
  font-size: var(--ucu-fs-md);
  flex-shrink: 0;
}

.ucu-brand-mark img,
.ucu-brand-mark svg {
  width: 18px;
  height: 18px;
}

.ucu-brand-text {
  min-width: 0;
}

.ucu-brand-name {
  font-size: var(--ucu-fs-sm);
  font-weight: var(--ucu-fw-semibold);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ucu-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ucu-brand-subtitle {
  font-size: var(--ucu-fs-xs);
  color: var(--ucu-text-muted);
  margin-top: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ucu-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 0 var(--ucu-space-3);
  flex: 1;
}

.ucu-nav-section-label {
  font-size: var(--ucu-fs-xs);
  font-weight: var(--ucu-fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ucu-text-faint);
  padding: var(--ucu-space-4) var(--ucu-space-3) var(--ucu-space-1);
}

.ucu-nav-item {
  display: flex;
  align-items: center;
  gap: var(--ucu-space-3);
  padding: var(--ucu-space-2) var(--ucu-space-3);
  border-radius: var(--ucu-radius-md);
  color: var(--ucu-text-muted);
  font-size: var(--ucu-fs-sm);
  font-weight: var(--ucu-fw-medium);
  cursor: pointer;
  text-decoration: none;
  border: none;
  background: transparent;
  width: 100%;
  text-align: left;
  transition: background var(--ucu-transition-fast), color var(--ucu-transition-fast);
}

.ucu-nav-item:hover {
  background: var(--ucu-surface-hover);
  color: var(--ucu-text);
}

.ucu-nav-item.is-active {
  background: var(--ucu-accent);
  color: var(--ucu-accent-contrast);
}

.ucu-nav-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ucu-nav-icon svg {
  width: 100%;
  height: 100%;
}

.ucu-sidebar-footer {
  padding: var(--ucu-space-4) var(--ucu-space-5) 0;
  margin-top: var(--ucu-space-4);
  border-top: 1px solid var(--ucu-border);
  display: flex;
  flex-direction: column;
  gap: var(--ucu-space-3);
}

.ucu-system-info {
  font-size: var(--ucu-fs-xs);
  color: var(--ucu-text-faint);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

/* Mobile nav toggle + overlay (see section 12, Responsive) */
.ucu-nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--ucu-radius-sm);
  border: 1px solid var(--ucu-border);
  background: var(--ucu-surface-alt);
  color: var(--ucu-text);
  cursor: pointer;
  margin-bottom: var(--ucu-space-4);
}

.ucu-nav-toggle:hover {
  border-color: var(--ucu-border-strong);
}

.ucu-nav-toggle svg {
  width: 18px;
  height: 18px;
}

.ucu-sidebar-overlay {
  display: none;
}

.ucu-sidebar-close {
  display: none;
}

/* --------------------------------------------------------------------------
   3. Page header
   -------------------------------------------------------------------------- */
.ucu-page-header {
  margin-bottom: var(--ucu-space-7);
}

.ucu-page-header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--ucu-space-4);
  flex-wrap: wrap;
}

.ucu-page-title {
  font-size: var(--ucu-fs-2xl);
}

.ucu-page-subtitle {
  margin-top: var(--ucu-space-2);
  font-size: var(--ucu-fs-sm);
  color: var(--ucu-text-muted);
}

.ucu-page-actions {
  display: flex;
  gap: var(--ucu-space-2);
  flex-wrap: wrap;
}

/* --------------------------------------------------------------------------
   4. Grid helpers
   -------------------------------------------------------------------------- */
.ucu-kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--ucu-space-4);
}

.ucu-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--ucu-space-4);
}

.ucu-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--ucu-space-4);
}

.ucu-stack {
  display: flex;
  flex-direction: column;
  gap: var(--ucu-space-4);
}

/* --------------------------------------------------------------------------
   5. Cards
   -------------------------------------------------------------------------- */
.ucu-card {
  background: var(--ucu-surface);
  border: 1px solid var(--ucu-border);
  border-radius: var(--ucu-radius-md);
  padding: var(--ucu-space-5);
}

.ucu-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--ucu-space-3);
  margin-bottom: var(--ucu-space-4);
}

.ucu-card-title {
  font-size: var(--ucu-fs-md);
  font-weight: var(--ucu-fw-semibold);
}

.ucu-card-subtitle {
  font-size: var(--ucu-fs-xs);
  color: var(--ucu-text-muted);
  margin-top: 2px;
}

/* --------------------------------------------------------------------------
   6. KPI / metric cards
   -------------------------------------------------------------------------- */
.ucu-kpi-card {
  background: var(--ucu-surface);
  border: 1px solid var(--ucu-border);
  border-radius: var(--ucu-radius-md);
  padding: var(--ucu-space-5);
}

.ucu-kpi-label {
  font-size: var(--ucu-fs-xs);
  font-weight: var(--ucu-fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ucu-text-muted);
}

.ucu-kpi-value {
  font-size: var(--ucu-fs-3xl);
  font-weight: var(--ucu-fw-bold);
  margin-top: var(--ucu-space-2);
  color: var(--ucu-text);
  font-variant-numeric: tabular-nums;
  line-height: var(--ucu-lh-tight);
}

.ucu-kpi-meta {
  margin-top: var(--ucu-space-2);
  font-size: var(--ucu-fs-xs);
  color: var(--ucu-text-muted);
  display: flex;
  align-items: center;
  gap: var(--ucu-space-1);
}

.ucu-kpi-meta.is-positive { color: var(--ucu-success); }
.ucu-kpi-meta.is-negative { color: var(--ucu-danger); }

/* --------------------------------------------------------------------------
   7. Tables
   -------------------------------------------------------------------------- */
.ucu-table-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--ucu-space-3);
  margin-bottom: var(--ucu-space-3);
  flex-wrap: wrap;
}

.ucu-table-toolbar-controls {
  display: flex;
  align-items: center;
  gap: var(--ucu-space-2);
  flex-wrap: wrap;
}

.ucu-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--ucu-border);
  border-radius: var(--ucu-radius-md);
  background: var(--ucu-surface);
}

.ucu-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--ucu-fs-sm);
}

.ucu-table th {
  text-align: left;
  padding: var(--ucu-space-3) var(--ucu-space-4);
  font-size: var(--ucu-fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ucu-text-muted);
  font-weight: var(--ucu-fw-semibold);
  border-bottom: 1px solid var(--ucu-border);
  white-space: nowrap;
}

.ucu-table td {
  padding: var(--ucu-space-3) var(--ucu-space-4);
  border-bottom: 1px solid var(--ucu-border);
  color: var(--ucu-text);
  vertical-align: middle;
}

.ucu-table tbody tr:last-child td {
  border-bottom: none;
}

.ucu-table tbody tr:hover {
  background: var(--ucu-surface-hover);
}

.ucu-table .ucu-table-muted {
  color: var(--ucu-text-muted);
}

/* --------------------------------------------------------------------------
   8. Buttons
   -------------------------------------------------------------------------- */
.ucu-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--ucu-space-2);
  height: var(--ucu-control-height);
  padding: 0 var(--ucu-space-4);
  border-radius: var(--ucu-radius-sm);
  border: 1px solid var(--ucu-border);
  background: var(--ucu-surface-alt);
  color: var(--ucu-text);
  font-size: var(--ucu-fs-sm);
  font-weight: var(--ucu-fw-medium);
  cursor: pointer;
  transition: background var(--ucu-transition-fast), border-color var(--ucu-transition-fast), color var(--ucu-transition-fast);
}

.ucu-btn:hover {
  background: var(--ucu-surface-hover);
  border-color: var(--ucu-border-strong);
}

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

.ucu-btn-primary {
  background: var(--ucu-accent);
  border-color: var(--ucu-accent);
  color: var(--ucu-accent-contrast);
}

.ucu-btn-primary:hover {
  background: var(--ucu-accent-hover);
  border-color: var(--ucu-accent-hover);
}

.ucu-btn-danger {
  background: transparent;
  border-color: var(--ucu-danger);
  color: var(--ucu-danger);
}

.ucu-btn-danger:hover {
  background: var(--ucu-danger-soft);
}

.ucu-btn-ghost {
  background: transparent;
  border-color: transparent;
}

.ucu-btn-ghost:hover {
  background: var(--ucu-surface-hover);
}

.ucu-btn-sm {
  height: var(--ucu-control-height-sm);
  padding: 0 var(--ucu-space-3);
  font-size: var(--ucu-fs-xs);
}

.ucu-btn-icon {
  width: var(--ucu-control-height);
  padding: 0;
}

.ucu-btn svg {
  width: 16px;
  height: 16px;
}

/* --------------------------------------------------------------------------
   9. Forms — fields, inputs, selects, search, checkbox, toggle, textarea
   -------------------------------------------------------------------------- */
.ucu-field {
  display: flex;
  flex-direction: column;
  gap: var(--ucu-space-2);
}

.ucu-label {
  font-size: var(--ucu-fs-xs);
  font-weight: var(--ucu-fw-medium);
  color: var(--ucu-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.ucu-input,
.ucu-select,
.ucu-textarea {
  height: var(--ucu-control-height);
  padding: 0 var(--ucu-space-3);
  border-radius: var(--ucu-radius-sm);
  border: 1px solid var(--ucu-border);
  background: var(--ucu-surface-alt);
  color: var(--ucu-text);
  font-size: var(--ucu-fs-sm);
  width: 100%;
  transition: border-color var(--ucu-transition-fast), box-shadow var(--ucu-transition-fast);
}

.ucu-textarea {
  height: auto;
  padding: var(--ucu-space-3);
  resize: vertical;
  min-height: 88px;
}

.ucu-input::placeholder,
.ucu-textarea::placeholder {
  color: var(--ucu-text-faint);
}

.ucu-input:focus,
.ucu-select:focus,
.ucu-textarea:focus {
  border-color: var(--ucu-accent);
  outline: none;
  box-shadow: 0 0 0 3px var(--ucu-accent-soft);
}

.ucu-input.is-error,
.ucu-select.is-error,
.ucu-textarea.is-error {
  border-color: var(--ucu-danger);
}

.ucu-field-error {
  font-size: var(--ucu-fs-xs);
  color: var(--ucu-danger);
}

.ucu-field-hint {
  font-size: var(--ucu-fs-xs);
  color: var(--ucu-text-faint);
}

.ucu-select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16' fill='none'%3E%3Cpath d='M4 6L8 10L12 6' stroke='%238b93a8' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--ucu-space-3) center;
  padding-right: var(--ucu-space-8);
}

.ucu-search {
  position: relative;
}

.ucu-search .ucu-input {
  padding-left: var(--ucu-space-8);
}

.ucu-search-icon {
  position: absolute;
  left: var(--ucu-space-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--ucu-text-faint);
  width: 16px;
  height: 16px;
  pointer-events: none;
}

.ucu-checkbox {
  display: inline-flex;
  align-items: center;
  gap: var(--ucu-space-2);
  font-size: var(--ucu-fs-sm);
  color: var(--ucu-text);
  cursor: pointer;
}

.ucu-checkbox input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--ucu-accent);
  cursor: pointer;
}

.ucu-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  width: 40px;
  height: 22px;
  flex-shrink: 0;
}

.ucu-toggle input {
  opacity: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  position: absolute;
  cursor: pointer;
  z-index: 1;
}

.ucu-toggle-track {
  position: absolute;
  inset: 0;
  background: var(--ucu-surface-alt);
  border: 1px solid var(--ucu-border);
  border-radius: var(--ucu-radius-full);
  transition: background var(--ucu-transition-fast), border-color var(--ucu-transition-fast);
}

.ucu-toggle-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ucu-text-muted);
  transition: transform var(--ucu-transition-fast), background var(--ucu-transition-fast);
}

.ucu-toggle input:checked ~ .ucu-toggle-track {
  background: var(--ucu-accent-soft);
  border-color: var(--ucu-accent);
}

.ucu-toggle input:checked ~ .ucu-toggle-thumb {
  transform: translateX(18px);
  background: var(--ucu-accent);
}

.ucu-toggle-field {
  display: flex;
  align-items: center;
  gap: var(--ucu-space-3);
  font-size: var(--ucu-fs-sm);
  color: var(--ucu-text);
}

/* --------------------------------------------------------------------------
   10. Badges & status
   -------------------------------------------------------------------------- */
.ucu-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--ucu-space-1);
  padding: 2px var(--ucu-space-2);
  border-radius: var(--ucu-radius-full);
  font-size: var(--ucu-fs-xs);
  font-weight: var(--ucu-fw-medium);
  background: var(--ucu-surface-alt);
  color: var(--ucu-text-muted);
  border: 1px solid var(--ucu-border);
  white-space: nowrap;
}

.ucu-badge-success { background: var(--ucu-success-soft); color: var(--ucu-success); border-color: transparent; }
.ucu-badge-warning { background: var(--ucu-warning-soft); color: var(--ucu-warning); border-color: transparent; }
.ucu-badge-danger  { background: var(--ucu-danger-soft);  color: var(--ucu-danger);  border-color: transparent; }
.ucu-badge-info    { background: var(--ucu-info-soft);    color: var(--ucu-info);    border-color: transparent; }

.ucu-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  background: var(--ucu-text-faint);
  flex-shrink: 0;
}

.ucu-status-dot-success { background: var(--ucu-success); }
.ucu-status-dot-warning { background: var(--ucu-warning); }
.ucu-status-dot-danger  { background: var(--ucu-danger); }
.ucu-status-dot-info    { background: var(--ucu-info); }

.ucu-status-inline {
  display: inline-flex;
  align-items: center;
  gap: var(--ucu-space-2);
  font-size: var(--ucu-fs-sm);
  color: var(--ucu-text);
}

/* --------------------------------------------------------------------------
   11. Progress bars
   -------------------------------------------------------------------------- */
.ucu-progress-label {
  display: flex;
  justify-content: space-between;
  font-size: var(--ucu-fs-xs);
  color: var(--ucu-text-muted);
  margin-bottom: var(--ucu-space-2);
}

.ucu-progress {
  height: 8px;
  border-radius: var(--ucu-radius-full);
  background: var(--ucu-surface-alt);
  border: 1px solid var(--ucu-border);
  overflow: hidden;
}

.ucu-progress-bar {
  height: 100%;
  border-radius: var(--ucu-radius-full);
  background: var(--ucu-accent);
  transition: width var(--ucu-transition-base);
}

.ucu-progress-bar.is-success { background: var(--ucu-success); }
.ucu-progress-bar.is-warning { background: var(--ucu-warning); }
.ucu-progress-bar.is-danger  { background: var(--ucu-danger); }

/* --------------------------------------------------------------------------
   12. Alerts
   -------------------------------------------------------------------------- */
.ucu-alert {
  display: flex;
  gap: var(--ucu-space-3);
  align-items: flex-start;
  padding: var(--ucu-space-4);
  border-radius: var(--ucu-radius-md);
  border: 1px solid var(--ucu-border);
  background: var(--ucu-surface-alt);
  font-size: var(--ucu-fs-sm);
}

.ucu-alert-icon {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  margin-top: 1px;
  color: var(--ucu-text-muted);
}

.ucu-alert-title {
  font-weight: var(--ucu-fw-semibold);
  margin-bottom: 2px;
  color: var(--ucu-text);
}

.ucu-alert-body {
  color: var(--ucu-text-muted);
}

.ucu-alert-success { background: var(--ucu-success-soft); border-color: transparent; }
.ucu-alert-success .ucu-alert-icon { color: var(--ucu-success); }

.ucu-alert-warning { background: var(--ucu-warning-soft); border-color: transparent; }
.ucu-alert-warning .ucu-alert-icon { color: var(--ucu-warning); }

.ucu-alert-danger { background: var(--ucu-danger-soft); border-color: transparent; }
.ucu-alert-danger .ucu-alert-icon { color: var(--ucu-danger); }

.ucu-alert-info { background: var(--ucu-info-soft); border-color: transparent; }
.ucu-alert-info .ucu-alert-icon { color: var(--ucu-info); }

/* --------------------------------------------------------------------------
   13. Chart containers
   -------------------------------------------------------------------------- */
.ucu-chart-card {
  background: var(--ucu-surface);
  border: 1px solid var(--ucu-border);
  border-radius: var(--ucu-radius-md);
  padding: var(--ucu-space-5);
}

.ucu-chart-placeholder {
  height: 220px;
  border-radius: var(--ucu-radius-sm);
  background: var(--ucu-surface-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ucu-text-faint);
  font-size: var(--ucu-fs-sm);
  border: 1px dashed var(--ucu-border-strong);
  text-align: center;
  padding: var(--ucu-space-4);
}

.ucu-chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--ucu-space-4);
  margin-top: var(--ucu-space-4);
}

.ucu-chart-legend-item {
  display: flex;
  align-items: center;
  gap: var(--ucu-space-2);
  font-size: var(--ucu-fs-xs);
  color: var(--ucu-text-muted);
}

.ucu-chart-legend-swatch {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   14. Theme toggle
   -------------------------------------------------------------------------- */
.ucu-theme-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--ucu-space-2);
  padding: var(--ucu-space-2) var(--ucu-space-3);
  border-radius: var(--ucu-radius-sm);
  border: 1px solid var(--ucu-border);
  background: var(--ucu-surface-alt);
  color: var(--ucu-text-muted);
  font-size: var(--ucu-fs-xs);
  cursor: pointer;
  width: 100%;
}

.ucu-theme-toggle:hover {
  color: var(--ucu-text);
  border-color: var(--ucu-border-strong);
}

.ucu-theme-toggle svg {
  width: 14px;
  height: 14px;
}

/* --------------------------------------------------------------------------
   15. Responsive behavior
   docs/RESPONSIVE.md documents these breakpoints and rationale.
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .ucu-sidebar {
    position: fixed;
    left: 0;
    top: 0;
    transform: translateX(-100%);
    transition: transform var(--ucu-transition-base);
    z-index: 50;
    box-shadow: var(--ucu-shadow-md);
  }

  .ucu-app.is-nav-open .ucu-sidebar {
    transform: translateX(0);
  }

  .ucu-app.is-nav-open .ucu-sidebar-overlay {
    display: block;
    position: fixed;
    inset: 0;
    background: var(--ucu-overlay);
    z-index: 40;
  }

  .ucu-nav-toggle {
    display: inline-flex;
  }

  .ucu-sidebar-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: var(--ucu-radius-sm);
    border: 1px solid var(--ucu-border);
    background: transparent;
    color: var(--ucu-text-muted);
    cursor: pointer;
    margin-left: auto;
  }

  .ucu-sidebar-close svg {
    width: 14px;
    height: 14px;
  }

  .ucu-content {
    padding: var(--ucu-space-5);
  }

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

  .ucu-grid-2,
  .ucu-grid-3 {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 1025px) {
  .ucu-sidebar-overlay {
    display: none !important;
  }
}

@media (max-width: 640px) {
  .ucu-kpi-grid {
    grid-template-columns: 1fr;
  }

  .ucu-content {
    padding: var(--ucu-space-4);
  }

  .ucu-page-title {
    font-size: var(--ucu-fs-xl);
  }

  .ucu-table-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .ucu-table-toolbar-controls {
    flex-direction: column;
    align-items: stretch;
  }
}