/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 1rem;
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
  text-decoration: none;
  line-height: 1;
}

.btn-primary {
  background: var(--grad-hero);
  color: #FFFFFF;
  box-shadow: 0 2px 8px rgba(255, 77, 26, 0.3);
}
.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 4px 14px rgba(255, 77, 26, 0.4);
  color: #FFFFFF;
}

.btn-secondary {
  background-color: var(--surface-2);
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover {
  background-color: var(--border);
  color: var(--text);
}

.btn-volt {
  background-color: var(--volt);
  color: var(--volt-text);
  font-weight: 800;
}
.btn-volt:hover {
  filter: brightness(1.08);
}

.btn-danger {
  background-color: var(--bad);
  color: #FFFFFF;
}
.btn-danger:hover {
  filter: brightness(1.1);
  color: #FFFFFF;
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
}
.btn-ghost:hover {
  color: var(--text);
  background-color: var(--surface-2);
}

.btn-sm {
  min-height: 34px;
  padding: 0.3rem 0.75rem;
  font-size: 0.85rem;
}

.btn-lg {
  min-height: 52px;
  padding: 0.75rem 1.75rem;
  font-size: 1.15rem;
}

.btn-icon {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: var(--radius-pill);
}

/* Cards */
.card {
  background-color: var(--surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.card-accent {
  border-top: 4px solid var(--brand);
}

.card-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-body {
  padding: 1.5rem;
  flex: 1;
}

.card-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
  background-color: var(--surface-2);
}

/* KPI Tiles */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.kpi-tile {
  background-color: var(--surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  position: relative;
  overflow: hidden;
}

.kpi-tile::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--brand);
}

.kpi-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.kpi-val {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1.1;
}

.kpi-sub {
  font-size: 0.85rem;
  color: var(--text-subtle);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  background-color: var(--surface-2);
  color: var(--text);
}

.badge-ok { background-color: var(--ok-bg); color: var(--ok); }
.badge-warn { background-color: var(--warn-bg); color: var(--warn); }
.badge-bad { background-color: var(--bad-bg); color: var(--bad); }
.badge-volt { background-color: var(--volt); color: var(--volt-text); }
.badge-brand { background-color: var(--brand); color: #FFFFFF; }

/* Tabs */
.tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 2px solid var(--border);
  overflow-x: auto;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }

.tab-item {
  font-family: var(--font-display);
  font-weight: 800;
  text-transform: uppercase;
  font-size: 1rem;
  letter-spacing: 0.05em;
  padding: 0.75rem 1.25rem;
  border-bottom: 3px solid transparent;
  color: var(--text-muted);
  cursor: pointer;
  white-space: nowrap;
  background: none;
  border-left: none;
  border-right: none;
  border-top: none;
  margin-bottom: -2px;
}

.tab-item:hover { color: var(--text); }
.tab-active {
  color: var(--brand);
  border-bottom-color: var(--brand);
}

/* Forms */
.form-group {
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  transition: border-color 0.15s ease;
}

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

.form-hint {
  font-size: 0.8rem;
  color: var(--text-subtle);
}

.form-error {
  font-size: 0.8rem;
  color: var(--bad);
  font-weight: 600;
}

/* Modals */
dialog.modal {
  border: none;
  border-radius: var(--radius-lg);
  background-color: var(--surface);
  color: var(--text);
  padding: 0;
  box-shadow: var(--shadow-lg);
  max-width: 540px;
  width: 90vw;
  margin: auto;
}

dialog.modal::backdrop {
  background: rgba(11, 15, 26, 0.7);
  backdrop-filter: blur(4px);
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-body {
  padding: 1.5rem;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

/* Toasts */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-width: 400px;
}

.toast {
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  background-color: var(--surface);
  color: var(--text);
  border-left: 4px solid var(--brand-2);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.9rem;
  animation: slideIn 0.2s ease-out;
}

.toast-ok { border-left-color: var(--ok); }
.toast-error { border-left-color: var(--bad); }

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

/* Tables */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.table th {
  background-color: var(--surface-2);
  padding: 0.75rem 1rem;
  font-family: var(--font-display);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

.table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
}

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

.table tr:hover td {
  background-color: var(--surface-2);
}

/* Skeleton Loaders */
.skeleton {
  background: linear-gradient(90deg, var(--surface-2) 25%, var(--border) 50%, var(--surface-2) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}