/* =================================================================
   Components — Cards, buttons, chips, forms, tables, metrics, badges,
   toggle switches, tabs, modals, notifications, toasts
   ================================================================= */

/* ---- Cards ---- */
.card {
  background: var(--md-sys-color-surface-container);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  position: relative;
  transition: opacity 0.3s;
}

/* Per-card data freshness timestamp */
.card-ts {
  position: absolute;
  bottom: 0.375rem;
  right: 0.5rem;
  font-size: 0.5625rem;
  line-height: 1;
  color: var(--md-sys-color-outline);
  opacity: 0.55;
  letter-spacing: 0.01em;
  pointer-events: none;
  font-variant-numeric: tabular-nums;
}
.card-ts.stale {
  color: var(--md-sys-color-error);
  opacity: 0.8;
}
.card-ts.very-stale {
  color: var(--md-sys-color-error);
  opacity: 1;
  font-weight: 600;
}

/* Card loading shimmer */
.card-loading .value span,
.card-loading .chip,
.card-loading .status-badge {
  color: transparent !important;
  background: linear-gradient(90deg,
    var(--md-sys-color-surface-container-high) 25%,
    var(--md-sys-color-surface-container-highest) 50%,
    var(--md-sys-color-surface-container-high) 75%
  );
  background-size: 200% 100%;
  animation: card-shimmer 1.5s infinite;
  border-radius: var(--radius-xs);
  min-width: 3ch;
  display: inline-block;
}
@keyframes card-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.card-elevated {
  background: var(--md-sys-color-surface-container-low);
  box-shadow: 0 1px 3px 0 rgba(0,0,0,.3), 0 1px 2px -1px rgba(0,0,0,.3);
}

.card-outlined {
  background: var(--md-sys-color-surface);
  border: 1px solid var(--md-sys-color-outline-variant);
}

.card-body { padding: var(--space-6); }
.card h3, .card-title {
  font: var(--md-sys-typescale-title-small);
  color: var(--md-sys-color-on-surface);
  margin-bottom: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.7;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.card-lg { grid-column: span 2; }

/* Card info icon (tooltip trigger) */
.icon-btn-sm {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--md-sys-color-outline);
  border: none;
  cursor: help;
  padding: 0;
  transition: background 0.15s, color 0.15s;
}
.icon-btn-sm:hover {
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface);
}
.icon-btn-sm .material-icons-round {
  font-size: 16px;
}

.card-info-icon {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  z-index: 2;
}

/* Tooltip on hover for card-info-icon */
.card-info-icon[title] {
  position: absolute;
}
.card-info-icon[title]:hover::after {
  content: attr(title);
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: var(--space-1);
  padding: var(--space-2) var(--space-3);
  background: var(--md-sys-color-inverse-surface);
  color: var(--md-sys-color-inverse-on-surface);
  font: var(--md-sys-typescale-body-small);
  border-radius: var(--radius-sm);
  max-width: 260px;
  white-space: normal;
  z-index: 100;
  pointer-events: none;
  box-shadow: 0 2px 8px rgba(0,0,0,.3);
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.625rem 1.5rem;
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--radius-xl);
  background: transparent;
  color: var(--md-sys-color-on-surface);
  font: var(--md-sys-typescale-label-large);
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s;
  text-decoration: none;
  white-space: nowrap;
}
.btn:hover {
  background: var(--md-sys-color-surface-container-high);
}

.btn-filled, .btn-primary {
  background: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
}
.btn-filled:hover, .btn-primary:hover {
  box-shadow: 0 1px 3px rgba(0,0,0,.3);
  filter: brightness(1.08);
}

.btn-outlined {
  background: transparent;
  color: var(--md-sys-color-primary);
  border: 1px solid var(--md-sys-color-outline);
}
.btn-outlined:hover {
  background: rgba(184,196,255,.08);
}

.btn-text, .btn-secondary {
  background: transparent;
  color: var(--md-sys-color-on-surface);
  padding: 0.625rem 0.75rem;
}
.btn-secondary {
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--radius-xl);
  padding: 0.625rem 1.5rem;
}
.btn-text:hover, .btn-secondary:hover {
  background: var(--md-sys-color-surface-container-high);
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--md-sys-color-on-surface);
  border: none;
  cursor: pointer;
}
.btn-icon:hover { background: var(--md-sys-color-surface-container-high); }

.btn-full { width: 100%; }
.btn-sm { padding: 0.375rem 1rem; font-size: 0.75rem; }

/* Icon buttons in topbar */
.icon-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--md-sys-color-on-surface);
  border: none;
  cursor: pointer;
  transition: background 0.2s;
  position: relative;
}
.icon-btn:hover { background: var(--md-sys-color-surface-container-high); }

/* ---- Chips / Badges ---- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font: var(--md-sys-typescale-label-medium);
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface);
}
.chip-filled {
  background: var(--md-sys-color-surface-container-highest);
  color: var(--md-sys-color-on-surface);
}
.chip-success { background: var(--color-success-container); color: var(--color-success); }
.chip-warning { background: var(--color-warning-container); color: var(--color-warning); }
.chip-error   { background: var(--color-error-container);   color: var(--color-error); }
.chip-primary { background: var(--md-sys-color-primary-container); color: var(--md-sys-color-on-primary-container); }
.chip-default { background: var(--md-sys-color-surface-container-high); color: var(--md-sys-color-on-surface); }

/* Status badges */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font: var(--md-sys-typescale-label-medium);
  font-weight: 600;
}
.status-online    { background: var(--color-success-container); color: var(--color-success); }
.status-offline   { background: var(--color-error-container);   color: var(--color-error); }
.status-sleep     { background: var(--md-sys-color-surface-container-high); color: var(--md-sys-color-outline); }
.status-standby   { background: var(--color-warning-container); color: var(--color-warning); }
.status-charging  { background: var(--color-success-container); color: var(--color-success); }
.status-discharging { background: var(--color-warning-container); color: var(--color-warning); }
.status-idle      { background: var(--md-sys-color-surface-container-high); color: var(--md-sys-color-outline); }

/* Notification badge */
.badge {
  position: absolute;
  top: 2px;
  right: 2px;
  min-width: 16px;
  height: 16px;
  border-radius: var(--radius-full);
  background: var(--color-error);
  color: #fff;
  font-size: 10px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
}

/* ---- Metrics ---- */
.metric, .value {
  font: var(--md-sys-typescale-display-medium);
  color: var(--md-sys-color-on-surface);
}
.value-md {
  font: var(--md-sys-typescale-display-medium);
  color: var(--md-sys-color-on-surface);
}
.value-sm {
  font: var(--md-sys-typescale-headline-large);
  color: var(--md-sys-color-on-surface);
}

.metric-label, .timestamp {
  font: var(--md-sys-typescale-label-medium);
  color: var(--md-sys-color-outline);
}

.metric-unit, .unit {
  font: var(--md-sys-typescale-body-medium);
  color: var(--md-sys-color-outline);
  margin-left: 0.125em;
}

/* ---- SOC Bar ---- */
.soc-bar {
  height: 8px;
  background: var(--md-sys-color-surface-container-highest);
  border-radius: var(--radius-full);
  margin-top: var(--space-2);
  overflow: hidden;
}
.soc-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 0.5s ease;
}
.soc-low  { background: var(--color-error); }
.soc-mid  { background: var(--color-warning); }
.soc-high { background: var(--color-success); }

/* ---- Toggle Switch ---- */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
  cursor: pointer;
}
.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--md-sys-color-surface-container-highest);
  border-radius: var(--radius-full);
  transition: background 0.2s;
  border: 2px solid var(--md-sys-color-outline);
}
.toggle-slider::before {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  left: 2px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--md-sys-color-outline);
  border-radius: var(--radius-full);
  transition: transform 0.2s, background 0.2s;
}
.toggle-switch input:checked + .toggle-slider {
  background: var(--md-sys-color-primary);
  border-color: var(--md-sys-color-primary);
}
.toggle-switch input:checked + .toggle-slider::before {
  transform: translateY(-50%) translateX(20px);
  background: var(--md-sys-color-on-primary);
}

/* ---- Tabs ---- */
.tabs {
  display: flex;
  gap: var(--space-1);
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
  margin-bottom: var(--space-6);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border: none;
  background: transparent;
  color: var(--md-sys-color-outline);
  font: var(--md-sys-typescale-label-large);
  cursor: pointer;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}
.tab-btn:hover {
  color: var(--md-sys-color-on-surface);
  background: var(--md-sys-color-surface-container-high);
}
.tab-btn.active {
  color: var(--md-sys-color-primary);
  border-bottom-color: var(--md-sys-color-primary);
}

.tab-panels { position: relative; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ---- Forms ---- */
.form-group {
  margin-bottom: var(--space-4);
}

.form-label {
  display: block;
  font: var(--md-sys-typescale-label-large);
  color: var(--md-sys-color-on-surface);
  margin-bottom: var(--space-1);
}

.input, .select, input[type="text"], input[type="url"], input[type="number"],
.text-input, .number-input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  font: var(--md-sys-typescale-body-medium);
  background: var(--md-sys-color-surface-container-highest);
  color: var(--md-sys-color-on-surface);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--radius-sm);
  transition: border-color 0.2s;
}
.input:focus, .select:focus, .text-input:focus, .number-input:focus,
input[type="text"]:focus, input[type="url"]:focus, input[type="number"]:focus {
  outline: none;
  border-color: var(--md-sys-color-primary);
}
.input::placeholder, .text-input::placeholder {
  color: var(--md-sys-color-outline);
}

.number-input {
  width: 70px;
  text-align: center;
}
.text-input {
  width: 100%;
}

.input-with-unit {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.input-with-unit .unit {
  font: var(--md-sys-typescale-body-medium);
  color: var(--md-sys-color-outline);
  margin-left: 0;
}

.select {
  appearance: none;
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M2 4l4 4 4-4' fill='none' stroke='%238E9099' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 2rem;
}

.form-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.form-checkbox {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font: var(--md-sys-typescale-body-medium);
  color: var(--md-sys-color-on-surface);
  cursor: pointer;
}

/* ---- Tables ---- */
.table, .card table {
  width: 100%;
  border-collapse: collapse;
}
.table th, .card table th {
  font: var(--md-sys-typescale-label-medium);
  color: var(--md-sys-color-outline);
  text-align: left;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
  white-space: nowrap;
}
.table td, .card table td {
  font: var(--md-sys-typescale-body-medium);
  color: var(--md-sys-color-on-surface);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--md-sys-color-surface-container-highest);
}
.table tr:hover td, .card table tr:hover td {
  background: var(--md-sys-color-surface-container-low);
}

/* ---- Grid utilities ---- */
.grid   { display: grid; gap: var(--space-4); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-auto { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }

/* ---- Status indicator dot ---- */
.status-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font: var(--md-sys-typescale-label-medium);
  color: var(--md-sys-color-outline);
}
.status-indicator .dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--color-success);
}

/* ---- Alert/OK card variants ---- */
.ok-card {
  border: 1px solid color-mix(in srgb, var(--color-success) 30%, transparent);
  background: var(--color-success-container);
}
.alert-card {
  border: 1px solid color-mix(in srgb, var(--color-error) 30%, transparent);
  background: var(--color-error-container);
}

/* ---- Page header ---- */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
}
.page-header h1 {
  font: var(--md-sys-typescale-headline-large);
}

/* ---- Responsive ---- */
@media (max-width: 1023px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .card-lg { grid-column: span 1; }
}
@media (max-width: 767px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .grid-auto { grid-template-columns: 1fr; }
}