/* ==========================================================================
   BioTrack Pro — Components
   Buttons, cards, badges, modals, toasts, tabs, dropdowns, timelines,
   skeletons, empty states, alerts, avatars, tooltips, progress.
   ========================================================================== */

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 36px;
  padding: 0 var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: var(--text-md);
  font-weight: var(--weight-medium);
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
  transition: var(--transition-colors), var(--transition-shadow);
  position: relative;
}

.btn:disabled,
.btn.is-disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

.btn:focus-visible {
  box-shadow: var(--shadow-focus);
  outline: none;
}

/* --- Variants --- */

.btn--primary {
  background: var(--color-primary);
  color: var(--color-on-primary);
  box-shadow: var(--shadow-xs);
}

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

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

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

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

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

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

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

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

.btn--danger:hover { filter: brightness(0.92); }

.btn--danger-soft {
  background: var(--color-danger-bg);
  color: var(--color-danger);
  border-color: var(--color-danger-br);
}

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

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

.btn--success:hover { filter: brightness(0.92); }

.btn--link {
  background: none;
  color: var(--color-primary);
  height: auto;
  padding: 0;
  font-weight: var(--weight-medium);
}

.btn--link:hover { text-decoration: underline; text-underline-offset: 2px; }

/* --- Sizes --- */

.btn--sm {
  height: 30px;
  padding: 0 var(--space-3);
  font-size: var(--text-sm);
  gap: var(--space-1);
}

.btn--lg {
  height: 42px;
  padding: 0 var(--space-5);
  font-size: var(--text-base);
}

.btn--block { width: 100%; }

/* --- Icon button --- */

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  border: 1px solid transparent;
  transition: var(--transition-colors);
  position: relative;
  flex-shrink: 0;
}

.icon-btn:hover {
  background: var(--color-surface-hover);
  color: var(--color-text-strong);
}

.icon-btn:focus-visible { box-shadow: var(--shadow-focus); }

.icon-btn--sm { width: 28px; height: 28px; }
.icon-btn--bordered { border-color: var(--color-border); }
.icon-btn--danger:hover { background: var(--color-danger-bg); color: var(--color-danger); }
.icon-btn.is-active { background: var(--color-primary-soft); color: var(--color-primary); }

.icon-btn__dot {
  position: absolute;
  top: 5px;
  right: 5px;
  min-width: 15px;
  height: 15px;
  padding: 0 3px;
  border-radius: var(--radius-full);
  background: var(--color-danger);
  color: #fff;
  font-size: 9px;
  font-weight: var(--weight-bold);
  display: grid;
  place-items: center;
  line-height: 1;
  border: 2px solid var(--color-surface);
  box-sizing: content-box;
}

/* --- Button group --- */

.btn-group {
  display: inline-flex;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border-strong);
  background: var(--color-surface);
}

.btn-group .btn {
  border-radius: 0;
  border: none;
  border-right: 1px solid var(--color-border);
  box-shadow: none;
  height: 34px;
}

.btn-group .btn:last-child { border-right: none; }
.btn-group .btn.is-active {
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-weight: var(--weight-semibold);
}

/* --- Loading state --- */

.btn.is-loading {
  color: transparent !important;
  pointer-events: none;
}

.btn.is-loading::after {
  content: "";
  position: absolute;
  width: 15px;
  height: 15px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  color: var(--color-on-primary);
}

.btn--secondary.is-loading::after,
.btn--ghost.is-loading::after { color: var(--color-text); }

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

/* --- Keyboard hint --- */

.kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 5px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--color-border);
  border-bottom-width: 2px;
  background: var(--color-surface-sunk);
  font-family: var(--font-sans);
  font-size: var(--text-2xs);
  font-weight: var(--weight-semibold);
  color: var(--color-text-muted);
  line-height: 1;
}

/* ==========================================================================
   Cards
   ========================================================================== */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  overflow: hidden;
}

.card--flat { box-shadow: none; }
.card--sunk { background: var(--color-surface-sunk); }

.card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.card__title {
  font-size: var(--text-md);
  font-weight: var(--weight-semibold);
  color: var(--color-text-strong);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.card__subtitle {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
  font-weight: var(--weight-regular);
}

.card__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

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

.card__body--flush { padding: 0; }
.card__body--tight { padding: var(--space-4); }

.card__footer {
  padding: var(--space-3) var(--space-5);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-sunk);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* ==========================================================================
   Stat cards
   ========================================================================== */

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(215px, 1fr));
  gap: var(--space-4);
}

.stat {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  position: relative;
  transition: var(--transition-colors), var(--transition-shadow), transform var(--duration-fast) var(--ease-out);
  text-align: left;
  width: 100%;
  box-shadow: var(--shadow-xs);
}

button.stat { cursor: pointer; }

button.stat:hover {
  border-color: var(--color-primary-border);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

button.stat:focus-visible {
  box-shadow: var(--shadow-focus);
  outline: none;
}

.stat__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-2);
}

.stat__label {
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--color-text-muted);
  line-height: var(--leading-snug);
}

.stat__icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  flex-shrink: 0;
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.stat__icon--success { background: var(--color-success-bg); color: var(--color-success); }
.stat__icon--warning { background: var(--color-warning-bg); color: var(--color-warning); }
.stat__icon--danger  { background: var(--color-danger-bg);  color: var(--color-danger); }
.stat__icon--info    { background: var(--color-info-bg);    color: var(--color-info); }
.stat__icon--purple  { background: var(--color-purple-bg);  color: var(--color-purple); }
.stat__icon--neutral { background: var(--color-neutral-bg); color: var(--color-neutral-fg); }
.stat__icon--critical{ background: var(--color-critical-bg);color: var(--color-critical); }

.stat__value {
  font-size: var(--text-3xl);
  font-weight: var(--weight-semibold);
  color: var(--color-text-strong);
  line-height: 1;
  letter-spacing: var(--tracking-tight);
  font-variant-numeric: tabular-nums;
}

.stat__value--sm { font-size: var(--text-2xl); }

.stat__foot {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  min-height: 18px;
}

.stat__delta {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  font-weight: var(--weight-semibold);
}

.stat__delta--up   { color: var(--color-success); }
.stat__delta--down { color: var(--color-danger); }
.stat__delta--flat { color: var(--color-text-muted); }

/* ==========================================================================
   Badges
   ========================================================================== */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  font-size: var(--text-2xs);
  font-weight: var(--weight-semibold);
  line-height: 1.5;
  white-space: nowrap;
  border: 1px solid transparent;
  letter-spacing: 0.01em;
}

.badge__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  flex-shrink: 0;
}

.badge--neutral { background: var(--color-neutral-bg);  color: var(--color-neutral-fg); }
.badge--primary { background: var(--color-primary-soft); color: var(--color-primary); border-color: var(--color-primary-border); }
.badge--success { background: var(--color-success-bg);  color: var(--color-success);  border-color: var(--color-success-br); }
.badge--warning { background: var(--color-warning-bg);  color: var(--color-warning);  border-color: var(--color-warning-br); }
.badge--danger  { background: var(--color-danger-bg);   color: var(--color-danger);   border-color: var(--color-danger-br); }
.badge--info    { background: var(--color-info-bg);     color: var(--color-info);     border-color: var(--color-info-br); }
.badge--purple  { background: var(--color-purple-bg);   color: var(--color-purple); }
.badge--critical{ background: var(--color-critical-bg); color: var(--color-critical); border-color: var(--color-critical); font-weight: var(--weight-bold); }

.badge--lg {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
}

.badge--outline {
  background: transparent;
  border-color: currentColor;
}

/* Priority pills */
.badge--stat-priority { text-transform: uppercase; letter-spacing: var(--tracking-wide); }

/* ==========================================================================
   Avatar
   ========================================================================== */

.avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  display: grid;
  place-items: center;
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  flex-shrink: 0;
  overflow: hidden;
  user-select: none;
  letter-spacing: 0.02em;
}

.avatar img { width: 100%; height: 100%; object-fit: cover; }

.avatar--sm { width: 26px; height: 26px; font-size: var(--text-2xs); }
.avatar--lg { width: 44px; height: 44px; font-size: var(--text-md); }
.avatar--xl { width: 64px; height: 64px; font-size: var(--text-xl); }

.avatar--square { border-radius: var(--radius-md); }

/* Deterministic tone variants, assigned by hash — see utils/strings.js */
.avatar--t1 { background: var(--color-primary-soft); color: var(--color-primary); }
.avatar--t2 { background: var(--color-success-bg);   color: var(--color-success); }
.avatar--t3 { background: var(--color-warning-bg);   color: var(--color-warning); }
.avatar--t4 { background: var(--color-purple-bg);    color: var(--color-purple); }
.avatar--t5 { background: var(--color-info-bg);      color: var(--color-info); }
.avatar--t6 { background: var(--color-danger-bg);    color: var(--color-danger); }

/* ==========================================================================
   Alerts
   ========================================================================== */

.alert {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid;
  font-size: var(--text-sm);
  line-height: var(--leading-snug);
  align-items: flex-start;
}

.alert__icon { flex-shrink: 0; margin-top: 1px; }
.alert__body { flex: 1; min-width: 0; }
.alert__title { font-weight: var(--weight-semibold); margin-bottom: 2px; }
.alert__actions { margin-top: var(--space-2); display: flex; gap: var(--space-2); }

.alert--info    { background: var(--color-info-bg);     border-color: var(--color-info-br);     color: var(--color-info); }
.alert--success { background: var(--color-success-bg);  border-color: var(--color-success-br);  color: var(--color-success); }
.alert--warning { background: var(--color-warning-bg);  border-color: var(--color-warning-br);  color: var(--color-warning); }
.alert--danger  { background: var(--color-danger-bg);   border-color: var(--color-danger-br);   color: var(--color-danger); }
.alert--critical{ background: var(--color-critical-bg); border-color: var(--color-critical);    color: var(--color-critical); }
.alert--neutral { background: var(--color-surface-sunk);border-color: var(--color-border);      color: var(--color-text); }

/* ==========================================================================
   Modal
   ========================================================================== */

.modal-root {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: none;
}

.modal-root.is-open { display: block; }

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: var(--color-overlay);
  animation: fade-in var(--duration-fast) var(--ease-out);
}

.modal__wrap {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  overflow-y: auto;
  pointer-events: none;
}

.modal {
  position: relative;
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 520px;
  max-height: calc(100vh - var(--space-12));
  display: flex;
  flex-direction: column;
  pointer-events: auto;
  animation: modal-in var(--duration-base) var(--ease-out);
  margin: auto;
}

.modal--sm { max-width: 420px; }
.modal--lg { max-width: 720px; }
.modal--xl { max-width: 980px; }
.modal--full { max-width: 1240px; }

@keyframes modal-in {
  from { opacity: 0; transform: translateY(8px) scale(0.985); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.modal__header {
  flex-shrink: 0;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-5) var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.modal__title {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  color: var(--color-text-strong);
  line-height: var(--leading-snug);
}

.modal__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

.modal__body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-5);
}

.modal__body--flush { padding: 0; }

.modal__footer {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-sunk);
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  flex-wrap: wrap;
}

.modal__footer--between { justify-content: space-between; }

/* Confirm dialog icon */
.confirm__icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.confirm__icon--danger  { background: var(--color-danger-bg);  color: var(--color-danger); }
.confirm__icon--warning { background: var(--color-warning-bg); color: var(--color-warning); }
.confirm__icon--info    { background: var(--color-info-bg);    color: var(--color-info); }
.confirm__icon--success { background: var(--color-success-bg); color: var(--color-success); }

/* ==========================================================================
   Toast
   ========================================================================== */

.toast-root {
  position: fixed;
  top: var(--space-4);
  right: var(--space-4);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  pointer-events: none;
  max-width: min(400px, calc(100vw - var(--space-8)));
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-info);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  animation: toast-in var(--duration-base) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.toast.is-leaving {
  animation: toast-out var(--duration-fast) var(--ease-in-out) forwards;
}

@keyframes toast-in {
  from { opacity: 0; transform: translateX(16px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes toast-out {
  to { opacity: 0; transform: translateX(16px); }
}

.toast__icon { flex-shrink: 0; margin-top: 1px; }
.toast__body { flex: 1; min-width: 0; }

.toast__title {
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-text-strong);
  line-height: var(--leading-snug);
}

.toast__msg {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: 2px;
  line-height: var(--leading-snug);
  word-break: break-word;
}

.toast__action {
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-primary);
}

.toast__action:hover { text-decoration: underline; }

.toast__close {
  flex-shrink: 0;
  color: var(--color-text-subtle);
  padding: 2px;
  border-radius: var(--radius-xs);
  transition: var(--transition-colors);
}

.toast__close:hover { color: var(--color-text); background: var(--color-surface-hover); }

.toast--success { border-left-color: var(--color-success); }
.toast--success .toast__icon { color: var(--color-success); }
.toast--warning { border-left-color: var(--color-warning); }
.toast--warning .toast__icon { color: var(--color-warning); }
.toast--danger  { border-left-color: var(--color-danger); }
.toast--danger  .toast__icon { color: var(--color-danger); }
.toast--info    { border-left-color: var(--color-info); }
.toast--info    .toast__icon { color: var(--color-info); }
.toast--critical{ border-left-color: var(--color-critical); border-color: var(--color-critical); }
.toast--critical .toast__icon { color: var(--color-critical); }

/* ==========================================================================
   Tabs
   ========================================================================== */

.tabs {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  border-bottom: 1px solid var(--color-border);
  overflow-x: auto;
  scrollbar-width: none;
}

.tabs::-webkit-scrollbar { display: none; }

.tab {
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-md);
  font-weight: var(--weight-medium);
  color: var(--color-text-muted);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  white-space: nowrap;
  transition: var(--transition-colors);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

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

.tab[aria-selected="true"] {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  font-weight: var(--weight-semibold);
}

.tab__count {
  min-width: 20px;
  height: 18px;
  padding: 0 5px;
  border-radius: var(--radius-full);
  background: var(--color-neutral-bg);
  color: var(--color-neutral-fg);
  font-size: var(--text-2xs);
  font-weight: var(--weight-semibold);
  display: grid;
  place-items: center;
  line-height: 1;
}

.tab[aria-selected="true"] .tab__count {
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.tabs--pills {
  border-bottom: none;
  gap: var(--space-1);
  background: var(--color-surface-sunk);
  padding: var(--space-1);
  border-radius: var(--radius-md);
  display: inline-flex;
}

.tabs--pills .tab {
  border-bottom: none;
  margin-bottom: 0;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
}

.tabs--pills .tab[aria-selected="true"] {
  background: var(--color-surface);
  color: var(--color-text-strong);
  box-shadow: var(--shadow-xs);
}

.tab-panel { padding-top: var(--space-5); }
.tab-panel[hidden] { display: none; }

/* ==========================================================================
   Dropdown
   ========================================================================== */

.dropdown {
  position: fixed;
  min-width: 200px;
  max-width: 320px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-1);
  z-index: var(--z-dropdown);
  animation: dropdown-in var(--duration-fast) var(--ease-out);
  max-height: 400px;
  overflow-y: auto;
}

@keyframes dropdown-in {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.dropdown__item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--color-text);
  text-align: left;
  transition: var(--transition-colors);
  white-space: nowrap;
}

.dropdown__item:hover:not(:disabled),
.dropdown__item.is-highlighted {
  background: var(--color-surface-hover);
  color: var(--color-text-strong);
}

.dropdown__item:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.dropdown__item .icon { color: var(--color-text-muted); }
.dropdown__item:hover .icon { color: var(--color-text); }

.dropdown__item--danger { color: var(--color-danger); }
.dropdown__item--danger .icon { color: var(--color-danger); }
.dropdown__item--danger:hover:not(:disabled) { background: var(--color-danger-bg); color: var(--color-danger); }

.dropdown__label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
}

.dropdown__hint {
  flex-shrink: 0;
  font-size: var(--text-2xs);
  color: var(--color-text-subtle);
}

.dropdown__divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-1) 0;
}

.dropdown__header {
  padding: var(--space-2) var(--space-3) var(--space-1);
  font-size: var(--text-2xs);
  font-weight: var(--weight-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-caps);
  color: var(--color-text-subtle);
}

/* Profile dropdown card */
.dropdown__profile {
  padding: var(--space-3);
  display: flex;
  gap: var(--space-3);
  align-items: center;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-1);
}

/* ==========================================================================
   Empty state
   ========================================================================== */

.empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-12) var(--space-6);
  gap: var(--space-2);
}

.empty--sm { padding: var(--space-8) var(--space-4); }

.empty__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-full);
  background: var(--color-surface-sunk);
  border: 1px solid var(--color-border);
  display: grid;
  place-items: center;
  color: var(--color-text-subtle);
  margin-bottom: var(--space-2);
}

.empty__title {
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  color: var(--color-text-strong);
}

.empty__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 46ch;
  line-height: var(--leading-relaxed);
}

.empty__actions {
  margin-top: var(--space-3);
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  justify-content: center;
}

/* ==========================================================================
   Skeleton
   ========================================================================== */

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-surface-sunk) 25%,
    var(--color-border-subtle) 37%,
    var(--color-surface-sunk) 63%
  );
  background-size: 400% 100%;
  animation: skeleton-shimmer 1.4s ease infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-shimmer {
  0%   { background-position: 100% 50%; }
  100% { background-position: 0 50%; }
}

.skeleton--text { height: 12px; margin-bottom: var(--space-2); }
.skeleton--title { height: 18px; width: 40%; margin-bottom: var(--space-3); }
.skeleton--line-sm { width: 60%; }
.skeleton--line-xs { width: 35%; }
.skeleton--circle { border-radius: 50%; }
.skeleton--block { height: 100px; }

.skeleton-stack { display: flex; flex-direction: column; gap: var(--space-2); }

.skeleton-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  background: var(--color-surface);
}

/* Spinner */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border-strong);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  flex-shrink: 0;
}

.spinner--sm { width: 14px; height: 14px; border-width: 2px; }
.spinner--lg { width: 32px; height: 32px; border-width: 3px; }

.loading-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-12);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* ==========================================================================
   Progress
   ========================================================================== */

.progress {
  height: 6px;
  background: var(--color-border-subtle);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress__bar {
  height: 100%;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width var(--duration-slow) var(--ease-out);
}

.progress__bar--success { background: var(--color-success); }
.progress__bar--warning { background: var(--color-warning); }
.progress__bar--danger  { background: var(--color-danger); }

/* Stepper */
.stepper {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  overflow-x: auto;
  padding-bottom: var(--space-1);
  scrollbar-width: none;
}

.stepper::-webkit-scrollbar { display: none; }

.stepper__step {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.stepper__dot {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: var(--text-2xs);
  font-weight: var(--weight-semibold);
  background: var(--color-surface-sunk);
  border: 1px solid var(--color-border-strong);
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.stepper__step.is-done .stepper__dot {
  background: var(--color-success);
  border-color: var(--color-success);
  color: #fff;
}

.stepper__step.is-current .stepper__dot {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
  box-shadow: 0 0 0 3px var(--color-primary-soft);
}

.stepper__step.is-failed .stepper__dot {
  background: var(--color-danger);
  border-color: var(--color-danger);
  color: #fff;
}

.stepper__label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  white-space: nowrap;
}

.stepper__step.is-current .stepper__label {
  color: var(--color-text-strong);
  font-weight: var(--weight-semibold);
}

.stepper__step.is-done .stepper__label { color: var(--color-text); }

.stepper__line {
  width: 24px;
  height: 1px;
  background: var(--color-border-strong);
  flex-shrink: 0;
}

.stepper__step.is-done + .stepper__line { background: var(--color-success); }

/* ==========================================================================
   Timeline
   ========================================================================== */

.timeline {
  position: relative;
  padding-left: var(--space-6);
}

.timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--color-border);
  border-radius: var(--radius-full);
}

.timeline__item {
  position: relative;
  padding-bottom: var(--space-5);
}

.timeline__item:last-child { padding-bottom: 0; }

.timeline__marker {
  position: absolute;
  left: calc(var(--space-6) * -1);
  top: 1px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 2px solid var(--color-border-strong);
  display: grid;
  place-items: center;
  color: var(--color-text-muted);
  z-index: 1;
}

.timeline__marker .icon { width: 12px; height: 12px; }

.timeline__item--success .timeline__marker { border-color: var(--color-success); color: var(--color-success); background: var(--color-success-bg); }
.timeline__item--warning .timeline__marker { border-color: var(--color-warning); color: var(--color-warning); background: var(--color-warning-bg); }
.timeline__item--danger  .timeline__marker { border-color: var(--color-danger);  color: var(--color-danger);  background: var(--color-danger-bg); }
.timeline__item--info    .timeline__marker { border-color: var(--color-info);    color: var(--color-info);    background: var(--color-info-bg); }
.timeline__item--primary .timeline__marker { border-color: var(--color-primary); color: var(--color-primary); background: var(--color-primary-soft); }

.timeline__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.timeline__title {
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-text-strong);
}

.timeline__time {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.timeline__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: 2px;
  line-height: var(--leading-snug);
}

.timeline__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
  flex-wrap: wrap;
}

/* ==========================================================================
   Tooltip (declarative)
   ========================================================================== */

[data-tip] { position: relative; }

[data-tip]::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  background: var(--gray-900);
  color: #fff;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  font-size: var(--text-2xs);
  font-weight: var(--weight-medium);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-fast) var(--ease-out),
              transform var(--duration-fast) var(--ease-out);
  z-index: var(--z-tooltip);
  box-shadow: var(--shadow-md);
  max-width: 240px;
}

[data-tip]:hover::after,
[data-tip]:focus-visible::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

[data-tip-pos="bottom"]::after {
  bottom: auto;
  top: calc(100% + 6px);
}

[data-tip-pos="left"]::after {
  bottom: auto;
  top: 50%;
  left: auto;
  right: calc(100% + 6px);
  transform: translateY(-50%);
}

/* ==========================================================================
   Filter bar
   ========================================================================== */

.filter-bar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
}

.filter-bar__search {
  flex: 1 1 240px;
  min-width: 200px;
  position: relative;
}

.filter-bar__group {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  border: 1px solid var(--color-primary-border);
}

.filter-chip__x {
  display: grid;
  place-items: center;
  width: 14px;
  height: 14px;
  border-radius: var(--radius-xs);
  transition: var(--transition-colors);
}

.filter-chip__x:hover { background: var(--color-primary-soft-hover); }

/* ==========================================================================
   Notification centre
   ========================================================================== */

.notif {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  transition: var(--transition-colors);
  cursor: pointer;
  text-align: left;
  width: 100%;
  border-left: 3px solid transparent;
}

.notif:hover { background: var(--color-surface-hover); }

.notif.is-unread {
  background: var(--color-primary-soft);
  border-left-color: var(--color-primary);
}

.notif.is-unread:hover { background: var(--color-primary-soft-hover); }

.notif__icon {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-md);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.notif__icon--info     { background: var(--color-info-bg);     color: var(--color-info); }
.notif__icon--success  { background: var(--color-success-bg);  color: var(--color-success); }
.notif__icon--warning  { background: var(--color-warning-bg);  color: var(--color-warning); }
.notif__icon--critical { background: var(--color-critical-bg); color: var(--color-critical); }

.notif__body { flex: 1; min-width: 0; }

.notif__title {
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-text-strong);
  line-height: var(--leading-snug);
}

.notif__msg {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
  line-height: var(--leading-snug);
}

.notif__time {
  font-size: var(--text-2xs);
  color: var(--color-text-subtle);
  margin-top: var(--space-1);
}

/* ==========================================================================
   Global search palette
   ========================================================================== */

.palette-root {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: none;
}

.palette-root.is-open { display: block; }

.palette__backdrop {
  position: absolute;
  inset: 0;
  background: var(--color-overlay);
  animation: fade-in var(--duration-fast) var(--ease-out);
}

.palette {
  position: relative;
  max-width: 640px;
  margin: 10vh auto 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  animation: modal-in var(--duration-base) var(--ease-out);
  display: flex;
  flex-direction: column;
  max-height: 70vh;
}

.palette__input-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.palette__input {
  flex: 1;
  border: none;
  background: none;
  font-size: var(--text-base);
  color: var(--color-text-strong);
  outline: none;
}

.palette__input::placeholder { color: var(--color-text-subtle); }

.palette__results {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-2);
}

.palette__group-label {
  padding: var(--space-3) var(--space-3) var(--space-1);
  font-size: var(--text-2xs);
  font-weight: var(--weight-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-caps);
  color: var(--color-text-subtle);
}

.palette__item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  text-align: left;
  transition: var(--transition-colors);
}

.palette__item:hover,
.palette__item.is-highlighted {
  background: var(--color-primary-soft);
}

.palette__item-icon {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-md);
  background: var(--color-surface-sunk);
  border: 1px solid var(--color-border);
  display: grid;
  place-items: center;
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.palette__item.is-highlighted .palette__item-icon {
  background: var(--color-surface);
  border-color: var(--color-primary-border);
  color: var(--color-primary);
}

.palette__item-body { flex: 1; min-width: 0; }

.palette__item-title {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-strong);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.palette__item-sub {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.palette__footer {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-2) var(--space-4);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-sunk);
  font-size: var(--text-2xs);
  color: var(--color-text-muted);
}

.palette__hint { display: flex; align-items: center; gap: var(--space-1); }

/* ==========================================================================
   Description list (record details)
   ========================================================================== */

.dl {
  display: grid;
  grid-template-columns: minmax(120px, auto) 1fr;
  gap: var(--space-3) var(--space-5);
  align-items: baseline;
}

.dl dt {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: var(--weight-medium);
}

.dl dd {
  font-size: var(--text-sm);
  color: var(--color-text-strong);
  min-width: 0;
  word-break: break-word;
}

.dl--stacked {
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.dl--stacked dt { margin-bottom: 2px; }

/* Info grid used on detail pages */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-4) var(--space-5);
}

.info-item__label {
  font-size: var(--text-2xs);
  font-weight: var(--weight-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-caps);
  color: var(--color-text-subtle);
  margin-bottom: 3px;
}

.info-item__value {
  font-size: var(--text-md);
  color: var(--color-text-strong);
  font-weight: var(--weight-medium);
  word-break: break-word;
}

/* ==========================================================================
   Chart container
   ========================================================================== */

.chart-wrap {
  position: relative;
  width: 100%;
}

.chart-wrap canvas { max-width: 100%; }

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.chart-legend__item { display: flex; align-items: center; gap: var(--space-2); }

.chart-legend__swatch {
  width: 9px;
  height: 9px;
  border-radius: 2px;
  flex-shrink: 0;
}

/* ==========================================================================
   List rows (recent activity, compact lists)
   ========================================================================== */

.list-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border-subtle);
  transition: var(--transition-colors);
  width: 100%;
  text-align: left;
}

.list-row:last-child { border-bottom: none; }
button.list-row:hover { background: var(--color-surface-hover); }

.list-row__body { flex: 1; min-width: 0; }

.list-row__title {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-strong);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.list-row__sub {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: 1px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.list-row__end {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-align: right;
}

/* ==========================================================================
   Misc
   ========================================================================== */

.code-ref {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  background: var(--color-surface-sunk);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  padding: 1px 5px;
  color: var(--color-text);
  white-space: nowrap;
}

.meta-sep {
  color: var(--color-text-subtle);
  user-select: none;
}

.flag-mark {
  display: inline-grid;
  place-items: center;
  width: 18px;
  height: 18px;
  border-radius: var(--radius-xs);
  font-size: var(--text-2xs);
  font-weight: var(--weight-bold);
  line-height: 1;
}

.flag-mark--h { background: var(--color-danger-bg); color: var(--color-danger); }
.flag-mark--l { background: var(--color-info-bg); color: var(--color-info); }
.flag-mark--c { background: var(--color-critical); color: #fff; }
.flag-mark--n { background: var(--color-neutral-bg); color: var(--color-neutral-fg); }

/* ==========================================================================
   Session guard (Phase 11)

   Two pieces of furniture that sit above everything: the countdown banner
   warning that the screen is about to lock, and the lock itself.

   The lock sits above the tooltip layer deliberately. It is the one thing in
   the application that nothing may draw over — a modal, a toast or a dropdown
   floating on top of a locked screen would be a hole in the lock.
   ========================================================================== */

.session-warning {
  position: fixed;
  left: 50%;
  bottom: var(--space-6);
  transform: translateX(-50%);
  z-index: calc(var(--z-tooltip) + 10);
  width: min(660px, calc(100vw - var(--space-6)));
  background: var(--color-surface);
  border: 1px solid var(--color-warning-border, var(--color-border-strong));
  border-left: 4px solid var(--color-warning, #d98324);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  animation: session-warning-in 160ms ease-out;
}

@keyframes session-warning-in {
  from { opacity: 0; transform: translate(-50%, 10px); }
  to   { opacity: 1; transform: translate(-50%, 0); }
}

@media (prefers-reduced-motion: reduce) {
  .session-warning { animation: none; }
}

.session-warning__body {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
}

.session-warning__icon {
  color: var(--color-warning, #d98324);
  flex: 0 0 auto;
  margin-top: 2px;
}

.session-warning__text { flex: 1 1 auto; min-width: 0; }

.session-warning__title {
  font-weight: var(--weight-semibold);
  color: var(--color-text-strong);
}

.session-warning__title [data-countdown] {
  font-variant-numeric: tabular-nums;
  font-weight: var(--weight-bold);
}

.session-warning__msg {
  margin-top: 2px;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-normal);
}

.session-warning__actions {
  display: flex;
  gap: var(--space-2);
  flex: 0 0 auto;
  align-items: center;
}

/* ---------- The lock ------------------------------------------------- */

.session-lock {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-tooltip) + 20);
  display: grid;
  place-items: center;
  padding: var(--space-5);
  background: var(--color-backdrop, rgba(12, 16, 24, 0.72));
  /* Blur what is behind it, so a patient list is not readable through the
     overlay by anyone glancing at the screen. */
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.session-lock[hidden] { display: none; }

body.is-locked { overflow: hidden; }

.session-lock__card {
  width: min(380px, 100%);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl, var(--shadow-lg));
  padding: var(--space-7) var(--space-6) var(--space-5);
  text-align: center;
}

.session-lock__mark {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--space-4);
  display: grid;
  place-items: center;
  border-radius: var(--radius-full, 999px);
  background: var(--color-surface-sunken, rgba(0, 0, 0, 0.05));
  color: var(--color-text-muted);
}

.session-lock__title {
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  color: var(--color-text-strong);
}

.session-lock__sub {
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-normal);
}

.session-lock__form {
  margin-top: var(--space-5);
  text-align: left;
}

.session-lock__form .btn { margin-top: var(--space-3); }

.session-lock__error {
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-danger, #c0392b);
}

.session-lock__error[hidden] { display: none; }

.session-lock__out { margin-top: var(--space-3); }

.session-lock__note {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
  line-height: var(--leading-normal);
}

@media (max-width: 560px) {
  .session-warning__body { flex-wrap: wrap; }
  .session-warning__actions { width: 100%; justify-content: flex-end; }
  .session-lock { padding: var(--space-4); }
  .session-lock__card { padding: var(--space-6) var(--space-5) var(--space-4); }
}