/**
 * ViaTone Pulse — Premium Design System components v1.0 (Phase 0)
 *
 * Reusable primitives only. No page-specific layouts.
 * Spec: Docs/design/ViaTone Pulse Premium UX v1.0.md
 *
 * Primary CTA = purple (--pulse-primary)
 * Success / Live = green (--pulse-success)
 */

/* ═══════════════════════════════════════════════════════════════════════
   Buttons
   ═══════════════════════════════════════════════════════════════════════ */

.a4u-btn,
.pulse-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--pulse-space-2);
  font-family: var(--pulse-font);
  font-size: var(--pulse-text-body-sm);
  font-weight: 600;
  line-height: 1;
  padding: var(--pulse-space-3) var(--pulse-space-5);
  border-radius: var(--pulse-radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    background var(--pulse-motion-fast) var(--pulse-ease-out),
    border-color var(--pulse-motion-fast) var(--pulse-ease-out),
    color var(--pulse-motion-fast) var(--pulse-ease-out),
    box-shadow var(--pulse-motion-fast) var(--pulse-ease-out),
    transform var(--pulse-motion-fast) var(--pulse-ease-out);
  white-space: nowrap;
  text-decoration: none;
}

.a4u-btn:hover,
.pulse-btn:hover {
  text-decoration: none;
}

.a4u-btn:active,
.pulse-btn:active {
  transform: scale(0.98);
}

.a4u-btn:disabled,
.pulse-btn:disabled,
.a4u-btn[aria-disabled="true"],
.pulse-btn[aria-disabled="true"] {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

/* Primary = brand purple */
.a4u-btn--primary,
.pulse-btn--primary {
  background: var(--pulse-primary);
  color: var(--pulse-primary-contrast);
}

.a4u-btn--primary:hover:not(:disabled),
.pulse-btn--primary:hover:not(:disabled) {
  background: var(--pulse-primary-hover);
}

/* Success / live actions (green) */
.a4u-btn--success,
.pulse-btn--success {
  background: var(--pulse-success);
  color: var(--pulse-success-contrast);
}

.a4u-btn--success:hover:not(:disabled),
.pulse-btn--success:hover:not(:disabled) {
  background: var(--pulse-success-hover);
}

.a4u-btn--secondary,
.pulse-btn--secondary {
  background: var(--pulse-surface-raised);
  color: var(--pulse-text);
  border-color: var(--pulse-border-strong);
}

.a4u-btn--secondary:hover:not(:disabled),
.pulse-btn--secondary:hover:not(:disabled) {
  background: var(--pulse-surface-hover);
}

.a4u-btn--ghost,
.pulse-btn--ghost {
  background: transparent;
  color: var(--pulse-text-secondary);
  border-color: var(--pulse-border);
}

.a4u-btn--ghost:hover:not(:disabled),
.pulse-btn--ghost:hover:not(:disabled) {
  background: var(--pulse-surface);
  color: var(--pulse-text);
}

.a4u-btn--danger,
.pulse-btn--danger {
  background: var(--pulse-danger-soft);
  color: var(--pulse-danger);
  border-color: color-mix(in srgb, var(--pulse-danger) 30%, transparent);
}

.a4u-btn--danger:hover:not(:disabled),
.pulse-btn--danger:hover:not(:disabled) {
  background: color-mix(in srgb, var(--pulse-danger) 18%, transparent);
}

.a4u-btn--sm,
.pulse-btn--sm {
  font-size: var(--pulse-text-label);
  padding: var(--pulse-space-2) var(--pulse-space-3);
}

.a4u-btn--lg,
.pulse-btn--lg {
  font-size: var(--pulse-text-body);
  padding: var(--pulse-space-4) var(--pulse-space-6);
}

.a4u-icon-btn,
.pulse-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--pulse-radius-sm);
  border: 1px solid transparent;
  background: transparent;
  color: var(--pulse-text-secondary);
  cursor: pointer;
  transition:
    background var(--pulse-motion-fast) var(--pulse-ease-out),
    color var(--pulse-motion-fast) var(--pulse-ease-out);
}

.a4u-icon-btn:hover,
.pulse-icon-btn:hover {
  background: var(--pulse-surface-hover);
  color: var(--pulse-text);
}

.a4u-icon-btn--sm,
.pulse-icon-btn--sm {
  width: 28px;
  height: 28px;
}

/* ═══════════════════════════════════════════════════════════════════════
   Cards
   ═══════════════════════════════════════════════════════════════════════ */

.a4u-card,
.pulse-card {
  background: var(--pulse-surface);
  border: 1px solid var(--pulse-border);
  border-radius: var(--pulse-radius-md);
  padding: var(--pulse-space-5);
  box-shadow: var(--pulse-shadow-sm);
}

.a4u-card--raised,
.pulse-card--raised {
  background: var(--pulse-surface-raised);
}

.a4u-card--interactive,
.pulse-card--interactive {
  transition:
    border-color var(--pulse-motion-base) var(--pulse-ease-out),
    box-shadow var(--pulse-motion-base) var(--pulse-ease-out),
    transform var(--pulse-motion-base) var(--pulse-ease-out);
  cursor: pointer;
}

.a4u-card--interactive:hover,
.pulse-card--interactive:hover {
  border-color: var(--pulse-border-strong);
  box-shadow: var(--pulse-shadow-md);
  transform: translateY(-1px);
}

.pulse-entity-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--pulse-space-4);
  align-items: center;
  padding: var(--pulse-space-4);
  background: var(--pulse-surface);
  border: 1px solid var(--pulse-border);
  border-radius: var(--pulse-radius-md);
  box-shadow: var(--pulse-shadow-sm);
  text-align: left;
  color: inherit;
  text-decoration: none;
  transition:
    border-color var(--pulse-motion-base) var(--pulse-ease-out),
    box-shadow var(--pulse-motion-base) var(--pulse-ease-out);
}

a.pulse-entity-card:hover {
  text-decoration: none;
  border-color: var(--pulse-border-strong);
  box-shadow: var(--pulse-shadow-md);
}

.pulse-entity-card__cover {
  width: 64px;
  height: 64px;
  border-radius: var(--pulse-radius-sm);
  object-fit: cover;
  background: var(--pulse-surface-hover);
  flex-shrink: 0;
}

.pulse-entity-card__cover--lg {
  width: 96px;
  height: 96px;
  border-radius: var(--pulse-radius-md);
}

.pulse-entity-card__body {
  min-width: 0;
}

.pulse-entity-card__title {
  font-size: var(--pulse-text-body);
  font-weight: 650;
  letter-spacing: var(--pulse-tracking-tight);
  margin: 0;
}

.pulse-entity-card__meta {
  margin-top: var(--pulse-space-1);
  font-size: var(--pulse-text-meta);
  color: var(--pulse-text-muted);
}

.pulse-entity-card__actions {
  display: flex;
  gap: var(--pulse-space-2);
  flex-shrink: 0;
}

.a4u-metric,
.pulse-metric-card {
  padding: var(--pulse-space-5);
  background: var(--pulse-surface);
  border: 1px solid var(--pulse-border);
  border-radius: var(--pulse-radius-md);
  box-shadow: var(--pulse-shadow-sm);
}

.a4u-metric__value,
.pulse-metric-card__value {
  font-size: var(--pulse-text-display);
  font-weight: 750;
  letter-spacing: var(--pulse-tracking-tight);
  line-height: var(--pulse-leading-tight);
}

.a4u-metric__label,
.pulse-metric-card__label {
  font-size: var(--pulse-text-label);
  color: var(--pulse-text-muted);
  margin-top: var(--pulse-space-2);
}

.pulse-metric-card__delta {
  display: inline-flex;
  align-items: center;
  gap: var(--pulse-space-1);
  margin-top: var(--pulse-space-2);
  font-size: var(--pulse-text-meta);
  font-weight: 600;
}

.pulse-metric-card__delta--up { color: var(--pulse-success); }
.pulse-metric-card__delta--down { color: var(--pulse-danger); }

.pulse-cover {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--pulse-radius-md);
  background: var(--pulse-surface-hover);
  box-shadow: var(--pulse-shadow-sm);
}

.pulse-cover--sm { width: 48px; border-radius: var(--pulse-radius-sm); }
.pulse-cover--md { width: 96px; }
.pulse-cover--lg { width: 160px; border-radius: var(--pulse-radius-lg); }

/* ═══════════════════════════════════════════════════════════════════════
   Page structure
   ═══════════════════════════════════════════════════════════════════════ */

.pulse-page-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--pulse-space-4);
  margin-bottom: var(--pulse-space-6);
  position: sticky;
  top: 0;
  z-index: 15;
  padding: var(--pulse-space-4) 0;
  background: color-mix(in srgb, var(--pulse-bg) 92%, transparent);
  backdrop-filter: blur(10px);
}

.pulse-page-header__breadcrumbs {
  width: 100%;
  font-size: var(--pulse-text-meta);
  color: var(--pulse-text-muted);
  margin-bottom: var(--pulse-space-1);
}

.pulse-page-header__title {
  font-size: var(--pulse-text-display);
  font-weight: 700;
  letter-spacing: var(--pulse-tracking-tight);
  line-height: var(--pulse-leading-tight);
  margin: 0;
}

.pulse-page-header__subtitle {
  margin-top: var(--pulse-space-2);
  font-size: var(--pulse-text-body-sm);
  color: var(--pulse-text-muted);
  max-width: 42rem;
}

.pulse-page-header__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--pulse-space-2);
  align-items: center;
}

.a4u-section-header,
.pulse-section {
  margin-bottom: var(--pulse-space-6);
}

.a4u-section-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--pulse-space-4);
  margin-bottom: var(--pulse-space-5);
}

.pulse-section__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--pulse-space-4);
  margin-bottom: var(--pulse-space-4);
}

.a4u-section-header h2,
.pulse-section__title {
  font-size: var(--pulse-text-title-sm);
  font-weight: 700;
  letter-spacing: var(--pulse-tracking-tight);
  margin: 0;
}

.a4u-section-header p,
.pulse-section__support {
  color: var(--pulse-text-muted);
  font-size: var(--pulse-text-body-sm);
  margin-top: var(--pulse-space-1);
}

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

.pulse-stack--sm { gap: var(--pulse-space-2); }
.pulse-stack--lg { gap: var(--pulse-space-6); }

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

.pulse-grid {
  display: grid;
  gap: var(--pulse-space-4);
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.pulse-content {
  width: 100%;
  max-width: var(--pulse-content-max);
  margin: 0 auto;
  padding: var(--pulse-content-pad);
}

.pulse-toolbar,
.pulse-filter-bar,
.pulse-command-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--pulse-space-3);
  margin-bottom: var(--pulse-space-4);
}

.pulse-filter-bar {
  padding: var(--pulse-space-3) var(--pulse-space-4);
  background: var(--pulse-surface);
  border: 1px solid var(--pulse-border);
  border-radius: var(--pulse-radius-md);
}

.pulse-search {
  display: flex;
  align-items: center;
  gap: var(--pulse-space-2);
  min-width: min(100%, 280px);
  padding: var(--pulse-space-2) var(--pulse-space-3);
  background: var(--pulse-input-bg);
  border: 1px solid var(--pulse-border);
  border-radius: var(--pulse-radius-sm);
  color: var(--pulse-text-muted);
}

.pulse-search:focus-within {
  border-color: var(--pulse-primary);
  box-shadow: var(--pulse-focus);
}

.pulse-search__input {
  flex: 1;
  min-width: 0;
  border: 0;
  background: transparent;
  color: var(--pulse-text);
  font: inherit;
  font-size: var(--pulse-text-body-sm);
  outline: none;
}

.pulse-search__kbd {
  font-family: var(--pulse-font-mono);
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--pulse-border);
  color: var(--pulse-text-subtle);
}

/* ═══════════════════════════════════════════════════════════════════════
   Badge / Status / Progress / Avatar
   ═══════════════════════════════════════════════════════════════════════ */

.a4u-pill,
.pulse-badge,
.pulse-status {
  display: inline-flex;
  align-items: center;
  gap: var(--pulse-space-2);
  font-size: var(--pulse-text-meta);
  font-weight: 600;
  padding: var(--pulse-space-1) var(--pulse-space-3);
  border-radius: var(--pulse-radius-full);
  border: 1px solid var(--pulse-border);
  background: var(--pulse-surface-raised);
  color: var(--pulse-text-muted);
  line-height: 1.2;
}

.a4u-pill::before,
.pulse-status::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--pulse-text-subtle);
  flex-shrink: 0;
}

.a4u-pill--ok,
.pulse-badge--success,
.pulse-status--live,
.pulse-status--success {
  color: var(--pulse-success);
  border-color: color-mix(in srgb, var(--pulse-success) 30%, transparent);
  background: var(--pulse-success-soft);
}

.a4u-pill--ok::before,
.pulse-status--live::before,
.pulse-status--success::before {
  background: var(--pulse-success);
}

.a4u-pill--warn,
.pulse-badge--warning,
.pulse-status--warning {
  color: var(--pulse-warning);
  border-color: color-mix(in srgb, var(--pulse-warning) 30%, transparent);
  background: var(--pulse-warning-soft);
}

.a4u-pill--warn::before,
.pulse-status--warning::before {
  background: var(--pulse-warning);
}

.a4u-pill--bad,
.pulse-badge--danger,
.pulse-status--danger {
  color: var(--pulse-danger);
  border-color: color-mix(in srgb, var(--pulse-danger) 30%, transparent);
  background: var(--pulse-danger-soft);
}

.a4u-pill--bad::before,
.pulse-status--danger::before {
  background: var(--pulse-danger);
}

.a4u-pill--info,
.pulse-badge--info,
.pulse-status--info {
  color: var(--pulse-info);
  border-color: color-mix(in srgb, var(--pulse-info) 30%, transparent);
  background: var(--pulse-info-soft);
}

.a4u-pill--info::before,
.pulse-status--info::before {
  background: var(--pulse-info);
}

.pulse-badge--primary {
  color: var(--pulse-primary);
  border-color: color-mix(in srgb, var(--pulse-primary) 30%, transparent);
  background: var(--pulse-primary-soft);
}

.pulse-progress {
  display: block;
  width: 100%;
  height: 8px;
  border-radius: var(--pulse-radius-full);
  background: var(--pulse-surface-hover);
  overflow: hidden;
}

.pulse-progress__bar {
  height: 100%;
  border-radius: inherit;
  background: var(--pulse-primary);
  transition: width var(--pulse-motion-slow) var(--pulse-ease);
}

.pulse-progress__bar--success { background: var(--pulse-success); }

.pulse-progress-circle {
  --pulse-progress-value: 0;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background:
    conic-gradient(var(--pulse-primary) calc(var(--pulse-progress-value) * 1%), var(--pulse-surface-hover) 0);
  mask: radial-gradient(farthest-side, transparent calc(100% - 5px), #000 calc(100% - 4px));
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 5px), #000 calc(100% - 4px));
}

.pulse-avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--pulse-primary-soft);
  color: var(--pulse-primary);
  font-size: var(--pulse-text-label);
  font-weight: 700;
  flex-shrink: 0;
  overflow: hidden;
}

.pulse-avatar--sm { width: 28px; height: 28px; font-size: 11px; }
.pulse-avatar--lg { width: 48px; height: 48px; font-size: var(--pulse-text-body); }
.pulse-avatar img { width: 100%; height: 100%; object-fit: cover; }

/* ═══════════════════════════════════════════════════════════════════════
   Empty / Alert / Skeleton
   ═══════════════════════════════════════════════════════════════════════ */

.a4u-empty,
.pulse-empty {
  text-align: center;
  padding: var(--pulse-space-9) var(--pulse-space-6);
  color: var(--pulse-text-muted);
  background: var(--pulse-surface);
  border: 1px dashed var(--pulse-border-strong);
  border-radius: var(--pulse-radius-lg);
}

.a4u-empty h3,
.pulse-empty__title {
  color: var(--pulse-text);
  font-size: var(--pulse-text-title-sm);
  font-weight: 700;
  margin: 0 0 var(--pulse-space-2);
}

.a4u-empty p,
.pulse-empty__body {
  font-size: var(--pulse-text-body-sm);
  max-width: 360px;
  margin: 0 auto var(--pulse-space-5);
  line-height: var(--pulse-leading-body);
}

.pulse-empty__icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--pulse-space-4);
  border-radius: var(--pulse-radius-md);
  display: grid;
  place-items: center;
  background: var(--pulse-primary-soft);
  color: var(--pulse-primary);
  font-size: 1.25rem;
}

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

.a4u-alert,
.pulse-alert {
  padding: var(--pulse-space-3) var(--pulse-space-4);
  border-radius: var(--pulse-radius-sm);
  font-size: var(--pulse-text-body-sm);
  border: 1px solid var(--pulse-border);
  background: var(--pulse-surface-raised);
}

.a4u-alert--info,
.pulse-alert--info {
  border-color: color-mix(in srgb, var(--pulse-info) 35%, transparent);
  background: var(--pulse-info-soft);
  color: var(--pulse-text);
}

.a4u-alert--ok,
.pulse-alert--success {
  border-color: color-mix(in srgb, var(--pulse-success) 35%, transparent);
  background: var(--pulse-success-soft);
  color: var(--pulse-text);
}

.a4u-alert--warn,
.pulse-alert--warning {
  border-color: color-mix(in srgb, var(--pulse-warning) 35%, transparent);
  background: var(--pulse-warning-soft);
  color: var(--pulse-text);
}

.a4u-skeleton,
.pulse-skeleton {
  background: linear-gradient(
    90deg,
    var(--pulse-surface) 0%,
    var(--pulse-surface-hover) 50%,
    var(--pulse-surface) 100%
  );
  background-size: 200% 100%;
  animation: pulse-shimmer 1.2s ease-in-out infinite;
  border-radius: var(--pulse-radius-sm);
}

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

@keyframes a4u-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

@media (prefers-reduced-motion: reduce) {
  .a4u-skeleton,
  .pulse-skeleton {
    animation: none;
  }
}

.a4u-img-fallback {
  display: grid !important;
  place-items: center;
  background: var(--pulse-surface-raised);
  color: var(--pulse-text-muted);
  font-size: 1.25rem;
  flex-shrink: 0;
}

/* ═══════════════════════════════════════════════════════════════════════
   Tabs / Timeline / Checklist / Table
   ═══════════════════════════════════════════════════════════════════════ */

.pulse-tabs {
  display: flex;
  flex-wrap: nowrap;
  gap: var(--pulse-space-1);
  overflow-x: auto;
  border-bottom: 1px solid var(--pulse-border);
  margin-bottom: var(--pulse-space-5);
  -webkit-overflow-scrolling: touch;
}

.pulse-tabs__btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--pulse-text-muted);
  font: inherit;
  font-size: var(--pulse-text-body-sm);
  font-weight: 600;
  padding: var(--pulse-space-3) var(--pulse-space-4);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  cursor: pointer;
  white-space: nowrap;
  transition: color var(--pulse-motion-fast) var(--pulse-ease-out);
}

.pulse-tabs__btn:hover {
  color: var(--pulse-text);
}

.pulse-tabs__btn[aria-selected="true"],
.pulse-tabs__btn--active {
  color: var(--pulse-primary);
  border-bottom-color: var(--pulse-primary);
}

.pulse-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.pulse-timeline__item {
  display: grid;
  grid-template-columns: 16px 1fr;
  gap: var(--pulse-space-3);
  padding-bottom: var(--pulse-space-5);
  position: relative;
}

.pulse-timeline__item::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 14px;
  bottom: 0;
  width: 2px;
  background: var(--pulse-border);
}

.pulse-timeline__item:last-child::before { display: none; }

.pulse-timeline__dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--pulse-primary-soft);
  border: 2px solid var(--pulse-primary);
  z-index: 1;
}

.pulse-timeline__title {
  font-size: var(--pulse-text-body-sm);
  font-weight: 600;
}

.pulse-timeline__meta {
  font-size: var(--pulse-text-meta);
  color: var(--pulse-text-muted);
  margin-top: 2px;
}

.pulse-checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--pulse-space-2);
}

.pulse-checklist__item {
  display: flex;
  align-items: flex-start;
  gap: var(--pulse-space-3);
  padding: var(--pulse-space-3);
  border-radius: var(--pulse-radius-sm);
  border: 1px solid var(--pulse-border);
  background: var(--pulse-surface);
}

.pulse-checklist__item--done {
  opacity: 0.72;
}

.pulse-checklist__item--done .pulse-checklist__label {
  text-decoration: line-through;
  color: var(--pulse-text-muted);
}

.pulse-checklist__check {
  width: 18px;
  height: 18px;
  margin-top: 1px;
  border-radius: 4px;
  border: 1.5px solid var(--pulse-border-strong);
  display: grid;
  place-items: center;
  flex-shrink: 0;
  background: var(--pulse-input-bg);
}

.pulse-checklist__item--done .pulse-checklist__check {
  background: var(--pulse-success);
  border-color: var(--pulse-success);
  color: var(--pulse-success-contrast);
  font-size: 11px;
}

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

.pulse-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--pulse-text-body-sm);
}

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

.pulse-table th {
  font-size: var(--pulse-text-meta);
  font-weight: 650;
  color: var(--pulse-text-muted);
  background: color-mix(in srgb, var(--pulse-surface-hover) 60%, transparent);
}

.pulse-table tr:last-child td { border-bottom: 0; }

.pulse-table tr:hover td {
  background: color-mix(in srgb, var(--pulse-surface-hover) 45%, transparent);
}

/* ═══════════════════════════════════════════════════════════════════════
   Overlays — Dialog / Drawer / Dropdown
   ═══════════════════════════════════════════════════════════════════════ */

.pulse-dialog {
  position: fixed;
  inset: 0;
  z-index: 1200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--pulse-space-4);
}

.pulse-dialog[hidden] { display: none !important; }

.pulse-dialog__backdrop {
  position: absolute;
  inset: 0;
  background: var(--pulse-overlay);
}

.pulse-dialog__panel {
  position: relative;
  z-index: 1;
  width: min(100%, 480px);
  max-height: min(90vh, 720px);
  overflow: auto;
  background: var(--pulse-surface);
  border: 1px solid var(--pulse-border);
  border-radius: var(--pulse-radius-lg);
  box-shadow: var(--pulse-shadow-lg);
  padding: var(--pulse-space-6);
}

.pulse-dialog__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--pulse-space-3);
  margin-bottom: var(--pulse-space-4);
}

.pulse-dialog__title {
  font-size: var(--pulse-text-title-sm);
  font-weight: 700;
  margin: 0;
}

.pulse-drawer {
  position: fixed;
  inset: 0;
  z-index: 1100;
  display: flex;
  justify-content: flex-end;
}

.pulse-drawer[hidden] { display: none !important; }

.pulse-drawer__backdrop {
  position: absolute;
  inset: 0;
  background: var(--pulse-overlay);
}

.pulse-drawer__panel {
  position: relative;
  z-index: 1;
  width: min(100%, 420px);
  height: 100%;
  overflow: auto;
  background: var(--pulse-surface);
  border-left: 1px solid var(--pulse-border);
  box-shadow: var(--pulse-shadow-lg);
  padding: var(--pulse-space-6);
  animation: pulse-drawer-in var(--pulse-motion-base) var(--pulse-ease);
}

@keyframes pulse-drawer-in {
  from { transform: translateX(12px); opacity: 0.6; }
  to { transform: translateX(0); opacity: 1; }
}

.pulse-dropdown {
  position: relative;
  display: inline-block;
  z-index: 1;
}

.pulse-dropdown:has([aria-expanded="true"]),
.pulse-dropdown:focus-within {
  z-index: 60;
}

.pulse-dropdown__panel {
  position: absolute;
  right: 0;
  top: calc(100% + 4px);
  min-width: 11.5rem;
  padding: var(--pulse-space-1);
  background: var(--pulse-surface-raised);
  border: 1px solid var(--pulse-border);
  border-radius: var(--pulse-radius-md);
  box-shadow: var(--pulse-shadow-md);
  z-index: 60;
}

.pulse-dropdown__panel[hidden] { display: none !important; }

.pulse-dropdown__item {
  display: block;
  width: 100%;
  text-align: left;
  background: transparent;
  border: 0;
  color: var(--pulse-text);
  font: inherit;
  font-size: var(--pulse-text-body-sm);
  padding: var(--pulse-space-2) var(--pulse-space-3);
  border-radius: var(--pulse-radius-sm);
  text-decoration: none;
  cursor: pointer;
}

.pulse-dropdown__item:hover,
.pulse-dropdown__item:focus-visible {
  background: var(--pulse-primary-soft);
  outline: none;
}

/* ═══════════════════════════════════════════════════════════════════════
   Shell layout primitives (structure only — wired in Phase 1)
   ═══════════════════════════════════════════════════════════════════════ */

.pulse-shell {
  display: flex;
  min-height: 100vh;
  background: var(--pulse-bg);
}

.pulse-shell__main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.pulse-shell__body {
  display: flex;
  flex: 1;
  min-height: 0;
}

.pulse-shell__content {
  flex: 1;
  min-width: 0;
}

.pulse-shell__rail {
  width: var(--pulse-rail-w);
  flex-shrink: 0;
  border-left: 1px solid var(--pulse-border);
  background: var(--pulse-bg-elevated);
  padding: var(--pulse-space-5);
  display: none;
}

@media (min-width: 1280px) {
  .pulse-shell__rail { display: block; }
}

.pulse-session-dock {
  margin: var(--pulse-space-3);
  padding: var(--pulse-space-3);
  border-radius: var(--pulse-radius-md);
  border: 1px solid var(--pulse-sidebar-border, var(--pulse-border));
  background: color-mix(in srgb, var(--pulse-primary) 10%, #111318);
  color: #f4f5f6;
}

.pulse-session-dock__title {
  font-size: var(--pulse-text-label);
  font-weight: 650;
  margin: 0 0 var(--pulse-space-1);
}

.pulse-session-dock__meta {
  font-size: var(--pulse-text-meta);
  opacity: 0.8;
  margin-bottom: var(--pulse-space-3);
}

.pulse-session-dock__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--pulse-space-2);
}

.pulse-coming-soon {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--pulse-space-3);
  padding: var(--pulse-space-7);
  border-radius: var(--pulse-radius-lg);
  border: 1px dashed var(--pulse-border-strong);
  background: color-mix(in srgb, var(--pulse-primary-soft) 40%, var(--pulse-surface));
}

.pulse-coming-soon__eyebrow {
  font-size: var(--pulse-text-meta);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--pulse-primary);
}

.pulse-coming-soon__title {
  font-size: var(--pulse-text-title);
  font-weight: 700;
  margin: 0;
  letter-spacing: var(--pulse-tracking-tight);
}

.pulse-coming-soon__body {
  margin: 0;
  color: var(--pulse-text-muted);
  font-size: var(--pulse-text-body-sm);
  max-width: 28rem;
}

/* ═══════════════════════════════════════════════════════════════════════
   Legacy helpers retained
   ═══════════════════════════════════════════════════════════════════════ */

.a4u-activity-item {
  display: flex;
  gap: var(--pulse-space-3);
  padding: var(--pulse-space-3) 0;
  border-bottom: 1px solid var(--pulse-border);
}

.a4u-activity-item:last-child { border-bottom: none; }

.a4u-activity-item__icon {
  width: 36px;
  height: 36px;
  border-radius: var(--pulse-radius-sm);
  background: var(--pulse-surface-raised);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}

.a4u-activity-item__title {
  font-size: var(--pulse-text-body-sm);
  font-weight: 600;
}

.a4u-activity-item__meta {
  font-size: var(--pulse-text-meta);
  color: var(--pulse-text-muted);
  margin-top: 2px;
}

.a4u-queue-item {
  display: flex;
  align-items: center;
  gap: var(--pulse-space-3);
  padding: 10px 0;
  border-bottom: 1px solid var(--pulse-border);
}

.a4u-queue-item:last-child { border-bottom: none; }

.a4u-queue-item__num {
  width: 28px;
  height: 28px;
  border-radius: var(--pulse-radius-sm);
  background: var(--pulse-primary-soft);
  color: var(--pulse-primary);
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.a4u-queue-item__name {
  font-size: var(--pulse-text-body-sm);
  font-weight: 600;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.a4u-queue-item__meta {
  font-size: var(--pulse-text-meta);
  color: var(--pulse-text-muted);
  flex-shrink: 0;
}

.a4u-truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.a4u-break {
  overflow-wrap: anywhere;
  word-break: break-word;
}

.a4u-metrics-grid,
.a4u-session-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--pulse-space-3);
}

.a4u-nav-item__soon {
  margin-left: auto;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--pulse-text-subtle);
}

button.a4u-nav-item {
  width: 100%;
  text-align: left;
  background: transparent;
  font: inherit;
  color: inherit;
  cursor: pointer;
}

.a4u-preview-banner {
  position: sticky;
  top: 0;
  z-index: 90;
  padding: 8px 16px;
  padding-left: max(16px, env(safe-area-inset-left));
  padding-right: max(16px, env(safe-area-inset-right));
  background: #3b2f14;
  color: #ffe8a8;
  font-size: 12px;
  font-weight: 500;
  text-align: center;
  border-bottom: 1px solid rgba(255, 200, 80, 0.25);
}

.a4u-preview-banner__host {
  opacity: 0.85;
  margin-left: 6px;
}

.a4u-whats-new {
  margin-bottom: var(--pulse-space-5);
}

.a4u-whats-new__inner {
  background: color-mix(in srgb, var(--pulse-primary-soft) 70%, var(--pulse-success-soft));
  border: 1px solid var(--pulse-border);
  border-radius: var(--pulse-radius-md);
  padding: var(--pulse-space-5);
}

.a4u-whats-new__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--pulse-space-3);
  margin-bottom: 10px;
}

.a4u-whats-new__head h2 {
  font-size: 16px;
  font-weight: 700;
  margin: 0;
}

.a4u-whats-new__list {
  margin: 0 0 10px;
  padding-left: 1.15rem;
  color: var(--pulse-text-secondary);
  font-size: 13px;
  line-height: 1.5;
}

.a4u-whats-new__list li + li { margin-top: 6px; }

.a4u-whats-new__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--pulse-space-2);
  margin-top: var(--pulse-space-3);
}