/* ── Fonts ──────────────────────────────────────────────────────────────────── */
/* Vendored (latin subset, variable weight) so the app works offline under
   Electron's file:// + default-src 'self' CSP — see vendor/fonts/. */
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url("./vendor/fonts/Inter-latin-variable.woff2") format("woff2");
}
@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 400 500;
  font-display: swap;
  src: url("./vendor/fonts/JetBrainsMono-latin-variable.woff2") format("woff2");
}

/* ── Reset & Tokens ─────────────────────────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
.hidden {
  display: none !important;
}

/* Visually hidden, still read by screen readers. Pairs with .skip-link, which
   un-hides itself on focus. */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Contrast ratios below were measured, not eyeballed. Text tokens clear WCAG AA
   (4.5:1) against every surface they are used on — --text-muted is the floor at
   4.78:1 on --bg-active. --text-dim is deliberately BELOW 4.5:1: it is for
   non-text UI only (dashed borders, decorative rules), never for copy. */
:root {
  --bg-base: #0d0f11;
  --bg-surface: #131619;
  --bg-elevated: #1a1e22;
  --bg-hover: #22272c;
  --bg-active: #2a3036;

  --accent: #2ee6a8;
  --accent-dim: #21c48e;
  --accent-soft: rgba(46, 230, 168, 0.12);
  --accent-glow: rgba(46, 230, 168, 0.25);
  /* Near-black used for text on solid --accent fills — 11.8:1. */
  --on-accent: #06120e;

  --amber: #e0a458;
  --amber-soft: rgba(224, 164, 88, 0.12);
  --danger: #ff6b6b;
  --danger-soft: rgba(255, 107, 107, 0.12);
  --cyan: #00c8ff;
  --cyan-soft: rgba(0, 200, 255, 0.12);

  --text-primary: #e9eef0;
  --text-secondary: #a3adb4;
  --text-muted: #939ca3;
  --text-dim: #626c73;

  /* Decorative hairline between regions. Control boundaries that carry meaning
     on their own (inputs, outline buttons) must use --border-strong, which
     clears the 3:1 of WCAG 1.4.11. */
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: #626c73;
  --border-accent: rgba(46, 230, 168, 0.35);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --sidebar-w: 180px;
  --topbar-h: 48px;
  --font: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;
  --transition: 0.18s ease;
}

/* ── Focus visibility ─────────────────────────────────────────────────────── */
/* The app had no focus styling at all before this. Keyboard users need every
   interactive element to show where they are. */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 3px;
}

/* ── Browser surfaces ─────────────────────────────────────────────────────── */
/* Text selection — accent-tinted so it matches the design world rather than
   the OS default blue. Text remains --text-primary so 4.5:1 is maintained. */
::selection {
  background: var(--accent-soft);
  color: var(--text-primary);
}

/* Caret follows the accent so the cursor landmark matches interactive affordances. */ /* cspell:ignore affordances */
input,
textarea {
  caret-color: var(--accent);
}

/* Firefox scrollbar — webkit equivalent is set on specific panels below. */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--bg-hover) transparent;
}

.skip-link {
  position: absolute;
  top: 8px;
  left: 8px;
  z-index: 500;
  padding: 10px 16px;
  background: var(--accent);
  color: var(--on-accent);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transform: translateY(-200%);
}
.skip-link:focus {
  transform: translateY(0);
}

/* ── Reduced motion ───────────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  :root {
    --transition: 0s;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  font-family: var(--font);
  background: var(--bg-base);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  /* Keeps drags from selecting chrome, without making DICOM values
     unselectable: the metadata table and overlays opt back in below. */
  user-select: none;
  /* Column flex so the status banner takes its height off the top instead of
     pushing the 100vh shell past the bottom of the window. */
  display: flex;
  flex-direction: column;
}

/* ── Screens ──────────────────────────────────────────────────────────────── */
/* Exactly one of these is visible. The hidden one keeps its DOM (so viewport
   state survives) but is also inert, so it stays out of the tab order and off
   a screen reader's radar. */
.screen {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  /* Containing block + clip for panels that slide in over the screen (Zenodo),
     so an off-screen panel can't scroll the window sideways. */
  position: relative;
  overflow: hidden;
}
.screen.hidden {
  display: none !important;
}

/* ── Server screen (design screens 02-04) ─────────────────────────────────── */
.server-screen {
  background: var(--bg-surface);
}

.server-screen__header {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.server-screen__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}
/* Focused programmatically on arrival; the ring would be noise there, and the
   heading text is what the screen reader announces. */
.server-screen__title:focus {
  outline: none;
}

.btn-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 24px;
  padding: 4px 6px;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font);
  font-size: 14px;
  cursor: pointer;
  transition: color var(--transition);
}
.btn-back:hover {
  color: var(--text-primary);
}

/* Admin-only server-config gear (TK-29). Icon button pushed to the header's right
   edge; matches the muted-to-primary hover of the back link. */
.btn-server-settings {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px;
  background: none;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition:
    color var(--transition),
    background var(--transition);
}
.btn-server-settings:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.server-tabs {
  display: flex;
  gap: 6px;
}
.server-tab {
  padding: 8px 18px;
  border: none;
  border-radius: var(--radius-md);
  background: none;
  color: var(--text-secondary);
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}
.server-tab:hover {
  color: var(--text-primary);
}
.server-tab--active {
  background: var(--accent-soft);
  color: var(--accent);
}

/* Screen 02: the guest landing. */
.server-auth {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 40px 24px;
  min-height: 0;
}
.server-auth.hidden {
  display: none;
}
.auth-card {
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 32px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-lg);
  box-shadow:
    0 4px 32px rgba(0, 0, 0, 0.4),
    0 0 0 1px rgba(46, 230, 168, 0.06);
}
.auth-card__title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}
.auth-card__msg {
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-secondary);
}
.auth-card__icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  margin-bottom: 4px;
}
.auth-card__fields {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.auth-card--settings {
  margin-top: 0;
  gap: 12px;
  padding: 16px 20px;
  background: var(--bg-surface);
  border-color: var(--border);
  box-shadow: none;
}
.auth-settings__label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.server-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.server-panel.hidden {
  display: none;
}
.server-panel:focus {
  outline: none;
}
.server-panel__body {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 20px;
  min-height: 0;
}
.server-panel__actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 14px 20px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.server-filters {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.server-filters .filter-search {
  flex: 1 1 320px;
}
.server-filters .filter-date {
  flex: 0 1 180px;
}

/* Screen 03: wider cards than the sidebar version — this screen's only job is
   finding and opening a study. */
.study-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 10px;
  align-content: start;
}
.study-grid .study-item {
  padding: 14px;
}
.study-grid [role="option"][aria-selected="true"] {
  border-color: var(--accent);
  background: var(--bg-hover);
}
.study-grid:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}
/* State rows shouldn't be stretched across a grid cell each. */
.study-grid .study-item--empty,
.study-grid .study-item--loading,
.study-grid .study-item--error {
  grid-column: 1 / -1;
}

/* Screen 04: upload. */
.upload-drop {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  min-height: 220px;
  padding: 24px;
  border: 2px dashed var(--text-dim);
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  font-size: 14px;
  text-align: center;
  transition:
    border-color var(--transition),
    background var(--transition);
}
.upload-drop.drag-over {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.upload-drop__actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}
/* One panel for the whole upload: title + %, a single bar, phase and bytes,
   and a collapsed list of only the files that failed. */
.upload-progress {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 16px 18px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}
.upload-progress__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}
.upload-progress__title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}
.upload-progress__pct {
  font-size: 22px;
  font-weight: 600;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}
.upload-progress__track {
  height: 10px;
  border-radius: 999px;
  background: var(--bg-base);
  overflow: hidden;
}
.upload-progress__bar {
  display: block;
  height: 100%;
  width: 0%;
  border-radius: 999px;
  background: var(--accent);
  transition: width 0.2s linear;
}
.upload-progress--error .upload-progress__bar {
  background: var(--danger);
}
.upload-progress--done .upload-progress__title {
  color: var(--accent);
}
.upload-progress--error .upload-progress__title {
  color: var(--danger);
}
.upload-progress__meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}
.upload-errors summary {
  cursor: pointer;
  font-size: 12px;
  color: var(--danger);
}
.upload-errors__list {
  list-style: none;
  margin-top: 6px;
  max-height: 160px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
}
.upload-errors__name {
  color: var(--text-primary);
}
.upload-errors__reason {
  color: var(--text-muted);
}

.upload-summary {
  display: flex;
  gap: 4px;
  align-items: baseline;
  font-size: 13px;
}

.server-session {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  font-size: 12px;
  color: var(--text-muted);
}

.upload-note {
  font-size: 12px;
  color: var(--text-muted);
}

/* ── Activity history ─────────────────────────────────────────────────────── */
.dialog--wide {
  width: min(560px, 92vw);
}
.activity-body {
  max-height: 50vh;
  overflow-y: auto;
}
.activity-empty {
  font-size: 13px;
  color: var(--text-muted);
  padding: 12px 0;
}
.activity-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.activity-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 10px;
  background: var(--bg-base);
  border-radius: var(--radius-sm);
}
.activity-item__action {
  font-size: 13px;
  color: var(--text-primary);
}
.activity-item__meta {
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ── Status banner ────────────────────────────────────────────────────────── */
/* Sits above every screen and pushes the layout down rather than covering the
   topbar, so it can't hide the controls it is reporting on. */
.app-banner {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 13px;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
}
.app-banner--success {
  background: var(--accent-soft);
  color: var(--accent);
}
.app-banner--error {
  background: var(--danger-soft);
  color: var(--danger);
}
.app-banner::before {
  content: "✓";
  font-size: 14px;
}
.app-banner--error::before {
  content: "!";
}

/* ── Toast stack ──────────────────────────────────────────────────────────── */
/* Fixed over everything (highest z-index in the app) so a Zenodo error is
   visible regardless of which panel or dialog is open. */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 1000;
  display: flex;
  flex-direction: column-reverse;
  gap: 8px;
  max-width: 340px;
}
.toast {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
  font-size: 12.5px;
  animation: toast-in 0.18s ease-out;
}
.toast--success {
  background: rgba(46, 230, 168, 0.07);
  border-color: var(--border-accent);
}
.toast--error {
  background: rgba(255, 107, 107, 0.07);
  border-color: rgba(255, 107, 107, 0.4);
}
.toast--warning {
  background: rgba(224, 164, 88, 0.07);
  border-color: rgba(224, 164, 88, 0.4);
}
.toast__msg {
  flex: 1;
  color: var(--text-primary);
  line-height: 1.4;
}
.toast__close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  padding: 0 2px;
}
.toast__close:hover {
  color: var(--text-primary);
}
.toast--out {
  animation: toast-out 0.18s ease-in forwards;
}
@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes toast-out {
  from {
    opacity: 1;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    transform: translateY(8px);
  }
}

/* ── App Shell ────────────────────────────────────────────────────────────── */
.app-shell {
  display: flex;
  flex: 1;
  min-height: 0;
}

/* ── Sidebar ──────────────────────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  background: var(--bg-surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 14px 10px;
  gap: 6px;
  flex-shrink: 0;
}

.logo-tile {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--on-accent);
  flex-shrink: 0;
}

.logo-text {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.5px;
}

/* ── Sidebar Tools ────────────────────────────────────────────────────────── */
.sidebar__tools {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
  overflow-y: auto;
}

.toolbar-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
  margin-bottom: 12px;
}

.toolbar__tool {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 12px 8px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.toolbar__tool svg {
  flex-shrink: 0;
}

.toolbar__tool:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.toolbar__tool.active {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--border-accent);
}

.toolbar__tool.active svg {
  filter: drop-shadow(0 0 4px var(--accent-glow));
}

.tool-divider {
  height: 1px;
  background: var(--border);
  margin: 6px 8px;
}

/* ── Sidebar Footer ───────────────────────────────────────────────────────── */
.sidebar__footer {
  border-top: 1px solid var(--border);
  padding-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* ── Sidebar secondary actions list ─────────────────────────────────────── */
.sidebar-actions {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.sidebar-action {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 7px 8px;
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: var(--font);
  font-size: 12px;
  cursor: pointer;
  transition:
    background var(--transition),
    color var(--transition);
  text-align: left;
}
.sidebar-action:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}
.sidebar-action svg:first-child {
  flex-shrink: 0;
  opacity: 0.7;
}
.sidebar-action span {
  flex: 1;
}
.sidebar-action__chevron {
  opacity: 0.4;
  flex-shrink: 0;
}

/* ── Session card ───────────────────────────────────────────────────────── */
.session-card {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-top: 4px;
}
.session-card.hidden {
  display: none;
}
.session-card__logout {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  flex-shrink: 0;
  padding: 0;
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--danger);
  cursor: pointer;
  opacity: 0.6;
  transition:
    opacity var(--transition),
    background var(--transition);
}
.session-card__logout:hover {
  opacity: 1;
  background: var(--danger-soft);
}
.session__expiry {
  font-size: 10px;
  color: var(--amber);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-hover);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}

.btn:hover {
  background: var(--bg-active);
  border-color: rgba(255, 255, 255, 0.12);
}

.btn:active {
  transform: scale(0.97);
}

.btn--accent {
  background: var(--accent);
  color: var(--on-accent);
  border-color: var(--accent);
  font-weight: 600;
}

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

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

/* Tertiary: the one door to everything server-bound. Outline only, so it
   reads as a step away from the free local actions above it. */
.btn--outline {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text-primary);
}
.btn--outline:hover {
  background: var(--bg-hover);
  border-color: var(--text-secondary);
}

/* Session/sign-out: amber rather than red — leaving is not destructive. */
.btn--session {
  background: transparent;
  border-color: var(--amber);
  color: var(--amber);
}
.btn--session:hover {
  background: var(--amber-soft);
  border-color: var(--amber);
}

/* Secondary: a text link, deliberately quieter than the primary button
   directly above it. */
.btn-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 24px;
  padding: 6px 8px;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font);
  font-size: 13px;
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
  transition: color var(--transition);
}
.btn-link:hover {
  color: var(--text-primary);
}

/* ── Session block ────────────────────────────────────────────────────────── */
.session {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 2px 8px;
}
.session.hidden {
  display: none;
}
.session__avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  flex-shrink: 0;
}
.session__info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.session__email {
  font-size: 11px;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.session__status {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 10px;
  color: var(--text-muted);
}
.session__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

/* ── Main Content ─────────────────────────────────────────────────────────── */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* ── Topbar ───────────────────────────────────────────────────────────────── */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 16px;
  height: var(--topbar-h);
  min-height: var(--topbar-h);
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.04);
}

.topbar__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

/* The loaded study's identifier. Mono, because it is an identifier you read
   character by character, not prose. */
.topbar__title {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 400;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.locale-switch__select {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 5px 8px;
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 11px;
  outline: none;
  cursor: pointer;
}

.locale-switch__select:focus-visible {
  border-color: var(--accent);
}

/* ── Topbar Grid & Sync Controls ──────────────────────────────────────────── */
.topbar-grid-controls {
  display: flex;
  flex-direction: row;
  gap: 6px;
  align-items: center;
}

.topbar-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 28px;
  padding: 0 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text-secondary);
  font-family: var(--font);
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  outline: none;
  transition: all var(--transition);
  user-select: none;
}

.topbar-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.15);
}

.topbar-btn.active {
  background: var(--accent-subtle, rgba(0, 180, 216, 0.15));
  color: var(--accent, #00b4d8);
  border-color: var(--accent, #00b4d8);
}

.topbar-btn.btn-sync.active {
  background: var(--accent-subtle, rgba(0, 180, 216, 0.2));
  color: var(--accent, #00b4d8);
  border-color: var(--accent, #00b4d8);
  box-shadow: 0 0 8px rgba(0, 180, 216, 0.3);
}

/* ── Series Navigation ────────────────────────────────────────────────────── */
.series-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.series-nav.hidden {
  display: none;
}

.nav-btn {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.nav-btn:hover:not(:disabled) {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.12);
}

.nav-btn:disabled {
  opacity: 0.3;
  cursor: default;
}

.nav-counter {
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  min-width: 50px;
  text-align: center;
}

/* ── Multi-Viewport Grid Container ────────────────────────────────────────── */
.viewport-wrapper {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

.viewport-container {
  flex: 1;
  position: relative;
  background: #09090b;
  overflow: hidden;
  display: grid;
  gap: 8px;
  padding: 8px;
  width: 100%;
  height: 100%;
  box-sizing: border-box;
}

.viewport-container.grid-layout-1x1 {
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr);
}

.viewport-container.grid-layout-1x2 {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr);
}

.viewport-container.grid-layout-2x2 {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr) minmax(0, 1fr);
}

.viewport-container.cursor-wl {
  cursor: crosshair;
}
.viewport-container.cursor-zoom {
  cursor: zoom-in;
}
.viewport-container.cursor-pan {
  cursor: grab;
}
.viewport-container.cursor-pan:active {
  cursor: grabbing;
}
.viewport-container.cursor-length,
.viewport-container.cursor-ellipse,
.viewport-container.cursor-polygon {
  cursor: crosshair;
}

/* ── Viewport Cell (Multi-Viewport Grid) ─────────────────────────────────── */
.viewport-cell {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  border: 1px solid var(--border-color, #27272a);
  border-radius: var(--radius-sm, 4px);
  outline: none;
  transition:
    border-color 0.15s ease,
    filter 0.15s ease,
    opacity 0.15s ease;
}

.viewport-cell.active {
  border: 1px solid var(--accent, #00b4d8);
  box-shadow:
    inset 0 0 0 1px var(--accent, #00b4d8),
    0 0 12px rgba(0, 180, 216, 0.15);
  opacity: 1;
  filter: brightness(1);
}

.viewport-cell:not(.active) {
  opacity: 0.8;
  filter: brightness(0.7);
}

.viewport-cell:not(.active):hover {
  opacity: 0.95;
  filter: brightness(0.9);
}

/* ── MPR 2x2 Thematic Quadrant Borders & 1x1 Maximization (US-50) ────────── */
.mpr-has-maximized .viewport-cell.is-hidden-by-maximize {
  display: none !important;
}

.viewport-cell.is-maximized {
  grid-column: 1 / -1 !important;
  grid-row: 1 / -1 !important;
  z-index: 10 !important;
  width: 100% !important;
  height: 100% !important;
}

.viewport-cell--axial,
.viewport-cell[data-plane="axial"] {
  border-top: 3px solid #00c8ff !important;
}
.viewport-cell--axial.active,
.viewport-cell[data-plane="axial"].active {
  border-color: #00c8ff !important;
  box-shadow:
    inset 0 0 0 1px #00c8ff,
    0 0 12px rgba(0, 200, 255, 0.25);
}

.viewport-cell--coronal,
.viewport-cell[data-plane="coronal"] {
  border-top: 3px solid #2ee6a8 !important;
}
.viewport-cell--coronal.active,
.viewport-cell[data-plane="coronal"].active {
  border-color: #2ee6a8 !important;
  box-shadow:
    inset 0 0 0 1px #2ee6a8,
    0 0 12px rgba(46, 230, 168, 0.25);
}

.viewport-cell--sagittal,
.viewport-cell[data-plane="sagittal"] {
  border-top: 3px solid #ff5252 !important;
}
.viewport-cell--sagittal.active,
.viewport-cell[data-plane="sagittal"].active {
  border-color: #ff5252 !important;
  box-shadow:
    inset 0 0 0 1px #ff5252,
    0 0 12px rgba(255, 82, 82, 0.25);
}

.viewport-cell--3d,
.viewport-cell[data-plane="3d"] {
  border-top: 3px solid #e0af68 !important;
}
.viewport-cell--3d.active,
.viewport-cell[data-plane="3d"].active {
  border-color: #e0af68 !important;
  box-shadow:
    inset 0 0 0 1px #e0af68,
    0 0 12px rgba(224, 175, 104, 0.25);
}

.viewport-canvas {
  image-rendering: auto;
  transform-origin: center center;
  transition: transform 0.05s linear;
}

.viewport-canvas-gl {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  display: none;
}

.annotation-overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 5;
}

/* 2D Mode (Default) */
#viewport-container:not(.mode-3d) #dicom-canvas {
  display: none !important;
}

/* 3D Mode (Active 3D Volume View) */
#viewport-container.mode-3d .viewport-cell {
  display: none !important; /* Hide 2D grid cells */
}

#viewport-container.mode-3d #dicom-canvas {
  display: block !important;
  position: absolute;
  inset: 0;
  z-index: 50;
  width: 100%;
  height: 100%;
  pointer-events: auto !important;
  touch-action: none;
}

#viewport-container.mode-3d #view-3d-container,
#viewport-container.mode-3d .view-3d-container {
  display: block !important;
}

#dicom-canvas {
  image-rendering: auto;
  transform-origin: center center;
  transition: transform 0.05s linear;
}

/* ── 2D Cardinal Orientation Labels (A, P, L, R) ────────────────────────── */
.viewport-orient-label,
.mpr-orient-label {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: #facc15; /* High-contrast clinical PACS yellow/amber */
  text-shadow:
    -1px -1px 0 #000,
    1px -1px 0 #000,
    -1px 1px 0 #000,
    1px 1px 0 #000,
    0 0 5px rgba(0, 0, 0, 0.95);
  pointer-events: none;
  z-index: 6;
  user-select: none;
  line-height: 1;
}

#mpr-orient-top,
.viewport-orient-label--top,
.mpr-orient-label--top {
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
}

#mpr-orient-bottom,
.viewport-orient-label--bottom,
.mpr-orient-label--bottom {
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
}

#mpr-orient-left,
.viewport-orient-label--left,
.mpr-orient-label--left {
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
}

#mpr-orient-right,
.viewport-orient-label--right,
.mpr-orient-label--right {
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
}

/* ── Info Overlays (HUD) ──────────────────────────────────────────────────── */
.overlay {
  position: absolute;
  user-select: text;
  font-size: 11px;
  font-family: var(--font-mono);
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.6;
  pointer-events: none;
  text-shadow:
    1px 1px 2px rgba(0, 0, 0, 0.9),
    0 0 6px rgba(0, 0, 0, 0.8);
  z-index: 5;
  max-width: 280px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.overlay--tl {
  top: 12px;
  left: 14px;
}
.overlay--tr {
  top: 12px;
  right: 14px;
  text-align: right;
}
.overlay--bl {
  bottom: 12px;
  left: 14px;
}
.overlay--br {
  bottom: 12px;
  right: 14px;
  text-align: right;
}

/* ── Drop Zone ────────────────────────────────────────────────────────────── */
#drop-zone,
.drop-zone {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  background: var(--bg-base);
  transition: background var(--transition);
  pointer-events: none;
}

.drop-zone.hidden {
  display: none;
}

.drop-zone.drag-over {
  background: var(--accent-soft);
}

.drop-zone.drag-over .drop-zone__content {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.drop-zone__content {
  pointer-events: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 48px 64px;
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.02);
  transition: all 0.3s ease;
}

.drop-zone__icon {
  color: var(--text-muted);
  opacity: 0.6;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

.drop-zone__content h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

.drop-zone__content p {
  font-size: 13px;
  color: var(--text-secondary);
}

.drop-zone__note {
  margin-top: 10px;
  max-width: 340px;
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
}
.drop-zone__note strong {
  color: var(--text-secondary);
  font-weight: 600;
}

.drop-zone__shortcuts {
  margin-top: 8px;
  font-size: 11px;
  color: var(--text-muted);
}

.drop-zone__shortcuts kbd {
  display: inline-block;
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-secondary);
}

/* ── Loading Indicator ────────────────────────────────────────────────────── */
.loading-indicator {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: rgba(13, 15, 17, 0.85);
  backdrop-filter: blur(8px);
  z-index: 30;
  font-size: 14px;
  color: var(--text-secondary);
}

.loading-indicator.hidden {
  display: none;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--bg-hover);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ── Error Message ────────────────────────────────────────────────────────── */
.error-message {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 20px;
  background: var(--danger-soft);
  border: 1px solid var(--danger);
  border-radius: var(--radius-md);
  color: var(--danger);
  font-size: 13px;
  z-index: 30;
  backdrop-filter: blur(8px);
  animation: fadeIn 0.3s ease;
}

.error-message.hidden {
  display: none;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

/* ── Metadata Panel ───────────────────────────────────────────────────────── */
.metadata-panel {
  width: 0;
  overflow: hidden;
  background: var(--bg-surface);
  border-left: 1px solid var(--border);
  transition: width 0.25s ease;
  display: flex;
  flex-direction: column;
}

.metadata-panel.open {
  width: 320px;
}

.metadata-header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.metadata-header h2 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.metadata-body {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}

.metadata-table {
  width: 100%;
  border-collapse: collapse;
  /* Tag values exist to be read and copied out. */
  user-select: text;
}

.metadata-table tr {
  transition: background var(--transition);
}

.metadata-table tr:hover {
  background: var(--bg-hover);
}

.metadata-table td {
  padding: 5px 18px;
  font-size: 12px;
  vertical-align: top;
  border: none;
}

.meta-key {
  color: var(--text-muted);
  font-weight: 500;
  white-space: nowrap;
  width: 110px;
}

.meta-val {
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 11px;
  word-break: break-all;
}

.metadata-separator td {
  padding: 4px 18px;
}

.metadata-separator hr {
  border: none;
  border-top: 1px solid var(--border);
}

/* ── Window Level / Presets Panel ─────────────────────────────────────────── */
.wl-panel {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 100;
  width: 280px;
  max-height: calc(100% - 24px);
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transform: translateX(-10px) scale(0.98);
  pointer-events: none;
  transition:
    opacity 0.2s cubic-bezier(0.4, 0, 0.2, 1),
    transform 0.2s cubic-bezier(0.4, 0, 0.2, 1),
    visibility 0.2s;
}

.wl-panel.open {
  opacity: 1;
  visibility: visible;
  transform: translateX(0) scale(1);
  pointer-events: auto;
}

.wl-header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.wl-header h2 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.wl-body {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.wl-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.wl-section-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.slider-control {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-secondary);
}

.slider-val {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  background: var(--bg-elevated);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

.wl-slider,
.styled-slider {
  width: 100%;
  accent-color: var(--accent);
  cursor: pointer;
  background: var(--bg-elevated);
  height: 6px;
  border-radius: 3px;
}

.preset-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.preset-btn {
  font-size: 12px;
  padding: 8px 10px;
  text-align: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition);
}

.preset-btn:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
  color: var(--accent);
}

.preset-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #050508;
  font-weight: 600;
}

.measure-toggle-btn,
.measure-save-btn,
.measure-export-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 12px;
  margin-bottom: 8px;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition);
}

.measure-toggle-btn:hover,
.measure-save-btn:hover,
.measure-export-btn:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
  color: var(--accent);
}

.measure-save-btn.saved {
  border-color: #2ee6a8;
  color: #2ee6a8;
}

.measure-select {
  width: 100%;
  font-size: 13px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition);
}
.measure-select:hover,
.measure-select:focus {
  border-color: var(--accent);
}

.measure-clear-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background: var(--danger-soft);
  border: 1px solid var(--danger);
  color: var(--danger);
  cursor: pointer;
  transition:
    background 0.15s ease,
    color 0.15s ease;
}

.measure-clear-btn:hover {
  background: var(--danger);
  color: #ffffff;
}

/* ── Scrollbar ────────────────────────────────────────────────────────────── */
::-webkit-scrollbar {
  width: 5px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--bg-hover);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--bg-active);
}

/* ── Upload Panel ─────────────────────────────────────────────────────────── */
.btn--secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn--secondary:hover {
  background: var(--bg-hover);
}
.btn--dim {
  opacity: 0.45;
  cursor: default;
}

.btn--danger {
  background: var(--danger);
  color: #fff;
  border-color: var(--danger);
}
.btn--danger:hover {
  background: #e05555;
  border-color: #e05555;
}

/* AI segmentation action group (US-45): the whole group lives in the turquoise
   "IA" family so it reads as one unit, set apart from the study Aprobar/Rechazar.
   Solid = primary actions (Corregir/Enviar/Transferir); soft = quieter/undo
   actions (Cancelar/Descartar corrección/Descartar/Restaurar). */
.btn--seg {
  background: #1abc9c;
  color: #06110d;
  border-color: #1abc9c;
  font-weight: 600;
}
.btn--seg:hover {
  background: #16a085;
  border-color: #16a085;
}
.btn--seg-soft {
  background: rgba(26, 188, 156, 0.14);
  color: #5fe0c8;
  border-color: rgba(26, 188, 156, 0.55);
}
.btn--seg-soft:hover {
  background: rgba(26, 188, 156, 0.24);
  border-color: #1abc9c;
}
.validation-bar__seg-select {
  height: 30px;
  padding: 0 10px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(26, 188, 156, 0.55);
  background: rgba(26, 188, 156, 0.12);
  color: #5fe0c8;
  font-family: var(--font);
  font-size: 13px;
  cursor: pointer;
}
.validation-bar__seg-select:hover {
  border-color: #1abc9c;
}

.upload-status {
  font-size: 11px;
  margin-top: 4px;
  display: block;
}
.upload-status--ok {
  color: var(--accent);
}
.upload-status--error {
  color: var(--danger);
}

/* ── Study Explorer ───────────────────────────────────────────────────────── */
.explorer-panel {
  position: relative;
  width: 340px;
  min-width: 220px;
  max-width: 55vw;
  flex-shrink: 0;
  background: var(--bg-surface);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  min-height: 0;
  transition: width 0.2s ease;
}
.explorer-panel--collapsed {
  width: 0 !important;
  min-width: 0;
  overflow: hidden;
  border-left: none;
}
.explorer-panel__resize-handle {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  cursor: ew-resize;
  z-index: 10;
}
.explorer-panel__resize-handle:hover,
.explorer-panel__resize-handle--dragging {
  background: var(--border-accent);
}

.explorer-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 16px 12px;
  flex-shrink: 0;
}
.explorer-panel__header-actions {
  display: flex;
  align-items: center;
  gap: 2px;
}
.explorer-panel__header h2 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

/* Drag-over state: outline the whole panel so the user can see where to drop. */
.explorer-panel.drag-over {
  outline: 2px dashed var(--accent);
  outline-offset: -3px;
  background: var(--accent-soft);
}

/* Transient upload status written while a drop is being processed. */
.explorer-upload-status {
  padding: 6px 16px;
  font-size: 12px;
  color: var(--text-secondary);
  flex-shrink: 0;
}

/* Session state in the panel footer rather than behind a modal, so it is
   readable at a glance. */
.explorer-footer {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  font-size: 11px;
  color: var(--text-muted);
  flex-shrink: 0;
}

/* min-width/height 24px satisfies WCAG 2.2 SC 2.5.8 (target size, minimum);
   the 14px glyph alone was a 22px target. */
.icon-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 4px;
  min-width: 24px;
  min-height: 24px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.icon-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}
.icon-btn:disabled {
  opacity: 0.3;
  cursor: default;
}
.icon-btn:disabled:hover {
  background: none;
  color: var(--text-secondary);
}

/* Filters */
.explorer-filters {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 0 16px 12px;
  flex-shrink: 0;
}

/* Search row */
.filter-search {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  transition: border-color 0.2s;
}
.filter-search:focus-within {
  border-color: var(--accent);
}
.filter-search__icon {
  color: var(--text-muted);
  flex-shrink: 0;
}
.filter-search__input {
  flex: 1;
  min-width: 0;
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 13px;
  font-family: inherit;
}
.filter-search__input::placeholder {
  color: var(--text-muted);
}
.filter-search__clear {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 3px;
  min-width: 24px;
  min-height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition:
    color 0.15s,
    background 0.15s;
}
.filter-search__clear:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

/* Modality chips */
/* Wrapping, not a horizontal scroller: a clipped filter row hides options
   that keyboard users can still tab into but never see. */
.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.filter-chip {
  background: none;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  color: var(--text-muted);
  font-size: 10px;
  font-weight: 600;
  font-family: inherit;
  padding: 3px 10px;
  min-height: 24px;
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  letter-spacing: 0.04em;
  transition:
    border-color 0.15s,
    color 0.15s,
    background 0.15s;
}
.filter-chip:hover {
  border-color: rgba(255, 255, 255, 0.2);
  color: var(--text-secondary);
}
.filter-chip--active {
  border-color: var(--accent);
  color: var(--on-accent);
  background: var(--accent);
}

/* Date range */
.filter-dates {
  display: flex;
  align-items: center;
  gap: 8px;
}
.filter-date {
  flex: 1;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  outline: none;
  color: var(--text-secondary);
  font-size: 12px;
  font-family: inherit;
  padding: 8px 10px;
  min-width: 0;
  transition:
    border-color 0.2s,
    color 0.2s;
}
.filter-date:focus {
  border-color: var(--accent);
  color: var(--text-primary);
}
.filter-date::-webkit-calendar-picker-indicator {
  filter: invert(0.5);
  cursor: pointer;
  transform: scale(0.85);
}
/* Clear link */
.filter-clear-wrap {
  display: flex;
  justify-content: flex-end;
}
.filter-clear-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 10px;
  font-family: inherit;
  padding: 2px 4px;
  border-radius: 4px;
  transition: color 0.15s;
}
.filter-clear-btn:hover {
  color: var(--text-secondary);
}

/* Study list */
.study-list {
  list-style: none;
  overflow-y: auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 0 16px 12px;
}

.study-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 10px;
  text-align: left;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
  color: inherit;
  font-family: inherit;
  cursor: pointer;
  transition:
    background var(--transition),
    border-color var(--transition),
    box-shadow var(--transition);
}
.study-item:hover {
  background: var(--bg-hover);
  border-color: var(--border-strong);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}
/* aria-current carries this state for assistive tech; the styling follows it
   rather than a separate class, so the two can't drift apart. */
.study-item[aria-current="true"] {
  border-color: var(--accent);
  background: var(--bg-hover);
}

/* Thumbnail */
.study-item__thumb {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-elevated);
  flex-shrink: 0;
  position: relative;
}
.study-item__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.study-item__thumb-fallback {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-soft);
}

/* Marks the study you just uploaded, so it is findable in a list you did not
   sort. Text, not just colour. */
.study-item__new {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--on-accent);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.study-item__badge {
  display: inline-block;
  font-size: 9px;
  font-weight: 700;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 3px;
  padding: 1px 5px;
  margin-right: 4px;
}

.study-item__zenodo-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 3px;
}

.study-item__zenodo-badge {
  display: inline-flex;
  align-items: center;
  font-size: 9px;
  font-weight: 700;
  border-radius: 3px;
  padding: 1px 5px;
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: opacity 0.15s;
}

.study-item__zenodo-badge:hover {
  opacity: 0.8;
  text-decoration: underline;
}

.study-item__zenodo-badge--published {
  background: #1a5fb4;
  color: #ffffff;
}

.study-item__zenodo-badge--imported {
  background: #613583;
  color: #ffffff;
}

.filter-chip--zenodo {
  border-color: #1a5fb4;
  color: #1a5fb4;
}

.filter-chip--zenodo.filter-chip--active {
  background: #1a5fb4;
  border-color: #1a5fb4;
  color: #ffffff;
}

.study-item__info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow: hidden;
  flex: 1;
}
.study-item__name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.study-item__date {
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.study-item__meta {
  font-size: 10px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 2px;
}

/* State variants */
.study-item--loading,
.study-item--error {
  display: block;
  font-size: 12px;
  color: var(--text-secondary);
  padding: 20px 4px;
  cursor: default;
  background: none;
  border: none;
}
.study-item--error {
  color: var(--danger);
}

.study-item--empty {
  cursor: default;
  padding: 0;
  background: none;
  border: none;
}
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 32px 16px;
  text-align: center;
  color: var(--text-secondary);
}
.empty-state p {
  font-size: 12px;
}

/* Pagination */
.explorer-pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}
.pagination-info {
  font-size: 11px;
  color: var(--text-secondary);
}

/* ── Duplicate Dialog ─────────────────────────────────────────────────────── */
.dialog-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
}

.dialog {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  width: 360px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.dialog__title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}
.dialog__msg {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}
.dialog__actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

/* #forgot-dialog is a .dialog <div> wrapping two <form> steps, so the .dialog
   flex gap only spaces the forms from each other — not the message, fields and
   action row inside each form, which would otherwise stack flush together (the
   send-code / cancel button row sitting right against the email input). Repeat
   the column layout on the forms so their contents breathe the same way the
   single-form dialogs (invite, server-config) already do. */
#forgot-dialog form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.login-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}
.login-field input {
  background: var(--bg-base);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  width: 100%;
  transition:
    border-color var(--transition),
    box-shadow var(--transition);
}
.login-field input::placeholder {
  color: var(--text-muted);
}
.login-field input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}
.input-wrap input {
  padding-right: 40px;
}
.input-wrap__toggle {
  position: absolute;
  right: 10px;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  transition: color var(--transition);
  flex-shrink: 0;
}
.input-wrap__toggle:hover {
  color: var(--text-secondary);
}
.auth-card__invite-link {
  background: none;
  border: none;
  font-size: 13px;
  color: var(--text-muted);
  cursor: pointer;
  text-align: center;
  padding: 4px;
  font-family: inherit;
  transition: color var(--transition);
  margin-top: 4px;
}
.auth-card__invite-link:hover {
  color: var(--accent);
}
.login-error {
  font-size: 13px;
  color: var(--danger);
  background: var(--danger-soft);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
}
@media (max-width: 480px) {
  .auth-card {
    padding: 24px 20px;
    border-radius: var(--radius-md);
  }
}

/* ── Server Config Dialog (TK-29) ────────────────────────────────────────── */
.server-config-dialog {
  background: #121218;
  border: 1px solid var(--border);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
  border-radius: var(--radius-md);
  padding: 24px;
  width: 420px;
  max-width: calc(100vw - 32px);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.server-config-dialog__header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.server-config-dialog__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--accent);
  flex-shrink: 0;
}

.server-config-input {
  background: var(--bg-base);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  width: 100%;
  transition:
    border-color var(--transition),
    box-shadow var(--transition);
}

.server-config-input:focus,
.server-config-input:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.server-config-input.server-config-input--error,
.server-config-input[aria-invalid="true"] {
  border-color: var(--danger) !important;
  box-shadow: 0 0 0 3px var(--danger-soft) !important;
}

.server-config-error {
  font-size: 13px;
  color: var(--danger);
  background: var(--danger-soft);
  border: 1px solid rgba(255, 107, 107, 0.25);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  line-height: 1.4;
}

.session-email {
  font-size: 11px;
  color: var(--text-secondary);
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ── Button size variants ─────────────────────────────────────────────────── */
.btn--sm {
  padding: 5px 12px;
  font-size: 11px;
}
.btn--xs {
  padding: 3px 9px;
  font-size: 10px;
  font-weight: 600;
  border-radius: 4px;
}
.btn--success {
  background: var(--accent);
  color: #0a0a0f;
  border-color: var(--accent);
}
.btn--success:hover {
  background: var(--accent-dim);
  border-color: var(--accent-dim);
}

/* ── Zenodo Panel ─────────────────────────────────────────────────────────── */
.zenodo-panel {
  position: absolute;
  right: 0;
  top: var(--topbar-h);
  bottom: 0;
  width: 340px;
  min-width: 260px;
  max-width: 70vw;
  background: var(--bg-surface);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 150;
  transition: transform 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}
.zenodo-panel__resize-handle {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  cursor: ew-resize;
  z-index: 10;
}
.zenodo-panel__resize-handle:hover,
.zenodo-panel__resize-handle--dragging {
  background: var(--border-accent);
}
.zenodo-panel--closed {
  transform: translateX(100%);
  visibility: hidden;
}

/* Header */
.z-panel-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px 0;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.z-panel-logo {
  display: flex;
  align-items: center;
  gap: 7px;
  padding-bottom: 10px;
  color: var(--text-muted);
  flex-shrink: 0;
}
.z-panel-logo svg {
  color: var(--accent);
}
.z-panel-logo span {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  text-transform: uppercase;
}

/* Tabs */
.z-tabs {
  display: flex;
  flex: 1;
  gap: 0;
  align-self: stretch;
}
.z-tab {
  flex: 1;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.03em;
  cursor: pointer;
  padding: 8px 4px 10px;
  transition:
    color 0.15s,
    border-color 0.15s;
}
.z-tab:hover {
  color: var(--text-secondary);
}
.z-tab--active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.z-panel-close {
  padding-bottom: 8px;
  flex-shrink: 0;
}

/* Tab panels */
.z-tab-panel {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
}

/* ── Search tab ───────────────────────────────────────────────────────────── */
.z-doi-bar {
  display: flex;
  gap: 6px;
  padding: 10px 12px 6px;
  flex-shrink: 0;
}
.z-search-bar {
  display: flex;
  gap: 6px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.z-search-input {
  flex: 1;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px 10px;
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 12px;
  outline: none;
  transition: border-color 0.15s;
  min-width: 0;
}
.z-search-input:focus {
  border-color: var(--accent);
}
.z-search-input::placeholder {
  color: var(--text-muted);
}

.z-search-filters {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.z-search-filters::-webkit-scrollbar {
  display: none;
}

.z-env-toggle {
  display: flex;
  gap: 3px;
  flex-shrink: 0;
  margin-left: auto;
}
.z-env-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 2px 7px;
  cursor: pointer;
  transition: all 0.15s;
}
.z-env-btn.active {
  border-color: var(--cyan);
  color: var(--cyan);
  background: var(--cyan-soft);
}

/* Results */
.z-results {
  flex: 1;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--bg-active) transparent;
}
.z-results::-webkit-scrollbar {
  width: 4px;
}
.z-results::-webkit-scrollbar-track {
  background: transparent;
}
.z-results::-webkit-scrollbar-thumb {
  background: var(--bg-active);
  border-radius: 4px;
}

.z-record-card {
  padding: 11px 14px;
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}
.z-record-card:hover {
  background: var(--bg-hover);
}
.z-record-title {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.4;
  margin-bottom: 3px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.z-record-meta {
  font-size: 11px;
  color: var(--text-secondary);
  margin-bottom: 3px;
}
.z-record-doi {
  font-size: 9px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  margin-bottom: 8px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.z-record-footer {
  display: flex;
  align-items: center;
  gap: 5px;
  flex-wrap: wrap;
}

/* Badges */
.z-badge {
  display: inline-flex;
  align-items: center;
  font-size: 9px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 3px;
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.z-badge--dicom {
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--border-accent);
}
.z-badge--muted {
  background: var(--bg-elevated);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

/* Pagination */
.z-pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 12px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}
.z-pagination-info {
  font-size: 10px;
  color: var(--text-muted);
}

/* ── Empty / error states ─────────────────────────────────────────────────── */
.z-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 36px 20px;
  text-align: center;
  color: var(--text-secondary);
}
.z-empty-state p {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-primary);
}
.z-empty-state span {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.5;
}
.z-empty-state .btn {
  margin-top: 8px;
}
.z-empty-state--error p {
  color: var(--danger);
}

/* ── Skeletons ────────────────────────────────────────────────────────────── */
@keyframes z-pulse {
  0%,
  100% {
    opacity: 0.35;
  }
  50% {
    opacity: 0.6;
  }
}
@keyframes skeleton-pulse {
  0%,
  100% {
    opacity: 0.35;
  }
  50% {
    opacity: 0.6;
  }
}
.z-skeleton-card {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.z-skeleton {
  background: var(--bg-elevated);
  border-radius: 4px;
  animation: z-pulse 1.2s ease-in-out infinite;
}
.z-skeleton--lg {
  height: 12px;
  width: 85%;
}
.z-skeleton--md {
  height: 10px;
  width: 55%;
}
.z-skeleton--sm {
  height: 9px;
  width: 35%;
}

/* ── Config tab ───────────────────────────────────────────────────────────── */
.z-config-scroll {
  flex: 1;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--bg-active) transparent;
  padding: 10px 0 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.z-section-label {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.z-env-card {
  margin: 0 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px;
}
.z-env-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}
.z-env-status {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 10px;
  color: var(--text-muted);
}
.z-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}
.z-dot--on {
  background: var(--accent);
  box-shadow: 0 0 5px var(--accent-glow);
}
.z-dot--off {
  background: var(--text-dim);
}

/* Quota bar */
.z-quota {
  margin-bottom: 10px;
}
.z-quota-track {
  height: 4px;
  background: var(--bg-base);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 4px;
}
.z-quota-fill {
  height: 100%;
  border-radius: 2px;
  transition: width 0.4s ease;
}
.z-quota-text {
  font-size: 9px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}
.z-quota--alert {
  border: 1px solid var(--danger);
  border-radius: 4px;
  padding: 6px 8px;
  background: var(--danger-soft);
}
.z-quota--alert .z-quota-text {
  color: var(--danger);
  font-weight: 600;
}

/* Token form */
.z-token-row {
  display: flex;
  gap: 5px;
  align-items: center;
}
.z-token-input {
  flex: 1;
  background: var(--bg-base);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 8px;
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 11px;
  outline: none;
  min-width: 0;
  transition: border-color 0.15s;
}
.z-token-input:focus {
  border-color: var(--accent);
}
.z-token-input::placeholder {
  color: var(--text-muted);
}

/* Sync card */
.z-sync-card {
  margin: 0 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px;
}
.z-sync-meta {
  font-size: 10px;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.z-sync-intervals {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 10px;
}

/* ── Publish tab ──────────────────────────────────────────────────────────── */
.z-publish-scroll {
  flex: 1;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--bg-active) transparent;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.z-publish-study {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 10px 12px;
}
.z-study-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-primary);
  background: var(--accent-soft);
  border: 1px solid var(--border-accent);
  border-radius: 6px;
  padding: 4px 9px;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.z-study-chip svg {
  color: var(--accent);
  flex-shrink: 0;
}

/* Publish form */
.z-publish-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.z-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 11px;
  color: var(--text-secondary);
}
.z-field-hint {
  font-size: 9px;
  color: var(--text-dim);
  font-weight: 400;
}
.z-field input,
.z-field textarea,
.z-field select {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px 9px;
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 12px;
  outline: none;
  transition: border-color 0.15s;
  resize: vertical;
}
.z-field input:focus,
.z-field textarea:focus,
.z-field select:focus {
  border-color: var(--accent);
}
.z-field input::placeholder,
.z-field textarea::placeholder {
  color: var(--text-muted);
}
.z-field select option {
  background: var(--bg-elevated);
}
.z-field-row {
  display: flex;
  gap: 8px;
}
.z-field--half {
  flex: 1;
  min-width: 0;
}

.z-pub-feedback {
  font-size: 11px;
  line-height: 1.5;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
}
.z-pub-feedback--error {
  color: var(--danger);
  background: var(--danger-soft);
  border: 1px solid rgba(255, 107, 107, 0.3);
}
.z-pub-feedback--success {
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--border-accent);
}
.z-pub-feedback code {
  font-family: var(--font-mono);
  font-size: 10px;
}

/* ── Study detail panel (server-screen split layout) ─────────────────────── */
.buscar-layout {
  flex: 1;
  display: flex;
  min-height: 0;
  overflow: hidden;
}
.buscar-layout .server-panel__body {
  flex: 1;
  min-width: 0;
}
.study-detail-panel {
  width: 320px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  background: var(--bg-elevated);
  border-left: 1px solid var(--border);
  overflow-y: auto;
}
.study-detail-panel.hidden {
  display: none;
}
.study-detail-panel__content {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.study-detail-panel__loading {
  color: var(--text-dim);
  font-size: 12px;
  padding: 8px 0;
}
.study-detail-panel__error {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 12px;
  padding: 8px 0;
}
.study-detail-panel__stale {
  display: flex;
  align-items: flex-start;
  gap: 7px;
  font-size: 11px;
  color: var(--amber);
  background: var(--amber-soft);
  border-radius: 6px;
  padding: 8px 10px;
  line-height: 1.4;
}
.study-detail-panel__stale svg {
  flex-shrink: 0;
  margin-top: 1px;
}
.study-detail-panel__header {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.study-detail-panel__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}
.study-detail-panel__doi {
  font-family: var(--font-mono, monospace);
  font-size: 11px;
  color: var(--text-secondary);
  word-break: break-all;
  line-height: 1.4;
  text-decoration: none;
}
.study-detail-panel__doi:hover {
  color: var(--text-primary);
  text-decoration: underline;
}
.study-detail-panel__section {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.study-detail-panel__section-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}
.study-detail-panel__meta-row {
  display: flex;
  flex-direction: column;
  gap: 1px;
  margin: 0;
  font-size: 11px;
}
.study-detail-panel__label {
  color: var(--text-dim);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.study-detail-panel__versions {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.study-detail-panel__version {
  font-size: 11px;
  display: flex;
  flex-direction: column;
  gap: 1px;
  padding: 6px 8px;
  border-radius: 4px;
  background: var(--bg-surface);
}
.study-detail-panel__version--latest {
  background: var(--accent-soft);
  border: 1px solid var(--border-accent);
}
.study-detail-panel__version-doi {
  color: var(--text-secondary);
  text-decoration: none;
  font-family: var(--font-mono, monospace);
  font-size: 10px;
  word-break: break-all;
}
.study-detail-panel__version-doi:hover {
  color: var(--text-primary);
  text-decoration: underline;
}
.study-detail-panel__version-date {
  color: var(--text-dim);
  font-size: 10px;
}
.study-detail-panel__version-date em {
  color: var(--accent);
  font-style: normal;
}
.study-detail-panel__actions {
  margin-top: 4px;
}

/* ── Sidebar Zenodo button ────────────────────────────────────────────────── */
.toolbar__tool--explorer.active,
.toolbar__tool--explorer:hover {
  color: #5b9cf6;
  background: rgba(91, 156, 246, 0.12);
  border-color: rgba(91, 156, 246, 0.3);
}
.toolbar__tool--explorer.active svg {
  filter: drop-shadow(0 0 4px rgba(91, 156, 246, 0.4));
}

.toolbar__tool--zenodo.active,
.toolbar__tool--zenodo:hover {
  color: var(--cyan);
  background: var(--cyan-soft);
  border-color: rgba(0, 200, 255, 0.3);
}
.toolbar__tool--zenodo.active svg {
  filter: drop-shadow(0 0 4px rgba(0, 200, 255, 0.4));
}

/* ── Activity Log (Logs tab) ─────────────────────────────────────────────── */
.activity-log-toolbar {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
}
.activity-log-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-items: center;
  min-width: 0;
}
.activity-log-toolbar-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.activity-filter-label {
  font-size: 11px;
  color: var(--text-dim);
  white-space: nowrap;
  margin-right: 2px;
}
.activity-filter-label--gap {
  margin-left: 8px;
}
.activity-export-btn {
  white-space: nowrap;
  font-size: 12px;
  padding: 3px 10px;
}
.activity-log-scroll {
  overflow-y: auto;
  flex: 1;
}
.activity-log-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 11px;
}
.activity-log-table th {
  padding: 6px 8px;
  text-align: left;
  font-size: 10px;
  font-weight: 600;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.activity-log__cell {
  padding: 5px 8px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.activity-log__row--expandable {
  cursor: pointer;
}
.activity-log__row--expandable:hover td {
  background: var(--bg-elevated);
}
.activity-log__action {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-dim);
  white-space: nowrap;
}
.activity-log__resource {
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text-dim);
  font-size: 10px;
}
.activity-log__detail-hint {
  color: var(--text-dim);
  font-size: 10px;
  width: 16px;
  text-align: center;
}
.activity-log__result {
  display: inline-block;
  padding: 1px 6px;
  border-radius: 10px;
  font-size: 10px;
  font-weight: 600;
}
.activity-log__result--success {
  background: var(--accent-soft);
  color: var(--accent);
}
.activity-log__result--error {
  background: var(--danger-soft);
  color: var(--danger);
}
.activity-log__detail-row td {
  padding: 0 8px 8px;
  background: var(--bg-base);
}
.activity-log__detail {
  background: var(--bg-base);
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 8px;
  overflow-x: auto;
  white-space: pre;
  margin: 0;
  border: 1px solid var(--border);
  border-radius: 4px;
  max-height: 160px;
}
.activity-log__pagination {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  justify-content: center;
  font-size: 12px;
  color: var(--text-dim);
}

/* ── US 1: Stack Slider & Controls ───────────────────────────────────────── */
.nav-slider {
  width: 110px;
  height: 4px;
  border-radius: 2px;
  accent-color: var(--accent);
  background: var(--bg-elevated);
  cursor: pointer;
}
.nav-slider:hover {
  accent-color: var(--cyan);
}

.toolbar__tool:disabled,
.toolbar__tool.disabled {
  opacity: 0.4;
  cursor: not-allowed !important;
  pointer-events: auto !important;
}

/* ── US 2 / UI-7: 3D View Unified Viewport Controls ─────────────────────── */
.cursor-crosshair {
  cursor: crosshair !important;
}

#view-3d-container,
.view-3d-container {
  position: absolute;
  inset: 0;
  z-index: 60;
  width: 100%;
  height: 100%;
  pointer-events: auto;
}

#view-3d-container.hidden,
.view-3d-container.hidden {
  display: none !important;
}

.view-3d-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  pointer-events: auto;
  touch-action: none;
}

/* Obsolete Depth Slider Capsule — Hidden permanently in favor of 3-axis panel */
.view-3d-depth-slider-wrap,
.mpr-depth-slider-wrap {
  display: none !important;
}

.view-3d-depth-counter,
.mpr-depth-counter {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--accent, #00b4d8);
  white-space: nowrap;
  writing-mode: horizontal-tb;
  transform: none;
  text-shadow: 0 0 4px rgba(0, 0, 0, 0.9);
}

.view-3d-depth-slider,
.mpr-depth-slider {
  writing-mode: horizontal-tb;
  direction: ltr;
  flex: 1;
  height: 6px;
  accent-color: var(--accent, #00b4d8);
  cursor: pointer;
  transition: opacity var(--transition, 0.15s ease);
}

.view-3d-depth-slider:hover,
.mpr-depth-slider:hover {
  filter: brightness(1.2);
}

/* Anatomical Reference Cube (3D Gizmo) */
#view-3d-reference-cube,
.view-3d-reference-cube,
#mpr-reference-cube {
  position: absolute;
  bottom: 72px;
  left: 20px;
  z-index: 100;
  pointer-events: auto;
  cursor: pointer;
  background: rgba(18, 18, 24, 0.75);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md, 8px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

/* ── 3D View Orientation Widget (Bottom-Right) ────────────────────────────── */
#view-3d-orientation-widget,
.view-3d-orientation-widget,
#mpr-orientation-widget,
.mpr-orientation-widget {
  display: none;
  position: absolute;
  bottom: 20px;
  right: 20px;
  background: rgba(18, 18, 24, 0.92);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-strong, #3f3f46);
  border-radius: var(--radius-md, 8px);
  padding: 4px;
  gap: 4px;
  z-index: 200;
  align-items: center;
  pointer-events: auto;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.6);
}

#viewport-container.mode-3d #view-3d-orientation-widget,
#viewport-container.mode-3d .view-3d-orientation-widget,
#viewport-container.mode-3d #mpr-orientation-widget,
#viewport-container.mode-3d .mpr-orientation-widget {
  display: flex;
}

.view-3d-btn,
.mpr-btn {
  background: transparent;
  color: var(--text-secondary, #a1a1aa);
  border: 1px solid transparent;
  padding: 6px 12px;
  border-radius: var(--radius-sm, 4px);
  cursor: pointer;
  font-size: 11px;
  font-weight: 500;
  transition: all var(--transition, 0.15s ease);
}

.btn-orient {
  padding: 6px 12px;
  font-size: 11px;
  font-weight: 600;
  border-radius: var(--radius-sm, 4px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary, #d4d4d8);
  cursor: pointer;
  transition: all var(--transition, 0.15s ease);
  user-select: none;
}

.btn-orient:hover,
.view-3d-btn:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.35);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

.btn-orient.active,
.view-3d-btn.active {
  background: var(--accent-soft, rgba(0, 180, 216, 0.2));
  color: var(--accent, #00b4d8);
  border-color: var(--accent, #00b4d8);
  box-shadow: 0 0 10px rgba(0, 180, 216, 0.3);
  font-weight: 700;
}

.btn-orient:focus-visible,
.view-3d-btn:focus-visible {
  outline: 2px solid var(--accent, #00b4d8);
  outline-offset: 1px;
}

.view-3d-gizmo-wrap,
.mpr-gizmo-wrap {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ── 3D View Tri-Planar Sliders Panel ─────────────────────────────────────── */
#view-3d-sliders-panel,
.view-3d-sliders-panel,
#mpr-sliders-panel,
.mpr-sliders-panel {
  display: none;
  position: absolute;
  top: 16px;
  right: 16px;
  background: rgba(18, 18, 24, 0.92);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-strong, #3f3f46);
  border-radius: var(--radius-md, 8px);
  padding: 12px 16px;
  gap: 10px;
  z-index: 999;
  pointer-events: auto;
  flex-direction: column;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.65);
}

#viewport-container.mode-3d #view-3d-sliders-panel,
#viewport-container.mode-3d .view-3d-sliders-panel,
#viewport-container.mode-3d #mpr-sliders-panel,
#viewport-container.mode-3d .mpr-sliders-panel,
#viewport-container.mode-mpr #view-3d-sliders-panel,
#viewport-container.mode-mpr .view-3d-sliders-panel,
#viewport-container.mode-mpr #mpr-sliders-panel,
#viewport-container.mode-mpr .mpr-sliders-panel {
  display: flex;
}

.view-3d-slider-row,
.mpr-slider-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.mpr-slider-label-group {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-width: 90px;
  gap: 8px;
}

.mpr-slider-val {
  font-family: var(--font-mono, monospace);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary, #d4d4d8);
  min-width: 24px;
  text-align: right;
}

.view-3d-slider-row label,
.mpr-slider-row label {
  font-size: 11px;
  font-weight: 700;
  font-family: var(--font-mono, monospace);
  min-width: 56px;
  letter-spacing: 0.5px;
}

/* Color coded anatomical axis labels matching 3D shader cut planes */
.view-3d-slider-row label[for="view-3d-scroll-axial"],
.view-3d-slider-row label[for="mpr-scroll-axial"],
.mpr-slider-row label[for="mpr-scroll-axial"],
.mpr-slider-row label[for="view-3d-scroll-axial"] {
  color: #38bdf8; /* Axial — Sky Blue */
}

.view-3d-slider-row label[for="view-3d-scroll-coronal"],
.view-3d-slider-row label[for="mpr-scroll-coronal"],
.mpr-slider-row label[for="mpr-scroll-coronal"],
.mpr-slider-row label[for="view-3d-scroll-coronal"] {
  color: #34d399; /* Coronal — Emerald Green */
}

.view-3d-slider-row label[for="view-3d-scroll-sagittal"],
.view-3d-slider-row label[for="mpr-scroll-sagittal"],
.mpr-slider-row label[for="mpr-scroll-sagittal"],
.mpr-slider-row label[for="view-3d-scroll-sagittal"] {
  color: #f87171; /* Sagittal — Coral Red */
}

.view-3d-slider-row input[type="range"],
.mpr-slider-row input[type="range"] {
  width: 130px;
  accent-color: var(--accent, #00b4d8);
  cursor: pointer;
  transition: opacity var(--transition, 0.15s ease);
}

.view-3d-slider-row input[type="range"]:hover,
.mpr-slider-row input[type="range"]:hover {
  filter: brightness(1.2);
}

/* ── Toolbar Popovers (Layers, etc.) ──────────────────────────────────────── */
.toolbar-popover {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 100;
  width: 280px;
  background: var(--bg-surface, #18181b);
  border: 1px solid var(--border-strong, #27272a);
  border-radius: var(--radius-md, 8px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.toolbar-popover.hidden {
  display: none !important;
}

.popover-header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border, #27272a);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.popover-body {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.popover-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
}

/* ── Admin users panel (US-H04) ──────────────────────────────────────────── */
.users-toolbar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 0.75rem;
}
.user-create {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1rem;
}
.user-create__fields {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: flex-end;
}
.user-create__field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.85rem;
}
.user-create__field input,
.user-create__field select {
  padding: 0.4rem 0.5rem;
  background: var(--bg-base);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 13px;
  outline: none;
  transition: border-color var(--transition);
}
.user-create__field input:focus,
.user-create__field select:focus {
  border-color: var(--accent);
}
.user-create__field select option {
  background: var(--bg-elevated);
}
.form-error {
  color: var(--danger);
  font-size: 0.85rem;
  margin: 0.25rem 0 0;
}
.users-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.users-table th,
.users-table td {
  text-align: left;
  padding: 0.5rem 0.6rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.users-table th {
  font-weight: 600;
  white-space: nowrap;
  color: var(--text-muted);
  font-size: 12px;
}
.user-actions {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}
.user-empty td {
  text-align: center;
  color: var(--text-muted);
  padding: 1.25rem;
}
.user-status {
  display: inline-block;
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  font-size: 0.78rem;
  border: 1px solid transparent;
}
.user-status--active {
  color: var(--accent);
  border-color: var(--border-accent);
  background: var(--accent-soft);
}
.user-status--invited {
  color: var(--amber);
  border-color: rgba(224, 164, 88, 0.4);
  background: var(--amber-soft);
}
.user-status--blocked {
  color: var(--danger);
  border-color: rgba(255, 107, 107, 0.4);
  background: var(--danger-soft);
}

/* ── System panel ────────────────────────────────────────────────────────── */
.sys-section {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
  max-width: 480px;
}
.sys-section__label {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.sys-alert {
  font-size: 11px;
  color: var(--danger);
  background: var(--danger-soft);
  border: 1px solid rgba(255, 107, 107, 0.4);
  border-radius: 4px;
  padding: 6px 10px;
  margin-bottom: 10px;
}
.sys-storage {
  margin-bottom: 12px;
}
.sys-storage__track {
  height: 8px;
  background: var(--bg-base);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 4px;
}
.sys-storage__fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.4s ease;
}
.sys-storage__labels {
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}
.sys-storage__bar--alert .sys-storage__labels {
  color: var(--danger);
}
.sys-storage__labels--only {
  flex-direction: column;
  gap: 2px;
}
.sys-storage__hint {
  font-size: 9px;
  opacity: 0.6;
}
.sys-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-top: 12px;
}
.sys-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--bg-base);
  border-radius: var(--radius-sm);
  padding: 8px 4px;
  gap: 2px;
}
.sys-stat__value {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  font-family: var(--font-mono);
}
.sys-stat__label {
  font-size: 9px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.sys-error {
  font-size: 12px;
  color: var(--text-muted);
  padding: 12px 0;
}
.sys-skeleton {
  background: var(--bg-elevated);
  border-radius: 4px;
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}
.sys-skeleton--bar {
  height: 8px;
  width: 100%;
  margin-bottom: 6px;
}
.sys-skeleton--sm {
  height: 10px;
  width: 60%;
}

/* ── Walkthrough / guided tour (TK-27) ─────────────────────────────────────── */
/* An in-house follow-along tour: a dimmer built from four scrim rectangles that
   leave a cut-out over the spotlit element (so the real control stays clickable),
   an outline ring, and a focus-trapped popover. walkthrough/overlay.ts sets the
   geometry inline; this owns the look. */
.walkthrough {
  position: fixed;
  inset: 0;
  z-index: 1000;
  pointer-events: none; /* only the scrims and the popover capture input */
}
.walkthrough__scrim {
  position: fixed;
  background: rgba(0, 0, 0, 0.6);
  pointer-events: auto; /* clicks on the dimmed area are swallowed */
}
.walkthrough__ring {
  position: fixed;
  border: 2px solid var(--accent);
  border-radius: var(--radius-sm);
  box-shadow: 0 0 0 4px var(--accent-glow);
  pointer-events: none;
  transition:
    top var(--transition),
    left var(--transition),
    width var(--transition),
    height var(--transition);
}
.walkthrough__popover {
  position: fixed;
  width: min(360px, calc(100vw - 32px));
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
  padding: 18px 18px 14px;
  color: var(--text-primary);
  font-family: var(--font);
  pointer-events: auto;
  transition:
    top var(--transition),
    left var(--transition);
}
.walkthrough__progress {
  font-size: 12px;
  color: var(--text-muted);
  margin: 0 0 6px;
}
.walkthrough__title {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 6px;
}
.walkthrough__body {
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-secondary);
  margin: 0 0 14px;
}
.walkthrough__controls {
  display: flex;
  align-items: center;
  gap: 8px;
}
.walkthrough__spacer {
  flex: 1;
}
.walkthrough__btn {
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
  transition: background var(--transition);
}
.walkthrough__btn:hover {
  background: var(--bg-hover);
}
.walkthrough__btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}
.walkthrough__btn--primary:hover {
  background: var(--accent-dim);
}
.walkthrough__btn--skip {
  border-color: transparent;
  color: var(--text-muted);
}
.walkthrough__close {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border: none;
  background: transparent;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 20px;
  line-height: 1;
}
.walkthrough__close:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}
/* The engine also honours prefers-reduced-motion via this class, so a runtime
   toggle (not just the media query) can suppress the tween. */
.walkthrough--reduced .walkthrough__ring,
.walkthrough--reduced .walkthrough__popover {
  transition: none;
}

/* ── Validations panel (US-26) ───────────────────────────────────────────── */

.validations-panel {
  background: var(--bg-elevated);
  padding-left: 20px;
}

.validations-filters {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.validations-chip {
  padding: 5px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: none;
  color: var(--text-secondary);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}
.validations-chip:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
}
.validations-chip--active {
  background: var(--amber-soft);
  color: var(--amber);
  border-color: transparent;
}

.validations-table-wrap {
  overflow-x: auto;
}

.validations-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.validations-table th {
  color: var(--text-muted);
  font-weight: 500;
  font-family: var(--font);
  text-align: left;
  padding: 6px 12px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.validations-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
  color: var(--text-primary);
}
.validations-table tbody tr:last-child td {
  border-bottom: none;
}
.validations-table tbody tr:hover td {
  background: var(--bg-hover);
}

.validation-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-weight: 600;
  white-space: nowrap;
}
.validation-badge--approved {
  background: var(--accent-soft);
  color: var(--accent);
}
.validation-badge--rejected {
  background: var(--danger-soft);
  color: var(--danger);
}
.validation-badge--review {
  background: var(--amber-soft);
  color: var(--amber);
}
.validation-badge--none {
  color: var(--text-dim);
  font-style: italic;
}

/* Validation status chip in study cards (Buscar / explorer panel) */
.study-item__validation-badge {
  display: inline-flex;
  align-items: center;
  padding: 1px 5px;
  border-radius: 999px;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.03em;
  white-space: nowrap;
}
.study-item__validation-badge--approved {
  background: var(--accent-soft);
  color: var(--accent);
}
.study-item__validation-badge--rejected {
  background: var(--danger-soft);
  color: var(--danger);
}
.study-item__validation-badge--review {
  background: var(--amber-soft);
  color: var(--amber);
}
.study-item__classification-badge {
  display: inline-flex;
  align-items: center;
  padding: 1px 5px;
  border-radius: 999px;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.03em;
  white-space: nowrap;
  background: var(--border);
  color: var(--text-secondary);
}
.study-item__classification-badge--none {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
  font-weight: 600;
}

.validations-row-actions {
  display: flex;
  gap: 6px;
  align-items: center;
}

.validation-ml-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 7px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  white-space: nowrap;
}
.validation-ml-badge--done {
  background: color-mix(in srgb, var(--accent) 15%, transparent);
  color: var(--accent);
}

.validations-empty,
.validations-error {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
  font-size: 14px;
}
.validations-error {
  color: var(--danger);
}

/* ── Validation bar (viewer) ──────────────────────────────────────────────── */
.validation-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: rgba(13, 15, 17, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

/* Push the viewport up by the bar's height so image content is never hidden. */
.main-content:has(.validation-bar:not(.hidden)) .viewport-wrapper {
  padding-bottom: 46px;
}

.validation-bar__status {
  font-size: 12px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid;
  white-space: nowrap;
  flex-shrink: 0;
}
.validation-bar__status--none {
  color: var(--text-muted);
  border-color: var(--border-strong);
  background: transparent;
}
.validation-bar__status--approved {
  color: var(--accent);
  border-color: var(--border-accent);
  background: var(--accent-soft);
}
.validation-bar__status--rejected {
  color: var(--danger);
  border-color: rgba(255, 107, 107, 0.4);
  background: var(--danger-soft);
}
.validation-bar__status--review {
  color: var(--amber);
  border-color: rgba(224, 164, 88, 0.4);
  background: var(--amber-soft);
}

.validation-bar__correction-notice {
  font-size: 11px;
  color: var(--amber);
  flex: 1;
  margin: 0;
}
.validation-bar__readonly-notice {
  font-size: 11px;
  color: var(--text-dim);
  flex: 1;
  margin: 0;
}

/* ── Segmentation group (US-45) ───────────────────────────────────────────── */
/* Small turquoise "IA" chip that tags the segmentation as machine-made. */
.validation-bar__chip {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 2px 8px;
  border-radius: 999px;
  color: #1abc9c;
  border: 1px solid rgba(26, 188, 156, 0.5);
  background: rgba(26, 188, 156, 0.12);
  white-space: nowrap;
  flex-shrink: 0;
}
/* Attribution text ("Segmentado por IA" / "Corregido por…"). Without this rule
   the span inherited 13px and dwarfed the rest of the bar. */
.validation-bar__seg-attr {
  font-size: 11px;
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 42ch;
}
/* Pushes the action buttons to the right so the bar reads: chip · text … actions. */
.validation-bar__spacer {
  flex: 1 1 auto;
}

/* ── Dialog fields (textarea, label, notes) ───────────────────────────────── */
.dialog__field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.dialog__field label,
.dialog__label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}
.dialog__textarea {
  background: var(--bg-base);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 13px;
  line-height: 1.5;
  padding: 8px 12px;
  width: 100%;
  resize: vertical;
  outline: none;
  transition:
    border-color var(--transition),
    box-shadow var(--transition);
}
.dialog__textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.dialog__textarea::placeholder {
  color: var(--text-muted);
}
.dialog__field-note,
.dialog__error {
  font-size: 12px;
  color: var(--amber);
  margin: 0;
}
.dialog__error {
  color: var(--danger);
}
.dialog__body {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ── Segmentación con IA (mock SAM3) ──────────────────────────────────────── */
/* Turquesa propio de la capa de segmentación: el esmeralda --accent ya
   identifica las mediciones calibradas, y ambas capas pueden convivir en el
   mismo viewport. Contraste del turquesa sobre #09090b: 8.4:1. */
:root {
  --segmentation: #1abc9c;
  --segmentation-soft: rgba(26, 188, 156, 0.14);
  --segmentation-border: rgba(26, 188, 156, 0.4);
}

/* Botón del visor que muestra u oculta la segmentación ya calculada. */
.toolbar__tool--ai.active,
.toolbar__tool--ai:hover:not(:disabled) {
  color: var(--segmentation);
  background: var(--segmentation-soft);
  border-color: var(--segmentation-border);
}
.toolbar__tool--ai.active svg {
  filter: drop-shadow(0 0 4px var(--segmentation-border));
}

/* Acción de segmentación en la fila de Validaciones. Turquesa apagado: es una
   acción secundaria dentro de la tabla, no la principal. */
.btn--ai {
  border-color: var(--segmentation-border);
  color: var(--segmentation);
}
.btn--ai:hover:not(:disabled) {
  background: var(--segmentation-soft);
  border-color: var(--segmentation);
}

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

.segmentation-status {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(18, 18, 24, 0.92);
  border: 1px solid var(--segmentation-border);
  color: var(--segmentation);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.01em;
  pointer-events: none;
}
.segmentation-status::before {
  content: "";
  width: 12px;
  height: 12px;
  border: 2px solid var(--segmentation-border);
  border-top-color: var(--segmentation);
  border-radius: 50%;
  animation: segmentation-spin 0.8s linear infinite;
}
@media (prefers-reduced-motion: reduce) {
  .segmentation-status::before {
    animation: none;
  }
}

/* El resultado no viene de un modelo real: el aviso queda permanentemente a la
   vista mientras la capa esté encendida, no como un toast que se desvanece. */
.segmentation-badge {
  position: absolute;
  top: 12px;
  right: 16px;
  z-index: 30;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--amber-soft);
  border: 1px solid var(--amber);
  color: var(--amber);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  pointer-events: none;
}

.popover-check {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
}
.popover-check:has(.popover-check__input:disabled) {
  opacity: 0.5;
  cursor: not-allowed;
}
.popover-check__input {
  accent-color: var(--segmentation);
  width: 14px;
  height: 14px;
  cursor: inherit;
}
/* Muestra de color: enseña qué overlay conmuta la casilla. */
.popover-check__swatch {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  border: 2px solid var(--segmentation);
  background: var(--segmentation-soft);
  flex: none;
}

/* Classify-before-upload dialog field. */
.classify-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 4px 0 16px;
  font-size: 13px;
  color: var(--text-secondary);
}
.classify-field select {
  padding: 8px 10px;
  background: var(--bg-base);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition);
}
.classify-field select:focus-visible {
  border-color: var(--accent);
}
.classify-field select option {
  background: var(--bg-elevated);
}