.app-shell {
  display: grid;
  grid-template-rows:
    var(--header-height)
    auto
    minmax(0, 1fr)
    var(--footer-height);

  width: 100%;
  height: 100vh;
  max-width: var(--content-max-width);
  margin: 0 auto;
  overflow: hidden;
}

/* Header */

.app-header {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(240px, 1fr) minmax(280px, 1fr);
  align-items: center;
  gap: var(--space-5);
  padding: 0 var(--space-6);

  background:
    linear-gradient(
      90deg,
      rgba(215, 168, 75, 0.05),
      transparent 28%,
      transparent 72%,
      rgba(114, 150, 199, 0.05)
    ),
    rgba(10, 15, 23, 0.96);

  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-small);
  z-index: 10;
}

.brand-area {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;

  width: 50px;
  height: 50px;

  border: 1px solid var(--color-primary);
  border-radius: var(--radius-medium);

  background:
    linear-gradient(
      145deg,
      rgba(215, 168, 75, 0.22),
      rgba(215, 168, 75, 0.05)
    );

  color: var(--color-primary);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  box-shadow:
    inset 0 0 18px rgba(215, 168, 75, 0.08),
    0 0 22px rgba(215, 168, 75, 0.08);
}

.brand-copy {
  min-width: 0;
}
.brand-title-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
}
.private-beta-badge {
  flex: 0 0 auto;
  padding: 3px 7px;

  border: 1px solid rgba(215, 168, 75, 0.55);
  border-radius: 999px;

  background: rgba(215, 168, 75, 0.12);
  color: var(--color-primary);

  font-size: 0.6rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  line-height: 1;
  text-transform: uppercase;
}
.brand-copy h1 {
  margin-bottom: 3px;
  overflow: hidden;
  color: var(--color-text);
  font-size: clamp(1rem, 1.35vw, 1.35rem);
  font-weight: 700;
  letter-spacing: 0.015em;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.brand-copy p {
  margin-bottom: 0;
  color: var(--color-text-muted);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.header-center {
  display: flex;
  justify-content: center;
  min-width: 0;
}

.case-indicator,
.judge-indicator {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.case-indicator {
  align-items: center;
  text-align: center;
}

.case-indicator strong,
.judge-indicator strong {
  max-width: 100%;
  overflow: hidden;
  color: var(--color-text);
  font-size: 0.88rem;
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.indicator-label {
  margin-bottom: 3px;
  color: var(--color-text-muted);
  font-size: 0.63rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.header-actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: var(--space-4);
  min-width: 0;
}

.judge-indicator {
  align-items: flex-end;
  text-align: right;
}

/* Navigation */

.primary-navigation {
  display: flex;
  align-items: stretch;
  gap: 2px;
  padding: 0 var(--space-6);

  background: rgba(13, 19, 29, 0.96);
  border-bottom: 1px solid var(--color-border);
}

.nav-tab {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;

  min-width: 145px;
  padding: 0 var(--space-5);

  background: transparent;
  color: var(--color-text-secondary);

  font-size: 0.8rem;
  font-weight: 650;
  letter-spacing: 0.025em;

  transition:
    background-color 160ms ease,
    color 160ms ease;
}

.nav-tab::after {
  content: "";
  position: absolute;
  right: var(--space-4);
  bottom: 0;
  left: var(--space-4);

  height: 2px;
  border-radius: var(--radius-pill);

  background: transparent;
  transform: scaleX(0.5);
  transition:
    background-color 160ms ease,
    transform 160ms ease;
}

.nav-tab:hover {
  background: rgba(255, 255, 255, 0.025);
  color: var(--color-text);
}

.nav-tab.is-active {
  background: var(--color-primary-muted);
  color: var(--color-primary);
}

.nav-tab.is-active::after {
  background: var(--color-primary);
  transform: scaleX(1);
}

/* Main workspace */

.app-workspace {
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  padding: var(--space-5) var(--space-6);

  background:
    linear-gradient(
      rgba(255, 255, 255, 0.012) 1px,
      transparent 1px
    ),
    linear-gradient(
      90deg,
      rgba(255, 255, 255, 0.012) 1px,
      transparent 1px
    );

  background-size: 32px 32px;
}
/* Private Beta storage notice */

html[data-environment="private-beta"] .app-workspace {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: var(--space-3);
}

html[data-environment="private-beta"]
.app-workspace > .app-view {
  height: auto;
}

.beta-storage-notice {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;

  min-width: 0;
  min-height: 28px;
  padding: 4px 12px;

  background:
    linear-gradient(
      90deg,
      rgba(215, 168, 75, 0.1),
      rgba(20, 27, 39, 0.96)
    );

  border: 1px solid rgba(215, 168, 75, 0.32);
  border-radius: var(--radius-medium);

  color: var(--color-text-secondary);
  font-size: 0.68rem;
  line-height: 1.2;
  text-align: center;
}

.beta-storage-notice strong {
  flex: 0 0 auto;
  color: var(--color-primary);
}

.beta-storage-notice[hidden] {
  display: none;
}

@media (max-width: 900px) {
  .beta-storage-notice {
    align-items: flex-start;
    min-height: 42px;
    text-align: left;
  }
}

.app-view {
  width: 100%;
  height: 100%;
  min-width: 0;
  min-height: 0;
}

.app-view.is-active {
  display: flex;
  flex-direction: column;
}

.app-view[hidden] {
  display: none;
}

.view-heading {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);

  min-height: 56px;
  margin-bottom: var(--space-4);
}

.view-heading h2 {
  margin-bottom: 0;
  color: var(--color-text);
  font-size: clamp(1.35rem, 1.8vw, 1.8rem);
  font-weight: 700;
  letter-spacing: -0.025em;
}

.eyebrow {
  margin-bottom: 4px;
  color: var(--color-primary);
  font-size: 0.64rem;
  font-weight: 750;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

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

/* Workspace grid */

.workspace-grid {
  display: grid;
  grid-template-columns: minmax(0, 2.3fr) minmax(280px, 0.8fr);
  gap: var(--space-4);

  flex: 1 1 auto;
  min-width: 0;
  min-height: 0;
}

.panel,
.placeholder-panel {
  min-width: 0;
  min-height: 0;
  overflow: hidden;

  background:
    linear-gradient(
      145deg,
      rgba(255, 255, 255, 0.022),
      transparent 42%
    ),
    var(--color-surface);

  border: 1px solid var(--color-border);
  border-radius: var(--radius-large);
  box-shadow: var(--shadow-small);
}

.panel {
  display: flex;
  flex-direction: column;
  padding: var(--space-5);
}

.panel-large {
  position: relative;
}

.panel-header {
  display: flex;
  flex: 0 0 auto;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);

  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.panel-header h3 {
  margin-bottom: 0;
  font-size: 1rem;
  font-weight: 650;
}

.panel-kicker {
  margin-bottom: 3px;
  color: var(--color-text-muted);
  font-size: 0.62rem;
  font-weight: 750;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.empty-state {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  align-items: center;
  justify-content: center;

  min-height: 0;
  padding: var(--space-7);
  text-align: center;
}

.empty-state-icon {
  display: grid;
  place-items: center;

  width: 64px;
  height: 64px;
  margin-bottom: var(--space-5);

  border: 1px solid var(--color-border-light);
  border-radius: 50%;

  background: var(--color-primary-muted);
  color: var(--color-primary);

  font-family: Georgia, serif;
  font-size: 1.8rem;
  box-shadow: inset 0 0 24px rgba(215, 168, 75, 0.07);
}

.empty-state h4 {
  margin-bottom: var(--space-2);
  font-size: 1rem;
  font-weight: 650;
}

.empty-state p {
  max-width: 420px;
  margin-bottom: 0;
  color: var(--color-text-muted);
  font-size: 0.84rem;
  line-height: 1.55;
}

.quick-action-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding-top: var(--space-4);
}

/* Placeholder modules */

.placeholder-panel {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  align-items: center;
  justify-content: center;

  padding: var(--space-7);
  text-align: center;
}

.placeholder-number {
  margin-bottom: var(--space-3);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
}

.placeholder-panel h3 {
  margin-bottom: var(--space-2);
  font-size: 1.2rem;
}

.placeholder-panel p {
  margin-bottom: 0;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

/* Footer */

.app-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;

  padding: 0 var(--space-6);

  background: rgba(9, 14, 21, 0.98);
  border-top: 1px solid var(--color-border);

  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
}
.footer-build {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.build-identifier {
  color: var(--color-primary);
}
.footer-status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;

  background: var(--color-success);
  box-shadow: 0 0 8px rgba(99, 197, 141, 0.45);
}

/* Modal layer */

.modal-layer {
  position: fixed;
  inset: 0;
  z-index: 100;

  display: none;
  place-items: center;
  padding: var(--space-6);

  background: rgba(2, 5, 10, 0.74);
  backdrop-filter: blur(6px);
}

.modal-layer.is-open {
  display: grid;
}

/* Tablet scaling */

@media (max-width: 1050px) {
  :root {
    --header-height: 70px;
  }

  .app-header {
    grid-template-columns: minmax(220px, 1fr) minmax(180px, 0.8fr) minmax(220px, 1fr);
    padding-right: var(--space-4);
    padding-left: var(--space-4);
  }

  .primary-navigation {
    padding-right: var(--space-4);
    padding-left: var(--space-4);
  }

  .nav-tab {
    min-width: 0;
    flex: 1 1 0;
    padding-right: var(--space-3);
    padding-left: var(--space-3);
    font-size: 0.72rem;
  }

  .app-workspace {
    padding: var(--space-4);
  }

  .workspace-grid {
    grid-template-columns: minmax(0, 1.65fr) minmax(240px, 0.8fr);
  }
}

@media (max-width: 760px) {
  body {
    overflow: auto;
  }

  .app-shell {
    height: auto;
    min-height: 100vh;
    overflow: visible;
  }

  .app-header {
    grid-template-columns: 1fr auto;
  }

  .header-center {
    display: none;
  }

  .brand-copy p {
    display: none;
  }

  .judge-indicator {
    display: flex;
    max-width: 120px;
  }

  .judge-indicator strong {
    font-size: .72rem;
  }

  .primary-navigation {
    overflow-x: auto;
  }

  .nav-tab {
    flex: 0 0 auto;
    min-width: 130px;
  }

  .app-workspace {
    min-height: calc(
      100vh -
      var(--header-height) -
      var(--navigation-height) -
      var(--footer-height)
    );

    overflow: visible;
  }

  .workspace-grid {
    grid-template-columns: 1fr;
  }

  .panel {
    min-height: 300px;
  }
}
/* Sprint 2: Case Workspace panel layout */

.workspace-main-column {
  display: grid;
 grid-template-rows:
  auto
  auto
  minmax(240px, 1fr);
  gap: var(--space-3);

  min-width: 0;
  min-height: 0;
  overflow: hidden;
}

.workspace-main-column > .panel {
  min-width: 0;
  min-height: 0;
}

.panel-body {
  flex: 1 1 auto;
  min-width: 0;
  min-height: 0;
  padding-top: var(--space-3);
  overflow: hidden;
}

@media (max-width: 1050px) {
  .workspace-main-column {
    grid-template-rows:
      auto
      auto
      minmax(240px, 1fr);
  }
}

@media (max-width: 760px) {
  .workspace-main-column {
    display: flex;
    flex-direction: column;
  }

  .panel-body {
    overflow: visible;
  }
}
/* Sprint 2: Workspace sidebar */

.workspace-sidebar {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-auto-rows: max-content;
  align-content: start;
  gap: var(--space-4);

  min-width: 0;
  min-height: 0;
  padding-right: 2px;

  overflow-x: hidden;
  overflow-y: auto;
}

.workspace-sidebar > .panel {
  align-self: start;

  width: 100%;
  height: auto;
  min-width: 0;
  min-height: 0;
}

/*
 * Sidebar panels should size themselves to their
 * actual content instead of filling unused row space.
 */

.workspace-sidebar > .panel .panel-body {
  flex: 0 0 auto;
}

/*
 * Shorter desktop windows may scroll each workspace
 * column independently without stretching panels.
 */

@media (max-height: 850px) and (min-width: 761px) {
  .workspace-main-column {
    padding-right: 2px;
    overflow-y: auto;
  }
}

/* Stacked tablet and mobile layout */

@media (max-width: 760px) {
  .workspace-sidebar {
    display: flex;
    flex-direction: column;

    padding-right: 0;
    overflow: visible;
  }

  .workspace-sidebar > .panel {
    height: auto;
  }

  .workspace-sidebar > .panel .panel-body {
    flex: 1 1 auto;
  }
}
/* Sprint 9: Responsive beta navigation and tablet layout */

.primary-navigation {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: stretch;
  gap: var(--space-3);
  padding-right: var(--space-4);
  padding-left: var(--space-4);
}

.navigation-tabs {
  display: flex;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: thin;
}

.navigation-tabs .nav-tab {
  flex: 1 1 0;
  min-width: 112px;
}

.navigation-quick-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 7px;
  min-width: 0;
}

.navigation-action-button,
.navigation-quick-actions .dry-run-entry-button {
  min-height: 30px;
  padding-inline: 11px;
  white-space: nowrap;
  font-size: 0.68rem;
}

.training-entry-label-short,
.feedback-label-short {
  display: none;
}

@media (max-width: 1050px) {
  .app-header {
    grid-template-columns:
      minmax(205px, 1fr)
      minmax(180px, 0.85fr)
      minmax(220px, auto);
    gap: var(--space-3);
  }

  .navigation-tabs .nav-tab {
    min-width: 96px;
    padding-right: 9px;
    padding-left: 9px;
    font-size: 0.68rem;
  }

  .navigation-action-button,
  .navigation-quick-actions .dry-run-entry-button {
    padding-inline: 9px;
    font-size: 0.64rem;
  }
}

@media (max-width: 900px) {
  :root {
    --header-height: 68px;
  }

  body {
    overflow: auto;
  }

  .app-shell {
    height: auto;
    min-height: 100vh;
    overflow: visible;
  }

  .app-header {
    grid-template-columns:
      minmax(180px, 1fr)
      minmax(170px, 0.9fr)
      auto;
    gap: 10px;
    padding-right: 12px;
    padding-left: 12px;
  }

  .brand-area {
    gap: 10px;
  }

  .brand-mark {
    width: 44px;
    height: 44px;
    font-size: 0.68rem;
  }

  .brand-copy p {
    display: none;
  }

  .brand-copy h1 {
    font-size: 0.94rem;
  }

  .brand-title-row {
    gap: 7px;
  }

  .private-beta-badge {
    padding: 3px 6px;
    font-size: 0.52rem;
  }

  .header-actions {
    gap: 8px;
  }

  .indicator-label {
    font-size: 0.56rem;
  }

  .case-indicator strong,
  .judge-indicator strong {
    font-size: 0.76rem;
  }

  .feedback-label-full {
    display: none;
  }

  .feedback-label-short {
    display: inline;
  }

  .primary-navigation {
    gap: 8px;
    padding-right: 10px;
    padding-left: 10px;
  }

  .navigation-tabs {
    scroll-snap-type: x proximity;
  }

  .navigation-tabs .nav-tab {
    flex: 0 0 auto;
    min-width: 112px;
    scroll-snap-align: start;
  }

  .navigation-quick-actions {
    gap: 5px;
  }

  .navigation-action-button,
  .navigation-quick-actions .dry-run-entry-button {
    padding-inline: 8px;
    font-size: 0.61rem;
  }

  .training-entry-label-full {
    display: none;
  }

  .training-entry-label-short {
    display: inline;
  }

  .app-workspace {
    min-height: calc(
      100vh -
      var(--header-height) -
      var(--navigation-height) -
      var(--footer-height)
    );
    overflow: visible;
    padding: 12px;
  }

  html[data-environment="private-beta"] .app-workspace {
    grid-template-rows: auto auto;
  }

  .app-view,
  html[data-environment="private-beta"]
  .app-workspace > .app-view {
    height: auto;
  }

  .workspace-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .workspace-main-column {
    display: flex;
    flex-direction: column;
    overflow: visible;
  }

  .workspace-sidebar {
    display: flex;
    flex-direction: column;
    padding-right: 0;
    overflow: visible;
  }

  .workspace-sidebar > .panel,
  .workspace-sidebar > .panel .panel-body {
    height: auto;
  }

  .panel-body {
    overflow: visible;
  }

  .panel {
    min-height: 0;
  }

  .beta-storage-notice {
    min-height: 0;
    padding: 6px 10px;
    font-size: 0.64rem;
  }
}

@media (max-width: 820px) {
  .judge-indicator {
    display: flex;
    max-width: 110px;
  }

  .app-header {
    grid-template-columns:
      minmax(185px, 1fr)
      minmax(170px, 0.9fr)
      auto;
  }
}

/* Sprint 9: Tablet navigation rows */

@media (max-width: 900px) {
  .app-shell {
    grid-template-rows:
      var(--header-height)
      auto
      minmax(0, 1fr)
      var(--footer-height);
  }

  body.is-dry-run .app-shell {
    grid-template-rows:
      var(--header-height)
      auto
      auto
      minmax(0, 1fr)
      var(--footer-height);
  }

  .primary-navigation {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto auto;
    gap: 0;

    height: auto;
    min-height: 86px;
    padding: 0 10px 6px;
    overflow: visible;
  }

  .navigation-tabs {
    width: 100%;
    min-width: 0;
    overflow-x: auto;
    overflow-y: hidden;

  border-bottom: 1px solid var(--color-border);
  min-height: var(--navigation-height);
}

  .navigation-tabs .nav-tab {
    flex: 1 1 0;
    min-width: 104px;
    padding-right: 8px;
    padding-left: 8px;
  }

  .navigation-quick-actions {
    width: 100%;
    min-width: 0;
    padding-top: 5px;
  }

  .app-workspace {
    min-height: 0;
  }
}

@media (max-width: 620px) {
  .navigation-tabs .nav-tab {
    flex: 0 0 auto;
    min-width: 120px;
  }
}