/* Glass navigation, tiles, panels, buttons, forms and sheets */

/* ---------- Frosted glass (shared by every floating element) ---------- */

.glass,
.tile,
.panel,
.chip,
.empty-state,
.button.is-glass,
.button.is-danger,
.icon-button {
  border: 1px solid var(--glass-border);
  background: var(--glass-fill);
  box-shadow: var(--glass-shadow), var(--glass-highlight);
  -webkit-backdrop-filter: blur(var(--blur-glass)) saturate(var(--glass-saturate));
  backdrop-filter: blur(var(--blur-glass)) saturate(var(--glass-saturate));
}

/* ---------- App navigation: floating tab bar on phones, floating sidebar on wide screens ---------- */

.app-nav {
  position: fixed;
  z-index: 20;
  left: calc(var(--tabbar-gap) + env(safe-area-inset-left));
  right: calc(var(--tabbar-gap) + env(safe-area-inset-right));
  bottom: max(var(--tabbar-gap), env(safe-area-inset-bottom));
  display: flex;
  gap: var(--space-1);
  height: var(--tabbar-height);
  padding: 6px;
  border-radius: var(--radius-xl);
  background: var(--glass-fill-strong);
  box-shadow: var(--glass-shadow-raised), var(--glass-highlight);
  -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(var(--glass-saturate));
  backdrop-filter: blur(var(--blur-strong)) saturate(var(--glass-saturate));
}

.app-nav-brand {
  display: none;
}

.app-nav-link {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  border-radius: calc(var(--radius-xl) - 6px);
  color: var(--color-text-secondary);
  font-size: var(--font-size-tab);
  font-weight: 600;
  text-decoration: none;
  transition: color var(--duration-fast), background-color var(--duration-fast);
}

.app-nav-link svg {
  width: 24px;
  height: 24px;
}

.app-nav-link[aria-current="page"] {
  background: var(--color-accent-soft);
  color: var(--color-accent);
}

@media (min-width: 900px) {
  .app-nav {
    top: var(--sidebar-gap);
    right: auto;
    bottom: var(--sidebar-gap);
    left: calc(var(--sidebar-gap) + env(safe-area-inset-left));
    width: var(--sidebar-width);
    height: auto;
    flex-direction: column;
    padding: var(--space-5) var(--space-3);
  }

  .app-nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: 0 var(--space-2) var(--space-5);
    font-family: var(--font-display);
    font-size: var(--font-size-title);
    font-weight: 800;
    letter-spacing: -0.01em;
  }

  .app-nav-logo {
    display: grid;
    place-items: center;
    width: 38px;
    height: 38px;
    border-radius: var(--radius-s);
    background: var(--gradient-accent);
    box-shadow: var(--shadow-accent);
    color: var(--color-on-accent);
  }

  .app-nav-logo svg {
    width: 22px;
    height: 22px;
  }

  .app-nav-link {
    flex: none;
    flex-direction: row;
    justify-content: flex-start;
    gap: var(--space-3);
    min-height: 46px;
    padding: 0 var(--space-4);
    border-radius: var(--radius-m);
    color: var(--color-text);
    font-size: var(--font-size-subhead);
    font-weight: 600;
  }

  .app-nav-link svg {
    width: 22px;
    height: 22px;
    color: var(--color-text-secondary);
  }

  .app-nav-link[aria-current="page"] {
    background: var(--gradient-accent);
    box-shadow: var(--shadow-accent);
    color: var(--color-on-accent);
  }

  .app-nav-link[aria-current="page"] svg {
    color: var(--color-on-accent);
  }
}

@media (min-width: 900px) and (hover: hover) {
  .app-nav-link:not([aria-current]):hover {
    background: var(--color-row-hover);
  }
}

/* ---------- Top bar: back button, actions, and a small title once scrolled ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  padding: calc(env(safe-area-inset-top) + var(--space-2)) calc(var(--gutter) + env(safe-area-inset-right)) 0
    calc(var(--gutter) + env(safe-area-inset-left));
}

.topbar-inner {
  display: grid;
  /* The back button keeps its width (up to a limit) and the small title gets
     the rest, so a long page title can never squeeze the back button away */
  grid-template-columns: minmax(0, max-content) minmax(0, 1fr) minmax(0, max-content);
  align-items: center;
  gap: var(--space-2);
  min-height: var(--topbar-height);
  max-width: calc(var(--content-width) - 2 * var(--gutter));
  margin: 0 auto;
  padding: 4px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  transition: background-color var(--duration-fast), box-shadow var(--duration-fast), border-color var(--duration-fast);
}

.topbar.is-compact .topbar-inner {
  border-color: var(--glass-border);
  background: var(--glass-fill-strong);
  box-shadow: var(--glass-shadow), var(--glass-highlight);
  -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(var(--glass-saturate));
  backdrop-filter: blur(var(--blur-strong)) saturate(var(--glass-saturate));
}

.topbar-leading {
  justify-self: start;
  min-width: 0;
  max-width: min(55vw, 320px); /* a long course name ends in "…" */
}

.topbar-trailing {
  justify-self: end;
  display: flex;
  gap: var(--space-2);
}

.topbar-title {
  overflow: hidden;
  text-align: center;
  font-family: var(--font-display);
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
  opacity: 0;
  transition: opacity var(--duration-fast);
}

.topbar.is-compact .topbar-title {
  opacity: 1;
}

/* ---------- Page header ---------- */

.page-header {
  padding: var(--space-2) 0 var(--space-2);
}

/* The big title with the page's main button on the same line */
.page-header-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3) var(--space-4);
}

.page-header-row .page-title {
  min-width: 0;
}

.page-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.page-title {
  font-family: var(--font-display);
  font-size: var(--font-size-hero);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  overflow-wrap: anywhere;
}

.page-subtitle {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 30px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-pill);
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
  font-weight: 600;
}

.dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--course-color, var(--color-accent));
}

/* ---------- Sections ---------- */

.section {
  margin-top: var(--space-6);
}

.section-title {
  padding: 0 var(--space-1) var(--space-3);
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.section-footer {
  padding: var(--space-3) var(--space-1) 0;
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
}

/* ---------- Tiles: each list item floats on its own ---------- */

.tile-list {
  display: grid;
  gap: 10px;
}

@media (min-width: 900px) {
  .tile-list.is-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

.tile {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 68px;
  padding: 14px var(--space-4);
  overflow: hidden;
  border-radius: var(--radius-l);
  color: inherit;
  font: inherit;
  text-align: left;
  text-decoration: none;
  transition: transform var(--duration-page) var(--ease-spring), box-shadow var(--duration-fast), background-color var(--duration-fast);
}

/* A soft glow in the course color in the top left corner */
.tile.has-tint::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 160% at 0% 0%, color-mix(in srgb, var(--course-color) 20%, transparent), transparent 55%);
  pointer-events: none;
}

.tile > * {
  position: relative;
}

a.tile,
button.tile {
  cursor: pointer;
}

a.tile:active,
button.tile:active {
  transform: scale(0.98);
}

@media (hover: hover) {
  a.tile:hover,
  button.tile:hover {
    background: var(--glass-fill-hover);
    box-shadow: var(--glass-shadow-raised), var(--glass-highlight);
    transform: translateY(-2px);
  }

  a.tile:hover /* On phones, a stacked tile puts its buttons on their own line */
@media (max-width: 599px) {
  .tile.is-stacked {
    flex-wrap: wrap;
  }

  .tile.is-stacked .tile-text {
    flex-basis: calc(100% - 60px);
  }

  .tile.is-stacked .tile-trailing {
    flex-basis: 100%;
    justify-content: flex-end;
  }
}

.tile-chevron {
    color: var(--color-accent);
    transform: translateX(2px);
  }
}

.tile.is-dimmed > * {
  opacity: 0.7;
}

.tile-text {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.tile-title {
  overflow: hidden;
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tile-title.is-multiline {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  white-space: normal;
}

.tile-subtitle {
  overflow: hidden;
  color: var(--color-text-secondary);
  font-size: var(--font-size-subhead);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tile-trailing {
  display: flex;
  flex: none;
  align-items: center;
  gap: var(--space-2);
}

/* On phones, a stacked tile puts its buttons on their own line */
@media (max-width: 599px) {
  .tile.is-stacked {
    flex-wrap: wrap;
  }

  .tile.is-stacked .tile-text {
    flex-basis: calc(100% - 60px);
  }

  .tile.is-stacked .tile-trailing {
    flex-basis: 100%;
    justify-content: flex-end;
  }
}

.tile-chevron {
  width: 20px;
  height: 20px;
  color: var(--color-text-tertiary);
  transition: transform var(--duration-fast), color var(--duration-fast);
}

/* The dashed "add" tile at the end of a list */
.tile.is-add {
  justify-content: center;
  min-height: 58px;
  border: 1.5px dashed var(--color-add-border);
  background: var(--color-add-fill);
  box-shadow: none;
  color: var(--color-accent);
  font-weight: 600;
}

.tile.is-add svg {
  width: 20px;
  height: 20px;
}

/* ---------- Badges and counters ---------- */

.badge {
  --course-color: var(--color-accent);
  display: grid;
  flex: none;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: var(--radius-m);
  background: linear-gradient(135deg, color-mix(in srgb, var(--course-color) 65%, white), var(--course-color));
  box-shadow: 0 6px 14px color-mix(in srgb, var(--course-color) 35%, transparent);
  color: var(--color-on-badge);
  font-family: var(--font-display);
  font-size: var(--font-size-title);
  font-weight: 800;
}

.badge svg {
  width: 22px;
  height: 22px;
}

.badge.is-small {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-s);
  font-size: var(--font-size-subhead);
}

.badge.is-small svg {
  width: 19px;
  height: 19px;
}

.badge.is-soft {
  background: color-mix(in srgb, var(--course-color) 16%, transparent);
  box-shadow: none;
  color: var(--course-color);
}

.count {
  display: inline-grid;
  place-items: center;
  min-width: 30px;
  height: 26px;
  padding: 0 10px;
  border-radius: var(--radius-pill);
  background: var(--color-row-hover);
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
  font-weight: 700;
}

/* ---------- Panels: rows grouped in one glass card (settings) ---------- */

.panel {
  overflow: hidden;
  border-radius: var(--radius-l);
}

.panel-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  min-height: 60px;
  padding: var(--space-3) var(--space-4);
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  text-align: left;
  text-decoration: none;
}

.panel-row + .panel-row {
  border-top: 1px solid var(--color-divider);
}

a.panel-row,
button.panel-row {
  cursor: pointer;
  transition: background-color var(--duration-fast);
}

a.panel-row:active,
button.panel-row:active {
  background: var(--color-row-pressed);
}

@media (hover: hover) {
  a.panel-row:hover,
  button.panel-row:hover {
    background: var(--color-row-hover);
  }
}

.panel-row-title {
  flex: 1;
  min-width: 0;
  font-weight: 500;
}

.panel-row-detail {
  color: var(--color-text-secondary);
}

/* ---------- Buttons ---------- */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: var(--tap);
  max-width: 100%;
  padding: 0 var(--space-5);
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  color: var(--color-text);
  font-size: var(--font-size-subhead);
  font-weight: 650;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-spring), box-shadow var(--duration-fast), filter var(--duration-fast),
    background-color var(--duration-fast);
}

.button span {
  overflow: hidden;
  text-overflow: ellipsis;
}

.button svg {
  flex: none;
  width: 18px;
  height: 18px;
}

.button.is-primary {
  background: var(--gradient-accent);
  box-shadow: var(--shadow-accent);
  color: var(--color-on-accent);
}

.button.is-danger {
  color: var(--color-danger);
}

.button.is-small {
  min-height: 38px;
  padding: 0 var(--space-4);
}

.button.is-icon-start {
  padding-left: var(--space-3);
}

.button:active:not(:disabled) {
  transform: scale(0.96);
}

.button:disabled {
  box-shadow: none;
  cursor: default;
  opacity: 0.45;
}

.icon-button {
  display: grid;
  flex: none;
  place-items: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 50%;
  color: var(--color-text);
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-spring), background-color var(--duration-fast);
}

.icon-button.is-danger {
  color: var(--color-danger);
}

.icon-button svg {
  width: 19px;
  height: 19px;
}

.icon-button:active {
  transform: scale(0.92);
}

@media (hover: hover) {
  .button.is-primary:not(:disabled):hover {
    filter: brightness(1.06);
    transform: translateY(-1px);
  }

  .button.is-glass:not(:disabled):hover,
  .button.is-danger:not(:disabled):hover,
  .icon-button:hover {
    background: var(--glass-fill-hover);
  }
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- Empty state ---------- */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-5);
  padding: var(--space-7) var(--space-5);
  border-radius: var(--radius-xl);
  color: var(--color-text-secondary);
  text-align: center;
}

.empty-state-icon {
  display: grid;
  place-items: center;
  width: 68px;
  height: 68px;
  margin-bottom: var(--space-2);
  border-radius: 50%;
  background: var(--color-accent-soft);
  color: var(--color-accent);
}

.empty-state-icon svg {
  width: 32px;
  height: 32px;
}

.empty-state-title {
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: var(--font-size-title);
  font-weight: 800;
}

.empty-state-text {
  max-width: 34ch;
  font-size: var(--font-size-subhead);
}

.empty-state .button {
  margin-top: var(--space-4);
}

/* ---------- Form fields ---------- */

.field {
  display: grid;
  gap: var(--space-2);
  margin-top: var(--space-5);
}

.field-label {
  padding: 0 var(--space-1);
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.input {
  width: 100%;
  min-height: 52px;
  padding: 0 var(--space-4);
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius-m);
  outline: none;
  background: var(--color-input);
  /* 16px or more stops iPhone Safari from zooming in */
  font-size: max(16px, var(--font-size-body));
  transition: border-color var(--duration-fast), box-shadow var(--duration-fast), background-color var(--duration-fast);
}

.input::placeholder {
  color: var(--color-text-tertiary);
}

.input:focus {
  border-color: var(--color-accent);
  background: var(--color-input-focus);
  box-shadow: var(--focus-ring);
}

.form-error {
  margin-top: var(--space-4);
  color: var(--color-danger);
  font-size: var(--font-size-subhead);
}

.swatches {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.swatch {
  position: relative;
  display: grid;
  place-items: center;
  width: var(--tap);
  height: var(--tap);
  cursor: pointer;
}

.swatch input {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.swatch span {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, color-mix(in srgb, var(--course-color) 60%, white), var(--course-color));
  transition: transform var(--duration-fast) var(--ease-spring), box-shadow var(--duration-fast);
}

.swatch input:checked + span {
  transform: scale(0.82);
  box-shadow: 0 0 0 3px var(--color-input-focus), 0 0 0 6px var(--course-color);
}

.swatch input:focus-visible + span {
  outline: 2px solid var(--color-accent);
  outline-offset: 8px;
}

/* ---------- Sheets ---------- */

.sheet-backdrop {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: var(--color-backdrop);
  opacity: 0;
  transition: opacity var(--duration-sheet) var(--ease-spring);
}

.sheet-layer.is-open .sheet-backdrop {
  opacity: 1;
}

/* Phone: a sheet that slides up and fills the screen below the status bar */
.sheet {
  position: fixed;
  z-index: 101;
  top: calc(env(safe-area-inset-top) + var(--space-3));
  right: 0;
  bottom: 0;
  left: 0;
  display: flex;
  flex-direction: column;
  margin: 0;
  border: 1px solid var(--glass-border);
  border-bottom: 0;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  background: var(--glass-fill-strong);
  box-shadow: var(--glass-shadow-raised), var(--glass-highlight);
  -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(var(--glass-saturate));
  backdrop-filter: blur(var(--blur-strong)) saturate(var(--glass-saturate));
  transform: translateY(100%);
  transition: transform var(--duration-sheet) var(--ease-spring);
}

.sheet-layer.is-open .sheet {
  transform: none;
}

.sheet-header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-4) var(--space-2);
}

.sheet-header > :first-child {
  justify-self: start;
}

.sheet-header > :last-child {
  justify-self: end;
}

.sheet-title {
  font-family: var(--font-display);
  font-size: var(--font-size-body);
  font-weight: 800;
}

.sheet-body {
  flex: 1;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 0 var(--gutter) calc(env(safe-area-inset-bottom) + var(--space-6));
}

/* Wide screens: a centered dialog that scales in */
@media (min-width: 900px) {
  .sheet {
    top: 50%;
    right: auto;
    bottom: auto;
    left: 50%;
    width: min(var(--sheet-width), calc(100vw - 2 * var(--space-5)));
    max-height: min(720px, 85vh);
    border-bottom: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    opacity: 0;
    transform: translate(-50%, -46%) scale(0.96);
    transition: transform var(--duration-sheet) var(--ease-spring), opacity var(--duration-fast);
  }

  .sheet-layer.is-open .sheet {
    opacity: 1;
    transform: translate(-50%, -50%);
  }
}

/* ---------- Action sheet (choices and confirmations) ---------- */

.action-sheet {
  position: fixed;
  z-index: 101;
  right: calc(var(--space-3) + env(safe-area-inset-right));
  bottom: max(var(--space-3), env(safe-area-inset-bottom));
  left: calc(var(--space-3) + env(safe-area-inset-left));
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transform: translateY(calc(100% + var(--space-6)));
  transition: transform var(--duration-sheet) var(--ease-spring);
}

.sheet-layer.is-open .action-sheet {
  transform: none;
}

.action-sheet-group {
  overflow: hidden;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-l);
  background: var(--glass-fill-strong);
  box-shadow: var(--glass-shadow-raised), var(--glass-highlight);
  -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(var(--glass-saturate));
  backdrop-filter: blur(var(--blur-strong)) saturate(var(--glass-saturate));
}

.action-sheet-header {
  padding: var(--space-4) var(--space-5);
  color: var(--color-text-secondary);
  font-size: var(--font-size-subhead);
  text-align: center;
}

.action-sheet-title {
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 800;
}

.action-sheet-button {
  display: block;
  width: 100%;
  min-height: 56px;
  padding: 0 var(--space-4);
  border: 0;
  border-top: 1px solid var(--color-divider);
  background: none;
  color: var(--color-accent);
  font-size: var(--font-size-body);
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--duration-fast);
}

.action-sheet-group > .action-sheet-button:first-child {
  border-top: 0;
}

.action-sheet-button:active {
  background: var(--color-row-pressed);
}

.action-sheet-button.is-destructive {
  color: var(--color-danger);
}

.action-sheet-button.is-cancel {
  color: var(--color-text);
}

@media (hover: hover) {
  .action-sheet-button:hover {
    background: var(--color-row-hover);
  }
}

/* Wide screens: a centered dialog instead of a bottom sheet */
@media (min-width: 900px) {
  .action-sheet {
    top: 50%;
    right: auto;
    bottom: auto;
    left: 50%;
    width: 360px;
    opacity: 0;
    transform: translate(-50%, -46%) scale(0.96);
    transition: transform var(--duration-sheet) var(--ease-spring), opacity var(--duration-fast);
  }

  .sheet-layer.is-open .action-sheet {
    opacity: 1;
    transform: translate(-50%, -50%);
  }
}

/* ---------- Large sheet (card editor, sketch) ---------- */

@media (min-width: 900px) {
  .sheet.is-large {
    width: min(1100px, calc(100vw - 2 * var(--space-6)));
    height: min(900px, 92vh);
    max-height: none;
  }
}

/* ---------- Card text written in Markdown ---------- */

.markdown {
  line-height: 1.5;
  overflow-wrap: anywhere;
}

.markdown > * + * {
  margin-top: 0.6em;
}

.markdown h1,
.markdown h2,
.markdown h3,
.markdown h4,
.markdown h5,
.markdown h6,
.markdown ul,
.markdown ol,
.markdown pre,
.markdown blockquote,
.markdown table {
  margin-bottom: 0;
}

.markdown h1,
.markdown h2,
.markdown h3,
.markdown h4,
.markdown h5,
.markdown h6 {
  margin-top: 0.8em;
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.25;
}

.markdown > :first-child {
  margin-top: 0;
}

.markdown h1 {
  font-size: 1.5em;
}

.markdown h2 {
  font-size: 1.3em;
}

.markdown h3 {
  font-size: 1.15em;
}

.markdown h4,
.markdown h5,
.markdown h6 {
  font-size: 1em;
}

.markdown ul,
.markdown ol {
  padding-left: 1.4em;
}

.markdown li + li {
  margin-top: 0.2em;
}

.markdown li > p,
.markdown li > ul,
.markdown li > ol {
  margin: 0;
}

.markdown blockquote {
  margin-left: 0;
  margin-right: 0;
  padding: 2px 0 2px 14px;
  border-left: 3px solid var(--color-quote);
  color: var(--color-text-secondary);
}

.markdown code {
  padding: 1px 6px;
  border-radius: 6px;
  background: var(--color-code);
  font-family: var(--font-mono);
  font-size: 0.88em;
}

.markdown pre {
  overflow-x: auto;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-s);
  background: var(--color-code);
}

.markdown pre code {
  padding: 0;
  background: none;
}

.markdown hr {
  border: 0;
  border-top: 1px solid var(--color-table-border);
}

.markdown table {
  display: block;
  overflow-x: auto;
  border-collapse: collapse;
  font-size: 0.95em;
}

.markdown th,
.markdown td {
  padding: 6px 10px;
  border: 1px solid var(--color-table-border);
  text-align: left;
}

.markdown th {
  background: var(--color-code);
}

.markdown .align-center {
  text-align: center;
}

.markdown .align-right {
  text-align: right;
}

/* ---------- Card editor ---------- */

.editor-banner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-3);
  margin-top: var(--space-4);
  padding: var(--space-2) var(--space-2) var(--space-2) var(--space-4);
  border-radius: var(--radius-m);
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-size: var(--font-size-subhead);
  font-weight: 600;
}

.editor-side {
  margin-top: var(--space-5);
}

.editor-side-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.editor-side-tools {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.editor-side-body {
  display: grid;
  gap: var(--space-3);
}

@media (min-width: 900px) {
  .sheet.is-large .editor-side-body {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
}

.textarea {
  display: block;
  min-height: 120px;
  padding: var(--space-3) var(--space-4);
  line-height: 1.45;
  resize: vertical;
}

.preview {
  min-height: 120px;
  padding: var(--space-3) var(--space-4);
  border: 1px dashed var(--color-input-border);
  border-radius: var(--radius-m);
  background: var(--color-preview);
}

.preview.is-empty::before {
  content: attr(data-placeholder);
  color: var(--color-text-tertiary);
}

.preview-pictures {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: var(--space-2);
}

.preview-pictures:not(:empty) {
  margin-top: var(--space-3);
}

.picture {
  display: block;
  width: 100%;
  border-radius: var(--radius-s);
  background: var(--color-canvas);
}

.thumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.thumbs:not(:empty) {
  margin-top: var(--space-1);
}

.thumb {
  position: relative;
  width: 88px;
  height: 88px;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-s);
  background: var(--color-canvas);
  box-shadow: var(--glass-shadow);
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-spring);
}

.thumb:active {
  transform: scale(0.95);
}

.thumb img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.thumb-tag {
  position: absolute;
  left: 4px;
  bottom: 4px;
  padding: 1px 6px;
  border-radius: var(--radius-pill);
  background: var(--glass-fill-strong);
  color: var(--color-text-secondary);
  font-size: 11px;
  font-weight: 700;
}

.markdown-hint {
  margin-top: var(--space-2);
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
}

.markdown-hint code {
  font-family: var(--font-mono);
}

.editor-footer {
  margin-top: var(--space-6);
}

/* ---------- Select (chapter picker) ---------- */

.select-wrap {
  position: relative;
}

.select-wrap select {
  -webkit-appearance: none;
  appearance: none;
  padding-right: 48px;
  cursor: pointer;
}

.select-wrap svg {
  position: absolute;
  top: 50%;
  right: var(--space-4);
  width: 18px;
  height: 18px;
  color: var(--color-text-secondary);
  pointer-events: none;
  transform: translateY(-50%) rotate(90deg);
}

/* ---------- Flags ---------- */

.flag-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.flag-option {
  --flag-color: var(--color-text-tertiary);
  position: relative;
  cursor: pointer;
}

.flag-option input {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.flag-option span {
  display: grid;
  place-items: center;
  width: var(--tap);
  height: var(--tap);
  border: 1px solid var(--color-input-border);
  border-radius: 50%;
  background: var(--color-input);
  color: var(--flag-color);
  transition: transform var(--duration-fast) var(--ease-spring), box-shadow var(--duration-fast);
}

.flag-option svg {
  width: 20px;
  height: 20px;
}

.flag-option input:checked + span {
  border-color: var(--flag-color);
  background: color-mix(in srgb, var(--flag-color) 16%, var(--color-input-focus));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--flag-color) 25%, transparent);
  transform: scale(1.06);
}

.flag-option input:focus-visible + span {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.flag-mark {
  width: 18px;
  height: 18px;
  color: var(--flag-color);
}

.tile-icon {
  width: 18px;
  height: 18px;
  color: var(--color-text-tertiary);
}

/* ---------- Sketch pad ---------- */

.sketch {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.sketch-canvas {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius-m);
  background: var(--color-canvas);
  box-shadow: var(--glass-shadow);
  cursor: crosshair;
  touch-action: none;
}

@media (min-width: 900px) {
  /* Keep the whole canvas visible inside the dialog */
  .sheet.is-large .sketch-canvas {
    width: auto;
    max-width: 100%;
    max-height: calc(min(900px, 92vh) - 210px);
    margin: 0 auto;
  }
}

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

.sketch-tools .swatches {
  margin-right: var(--space-2);
}

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

/* ---------- Panel rows with a second line ---------- */

.panel-row-title:has(.panel-row-subtitle) {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.panel-row-subtitle {
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
  font-weight: 400;
}

/* ---------- Algorithm editor ---------- */

.waits {
  display: grid;
  gap: var(--space-2);
}

.wait-row {
  display: grid;
  grid-template-columns: 72px 96px auto 1fr var(--tap);
  align-items: center;
  gap: var(--space-2);
}

.wait-level {
  color: var(--color-text-secondary);
  font-size: var(--font-size-subhead);
  font-weight: 600;
}

.wait-row .input {
  min-height: var(--tap);
  padding: 0 var(--space-3);
  text-align: right;
}

.wait-row .input:invalid {
  border-color: var(--color-danger);
}

.wait-unit {
  color: var(--color-text-secondary);
  font-size: var(--font-size-subhead);
}

.wait-total {
  justify-self: end;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-size: var(--font-size-small);
  font-weight: 700;
  white-space: nowrap;
}

.wait-row .icon-button {
  justify-self: end;
}

.waits-add {
  justify-self: start;
  margin-top: var(--space-1);
}

.preview-note {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-m);
  background: var(--color-accent-soft);
  font-size: var(--font-size-subhead);
}

.preview-note + .preview-note {
  margin-top: var(--space-2);
  background: var(--color-preview);
  color: var(--color-text-secondary);
}

/* Two or more choices that look like one pill with a sliding highlight */
.segmented {
  display: flex;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius-pill);
  background: var(--color-input);
}

.segmented label {
  position: relative;
  flex: 1;
  cursor: pointer;
}

.segmented input {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.segmented span {
  display: grid;
  place-items: center;
  min-height: 40px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-pill);
  color: var(--color-text-secondary);
  font-size: var(--font-size-subhead);
  font-weight: 600;
  text-align: center;
  transition: background-color var(--duration-fast), color var(--duration-fast), box-shadow var(--duration-fast);
}

.segmented input:checked + span {
  background: var(--gradient-accent);
  box-shadow: var(--shadow-accent);
  color: var(--color-on-accent);
}

.segmented input:focus-visible + span {
  box-shadow: var(--focus-ring);
}

.field-note {
  padding: 0 var(--space-1);
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
}

/* ---------- On/off switch ---------- */

.toggle-row {
  cursor: default;
}

.toggle-row label {
  cursor: pointer;
}

.switch {
  position: relative;
  flex: none;
  width: 52px;
  height: 32px;
}

.switch-input {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.switch-track {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-pill);
  background: var(--color-switch-off);
  transition: background-color var(--duration-fast);
}

.switch-track::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--color-knob);
  box-shadow: var(--shadow-knob);
  transition: transform var(--duration-page) var(--ease-spring);
}

.switch-input:checked + .switch-track {
  background: var(--gradient-accent);
}

.switch-input:checked + .switch-track::after {
  transform: translateX(20px);
}

.switch-input:focus-visible + .switch-track {
  box-shadow: var(--focus-ring);
}

.input.is-compact {
  flex: none;
  width: 76px;
  min-height: 40px;
  padding: 0 var(--space-3);
  text-align: right;
}

.input.is-compact:disabled {
  opacity: 0.45;
}

.input[aria-invalid] {
  border-color: var(--color-danger);
}

/* ---------- Due pills ---------- */

.due-pill {
  flex: none;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: var(--color-row-hover);
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
  font-weight: 700;
  white-space: nowrap;
}

.due-pill.is-due {
  --course-color: var(--color-accent);
  background: color-mix(in srgb, var(--course-color) 16%, transparent);
  color: var(--course-color);
}

/* ---------- Today ---------- */

.today-hero {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-5);
  padding: var(--space-5);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  background: var(--glass-fill);
  box-shadow: var(--glass-shadow), var(--glass-highlight);
  -webkit-backdrop-filter: blur(var(--blur-glass)) saturate(var(--glass-saturate));
  backdrop-filter: blur(var(--blur-glass)) saturate(var(--glass-saturate));
}

.today-number {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-family: var(--font-display);
  font-size: 56px;
  font-weight: 800;
  line-height: 1;
}

.today-label {
  font-family: var(--font-display);
  font-size: var(--font-size-title);
  font-weight: 800;
}

.today-sub {
  color: var(--color-text-secondary);
  font-size: var(--font-size-subhead);
}

/* ---------- Quiz ---------- */

/* Full-screen pages hide the tab bar and the sidebar */
body.is-full-screen .app-nav {
  display: none;
}

body.is-full-screen .main {
  margin-left: 0;
  padding-bottom: 0;
}

.quiz {
  --course-color: var(--color-accent);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  width: 100%;
  max-width: var(--quiz-width);
  min-height: 100dvh;
  margin: 0 auto;
  padding: calc(env(safe-area-inset-top) + var(--space-3)) calc(var(--gutter) + env(safe-area-inset-right)) 0
    calc(var(--gutter) + env(safe-area-inset-left));
}

.quiz-header {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-3);
}

.quiz-title {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-width: 0;
  font-family: var(--font-display);
  font-weight: 800;
}

.quiz-title span:last-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.quiz-header-end {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.quiz-counter {
  color: var(--color-text-secondary);
  font-size: var(--font-size-subhead);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.quiz-progress {
  height: 6px;
  overflow: hidden;
  border-radius: var(--radius-pill);
  background: var(--glass-fill);
  box-shadow: var(--glass-highlight);
}

.quiz-progress-fill {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, color-mix(in srgb, var(--course-color) 60%, white), var(--course-color));
  transition: width var(--duration-page) var(--ease-spring);
}

.quiz-stage {
  flex: 1;
  /* Room around the card so its frame is never cut off */
  padding: calc(var(--card-frame-width) + var(--space-3)) var(--card-frame-width);
}

/* The card: two faces in the same grid cell, turned in 3D. Tap to turn it
   either way. */
.flip {
  perspective: 1600px;
  cursor: pointer;
  animation: card-in var(--duration-page) var(--ease-spring);
}

.flip-inner {
  display: grid;
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  transition: transform var(--duration-flip) var(--ease-spring);
}

.flip.is-flipped .flip-inner {
  transform: rotateY(180deg);
}

/* The faces are nearly opaque glass without backdrop-filter: blur inside a 3D
   turn is unreliable in Safari and Chrome, and the card still reads as glass. */
.face {
  grid-area: 1 / 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  min-height: var(--quiz-card-height);
  padding: var(--space-6);
  border: 1px solid var(--card-edge);
  border-radius: var(--radius-xl);
  background: var(--glass-fill-strong);
  /* The frame is a soft white ring outside the edge, plus a faint line inside it */
  box-shadow:
    0 0 0 var(--card-frame-width) var(--card-frame),
    var(--glass-shadow-raised),
    inset 0 0 0 1px var(--card-inner-line),
    var(--glass-highlight);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  font-size: var(--font-size-title);
}

.face.is-back {
  transform: rotateY(180deg);
}

.face-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.face-tag {
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-danger) 14%, transparent);
  color: var(--color-danger);
  letter-spacing: 0;
  text-transform: none;
}

.face-content {
  flex: 1;
}

.face-hint {
  color: var(--color-text-tertiary);
  font-size: var(--font-size-small);
  text-align: center;
}

.flip.is-leaving-right {
  animation: card-out-right 0.26s ease-in forwards;
}

.flip.is-leaving-wrong {
  animation: card-out-wrong 0.26s ease-in forwards;
}

@keyframes card-in {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.98);
  }
}

@keyframes card-out-right {
  to {
    opacity: 0;
    transform: translateX(40px) rotate(2deg);
  }
}

@keyframes card-out-wrong {
  to {
    opacity: 0;
    transform: translateX(-40px) rotate(-2deg);
  }
}

/* Controls: a fully rounded glass pill floating above the bottom edge */
.quiz-controls {
  position: sticky;
  bottom: max(var(--space-4), env(safe-area-inset-bottom));
  display: flex;
  gap: var(--space-2);
  margin-bottom: max(var(--space-4), env(safe-area-inset-bottom));
  padding: var(--space-2);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  background: var(--glass-fill);
  box-shadow: var(--glass-shadow-raised), var(--glass-highlight);
  -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(var(--glass-saturate));
  backdrop-filter: blur(var(--blur-strong)) saturate(var(--glass-saturate));
}

.quiz-controls .button {
  flex: 1;
  min-height: 56px;
  font-size: var(--font-size-body);
}

.button.is-right {
  background: var(--gradient-right);
  box-shadow: var(--shadow-right);
  color: var(--color-on-accent);
}

.button.is-wrong {
  background: var(--gradient-wrong);
  box-shadow: var(--shadow-wrong);
  color: var(--color-on-accent);
}

@media (hover: hover) {
  .button.is-right:hover,
  .button.is-wrong:hover {
    filter: brightness(1.06);
    transform: translateY(-1px);
  }
}

/* Summary at the end */
.quiz-summary {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-6) var(--space-5);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  background: var(--glass-fill);
  box-shadow: var(--glass-shadow), var(--glass-highlight);
  -webkit-backdrop-filter: blur(var(--blur-glass)) saturate(var(--glass-saturate));
  backdrop-filter: blur(var(--blur-glass)) saturate(var(--glass-saturate));
  color: var(--color-text-secondary);
  text-align: center;
  animation: card-in var(--duration-page) var(--ease-spring);
}

.quiz-summary-icon {
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  margin-bottom: var(--space-2);
  border-radius: 50%;
  background: var(--gradient-right);
  box-shadow: var(--shadow-right);
  color: var(--color-on-accent);
}

.quiz-summary-icon svg {
  width: 32px;
  height: 32px;
  stroke-width: 2.6;
}

.quiz-summary .page-title {
  color: var(--color-text);
}

.quiz-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  width: 100%;
  margin-top: var(--space-4);
}

.quiz-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: var(--space-4);
  border-radius: var(--radius-l);
  background: var(--color-preview);
}

.quiz-stat strong {
  font-family: var(--font-display);
  font-size: 36px;
  line-height: 1.1;
}

.quiz-stat.is-right strong {
  color: var(--flag-green);
}

.quiz-stat.is-wrong strong {
  color: var(--color-danger);
}

.quiz-stat span {
  font-size: var(--font-size-small);
  font-weight: 600;
}

.quiz .empty-state {
  margin-top: 20vh;
}

/* ---------- Section header with a button (for example "Select") ---------- */

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-3);
  padding-bottom: var(--space-3);
}

.section-header .section-title {
  padding-bottom: var(--space-2);
}

/* ---------- Search ---------- */

.search-box {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.search-field {
  position: relative;
  display: block;
}

.search-field > svg {
  position: absolute;
  z-index: 1; /* above the field's glass, which paints as its own layer */
  top: 50%;
  left: var(--space-4);
  width: 20px;
  height: 20px;
  color: var(--color-text-secondary);
  pointer-events: none;
  transform: translateY(-50%);
}

.search-input {
  padding-left: 46px;
  border-color: var(--glass-border);
  border-radius: var(--radius-pill);
  background: var(--glass-fill-strong);
  box-shadow: var(--glass-shadow), var(--glass-highlight);
  -webkit-appearance: none;
  appearance: none;
  -webkit-backdrop-filter: blur(var(--blur-glass)) saturate(var(--glass-saturate));
  backdrop-filter: blur(var(--blur-glass)) saturate(var(--glass-saturate));
}

.search-filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* A filter: a glass pill with a native picker inside */
.filter-select {
  position: relative;
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  background: var(--glass-fill);
  box-shadow: var(--glass-shadow), var(--glass-highlight);
  -webkit-backdrop-filter: blur(var(--blur-glass)) saturate(var(--glass-saturate));
  backdrop-filter: blur(var(--blur-glass)) saturate(var(--glass-saturate));
  transition: background-color var(--duration-fast), border-color var(--duration-fast);
}

.filter-select-input {
  max-width: 220px;
  min-height: var(--tap);
  padding: 0 38px 0 var(--space-4);
  border: 0;
  border-radius: var(--radius-pill);
  outline: none;
  background: transparent;
  color: var(--color-text-secondary);
  /* 16px or more stops iPhone Safari from zooming in */
  font-size: max(16px, var(--font-size-subhead));
  font-weight: 600;
  text-overflow: ellipsis;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

.filter-select-input:focus-visible {
  box-shadow: var(--focus-ring);
}

.filter-select > svg {
  position: absolute;
  right: var(--space-3);
  width: 16px;
  height: 16px;
  color: var(--color-text-secondary);
  pointer-events: none;
  transform: rotate(90deg);
}

.filter-select.is-active {
  border-color: var(--color-add-border);
  background: var(--color-accent-soft);
}

.filter-select.is-active .filter-select-input,
.filter-select.is-active > svg {
  color: var(--color-accent);
}

.search-results {
  min-height: 1px;
}

/* A tile with a round menu button on top of its right end */
.tile-with-menu {
  position: relative;
}

.tile-with-menu > .tile {
  width: 100%;
  padding-right: 64px;
}

.tile-with-menu > .icon-button {
  position: absolute;
  top: 50%;
  right: var(--space-3);
  margin-top: -20px;
}

/* ---------- Selecting several tiles ---------- */

.select-mark {
  display: none;
  flex: none;
  place-items: center;
  width: 26px;
  height: 26px;
  border: 2px solid var(--color-text-tertiary);
  border-radius: 50%;
  color: transparent;
  transition: background-color var(--duration-fast), border-color var(--duration-fast), transform var(--duration-fast) var(--ease-spring);
}

.select-mark svg {
  width: 15px;
  height: 15px;
  stroke-width: 2.6;
}

.tile.is-selectable .select-mark {
  display: grid;
}

/* On phones the check takes the place of the badge, to keep room for the text */
@media (max-width: 599px) {
  .tile.is-selectable .badge {
    display: none;
  }
}

.tile.is-selected {
  border-color: var(--color-add-border);
  background: var(--glass-fill-strong);
}

.tile.is-selected .select-mark {
  border-color: transparent;
  background: var(--gradient-accent);
  box-shadow: var(--shadow-accent);
  color: var(--color-on-accent);
  transform: scale(1.06);
}

/* The bar with the commands floats above the tab bar (phones) or the bottom edge */
.select-bar {
  position: sticky;
  z-index: 10;
  bottom: calc(var(--tabbar-height) + max(var(--tabbar-gap), env(safe-area-inset-bottom)) + var(--space-2));
  display: grid;
  gap: var(--space-2);
  margin-top: var(--space-5);
  padding: var(--space-2);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  background: var(--glass-fill-strong);
  box-shadow: var(--glass-shadow-raised), var(--glass-highlight);
  -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(var(--glass-saturate));
  backdrop-filter: blur(var(--blur-strong)) saturate(var(--glass-saturate));
  animation: select-bar-in var(--duration-page) var(--ease-spring);
}

@media (min-width: 900px) {
  .select-bar {
    bottom: var(--space-4);
  }
}

@keyframes select-bar-in {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
}

.select-bar-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.select-bar-count {
  flex: 1;
  padding-left: var(--space-2);
  font-weight: 700;
}

.select-bar-end {
  display: flex;
  gap: var(--space-2);
}

.select-bar-row.is-commands .button {
  flex: 1;
  min-height: var(--tap);
}