/* ==========================================================================
   Unified Speaking Practice Controller — CSS
   Namespace: spc-*
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens
   -------------------------------------------------------------------------- */
:root {
  --spc-z-sticky: 500;
  --spc-z-backdrop: 8000;
  --spc-z-sheet: 8010;
  --spc-radius: 10px;
  --spc-gap: 8px;
  --spc-control-h: 44px;
  --spc-transition: 200ms ease;
  --spc-bg: #fff;
  --spc-color-primary: #2563eb;
  --spc-color-surface: #f5f5f7;
  --spc-color-surface-hover: #ededf0;
  --spc-color-border: rgba(0, 0, 0, 0.08);
}

/* --------------------------------------------------------------------------
   2. Controller Container
   -------------------------------------------------------------------------- */
.spc-controller {
  position: sticky;
  top: 0;
  z-index: var(--spc-z-sticky);
  background: var(--spc-bg, #fff);
  border-bottom: 1px solid var(--spc-color-border);
  padding: 12px 0;
  display: flex;
  flex-direction: column;
  gap: var(--spc-gap);
}

/* --------------------------------------------------------------------------
   3. Rows
   -------------------------------------------------------------------------- */
.spc-row {
  display: flex;
  align-items: center;
  gap: var(--spc-gap);
  flex-wrap: wrap;
}

/* Primary row: picker fills space, toggle sits on the right */
.spc-row--primary {
  flex-wrap: nowrap;
}

/* Actions row: media left, attempt right */
.spc-row--actions {
  justify-content: space-between;
}

/* Advanced row: visibility controlled via data attribute (see §8) */
.spc-row--advanced {
  /* No additional layout overrides — inherits .spc-row */
}

/* --------------------------------------------------------------------------
   4. Picker Navigation
   -------------------------------------------------------------------------- */
.spc-picker-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  max-width: 580px;
  min-width: 0;
}

.spc-picker-prev,
.spc-picker-next {
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--spc-color-border, rgba(0, 0, 0, 0.12));
  background: var(--spc-bg, #ffffff);
  border-radius: 50%;
  cursor: pointer;
  color: var(--text-muted, #5f6368);
  font-size: 16px;
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  transition: all var(--spc-transition);
}

.spc-picker-prev:hover:not(:disabled),
.spc-picker-next:hover:not(:disabled) {
  background: var(--spc-color-primary, #1a73e8);
  border-color: var(--spc-color-primary, #1a73e8);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(26, 115, 232, 0.28);
  transform: scale(1.06);
}

.spc-picker-prev:active:not(:disabled),
.spc-picker-next:active:not(:disabled) {
  transform: scale(0.95);
}

.spc-picker-prev:disabled,
.spc-picker-next:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  background: #f1f3f4;
  border-color: rgba(0, 0, 0, 0.06);
  box-shadow: none;
  color: #9aa0a6;
}

/* Pill — the tappable label between arrows */
.spc-picker-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
  height: var(--spc-control-h);
  padding: 0 14px;
  border: none;
  border-radius: 22px;
  background: var(--spc-color-surface);
  font-size: 14px;
  line-height: 1.3;
  cursor: pointer;
  transition: background var(--spc-transition);
  color: inherit;
  text-align: left;
}

.spc-picker-pill:hover {
  background: var(--spc-color-surface-hover);
}

.spc-picker-pill-id {
  flex-shrink: 0;
  font-size: 12px;
  font-weight: 600;
  color: var(--spc-color-primary);
}

.spc-picker-pill-label {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.spc-picker-pill-arrow {
  flex-shrink: 0;
  transition: transform var(--spc-transition);
}

/* Rotate arrow when the sheet is expanded */
.spc-picker-pill[aria-expanded="true"] .spc-picker-pill-arrow {
  transform: rotate(180deg);
}

/* --------------------------------------------------------------------------
   5. View Toggle (Segmented Control)
   -------------------------------------------------------------------------- */
.spc-view-toggle {
  display: inline-flex;
  align-items: center;
  border-radius: 8px;
  background: var(--spc-color-surface);
  padding: 3px;
  gap: 2px;
  flex-shrink: 0;
}

.spc-view-toggle-btn {
  height: 36px;
  padding: 0 14px;
  border: none;
  border-radius: 6px;
  background: transparent;
  font-size: 13px;
  font-weight: 400;
  color: inherit;
  cursor: pointer;
  transition:
    background var(--spc-transition),
    box-shadow var(--spc-transition);
  white-space: nowrap;
}

.spc-view-toggle-btn[aria-pressed="true"],
.spc-view-toggle-btn[aria-checked="true"] {
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  font-weight: 600;
}

.spc-view-toggle-btn:hover:not([aria-pressed="true"]):not([aria-checked="true"]) {
  background: rgba(0, 0, 0, 0.04);
}

/* --------------------------------------------------------------------------
   6. Active Chip
   -------------------------------------------------------------------------- */
.spc-active-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border: none;
  border-radius: 12px;
  background: rgba(37, 99, 235, 0.08);
  color: var(--spc-color-primary);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--spc-transition);
  white-space: nowrap;
}

.spc-active-chip:hover {
  background: rgba(37, 99, 235, 0.14);
}

.spc-active-chip[data-count="0"] {
  display: none;
}

/* --------------------------------------------------------------------------
   7. Sheet (Side-panel / Bottom-sheet)
   -------------------------------------------------------------------------- */

/* Backdrop */
.spc-sheet-backdrop {
  position: fixed;
  inset: 0;
  z-index: var(--spc-z-backdrop);
  background: rgba(0, 0, 0, 0.3);
  opacity: 0;
  pointer-events: none;
  transition: opacity 300ms ease;
}

.spc-sheet-backdrop.is-active {
  opacity: 1;
  pointer-events: auto;
}

/* Sheet container */
.spc-sheet {
  position: fixed;
  z-index: var(--spc-z-sheet);
  background: #fff;
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.12);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Desktop (>640px): right-side panel */
@media (min-width: 641px) {
  .spc-sheet {
    top: 0;
    right: 0;
    bottom: 0;
    width: min(420px, 85vw);
    border-radius: var(--spc-radius) 0 0 var(--spc-radius);
    transform: translateX(100%);
    transition: transform 300ms ease;
  }

  .spc-sheet.is-active {
    transform: translateX(0);
  }
}

/* Mobile (≤640px): bottom sheet */
@media (max-width: 640px) {
  .spc-sheet {
    left: 0;
    right: 0;
    bottom: 0;
    max-height: 85vh;
    border-radius: var(--spc-radius) var(--spc-radius) 0 0;
    transform: translateY(100%);
    transition: transform 300ms ease;
  }

  .spc-sheet.is-active {
    transform: translateY(0);
  }
}

/* Sheet header */
.spc-sheet-header {
  position: sticky;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: #fff;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  z-index: 1;
}

.spc-sheet-header h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
}

/* Close button */
.spc-sheet-close {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 50%;
  background: var(--spc-color-surface);
  cursor: pointer;
  font-size: 18px;
  color: inherit;
  transition: background var(--spc-transition);
}

.spc-sheet-close:hover {
  background: var(--spc-color-surface-hover);
}

/* Search input */
.spc-sheet-search {
  display: block;
  width: 100%;
  height: 40px;
  padding: 0 12px;
  margin: 12px 0 8px;
  border: 1px solid rgba(0, 0, 0, 0.12);
  border-radius: 8px;
  font-size: 14px;
  background: #fff;
  color: inherit;
  outline: none;
  transition:
    border-color var(--spc-transition),
    box-shadow var(--spc-transition);
}

.spc-sheet-search:focus {
  border-color: var(--spc-color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

/* Sheet body (scrollable list area) */
.spc-sheet-body {
  flex: 1;
  overflow-y: auto;
  padding: 8px 16px 16px;
}

/* Sheet tab navigation */
.spc-sheet-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  padding: 0 16px;
  margin: 0 -16px 16px -16px;
}

.spc-sheet-tab {
  flex: 1;
  padding: 10px 12px;
  border: none;
  background: transparent;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--spc-color-muted, #5f6368);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
  white-space: nowrap;
  text-align: center;
}

.spc-sheet-tab:hover {
  color: var(--spc-color-primary, #1a73e8);
  background: rgba(26, 115, 232, 0.04);
}

.spc-sheet-tab[aria-selected="true"],
.spc-sheet-tab.active {
  color: var(--spc-color-primary, #1a73e8);
  border-bottom-color: var(--spc-color-primary, #1a73e8);
  font-weight: 600;
}

.spc-sheet-tab-panel {
  display: none;
}

.spc-sheet-tab-panel.active {
  display: block;
}

/* List */
.spc-sheet-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

/* List item */
.spc-sheet-item {
  display: flex;
  align-items: center;
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: background var(--spc-transition);
}

.spc-sheet-item:hover {
  background: rgba(0, 0, 0, 0.04);
}

.spc-sheet-item.is-current {
  background: rgba(37, 99, 235, 0.08);
  color: #2563eb;
  font-weight: 500;
}

.spc-sheet-item[aria-disabled="true"] {
  opacity: 0.5;
  pointer-events: none;
  cursor: default;
}

.spc-sheet-item-id {
  flex-shrink: 0;
  font-size: 12px;
  font-weight: 600;
  color: #2563eb;
  margin-right: 8px;
}

.spc-sheet-item-label {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Empty state */
.spc-sheet-empty {
  padding: 32px 16px;
  text-align: center;
  color: rgba(0, 0, 0, 0.65);
  font-size: 14px;
}

/* --------------------------------------------------------------------------
   8. Slots (Media · Attempt · Advanced)
   -------------------------------------------------------------------------- */
.spc-slot-media,
.spc-slot-attempt,
.spc-slot-advanced-action,
.spc-slot-advanced-setting {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.spc-slot-media:empty,
.spc-slot-attempt:empty,
.spc-slot-advanced-action:empty,
.spc-slot-advanced-setting:empty,
.spc-slot-media:not(:has(*)),
.spc-slot-attempt:not(:has(*)),
.spc-slot-advanced-action:not(:has(*)),
.spc-slot-advanced-setting:not(:has(*)) {
  display: none;
}

/* Collapse actions row when both child slots are empty (e.g. Read Aloud
   keeps action buttons in native HTML for natural Read→Record→Review flow) */
.spc-row--actions:not(:has(.spc-slot-media > *, .spc-slot-attempt > *)) {
  display: none;
}

/* --------------------------------------------------------------------------
   9. Visibility Rules
   -------------------------------------------------------------------------- */

/* Hide advanced row when NOT in advanced view */
.spc-controller:not([data-spc-view="advanced"]) .spc-row--advanced {
  display: none;
}

/* Hide any element marked as advanced-level when NOT in advanced view */
.spc-controller:not([data-spc-view="advanced"]) [data-spc-level="advanced"] {
  display: none;
}

/* Also hide advanced in-place controls at the panel level.
   applyView() sets data-spc-view on the panel element for this rule. */
[data-spc-view]:not([data-spc-view="advanced"]) [data-spc-level="advanced"] {
  display: none;
}

/* Dedicated Read Aloud history action is only visible while its controller
   owns the host; the expanded history content remains mode-owned below it. */
#mode-read-aloud:not([data-spc-view]) #ra-history-action-host {
  display: none;
}

.ra-history-action-host {
  display: contents;
}

.ra-history-content-host {
  width: 100%;
  margin-top: 12px;
}

/* Hide toggle when controller declares no toggle needed */
.spc-controller[data-spc-no-toggle] .spc-view-toggle {
  display: none;
}

/* --------------------------------------------------------------------------
   10. Responsive — Tablet / Small screens
   -------------------------------------------------------------------------- */
@media (max-width: 640px) {
  .spc-row--primary {
    flex-wrap: wrap;
  }

  .spc-row--primary .spc-picker-nav {
    width: 100%;
    flex: unset;
  }

  .spc-row--primary .spc-view-toggle {
    margin-left: auto;
  }
}

/* Extra-small screens */
@media (max-width: 390px) {
  .spc-picker-pill {
    font-size: 13px;
    padding: 0 10px;
    min-height: 44px;
  }

  .spc-picker-prev,
  .spc-picker-next {
    width: 44px;
    height: 44px;
    font-size: 16px;
  }

  .spc-view-toggle-btn {
    min-height: 44px;
    padding: 0 10px;
    font-size: 12px;
  }

  .spc-sheet-header {
    padding: 12px 14px;
  }

  .spc-sheet-body {
    padding: 6px 14px 14px;
  }

  .spc-sheet-item {
    padding: 8px 10px;
  }
}

/* --------------------------------------------------------------------------
   11. Accessibility
   -------------------------------------------------------------------------- */

/* Focus-visible ring on all interactive elements */
.spc-picker-prev:focus-visible,
.spc-picker-next:focus-visible,
.spc-picker-pill:focus-visible,
.spc-view-toggle-btn:focus-visible,
.spc-active-chip:focus-visible,
.spc-sheet-close:focus-visible,
.spc-sheet-search:focus-visible,
.spc-sheet-item:focus-visible {
  outline: 2px solid var(--spc-color-primary);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .spc-controller,
  .spc-controller *,
  .spc-sheet,
  .spc-sheet-backdrop,
  .spc-picker-pill-arrow {
    transition-duration: 0ms !important;
    animation: none !important;
  }
}

/* Screen-reader only utility */
.spc-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;
}

/* --------------------------------------------------------------------------
   12. Settings Side Panel Styles (Adaptive Difficulty & Target Settings)
   -------------------------------------------------------------------------- */
.spc-mode-settings-sheet .spc-sheet-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.spc-settings-section {
  background: var(--bg-card, #ffffff);
  border: 1px solid var(--border-color, #e2e8f0);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 12px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.spc-settings-section-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-heading, #1e293b);
  margin: 0 0 12px 0;
  display: flex;
  align-items: center;
  gap: 8px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.spc-settings-section .adaptive-toggle-container {
  display: flex !important;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 8px;
}

.spc-settings-section .question-total,
.spc-settings-section .question-count-info {
  display: block !important;
  font-size: 0.85rem;
  color: var(--text-muted, #64748b);
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--border-color, #e2e8f0);
}

.spc-settings-section .question-filters-row {
  display: flex !important;
  flex-direction: column;
  gap: 10px;
  margin-top: 8px;
}

.spc-settings-section .status-filter-dropdown,
.spc-settings-section .length-filter-dropdown,
.spc-settings-section .difficulty-filter-dropdown {
  display: block !important;
  width: 100%;
}

.spc-settings-section .status-filter-btn,
.spc-settings-section .length-filter-btn,
.spc-settings-section .difficulty-filter-btn {
  width: 100%;
  justify-content: space-between;
}

/* Hide any element marked as advanced-level when NOT in advanced view */
.spc-controller:not([data-spc-view="advanced"]) [data-spc-level="advanced"] {
  display: none;
}

/* Also hide advanced in-place controls at the panel level.
   applyView() sets data-spc-view on the panel element for this rule. */
[data-spc-view]:not([data-spc-view="advanced"]) [data-spc-level="advanced"] {
  display: none;
}

/* Dedicated Read Aloud history action is only visible while its controller
   owns the host; the expanded history content remains mode-owned below it. */
#mode-read-aloud:not([data-spc-view]) #ra-history-action-host {
  display: none;
}

.ra-history-action-host {
  display: contents;
}

.ra-history-content-host {
  width: 100%;
  margin-top: 12px;
}

/* Hide toggle when controller declares no toggle needed */
.spc-controller[data-spc-no-toggle] .spc-view-toggle {
  display: none;
}

/* --------------------------------------------------------------------------
   10. Responsive — Tablet / Small screens
   -------------------------------------------------------------------------- */
@media (max-width: 640px) {
  .spc-row--primary {
    flex-wrap: wrap;
  }

  .spc-row--primary .spc-picker-nav {
    width: 100%;
    flex: unset;
  }

  .spc-row--primary .spc-view-toggle {
    margin-left: auto;
  }
}

/* Extra-small screens */
@media (max-width: 390px) {
  .spc-picker-pill {
    font-size: 13px;
    padding: 0 10px;
    min-height: 44px;
  }

  .spc-picker-prev,
  .spc-picker-next {
    width: 44px;
    height: 44px;
    font-size: 16px;
  }

  .spc-view-toggle-btn {
    min-height: 44px;
    padding: 0 10px;
    font-size: 12px;
  }

  .spc-sheet-header {
    padding: 12px 14px;
  }

  .spc-sheet-body {
    padding: 6px 14px 14px;
  }

  .spc-sheet-item {
    padding: 8px 10px;
  }
}

/* --------------------------------------------------------------------------
   11. Accessibility
   -------------------------------------------------------------------------- */

/* Focus-visible ring on all interactive elements */
.spc-picker-prev:focus-visible,
.spc-picker-next:focus-visible,
.spc-picker-pill:focus-visible,
.spc-view-toggle-btn:focus-visible,
.spc-active-chip:focus-visible,
.spc-sheet-close:focus-visible,
.spc-sheet-search:focus-visible,
.spc-sheet-item:focus-visible {
  outline: 2px solid var(--spc-color-primary);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .spc-controller,
  .spc-controller *,
  .spc-sheet,
  .spc-sheet-backdrop,
  .spc-picker-pill-arrow {
    transition-duration: 0ms !important;
    animation: none !important;
  }
}

/* Screen-reader only utility */
.spc-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;
}

/* --------------------------------------------------------------------------
   12. Settings Side Panel Styles (Adaptive Difficulty & Target Settings)
   -------------------------------------------------------------------------- */
.spc-mode-settings-sheet .spc-sheet-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.spc-settings-section {
  background: var(--bg-card, #ffffff);
  border: 1px solid var(--border-color, #e2e8f0);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 12px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.spc-settings-section-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-heading, #1e293b);
  margin: 0 0 12px 0;
  display: flex;
  align-items: center;
  gap: 8px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.spc-settings-section .adaptive-toggle-container {
  display: flex !important;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 8px;
}

.spc-settings-section .question-total,
.spc-settings-section .question-count-info {
  display: block !important;
  font-size: 0.85rem;
  color: var(--text-muted, #64748b);
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--border-color, #e2e8f0);
}

.spc-settings-section .question-filters-row {
  display: flex !important;
  flex-direction: column;
  gap: 10px;
  margin-top: 8px;
}

.spc-settings-section .status-filter-dropdown,
.spc-settings-section .length-filter-dropdown,
.spc-settings-section .difficulty-filter-dropdown {
  display: block !important;
  width: 100%;
}

.spc-settings-section .status-filter-btn,
.spc-settings-section .length-filter-btn,
.spc-settings-section .difficulty-filter-btn {
  width: 100%;
  justify-content: space-between;
}

/* Basic vs Advanced view distinction across practice modes */
#mode-read-aloud[data-spc-view="basic"] #ra-prompt-guides-group {
  display: none !important;
}

#mode-read-aloud[data-spc-view="advanced"] #ra-prompt-guides-group {
  display: flex !important;
}

/* Clean up Read Aloud prompt box container (remove double border and box-shadow per UI rules) */
#mode-read-aloud .ra-prompt-box.ra-card {
  border: none !important;
  box-shadow: none !important;
  background: transparent !important;
  padding: 0 !important;
}