/**
 * Preposition Practice Widget - Styles
 *
 * Warm purple theme for fill-in-the-blank preposition exercises.
 * Includes spatial scene layout with drop zones and creature tap-to-place.
 * Mobile-first, accessible, therapeutic design.
 *
 * @package Aphasia_Exercises
 * @since 1.5.75
 */

/* =========================================================================
   1. CSS CUSTOM PROPERTIES
   ========================================================================= */

.preposition-practice-root {
    --pp-primary: #7c5ce0;
    --pp-primary-dark: #5b3dbf;
    --pp-primary-light: #ede9fc;
    --pp-primary-ring: rgba(124, 92, 224, 0.3);
    --pp-success: #34d399;
    --pp-success-dark: #059669;
    --pp-success-light: #ecfdf5;
    --pp-error: #f87171;
    --pp-error-dark: #dc2626;
    --pp-error-light: #fef2f2;

    /* Neutrals */
    --pp-neutral-50: #faf7f2;
    --pp-neutral-100: #f3f0eb;
    --pp-neutral-200: #e5e1dc;
    --pp-neutral-300: #d1cdc8;
    --pp-neutral-400: #9ca3af;
    --pp-neutral-500: #6b7280;
    --pp-neutral-600: #4b5563;
    --pp-neutral-700: #374151;
    --pp-neutral-800: #1f2937;

    /* Typography & Layout */
    --pp-font: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --pp-radius-full: 9999px;
    --pp-radius-xl: 16px;
    --pp-radius-lg: 12px;
    --pp-radius-md: 8px;
    --pp-radius-sm: 6px;

    /* Shadows — softer, warmer */
    --pp-shadow-sm: 0 1px 2px rgba(124, 92, 224, 0.06);
    --pp-shadow: 0 1px 3px rgba(124, 92, 224, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
    --pp-shadow-md: 0 4px 12px rgba(124, 92, 224, 0.1), 0 2px 4px rgba(0, 0, 0, 0.04);
    --pp-shadow-lg: 0 10px 20px rgba(124, 92, 224, 0.12), 0 4px 8px rgba(0, 0, 0, 0.04);

    --pp-transition: 0.2s ease;

    /* Shared component theme mapping (ex- classes) */
    --ex-primary: var(--pp-primary);
    --ex-primary-dark: var(--pp-primary-dark);
    --ex-primary-light: var(--pp-primary-light);
    --ex-primary-ring: var(--pp-primary-ring);
    --ex-success: var(--pp-success);
    --ex-success-light: var(--pp-success-light);
    --ex-success-dark: var(--pp-success-dark);
    --ex-error: var(--pp-error);
    --ex-error-light: var(--pp-error-light);
    --ex-error-dark: var(--pp-error-dark);
    --ex-neutral-50: var(--pp-neutral-50);
    --ex-neutral-100: var(--pp-neutral-100);
    --ex-neutral-200: var(--pp-neutral-200);
    --ex-neutral-500: var(--pp-neutral-500);
    --ex-neutral-700: var(--pp-neutral-700);
    --ex-neutral-800: var(--pp-neutral-800);
    --ex-radius-sm: var(--pp-radius-sm);
    --ex-radius-md: var(--pp-radius-md);
    --ex-radius-lg: var(--pp-radius-lg);
    --ex-radius-full: var(--pp-radius-full);
    --ex-shadow-sm: var(--pp-shadow-sm);
    --ex-transition: var(--pp-transition);
    --ex-font: var(--pp-font);
}

/* =========================================================================
   2. ELEMENTOR BUTTON RESET
   ========================================================================= */

.elementor-kit-15048 .preposition-practice-root button:not(.te-mh-gear):not(.te-mh-path):not(.pp-flag-btn),
.elementor-kit-15048 .preposition-practice-container button:not(.te-mh-gear):not(.te-mh-path):not(.pp-flag-btn) {
    background-color: transparent;
    border-color: transparent;
    color: inherit;
    padding: 0;
    font-size: inherit;
    line-height: inherit;
    letter-spacing: inherit;
    text-transform: none;
    border-radius: 0;
    box-shadow: none;
    min-height: auto;
}

/* =========================================================================
   3. BASE CONTAINER
   ========================================================================= */

.preposition-practice-root {
    font-family: var(--pp-font);
    font-size: 16px;
    line-height: 1.5;
    color: var(--pp-neutral-800);
    max-width: 100%;
    box-sizing: border-box;
}

.preposition-practice-root *,
.preposition-practice-root *::before,
.preposition-practice-root *::after {
    box-sizing: border-box;
}

.preposition-practice-container {
    background: var(--pp-neutral-50);
    border-radius: var(--pp-radius-xl);
    box-shadow: var(--pp-shadow-md);
    padding: 24px;
    max-width: 680px;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
}

/* =========================================================================
   4. HEADER
   ========================================================================= */

.pp-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 12px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--pp-neutral-200);
}

.pp-header-left {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
}

.pp-exercise-type {
    font-size: 12px;
    font-weight: 600;
    color: var(--pp-primary-dark);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.preposition-practice-container .pp-exercise-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--pp-neutral-800);
    margin: 0;
    padding: 0;
    line-height: 1.3;
}

.pp-settings-toggle {
    background: var(--pp-neutral-100);
    border: 1px solid var(--pp-neutral-200);
    border-radius: var(--pp-radius-md);
    padding: 6px 10px;
    font-size: 18px;
    cursor: pointer;
    transition: background var(--pp-transition);
    line-height: 1;
    flex-shrink: 0;
}

.pp-settings-toggle:hover {
    background: var(--pp-neutral-200);
}

.pp-settings-toggle.active {
    background: var(--pp-primary-light);
    border-color: var(--pp-primary);
    color: var(--pp-primary-dark);
}

/* =========================================================================
   5. SETTINGS PANEL
   ========================================================================= */

.pp-settings-panel {
    background: #fff;
    border: 1px solid var(--pp-neutral-200);
    border-radius: var(--pp-radius-lg);
    padding: 16px;
    margin-bottom: 16px;
}

.pp-setting-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.pp-setting-row label {
    font-size: 14px;
    font-weight: 600;
    color: var(--pp-neutral-700);
    white-space: nowrap;
}

.pp-setting-select {
    padding: 8px 12px;
    border: 1px solid var(--pp-neutral-300);
    border-radius: var(--pp-radius-md);
    font-size: 14px;
    background: #fff;
    color: var(--pp-neutral-800);
    cursor: pointer;
    min-width: 200px;
}

.pp-setting-select:focus {
    outline: 3px solid var(--pp-primary);
    outline-offset: 2px;
    border-color: var(--pp-primary);
}

/* =========================================================================
   6. STORY PROGRESS BAR (Instagram-style, top of scene)
   ========================================================================= */

.pp-story-bar {
    display: flex;
    gap: 3px;
    margin-bottom: 12px;
}

.pp-story-segment {
    flex: 1;
    height: 4px;
    border-radius: 2px;
    background: var(--pp-neutral-200);
    transition: background 0.3s ease;
    overflow: hidden;
}

.pp-story-segment.correct {
    background: var(--pp-success);
}

.pp-story-segment.incorrect {
    background: var(--pp-error);
}

.pp-story-segment.current {
    background: var(--pp-primary);
    animation: ppStoryPulse 2s ease-in-out infinite;
}

@keyframes ppStoryPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* =========================================================================
   7. SCENE AREA (visual context above sentence)
   ========================================================================= */

.pp-scene-image-area {
    border-radius: var(--pp-radius-lg);
    padding: 32px 20px;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 140px;
    transition: background 0.5s ease;
}

.pp-scene-emoji {
    font-size: 72px;
    line-height: 1;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
    transition: transform 0.3s ease;
}

.pp-scene-emoji.pp-pop {
    animation: ppScenePop 0.4s ease;
}

@keyframes ppScenePop {
    0% { transform: scale(1); }
    40% { transform: scale(1.15); }
    100% { transform: scale(1); }
}

/* =========================================================================
   8. SENTENCE DISPLAY (MC + Typing modes)
   ========================================================================= */

.pp-sentence-display {
    padding: 24px 16px;
    background: #fff;
    border: 2px solid var(--pp-neutral-200);
    border-radius: var(--pp-radius-lg);
    margin-bottom: 16px;
    transition: border-color var(--pp-transition), background var(--pp-transition);
    text-align: center;
}

.pp-sentence-display.pp-feedback-correct {
    border-color: var(--pp-success);
    background: var(--pp-success-light);
}

.pp-sentence-display.pp-feedback-incorrect {
    border-color: var(--pp-error);
    background: var(--pp-error-light);
}

.pp-sentence-words {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
    align-items: baseline;
    font-size: 22px;
    line-height: 1.6;
}

.pp-word {
    color: var(--pp-neutral-800);
    font-weight: 500;
}

.pp-blank-slot {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 56px;
    min-height: 40px;
    padding: 4px 12px;
    border-radius: var(--pp-radius-md);
    font-weight: 700;
    font-size: 22px;
    transition: all var(--pp-transition);
}

.pp-blank-slot.empty {
    border: 2px dashed var(--pp-neutral-300);
    background: #fff;
    color: transparent;
}

.pp-blank-slot.empty.active {
    border-color: var(--pp-primary);
    background: var(--pp-primary-light);
    animation: ppPulse 1.5s ease-in-out infinite;
}

.pp-blank-slot.filled {
    border: 2px solid var(--pp-primary);
    background: var(--pp-primary-light);
    color: var(--pp-primary-dark);
    animation: ppBlankPop 0.3s ease;
}

.pp-blank-slot.filled.correct {
    border-color: var(--pp-success);
    background: var(--pp-success-light);
    color: var(--pp-success-dark);
}

.pp-blank-slot.filled.incorrect {
    border-color: var(--pp-error);
    background: var(--pp-error-light);
    color: var(--pp-error-dark);
}

@keyframes ppPulse {
    0%, 100% { border-color: var(--pp-primary); }
    50% { border-color: var(--pp-primary-ring); }
}

@keyframes ppBlankPop {
    0% { transform: scale(0.8); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

/* =========================================================================
   9. FEEDBACK (MC + Typing modes)
   ========================================================================= */

.pp-feedback {
    text-align: center;
    padding: 12px 16px;
    border-radius: var(--pp-radius-lg);
    margin-bottom: 16px;
    animation: ppFadeIn 0.3s ease;
}

.pp-feedback.pp-feedback-correct {
    background: var(--pp-success-light);
    border: 1px solid var(--pp-success);
}

.pp-feedback.pp-feedback-incorrect {
    background: var(--pp-error-light);
    border: 1px solid var(--pp-error);
}

.preposition-practice-container .pp-feedback p {
    margin: 0;
    font-size: 17px;
    font-weight: 700;
}

.pp-feedback.pp-feedback-correct p {
    color: var(--pp-success-dark);
}

.pp-feedback.pp-feedback-incorrect p {
    color: var(--pp-error-dark);
}

@keyframes ppFadeIn {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* =========================================================================
   10. CHOICES (MC buttons)
   ========================================================================= */

.pp-choices {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    padding: 16px;
    background: #fff;
    border-radius: var(--pp-radius-lg);
}

.pp-choice-btn {
    min-width: 72px;
    min-height: 52px;
    padding: 12px 28px;
    background: #fff;
    border: 2px solid var(--pp-neutral-300);
    border-radius: var(--pp-radius-lg);
    font-size: 20px;
    font-weight: 700;
    color: var(--pp-neutral-800);
    cursor: pointer;
    transition: all var(--pp-transition);
    box-shadow: var(--pp-shadow-sm);
    text-align: center;
}

.pp-choice-btn:hover:not(.used):not(:disabled) {
    background: var(--pp-primary-light);
    border-color: var(--pp-primary);
    color: var(--pp-primary-dark);
    box-shadow: var(--pp-shadow);
    transform: translateY(-2px);
}

.pp-choice-btn:active:not(.used):not(:disabled) {
    transform: translateY(0);
    box-shadow: var(--pp-shadow-sm);
}

.pp-choice-btn:focus-visible {
    outline: 3px solid var(--pp-primary);
    outline-offset: 2px;
}

.pp-choice-btn.used {
    opacity: 0.3;
    cursor: default;
    transform: scale(0.95);
    box-shadow: none;
}

/* =========================================================================
   10b. TYPING INPUT
   ========================================================================= */

.pp-typing-area {
    display: flex;
    gap: 10px;
    justify-content: center;
    align-items: center;
    padding: 16px;
    background: #fff;
    border-radius: var(--pp-radius-lg);
}

.pp-typing-input {
    flex: 1;
    max-width: 280px;
    padding: 12px 16px;
    font-size: 20px;
    font-weight: 600;
    font-family: var(--pp-font);
    border: 2px solid var(--pp-neutral-300);
    border-radius: var(--pp-radius-md);
    background: #fff;
    color: var(--pp-neutral-800);
    text-align: center;
    outline: none;
    transition: border-color var(--pp-transition), box-shadow var(--pp-transition);
}

.pp-typing-input:focus {
    border-color: var(--pp-primary);
    box-shadow: 0 0 0 3px var(--pp-primary-ring);
}

.pp-typing-input::placeholder {
    color: var(--pp-neutral-400);
    font-weight: 400;
    font-size: 15px;
}

.pp-typing-check {
    flex-shrink: 0;
}

.pp-typing-check:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* =========================================================================
   11. MODE TOGGLE (moved to bottom of card)
   ========================================================================= */

.pp-mode-toggle {
    display: flex;
    gap: 4px;
    background: var(--pp-neutral-100);
    border-radius: var(--pp-radius-md);
    padding: 4px;
    margin-top: 12px;
}

.pp-mode-btn {
    flex: 1;
    padding: 8px 12px;
    font-size: 13px;
    font-weight: 600;
    border: 2px solid transparent;
    border-radius: var(--pp-radius-sm);
    cursor: pointer;
    transition: all var(--pp-transition);
    background: transparent;
    color: var(--pp-neutral-500);
    text-align: center;
    min-height: 44px;
}

.preposition-practice-container .pp-mode-btn.active {
    background: #fff;
    color: var(--pp-primary-dark);
    border-color: var(--pp-primary);
    box-shadow: var(--pp-shadow-sm);
}

.pp-mode-btn:hover:not(.active):not(.locked) {
    color: var(--pp-neutral-700);
    background: rgba(255, 255, 255, 0.5);
}

.pp-mode-btn.locked {
    opacity: 0.6;
    cursor: not-allowed;
}

/* =========================================================================
   11b. PROGRESS COUNTER (bottom of card)
   ========================================================================= */

.pp-progress-counter {
    text-align: center;
    font-size: 14px;
    font-weight: 600;
    color: var(--pp-neutral-400);
    margin-top: 8px;
    letter-spacing: 0.5px;
}

/* =========================================================================
   12. SPATIAL SCENE
   ========================================================================= */

.pp-spatial-scene {
    margin-bottom: 16px;
}

.pp-spatial-prompt {
    text-align: center;
    margin-bottom: 12px;
}

.preposition-practice-container .pp-spatial-prompt p {
    font-size: 20px;
    font-weight: 700;
    color: var(--pp-neutral-800);
    margin: 0;
}

/* Scene area: grid container for furniture + zones */
.pp-scene-area {
    position: relative;
    min-height: 280px;
    border: 2px solid var(--pp-neutral-200);
    border-radius: var(--pp-radius-lg);
    padding: 20px;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: auto auto auto;
    gap: 10px;
    justify-items: center;
    align-items: center;
    transition: border-color var(--pp-transition), background var(--pp-transition);
    overflow: visible;
}

.pp-scene-area.pp-feedback-correct {
    border-color: var(--pp-success);
}

.pp-scene-area.pp-feedback-incorrect {
    border-color: var(--pp-error);
}

/* Furniture */
.pp-furniture {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    z-index: 1;
    grid-column: 2;
    grid-row: 2;
}

.pp-furniture-emoji {
    font-size: 72px;
    line-height: 1;
    filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.12));
}

.pp-furniture-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--pp-neutral-600);
    text-transform: capitalize;
}

/* Drop zones */
.pp-drop-zone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    min-width: 80px;
    min-height: 60px;
    padding: 8px 12px;
    border: 2px dashed var(--pp-neutral-300);
    border-radius: var(--pp-radius-lg);
    background: rgba(255, 255, 255, 0.6);
    cursor: pointer;
    transition: all var(--pp-transition);
}

.pp-drop-zone:hover {
    border-color: var(--pp-primary);
    background: rgba(255, 255, 255, 0.9);
    transform: scale(1.05);
}

.pp-drop-zone.tap-active {
    border-color: var(--pp-primary);
    background: var(--pp-primary-light);
    animation: ppZonePulse 1s ease-in-out infinite;
}

.pp-drop-zone.selected {
    border-style: solid;
    border-color: var(--pp-primary);
    background: var(--pp-primary-light);
}

.pp-drop-zone.correct {
    border-color: var(--pp-success);
    background: var(--pp-success-light);
}

.pp-drop-zone.incorrect {
    border-color: var(--pp-error);
    background: var(--pp-error-light);
    animation: ppShake 0.4s ease;
}

@keyframes ppZonePulse {
    0%, 100% { box-shadow: 0 0 0 0 var(--pp-primary-ring); }
    50% { box-shadow: 0 0 0 6px transparent; }
}

@keyframes ppShake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-4px); }
    40% { transform: translateX(4px); }
    60% { transform: translateX(-4px); }
    80% { transform: translateX(4px); }
}

.pp-zone-label {
    font-size: 13px;
    font-weight: 700;
    color: var(--pp-neutral-600);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.pp-zone-creature {
    font-size: 32px;
    line-height: 1;
    animation: ppBounceIn 0.3s ease;
}

@keyframes ppBounceIn {
    0% { transform: scale(0); }
    60% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

/* Zone grid positions */
.pp-zone-on { grid-column: 2; grid-row: 1; }
.pp-zone-under { grid-column: 2; grid-row: 3; }
.pp-zone-in { grid-column: 2; grid-row: 2; z-index: 2; background: rgba(255, 255, 255, 0.8); }
.pp-zone-behind { grid-column: 1; grid-row: 2; }
.pp-zone-beside { grid-column: 3; grid-row: 2; }

/* Creature indicator (tap-to-place) */
.pp-creature-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px;
    text-align: center;
}

.pp-creature-indicator .pp-creature-emoji {
    font-size: 48px;
    line-height: 1;
    animation: ppCreatureBob 2s ease-in-out infinite;
}

@keyframes ppCreatureBob {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
}

.pp-creature-hint {
    font-size: 14px;
    font-weight: 600;
    color: var(--pp-neutral-500);
    white-space: nowrap;
}

/* Spatial feedback */
.pp-spatial-feedback {
    text-align: center;
    padding: 10px 16px;
    border-radius: var(--pp-radius-lg);
    margin-top: 12px;
    animation: ppFadeIn 0.3s ease;
}

.pp-spatial-feedback.pp-feedback-correct {
    background: var(--pp-success-light);
    border: 1px solid var(--pp-success);
}

.pp-spatial-feedback.pp-feedback-incorrect {
    background: var(--pp-error-light);
    border: 1px solid var(--pp-error);
}

.preposition-practice-container .pp-spatial-feedback p {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
}

.pp-spatial-feedback.pp-feedback-correct p {
    color: var(--pp-success-dark);
}

.pp-spatial-feedback.pp-feedback-incorrect p {
    color: var(--pp-error-dark);
}

/* =========================================================================
   13. BUTTONS (general)
   ========================================================================= */

.pp-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border: 2px solid transparent;
    border-radius: var(--pp-radius-md);
    font-family: var(--pp-font);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--pp-transition);
    text-decoration: none;
    line-height: 1.4;
    min-height: 44px;
}

.pp-btn-primary {
    background: var(--pp-primary);
    color: #fff;
    border-color: var(--pp-primary);
}

.pp-btn-primary:hover {
    background: var(--pp-primary-dark);
    border-color: var(--pp-primary-dark);
}

.pp-btn-secondary {
    background: #fff;
    color: var(--pp-primary-dark);
    border-color: var(--pp-primary);
}

.pp-btn-secondary:hover {
    background: var(--pp-primary-light);
}

.pp-btn:focus-visible {
    outline: 3px solid var(--pp-primary);
    outline-offset: 2px;
}

/* =========================================================================
   13b. PROGRESS PIPS ROW (legacy — kept for compatibility)
   ========================================================================= */

.pp-pips-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 10px 0 0;
    gap: 8px;
}

.pp-pips {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    align-items: center;
    flex: 1;
    min-width: 0;
}

.pp-pip {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--pp-neutral-200);
    flex-shrink: 0;
    transition: background 0.2s ease, transform 0.2s ease;
}

.pp-pip.correct { background: var(--pp-success); animation: ppPipPop 0.3s ease; }
.pp-pip.incorrect { background: var(--pp-error); animation: ppPipPop 0.3s ease; }
.pp-pip.current { background: var(--pp-primary); transform: scale(1.3); }

@keyframes ppPipPop {
    0% { transform: scale(0.5); }
    60% { transform: scale(1.3); }
    100% { transform: scale(1); }
}

/* Flag button */
.preposition-practice-root .pp-flag-btn,
.preposition-practice-container .pp-flag-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 6px 10px;
    border: none;
    border-radius: 8px;
    background: transparent;
    cursor: pointer;
    font-size: 14px;
    opacity: 0.25;
    transition: opacity 0.15s ease;
    margin: 0;
    min-height: 44px;
}

.preposition-practice-root .pp-flag-btn:hover,
.preposition-practice-container .pp-flag-btn:hover {
    opacity: 0.6;
}

/* =========================================================================
   13c. SETTINGS GRID (merged header panel)
   ========================================================================= */

.pp-settings-grid {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.pp-setting-group {
    flex: 1;
    min-width: 0;
}

.pp-settings-grid .pp-setting-select {
    width: 100%;
}

/* =========================================================================
   14. CONFETTI
   ========================================================================= */

.pp-confetti-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
    z-index: 100;
}

.pp-confetti-particle {
    position: absolute;
    width: 8px;
    height: 8px;
    border-radius: 2px;
    top: 40%;
    animation: ppConfettiFall 1.2s ease-out forwards;
    opacity: 0;
}

@keyframes ppConfettiFall {
    0% {
        opacity: 1;
        transform: translate(0, 0) rotate(0deg) scale(1);
    }
    100% {
        opacity: 0;
        transform: translate(var(--pp-confetti-x), var(--pp-confetti-y)) rotate(var(--pp-confetti-r)) scale(0.5);
    }
}

/* =========================================================================
   15. COMPLETE SCREEN
   ========================================================================= */

.pp-complete-screen {
    text-align: center;
    padding: 24px 16px;
}

.pp-complete-emoji {
    font-size: 56px;
    margin-bottom: 12px;
    line-height: 1;
}

.preposition-practice-container .pp-complete-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--pp-neutral-800);
    margin: 0 0 8px;
}

.pp-complete-stats {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 24px;
}

.pp-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.pp-stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--pp-primary-dark);
    line-height: 1;
}

.pp-stat-label {
    font-size: 13px;
    color: var(--pp-neutral-500);
    font-weight: 500;
}

/* =========================================================================
   16. LOGIN PROMPT
   ========================================================================= */

.pp-login-prompt {
    text-align: center;
    padding: 32px 16px;
}

.preposition-practice-container .pp-login-prompt h3 {
    font-size: 20px;
    font-weight: 700;
    margin: 0 0 8px;
    color: var(--pp-neutral-800);
}

.preposition-practice-container .pp-login-prompt p {
    font-size: 15px;
    color: var(--pp-neutral-500);
    margin: 0 0 20px;
}

.pp-login-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
}

/* =========================================================================
   17. LOADING & ERROR STATES
   ========================================================================= */

.pp-loading,
.pp-error {
    text-align: center;
    padding: 32px 16px;
    color: var(--pp-neutral-500);
}

.preposition-practice-loading {
    text-align: center;
    padding: 32px 16px;
    color: var(--pp-neutral-500);
}

/* =========================================================================
   18. ACCESSIBILITY
   ========================================================================= */

.pp-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

@media (prefers-reduced-motion: reduce) {
    .preposition-practice-root *,
    .preposition-practice-root *::before,
    .preposition-practice-root *::after {
        animation-duration: 0.01ms;
        transition-duration: 0.01ms;
    }
}

/* =========================================================================
   19. RESPONSIVE — TABLET (768px)
   ========================================================================= */

@media (max-width: 768px) {
    .preposition-practice-container {
        padding: 18px;
        border-radius: var(--pp-radius-lg);
    }

    .pp-scene-image-area {
        min-height: 110px;
        padding: 24px 16px;
    }

    .pp-scene-emoji {
        font-size: 56px;
    }

    .pp-sentence-words {
        font-size: 20px;
    }

    .pp-blank-slot {
        font-size: 20px;
        min-width: 48px;
        min-height: 36px;
    }

    .pp-choice-btn {
        padding: 8px 18px;
        font-size: 18px;
        min-height: 44px;
    }

    .pp-scene-area {
        min-height: 240px;
        padding: 16px;
    }

    .pp-furniture-emoji {
        font-size: 56px;
    }

    .pp-creature-emoji {
        font-size: 40px;
    }

    .pp-complete-stats {
        gap: 16px;
    }

    .pp-stat-value {
        font-size: 24px;
    }
}

/* =========================================================================
   20. RESPONSIVE — MOBILE (500px)
   ========================================================================= */

@media (max-width: 500px) {
    .preposition-practice-container {
        padding: 14px;
    }

    .pp-header-left {
        flex-direction: column;
        align-items: flex-start;
        gap: 2px;
    }

    .preposition-practice-container .pp-exercise-title {
        font-size: 17px;
    }

    .pp-exercise-type {
        font-size: 11px;
    }

    .pp-setting-select {
        min-width: 0;
        flex: 1;
    }

    .pp-scene-image-area {
        min-height: 90px;
        padding: 20px 12px;
    }

    .pp-scene-emoji {
        font-size: 48px;
    }

    .pp-sentence-display {
        padding: 16px 12px;
    }

    .pp-sentence-words {
        font-size: 18px;
        gap: 4px;
    }

    .pp-blank-slot {
        font-size: 18px;
        min-width: 44px;
        padding: 3px 8px;
    }

    .pp-choice-btn {
        padding: 8px 16px;
        font-size: 17px;
        min-width: 60px;
    }

    .pp-mode-btn {
        font-size: 12px;
        padding: 7px 8px;
    }

    .pp-scene-area {
        min-height: 220px;
        padding: 12px;
        gap: 8px;
    }

    .pp-drop-zone {
        min-width: 64px;
        min-height: 52px;
        padding: 6px 8px;
    }

    .pp-zone-label {
        font-size: 11px;
    }

    .pp-furniture-emoji {
        font-size: 48px;
    }

    .pp-creature-emoji {
        font-size: 36px;
    }

    .pp-login-buttons {
        flex-direction: column;
    }
}

/* =========================================================================
   21. RESPONSIVE — SMALL PHONES (360px)
   ========================================================================= */

@media (max-width: 360px) {
    .preposition-practice-container {
        padding: 10px;
    }

    .pp-sentence-words {
        font-size: 16px;
    }

    .pp-blank-slot {
        font-size: 16px;
        min-width: 40px;
        min-height: 32px;
    }

    .pp-choice-btn {
        padding: 8px 12px;
        font-size: 16px;
        min-width: 52px;
        min-height: 44px;
    }

    .pp-choices {
        gap: 8px;
        padding: 12px;
    }

    .pp-scene-area {
        min-height: 200px;
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto auto auto auto;
    }

    .pp-furniture {
        grid-column: 1 / -1;
        grid-row: 1;
    }

    .pp-zone-on { grid-column: 1; grid-row: 2; }
    .pp-zone-in { grid-column: 2; grid-row: 2; }
    .pp-zone-under { grid-column: 1; grid-row: 3; }
    .pp-zone-behind { grid-column: 2; grid-row: 3; }
    .pp-zone-beside { grid-column: 1 / -1; grid-row: 4; }

    .pp-complete-stats {
        flex-direction: column;
        gap: 12px;
    }
}