/* ========================================
   Reading - WisePTE
   CSS Design System (Inline Questions)
   ======================================== */

/* ----------------------------------------
   CSS Custom Properties (Design Tokens)
   ---------------------------------------- */
:root {
    /* Colors - Primary (Indigo) */
    --color-primary-50: #eef2ff;
    --color-primary-100: #e0e7ff;
    --color-primary-200: #c7d2fe;
    --color-primary-300: #a5b4fc;
    --color-primary-400: #818cf8;
    --color-primary-500: #6366f1;
    --color-primary-600: #4f46e5;
    --color-primary-700: #4338ca;
    --color-primary-800: #3730a3;
    --color-primary-900: #312e81;

    /* Colors - Neutral */
    --color-neutral-50: #fafafa;
    --color-neutral-100: #f4f4f5;
    --color-neutral-200: #e4e4e7;
    --color-neutral-300: #d4d4d8;
    --color-neutral-400: #a1a1aa;
    --color-neutral-500: #71717a;
    --color-neutral-600: #52525b;
    --color-neutral-700: #3f3f46;
    --color-neutral-800: #27272a;
    --color-neutral-900: #18181b;

    /* Colors - Semantic */
    --color-success-50: #ecfdf5;
    --color-success-100: #d1fae5;
    --color-success-500: #10b981;
    --color-success-600: #059669;
    --color-success-700: #047857;
    
    --color-error-50: #fef2f2;
    --color-error-100: #fee2e2;
    --color-error-500: #ef4444;
    --color-error-600: #dc2626;
    --color-error-700: #b91c1c;

    --color-warning-50: #fffbeb;
    --color-warning-100: #fef3c7;
    --color-warning-500: #f59e0b;
    --color-warning-600: #d97706;

    /* Typography */
    --font-family-base: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Layout */
    --container-max-width: 800px;
    --reading-max-width: 70ch;
}

/* ----------------------------------------
   Base Styles & Reset
   ---------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-neutral-800);
    background: linear-gradient(180deg, var(--color-primary-50) 0%, #ffffff 30%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Accessibility - Skip Link */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--spacing-4);
    background: var(--color-primary-600);
    color: white;
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    z-index: 1000;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: var(--spacing-4);
}

/* ----------------------------------------
   Layout Components
   ---------------------------------------- */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

.hidden {
    display: none !important;
}

/* ----------------------------------------
   Header
   ---------------------------------------- */
.app-header {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-neutral-200);
    padding: var(--spacing-4) 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.app-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-4);
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.logo-reading {
    color: var(--color-neutral-800);
}

.logo-divider {
    color: var(--color-neutral-400);
}

.logo-wisepte {
    background: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-700));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.score-display {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-4);
    background: var(--color-primary-50);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
}

.score-label {
    color: var(--color-neutral-500);
}

.score-value {
    font-weight: var(--font-weight-bold);
    color: var(--color-primary-700);
}

/* ----------------------------------------
   Buttons
   ---------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-5);
    font-family: inherit;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

.btn:focus-visible {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-600));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-primary-600), var(--color-primary-700));
    box-shadow: var(--shadow-lg);
    transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-secondary {
    background: white;
    color: var(--color-neutral-700);
    border: 1px solid var(--color-neutral-300);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-neutral-50);
    border-color: var(--color-neutral-400);
}

.btn-ghost {
    background: transparent;
    color: var(--color-neutral-600);
    padding: var(--spacing-2) var(--spacing-3);
}

.btn-ghost:hover:not(:disabled) {
    background: var(--color-neutral-100);
    color: var(--color-neutral-800);
}

.btn-large {
    padding: var(--spacing-4) var(--spacing-8);
    font-size: var(--font-size-lg);
    border-radius: var(--radius-xl);
}

.btn-question {
    background: linear-gradient(135deg, var(--color-primary-100), var(--color-primary-50));
    color: var(--color-primary-700);
    border: 2px solid var(--color-primary-200);
    padding: var(--spacing-3) var(--spacing-6);
    font-weight: var(--font-weight-semibold);
}

.btn-question:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-primary-200), var(--color-primary-100));
    border-color: var(--color-primary-400);
    transform: scale(1.02);
}

.btn-question.completed {
    background: var(--color-success-50);
    color: var(--color-success-700);
    border-color: var(--color-success-500);
    pointer-events: none;
}

.btn-success {
    background: linear-gradient(135deg, var(--color-success-500), var(--color-success-600));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-success:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-success-600), var(--color-success-700));
}

/* ----------------------------------------
   Main Content
   ---------------------------------------- */
.main-content {
    flex: 1;
    padding: var(--spacing-8) 0;
}

/* ----------------------------------------
   Article Section
   ---------------------------------------- */
.article-section {
    background: white;
    border-radius: var(--radius-2xl);
    padding: var(--spacing-8);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--color-neutral-200);
}

.article-header {
    margin-bottom: var(--spacing-8);
    padding-bottom: var(--spacing-6);
    border-bottom: 1px solid var(--color-neutral-200);
}

.article-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-neutral-900);
    line-height: var(--line-height-tight);
    margin-bottom: var(--spacing-3);
}

.article-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.unlock-progress {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-sm);
    color: var(--color-neutral-500);
}

.unlock-progress svg {
    color: var(--color-primary-500);
}

/* ----------------------------------------
   Paragraphs
   ---------------------------------------- */
.paragraphs-container {
    width: 100%;
}

.paragraph-block {
    margin-bottom: var(--spacing-6);
    position: relative;
}

.paragraph-content {
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    color: var(--color-neutral-700);
    transition: all var(--transition-slow);
}

/* Locked paragraphs */
.paragraph-block.locked {
    position: relative;
}

.paragraph-block.locked .paragraph-content {
    filter: blur(5px);
    user-select: none;
    pointer-events: none;
    color: var(--color-neutral-400);
}

.paragraph-block.locked::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(255,255,255,0.6) 100%);
    pointer-events: none;
    border-radius: var(--radius-md);
    z-index: 1;
}

/* Lock notification overlay */
.lock-notification {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 2;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    padding: var(--spacing-4) var(--spacing-6);
    border-radius: var(--radius-xl);
    border: 2px solid var(--color-neutral-200);
    box-shadow: var(--shadow-lg);
    text-align: center;
    max-width: 280px;
}

.lock-notification-icon {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-2);
}

.lock-notification-text {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-neutral-600);
    line-height: var(--line-height-normal);
}

.lock-notification-text strong {
    color: var(--color-primary-600);
}

/* Unlocked animation */
.paragraph-block.unlocking .paragraph-content {
    animation: unlock 0.8s ease forwards;
}

@keyframes unlock {
    from {
        filter: blur(5px);
        opacity: 0.5;
    }
    to {
        filter: blur(0);
        opacity: 1;
    }
}

/* Question trigger area */
.paragraph-actions {
    margin-top: var(--spacing-4);
    display: flex;
    justify-content: center;
}

/* Completed paragraph badge */
.paragraph-completed {
    margin-top: var(--spacing-4);
    display: flex;
    justify-content: center;
}

.completed-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-4);
    background: var(--color-success-50);
    color: var(--color-success-700);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-full);
    border: 2px solid var(--color-success-500);
}

/* ----------------------------------------
   Inline Questions Section
   ---------------------------------------- */
.questions-section {
    margin-top: var(--spacing-4);
    margin-bottom: var(--spacing-4);
    padding: var(--spacing-6);
    background: linear-gradient(135deg, var(--color-primary-50) 0%, var(--color-neutral-50) 100%);
    border-radius: var(--radius-xl);
    border: 2px solid var(--color-primary-200);
    animation: slideDown var(--transition-slow);
}

@keyframes slideDown {
    from {
        opacity: 0;
        max-height: 0;
        padding: 0 var(--spacing-6);
        margin: 0;
    }
    to {
        opacity: 1;
        max-height: 2000px;
    }
}

.questions-section-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-5);
}

.questions-section-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-primary-500);
    color: white;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-lg);
}

.questions-section-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-neutral-800);
}

.questions-section-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-neutral-500);
}

.questions-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-5);
}

.questions-actions {
    margin-top: var(--spacing-6);
    display: flex;
    justify-content: center;
}

/* Questions progress indicator */
.questions-progress {
    margin-top: var(--spacing-6);
    text-align: center;
}

.progress-complete {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3);
    background: var(--color-success-50);
    border-radius: var(--radius-lg);
    color: var(--color-success-700);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-4);
}

.progress-check {
    font-size: var(--font-size-lg);
}

.progress-incomplete {
    padding: var(--spacing-3);
    background: var(--color-neutral-100);
    border-radius: var(--radius-lg);
    color: var(--color-neutral-600);
    font-size: var(--font-size-sm);
}

/* ----------------------------------------
   Question Cards (Inline)
   ---------------------------------------- */
.question-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-5);
    border: 2px solid var(--color-neutral-200);
    box-shadow: var(--shadow-sm);
    position: relative;
}

.question-card.submitted {
    border-color: var(--color-neutral-300);
    background: var(--color-neutral-50);
}

/* Question submit area with spacing */
.question-submit-area {
    margin-top: var(--spacing-5);
    padding-top: var(--spacing-4);
    border-top: 1px solid var(--color-neutral-200);
}

.btn-submit-question {
    width: 100%;
}

/* Question feedback inline */
.question-feedback {
    margin-top: var(--spacing-4);
    padding: var(--spacing-4);
    border-radius: var(--radius-lg);
    animation: fadeIn var(--transition-base);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

.question-feedback.correct {
    background: var(--color-success-50);
    border: 1px solid var(--color-success-200);
}

.question-feedback.incorrect {
    background: var(--color-error-50);
    border: 1px solid var(--color-error-200);
}

.question-feedback-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-2);
}

.question-feedback-status.correct {
    color: var(--color-success-700);
}

.question-feedback-status.incorrect {
    color: var(--color-error-700);
}

.question-feedback-answer {
    font-size: var(--font-size-sm);
    color: var(--color-neutral-700);
    margin-bottom: var(--spacing-2);
}

.question-feedback-explanation {
    font-size: var(--font-size-sm);
    color: var(--color-neutral-600);
    line-height: var(--line-height-relaxed);
}

.question-retry-hint {
    margin-top: var(--spacing-3);
    padding-top: var(--spacing-2);
    border-top: 1px dashed var(--color-neutral-300);
    font-size: var(--font-size-xs);
    color: var(--color-neutral-500);
    font-style: italic;
}

.question-type-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-1);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary-600);
    background: var(--color-primary-100);
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-3);
}

.question-text {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-neutral-800);
    margin-bottom: var(--spacing-4);
    line-height: var(--line-height-normal);
}

/* ----------------------------------------
   MCQ Options (Single & Multiple)
   ---------------------------------------- */
.options-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
    list-style: none;
}

.option-item {
    position: relative;
}

.option-input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.option-label {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-3);
    padding: var(--spacing-3) var(--spacing-4);
    background: var(--color-neutral-50);
    border: 2px solid var(--color-neutral-200);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.option-label:hover {
    background: var(--color-neutral-100);
    border-color: var(--color-neutral-300);
}

.option-input:checked + .option-label {
    background: var(--color-primary-50);
    border-color: var(--color-primary-400);
}

.option-input:focus-visible + .option-label {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

.option-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border: 2px solid var(--color-neutral-300);
    border-radius: var(--radius-full);
    flex-shrink: 0;
    transition: all var(--transition-fast);
    margin-top: 2px;
}

/* Checkbox style for multiple choice */
.option-indicator.checkbox {
    border-radius: var(--radius-sm);
}

.option-input:checked + .option-label .option-indicator {
    background: var(--color-primary-500);
    border-color: var(--color-primary-500);
}

.option-input:checked + .option-label .option-indicator::after {
    content: '';
    width: 8px;
    height: 8px;
    background: white;
    border-radius: var(--radius-full);
}

.option-input:checked + .option-label .option-indicator.checkbox::after {
    width: 10px;
    height: 6px;
    background: transparent;
    border-left: 2px solid white;
    border-bottom: 2px solid white;
    border-radius: 0;
    transform: rotate(-45deg);
    margin-bottom: 2px;
}

/* Visual Feedback Colors */
/* High specificity/important to override default checked states */
.option-label.correct,
.option-input:checked + .option-label.correct {
    border-color: var(--color-success-500) !important;
    background-color: var(--color-success-50) !important;
}

.option-label.incorrect,
.option-input:checked + .option-label.incorrect {
    border-color: var(--color-error-500) !important;
    background-color: var(--color-error-50) !important;
}

/* For dropdowns (was incorrectly named fib-select) */
.blank-dropdown.correct {
    border-color: var(--color-success-500) !important;
    background-color: var(--color-success-50) !important;
}

.blank-dropdown.incorrect {
    border-color: var(--color-error-500) !important;
    background-color: var(--color-error-50) !important;
}

/* For drop zones */
.drop-zone.filled.correct {
    border-color: var(--color-success-500) !important;
    background-color: var(--color-success-50) !important;
}

.drop-zone.filled.incorrect {
    border-color: var(--color-error-500) !important;
    background-color: var(--color-error-50) !important;
}

/* Info Icon & Hint System */
.question-info-wrapper {
    display: inline-flex;
    position: absolute;
    top: var(--spacing-5);
    right: var(--spacing-5);
    z-index: 5;
}

.info-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 1px solid var(--color-neutral-400);
    color: var(--color-neutral-500);
    font-size: 12px;
    font-weight: bold;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.info-icon:hover {
    background-color: var(--color-primary-50);
    color: var(--color-primary-600);
    border-color: var(--color-primary-400);
}

.hint-popup {
    position: absolute;
    top: 100%;
    right: -10px;
    left: auto;
    bottom: auto;
    transform: translateY(8px);
    width: 250px;
    background: white;
    padding: var(--spacing-3);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-neutral-200);
    z-index: 10;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    font-size: var(--font-size-sm);
    color: var(--color-neutral-700);
    pointer-events: none;
}

.hint-popup.visible {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.hint-popup::after {
    content: '';
    position: absolute;
    bottom: 100%;
    top: auto;
    right: 14px;
    left: auto;
    transform: none;
    border-width: 6px;
    border-style: solid;
    border-color: transparent transparent white transparent;
}

.option-text {
    flex: 1;
    color: var(--color-neutral-700);
    line-height: var(--line-height-normal);
    font-size: var(--font-size-sm);
}

/* Correct/Incorrect states */
.option-item.correct .option-label {
    background: var(--color-success-50);
    border-color: var(--color-success-500);
}

.option-item.incorrect .option-label {
    background: var(--color-error-50);
    border-color: var(--color-error-500);
}

/* ----------------------------------------
   Fill in Blanks (Dropdown)
   ---------------------------------------- */
.blank-passage {
    background: var(--color-neutral-50);
    padding: var(--spacing-6);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-neutral-200);
    line-height: 2.8;
    color: var(--color-neutral-700);
    font-size: var(--font-size-base);
}

.blank-dropdown {
    display: inline-block;
    min-width: 140px;
    padding: var(--spacing-1) var(--spacing-4);
    margin: 0 var(--spacing-1);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-primary-700);
    background: white;
    border: 2px solid var(--color-primary-300);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    vertical-align: middle;
    box-shadow: var(--shadow-sm);
}

.blank-dropdown:hover {
    border-color: var(--color-primary-400);
}

.blank-dropdown:focus {
    outline: none;
    border-color: var(--color-primary-500);
    box-shadow: 0 0 0 3px var(--color-primary-100);
}

.blank-dropdown.correct {
    background: var(--color-success-50);
    border-color: var(--color-success-500);
    color: var(--color-success-700);
}

.blank-dropdown.incorrect {
    background: var(--color-error-50);
    border-color: var(--color-error-500);
    color: var(--color-error-700);
}

/* ----------------------------------------
   Fill in Blanks (Drag and Drop)
   ---------------------------------------- */
.drag-drop-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
}

.word-bank {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-2);
    padding: var(--spacing-4);
    background: var(--color-neutral-100);
    border-radius: var(--radius-lg);
    min-height: 60px;
    border: 2px dashed var(--color-neutral-300);
}

.word-bank-label {
    width: 100%;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-neutral-500);
    margin-bottom: var(--spacing-1);
}

.draggable-word {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-2) var(--spacing-4);
    background: white;
    border: 2px solid var(--color-neutral-300);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-neutral-700);
    cursor: grab;
    user-select: none;
    transition: all var(--transition-fast);
}

.draggable-word:hover {
    border-color: var(--color-primary-400);
    background: var(--color-primary-50);
}

.draggable-word.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

.draggable-word.placed {
    display: none;
}

.drop-passage {
    background: var(--color-neutral-50);
    padding: var(--spacing-6);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-neutral-200);
    line-height: 2.6;
    color: var(--color-neutral-700);
    font-size: var(--font-size-base);
}

.drop-zone {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 100px;
    min-height: 36px;
    padding: 0 var(--spacing-3);
    margin: 0 var(--spacing-1);
    background: white;
    border: 2px dashed var(--color-neutral-300);
    border-radius: var(--radius-md);
    vertical-align: middle;
    transition: all var(--transition-fast);
}

.drop-zone.drag-over {
    background: var(--color-primary-100);
    border-color: var(--color-primary-400);
    border-style: solid;
}

.drop-zone.filled {
    background: var(--color-primary-50);
    border: 2px solid var(--color-primary-400);
    cursor: pointer;
}

.drop-zone .dropped-word {
    font-weight: var(--font-weight-medium);
    color: var(--color-primary-700);
}

.drop-zone.correct {
    background: var(--color-success-50);
    border-color: var(--color-success-500);
}

.drop-zone.correct .dropped-word {
    color: var(--color-success-700);
}

.drop-zone.incorrect {
    background: var(--color-error-50);
    border-color: var(--color-error-500);
}

.drop-zone.incorrect .dropped-word {
    color: var(--color-error-700);
}

/* ----------------------------------------
   Reorder Paragraph
   ---------------------------------------- */
.reorder-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
    padding: var(--spacing-2);
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.reorder-container.correct {
    border-color: var(--color-success-500);
    background: var(--color-success-50);
}

.reorder-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3);
    background: var(--color-neutral-50);
    border: 2px solid var(--color-neutral-200);
    border-radius: var(--radius-lg);
    cursor: grab;
    user-select: none;
    transition: all var(--transition-fast);
}

.reorder-item:hover {
    border-color: var(--color-neutral-400);
    box-shadow: var(--shadow-md);
}

.reorder-item.dragging {
    opacity: 0.5;
    border-color: var(--color-primary-400);
}

.reorder-item.drag-over {
    border-color: var(--color-primary-500);
    background: var(--color-primary-50);
}

.reorder-item.correct {
    background: var(--color-success-50);
    border-color: var(--color-success-500);
}

.reorder-item.incorrect {
    background: var(--color-error-50);
    border-color: var(--color-error-500);
}

.reorder-handle {
    display: flex;
    flex-direction: column;
    gap: 3px;
    padding: var(--spacing-2);
    color: var(--color-neutral-400);
    cursor: grab;
}

.reorder-handle span {
    display: block;
    width: 16px;
    height: 2px;
    background: currentColor;
    border-radius: 1px;
}

.reorder-controls {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.reorder-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: white;
    border: 1px solid var(--color-neutral-300);
    border-radius: var(--radius-md);
    color: var(--color-neutral-500);
    font-size: 12px;
    cursor: pointer;
    transition: all var(--transition-fast);
    line-height: 1;
}

.reorder-btn:hover {
    background: var(--color-primary-50);
    border-color: var(--color-primary-400);
    color: var(--color-primary-600);
}

.reorder-btn:active {
    background: var(--color-primary-100);
    transform: translateY(1px);
}

.reorder-text {
    flex: 1;
    font-size: var(--font-size-sm);
    line-height: var(--line-height-normal);
    color: var(--color-neutral-700);
}

/* ----------------------------------------
   Feedback Section (Inline)
   ---------------------------------------- */
.feedback-section {
    margin-top: var(--spacing-4);
    padding: var(--spacing-5);
    border-radius: var(--radius-xl);
    border: 2px solid;
    animation: slideDown var(--transition-slow);
}

.feedback-section.success {
    background: linear-gradient(135deg, var(--color-success-50) 0%, var(--color-success-100) 100%);
    border-color: var(--color-success-500);
}

.feedback-section.partial {
    background: linear-gradient(135deg, var(--color-warning-50) 0%, var(--color-warning-100) 100%);
    border-color: var(--color-warning-500);
}

.feedback-section.needs-work {
    background: linear-gradient(135deg, var(--color-error-50) 0%, var(--color-error-100) 100%);
    border-color: var(--color-error-500);
}

.feedback-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-4);
}

.feedback-icon {
    font-size: 1.5rem;
}

.feedback-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-neutral-800);
}

.feedback-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.feedback-item {
    padding: var(--spacing-3);
    background: white;
    border-radius: var(--radius-lg);
    border-left: 4px solid;
}

.feedback-item.correct {
    border-left-color: var(--color-success-500);
}

.feedback-item.incorrect {
    border-left-color: var(--color-error-500);
}

.feedback-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-1);
}

.feedback-status.correct {
    color: var(--color-success-700);
}

.feedback-status.incorrect {
    color: var(--color-error-700);
}

.feedback-explanation {
    font-size: var(--font-size-xs);
    color: var(--color-neutral-600);
    line-height: var(--line-height-relaxed);
}

.feedback-correct-answer {
    font-weight: var(--font-weight-semibold);
    color: var(--color-success-700);
}

.feedback-actions {
    margin-top: var(--spacing-5);
    display: flex;
    justify-content: center;
}

/* ----------------------------------------
   Completion Section
   ---------------------------------------- */
.completion-section {
    margin-top: var(--spacing-8);
    background: white;
    border-radius: var(--radius-2xl);
    padding: var(--spacing-8);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--color-neutral-200);
    text-align: center;
}

.completion-content {
    max-width: 480px;
    margin: 0 auto;
}

.completion-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-4);
    animation: bounce 0.6s ease;
}

@keyframes bounce {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

.completion-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-neutral-900);
    margin-bottom: var(--spacing-2);
}

.completion-description {
    color: var(--color-neutral-600);
    margin-bottom: var(--spacing-6);
}

.final-score-card {
    background: linear-gradient(135deg, var(--color-primary-500), var(--color-primary-700));
    color: white;
    padding: var(--spacing-6);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-6);
}

.final-score-value {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
}

.final-score-label {
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

.skills-breakdown {
    background: var(--color-neutral-50);
    border-radius: var(--radius-xl);
    padding: var(--spacing-5);
    margin-bottom: var(--spacing-6);
    text-align: left;
}

.skills-breakdown-title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-neutral-800);
    margin-bottom: var(--spacing-3);
}

.skill-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-2) 0;
    border-bottom: 1px solid var(--color-neutral-200);
}

.skill-row:last-child {
    border-bottom: none;
}

.skill-name {
    font-size: var(--font-size-sm);
    color: var(--color-neutral-700);
}

.skill-badge {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-full);
}

.skill-badge.mastered {
    background: var(--color-success-100);
    color: var(--color-success-700);
}

.skill-badge.needs-practice {
    background: var(--color-warning-100);
    color: var(--color-warning-600);
}

/* ----------------------------------------
   Footer
   ---------------------------------------- */
.app-footer {
    background: var(--color-neutral-800);
    color: var(--color-neutral-400);
    padding: var(--spacing-6) 0;
    text-align: center;
    font-size: var(--font-size-sm);
}

/* ----------------------------------------
   Media Queries
   ---------------------------------------- */
@media (max-width: 768px) {
    :root {
        --font-size-2xl: 1.25rem;
        --font-size-xl: 1.125rem;
        --container-max-width: 100%;
    }

    .container {
        padding: 0 var(--spacing-3);
    }

    .app-header .container {
        flex-wrap: wrap;
    }

    .logo {
        font-size: var(--font-size-lg);
    }

    .article-section {
        padding: var(--spacing-4);
        border-radius: var(--radius-xl);
    }

    .questions-section {
        padding: var(--spacing-3);
    }

    .question-card {
        padding: var(--spacing-3);
    }

    .score-display {
        padding: var(--spacing-1) var(--spacing-3);
        font-size: var(--font-size-xs);
    }

    .completion-section {
        padding: var(--spacing-5);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-2);
    }

    .main-content {
        padding: var(--spacing-2) 0;
    }

    .article-section {
        padding: var(--spacing-2);
    }

    .paragraph-content {
        font-size: var(--font-size-base);
    }

    .questions-section {
        padding: var(--spacing-3) var(--spacing-2);
        margin-left: calc(-1 * var(--spacing-2));
        margin-right: calc(-1 * var(--spacing-2));
        border-radius: 0;
        border-left: none;
        border-right: none;
    }

    .question-card {
        padding: var(--spacing-3) var(--spacing-2);
    }

    .option-label {
        padding: var(--spacing-2);
        gap: var(--spacing-2);
    }

    .reorder-item {
        padding: var(--spacing-2);
        gap: var(--spacing-2);
    }

    .reorder-text {
        font-size: var(--font-size-xs);
    }

    .blank-passage {
        padding: var(--spacing-3);
        font-size: var(--font-size-sm);
        line-height: 2.2;
    }

    .btn-large {
        width: 100%;
    }

    .header-actions {
        gap: var(--spacing-2);
    }
}

/* ----------------------------------------
   Reduced Motion
   ---------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ----------------------------------------
   High Contrast Mode
   ---------------------------------------- */
@media (prefers-contrast: high) {
    .btn-primary {
        background: var(--color-primary-800);
    }

    .option-label {
        border-width: 3px;
    }

    .question-card {
        border-width: 3px;
    }

    .drop-zone {
        border-width: 3px;
    }
}

/* ----------------------------------------
   Toast Notifications
   ---------------------------------------- */
.toast-container {
    position: fixed;
    bottom: var(--spacing-8);
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    pointer-events: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
    width: 100%;
    align-items: center;
}

.toast {
    background: rgba(30, 30, 30, 0.95);
    color: white;
    padding: var(--spacing-3) var(--spacing-6);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    box-shadow: var(--shadow-xl);
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255,255,255,0.1);
}

.toast.visible {
    opacity: 1;
    transform: translateY(0);
}

.toast-icon {
    font-size: 1.25rem;
}