/* Synaptic Quiz Core Style Sheet */

/* --- Design Tokens --- */
:root {
    /* Fonts */
    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

    /* Spacing Scale (8pt Grid) */
    --spacing-1: 4px;
    --spacing-2: 8px;
    --spacing-3: 12px;
    --spacing-4: 16px;
    --spacing-5: 20px;
    --spacing-6: 24px;
    --spacing-8: 32px;
    --spacing-10: 40px;
    --spacing-12: 48px;
    --spacing-16: 64px;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-round: 9999px;

    /* Shadow Scale */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Animation Speeds */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Variables */
body.theme-light {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --bg-glass: rgba(255, 255, 255, 0.7);
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --text-inverse: #ffffff;
    
    /* Accent Colors (Medical Slate/Teal System) */
    --primary: #0284c7;         /* Sky Blue */
    --primary-hover: #0369a1;
    --primary-light: #e0f2fe;
    
    --accent: #0d9488;          /* Teal */
    --accent-hover: #0f766e;
    
    --success: #16a34a;         /* Emerald */
    --success-light: #dcfce7;
    --danger: #dc2626;          /* Red */
    --danger-light: #fee2e2;
    --warning: #ca8a04;         /* Amber */
    --warning-light: #fef9c3;
    
    --palette-unanswered: #f1f5f9;
    --palette-answered: #e0f2fe;
    --palette-flagged: #fef9c3;
    --palette-current: #0284c7;
    
    --blur-glass: 12px;
}

/* Dark Theme Variables */
body.theme-dark {
    --bg-primary: #0b0f19;
    --bg-secondary: #131b2e;
    --bg-tertiary: #1e293b;
    --bg-glass: rgba(19, 27, 46, 0.7);
    --border-color: #2e3c54;
    --border-hover: #405575;
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --text-inverse: #0f172a;
    
    --primary: #38bdf8;
    --primary-hover: #7dd3fc;
    --primary-light: rgba(56, 189, 248, 0.15);
    
    --accent: #2dd4bf;
    --accent-hover: #5eead4;
    
    --success: #4ade80;
    --success-light: rgba(74, 222, 128, 0.15);
    --danger: #f87171;
    --danger-light: rgba(248, 113, 113, 0.15);
    --warning: #fbbf24;
    --warning-light: rgba(251, 191, 36, 0.15);
    
    --palette-unanswered: #1e293b;
    --palette-answered: rgba(56, 189, 248, 0.2);
    --palette-flagged: rgba(251, 191, 36, 0.2);
    --palette-current: #38bdf8;
    
    --blur-glass: 12px;
}

/* --- Base Styles --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.6;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color var(--transition-normal), color var(--transition-normal);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--text-primary);
}

button, input, select {
    font-family: inherit;
    font-size: inherit;
}

/* Accessibility: Keyboard Focus Indicator */
*:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
}

/* Utility helpers */
.hidden {
    display: none !important;
}

.text-success { color: var(--success) !important; }
.text-danger { color: var(--danger) !important; }
.text-muted { color: var(--text-muted) !important; }

/* --- Layout --- */

/* App Header */
.app-header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-4) var(--spacing-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
    height: 64px;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

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

.app-title {
    font-size: 1.3rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.app-title .highlight {
    color: var(--primary);
}

.header-separator {
    color: var(--border-color);
    font-weight: 300;
}

.current-title {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 300px;
}

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

/* Timer Widget */
.timer-widget {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-round);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

.btn-icon {
    background: none;
    border: 1px solid var(--border-color);
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    background-color: var(--bg-secondary);
    transition: all var(--transition-fast);
    position: relative;
}

.btn-icon:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
}

.kbd-hint {
    display: none; /* hidden on small screen */
}

/* Main Container */
#app-container {
    flex: 1;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-6);
}

.view-container {
    animation: fadeIn var(--transition-normal) ease-out;
}

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

/* Buttons */
.btn-primary {
    background-color: var(--primary);
    color: var(--text-inverse);
    border: none;
    padding: var(--spacing-3) var(--spacing-6);
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}
.btn-primary:hover {
    background-color: var(--primary-hover);
}
.btn-primary:active {
    transform: scale(0.98);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: var(--spacing-3) var(--spacing-6);
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}
.btn-secondary:hover {
    background-color: var(--border-color);
    color: var(--text-primary);
}

.btn-secondary-outline {
    background: none;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
}
.btn-secondary-outline:hover {
    border-color: var(--border-hover);
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}
.btn-secondary-outline.active {
    background-color: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
}

.btn-success {
    background-color: var(--success);
    color: #ffffff;
    border: none;
    padding: var(--spacing-3) var(--spacing-6);
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}
.btn-success:hover {
    background-color: #15803d;
}

.btn-block {
    width: 100%;
    display: block;
}

/* --- 1. Dashboard / Home View --- */
.dashboard-hero {
    background: linear-gradient(135deg, var(--primary-light) 0%, rgba(13, 148, 136, 0.08) 100%);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-8);
    margin-bottom: var(--spacing-8);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-6);
}

.hero-text h2 {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-2);
    letter-spacing: -0.5px;
}

.hero-text p {
    color: var(--text-secondary);
    max-width: 600px;
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-6);
    margin-bottom: var(--spacing-10);
}

.stat-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-5);
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    box-shadow: var(--shadow-sm);
}

.stat-icon {
    font-size: 2rem;
    background-color: var(--bg-tertiary);
    width: 54px;
    height: 54px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.section-title {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-5);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: var(--spacing-2);
}

/* Exam Grid Selection */
.exams-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-6);
    margin-bottom: var(--spacing-10);
}

.exam-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.exam-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background-color: var(--primary);
    opacity: 0.6;
}

.exam-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.exam-card h4 {
    font-size: 1.15rem;
    line-height: 1.4;
    margin-bottom: var(--spacing-3);
}

.exam-meta {
    display: flex;
    justify-content: space-between;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: var(--spacing-6);
}

.exam-meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-1);
}

.exam-card-actions {
    display: flex;
    gap: var(--spacing-3);
}

/* History view */
.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.history-item {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-4) var(--spacing-5);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-3);
}

/* --- 2. Active Quiz View --- */
.quiz-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--spacing-8);
    align-items: start;
}

/* Sidebar Palette */
.quiz-sidebar {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-5);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 84px;
    max-height: calc(100vh - 110px);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-4);
}

.palette-filters {
    display: flex;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-4);
}

.filter-chip {
    flex: 1;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    padding: var(--spacing-1) 0;
    font-size: 0.8rem;
    border-radius: var(--radius-round);
    cursor: pointer;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.filter-chip:hover {
    background-color: var(--border-color);
}

.filter-chip.active {
    background-color: var(--primary);
    color: var(--text-inverse);
    border-color: var(--primary);
}

.palette-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
    gap: var(--spacing-2);
    overflow-y: auto;
    padding-right: var(--spacing-1);
    max-height: 400px;
}

.palette-item {
    aspect-ratio: 1;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--palette-unanswered);
    color: var(--text-secondary);
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
    position: relative;
}

.palette-item:hover {
    border-color: var(--primary);
    transform: scale(1.05);
}

.palette-item.answered {
    background-color: var(--palette-answered);
    color: var(--primary);
    border-color: var(--primary);
}

.palette-item.flagged {
    background-color: var(--palette-flagged);
    border-color: var(--warning);
}

.palette-item.flagged::after {
    content: '🏳️';
    position: absolute;
    top: -2px;
    right: -2px;
    font-size: 8px;
}

.palette-item.current {
    background-color: var(--palette-current);
    color: var(--text-inverse) !important;
    border-color: var(--palette-current);
    box-shadow: 0 0 0 2px var(--bg-secondary), 0 0 0 4px var(--primary);
}

/* Main Quiz Container */
.quiz-main {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-6) var(--spacing-8) var(--spacing-8) var(--spacing-8);
    display: flex;
    flex-direction: column;
}

.quiz-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-4);
}

.q-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    flex-wrap: wrap;
}

.q-badge {
    background-color: var(--primary-light);
    color: var(--primary);
    font-weight: 700;
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-round);
    font-size: 0.85rem;
}

.q-origin {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
}

.q-actions {
    display: flex;
    gap: var(--spacing-2);
}

.progress-bar-container {
    background-color: var(--bg-tertiary);
    height: 6px;
    border-radius: var(--radius-round);
    width: 100%;
    margin-bottom: var(--spacing-6);
    overflow: hidden;
}

.progress-bar {
    background-color: var(--primary);
    height: 100%;
    transition: width var(--transition-normal);
}

.question-container {
    flex: 1;
    margin-bottom: var(--spacing-8);
}

.question-text {
    font-size: 1.15rem;
    font-weight: 500;
    line-height: 1.6;
    margin-bottom: var(--spacing-6);
    white-space: pre-wrap;
}

/* Question image styling */
.question-image-panel {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: var(--spacing-6);
    max-width: 500px;
    width: 100%;
    cursor: pointer;
    position: relative;
    transition: border-color var(--transition-fast);
}

.question-image-panel:hover {
    border-color: var(--primary);
}

.responsive-img {
    width: 100%;
    height: auto;
    display: block;
    max-height: 320px;
    object-fit: contain;
}

.zoom-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: rgba(0, 0, 0, 0.6);
    color: #ffffff;
    font-size: 0.8rem;
    padding: var(--spacing-1) 0;
    text-align: center;
    font-weight: 600;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.question-image-panel:hover .zoom-overlay {
    opacity: 1;
}

/* Choices/Options */
.options-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.option-item {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-4) var(--spacing-5);
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
}

.option-item:hover {
    border-color: var(--border-hover);
    background-color: var(--bg-secondary);
}

.option-item.selected {
    border-color: var(--primary);
    background-color: var(--primary-light);
}

.option-badge {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-weight: 700;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-round);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.option-item:hover .option-badge {
    border-color: var(--border-hover);
}

.option-item.selected .option-badge {
    background-color: var(--primary);
    color: var(--text-inverse);
    border-color: var(--primary);
}

.option-text {
    font-weight: 500;
    color: var(--text-primary);
}

/* Instant feedback and explain mode styles */
.option-item.correct {
    border-color: var(--success);
    background-color: var(--success-light);
}
.option-item.correct .option-badge {
    background-color: var(--success);
    color: #ffffff;
    border-color: var(--success);
}
.option-item.incorrect {
    border-color: var(--danger);
    background-color: var(--danger-light);
}
.option-item.incorrect .option-badge {
    background-color: var(--danger);
    color: #ffffff;
    border-color: var(--danger);
}

/* Explanation Panel */
.feedback-banner {
    margin-top: var(--spacing-6);
    border-radius: var(--radius-md);
    padding: var(--spacing-4) var(--spacing-5);
    border: 1px solid var(--border-color);
    animation: fadeIn var(--transition-fast) ease-out;
}

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

.feedback-banner.incorrect {
    background-color: var(--danger-light);
    border-color: var(--danger);
}

.feedback-status {
    font-weight: 700;
    font-size: 1.05rem;
    margin-bottom: var(--spacing-2);
}

.feedback-explanation {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* Quiz Footer */
.quiz-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: var(--spacing-5);
    margin-top: var(--spacing-6);
}

/* --- 3. Results / Review View --- */
.results-header {
    text-align: center;
    margin-bottom: var(--spacing-6);
}

.results-header h2 {
    font-size: 2.2rem;
    letter-spacing: -1px;
}

.results-summary-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6) var(--spacing-8);
    display: flex;
    align-items: center;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: var(--spacing-8);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-8);
}

.radial-score-container {
    position: relative;
    width: 140px;
    height: 140px;
}

.radial-progress {
    transform: rotate(-90deg);
    width: 100%;
    height: 100%;
}

.radial-progress circle {
    fill: none;
    stroke-width: 8;
}

.radial-progress circle.bg {
    stroke: var(--bg-tertiary);
}

.radial-progress circle.bar {
    stroke: var(--primary);
    stroke-linecap: round;
    transition: stroke-dashoffset var(--transition-slow);
}

.radial-score-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
}

#score-percentage {
    font-size: 1.8rem;
    font-weight: 800;
}

#score-grade {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
}

.score-details-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(140px, 1fr));
    gap: var(--spacing-4) var(--spacing-8);
}

.detail-item {
    display: flex;
    flex-direction: column;
}

.detail-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.detail-value {
    font-size: 1.3rem;
    font-weight: 700;
}

.review-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-10);
}

/* Question breakdown list */
.question-list-review {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
}

.review-q-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-5);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
}

.review-q-card.correct-q {
    border-left: 4px solid var(--success);
}

.review-q-card.incorrect-q {
    border-left: 4px solid var(--danger);
}

.review-q-header {
    display: flex;
    justify-content: space-between;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: var(--spacing-3);
}

.review-q-text {
    font-weight: 500;
    margin-bottom: var(--spacing-4);
}

.review-q-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-4);
}

.review-opt {
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
}

.review-opt.user-picked {
    border-color: var(--danger);
    background-color: var(--danger-light);
}

.review-opt.correct-picked {
    border-color: var(--success);
    background-color: var(--success-light);
}

.review-explanation-box {
    margin-top: var(--spacing-2);
    border-top: 1px dashed var(--border-color);
    padding-top: var(--spacing-3);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* --- Modals & Overlays --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn var(--transition-fast) ease-out;
}

.modal-content {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    animation: scaleUp var(--transition-fast) ease-out;
}

@keyframes scaleUp {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.modal-header {
    padding: var(--spacing-4) var(--spacing-5);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.btn-close {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--text-muted);
    transition: color var(--transition-fast);
}
.btn-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-5);
}

.config-group {
    margin-bottom: var(--spacing-5);
}

.config-label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-2);
    font-size: 0.95rem;
}

/* Toggle buttons config */
.toggle-group {
    display: flex;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-1);
    gap: var(--spacing-1);
}

.toggle-btn {
    flex: 1;
    background: none;
    border: none;
    padding: var(--spacing-2) 0;
    font-weight: 600;
    cursor: pointer;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.toggle-btn:hover {
    color: var(--text-primary);
}

.toggle-btn.active {
    background-color: var(--bg-secondary);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.timed-options {
    margin-top: var(--spacing-3);
    padding: var(--spacing-3);
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.timed-options input {
    width: 80px;
    padding: var(--spacing-2);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    text-align: center;
}

/* Checkbox design */
.checkbox-container {
    display: flex;
    align-items: center;
    position: relative;
    padding-left: var(--spacing-6);
    cursor: pointer;
    font-size: 0.95rem;
    user-select: none;
}
.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}
.checkmark {
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    height: 18px;
    width: 18px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
}
.checkbox-container:hover input ~ .checkmark {
    border-color: var(--border-hover);
}
.checkbox-container input:checked ~ .checkmark {
    background-color: var(--primary);
    border-color: var(--primary);
}
.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}
.checkbox-container input:checked ~ .checkmark:after {
    display: block;
}
.checkbox-container .checkmark:after {
    left: 6px;
    top: 2px;
    width: 4px;
    height: 8px;
    border: solid #ffffff;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.modal-footer {
    padding: var(--spacing-4) var(--spacing-5);
    border-top: 1px solid var(--border-color);
}

/* --- Search Modal (Ctrl+K) --- */
.search-modal-content {
    max-width: 680px;
}

.search-header {
    display: flex;
    align-items: center;
    padding: var(--spacing-4) var(--spacing-5);
    border-bottom: 1px solid var(--border-color);
    gap: var(--spacing-3);
}

.search-header input {
    flex: 1;
    border: none;
    background: none;
    outline: none;
    font-size: 1.15rem;
    color: var(--text-primary);
}

.search-icon {
    font-size: 1.3rem;
}

.search-filters {
    display: flex;
    padding: var(--spacing-3) var(--spacing-5);
    background-color: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    gap: var(--spacing-6);
}

.search-results {
    max-height: 400px;
    overflow-y: auto;
    padding: var(--spacing-3) var(--spacing-5);
}

.search-empty-state {
    text-align: center;
    padding: var(--spacing-8) 0;
    color: var(--text-muted);
}

.search-result-item {
    padding: var(--spacing-3) var(--spacing-4);
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition-fast);
    border-radius: var(--radius-sm);
}

.search-result-item:hover {
    background-color: var(--bg-tertiary);
}

.search-result-title {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: var(--spacing-1);
    color: var(--primary);
}

.search-result-context {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* --- Lightbox --- */
.lightbox-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(15, 23, 42, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    animation: fadeIn var(--transition-fast) ease-out;
}

.lightbox-content {
    max-width: 90%;
    max-height: 80%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-4);
}

.lightbox-content img {
    max-width: 100%;
    max-height: 70vh;
    border-radius: var(--radius-md);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    background-color: #ffffff;
    object-fit: contain;
}

.lightbox-caption {
    color: #ffffff;
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
}

.lightbox-close {
    position: absolute;
    top: 24px;
    right: 24px;
    background: none;
    border: none;
    color: #ffffff;
    font-size: 2rem;
    cursor: pointer;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-fast);
}

.lightbox-close:hover {
    transform: scale(1.1);
}

/* --- Responsive Adjustments --- */
@media (max-width: 960px) {
    .quiz-layout {
        grid-template-columns: 1fr;
    }
    
    .quiz-sidebar {
        position: fixed;
        top: 0;
        right: -320px;
        bottom: 0;
        width: 300px;
        z-index: 500;
        transition: right var(--transition-normal);
        max-height: 100vh;
        border-radius: var(--radius-lg) 0 0 var(--radius-lg);
    }
    
    .quiz-sidebar.open {
        right: 0;
    }
    
    .mobile-only {
        display: flex !important;
    }
}

@media (max-width: 640px) {
    #app-container {
        padding: var(--spacing-4);
    }
    
    .app-header {
        padding: var(--spacing-2) var(--spacing-4);
    }
    
    .dashboard-hero {
        padding: var(--spacing-5);
    }
    
    .hero-text h2 {
        font-size: 1.4rem;
    }
    
    .app-title {
        font-size: 1.1rem;
    }
    
    .current-title {
        max-width: 140px;
    }
    
    .score-details-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-3);
    }
    
    .results-summary-card {
        padding: var(--spacing-5);
    }
}