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

/* Hide bottom navigation when results are open */
.results-open .practice-bottom-nav {
    display: none !important;
    pointer-events: none !important;
    opacity: 0.4 !important;
}

/* Hide the top header inside resultsInterface (first child) */
#resultsInterface > .results-inner > :first-child,
.results-open #resultsInterface > .results-inner > :first-child {
    display: none !important;
    visibility: hidden !important;
    height: 0 !important;
    margin: 0 !important;
    padding: 0 !important;
}

:root {
    /* Primary Colors */
    --primary-dark: #0f172a;
    --primary: #1e40af;
    --primary-light: #2563eb;
    --primary-lighter: #3b82f6;
    
    /* Neutral Colors - Light Mode */
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --bg-light: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --border-color: #e2e8f0;
    
    /* Status Colors */
    --success: #10b981;
    --success-light: #d1fae5;
    --error: #ef4444;
    --error-light: #fee2e2;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    
    /* Spacing - Mobile-first (reduced) */
    --spacing-xs: 6px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Border Radius - Mobile-first */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;
    
    /* Shadows - Lighter for mobile */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 8px 24px rgba(0, 0, 0, 0.12);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Typography - Mobile-first */
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 22px;
    --font-size-2xl: 26px;
    --font-size-3xl: 32px;
    
    --line-height-base: 1.6;
}

/* Dark Mode */
.dark {
    --bg-main: #0f172a;
    --bg-card: #1e293b;
    --bg-light: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-light: #94a3b8;
    --border-color: #334155;
    
    --success-light: #064e3b;
    --error-light: #7f1d1d;
    --warning-light: #78350f;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 8px 24px rgba(0, 0, 0, 0.6);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    background: var(--bg-main);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* Dark Mode Toggle */
.dark-mode-toggle {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    z-index: 999;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.dark-mode-toggle:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-xl);
}

.dark-mode-toggle:active {
    transform: scale(0.95);
}

.dark-mode-toggle svg {
    width: 24px;
    height: 24px;
    stroke-width: 2;
    color: var(--text-primary);
    transition: opacity var(--transition-base), transform var(--transition-base);
}

.dark-mode-toggle .icon-sun {
    position: absolute;
    opacity: 1;
    transform: rotate(0deg);
}

.dark-mode-toggle .icon-moon {
    position: absolute;
    opacity: 0;
    transform: rotate(90deg);
}

.dark .dark-mode-toggle .icon-sun {
    opacity: 0;
    transform: rotate(90deg);
}

.dark .dark-mode-toggle .icon-moon {
    opacity: 1;
    transform: rotate(0deg);
}

@media (max-width: 768px) {
    .dark-mode-toggle {
        width: 48px;
        height: 48px;
        bottom: var(--spacing-md);
        right: var(--spacing-md);
    }
    
    .dark-mode-toggle svg {
        width: 20px;
        height: 20px;
    }
}

/* Page Header */
.page-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

@media (min-width: 768px) {
    .page-header {
        padding: var(--spacing-xl) var(--spacing-md);
        margin-bottom: var(--spacing-lg);
        box-shadow: var(--shadow-md);
    }
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.page-header h1 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
    font-weight: 700;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    line-height: 1.3;
}

@media (min-width: 768px) {
    .page-header h1 {
        font-size: 2.5em;
    }
}

.header-subtitle {
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
    opacity: 0.95;
    font-weight: 400;
    line-height: var(--line-height-base);
}

@media (min-width: 768px) {
    .header-subtitle {
        font-size: 1.15em;
        margin-bottom: var(--spacing-lg);
    }
}

.header-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.stat-item-small {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-md);
    min-width: 100px;
    transition: var(--transition-base);
}

.stat-item-small:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

.stat-num {
    font-size: 2.2em;
    font-weight: 700;
    line-height: 1;
}

.stat-item-small .stat-label {
    font-size: 0.9em;
    opacity: 0.95;
    font-weight: 500;
}

/* Breadcrumbs */
.breadcrumbs {
    background: var(--bg-light);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-color);
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.breadcrumbs-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.breadcrumbs-list {
    display: flex;
    list-style: none;
    gap: var(--spacing-xs);
    align-items: center;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.breadcrumbs-list li:not(:last-child)::after {
    content: '/';
    margin-left: var(--spacing-xs);
    color: var(--text-light);
}

.breadcrumbs-list a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-base);
}

.breadcrumbs-list a:hover {
    color: var(--primary);
}

.breadcrumbs-list li[aria-current="page"] {
    color: var(--text-primary);
    font-weight: 500;
}

/* Homepage */
.homepage {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    padding-bottom: var(--spacing-2xl);
}

/* Quick Start Section */
.quick-start-section {
    background: var(--bg-card);
    padding: var(--spacing-lg) var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-base), background-color var(--transition-base);
}

.start-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr) !important;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    align-items: stretch;
}

@media (min-width: 768px) {
    .start-cards {
        gap: var(--spacing-md);
    }
}

@media (min-width: 1024px) {
    .start-cards {
        grid-template-columns: repeat(3, 260px) !important; /* exactly 3 cards */
        justify-content: center; /* center the row */
        gap: var(--spacing-lg);
    }

    /* Compact card on desktop and equalize frames */
    .start-card {
        padding: var(--spacing-sm) var(--spacing-md);
        gap: var(--spacing-xs);
        min-height: 140px;
        justify-content: center;
    }

    /* Only title and action button */
    .start-icon,
    .start-card > p {
        display: none;
    }

    .start-card h3 {
        font-size: 1.05em;
        margin-bottom: var(--spacing-xs);
    }

    .start-card .btn {
        width: auto;
        align-self: center;
        min-width: 128px;
    }
}

.start-card {
    background: var(--bg-card);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: default;
}

@media (min-width: 768px) {
    .start-card {
        padding: var(--spacing-xl);
        gap: var(--spacing-md);
    }
}

.dark .start-card {
    background: var(--bg-card);
}

.start-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(30, 64, 175, 0.1), transparent);
    transition: left 0.5s;
}

.start-card:hover::before {
    left: 100%;
}

.start-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary);
}

@media (hover: none) {
    .start-card:hover {
        transform: none;
    }
    
    .start-card:active {
        transform: scale(0.98);
    }
}

.start-icon {
    width: 32px;
    height: 32px;
    margin: 0 auto var(--spacing-xs);
    color: var(--primary);
    transition: var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Hide start icons on all viewports */
.start-icon { display: none !important; }

.start-icon svg {
    width: 100%;
    height: 100%;
    stroke-width: 1.5;
}

@media (min-width: 768px) {
    .start-icon {
        width: 64px;
        height: 64px;
        margin-bottom: var(--spacing-md);
    }
}

.start-card:hover .start-icon {
    transform: scale(1.1) rotate(5deg);
}

.start-card h3 {
    font-size: var(--font-size-base);
    margin-bottom: 0;
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.3;
}

@media (min-width: 768px) {
    .start-card h3 {
        font-size: 1.6em;
    }
}

.start-card > p {
    color: var(--text-secondary);
    font-size: var(--font-size-xs);
    line-height: 1.4;
    margin: 0;
}

@media (min-width: 768px) {
    .start-card > p {
        font-size: var(--font-size-sm);
        line-height: var(--line-height-base);
    }
}

.start-card .btn {
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    width: 100%;
}

@media (min-width: 768px) {
    .start-card .btn {
        font-size: var(--font-size-base);
        padding: var(--spacing-md) var(--spacing-lg);
    }
}

/* Section Container */
.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
}

@media (min-width: 1024px) {
    .section-container {
        max-width: none !important;
        width: 100% !important;
        padding-left: 0;
        padding-right: 0;
    }
}

.section-title {
    font-size: var(--font-size-xl);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--primary);
    font-weight: 700;
    letter-spacing: -0.5px;
    position: relative;
    padding-bottom: var(--spacing-sm);
    line-height: 1.3;
}

@media (min-width: 768px) {
    .section-title {
        font-size: 2em;
    }
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: var(--radius-full);
}

/* Features Section */
.features-section {
    background: var(--bg-card);
    padding: var(--spacing-lg) 0;
    margin-bottom: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    align-items: stretch;
    justify-items: stretch;
    grid-auto-rows: 1fr; /* equal row heights */
}

@media (min-width: 768px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.feature-card {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
    position: relative;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
    min-height: auto;
}

.dark .feature-card {
    background: var(--bg-card);
}

@media (min-width: 768px) {
    .feature-card {
        min-height: 200px;
    }
}

.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
    background: linear-gradient(135deg, #ffffff 0%, #eff6ff 100%);
}

.feature-icon {
    width: 40px;
    height: 40px;
    margin: 0 auto var(--spacing-md);
    color: var(--primary);
    transition: var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon svg {
    width: 100%;
    height: 100%;
    stroke-width: 1.5;
}

@media (min-width: 768px) {
    .feature-icon {
        width: 56px;
        height: 56px;
        font-size: 2.8em;
    }
}

.feature-card:hover .feature-icon {
    transform: scale(1.15);
}

.feature-card h3,
.feature-card h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.3;
}

.feature-card h4 {
    font-size: var(--font-size-lg);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: var(--line-height-base);
    font-size: var(--font-size-sm);
    margin: 0;
}

/* Guide Section */
.guide-section {
    background: var(--bg-card);
    padding: var(--spacing-lg) 0;
    margin-bottom: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.guide-steps {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    align-items: stretch;
    justify-items: stretch;
    grid-auto-rows: 1fr; /* equal row heights */
}

@media (min-width: 768px) {
    .guide-steps {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .guide-steps {
        grid-template-columns: repeat(2, 1fr);
    }
}

.guide-step {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
    padding: var(--spacing-lg);
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    transition: var(--transition-base);
    height: 100%;
    border: 1px solid var(--border-color);
}

.dark .guide-step {
    background: var(--bg-light);
}

.guide-step:hover {
    background: #e0e7ff;
    transform: translateX(5px);
}

.step-number {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4em;
    font-weight: 700;
    flex-shrink: 0;
    box-shadow: 0 4px 15px rgba(30, 64, 175, 0.4);
    transition: var(--transition-base);
}

.guide-step:hover .step-number {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(30, 64, 175, 0.5);
}

.step-content h3,
.step-content h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.3;
}

.step-content h4 {
    font-size: var(--font-size-lg);
}

.step-content p {
    color: var(--text-secondary);
    line-height: var(--line-height-base);
    font-size: var(--font-size-sm);
    margin: 0;
}

/* Tips Section */
.tips-section {
    background: var(--bg-card);
    padding: var(--spacing-lg) 0;
    margin-bottom: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    align-items: stretch;
    justify-items: stretch;
    grid-auto-rows: 1fr; /* equal row heights */
}

@media (min-width: 768px) {
    .tips-grid {
        grid-template-columns: repeat(4, 260px) !important; /* one row of 4 cards */
        justify-content: center; /* center the row */
    }

    /* Prevent wrapping in Start cards */
    .start-card h3,
    .start-card .btn {
        white-space: nowrap;
    }
}

@media (min-width: 1024px) {
    .tips-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.tip-card {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: auto;
}

.dark .tip-card {
    background: var(--bg-card);
}

@media (min-width: 768px) {
    .tip-card {
        min-height: 180px;
    }
}

.tip-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.tip-icon {
    width: 36px;
    height: 36px;
    margin: 0 auto var(--spacing-md);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.tip-icon svg {
    width: 100%;
    height: 100%;
    stroke-width: 1.5;
}

@media (min-width: 768px) {
    .tip-icon {
        width: 50px;
        height: 50px;
        font-size: 2.5em;
    }
}

.tip-card h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.3;
}

.tip-card p {
    color: var(--text-secondary);
    line-height: var(--line-height-base);
    font-size: var(--font-size-sm);
    margin: 0;
}

/* FAQ Section */
.faq-section {
    background: var(--bg-card);
    padding: var(--spacing-lg) 0;
    margin-bottom: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    background: transparent;
    border: none;
    text-align: left;
    cursor: pointer;
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    transition: all var(--transition-base);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.faq-question:hover {
    background: var(--bg-light);
    color: var(--primary);
}

.faq-question span {
    flex: 1;
    padding-right: var(--spacing-md);
}

.faq-icon {
    width: 20px;
    height: 20px;
    stroke-width: 2;
    transition: transform var(--transition-base);
    flex-shrink: 0;
    color: var(--text-secondary);
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
    color: var(--primary);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base), padding var(--transition-base);
    padding: 0 var(--spacing-lg);
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 var(--spacing-lg) var(--spacing-lg) var(--spacing-lg);
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: var(--line-height-base);
    font-size: var(--font-size-sm);
    margin: 0;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Icon Animations */
.start-icon,
.feature-icon,
.tip-icon {
    transition: transform var(--transition-base);
}

.start-card:hover .start-icon,
.feature-card:hover .feature-icon,
.tip-card:hover .tip-icon {
    transform: scale(1.1) rotate(5deg);
}

/* Button Hover Animations */
.btn {
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::after {
    width: 300px;
    height: 300px;
}

.btn-primary:hover {
    transform: translateY(-2px);
}

.btn-secondary:hover {
    transform: translateY(-2px);
}

.btn-success:hover {
    transform: translateY(-2px);
}

/* Test Interface */
.test-interface {
    background: var(--bg-main);
    min-height: 100vh;
}

.test-header-bar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    padding: var(--spacing-md) var(--spacing-lg);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
}

.test-header {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.test-content {
    max-width: 1000px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

@media (min-width: 1024px) {
    .test-header {
        flex-direction: row;
        align-items: center;
        gap: var(--spacing-lg);
    }
    
    .test-content {
        padding: var(--spacing-2xl) var(--spacing-xl);
    }
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-light);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.06);
}

@media (min-width: 768px) {
    .progress-bar {
        height: 10px;
        margin-bottom: var(--spacing-md);
    }
}

@media (min-width: 1024px) {
    .progress-bar {
        height: 12px;
    }
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
    transition: width var(--transition-base);
    border-radius: var(--radius-full);
    box-shadow: 0 2px 8px rgba(30, 64, 175, 0.4);
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.test-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.05em;
    font-weight: 600;
    color: var(--text-primary);
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.timer {
    color: var(--error);
    font-size: 1.2em;
    font-weight: 700;
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--error-light);
    border-radius: var(--radius-md);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    box-shadow: var(--shadow-sm);
    white-space: nowrap;
    min-width: fit-content;
}

.timer::before {
    content: '⏱️';
    font-size: 0.9em;
}

@media (min-width: 768px) {
    .timer {
        font-size: 1.3em;
        padding: var(--spacing-sm) var(--spacing-lg);
    }
    
    .test-info {
        font-size: 1.1em;
    }
}

.timer.hidden {
    display: none;
}

.question-container {
    background: var(--bg-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-lg);
    transition: box-shadow var(--transition-base);
}

.question-content {
    display: flex;
    flex-direction: column;
}

@media (min-width: 1024px) {
    .question-container {
        padding: var(--spacing-2xl);
        box-shadow: var(--shadow-lg);
    }
    
    .question-container:hover {
        box-shadow: var(--shadow-xl);
    }
}

.question-image {
    margin-bottom: var(--spacing-md);
    text-align: center;
    background: var(--bg-light);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
}

.question-image img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    display: block;
    margin: 0 auto;
    max-height: 40vh;
    object-fit: contain;
}

@media (min-width: 768px) {
    .question-image {
        margin-bottom: var(--spacing-lg);
        padding: var(--spacing-md);
    }
    
    .question-image img {
        max-height: 50vh;
    }
    
    .question-image img:hover {
        transform: scale(1.02);
        box-shadow: var(--shadow-lg);
    }
}

@media (min-width: 1024px) {
    .question-image img {
        max-height: 60vh;
    }
}

.question-text {
    font-size: 1.3em;
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    font-weight: 600;
    word-wrap: break-word;
    overflow-wrap: break-word;
    hyphens: auto;
}

@media (min-width: 768px) {
    .question-text {
        font-size: 1.4em;
    }
}

@media (min-width: 1024px) {
    .question-text {
        font-size: 1.5em;
        line-height: 1.8;
    }
}

.answers-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    overflow: visible;
}

@media (min-width: 768px) {
    .answers-container {
        overflow: visible;
    }
}

.answer-option {
    background: var(--bg-main);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: all 0.2s ease;
    display: block;
    position: relative;
    overflow: visible;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
    word-wrap: break-word;
    overflow-wrap: break-word;
    margin-bottom: var(--spacing-xs);
}

.answer-option::before {
    display: none;
}

.answer-option:hover,
.answer-option:active {
    background: #f0f9ff;
    border: 2px solid var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(30, 64, 175, 0.15);
}

@media (hover: none) {
    .answer-option:hover {
        transform: none;
    }
    
    .answer-option:active {
        transform: translateX(4px);
        background: #eff6ff;
    }
}

/* ::before pseudo-element removed */

.answer-option.selected {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border: 3px solid var(--primary);
    box-shadow: 0 4px 16px rgba(30, 64, 175, 0.25);
    transform: translateY(-2px);
    font-weight: 600;
}

.answer-option.selected::before {
    display: none;
}

.answer-option.correct {
    background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
    color: white;
    border-color: var(--success);
}

.answer-option.incorrect {
    background: linear-gradient(135deg, var(--error) 0%, #dc2626 100%);
    color: white;
    border-color: var(--error);
}

/* Answer checkbox removed - not needed */

.answer-text {
    font-size: 0.95em;
    line-height: 1.7;
    word-wrap: break-word;
    overflow-wrap: break-word;
    text-align: justify;
    text-justify: inter-word;
    display: block;
    width: 100%;
}

@media (min-width: 768px) {
    .answer-text {
        font-size: 1.05em;
        line-height: 1.75;
    }
}

.navigation-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: space-between;
    flex-wrap: wrap;
}

@media (min-width: 768px) {
    .navigation-buttons {
        gap: var(--spacing-lg);
    }
}

@media (min-width: 1024px) {
    .navigation-buttons {
        gap: var(--spacing-xl);
    }
    
    .navigation-buttons .btn {
        min-width: 150px;
        padding: var(--spacing-md) var(--spacing-xl);
    }
}

/* Buttons */
.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    flex: 1;
    position: relative;
    overflow: hidden;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    user-select: none;
    width: 100%;
    min-height: 48px;
}

@media (min-width: 768px) {
    .btn {
        width: auto;
        border-radius: var(--radius-xl);
    }
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(30, 64, 175, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(30, 64, 175, 0.5);
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
}

.btn-primary:active {
    transform: translateY(-1px);
}

.btn-secondary {
    background: #475569;
    color: white;
    box-shadow: 0 4px 15px rgba(71, 85, 105, 0.2);
}

.btn-secondary:hover {
    background: #334155;
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(71, 85, 105, 0.4);
}

.btn-secondary:active {
    transform: translateY(-1px);
}

.btn-success {
    background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.5);
}

.btn-success:active {
    transform: translateY(-1px);
}

.btn-back {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    flex: none;
    max-width: fit-content;
}

/* Results Interface */
.results-interface {
    padding: var(--spacing-xl) var(--spacing-md);
    text-align: center;
    max-width: 1000px;
    margin: 0 auto;
}

.results-header {
    margin-bottom: var(--spacing-xl);
}

.certificate-card {
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
    text-align: left;
}

.certificate-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) var(--spacing-xl);
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
    color: #fff;
}

.certificate-title {
    font-size: 1.2em;
    font-weight: 700;
}

.certificate-status {
    padding: 6px 12px;
    border-radius: var(--radius-full);
    font-weight: 700;
    letter-spacing: 0.3px;
    background: rgba(255,255,255,0.15);
}

.certificate-status.pass { background: #10b981; color: #fff; }
.certificate-status.fail { background: #ef4444; color: #fff; }

.certificate-body {
    padding: var(--spacing-xl);
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--spacing-lg);
}

.certificate-row {
    display: flex;
    justify-content: space-between;
    background: var(--bg-light);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
}

@media (max-width: 767px) {
    .certificate-header { padding: var(--spacing-md) var(--spacing-lg); }
    .certificate-body {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
        padding: var(--spacing-lg);
    }
}

.results-header h2 {
    font-size: 1.8em;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    font-weight: 700;
}

.score-circle {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    color: white;
    box-shadow: 0 12px 40px rgba(30, 64, 175, 0.4);
    position: relative;
    animation: pulse 2s ease-in-out infinite;
}

@media (max-width: 767px) {
    .results-interface {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .results-header {
        margin-bottom: var(--spacing-lg);
    }
    
    .results-header h2 {
        font-size: 1.6em;
        margin-bottom: var(--spacing-md);
    }
    
    .score-circle {
        width: 140px;
        height: 140px;
        margin-bottom: var(--spacing-md);
    }
}

@media (min-width: 768px) {
    .results-header h2 {
        font-size: 2.2em;
        margin-bottom: var(--spacing-xl);
    }
    
    .score-circle {
        width: 180px;
        height: 180px;
        margin-bottom: var(--spacing-xl);
    }
}

@media (min-width: 1024px) {
    .results-interface {
        padding: var(--spacing-2xl) var(--spacing-xl);
    }
    
    .results-header h2 {
        font-size: 2.5em;
    }
    
    .score-circle {
        width: 200px;
        height: 200px;
    }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.score-number {
    font-size: 2.5em;
    font-weight: 700;
    line-height: 1;
}

.score-label {
    font-size: 1em;
    opacity: 0.95;
    font-weight: 500;
    margin-top: var(--spacing-xs);
}

@media (max-width: 767px) {
    .score-number {
        font-size: 2.2em;
    }
    
    .score-label {
        font-size: 0.95em;
    }
}

@media (min-width: 768px) {
    .score-number {
        font-size: 3.2em;
    }
    
    .score-label {
        font-size: 1.1em;
    }
}

@media (min-width: 1024px) {
    .score-number {
        font-size: 3.5em;
    }
}

.results-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.history-section {
    max-width: 1000px;
    margin: 0 auto var(--spacing-xl);
    text-align: left;
}

.history-headerbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.history-title {
    font-size: 1.2em;
    font-weight: 700;
    color: var(--text-primary);
}

.history-list {
    width: 100%;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.history-header, .history-row {
    display: grid;
    grid-template-columns: 1.2fr 1.8fr 1fr 1.4fr 1fr;
    gap: 0;
}

.history-header {
    background: var(--bg-light);
    font-weight: 600;
}

.history-cell {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95em;
}

.history-row:hover {
    background: rgba(0,0,0,0.02);
}

.history-cell.status.pass { color: #10b981; font-weight: 700; }
.history-cell.status.fail { color: #ef4444; font-weight: 700; }

@media (max-width: 767px) {
    .history-header, .history-row {
        grid-template-columns: 1fr 1fr;
    }
    .history-cell.id { display: none; }
    .history-cell.detail { display: none; }
    .history-cell { padding: var(--spacing-sm) var(--spacing-md); font-size: 0.9em; }
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.stat-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

@media (max-width: 767px) {
    .results-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-sm);
        margin-bottom: var(--spacing-lg);
        padding: 0;
        width: 100%;
    }
    
    .stat-item {
        padding: var(--spacing-md);
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-sm);
    }
}

@media (min-width: 768px) {
    .results-stats {
        gap: var(--spacing-lg);
    }
    
    .stat-item {
        padding: var(--spacing-lg);
    }
}

@media (min-width: 1024px) {
    .results-stats {
        gap: var(--spacing-xl);
        max-width: 900px;
    }
    
    .stat-item {
        padding: var(--spacing-xl);
    }
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.95em;
    font-weight: 500;
}

.stat-value {
    font-size: 1.8em;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

@media (max-width: 767px) {
    .stat-label {
        font-size: 0.9em;
        margin-bottom: var(--spacing-xs);
    }
    
    .stat-value {
        font-size: 2em;
    }
}

@media (min-width: 768px) {
    .stat-value {
        font-size: 2em;
    }
}

@media (min-width: 1024px) {
    .stat-value {
        font-size: 2.2em;
    }
}

.stat-value.correct {
    color: var(--success);
}

.stat-value.incorrect {
    color: var(--error);
}

.results-actions {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.results-actions .btn {
    width: 100%;
    margin: 0;
}

.results-actions .btn-full-width {
    grid-column: 1 / -1;
}

@media (max-width: 767px) {
    .results-actions {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
        margin-bottom: var(--spacing-lg);
        padding: 0;
        width: 100%;
    }
    
    .results-actions .btn {
        padding: var(--spacing-md) var(--spacing-sm);
        font-size: 0.9em;
        min-height: 48px;
        border-radius: var(--radius-lg);
    }
    
    .results-actions .btn-full-width {
        grid-column: 1 / -1;
    }
}

@media (min-width: 768px) {
    .results-actions {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
    
    .results-actions .btn-full-width {
        grid-column: 1 / -1;
    }
}

@media (min-width: 1024px) {
    .results-actions {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
        max-width: 900px;
    }
    
    .results-actions .btn {
        min-width: auto;
        padding: var(--spacing-md) var(--spacing-lg);
    }
    
    .results-actions .btn-full-width {
        grid-column: 1 / -1;
    }
}

.review-container {
    margin-top: var(--spacing-xl);
    text-align: left;
}

/* Congratulations Modal */
.congrats-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    pointer-events: none;
    padding: var(--spacing-md);
}

.congrats-modal.show {
    opacity: 1;
    visibility: visible;
    pointer-events: all;
}

.congrats-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
}

.congrats-content {
    position: relative;
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border-radius: var(--radius-xl);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: var(--spacing-2xl);
    text-align: center;
    max-width: 500px;
    width: 100%;
    transform: scale(0.8) translateY(20px);
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    z-index: 1;
    border: 2px solid var(--primary);
}

.congrats-modal.show .congrats-content {
    transform: scale(1) translateY(0);
}

.congrats-modal.animate .congrats-content {
    animation: congratsBounce 0.6s ease;
}

@keyframes congratsBounce {
    0%, 100% { transform: scale(1) translateY(0); }
    50% { transform: scale(1.05) translateY(-10px); }
}

.congrats-icon {
    width: 120px;
    height: 120px;
    margin: 0 auto var(--spacing-lg);
    color: var(--success);
    animation: iconPulse 2s ease-in-out infinite;
    display: flex;
    align-items: center;
    justify-content: center;
}

.congrats-icon svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 4px 12px rgba(16, 185, 129, 0.4));
}

@keyframes iconPulse {
    0%, 100% { 
        transform: scale(1) rotate(0deg);
    }
    50% { 
        transform: scale(1.1) rotate(5deg);
    }
}

.congrats-modal.animate .congrats-icon {
    animation: iconPulse 2s ease-in-out infinite, iconSpin 0.8s ease;
}

@keyframes iconSpin {
    0% { transform: scale(0) rotate(-180deg); }
    100% { transform: scale(1) rotate(0deg); }
}

.congrats-title {
    font-size: 2.5em;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--primary) 0%, var(--success) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.congrats-subtitle {
    font-size: 1.2em;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.congrats-score {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--success-light) 100%);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.score-display {
    font-size: 4em;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    animation: scoreCountUp 1s ease-out;
}

@keyframes scoreCountUp {
    0% { 
        transform: scale(0) rotate(-180deg);
        opacity: 0;
    }
    100% { 
        transform: scale(1) rotate(0deg);
        opacity: 1;
    }
}

.score-unit {
    font-size: 1.5em;
    color: var(--text-secondary);
    font-weight: 600;
}

.congrats-content .btn {
    margin: var(--spacing-xs);
    min-width: 180px;
}

@media (max-width: 768px) {
    .congrats-content {
        padding: var(--spacing-xl) var(--spacing-lg);
        max-width: 90%;
    }
    
    .congrats-icon {
        width: 100px;
        height: 100px;
    }
    
    .congrats-title {
        font-size: 2em;
    }
    
    .congrats-subtitle {
        font-size: 1.1em;
    }
    
    .score-display {
        font-size: 3em;
    }
    
    .congrats-content .btn {
        width: 100%;
        margin: var(--spacing-xs) 0;
    }
}

/* Rating Modal */
.rating-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10002;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    pointer-events: none;
    padding: var(--spacing-md);
}

.rating-modal.show {
    opacity: 1;
    visibility: visible;
    pointer-events: all;
}

.rating-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
}

.rating-content {
    position: relative;
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: var(--spacing-2xl);
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9) translateY(20px);
    transition: transform 0.3s ease;
    z-index: 1;
}

.rating-modal.show .rating-content {
    transform: scale(1) translateY(0);
}

.rating-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 36px;
    height: 36px;
    border: none;
    background: var(--bg-light);
    border-radius: 50%;
    font-size: 1.5em;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-base);
    z-index: 10;
}

.rating-close:hover {
    background: var(--error-light);
    color: var(--error);
    transform: rotate(90deg);
}

.rating-title {
    font-size: 1.8em;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.rating-subtitle {
    font-size: 1em;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.rating-stars {
    margin-bottom: var(--spacing-xl);
}

.rating-label {
    display: block;
    font-size: 1em;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.stars-container {
    display: flex;
    flex-direction: row-reverse;
    justify-content: center;
    gap: var(--spacing-xs);
}

.stars-container input[type="radio"] {
    display: none;
}

.star-label {
    font-size: 2.5em;
    color: #d1d5db;
    cursor: pointer;
    transition: all var(--transition-base);
    user-select: none;
    line-height: 1;
}

.star-label:hover,
.star-label:hover ~ .star-label {
    color: #fbbf24;
    transform: scale(1.1);
}

.stars-container input[type="radio"]:checked ~ .star-label,
.stars-container input[type="radio"]:checked + .star-label {
    color: #f59e0b;
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-size: 0.95em;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.form-label .required {
    color: var(--error);
    margin-left: 2px;
}

.form-input,
.form-textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1em;
    font-family: inherit;
    transition: all var(--transition-base);
    background: var(--bg-main);
    color: var(--text-primary);
    box-sizing: border-box;
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

.rating-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-xl);
}

.rating-actions .btn {
    width: 100%;
}

@media (max-width: 768px) {
    .rating-content {
        padding: var(--spacing-xl) var(--spacing-lg);
        max-width: 95%;
    }
    
    .rating-title {
        font-size: 1.5em;
    }
    
    .rating-subtitle {
        font-size: 0.95em;
    }
    
    .star-label {
        font-size: 2em;
    }
    
    .rating-actions {
        flex-direction: column;
    }
    
    .rating-actions .btn {
        width: 100%;
    }
}

/* Dark Mode Support for Modals */
.dark .congrats-content {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    border-color: var(--primary);
}

.dark .rating-content {
    background: var(--bg-card);
}

.dark .form-input,
.dark .form-textarea {
    background: var(--bg-main);
    border-color: var(--border-color);
    color: var(--text-primary);
}

.dark .rating-close {
    background: var(--bg-light);
    color: var(--text-secondary);
}

.dark .rating-close:hover {
    background: var(--error-light);
    color: var(--error);
}

.review-item {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid var(--primary);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
}

.review-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.review-question {
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    font-size: 1.1em;
}

.review-image {
    margin: var(--spacing-md) 0;
    text-align: center;
}

.review-image img {
    max-width: 100%;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
    height: auto;
    display: block;
    margin: 0 auto;
}

.review-answer {
    padding: var(--spacing-md);
    margin: var(--spacing-sm) 0;
    border-radius: var(--radius-sm);
    background: var(--bg-light);
    font-size: 0.95em;
    line-height: 1.6;
}

.review-answer.user-answer {
    border-left: 3px solid var(--primary);
    background: #eff6ff;
}

.review-answer.correct-answer {
    border-left: 3px solid var(--success);
    background: var(--success-light);
}

.review-answer.incorrect-answer {
    border-left: 3px solid var(--error);
    background: var(--error-light);
}

.review-explanation {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--warning-light);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--warning);
    font-size: 0.95em;
    line-height: 1.7;
}

/* Confirmation Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    pointer-events: none;
    padding: var(--spacing-md);
}

.modal.show {
    opacity: 1;
    visibility: visible;
    pointer-events: all;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    width: 100%;
    max-width: 320px;
    padding: var(--spacing-xl) var(--spacing-lg);
    transform: scale(0.9) translateY(20px);
    transition: transform var(--transition-base);
    border: 1px solid var(--border-color);
    text-align: center;
    z-index: 1;
}

.modal.show .modal-content {
    transform: scale(1) translateY(0);
}

.modal-message {
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--text-primary);
    margin: 0 0 var(--spacing-lg) 0;
    font-weight: 600;
}

.modal-footer {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: var(--spacing-md);
}

.modal-footer .btn {
    min-width: auto;
    width: auto;
    flex: none;
    padding: 10px 20px;
    font-size: 14px;
    min-height: 40px;
}

@media (max-width: 768px) {
    .modal {
        padding: var(--spacing-sm);
    }
    
    .modal-content {
        max-width: 300px;
        padding: var(--spacing-lg);
    }
    
    .modal-message {
        font-size: var(--font-size-sm);
        margin-bottom: var(--spacing-md);
        line-height: 1.5;
    }
    
    .modal-footer {
        flex-direction: row;
        gap: 8px;
        margin-top: var(--spacing-md);
        justify-content: center;
    }
    
    .modal-footer .btn {
        min-width: auto;
        width: auto;
        padding: 8px 16px;
        font-size: 13px;
        min-height: 36px;
    }
}

@media (max-width: 480px) {
    .modal-content {
        max-width: 280px;
        padding: var(--spacing-md);
    }
    
    .modal-message {
        font-size: var(--font-size-sm);
        margin-bottom: var(--spacing-sm);
    }
    
    .modal-footer {
        gap: 6px;
    }
    
    .modal-footer .btn {
        min-width: auto;
        width: auto;
        padding: 8px 14px;
        font-size: 12px;
        min-height: 34px;
    }
}

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

.loading {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-md);
    min-height: 60vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.spinner {
    border: 4px solid var(--bg-light);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-lg);
}

.loading p {
    color: var(--text-secondary);
    font-size: 1.1em;
    font-weight: 500;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive Design */
/* Tablet and below */
@media (max-width: 1024px) {
    .homepage {
        padding: 0 var(--spacing-sm);
    }

    /* Start cards: always 2 columns */
    .start-cards {
        grid-template-columns: repeat(2, 1fr);
    }

    .features-grid,
    .guide-steps,
    .tips-grid {
        grid-template-columns: repeat(2, 1fr) !important;
    }
}

/* Test header bar mobile optimization */
@media (max-width: 768px) {
    .test-header-bar > div:first-child {
        width: 100%;
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: var(--spacing-sm);
    }
    
    .test-header-bar .btn-back {
        flex: 1;
        max-width: 150px;
        font-size: 0.9em;
        padding: 8px 12px;
    }
    
    #questionListBtn {
        flex: 1;
        max-width: 180px;
        font-size: 0.85em !important;
        padding: 8px 12px !important;
        white-space: nowrap;
    }
    
    .test-info {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        width: 100%;
        gap: var(--spacing-sm);
    }
    
    #datasetTypeLabel {
        font-size: 0.8em !important;
        padding: 4px 8px !important;
        white-space: nowrap;
    }
}

@media (max-width: 480px) {
    #questionListBtn {
        font-size: 0.8em !important;
        padding: 6px 10px !important;
    }
    
    .test-header-bar .btn-back {
        font-size: 0.85em;
        padding: 6px 10px;
        max-width: 120px;
    }
    
    #datasetTypeLabel {
        font-size: 0.75em !important;
        padding: 4px 6px !important;
    }
}

/* Mobile and Tablet */
@media (max-width: 768px) {
    html {
        -webkit-text-size-adjust: 100%;
        -ms-text-size-adjust: 100%;
    }

    .page-header {
        padding: var(--spacing-lg) var(--spacing-md);
        margin-bottom: var(--spacing-md);
    }

    .page-header h1 {
        font-size: 1.8em;
        line-height: 1.3;
    }

    .header-subtitle {
        font-size: 0.95em;
        margin-bottom: var(--spacing-md);
        padding: 0 var(--spacing-sm);
    }

    .header-stats {
        gap: var(--spacing-sm);
        padding: 0 var(--spacing-sm);
    }

    .stat-item-small {
        min-width: 80px;
        padding: var(--spacing-sm) var(--spacing-xs);
        flex: 1;
        max-width: 120px;
    }

    .stat-num {
        font-size: 1.6em;
    }

    .stat-item-small .stat-label {
        font-size: 0.85em;
    }

    .section-title {
        font-size: 1.6em;
        margin-bottom: var(--spacing-md);
        padding: 0 var(--spacing-sm);
    }

    .features-grid,
    .guide-steps,
    .tips-grid {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: var(--spacing-md);
        padding: 0 var(--spacing-sm);
        align-items: stretch;
        justify-items: stretch;
        grid-auto-rows: 1fr; /* equal height rows on mobile */
    }

    /* Make card content use full frame on mobile */
    .guide-step {
        display: block;
        position: relative;
        padding: calc(var(--spacing-lg) + 12px) var(--spacing-lg) var(--spacing-lg) var(--spacing-lg);
    }

    .guide-step .step-number {
        position: absolute;
        left: 12px;
        top: 12px;
    }

    .feature-card p,
    .tip-card p,
    .step-content p {
        text-align: justify;
    }

    /* Mobile-friendly text: wrap but clamp lines for consistency */
    .tips-grid .tip-card h4 {
        white-space: normal;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    .tips-grid .tip-card p {
        white-space: normal;
        display: -webkit-box;
        -webkit-line-clamp: 3;
        line-clamp: 3;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    
    /* Start cards: always 2 columns on mobile */
    .start-cards {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 8px !important;
        padding: 0 4px;
    }

    .start-card {
        padding: 12px 8px !important;
        min-height: auto;
        gap: 6px !important;
    }

    .start-icon {
        width: 28px !important;
        height: 28px !important;
        margin-bottom: 4px !important;
    }

    .start-card h3 {
        font-size: 14px !important;
        line-height: 1.2 !important;
        margin-bottom: 2px !important;
    }
    
    .start-card > p {
        font-size: 11px !important;
        line-height: 1.3 !important;
        margin-bottom: 4px !important;
    }
    
    .start-card .btn {
        font-size: 11px !important;
        padding: 8px 6px !important;
        min-height: 36px !important;
    }

    .feature-card {
        padding: var(--spacing-lg);
        min-height: auto;
    }

    .feature-icon {
        font-size: 2.5em;
    }

    .tip-card {
        padding: var(--spacing-lg);
        min-height: 180px; /* make rows equal visually */
        height: 100%;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
    }

    .tip-icon {
        font-size: 2.2em;
    }

    .guide-step {
        padding: var(--spacing-md);
    }

    .step-number {
        width: 40px;
        height: 40px;
        font-size: 1.2em;
    }

    /* Test Interface */
    .test-header-bar {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .test-header {
        padding: 0;
    }

    .test-content {
        padding: var(--spacing-md) var(--spacing-sm);
    }

    .question-container {
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-md);
        height: auto;
        min-height: auto;
        max-height: none;
        display: flex;
        flex-direction: column;
        overflow: visible;
        box-sizing: border-box;
        background: var(--bg-card);
        border-radius: var(--radius-lg);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    }
    
    .question-content {
        display: flex;
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .question-text {
        font-size: 1.05em !important;
        line-height: 1.6 !important;
        margin: 0 !important;
        padding: 0 !important;
        word-wrap: break-word;
        overflow-wrap: break-word;
        color: var(--text-primary);
        font-weight: 600;
    }
    
    .answers-container {
        display: flex;
        flex-direction: column;
        gap: var(--spacing-xs);
        overflow: visible;
    }
    
    .answers-container::-webkit-scrollbar {
        width: 4px;
    }
    
    .answers-container::-webkit-scrollbar-track {
        background: transparent;
    }
    
    .answers-container::-webkit-scrollbar-thumb {
        background: rgba(0, 0, 0, 0.2);
        border-radius: 2px;
    }
    
    .answers-container::-webkit-scrollbar-thumb:hover {
        background: rgba(0, 0, 0, 0.3);
    }
    
    .answer-option {
        overflow: visible !important;
        min-height: auto;
        height: auto;
    }

    .question-image {
        margin: 0;
        padding: var(--spacing-sm);
        flex-shrink: 0;
        max-height: 180px;
        overflow: hidden;
        background: var(--bg-light);
        border-radius: var(--radius-md);
    }

    .question-image img {
        max-width: 100%;
        height: auto;
        border-radius: var(--radius-sm);
        max-height: 180px;
        object-fit: contain;
        display: block;
        margin: 0 auto;
    }

    .answers-container {
        gap: var(--spacing-xs);
    }

    .answer-option {
        padding: var(--spacing-md) var(--spacing-lg);
        min-height: auto;
        border-radius: var(--radius-md);
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
        transition: all 0.2s ease;
        margin-bottom: var(--spacing-xs);
    }
    
    .answer-option:hover {
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        transform: translateY(-1px);
        border: 2px solid var(--primary);
    }
    
    .answer-option.selected {
        background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
        color: white;
        border: 3px solid var(--primary);
        font-weight: 600;
    }

    /* Answer checkbox removed */

    .answer-text {
        font-size: 0.95em;
        line-height: 1.5;
    }

    .navigation-buttons {
        flex-direction: row;
        gap: var(--spacing-sm);
        padding: 0;
        justify-content: space-between;
    }

    .navigation-buttons .btn {
        flex: 1;
        padding: var(--spacing-md) var(--spacing-sm);
        font-size: 0.95em;
        min-height: 48px;
        width: auto;
        min-width: 0;
    }

    .btn-back {
        width: auto;
        margin-bottom: var(--spacing-sm);
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .test-info {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
        font-size: 0.95em;
    }

    .timer {
        font-size: 1.2em;
        padding: var(--spacing-xs) var(--spacing-sm);
        width: 100%;
        text-align: center;
        justify-content: center;
    }

    /* Results Interface - already optimized above */

    .review-container {
        margin-top: var(--spacing-lg);
    }

    .review-item {
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-md);
    }

    .review-question {
        font-size: 1em;
        margin-bottom: var(--spacing-sm);
    }

    .review-image {
        margin: var(--spacing-sm) 0;
    }

    .review-answer {
        padding: var(--spacing-sm);
        font-size: 0.9em;
    }

    .review-explanation {
        padding: var(--spacing-sm);
        font-size: 0.9em;
    }

    /* Section Containers */
    .section-container {
        padding: var(--spacing-md) var(--spacing-sm);
    }

    .quick-start-section,
    .features-section,
    .guide-section,
    .tips-section {
        padding: var(--spacing-lg) 0;
        margin-bottom: var(--spacing-md);
    }

    .homepage {
        padding: 0 var(--spacing-sm);
    }
}

/* Responsive Breakpoints for Multiple Phone Sizes */

/* Very Small Mobile (320px - iPhone SE, small Android) */
@media (max-width: 360px) {
    .page-header {
        padding: var(--spacing-sm) var(--spacing-xs);
    }
    
    .page-header h1 {
        font-size: 1.3em;
    }
    
    .header-subtitle {
        font-size: 0.85em;
    }
    
    .start-cards {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 6px !important;
        padding: 0 2px;
    }
    
    .start-card {
        padding: 10px 6px !important;
        gap: 4px !important;
    }
    
    .start-icon {
        width: 24px !important;
        height: 24px !important;
    }
    
    .start-card h3 {
        font-size: 12px !important;
    }
    
    .start-card > p {
        font-size: 10px !important;
    }
    
    .start-card .btn {
        font-size: 10px !important;
        padding: 6px 4px !important;
        min-height: 32px !important;
    }
    
    .test-header-bar {
        padding: var(--spacing-xs) var(--spacing-xs);
    }
    
    .test-content {
        padding: var(--spacing-sm) var(--spacing-xs);
    }
    
    .question-container {
        padding: var(--spacing-md) var(--spacing-sm);
        height: calc(100vh - 160px);
        min-height: 380px;
        max-height: 580px;
    }
    
    .question-text {
        font-size: 1em;
        line-height: 1.6;
    }
    
    .answer-option {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .answer-text {
        font-size: 0.88em;
        line-height: 1.5;
    }
    
    .timer {
        font-size: 1em;
        padding: 4px var(--spacing-xs);
    }
    
    .results-stats {
        gap: var(--spacing-xs);
    }
    
    .stat-item {
        padding: var(--spacing-sm);
        min-width: 80px;
    }
    
    .modal-content {
        max-width: 260px;
        padding: var(--spacing-sm);
    }
    
    .modal-message {
        font-size: 0.9em;
    }
    
    .modal-footer .btn {
        padding: 6px 12px;
        font-size: 11px;
        min-height: 32px;
    }
}

/* Small Mobile (361px - 374px) */
@media (min-width: 361px) and (max-width: 374px) {
    .start-cards {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 8px !important;
        padding: 0 4px;
    }
    
    .start-card {
        padding: 12px 8px !important;
    }
    
    .start-icon {
        width: 26px !important;
        height: 26px !important;
    }
    
    .start-card h3 {
        font-size: 13px !important;
    }
    
    .start-card > p {
        font-size: 10.5px !important;
    }
    
    .start-card .btn {
        font-size: 10.5px !important;
        padding: 7px 5px !important;
        min-height: 34px !important;
    }
    
    .question-container {
        height: calc(100vh - 170px);
        min-height: 400px;
        max-height: 600px;
    }
    
    .question-text {
        font-size: 1.02em;
    }
    
    .answer-text {
        font-size: 0.9em;
    }
    
    .modal-content {
        max-width: 270px;
    }
}

/* Standard Mobile (375px - iPhone SE, iPhone X) */
@media (min-width: 375px) and (max-width: 389px) {
    .start-cards {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 10px !important;
    }
    
    .start-card {
        padding: 14px 10px !important;
    }
    
    .start-icon {
        width: 28px !important;
        height: 28px !important;
    }
    
    .start-card h3 {
        font-size: 14px !important;
    }
    
    .start-card > p {
        font-size: 11px !important;
    }
    
    .start-card .btn {
        font-size: 11px !important;
        padding: 8px 6px !important;
        min-height: 36px !important;
    }
    
    .question-container {
        height: calc(100vh - 175px);
        min-height: 420px;
        max-height: 620px;
    }
    
    .question-text {
        font-size: 1.05em;
    }
    
    .answer-text {
        font-size: 0.92em;
    }
    
    .modal-content {
        max-width: 280px;
    }
}

/* Large Mobile (390px - iPhone 12/13/14) */
@media (min-width: 390px) and (max-width: 411px) {
    .start-cards {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 12px !important;
    }
    
    .start-card {
        padding: 16px 12px !important;
    }
    
    .start-icon {
        width: 32px !important;
        height: 32px !important;
    }
    
    .start-card h3 {
        font-size: 15px !important;
    }
    
    .start-card > p {
        font-size: 11.5px !important;
    }
    
    .start-card .btn {
        font-size: 11.5px !important;
        padding: 9px 7px !important;
        min-height: 38px !important;
    }
    
    .question-container {
        height: calc(100vh - 180px);
        min-height: 440px;
        max-height: 640px;
    }
    
    .question-text {
        font-size: 1.08em;
    }
    
    .answer-text {
        font-size: 0.94em;
    }
    
    .modal-content {
        max-width: 290px;
    }
}

/* XL Mobile (412px - Pixel, Galaxy S20) */
@media (min-width: 412px) and (max-width: 427px) {
    .start-cards {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 14px !important;
    }
    
    .start-card {
        padding: 18px 14px !important;
    }
    
    .start-icon {
        width: 36px !important;
        height: 36px !important;
    }
    
    .start-card h3 {
        font-size: 16px !important;
    }
    
    .start-card > p {
        font-size: 12px !important;
    }
    
    .start-card .btn {
        font-size: 12px !important;
        padding: 10px 8px !important;
        min-height: 40px !important;
    }
    
    .question-container {
        height: calc(100vh - 185px);
        min-height: 460px;
        max-height: 660px;
    }
    
    .question-text {
        font-size: 1.1em;
    }
    
    .answer-text {
        font-size: 0.96em;
    }
    
    .modal-content {
        max-width: 300px;
    }
}

/* XXL Mobile (428px+ - iPhone Pro Max) */
@media (min-width: 428px) and (max-width: 479px) {
    .start-cards {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 16px !important;
    }
    
    .start-card {
        padding: 20px 16px !important;
    }
    
    .start-icon {
        width: 40px !important;
        height: 40px !important;
    }
    
    .start-card h3 {
        font-size: 17px !important;
    }
    
    .start-card > p {
        font-size: 12.5px !important;
    }
    
    .start-card .btn {
        font-size: 12.5px !important;
        padding: 11px 9px !important;
        min-height: 42px !important;
    }
    
    .question-container {
        height: calc(100vh - 190px);
        min-height: 480px;
        max-height: 680px;
    }
    
    .question-text {
        font-size: 1.12em;
    }
    
    .answer-text {
        font-size: 0.98em;
    }
    
    .modal-content {
        max-width: 320px;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .page-header {
        padding: var(--spacing-md) var(--spacing-sm);
    }

    .page-header h1 {
        font-size: 1.5em;
    }

    .header-subtitle {
        font-size: 0.9em;
    }

    .header-stats {
        gap: var(--spacing-xs);
    }

    .stat-item-small {
        min-width: 70px;
        padding: var(--spacing-xs);
        max-width: 100px;
    }

    .stat-num {
        font-size: 1.4em;
    }

    .stat-item-small .stat-label {
        font-size: 0.75em;
    }

    .section-title {
        font-size: 1.4em;
        margin-bottom: var(--spacing-sm);
    }

    .start-card,
    .feature-card,
    .tip-card {
        padding: var(--spacing-md);
    }

    .start-card h3 {
        font-size: 1.3em;
    }

    .feature-card h4,
    .tip-card h4 {
        font-size: 1.1em;
    }

    .start-icon {
        font-size: 2.2em;
    }

    .feature-icon {
        font-size: 2.2em;
    }

    .tip-icon {
        font-size: 2em;
    }

    .step-number {
        width: 36px;
        height: 36px;
        font-size: 1.1em;
    }

    .step-content h4 {
        font-size: 1em;
    }

    .step-content p {
        font-size: 0.85em;
    }

    .test-header-bar {
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .test-content {
        padding: var(--spacing-sm);
    }

    .question-container {
        padding: var(--spacing-lg) var(--spacing-md);
        height: calc(100vh - 180px);
        min-height: 420px;
        max-height: 620px;
    }

    .question-text {
        font-size: 1.05em;
        line-height: 1.65;
        word-wrap: break-word;
        overflow-wrap: break-word;
        margin-bottom: var(--spacing-md);
    }
    
    .question-image {
        max-height: 160px;
        margin-bottom: var(--spacing-md);
    }
    
    .question-image img {
        max-height: 160px;
    }

    .answer-option {
        padding: var(--spacing-md) var(--spacing-lg);
        min-height: auto;
        margin-bottom: var(--spacing-sm);
        overflow: visible;
    }

    .answer-text {
        font-size: 0.92em;
        line-height: 1.7;
        text-align: justify;
    }

    /* Answer checkbox removed */

    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.95em;
        min-height: 44px;
    }

    .timer {
        font-size: 1em;
        padding: 6px var(--spacing-xs);
        min-width: 80px;
    }
    
    .test-info {
        font-size: 0.9em;
    }
    
    #questionCounter {
        font-size: 0.95em;
    }

    .results-header h2 {
        font-size: 1.8em;
    }

    .score-circle {
        width: 120px;
        height: 120px;
    }

    .score-number {
        font-size: 2em;
    }

    .score-label {
        font-size: 1em;
    }

    .stat-value {
        font-size: 1.8em;
    }

    .review-question {
        font-size: 0.95em;
    }

    .review-answer,
    .review-explanation {
        font-size: 0.85em;
        padding: var(--spacing-xs);
    }
}

/* Very Small Mobile */
@media (max-width: 360px) {
    .page-header h1 {
        font-size: 1.3em;
    }

    .header-subtitle {
        font-size: 0.85em;
    }

    .stat-item-small {
        min-width: 60px;
        padding: var(--spacing-xs);
    }

    .stat-num {
        font-size: 1.2em;
    }

    .stat-item-small .stat-label {
        font-size: 0.7em;
    }

    .section-title {
        font-size: 1.3em;
    }

    .question-text {
        font-size: 1em;
    }

    .answer-text {
        font-size: 0.85em;
    }

    .btn {
        font-size: 0.9em;
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .score-circle {
        width: 100px;
        height: 100px;
    }

    .score-number {
        font-size: 1.8em;
    }
}

/* Landscape Mobile */
@media (max-width: 768px) and (orientation: landscape) {
    .page-header {
        padding: var(--spacing-md);
    }

    .page-header h1 {
        font-size: 1.6em;
    }

    .start-cards {
        grid-template-columns: repeat(2, 1fr);
    }

    .features-grid,
    .guide-steps,
    .tips-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .question-image img {
        max-height: 300px;
        object-fit: contain;
    }
}

/* Desktop full-width overrides */
@media (min-width: 1024px) {
    .homepage,
    .header-content,
    .breadcrumbs-container,
    .test-header,
    .test-content,
    .results-interface {
        max-width: none !important;
        width: 100% !important;
    }

    .certificate-card {
        max-width: none !important;
        width: 100% !important;
    }

    /* Make quick start section full-bleed */
    .homepage {
        padding-left: 0;
        padding-right: 0;
    }

    .quick-start-section {
        border-radius: 0;
        margin-left: 0;
        margin-right: 0;
    }

    /* Compact tip cards on desktop */
    .tip-card {
        padding: var(--spacing-md);
        min-height: 140px;
    }

    .tip-icon {
        width: 40px;
        height: 40px;
    }

    .tip-card h4 {
        font-size: 1.05em;
        margin-bottom: var(--spacing-xs);
    }
}

/* Question List Dropdown */
.question-list-dropdown {
    position: fixed;
    top: 60px;
    right: 12px;
    width: 360px;
    max-width: calc(100vw - 24px);
    max-height: calc(100vh - 80px);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    z-index: 999;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: all var(--transition-base);
    border: 2px solid var(--border-color);
}

.question-list-dropdown.hidden {
    display: none;
}

.question-list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--bg-light);
    border-bottom: 2px solid var(--border-color);
}

.question-list-header h4 {
    margin: 0;
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    font-weight: 700;
}

.question-list-header .close-btn,
.category-dropdown-header .close-btn {
    background: transparent;
    border: none;
    font-size: 28px;
    color: var(--text-secondary);
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all var(--transition-fast);
    padding: 0;
    line-height: 1;
}

.question-list-header .close-btn:hover,
.category-dropdown-header .close-btn:hover {
    background: var(--error-light);
    color: var(--error);
    transform: rotate(90deg);
}

.question-list-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-sm);
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 8px;
    align-content: start;
}

.question-list-item {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-main);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 14px;
    position: relative;
}

.question-list-item:hover {
    background: var(--primary-light);
    color: white;
    border-color: var(--primary);
    transform: scale(1.05);
}

.question-list-item.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(30, 64, 175, 0.3);
}

.question-list-item.answered {
    background: var(--success-light);
    border-color: var(--success);
    color: var(--success);
}

.question-list-item.answered.active {
    background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
    color: white;
}

@media (max-width: 768px) {
    .question-list-dropdown {
        top: 56px;
        right: 8px;
        width: calc(100vw - 16px);
        max-height: calc(100vh - 120px);
    }
    
    .question-list-content {
        grid-template-columns: repeat(8, 1fr);
        gap: 6px;
        padding: var(--spacing-xs);
    }
    
    .question-list-item {
        font-size: 12px;
    }
}

@media (max-width: 480px) {
    .question-list-dropdown {
        top: 52px;
    }
    
    .question-list-content {
        grid-template-columns: repeat(6, 1fr);
    }
}

/* Bookmark Button */
.bookmark-btn {
    background: transparent;
    border: 2px solid var(--border-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 24px;
    color: var(--text-secondary);
    padding: 0;
}

.bookmark-btn:hover {
    background: var(--warning-light);
    border-color: var(--warning);
    transform: scale(1.1);
}

.bookmark-btn.bookmarked {
    background: var(--warning-light);
    border-color: var(--warning);
    color: var(--warning);
}

.bookmark-btn.bookmarked #bookmarkIcon {
    content: '★';
}

@media (max-width: 768px) {
    .bookmark-btn {
        width: 36px;
        height: 36px;
        font-size: 20px;
    }
}

/* ============================================
   NEW RESPONSIVE PRACTICE LAYOUT
   ============================================ */

/* Fixed Navbar */
.practice-navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-md);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
    z-index: 1000;
}

.nav-back-btn,
.nav-menu-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.15);
    border: none;
    color: white;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
}

.nav-back-btn:hover,
.nav-menu-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-1px);
}

.nav-menu-btn#resetBtn {
    background: rgba(239, 68, 68, 0.2);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.nav-menu-btn#resetBtn:hover {
    background: rgba(239, 68, 68, 0.3);
    border-color: rgba(239, 68, 68, 0.5);
}

.nav-icon {
    font-size: 18px;
    font-weight: bold;
}

.nav-title {
    font-size: 18px;
    font-weight: 700;
    margin: 0;
    text-align: center;
    flex: 1;
    padding: 0 var(--spacing-md);
}

.nav-buttons-group {
    display: flex;
    gap: 8px;
}

@media (max-width: 768px) {
    .practice-navbar {
        height: 56px;
        padding: 0 var(--spacing-sm);
    }
    
    .nav-back-btn,
    .nav-menu-btn {
        padding: 6px 10px;
        font-size: 13px;
    }
    
    .nav-buttons-group {
        gap: 4px;
    }
    
    .nav-text {
        display: none;
    }
    
    .nav-icon {
        font-size: 20px;
    }
    
    .nav-title {
        font-size: 15px;
        padding: 0 var(--spacing-xs);
    }
}

@media (max-width: 480px) {
    .practice-navbar {
        height: 52px;
    }
    
    .nav-title {
        font-size: 14px;
    }
}

/* Category Dropdown */
.category-dropdown {
    position: fixed;
    top: 60px;
    right: 12px;
    width: 320px;
    max-width: calc(100vw - 24px);
    max-height: calc(100vh - 80px);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    z-index: 999;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: all var(--transition-base);
    border: 2px solid var(--border-color);
}

.category-dropdown.hidden {
    display: none;
}

.category-dropdown-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--bg-light);
    border-bottom: 2px solid var(--border-color);
}

.category-dropdown-header h3 {
    margin: 0;
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    font-weight: 700;
}

.category-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-sm);
}

.category-item {
    padding: var(--spacing-md);
    background: var(--bg-main);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.category-item:hover {
    background: var(--primary-light);
    color: white;
    border-color: var(--primary);
    transform: translateX(4px);
}

.category-name {
    font-weight: 600;
    font-size: 15px;
}

.category-count {
    background: rgba(0, 0, 0, 0.1);
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 600;
}

.category-item:hover .category-count {
    background: rgba(255, 255, 255, 0.2);
}

@media (max-width: 768px) {
    .category-dropdown {
        top: 56px;
        right: 8px;
        width: calc(100vw - 16px);
    }
}

/* Main Content Area */
.practice-main {
    padding-top: 60px;
    padding-bottom: 70px;
    min-height: 100vh;
    background: var(--bg-main);
}

.practice-container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
}

@media (max-width: 768px) {
    .practice-main {
        padding-top: 56px;
        padding-bottom: 65px;
    }
    
    .practice-container {
        padding: var(--spacing-md) var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .practice-main {
        padding-top: 52px;
        padding-bottom: 60px;
    }
    
    .practice-container {
        padding: var(--spacing-sm) var(--spacing-xs);
    }
}

/* Category Section */
.category-section {
    margin-bottom: var(--spacing-2xl);
    scroll-margin-top: 80px;
}

.section-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.section-header h2 {
    margin: 0;
    font-size: 22px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
}

.section-question-count {
    background: rgba(255, 255, 255, 0.2);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 600;
}

@media (max-width: 768px) {
    .section-header {
        padding: var(--spacing-md);
    }
    
    .section-header h2 {
        font-size: 18px;
        flex-direction: column;
        align-items: flex-start;
    }
    
    .section-question-count {
        font-size: 13px;
        padding: 3px 10px;
    }
}

/* Question Card */
.question-card {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    position: relative;
}

.question-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.question-number {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 4px 12px;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 14px;
    margin-bottom: var(--spacing-sm);
}

.question-text-display {
    font-size: 17px;
    line-height: 1.7;
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.question-image-display {
    margin: var(--spacing-md) 0;
    text-align: center;
}

.question-image-display img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    cursor: zoom-in;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.question-image-display img:hover {
    transform: scale(1.02);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.question-image-display img[data-glightbox] {
    position: relative;
}

.question-image-display img[data-glightbox]::after {
    content: '🔍';
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(0, 0, 0, 0.6);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    opacity: 0;
    transition: opacity 0.2s ease;
    pointer-events: none;
}

.question-image-display img[data-glightbox]:hover::after {
    opacity: 1;
}

/* Mobile optimizations for GLightbox */
@media (max-width: 768px) {
    .question-image-display img {
        cursor: pointer;
    }

    .question-image-display img[data-glightbox]::after {
        opacity: 1;
        font-size: 11px;
        padding: 3px 6px;
    }

    /* Ensure lightbox works well on mobile */
    .glightbox-overlay {
        -webkit-overflow-scrolling: touch;
        overscroll-behavior: contain;
    }

    .glightbox-container {
        max-width: 95vw;
        max-height: 95vh;
    }
}

@media (max-width: 480px) {
    .question-image-display img[data-glightbox]::after {
        top: 8px;
        right: 8px;
        font-size: 10px;
        padding: 2px 4px;
    }
}

/* Inline Navigation Buttons - Desktop Only */
.question-nav-buttons {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.question-nav-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    background: #475569;
    border: none;
    border-radius: var(--radius-md);
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 600;
    color: white;
    cursor: pointer;
    transition: all var(--transition-base);
    min-width: 100px;
    justify-content: center;
}

.question-nav-btn:hover:not(:disabled) {
    background: #334155;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.question-nav-btn.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.question-nav-btn.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
}

.question-nav-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
}

.question-nav-btn .btn-icon {
    font-size: 16px;
    line-height: 1;
}

.question-nav-btn .btn-text {
    font-size: 14px;
    line-height: 1;
}


.question-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.option-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-light);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.option-item:hover {
    background: #eff6ff;
    border-color: var(--primary);
    transform: translateX(4px);
}

.option-radio {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.option-label {
    font-size: 15px;
    line-height: 1.6;
    color: var(--text-primary);
    cursor: pointer;
    flex: 1;
}

/* Answer feedback states */
.option-item.correct {
    background: var(--success-light);
    border-color: var(--success);
}

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

.option-item.correct .option-label::after {
    content: ' ✓';
    color: var(--success);
    font-weight: bold;
    margin-left: 8px;
}

.option-item.incorrect .option-label::after {
    content: ' ✗';
    color: var(--error);
    font-weight: bold;
    margin-left: 8px;
}

/* Desktop question card optimization */
@media (min-width: 768px) {
    .question-card {
        max-width: 800px;
        margin-left: auto;
        margin-right: auto;
        margin-bottom: var(--spacing-lg);
        padding: var(--spacing-xl);
    }
}

@media (max-width: 768px) {
    .question-card {
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-md);
    }
    
    .question-text-display {
        font-size: 15px;
        line-height: 1.6;
    }
    
    .option-item {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .option-label {
        font-size: 14px;
    }
}

/* Question header */
.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

.question-number {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--primary);
}

.question-category {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    background: var(--bg-light);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-full);
}

/* Question text display */
.question-text-display {
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

@media (min-width: 768px) {
    .question-text-display {
        font-size: var(--font-size-lg);
    }
}

/* Question image */
.question-image {
    margin: var(--spacing-md) 0;
    text-align: center;
}

.question-image img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

/* Explanation Panel */
.explanation-panel {
    background: var(--bg-light);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-top: var(--spacing-md);
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    transition: all var(--transition-base);
}

.explanation-panel.show {
    opacity: 1;
    max-height: 300px;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.explanation-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

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

.explanation-title {
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--font-size-base);
}

.explanation-text {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: var(--font-size-sm);
}

/* Question List */
.question-list-content {
    max-height: 400px;
    overflow-y: auto;
}

.question-list-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
}

.question-list-item:hover {
    background: var(--bg-light);
}

.question-list-item.answered {
    background: var(--success-light);
}

.question-list-item.correct {
    background: var(--success-light);
}

.question-list-number {
    font-weight: 600;
    color: var(--text-primary);
    min-width: 30px;
}

.question-list-status {
    font-weight: bold;
    color: var(--success);
}

/* Fixed Bottom Navigation - Mobile Only */
.practice-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: white;
    border-top: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-md);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

/* Hide bottom navigation on desktop */
@media (min-width: 768px) {
    .practice-bottom-nav {
        display: none;
    }
}

.dark .practice-bottom-nav {
    background: var(--bg-card);
}

/* Hide bottom navigation on desktop */
@media (min-width: 768px) {
    .practice-bottom-nav {
        display: none !important;
    }
}

.bottom-nav-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    background: #475569;
    border: none;
    color: white;
    padding: 16px 24px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-weight: 600;
    font-size: 18px;
    min-width: 140px;
    min-height: 60px;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.bottom-nav-btn:hover:not(:disabled) {
    background: #334155;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.bottom-nav-btn.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.bottom-nav-btn.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
}

.bottom-nav-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.progress-indicator {
    font-weight: 600;
    font-size: 16px;
    color: var(--text-primary);
}

.btn-icon {
    font-size: 18px;
    font-weight: bold;
}

/* Desktop Navigation Buttons (Inline) */
.question-nav-buttons {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.question-nav-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: #475569;
    border: none;
    border-radius: var(--radius-md);
    padding: 14px 24px;
    font-size: 16px;
    font-weight: 600;
    color: white;
    cursor: pointer;
    transition: all var(--transition-base);
    min-width: 140px;
    min-height: 56px;
    justify-content: center;
}

.question-nav-btn:hover:not(:disabled) {
    background: #334155;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.question-nav-btn.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.question-nav-btn.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
}

.question-nav-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
}

.question-progress {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 15px;
}

.question-nav-btn .btn-icon {
    font-size: 18px;
    line-height: 1;
}

.question-nav-btn .btn-text {
    font-size: 16px;
    line-height: 1;
}

/* Hide inline navigation on mobile - keep bottom navigation only */
@media (max-width: 768px) {
    .question-nav-buttons {
        display: none;
    }

    .practice-bottom-nav {
        display: flex !important;
        height: 70px;
        padding: 0 var(--spacing-md);
    }
    
    .bottom-nav-btn {
        padding: 16px 20px;
        font-size: 18px;
        min-width: 120px;
        min-height: 60px;
        font-weight: 600;
    }
    
    .progress-indicator {
        font-size: 15px;
    }
}

@media (max-width: 480px) {
    .practice-bottom-nav {
        display: flex !important;
        height: 65px;
    }

    .bottom-nav-btn {
        padding: 14px 16px;
        min-width: 100px;
        min-height: 56px;
        font-size: 16px;
        font-weight: 600;
    }
    
    .progress-indicator {
        font-size: 14px;
    }
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
}

.loading-overlay.hidden {
    display: none;
}

.loading-content {
    text-align: center;
    color: white;
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Practice selection modal layout */
#practiceSelectModal .modal-content {
    max-width: 520px;
    text-align: center;
    padding: var(--spacing-lg) var(--spacing-xl);
    background: linear-gradient(135deg, var(--bg-card) 0%, #f1f5f9 100%);
    border: 2px solid var(--primary);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}

#practiceSelectModal .form-group {
    display: grid !important;
    grid-template-columns: 1fr; /* three rows (one per item) */
    gap: var(--spacing-sm);
    justify-items: stretch;
    align-items: stretch;
}

#practiceSelectModal .form-group .btn {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-sm);
    border-radius: var(--radius-lg);
    border: 2px solid transparent;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.12);
}

#practiceSelectModal .modal-footer {
    justify-content: center;
    gap: var(--spacing-sm);
}

/* Stronger overlay for selection modal for better contrast */
#practiceSelectModal .modal-overlay {
    background: rgba(0, 0, 0, 0.7);
}

/* Hover/active feedback for option buttons */
#practiceSelectModal .form-group .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.18);
    border-color: rgba(255, 255, 255, 0.15);
}

#practiceSelectModal .form-group .btn:active {
    transform: translateY(0);
}

/* Dark mode contrast for selection modal */
.dark #practiceSelectModal .modal-content {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    border-color: var(--primary-light);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
}

.dark #practiceSelectModal .form-group .btn {
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.4);
}

@media (max-width: 768px) {
    #practiceSelectModal .modal-content {
        max-width: 92vw;
        padding: var(--spacing-md) var(--spacing-lg);
    }
    #practiceSelectModal .form-group {
        grid-template-columns: 1fr; /* keep 3 rows on mobile as well */
        gap: var(--spacing-sm);
    }
    
    .keyboard-hints {
        display: none !important;
    }
}

/* Keyboard hints styling */
.keyboard-hints {
    animation: fadeInUp 0.5s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.keyboard-hints span {
    background: rgba(255, 255, 255, 0.5);
    padding: 4px 8px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-weight: 500;
}

/* Smooth transitions for all interactive elements */
.answer-option,
.btn,
.question-list-item {
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Focus styles for accessibility */
.btn:focus,
.answer-option:focus,
.bookmark-btn:focus {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
}

/* Loading animation enhancement */
@keyframes pulse-scale {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.8;
    }
}

.loading {
    animation: pulse-scale 2s ease-in-out infinite;
}