/**
 * Claude Code Tutorial - Quiz System Styles
 * Matching the reference project's Apple-inspired design
 */

/* ============================================ */
/* CSS Variables - Matching Tutorial Design    */
/* ============================================ */
:root {
    /* Colors matching tutorial */
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --background: #ffffff;
    --border: #d2d2d7;
    --code-bg: #f5f5f7;
    --link-blue: #0071e3;

    /* Quiz-specific colors */
    --success-green: #34c759;
    --error-red: #ff3b30;
    --warning-yellow: #ff9500;
    --progress-blue: #007aff;
    --card-hover: #f5f5f7;

    /* Spacing */
    --container-max-width: 820px;
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 20px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    color: var(--text-primary);
    background: var(--background);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.icon {
    display: inline-block;
    width: 20px;
    height: 20px;
    vertical-align: middle;
    stroke: currentColor;
    stroke-width: 1.5;
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.icon-sm {
    width: 16px;
    height: 16px;
}

.icon-md {
    width: 20px;
    height: 20px;
}

.icon-lg {
    width: 24px;
    height: 24px;
}

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

/* ============================================ */
/* Quiz Dashboard Header                        */
/* ============================================ */
.quiz-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.quiz-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: linear-gradient(
        90deg,
        #FF6EC7,
        #7B61FF,
        #4FD1C5,
        #7B61FF,
        #FF6EC7
    );
    background-size: 400% 400%;
    animation: apple-glow-border 8s ease-in-out infinite;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.2s ease;
}

.back-link:hover {
    transform: translateX(-4px);
}

/* ============================================ */
/* Progress Overview Stats                      */
/* ============================================ */
.progress-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--card-hover);
    border-radius: 12px;
    border: 1px solid var(--border);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ============================================ */
/* Section Headers                              */
/* ============================================ */
.section-header {
    grid-column: 1 / -1;
    margin: var(--spacing-xl) 0 var(--spacing-md) 0;
}

.section-header:first-child {
    margin-top: 0;
}

.section-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.section-header p {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* ============================================ */
/* Chapter Grid                                 */
/* ============================================ */
.chapter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

/* ============================================ */
/* Chapter Cards - Base Styles                  */
/* ============================================ */
.chapter-card {
    display: block;
    padding: var(--spacing-lg);
    background: var(--background);
    border: 2px solid var(--border);
    border-radius: 12px;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s ease;
    cursor: pointer;
}

.chapter-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    border-color: #000;
}

.chapter-number {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-xs);
}

.chapter-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.chapter-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.chapter-status {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* ============================================ */
/* Status Badges                                */
/* ============================================ */
.status-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.status-badge.not-started {
    background: var(--code-bg);
    color: var(--text-secondary);
}

.status-badge.completed {
    background: linear-gradient(
        90deg,
        #FF6EC7,
        #7B61FF,
        #4FD1C5,
        #7B61FF,
        #FF6EC7
    );
    background-size: 400% 400%;
    animation: apple-glow-border 8s ease-in-out infinite;
    color: #ffffff;
}

/* ============================================ */
/* Completed Cards - Apple Glow Effect         */
/* ============================================ */
.chapter-card.completed {
    background: #f5f5f7;
    border: 3px solid transparent;
    border-radius: 14px;
    background-origin: border-box;
    background-clip: padding-box, border-box;
    background-image:
        linear-gradient(#f5f5f7, #f5f5f7),
        linear-gradient(
            90deg,
            #FF6EC7,
            #7B61FF,
            #4FD1C5,
            #7B61FF,
            #FF6EC7
        );
    background-size: 100%, 400% 400%;
    position: relative;
    animation: apple-glow-border 8s ease-in-out infinite;
    box-shadow: 0 0 0 rgba(127, 97, 255, 0);
    transition: transform 0.3s ease;
}

.chapter-card.completed:hover {
    transform: translateY(-6px);
    animation: apple-glow-border 8s ease-in-out infinite, apple-glow-shadow 8s ease-in-out infinite;
}

/* ============================================ */
/* Perfect Score Cards                          */
/* ============================================ */
.chapter-card.perfect-score {
    border-color: var(--warning-yellow);
    background: rgba(255, 149, 0, 0.05);
    position: relative;
}

.chapter-card.perfect-score::after {
    content: '🏆';
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    font-size: 1.5rem;
}

/* ============================================ */
/* Bonus Cards - Special Styling               */
/* ============================================ */
.chapter-card.bonus {
    background: #f5f5f7;
    border: 3px solid transparent;
    border-radius: 14px;
    background-origin: border-box;
    background-clip: padding-box, border-box;
    background-image:
        linear-gradient(#f5f5f7, #f5f5f7),
        linear-gradient(
            90deg,
            #FF6EC7,
            #7B61FF,
            #4FD1C5,
            #7B61FF,
            #FF6EC7
        );
    background-size: 100%, 400% 400%;
    position: relative;
    animation: apple-glow-border 8s ease-in-out infinite;
    box-shadow: 0 0 0 rgba(127, 97, 255, 0);
    transition: transform 0.3s ease;
}

.chapter-card.bonus:hover {
    transform: translateY(-6px);
    animation: apple-glow-border 8s ease-in-out infinite, apple-glow-shadow 8s ease-in-out infinite;
}

/* ============================================ */
/* Apple-Inspired Animations                    */
/* ============================================ */
@keyframes apple-glow-border {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

@keyframes apple-glow-shadow {
    0% {
        box-shadow:
            0 0 20px rgba(255, 110, 199, 0.3),
            0 0 40px rgba(255, 110, 199, 0.2),
            0 0 60px rgba(255, 110, 199, 0.1);
    }
    25% {
        box-shadow:
            0 0 25px rgba(123, 97, 255, 0.35),
            0 0 50px rgba(123, 97, 255, 0.25),
            0 0 75px rgba(123, 97, 255, 0.15);
    }
    50% {
        box-shadow:
            0 0 30px rgba(79, 209, 197, 0.4),
            0 0 60px rgba(79, 209, 197, 0.3),
            0 0 90px rgba(79, 209, 197, 0.2);
    }
    75% {
        box-shadow:
            0 0 25px rgba(123, 97, 255, 0.35),
            0 0 50px rgba(123, 97, 255, 0.25),
            0 0 75px rgba(123, 97, 255, 0.15);
    }
    100% {
        box-shadow:
            0 0 20px rgba(255, 110, 199, 0.3),
            0 0 40px rgba(255, 110, 199, 0.2),
            0 0 60px rgba(255, 110, 199, 0.1);
    }
}

/* ============================================ */
/* Footer Styles                                */
/* ============================================ */
.quiz-footer {
    text-align: center;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.quiz-footer p {
    margin: var(--spacing-xs) 0;
}

.btn-clear-progress {
    margin-top: var(--spacing-lg);
    padding: 10px 20px;
    background: var(--background);
    border: 2px solid var(--error-red);
    border-radius: 8px;
    color: var(--error-red);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
}

.btn-clear-progress:hover {
    background: var(--error-red);
    color: var(--background);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 59, 48, 0.3);
}

.btn-clear-progress:active {
    transform: translateY(0);
}

/* ============================================ */
/* Quiz Container                               */
/* ============================================ */
.quiz-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--spacing-md);
    padding-top: calc(60px + 32px); /* header height + spacing */
    min-height: calc(100vh - 200px);
}

/* ============================================ */
/* Quiz Start Screen                            */
/* ============================================ */
.quiz-intro {
    text-align: center;
    max-width: 680px;
    margin: 0 auto;
}

.quiz-intro h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.3;
}

.quiz-info {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
}

.quiz-info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.quiz-info-item .icon {
    width: 24px;
    height: 24px;
    stroke: var(--text-secondary);
}

.quiz-info-item div {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
}

.quiz-info-item strong {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.quiz-info-item span {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.quiz-description {
    text-align: left;
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg);
    background: var(--card-hover);
    border-radius: 12px;
    border: 1px solid var(--border);
}

.quiz-description h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.quiz-description h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: var(--spacing-md) 0 var(--spacing-sm) 0;
}

.quiz-description p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.quiz-description ul {
    list-style: none;
    padding-left: 0;
}

.quiz-description li {
    position: relative;
    padding-left: 24px;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

.quiz-description li::before {
    content: '•';
    position: absolute;
    left: 8px;
    color: var(--text-primary);
    font-weight: 700;
}

.btn-lg {
    padding: 16px 32px;
    font-size: 1.125rem;
    margin-top: var(--spacing-lg);
}

/* ============================================ */
/* Quiz Progress Bar                            */
/* ============================================ */
.quiz-progress {
    margin-bottom: var(--spacing-lg);
}

.quiz-progress-bar {
    width: 100%;
    height: 8px;
    background: var(--code-bg);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.quiz-progress-fill {
    height: 100%;
    background: var(--progress-blue);
    transition: width 0.5s ease;
    border-radius: 4px;
}

.quiz-progress-text {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.difficulty-badge {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.difficulty-easy {
    background: rgba(52, 199, 89, 0.1);
    color: var(--success-green);
}

.difficulty-medium {
    background: rgba(255, 149, 0, 0.1);
    color: var(--warning-yellow);
}

.difficulty-hard {
    background: rgba(255, 59, 48, 0.1);
    color: var(--error-red);
}

/* ============================================ */
/* Question Card                                */
/* ============================================ */
.question-card {
    background: var(--background);
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: var(--spacing-xl);
}

.question-text {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.5;
}

/* ============================================ */
/* Options                                      */
/* ============================================ */
.options-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.option-btn {
    background: var(--background);
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: var(--spacing-md) var(--spacing-lg);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 1rem;
    text-align: left;
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-family: inherit;
}

.option-label {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--code-bg);
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.option-text {
    flex: 1;
    color: var(--text-primary);
}

.option-btn:hover:not(:disabled) {
    background: var(--card-hover);
    border-color: var(--text-primary);
}

.option-btn:hover:not(:disabled) .option-label {
    background: var(--text-primary);
    color: white;
}

.option-btn:focus {
    outline: none;
    border-color: var(--text-primary);
    box-shadow: 0 0 0 3px rgba(29, 29, 31, 0.1);
}

.option-btn.correct {
    background: transparent;
    border-color: var(--text-primary);
    border-width: 2px;
}

.option-btn.correct .option-text {
    color: var(--success-green);
    font-weight: 600;
}

.option-btn.correct .option-label {
    background: var(--success-green);
    color: white;
}

.option-btn.incorrect {
    background: transparent;
    border-color: var(--text-primary);
    border-width: 2px;
}

.option-btn.incorrect .option-text {
    color: var(--error-red);
    font-weight: 600;
}

.option-btn.incorrect .option-label {
    background: var(--error-red);
    color: white;
}

.option-btn:disabled {
    cursor: not-allowed;
}

/* ============================================ */
/* Feedback                                     */
/* ============================================ */
.feedback-container {
    margin-top: var(--spacing-lg);
}

.feedback {
    padding: var(--spacing-lg);
    border-radius: 12px;
    animation: fadeIn 0.3s ease;
}

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

.feedback-correct {
    background: #ffffff;
    border: 2px solid var(--text-primary);
}

.feedback-incorrect {
    background: #ffffff;
    border: 2px solid var(--text-primary);
}

.feedback-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    font-size: 1.125rem;
    font-weight: 600;
}

.feedback-header .icon {
    width: 24px;
    height: 24px;
}

.feedback-correct .feedback-header {
    color: var(--success-green);
}

.feedback-correct .feedback-header .icon {
    stroke: var(--success-green);
}

.feedback-incorrect .feedback-header {
    color: var(--error-red);
}

.feedback-incorrect .feedback-header .icon {
    stroke: var(--error-red);
}

.feedback-explanation {
    font-size: 0.9375rem;
    color: var(--text-primary);
    line-height: 1.6;
}

.feedback-explanation p {
    margin-bottom: var(--spacing-sm);
}

.feedback-explanation strong {
    font-weight: 600;
}

/* ============================================ */
/* Quiz Actions                                 */
/* ============================================ */
.quiz-actions {
    display: flex;
    justify-content: flex-end;
    margin-top: var(--spacing-lg);
}

/* ============================================ */
/* Results Screen                               */
/* ============================================ */
.results-container {
    text-align: center;
    max-width: 680px;
    margin: 0 auto;
}

.results-container h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
}

.results-score {
    margin: var(--spacing-xl) 0;
}

.score-circle {
    position: relative;
    width: 180px;
    height: 180px;
    margin: 0 auto;
}

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

.score-bg {
    fill: none;
    stroke: var(--code-bg);
    stroke-width: 8;
}

.score-progress {
    fill: none;
    stroke: var(--progress-blue);
    stroke-width: 8;
    stroke-linecap: round;
    transition: stroke-dashoffset 1s ease;
}

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

.score-text #score-percentage {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.score-text #score-fraction {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

.performance-message {
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg);
    background: var(--card-hover);
    border-radius: 12px;
    border: 1px solid var(--border);
}

.performance-message p {
    font-size: 1.125rem;
    line-height: 1.6;
    color: var(--text-primary);
    margin: 0;
}

.performance-excellent {
    color: var(--success-green) !important;
    font-weight: 600;
}

.performance-good {
    color: var(--link-blue) !important;
    font-weight: 600;
}

.performance-fair {
    color: var(--warning-yellow) !important;
    font-weight: 600;
}

.performance-needs-work {
    color: var(--error-red) !important;
    font-weight: 600;
}

.results-breakdown {
    margin: var(--spacing-xl) 0;
    text-align: left;
}

.results-breakdown h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-lg);
    background: var(--card-hover);
    border-radius: 12px;
    border: 1px solid var(--border);
}

.stat-item .icon {
    width: 32px;
    height: 32px;
    stroke: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.stat-item div {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-item strong {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-item span {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

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

/* ============================================ */
/* Dashboard Styles (index.html)               */
/* ============================================ */
.quiz-dashboard {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
    padding-top: calc(60px + 32px); /* header height + spacing */
}

.dashboard-container h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.dashboard-intro {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.quiz-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.quiz-card {
    background: var(--background);
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: var(--spacing-lg);
    transition: all 0.3s ease;
}

.quiz-card:not(.coming-soon):hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    border-color: #000;
}

.quiz-card.coming-soon {
    opacity: 0.6;
}

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

.quiz-card-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.quiz-badge {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    background: var(--code-bg);
    color: var(--text-secondary);
}

.quiz-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.quiz-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.quiz-meta {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.progress-summary {
    background: var(--card-hover);
    border-radius: 12px;
    border: 1px solid var(--border);
    padding: var(--spacing-xl);
}

.progress-summary h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.progress-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.stat-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-lg);
    background: var(--background);
    border-radius: 12px;
    border: 1px solid var(--border);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-align: center;
}

/* ============================================ */
/* Results Review List                          */
/* ============================================ */
.results-review {
    margin: var(--spacing-xl) 0;
    text-align: left;
}

.results-review h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.results-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.result-item {
    background: var(--background);
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.result-item.correct {
    border-color: var(--text-primary);
    background: transparent;
}

.result-item.correct .result-icon {
    color: var(--success-green);
}

.result-item.correct .result-icon .icon {
    stroke: var(--success-green);
}

.result-item.incorrect {
    border-color: var(--text-primary);
    background: transparent;
}

.result-item.incorrect .result-icon {
    color: var(--error-red);
}

.result-item.incorrect .result-icon .icon {
    stroke: var(--error-red);
}

.result-header {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.result-icon {
    flex-shrink: 0;
}

.result-icon .icon {
    width: 24px;
    height: 24px;
}

.result-question {
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
    font-size: 1rem;
    line-height: 1.5;
}

.result-answer {
    margin-left: calc(24px + var(--spacing-md));
    font-size: 0.9375rem;
    line-height: 1.6;
}

.result-answer.user-answer {
    color: var(--error-red);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.result-answer.correct-answer {
    color: var(--success-green);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.result-explanation {
    margin-left: calc(24px + var(--spacing-md));
    margin-top: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--code-bg);
    border-radius: 8px;
    font-size: 0.875rem;
    color: var(--text-primary);
    line-height: 1.5;
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.result-explanation .icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    margin-top: 2px;
    stroke: var(--text-secondary);
}

/* ============================================ */
/* Site Footer                                  */
/* ============================================ */
.site-footer {
    text-align: center;
    padding: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ============================================ */
/* Error Message                                */
/* ============================================ */
.error-message {
    text-align: center;
    padding: var(--spacing-xl);
}

.error-message h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.error-message p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* ============================================ */
/* Responsive Design                            */
/* ============================================ */
@media (max-width: 768px) {
    .quiz-container {
        padding: var(--spacing-md);
    }

    .quiz-intro h2,
    .results-container h2 {
        font-size: 1.75rem;
    }

    .quiz-info {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: center;
    }

    .quiz-info-item {
        width: 100%;
        justify-content: center;
    }

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

    .question-text {
        font-size: 1.125rem;
    }

    .stats-grid,
    .progress-stats {
        grid-template-columns: 1fr;
    }

    .quiz-grid {
        grid-template-columns: 1fr;
    }

    .results-actions {
        flex-direction: column;
        width: 100%;
    }

    .results-actions .btn,
    .results-actions a {
        width: 100%;
        text-align: center;
    }

    .score-circle {
        width: 140px;
        height: 140px;
    }

    .score-text #score-percentage {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .quiz-container,
    .quiz-dashboard {
        padding: var(--spacing-sm);
    }

    .quiz-intro h2,
    .results-container h2 {
        font-size: 1.5rem;
    }

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

    .quiz-description {
        padding: var(--spacing-md);
    }

    .stat-item strong,
    .stat-value {
        font-size: 1.5rem;
    }
}

/* ============================================ */
/* Hidden Class                                 */
/* ============================================ */
.hidden {
    display: none !important;
}