:root {
    --xp-gold: #ffb703;
    --neon-purple: #7209b7;
    --glass-bg: rgba(255, 255, 255, 0.95);
    --primary-color: #007bff;
    --primary-dark: #0056b3;
    --accent-ai: #8a2be2;
    --neon-green: #2ecc71;
    --dark-blue: #1e3c72;
    --text-dark: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
}

body {
    font-family: 'Lato', sans-serif;
    background-color: #f8fafc;
    color: var(--text-dark);
}

.premium-glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border: 1px solid rgba(255, 255, 255, 0.8);
    border-radius: 18px;
    box-shadow: 0 10px 30px rgba(31, 38, 135, 0.04);
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.quizzes-hero-banner {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: #ffffff;
    padding: calc(var(--header-height, 80px) + 40px) 24px 60px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.quizzes-hero-banner h1 {
    font-family: 'Poppins', sans-serif;
    font-size: clamp(2.2rem, 5vw, 3.8rem);
    font-weight: 800;
    margin-bottom: 15px;
    letter-spacing: -1px;
    background: linear-gradient(to right, #ffffff, #93c5fd);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.quizzes-hero-banner p {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    max-width: 700px;
    margin: 0 auto;
    color: #cbd5e1;
    line-height: 1.6;
}

.grand-prix-event-wrapper {
    max-width: 750px;
    margin: -40px auto 40px;
    padding: 25px;
    position: relative;
    z-index: 10;
}

.grand-prix-event-wrapper h3 {
    font-family: 'Poppins', sans-serif;
    color: var(--text-dark);
    font-weight: 700;
    font-size: 1.25rem;
    margin: 0 0 15px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.grand-prix-countdown-container {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.time-node-box {
    background: #1e293b;
    color: #ffffff;
    border-radius: 12px;
    padding: 12px 15px;
    min-width: 75px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
}

.time-node-box span {
    display: block;
    font-size: 1.8rem;
    font-family: 'Poppins', sans-serif;
    font-weight: 800;
    color: var(--xp-gold);
    line-height: 1.1;
}

.time-node-box label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #94a3b8;
    font-weight: 600;
}

.quiz-center-container {
    max-width: 1250px;
    margin: 0 auto 80px;
    padding: 0 24px;
    box-sizing: border-box;
}

.quiz-dashboard-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 35px;
    align-items: start;
}

.quiz-sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 24px;
}

.quiz-sidebar-nav h4 {
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--text-dark);
    margin: 0 0 15px 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

.subject-selection-btn {
    width: 100%;
    padding: 14px 18px;
    border-radius: 12px;
    border: 1px solid transparent;
    background-color: #ffffff;
    color: var(--text-dark);
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    font-size: 0.95rem;
    text-align: left;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.25s;
    box-shadow: 0 2px 5px rgba(0,0,0,0.02);
}

.subject-selection-btn i.sub-icon {
    font-size: 1.15rem;
    width: 25px;
    color: var(--text-muted);
    transition: color 0.2s;
}

.subject-selection-btn:hover {
    transform: translateX(4px);
    background-color: #f1f5f9;
    border-color: var(--primary-color);
}

.subject-selection-btn.active-subject {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: #ffffff;
    box-shadow: 0 8px 20px rgba(0, 123, 255, 0.25);
}
.subject-selection-btn.active-subject i.sub-icon { color: #ffffff; }

.quiz-main-stage {
    padding: 35px;
    min-height: 500px;
}

.topic-selector-header {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
}

.topic-pill-btn {
    padding: 8px 18px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    background-color: #ffffff;
    color: #475569;
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.topic-pill-btn:hover {
    background-color: #f8fafc;
    border-color: var(--neon-purple);
}

.topic-pill-btn.active-topic {
    background-color: var(--neon-purple);
    color: #ffffff;
    border-color: var(--neon-purple);
    box-shadow: 0 4px 12px rgba(114, 9, 183, 0.25);
}

.active-quiz-engine { animation: fadeInLayout 0.4s ease forwards; }

.quiz-card-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    flex-wrap: wrap;
    gap: 15px;
}

.quiz-card-head h2 {
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
    font-size: 1.35rem;
    color: var(--text-dark);
    margin: 0;
}

.live-xp-tracker-badge {
    background: linear-gradient(45deg, #ff9f00, var(--xp-gold));
    color: #ffffff;
    padding: 6px 14px;
    border-radius: 30px;
    font-weight: 700;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 6px;
    box-shadow: 0 4px 10px rgba(255, 183, 3, 0.3);
}

.quiz-progress-bar-rail {
    width: 100%;
    height: 8px;
    background-color: #e2e8f0;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 30px;
}

.quiz-progress-bar-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary-color), var(--neon-purple));
    border-radius: 4px;
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.quiz-question-box-text {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-dark);
    line-height: 1.6;
    margin-bottom: 25px;
}

.quiz-question-box-text .MathJax { font-size: 1.1em !important; }

.quiz-interactive-options-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 30px;
}

.quiz-answer-option-row {
    width: 100%;
    padding: 16px 20px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background-color: #ffffff;
    text-align: left;
    font-size: 1rem;
    font-family: 'Lato', sans-serif;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.2s ease;
    gap: 15px;
}

.quiz-answer-option-row span {
    flex: 1;
    word-break: break-word;
    line-height: 1.5;
}

.quiz-answer-option-row:hover {
    background-color: #f8fafc;
    border-color: var(--primary-color);
}

.quiz-answer-option-row.selected-node {
    border-color: var(--primary-color) !important;
    background-color: #e0f2fe !important;
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.15);
}

.quiz-answer-option-row.correct-node {
    background-color: #ecfdf5 !important;
    border-color: var(--neon-green) !important;
    color: #065f46 !important;
    font-weight: 700;
}

.quiz-answer-option-row.wrong-node {
    background-color: #fef2f2 !important;
    border-color: #ef4444 !important;
    color: #991b1b !important;
}

.quiz-engine-footer-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.quiz-current-index-lbl {
    font-size: 0.95rem;
    color: var(--text-muted);
    font-weight: 600;
}

.quiz-action-next-btn {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: #ffffff;
    border: none;
    padding: 12px 28px;
    border-radius: 10px;
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.2);
    transition: all 0.2s;
}

.quiz-action-next-btn:disabled {
    background: #cbd5e1;
    color: #94a3b8;
    cursor: not-allowed;
    box-shadow: none;
}

.review-headline-title {
    font-family: 'Poppins', sans-serif;
    font-size: 1.3rem;
    color: var(--text-dark);
    margin: 40px 0 20px;
    text-align: left;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 8px;
}

.review-question-card {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    text-align: left;
    box-shadow: 0 2px 6px rgba(0,0,0,0.02);
}

.ai-explanation-box {
    background-color: #f8fafc;
    border-left: 4px solid var(--accent-ai);
    padding: 15px;
    margin-top: 15px;
    border-radius: 0 8px 8px 0;
    font-size: 0.95rem;
    line-height: 1.5;
    color: #334155;
}

.quiz-completion-card-summary {
    text-align: center;
    padding: 40px 10px;
    animation: fadeInLayout 0.5s ease forwards;
}

.quiz-completion-card-summary i.trophy-icon {
    font-size: 4.5rem;
    color: var(--xp-gold);
    margin-bottom: 20px;
}

.score-metrics-row-display {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 35px;
}

.metric-block-node {
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    padding: 15px 25px;
    border-radius: 12px;
    min-width: 110px;
}

.metric-block-node span {
    display: block;
    font-size: 1.6rem;
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
}

.metric-block-node label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    font-weight: 700;
}

.quiz-reset-btn {
    background-color: #1e293b;
    color: #ffffff;
    border: none;
    padding: 14px 35px;
    border-radius: 10px;
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.2s;
}
.quiz-reset-btn:hover { background-color: #0f172a; }

@media (max-width: 992px) {
    .quiz-dashboard-layout {
        grid-template-columns: 1fr;
        gap: 25px;
    }
    .quiz-sidebar-nav {
        flex-direction: row;
        overflow-x: auto;
        padding: 15px;
        white-space: nowrap;
        gap: 12px;
        border-bottom: 1px solid var(--border-color);
    }
    .quiz-sidebar-nav h4 { display: none; }
    .subject-selection-btn {
        width: auto;
        display: inline-flex;
        padding: 10px 18px;
        font-size: 0.95rem;
        gap: 10px;
    }
    .subject-selection-btn i.fa-chevron-right { display: none; }
}

@media (max-width: 768px) {
    .quizzes-hero-banner { padding: calc(var(--header-height, 60px) + 20px) 16px 40px; }
    .grand-prix-event-wrapper { margin: -20px 16px 30px; padding: 20px 15px; }
    .grand-prix-countdown-container { gap: 10px; }
    .time-node-box { min-width: 60px; padding: 10px; }
    .time-node-box span { font-size: 1.4rem; }
    
    .quiz-main-stage { padding: 20px 15px; }
    .quiz-card-head { flex-direction: column; align-items: flex-start; gap: 10px; }
    .quiz-card-head h2 { font-size: 1.25rem; }
    .quiz-question-box-text { font-size: 1.05rem; }
    .quiz-answer-option-row { padding: 14px 16px; font-size: 0.95rem; }
    
    .quiz-engine-footer-controls { flex-direction: column; align-items: stretch; gap: 15px; }
    .quiz-action-next-btn { justify-content: center; }

    .score-metrics-row-display { gap: 15px; }
    .metric-block-node { padding: 15px; min-width: 90px; }
}

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