@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;600;700&display=swap');

:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #f59e0b;
    --success-color: #10b981;
    --error-color: #ef4444;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-radius: 20px;
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.is-learning-quiz-container {
    font-family: 'Outfit', sans-serif;
    max-width: 800px;
    margin: 40px auto;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    color: var(--text-main);
    display: flex;
    flex-direction: column;
    min-height: 450px;
    position: relative;
}

.is-quiz-loading {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 450px;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

.is-quiz-header {
    padding: 25px 35px;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.is-quiz-nav-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}
.is-nav-btn {
    width: 38px;
    height: 38px;
    border-radius: 8px;
    border: 2px solid #cbd5e1;
    background: #ffffff;
    color: #475569;
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}
.is-nav-btn:hover {
    border-color: #6366f1;
    color: #6366f1;
}
.is-nav-btn.answered {
    background: #dcfce7;
    border-color: #22c55e;
    color: #15803d;
}
.is-nav-btn.active {
    background: #6366f1 !important;
    border-color: #4f46e5 !important;
    color: #ffffff !important;
    box-shadow: 0 4px 10px rgba(99, 102, 241, 0.4);
    transform: scale(1.08);
}

.is-quiz-progress-bar {
    height: 12px;
    background: #e2e8f0;
    border-radius: 99px;
    overflow: hidden;
}

.is-quiz-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #6366f1, #a855f7);
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.is-quiz-stats {
    display: flex;
    justify-content: space-between;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--text-muted);
}

#is-quiz-streak {
    color: var(--secondary-color);
}

.is-quiz-body {
    padding: 35px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    animation: fadeIn 0.5s ease;
}

.is-question-text {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 30px;
    line-height: 1.4;
    text-align: center;
}

.is-options-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 15px;
}

@media(min-width: 600px) {
    .is-options-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.is-option-btn {
    background: #f1f5f9;
    border: 3px solid transparent;
    padding: 18px 25px;
    border-radius: 16px;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-main);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
    outline: none;
}

.is-option-btn:hover:not(:disabled) {
    background: #e2e8f0;
    transform: translateY(-2px);
}

.is-option-btn.selected {
    background: #e0e7ff;
    border-color: var(--primary-color);
    color: var(--primary-hover);
}

.is-option-btn.correct {
    background: #ecfdf5;
    border-color: var(--success-color);
    color: #047857;
}

.is-option-btn.wrong {
    background: #fef2f2;
    border-color: var(--error-color);
    color: #b91c1c;
}

/* Fill In The Blanks Input */
.is-fitb-input {
    border: none;
    border-bottom: 3px solid var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
    font-family: inherit;
    font-size: inherit;
    font-weight: 700;
    color: var(--primary-color);
    padding: 5px 15px;
    border-radius: 8px 8px 0 0;
    width: 150px;
    text-align: center;
    outline: none;
    transition: all 0.2s;
}
.is-fitb-input:focus {
    border-bottom-color: var(--secondary-color);
    background: rgba(245, 158, 11, 0.1);
}
.is-fitb-input.correct {
    border-bottom-color: var(--success-color);
    color: var(--success-color);
    background: #ecfdf5;
}
.is-fitb-input.wrong {
    border-bottom-color: var(--error-color);
    color: var(--error-color);
    background: #fef2f2;
}

.is-feedback-box {
    margin-top: 25px;
    padding: 20px;
    border-radius: 16px;
    font-size: 1.15rem;
    font-weight: 600;
    line-height: 1.5;
    animation: slideUp 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    display: none;
}
.is-feedback-box.correct {
    background: #d1fae5;
    color: #065f46;
}
.is-feedback-box.wrong {
    background: #fee2e2;
    color: #991b1b;
}

.is-quiz-footer {
    padding: 25px 35px;
    border-top: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #f8fafc;
}

.is-btn {
    padding: 14px 28px;
    border-radius: 99px;
    font-size: 1.2rem;
    font-weight: 700;
    cursor: pointer;
    border: none;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: inherit;
}

.is-btn-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(99, 102, 241, 0.39);
}

.is-btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.3);
}

.is-btn-primary:disabled {
    background: #cbd5e1;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.is-btn-success {
    background: var(--success-color);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(16, 185, 129, 0.39);
}
.is-btn-success:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.3);
}

.is-btn-secondary {
    background: transparent;
    color: var(--text-muted);
    border: 2px solid #e2e8f0;
}

.is-quiz-result {
    padding: 40px;
    text-align: center;
    animation: fadeIn 0.5s ease;
}

.is-quiz-result h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 30px;
}

.is-quiz-score-board {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 30px;
}

.score-item {
    padding: 20px 40px;
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}
.correct-score { background: #ecfdf5; }
.correct-score .score-label { color: #059669; font-weight: 600; font-size: 1.2rem; }
.correct-score .score-value { color: #047857; font-weight: 700; font-size: 3rem; }

.wrong-score { background: #fef2f2; }
.wrong-score .score-label { color: #dc2626; font-weight: 600; font-size: 1.2rem; }
.wrong-score .score-value { color: #b91c1c; font-weight: 700; font-size: 3rem; }

.res-feedback-container {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 30px;
    line-height: 1.6;
}

/* Keyframes */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes pop { 0% { transform: scale(1); } 50% { transform: scale(1.3); } 100% { transform: scale(1); } }

/* Audio & Passage Container */
.is-media-container {
    margin-bottom: 25px;
}
.is-audio-wrapper {
    background: #f1f5f9;
    padding: 15px 20px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    gap: 15px;
    border: 1px solid #e2e8f0;
    margin-bottom: 20px;
}
.is-audio-wrapper audio {
    width: 100%;
    outline: none;
}
.is-passage-card {
    background: #f8fafc;
    border-left: 4px solid var(--primary-color);
    padding: 20px 25px;
    border-radius: 12px;
    margin-bottom: 25px;
    text-align: left;
    font-size: 1.05rem;
    line-height: 1.6;
    color: var(--text-main);
    max-height: 250px;
    overflow-y: auto;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.02);
}

/* True / False Buttons */
.is-tf-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    max-width: 500px;
    margin: 0 auto;
}
.is-tf-btn {
    padding: 20px;
    border-radius: 16px;
    font-size: 1.4rem;
    font-weight: 700;
    cursor: pointer;
    border: 3px solid transparent;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}
.is-tf-btn-true { background: #ecfdf5; color: #047857; border-color: #a7f3d0; }
.is-tf-btn-true.selected { background: #10b981; color: #fff; border-color: #059669; box-shadow: 0 4px 12px rgba(16,185,129,0.3); }
.is-tf-btn-false { background: #fef2f2; color: #b91c1c; border-color: #fecaca; }
.is-tf-btn-false.selected { background: #ef4444; color: #fff; border-color: #dc2626; box-shadow: 0 4px 12px rgba(239,68,68,0.3); }

/* Multiple Select (Checkboxes) */
.is-multiselect-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.is-multiselect-item {
    display: flex;
    align-items: center;
    gap: 15px;
    background: #f1f5f9;
    padding: 16px 20px;
    border-radius: 14px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.2s;
    font-size: 1.15rem;
    font-weight: 600;
}
.is-multiselect-item:hover { background: #e2e8f0; }
.is-multiselect-item.selected { background: #e0e7ff; border-color: var(--primary-color); color: var(--primary-hover); }
.is-multiselect-checkbox {
    width: 22px;
    height: 22px;
    accent-color: var(--primary-color);
    cursor: pointer;
}

/* Sentence Reorder / Word Scramble */
.is-reorder-target {
    min-height: 70px;
    background: #f8fafc;
    border: 2px dashed #cbd5e1;
    border-radius: 16px;
    padding: 15px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    margin-bottom: 25px;
}
.is-reorder-pool {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}
.is-word-pill {
    background: #ffffff;
    border: 2px solid #cbd5e1;
    padding: 10px 18px;
    border-radius: 99px;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-main);
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.04);
}
.is-word-pill:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}
.is-word-pill.used {
    opacity: 0.35;
    pointer-events: none;
    background: #e2e8f0;
}
.is-reorder-controls {
    margin-top: 15px;
    display: flex;
    gap: 10px;
    justify-content: center;
}

/* Matching Pairs */
.is-matching-grid {
    display: flex;
    flex-direction: column;
    gap: 15px;
}
.is-matching-pair-row {
    display: flex;
    align-items: center;
    gap: 15px;
    background: #f8fafc;
    padding: 15px 20px;
    border-radius: 14px;
    border: 1px solid #e2e8f0;
}
.is-matching-left {
    flex: 1;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-main);
}
.is-matching-arrow {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.2rem;
}
.is-matching-select {
    flex: 1;
    padding: 10px 15px;
    border-radius: 10px;
    border: 2px solid #cbd5e1;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    outline: none;
}
.is-matching-select:focus {
    border-color: var(--primary-color);
}