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

body {
    font-family: 'Amazon Ember', Arial, sans-serif;
    background: linear-gradient(135deg, #232F3E 0%, #FF9900 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin-bottom: 30px;
    text-align: center;
}

h1 {
    color: #232F3E;
    font-size: 2.5em;
    margin-bottom: 10px;
}

.subtitle {
    color: #FF9900;
    font-size: 1.2em;
    margin-bottom: 20px;
}

.exam-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-top: 20px;
}

.info-card {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    border-left: 4px solid #FF9900;
}

.info-card strong {
    display: block;
    color: #232F3E;
    margin-bottom: 5px;
}

.controls {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.control-group {
    margin-bottom: 20px;
}

.control-group label {
    display: block;
    color: #232F3E;
    font-weight: bold;
    margin-bottom: 10px;
}

select, button {
    width: 100%;
    padding: 12px;
    border-radius: 5px;
    border: 2px solid #ddd;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s;
}

select {
    background: white;
}

select:focus {
    outline: none;
    border-color: #FF9900;
}

button {
    background: #FF9900;
    color: white;
    border: none;
    font-weight: bold;
    margin-top: 10px;
}

button:hover {
    background: #ec7211;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.stat-card {
    background: white;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    min-height: 100px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.stat-number {
    font-size: 2em;
    color: #FF9900;
    font-weight: bold;
    display: block;
    line-height: 1.2;
}

.stat-label {
    color: #666;
    font-size: 0.9em;
    margin-top: 5px;
    display: block;
}

.flashcard-container {
    perspective: 1000px;
    margin-bottom: 30px;
}

.flashcard {
    background: white;
    border-radius: 15px;
    padding: 40px;
    min-height: 450px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    cursor: pointer;
    transition: transform 0.6s;
    transform-style: preserve-3d;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: visible;
}

.flashcard.quiz-mode {
    cursor: default;
    min-height: auto;
    padding: 30px;
    overflow: visible;
}

.flashcard.flipped {
    transform: rotateY(180deg);
}

.flashcard-content {
    backface-visibility: hidden;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    position: relative;
}

.flashcard-content.quiz-content {
    position: relative;
    padding: 0;
    display: block;
    width: 100%;
    height: auto;
}

.flashcard-back {
    transform: rotateY(180deg);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    padding: 40px;
    backface-visibility: hidden;
}

.domain-badge {
    display: inline-block;
    background: #232F3E;
    color: white;
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 0.85em;
    margin-bottom: 20px;
}

.question {
    font-size: 1.3em;
    color: #232F3E;
    text-align: center;
    line-height: 1.6;
    word-wrap: break-word;
    overflow-wrap: break-word;
    margin-bottom: 25px;
}

.question.quiz-question {
    font-size: 1.2em;
    text-align: left;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid #f0f0f0;
}

.answer {
    font-size: 1.1em;
    color: #333;
    text-align: center;
    line-height: 1.8;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.navigation {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 15px;
    margin-bottom: 30px;
}

.nav-btn {
    padding: 15px;
    background: white;
    color: #232F3E;
    border: 2px solid #232F3E;
}

.nav-btn:hover {
    background: #232F3E;
    color: white;
}

.progress-bar {
    background: white;
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.progress-fill {
    height: 30px;
    background: linear-gradient(90deg, #FF9900, #ec7211);
    border-radius: 5px;
    transition: width 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
}

.mode-selector {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-top: 15px;
}

.mode-btn {
    padding: 15px;
    background: white;
    color: #232F3E;
    border: 2px solid #FF9900;
}

.mode-btn.active {
    background: #FF9900;
    color: white;
}

footer {
    background: white;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    margin-top: 30px;
}

footer a {
    color: #FF9900;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

.quiz-option {
    background: #f8f9fa;
    padding: 14px 18px;
    margin: 8px 0;
    border-radius: 10px;
    border: 2px solid #e0e0e0;
    cursor: pointer;
    transition: all 0.2s ease;
    word-wrap: break-word;
    overflow-wrap: break-word;
    line-height: 1.5;
    text-align: left;
    font-size: 1em;
    display: flex;
    align-items: flex-start;
}

.quiz-option:hover {
    border-color: #FF9900;
    background: #fff5e6;
    transform: translateX(5px);
    box-shadow: 0 2px 8px rgba(255, 153, 0, 0.2);
}

.quiz-option.correct {
    border-color: #28a745;
    background: #d4edda;
    font-weight: 500;
}

.quiz-option.incorrect {
    border-color: #dc3545;
    background: #f8d7da;
}

.quiz-option.disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

#quizOptionsContainer {
    width: 100%;
    margin-top: 10px;
}

.quiz-explanation {
    margin-top: 20px;
    padding: 18px;
    border-radius: 10px;
    animation: slideIn 0.3s ease;
    line-height: 1.6;
}

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

.quiz-explanation-title {
    font-weight: bold;
    display: block;
    margin-bottom: 10px;
    font-size: 1.1em;
}

.quiz-explanation-text {
    color: #333;
    margin: 0;
}

.quiz-explanation-extra {
    color: #555;
    margin-top: 10px;
    font-style: italic;
    font-size: 0.95em;
}

@media (max-width: 768px) {
    h1 {
        font-size: 1.5em;
        padding: 10px;
    }

    header {
        padding: 20px 15px;
    }

    .subtitle {
        font-size: 1em;
    }

    .exam-info {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }

    .info-card {
        padding: 10px;
        font-size: 0.9em;
    }

    .controls {
        padding: 15px;
    }

    .stats {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }

    .stat-card {
        padding: 15px 10px;
    }

    .stat-number {
        font-size: 1.5em;
    }

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

    .progress-bar {
        padding: 15px;
        margin-bottom: 15px;
    }

    .progress-fill {
        height: 25px;
        font-size: 0.9em;
    }

    .flashcard-container {
        padding: 0 10px;
        min-height: 380px;
    }

    .flashcard {
        padding: 30px 20px;
        min-height: 360px;
    }

    .flashcard.quiz-mode {
        padding: 20px 15px;
        min-height: auto;
    }

    .flashcard-content {
        padding: 0;
        width: 100%;
    }

    .flashcard-back {
        padding: 30px 20px;
    }

    .question, .answer {
        font-size: 1.1em;
        padding: 0;
        line-height: 1.7;
    }

    .question.quiz-question {
        font-size: 1em;
        padding-bottom: 12px;
        margin-bottom: 15px;
    }

    .domain-badge {
        font-size: 0.75em;
        padding: 6px 12px;
        margin-bottom: 20px;
    }

    .quiz-option {
        padding: 12px 14px;
        font-size: 0.92em;
        margin: 6px 0;
    }

    .quiz-option strong {
        font-size: 0.95em;
    }

    .quiz-explanation {
        padding: 12px;
        font-size: 0.9em;
        margin-top: 15px;
    }

    .quiz-explanation-title {
        font-size: 1em;
        margin-bottom: 8px;
    }

    .quiz-explanation-text {
        font-size: 0.9em;
    }

    .quiz-explanation-extra {
        font-size: 0.85em;
    }

    .navigation {
        grid-template-columns: 1fr;
        gap: 10px;
        padding: 0 10px;
    }

    .nav-btn {
        padding: 14px;
        font-size: 0.95em;
    }

    button, select {
        font-size: 15px;
        padding: 12px;
    }

    .mode-selector {
        gap: 10px;
    }

    .mode-btn {
        padding: 12px;
        font-size: 0.95em;
    }

    footer {
        padding: 15px;
        font-size: 0.9em;
    }

    .container {
        padding: 10px;
    }

    body {
        padding: 10px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.3em;
    }

    .subtitle {
        font-size: 0.9em;
    }

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

    .stat-number {
        font-size: 1.3em;
    }

    .flashcard-container {
        min-height: 340px;
    }

    .flashcard {
        min-height: 320px;
        padding: 25px 15px;
    }

    .flashcard-content {
        padding: 0;
    }

    .flashcard-back {
        padding: 25px 15px;
    }

    .question, .answer {
        font-size: 1em;
        line-height: 1.6;
    }

    .domain-badge {
        margin-bottom: 15px;
        font-size: 0.7em;
    }

    .navigation {
        gap: 8px;
    }

    .nav-btn {
        padding: 12px;
        font-size: 0.9em;
    }
}