body {
    background: radial-gradient(circle at center, #66D7D1 0%, #7B2E52 100%);
    display: flex;
    justify-content: center;
    align-items: center;
}

.quiz-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 40px 20px;
}

.quiz-card {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: #f0f0f0;
    border-radius: 3px;
    margin: 20px 0 40px;
    overflow: hidden;
}

.progress {
    height: 100%;
    background: linear-gradient(90deg, #66D7D1, #7B2E52);
    border-radius: 3px;
    width: 0%;
    transition: width 0.3s ease;
}

.question-number {
    color: #66D7D1;
    font-weight: 600;
    margin-bottom: 10px;
}

.question-text {
    font-size: 1.4em;
    color: #333;
    margin-bottom: 30px;
    line-height: 1.4;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 30px;
}

.option {
    background: #f8f9fa;
    border: 2px solid #e9ecef;
    border-radius: 12px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.1em;
}

.option:hover {
    border-color: #66D7D1;
    background: #f0fdff;
}

.option.selected {
    border-color: #7B2E52;
    background: #fdf0f5;
}

.nav-buttons {
    display: flex;
    justify-content: space-between;
    gap: 15px;
}

.nav-btn {
    padding: 15px 30px;
    border: 2px solid #66D7D1;
    background: white;
    color: #66D7D1;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s ease;
}

.nav-btn:hover {
    background: #66D7D1;
    color: white;
}

.nav-btn.primary {
    background: #7B2E52;
    border-color: #7B2E52;
    color: white;
}

.nav-btn.primary:hover {
    background: #66D7D1;
    border-color: #66D7D1;
}

.nav-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.hidden {
    display: none;
}

.loading {
    text-align: center;
    padding: 40px;
}