.quiz-container {
    background: var(--nav-dark);
    border-radius: 20px;
    padding: 2.5rem;
    margin: 3rem auto;
    max-width: 850px;
    box-shadow: var(--shadow);
    transition: background 0.5s ease, box-shadow 0.5s ease;
}

body.light-mode .quiz-container {
    background: var(--nav-light);
}

.quiz-header {
    margin-bottom: 2rem;
    text-align: center;
}


.quiz-progress {
    margin-bottom: 2rem;
    position: relative;
}

.progress-bar {
    height: 10px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 5px;
    overflow: hidden;
    position: relative;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: var(--progress, 10%);
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 5px;
    transition: width 0.4s ease-in-out;
}

.progress-text {
    font-size: 0.95rem;
    color: var(--secondary);
    text-align: right;
    margin-top: 0.3rem;
}

body.light-mode .progress-text {
    color: var(--primary);
}


.quiz-question {
    margin-bottom: 2rem;
}

.quiz-question h2 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    text-align: center;
}


.quiz-options {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.2rem;
    margin-bottom: 2rem;
}

.option {
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    padding: 1.2rem;
    cursor: pointer;
    transition: background 0.3s, transform 0.3s;
    font-size: 1rem;
}

body.light-mode .option {
    background: rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.option:hover {
    background: rgba(0, 204, 255, 0.25);
    transform: translateY(-4px);
}

.option.selected {
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    color: #fff;
    border-color: transparent;
}


.quiz-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 2.5rem;
}

.quiz-navigation button {
    padding: 0.8rem 2rem;
    border-radius: 30px;
    font-weight: bold;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-dark);
    transition: background 0.3s, transform 0.3s;
}

body.light-mode .quiz-navigation button {
    background: rgba(0, 0, 0, 0.07);
    color: var(--text-light);
}

.quiz-navigation button:hover:not(:disabled) {
    background: rgba(0, 204, 255, 0.25);
    transform: translateY(-2px);
}

.quiz-navigation button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

#submit-btn {
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    color: #fff;
}


.hidden {
    display: none;
}

.quiz-result {
    background: var(--nav-dark);
    border-radius: 20px;
    padding: 2.5rem;
    margin: 3rem auto;
    max-width: 850px;
    box-shadow: var(--shadow);
    animation: fadeIn 0.6s ease-out;
    transition: background 0.5s ease, box-shadow 0.5s ease;
}

body.light-mode .quiz-result {
    background: var(--nav-light);
}

.quiz-result h2 {
    color: var(--secondary);
    text-align: center;
}

body.light-mode .quiz-result h2 {
    color: var(--primary);
}

#score {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--secondary);
    text-align: center;
    margin-top: 1rem;
}

body.light-mode #score {
    color: var(--primary);
}

#result-details {
    margin-top: 2rem;
    text-align: left;
}

.result-item {
    margin-bottom: 1.2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    transition: background 0.3s;
}

body.light-mode .result-item {
    border-bottom: 1px solid rgba(0, 0, 0, 0.15);
}

.result-item.correct {
    color: #4caf50;
}

.result-item.incorrect {
    color: #f44336;
}


#restart-btn {
    display: block;
    margin: 2rem auto 0;
    padding: 0.9rem 2.2rem;
    border-radius: 30px;
    font-weight: bold;
    font-size: 1.1rem;
    cursor: pointer;
    border: none;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    color: #fff;
    transition: background 0.3s, transform 0.3s;
}

#restart-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
}