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

:root {
    --bg-color: #0f121a;
    --card-bg-color: #1a202c;
    --primary-color: #4a90e2;
    --secondary-color: #50e3c2;
    --text-color: #e2e8f0;
    --text-light-color: #a0aec0;
    --correct-color: #2ecc71;
    --incorrect-color: #e74c3c;
    --button-bg-color: #2b6cb0;
    --button-hover-color: #4c81c9;
    --border-color: #2d3748;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 900px;
    background: radial-gradient(circle at top left, var(--card-bg-color) 0%, transparent 60%);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
    position: relative;
    overflow: hidden;
    animation: fadeIn 1s ease-in-out;
}

.container::before {
    content: '';
    position: absolute;
    top: -50px;
    left: -50px;
    width: 200px;
    height: 200px;
    background: rgba(74, 144, 226, 0.1);
    border-radius: 50%;
    z-index: -1;
    filter: blur(50px);
}

.container::after {
    content: '';
    position: absolute;
    bottom: -50px;
    right: -50px;
    width: 250px;
    height: 250px;
    background: rgba(80, 227, 194, 0.1);
    border-radius: 50%;
    z-index: -1;
    filter: blur(60px);
}

header {
    text-align: center;
    margin-bottom: 40px;
}

.title {
    font-size: 3rem;
    font-weight: 700;
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.highlight {
    color: var(--primary-color);
}

.subtitle {
    font-size: 1.2rem;
    color: var(--text-light-color);
    margin: 10px 0 0;
}

.card {
    background-color: var(--card-bg-color);
    border-radius: 15px;
    padding: 30px;
    box-shadow: inset 0 0 15px rgba(0, 0, 0, 0.5);
    transition: all 0.3s ease-in-out;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

.card-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 20px;
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 10px;
}

.card-text {
    font-size: 1rem;
    color: var(--text-light-color);
    line-height: 1.6;
}

.btn {
    display: block;
    width: 100%;
    max-width: 300px;
    margin: 20px auto 0;
    padding: 15px;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-color);
    background-color: var(--button-bg-color);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn:hover {
    background-color: var(--button-hover-color);
    transform: translateY(-2px);
}

.options {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 20px;
}

.option {
    background-color: #2c3340;
    color: var(--text-color);
    padding: 15px;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    border: 1px solid var(--border-color);
}

.option:hover {
    background-color: #3b4554;
    transform: translateX(5px);
}

.option.selected {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
    transform: translateX(5px);
    box-shadow: 0 4px 8px rgba(74, 144, 226, 0.3);
}

.option.correct {
    background-color: var(--correct-color);
    border-color: var(--correct-color);
    color: #fff;
    font-weight: bold;
}

.option.incorrect {
    background-color: var(--incorrect-color);
    border-color: var(--incorrect-color);
    color: #fff;
    font-weight: bold;
}

.feedback-container {
    margin: 20px 0;
    padding: 15px;
    border-radius: 10px;
    background-color: #2c3340;
    border: 1px solid var(--border-color);
    display: none;
    animation: slideDown 0.3s ease-in-out;
}

.feedback-message {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: bold;
    font-size: 1.1rem;
    margin-bottom: 10px;
}

.feedback-icon {
    font-size: 1.3rem;
    width: 25px;
    height: 25px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.feedback-correct .feedback-icon {
    background-color: var(--correct-color);
}

.feedback-incorrect .feedback-icon {
    background-color: var(--incorrect-color);
}

.feedback-correct .feedback-text {
    color: var(--correct-color);
}

.feedback-incorrect .feedback-text {
    color: var(--incorrect-color);
}

.feedback-explanation {
    color: var(--text-light-color);
    line-height: 1.5;
    font-style: italic;
    padding-left: 35px;
}

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

.navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 20px;
}

.nav-btn {
    width: 48%;
    margin: 0;
    background-color: var(--secondary-color);
    color: var(--bg-color);
}

.nav-btn:hover {
    background-color: #45bfac;
}

.status-bar {
    margin-top: 30px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.progress-bar {
    height: 10px;
    flex-grow: 1;
    background-color: var(--border-color);
    border-radius: 5px;
    overflow: hidden;
}

#progress-bar {
    width: 0%;
    height: 100%;
    background-color: var(--primary-color);
    transition: width 0.4s ease-in-out;
}

.counter {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--secondary-color);
}

#result-details {
    margin-top: 20px;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
}

.result-item {
    background-color: #2c3340;
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 10px;
}

.result-question {
    font-weight: bold;
    color: var(--primary-color);
}

.result-answer {
    margin-top: 5px;
    font-style: italic;
    color: var(--text-light-color);
}

.result-answer.correct {
    color: var(--correct-color);
}

.result-answer.incorrect {
    color: var(--incorrect-color);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}