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

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    overflow-x: hidden;
    font-family: sans-serif;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #222;
    background: url('https://4kwallpapers.com/images/wallpapers/camp-nou-fc-5120x2880-19436.jpg') repeat, #e8f5e9;
    background-size: cover;
    min-height: 100vh;
}

.container {
    max-width: 850px;
    margin: 40px auto;
    padding: 30px;
    background-color: rgba(255, 255, 255, 0.97);
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

header {
    text-align: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid #43a047;
}

h1 {
    color: #2e7d32;
    font-size: 2rem;
    margin-bottom: 10px;
}

.language-selector {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 10px;
}

.language-selector button {
    padding: 8px 16px;
    background-color: #c8e6c9;
    border: 1px solid #81c784;
    border-radius: 6px;
    cursor: pointer;
    transition: 0.3s;
}

.language-selector button.active {
    background-color: #388e3c;
    color: white;
    border-color: #2e7d32;
}

.info-panel {
    display: flex;
    justify-content: space-between;
    background-color: #e8f5e9;
    padding: 10px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.95rem;
    border: 1px solid #c8e6c9;
}

.timer, .score, .progress {
    display: flex;
    align-items: center;
    gap: 6px;
    color: #2e7d32;
    font-weight: 600;
}

.quiz-container {
    background-color: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

#question-number {
    font-weight: bold;
    color: #43a047;
    margin-bottom: 5px;
    font-size: 1.1rem;
}

#question-text {
    font-size: 1.2rem;
    margin-bottom: 20px;
}

.choices-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.choice {
    padding: 12px 18px;
    background-color: #f1f8e9;
    border: 1px solid #c5e1a5;
    border-radius: 6px;
    cursor: pointer;
    transition: 0.3s;
}

.choice:hover {
    background-color: #dcedc8;
}

.choice.selected {
    background-color: #81c784;
    color: white;
    border-color: #66bb6a;
}

.choice.correct {
    background-color: #43a047;
    color: white;
    border-color: #388e3c;
}

.choice.incorrect {
    background-color: #e53935;
    color: white;
    border-color: #c62828;
}

.controls {
    display: flex;
    justify-content: space-between;
    margin-top: 25px;
}

button {
    padding: 10px 20px;
    background-color: #43a047;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.3s;
    font-size: 1rem;
}

button:hover {
    background-color: #2e7d32;
}

button:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

#submit-btn {
    background-color: #ff3838;
}

#submit-btn:hover {
    background-color: #a30000;
}

.results {
    background-color: white;
    border-radius: 10px;
    padding: 25px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

#results-title {
    color: #2e7d32;
    margin-bottom: 15px;
    font-size: 1.5rem;
}

#results-score, #results-time {
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.result-item {
    padding: 10px;
    border-left: 4px solid #ddd;
    margin-bottom: 10px;
}

.result-item.correct {
    border-left-color: #43a047;
}

.result-item.incorrect {
    border-left-color: #e53935;
}

#start-btn {
    display: block;
    margin: 2rem auto;
    padding: 1rem 2rem;
    font-size: 1.2rem;
    cursor: pointer;
}

#restart-btn {
    margin-top: 20px;
    background-color: #ffb300;
}

#restart-btn:hover {
    background-color: #ffa000;
}

footer {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #c8e6c9;
    color: #607d8b;
    font-size: 0.85rem;
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    .info-panel {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .controls {
        flex-direction: column;
        gap: 10px;
    }

    button {
        width: 100%;
    }
}