@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

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

:root {
    --bg-color: #010001;
    --primary-color: #3ecf8e;
    --primary-hover: #2fb87a;
    --card-bg: rgba(255, 255, 255, 0.02);
    --card-border: rgba(255, 255, 255, 0.06);
    --text-color: #ededed;
    --text-secondary: #8b8b8b;
    --text-muted: #666666;
    --correct: #3ecf8e;
    --incorrect: #f04438;
    --warning: #f79009;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.6;
    position: relative;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 24px;
    width: 100%;
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 1;
}

header {
    text-align: center;
    padding: 0 0 60px;
}

.logo {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -1px;
    color: var(--text-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

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

main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.screen {
    display: none;
    width: 100%;
    animation: fadeIn 0.3s ease-in;
}

.screen.active {
    display: block;
}

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

.welcome-card,
.question-card,
.results-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 32px;
    border: 1px solid var(--card-border);
    max-width: 480px;
    margin: 0 auto;
    width: 100%;
}

.welcome-card h2,
.results-card h2 {
    font-size: 1.875rem;
    margin-bottom: 8px;
    text-align: center;
    font-weight: 600;
    letter-spacing: -0.5px;
    color: var(--text-color);
}

.welcome-card p {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 32px;
    font-size: 1rem;
    font-weight: 400;
}

.settings {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 32px;
}

.setting-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.setting-group label {
    font-weight: 500;
    color: var(--text-color);
    font-size: 0.875rem;
}

select {
    background: rgba(0, 0, 0, 0.3);
    color: var(--text-color);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 10px 12px;
    font-size: 0.9375rem;
    font-weight: 400;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: 'Inter', sans-serif;
}

select:hover {
    border-color: var(--text-secondary);
}

select:focus {
    outline: none;
    border-color: var(--primary-color);
}

select option {
    background: #0a0a0a;
    color: var(--text-color);
    padding: 10px;
}

.btn {
    padding: 10px 16px;
    font-size: 0.9375rem;
    font-weight: 500;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: 'Inter', sans-serif;
}

.btn-primary {
    background: var(--primary-color);
    color: #000000;
    width: 100%;
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-secondary {
    background: transparent;
    color: var(--text-color);
    border: 1px solid var(--card-border);
    width: 100%;
}

.btn-secondary:hover {
    border-color: var(--text-secondary);
}

#next-btn {
    max-width: 200px;
    margin: 0 auto;
}

.quiz-header {
    margin-bottom: 32px;
}

.progress-bar {
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 20px;
}

.progress-fill {
    height: 100%;
    background: var(--primary-color);
    transition: width 0.3s ease;
    border-radius: 4px;
}

.quiz-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.timer {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-color);
    font-weight: 500;
}

.timer.warning {
    color: var(--warning);
}

.timer.danger {
    color: var(--incorrect);
}

.category-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 500;
    margin-bottom: 16px;
    border: 1px solid var(--card-border);
}

#question-text {
    font-size: 1.25rem;
    margin-bottom: 32px;
    line-height: 1.6;
    font-weight: 500;
    color: var(--text-color);
}

.answers {
    display: grid;
    gap: 12px;
    margin-bottom: 32px;
}

.answer-btn {
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-color);
    border: 1px solid var(--card-border);
    padding: 14px 16px;
    border-radius: 8px;
    font-size: 0.9375rem;
    font-weight: 400;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
    font-family: 'Inter', sans-serif;
}

.answer-btn:hover:not(.correct):not(.incorrect):not(.disabled) {
    border-color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.04);
}

.answer-btn.correct {
    border-color: var(--correct);
    background: rgba(62, 207, 142, 0.1);
    color: var(--correct);
}

.answer-btn.incorrect {
    border-color: var(--incorrect);
    background: rgba(240, 68, 56, 0.1);
    color: var(--incorrect);
}

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

.results-card {
    text-align: center;
}

.score-display {
    margin: 40px 0;
}

.score-circle {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 160px;
    height: 160px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.02);
    border: 2px solid var(--card-border);
    margin: 0 auto;
}

#final-score {
    font-size: 3rem;
    font-weight: 600;
    color: var(--primary-color);
    line-height: 1;
}

.score-total {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 500;
}

#score-message {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.results-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

@media (max-width: 768px) {
    .container {
        padding: 40px 20px;
    }

    .logo {
        font-size: 2rem;
    }

    header {
        padding: 0 0 40px;
    }

    .welcome-card,
    .question-card,
    .results-card {
        padding: 24px;
    }

    .welcome-card h2,
    .results-card h2 {
        font-size: 1.5rem;
    }

    #question-text {
        font-size: 1.125rem;
    }

    .score-circle {
        width: 140px;
        height: 140px;
    }

    #final-score {
        font-size: 2.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 24px 16px;
    }

    .logo {
        font-size: 1.75rem;
    }

    .welcome-card,
    .question-card,
    .results-card {
        padding: 20px;
    }

    .welcome-card h2,
    .results-card h2 {
        font-size: 1.25rem;
    }

    #question-text {
        font-size: 1rem;
    }
}