* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background: linear-gradient(135deg, #0626b3 0%, #3799c7 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 25px;
}

.section-1 {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 35px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.section-2-container {
    position: sticky;
    top: 20px;
    height: fit-content;
}

.section-2 {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.08);
}

h1 {
    margin: 0 0 25px;
    color: #2c3e50;
    font-size: 2.2rem;
    font-weight: 600;
    padding: 20px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    background: linear-gradient(135deg, #f8fafc, #ffffff);
}

.logo {
    display: block;
    margin: 0 auto 25px;
    max-width: 90px;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.select-panel {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 25px;
}

.select-panel button {
    padding: 14px 28px;
    font-size: 16px;
    font-weight: 500;
    border: 2px solid #3b82f6;
    border-radius: 8px;
    background: #ffffff;
    color: #3b82f6;
    cursor: pointer;
    min-height: 46px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.15);
}

.select-panel button:hover {
    background: #3b82f6;
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(59, 130, 246, 0.25);
}

.select-panel button:active {
    transform: translateY(0);
}

.select-panel button.active {
    background: #3b82f6;
    color: #ffffff;
    box-shadow: 0 4px 16px rgba(59, 130, 246, 0.3);
}

.select-container {
    margin-bottom: 20px;
}

.select-container h3 {
    margin: 0 0 12px;
    color: #4a5568;
    font-weight: 600;
}

.select-container select {
    width: 100%;
    max-width: 320px;
    padding: 14px 16px;
    font-size: 16px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    background: #ffffff;
    cursor: pointer;
    min-height: 46px;
    transition: all 0.2s ease;
}

.select-container select:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

#startQuiz {
    padding: 16px 32px;
    font-size: 18px;
    font-weight: 600;
    background: linear-gradient(135deg, #10b981, #34d399);
    color: #ffffff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    min-height: 50px;
    transition: all 0.3s ease;
    margin: 25px 0 35px;
    box-shadow: 0 4px 16px rgba(16, 185, 129, 0.3);
}

#startQuiz:hover {
    background: linear-gradient(135deg, #059669, #10b981);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

#startQuiz:active {
    transform: translateY(0);
}

#quiz {
    text-align: left;
    margin-bottom: 25px;
}

.question {
    font-weight: 600;
    margin: 25px 0 18px;
    font-size: 18px;
    color: #1f2937;
    line-height: 1.5;
}

.option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    margin: 10px 0;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    cursor: pointer;
    background: #ffffff;
    transition: all 0.25s ease;
    min-height: 48px;
}

.option input[type="radio"] {
    appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid #d1d5db;
    border-radius: 50%;
    background: #ffffff;
    margin: 0;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.option input[type="radio"]:checked {
    border-color: #3b82f6;
    background: #3b82f6;
}

.option input[type="radio"]:checked::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 8px;
    height: 8px;
    background: #ffffff;
    border-radius: 50%;
    transform: translate(-50%, -50%);
}

.option label {
    flex: 1;
    cursor: pointer;
    font-size: 15px;
    line-height: 1.4;
}

.option:hover {
    border-color: #3b82f6;
    background: #f8faff;
    transform: translateX(4px);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.15);
}

.option.selected {
    background: #eff6ff;
    border-color: #3b82f6;
    transform: translateX(4px);
}

.option.correct {
    background: #ecfdf5;
    border-color: #10b981;
    color: #065f46;
}

.option.incorrect {
    background: #fef2f2;
    border-color: #ef4444;
    color: #991b1b;
}

#submitBtn,
#showAnswers {
    padding: 12px 20px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    min-height: 46px;
    transition: all 0.3s ease;
    display: block;
    width: 100%;
    margin-bottom: 12px;
}

#submitBtn {
    background: linear-gradient(135deg, #10b981, #34d399);
    color: #ffffff;
    box-shadow: 0 3px 12px rgba(16, 185, 129, 0.3);
}

#submitBtn:hover {
    background: linear-gradient(135deg, #059669, #10b981);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(16, 185, 129, 0.4);
}

#showAnswers {
    background: linear-gradient(135deg, #8b5cf6, #a78bfa);
    color: #ffffff;
    box-shadow: 0 3px 12px rgba(139, 92, 246, 0.3);
}

#showAnswers:hover {
    background: linear-gradient(135deg, #7c3aed, #8b5cf6);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(139, 92, 246, 0.4);
}

button:active {
    transform: translateY(1px) !important;
}

#result,
#resultMobile {
    font-weight: 600;
    padding: 16px;
    border-radius: 8px;
    background: linear-gradient(135deg, #f0f9ff, #e0f2fe);
    border: 1px solid #0ea5e9;
    color: #0c4a6e;
    margin: 12px 0;
}

#checksBox {
    font-size: 14px;
    margin-bottom: 20px;
    background: #f8fafc;
    padding: 16px;
    border-radius: 8px;
    border: 1px solid #e2e8f0;
}

#checksBox a {
    display: block;
    margin: 8px 0;
    color: #64748b;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

#checksBox a:hover {
    color: #3b82f6;
}

#checksBox input {
    margin-left: 10px;
    transform: scale(1.1);
    accent-color: #3b82f6;
}

#citation {
    margin-top: 16px;
    padding: 16px;
    background: linear-gradient(135deg, #fffbeb, #fef3c7);
    border: 1px solid #f59e0b;
    border-radius: 8px;
    font-style: italic;
    color: #92400e;
}

.mobile-controls {
    display: none;
    text-align: center;
    margin-top: 25px;
}

.mobile-controls button {
    width: 100%;
    padding: 14px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    min-height: 48px;
    margin-bottom: 12px;
    transition: all 0.3s ease;
}

#submitBtnMobile {
    background: linear-gradient(135deg, #10b981, #34d399);
    color: #ffffff;
    box-shadow: 0 3px 12px rgba(16, 185, 129, 0.3);
}

#showAnswersMobile {
    background: linear-gradient(135deg, #381096, #180b41);
    color: #ffffff;
    box-shadow: 0 3px 12px rgba(139, 92, 246, 0.3);
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .container {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 10px;
    }
    
    .section-1 {
        padding: 25px 20px;
    }
    
.section-2 {
        display: none;
    }
    
    .mobile-controls {
        display: block;
    }
    
    .select-panel {
        flex-direction: column;
        align-items: center;
    }
    
    .select-panel button {
        width: 100%;
        max-width: 280px;
    }
    
    h1 {
        font-size: 1.8rem;
        padding: 16px;
    }
    
    .question {
        font-size: 16px;
        margin: 20px 0 15px;
    }
    
    .option {
        padding: 12px 14px;
        font-size: 15px;
    }
}

@media (max-width: 480px) {
    .section-1 {
        padding: 20px 15px;
    }
    
    h1 {
        font-size: 1.5rem;
        padding: 12px;
    }
    
    .select-panel button {
        padding: 12px 20px;
        font-size: 14px;
        min-height: 44px;
    }
    
    .select-container select {
        padding: 12px;
        font-size: 14px;
        min-height: 44px;
    }
    
    #startQuiz {
        padding: 14px 28px;
        font-size: 16px;
        min-height: 48px;
    }
    
    .question {
        font-size: 15px;
    }
    
    .option {
        padding: 10px 12px;
        font-size: 14px;
        min-height: 44px;
    }
}