/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header styles */
header {
    text-align: center;
    margin-bottom: 40px;
    background: rgba(255, 255, 255, 0.95);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 2.5rem;
    color: #4a4a4a;
    margin-bottom: 10px;
    font-weight: 700;
}

.instruction {
    font-size: 1.1rem;
    color: #666;
    line-height: 1.6;
}

/* Test area styles */
.test-area {
    background: rgba(255, 255, 255, 0.95);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
    text-align: center;
}

.word-display {
    margin-bottom: 40px;
    padding: 60px 30px;
    background: #f8f9fa;
    border-radius: 15px;
    border: 3px solid #e9ecef;
    transition: all 0.3s ease;
}

.word-display.flash {
    border-color: #667eea;
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.5);
}

.word-display:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

#stroop-word {
    font-size: 4rem;
    font-weight: bold;
    letter-spacing: 2px;
    text-transform: uppercase;
    transition: all 0.3s ease;
}

/* Color buttons */
.color-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.color-btn {
    padding: 20px 15px;
    font-size: 1.1rem;
    font-weight: bold;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    text-transform: uppercase;
    letter-spacing: 1px;
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.color-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.color-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.color-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Control buttons */
.controls {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.control-btn {
    padding: 15px 30px;
    font-size: 1.1rem;
    font-weight: 600;
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.control-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.control-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Stats section */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-item {
    background: rgba(255, 255, 255, 0.95);
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: all 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.stat-item label {
    display: block;
    font-weight: 600;
    color: #666;
    margin-bottom: 10px;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-item span {
    font-size: 2rem;
    font-weight: bold;
    color: #4a4a4a;
}

/* Results section */
.results-section {
    background: rgba(255, 255, 255, 0.95);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
}

.results-section h3 {
    text-align: center;
    font-size: 2rem;
    color: #4a4a4a;
    margin-bottom: 30px;
    font-weight: 700;
}

#results-summary {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 12px;
    margin-bottom: 30px;
    border-left: 5px solid #667eea;
}

#results-table {
    width: 100%;
    border-collapse: collapse;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

#results-table th,
#results-table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid #e9ecef;
}

#results-table th {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.9rem;
}

#results-table tbody tr:hover {
    background-color: #f8f9fa;
}

.correct {
    color: #28a745;
    font-weight: bold;
}

.incorrect {
    color: #dc3545;
    font-weight: bold;
}

.congruent {
    color: #007bff;
    font-weight: bold;
}

.incongruent {
    color: #fd7e14;
    font-weight: bold;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    #stroop-word {
        font-size: 2.5rem;
    }
    
    .color-buttons {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .color-btn {
        padding: 15px 20px;
        font-size: 1rem;
    }
    
    .controls {
        flex-direction: column;
        align-items: center;
    }
    
    .control-btn {
        width: 100%;
        max-width: 300px;
    }
    
    .stat-item span {
        font-size: 1.5rem;
    }
}

/* Animation classes */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

.pulse {
    animation: pulse 0.3s ease-in-out;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.shake {
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}