.stt-root {
    max-width: 900px;
    margin: 20px auto;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
}

.stt-test-config {
    background: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
}

.stt-config-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.stt-config-item label {
    font-weight: 600;
    color: #495057;
    font-size: 14px;
}

.stt-config-select {
    padding: 8px 12px;
    border: 1px solid #ced4da;
    border-radius: 4px;
    font-size: 14px;
    min-width: 120px;
}

.stt-test-area {
    background: white;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.stt-words {
    min-height: 120px;
    margin-bottom: 20px;
    font-family: 'Courier New', monospace;
    background: #f8f9fa;
    padding: 20px;
    border-radius: 6px;
    border: 2px solid #e9ecef;
    font-size: 18px;
    line-height: 1.6;
    transition: border-color 0.3s ease;
}

.stt-words.active {
    border-color: #007cba;
}

.stt-word {
    margin: 0 4px;
    padding: 2px 4px;
    border-radius: 3px;
    transition: all 0.2s ease;
}

.stt-word.current {
    background-color: #007cba;
    color: white;
}

.stt-word.correct {
    color: #28a745;
}

.stt-word.incorrect {
    color: #dc3545;
    background-color: #ffe6e6;
}

.stt-word.extra {
    color: #ffc107;
    text-decoration: line-through;
}

.stt-input {
    width: 100%;
    font-size: 18px;
    padding: 15px;
    border: 2px solid #e9ecef;
    border-radius: 6px;
    resize: vertical;
    font-family: 'Courier New', monospace;
    transition: border-color 0.3s ease;
}

.stt-input:focus {
    outline: none;
    border-color: #007cba;
    box-shadow: 0 0 0 3px rgba(0,124,186,0.1);
}

.stt-input:disabled {
    background-color: #f8f9fa;
    cursor: not-allowed;
}

.stt-controls {
    display: flex;
    gap: 15px;
    align-items: center;
    margin: 20px 0;
    flex-wrap: wrap;
}

.stt-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.stt-btn-primary {
    background: #007cba;
    color: white;
}

.stt-btn-primary:hover:not(:disabled) {
    background: #005a87;
    transform: translateY(-1px);
}

.stt-btn-primary:disabled {
    background: #6c757d;
    cursor: not-allowed;
}

.stt-btn-secondary {
    background: #6c757d;
    color: white;
}

.stt-btn-secondary:hover {
    background: #545b62;
    transform: translateY(-1px);
}

.stt-timer {
    font-size: 24px;
    font-weight: bold;
    color: #dc3545;
    background: #fff;
    padding: 10px 20px;
    border: 2px solid #dc3545;
    border-radius: 6px;
    min-width: 80px;
    text-align: center;
}

.stt-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin: 20px 0;
}

.stt-stat {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 6px;
    text-align: center;
    border: 1px solid #e9ecef;
}

.stt-stat-label {
    display: block;
    font-size: 12px;
    color: #6c757d;
    text-transform: uppercase;
    font-weight: 600;
    margin-bottom: 5px;
}

.stt-stat-value {
    display: block;
    font-size: 24px;
    font-weight: bold;
    color: #007cba;
}

.stt-leaderboard {
    margin-top: 30px;
    background: white;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    padding: 25px;
}

.stt-leaderboard h3 {
    margin: 0 0 20px 0;
    color: #343a40;
    font-size: 20px;
}

.stt-leaderboard-content {
    max-height: 300px;
    overflow-y: auto;
}

.stt-leaderboard-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    border-bottom: 1px solid #e9ecef;
}

.stt-leaderboard-item:nth-child(-n+3) {
    background: #fff3cd;
    border-left: 4px solid #ffc107;
}

.stt-leaderboard-rank {
    font-weight: bold;
    color: #007cba;
    min-width: 30px;
}

.stt-leaderboard-user {
    flex: 1;
    margin: 0 15px;
}

.stt-leaderboard-stats {
    text-align: right;
}

.stt-leaderboard-wpm {
    font-weight: bold;
    color: #28a745;
    font-size: 16px;
}

.stt-leaderboard-accuracy {
    font-size: 12px;
    color: #6c757d;
}

.stt-results {
    margin-top: 30px;
    background: #d4edda;
    border: 1px solid #c3e6cb;
    border-radius: 8px;
    padding: 25px;
}

.stt-results h3 {
    margin: 0 0 15px 0;
    color: #155724;
}

.stt-loading {
    text-align: center;
    color: #6c757d;
    font-style: italic;
}

/* Responsive design */
@media (max-width: 768px) {
    .stt-test-config {
        flex-direction: column;
        gap: 15px;
    }
    
    .stt-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .stt-stats {
        grid-template-columns: 1fr 1fr;
    }
    
    .stt-words {
        font-size: 16px;
        padding: 15px;
    }
    
    .stt-input {
        font-size: 16px;
    }
}

/* Animation for test start */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.stt-test-starting {
    animation: pulse 0.5s ease-in-out 3;
}