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

body {
    font-family: 'Inter', sans-serif;
    background: #f5f5f5;
    color: #2c3e50;
    line-height: 1.5;
}

.header {
    background: #2c3e50;
    color: white;
    padding: 1.5rem 2rem;
    border-bottom: 3px solid #34495e;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

.header p {
    font-size: 0.9rem;
    color: #bdc3c7;
    margin-top: 0.25rem;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.timer-section {
    background: white;
    border: 2px solid #34495e;
    border-radius: 4px;
    padding: 2rem;
    margin-bottom: 2rem;
    text-align: center;
}

.timer-label {
    font-size: 0.875rem;
    color: #7f8c8d;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
}

.timer-display {
    font-family: 'Roboto Mono', monospace;
    font-size: 4rem;
    font-weight: 500;
    color: #2c3e50;
}

.timer-display.warning {
    color: #e67e22;
}

.timer-display.danger {
    color: #e74c3c;
}

.timer-display.inactive {
    color: #bdc3c7;
}

.main-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.section {
    background: white;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 1.5rem;
}

.section-title {
    font-size: 1rem;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid #ecf0f1;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: #34495e;
    margin-bottom: 0.5rem;
}

.form-input {
    width: 100%;
    padding: 0.625rem 0.75rem;
    border: 1px solid #cbd5e0;
    border-radius: 3px;
    font-size: 0.9375rem;
    font-family: inherit;
    transition: border-color 0.15s;
}

.form-input:focus {
    outline: none;
    border-color: #3498db;
}

.form-input:disabled {
    background: #f8f9fa;
    color: #adb5bd;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.radio-group {
    display: flex;
    gap: 1.5rem;
    margin-top: 0.5rem;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.radio-label input {
    cursor: pointer;
}

.btn {
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: 3px;
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    font-family: inherit;
}

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

.btn-primary {
    background: #3498db;
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: #2980b9;
}

.btn-success {
    background: #27ae60;
    color: white;
}

.btn-success:hover:not(:disabled) {
    background: #229954;
}

.btn-danger {
    background: #e74c3c;
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background: #c0392b;
}

.btn-secondary {
    background: #95a5a6;
    color: white;
}

.btn-secondary:hover:not(:disabled) {
    background: #7f8c8d;
}

.btn-warning {
    background: #f39c12;
    color: white;
}

.btn-warning:hover:not(:disabled) {
    background: #e67e22;
}

.btn-group {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
}

.controls-section {
    background: white;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.controls-section .btn-group {
    margin-top: 0;
}

textarea {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.5;
    resize: vertical;
}

.word-display {
    background: white;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 1.5rem;
}

.word-list-container {
    max-height: 500px;
    overflow-y: auto;
    margin-top: 1rem;
}

.word-item {
    background: #fafafa;
    border: 1px solid #e0e0e0;
    border-radius: 3px;
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background 0.15s;
}

.word-item:hover {
    background: #f0f0f0;
}

.word-item.active {
    background: #e3f2fd;
    border-color: #3498db;
}

.word-item.correct {
    background: #e8f5e9;
    border-color: #27ae60;
}

.word-item.incorrect {
    background: #ffebee;
    border-color: #e74c3c;
}

.word-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex: 1;
}

.word-index {
    font-family: 'Roboto Mono', monospace;
    font-size: 0.8125rem;
    color: #7f8c8d;
    min-width: 2.5rem;
}

.word-text {
    font-size: 0.9375rem;
    color: #2c3e50;
}

.word-timer {
    font-family: 'Roboto Mono', monospace;
    font-size: 1rem;
    color: #34495e;
    min-width: 4rem;
    text-align: right;
}

.word-checkbox {
    margin-left: 1rem;
}

.placeholder {
    text-align: center;
    padding: 3rem 1rem;
    color: #95a5a6;
}

.small-text {
    font-size: 0.8125rem;
    color: #7f8c8d;
    margin-top: 0.25rem;
}

.status-message {
    padding: 0.75rem 1rem;
    border-radius: 3px;
    margin-top: 1rem;
    font-size: 0.875rem;
}

.status-message.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.status-message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

@media (max-width: 768px) {
    .main-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .timer-display {
        font-size: 3rem;
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}