:root {
    --card-shadow: var(--shadow);
    --text-primary: var(--text-color);
    --text-secondary: var(--secondary-color);
    --bg-color: var(--background-color);
    --border-color: #dee2e6;
    --input-bg: #fff;
    --primary-rgb: 0, 123, 255;
    --primary-hover: #0056b3;
}

.tool-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    margin-top: 20px;
}

.tool-header h1 {
    margin: 0;
    font-size: 1.8rem;
}

.tool-header p {
    margin: 0;
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .tool-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
}

.tool-container {
    max-width: 1200px;
    margin: 20px auto;
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
}

.control-panel {
    background: var(--bg-color);
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 1rem;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    background: var(--input-bg);
    color: var(--text-primary);
}

.sliders-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 1rem;
}

input[type="range"] {
    width: 100%;
    height: 6px;
    background: #ddd;
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: background .15s ease-in-out;
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--primary-hover);
}

.text-area-container {
    position: relative;
    margin-bottom: 1.5rem;
}

textarea {
    width: 100%;
    height: 200px;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    resize: vertical;
    font-family: inherit;
    background: var(--input-bg);
    color: var(--text-primary);
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(var(--primary-rgb), 0.1);
}

.char-count {
    position: absolute;
    bottom: 10px;
    right: 10px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.8);
    padding: 2px 6px;
    border-radius: 4px;
}

.action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 1rem;
}

.tool-container button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 24px;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 600;
}

.tool-container button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.primary-btn:hover:not(:disabled) {
    background: var(--primary-hover);
}

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

.secondary-btn:hover:not(:disabled) {
    background: #5a6268;
}

.danger-btn {
    background: #dc3545;
    color: white;
}

.danger-btn:hover:not(:disabled) {
    background: #c82333;
}

.outline-btn {
    background: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

.outline-btn:hover:not(:disabled) {
    background: rgba(var(--primary-rgb), 0.1);
}

.download-section {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.download-tip {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.status-bar {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    min-height: 1.5em;
    margin-top: 1rem;
}

.tool-info ul {
    padding-left: 1.2rem;
}

@media (max-width: 600px) {
    .sliders-group {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .tool-container button {
        width: 100%;
    }
}