:root {
    --primary-color: #4a6da7;
    --secondary-color: #304878;
    --bg-color: #f9f9f9;
    --card-bg: white;
    --error-color: #d32f2f;
    --success-color: #388e3c;
    --border-radius: 8px;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: #333;
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 30px;
}

h1 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 30px;
    font-weight: 600;
}

.tabs {
    display: flex;
    margin-bottom: 20px;
    border-bottom: 2px solid #eee;
}

.tab-btn {
    background: none;
    border: none;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    outline: none;
    position: relative;
    color: #777;
}

.tab-btn.active {
    color: var(--primary-color);
    font-weight: 600;
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
}

.tab-content {
    margin-bottom: 20px;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

.input-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

textarea, input[type="text"] {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 14px;
    transition: border-color 0.3s, background-color 0.3s;
    background-color: #fafafa;
}

textarea {
    height: 120px;
    resize: vertical;
}

textarea:focus, input[type="text"]:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 2px rgba(74, 109, 167, 0.2);
}

textarea:disabled, input[type="text"]:disabled {
    background-color: #f2f2f2;
    color: #888;
    cursor: not-allowed;
    border-color: #ddd;
}

.action-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 24px;
    font-size: 16px;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.3s;
    display: block;
    margin: 0 auto 20px;
    font-weight: 500;
}

.action-btn:hover {
    background-color: var(--secondary-color);
}

.action-btn-small {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 8px 16px;
    font-size: 14px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
    margin-right: 8px;
}

.action-btn-small:hover {
    background-color: var(--secondary-color);
}

.copy-btn {
    background-color: #eee;
    border: none;
    border-radius: 4px;
    padding: 6px 12px;
    font-size: 14px;
    cursor: pointer;
    margin-top: 8px;
    transition: background-color 0.3s;
}

.copy-btn:hover {
    background-color: #ddd;
}

.result-actions {
    display: flex;
    margin-top: 10px;
}

#error-container {
    display: flex;
    align-items: center;
    background-color: #ffebee;
    border-left: 4px solid var(--error-color);
    padding: 12px 16px;
    margin-top: 20px;
    border-radius: 4px;
}

#error-container.hidden {
    display: none;
}

.error-icon {
    width: 24px;
    height: 24px;
    fill: var(--error-color);
    margin-right: 12px;
    flex-shrink: 0;
}

#error-message {
    color: var(--error-color);
    font-size: 14px;
}

.file-upload-container {
    margin-top: 10px;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
}

.file-upload-btn {
    display: inline-block;
    background-color: #eee;
    color: #555;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.3s;
}

.file-upload-btn:hover {
    background-color: #ddd;
}

.file-input {
    display: none;
}

.filename-display {
    margin-left: 10px;
    font-size: 14px;
    color: #666;
    word-break: break-all;
    max-width: 250px;
    display: inline-block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.clear-file-btn {
    display: inline-block;
    background-color: #e57373;
    color: white;
    border: none;
    border-radius: 4px;
    padding: 8px 16px;
    margin-left: 10px;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.clear-file-btn:hover {
    background-color: #ef5350;
}

.clear-file-btn.hidden {
    display: none;
}

@media (max-width: 600px) {
    .container {
        padding: 20px;
    }
    
    .tab-btn {
        padding: 8px 12px;
        font-size: 14px;
    }
    
    .action-btn {
        padding: 10px 20px;
        font-size: 14px;
    }
    
    .file-upload-container {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .filename-display {
        margin-left: 0;
        margin-top: 5px;
        max-width: 100%;
    }
    
    .clear-file-btn {
        margin-left: 0;
        margin-top: 5px;
    }
}