:root {
    --primary-color: #4a6fa5;
    --secondary-color: #6b8cae;
    --accent-color: #ff7e5f;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --success-color: #28a745;
    --error-color: #dc3545;
}

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

body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    background-color: #f5f5f5;
    color: #333;
    padding: 20px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

header p {
    color: var(--secondary-color);
}

.tabs {
    display: flex;
    margin-bottom: 20px;
    border-bottom: 1px solid #ddd;
}

.tab-btn {
    padding: 10px 20px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 16px;
    color: var(--secondary-color);
    transition: all 0.3s;
    border-bottom: 3px solid transparent;
}

.tab-btn:hover {
    color: var(--primary-color);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom: 3px solid var(--accent-color);
    font-weight: 500;
}

.tab-content {
    display: none;
    padding: 20px 0;
}

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

.upload-area {
    margin-bottom: 20px;
    padding: 20px;
    border: 2px dashed #ddd;
    border-radius: 5px;
    text-align: center;
    transition: all 0.3s;
}

.upload-area:hover {
    border-color: var(--primary-color);
}

.upload-area input[type="file"] {
    display: none;
}

.upload-area label {
    display: block;
    padding: 10px;
    background-color: var(--light-color);
    color: var(--dark-color);
    border-radius: 5px;
    cursor: pointer;
    margin-bottom: 15px;
    transition: all 0.3s;
}

.upload-area label:hover {
    background-color: #e9ecef;
}

textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    resize: vertical;
    min-height: 100px;
    margin-bottom: 15px;
    font-family: inherit;
}

.language-select {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 15px;
}

.language-select select {
    padding: 8px;
    border-radius: 5px;
    border: 1px solid #ddd;
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    transition: all 0.3s;
}

button:hover {
    background-color: var(--secondary-color);
}

.result-area {
    padding: 20px;
    border-radius: 5px;
    background-color: var(--light-color);
    margin-top: 20px;
    min-height: 100px;
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
    margin-right: 10px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .tabs {
        flex-wrap: wrap;
    }
    
    .tab-btn {
        flex: 1 0 50%;
    }
}