* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    color: #333;
    line-height: 1.6;
    padding: 20px;
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    padding: 30px;
    margin-top: 40px;
}

h1 {
    text-align: center;
    color: #2575fc;
    margin-bottom: 25px;
    font-weight: 600;
}

.description {
    text-align: center;
    margin-bottom: 30px;
    color: #555;
    font-size: 1.1rem;
}

.example {
    background-color: #f0f8ff;
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 25px;
    border-left: 4px solid #2575fc;
}

.example h3 {
    margin-bottom: 10px;
    color: #2575fc;
}

.upload-area {
    border: 2px dashed #2575fc;
    border-radius: 10px;
    padding: 40px 20px;
    text-align: center;
    margin-bottom: 30px;
    transition: all 0.3s;
    background-color: #f9f9f9;
    cursor: pointer;
}

.upload-area:hover {
    background-color: #f0f8ff;
    border-color: #6a11cb;
}

.upload-area i {
    font-size: 48px;
    color: #2575fc;
    margin-bottom: 15px;
}

.upload-area p {
    margin-bottom: 15px;
    color: #666;
}

.btn {
    display: inline-block;
    background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 50px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(106, 17, 203, 0.3);
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(106, 17, 203, 0.4);
}

.btn:active {
    transform: translateY(1px);
}

.btn:disabled {
    background: #cccccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.result-area {
    margin-top: 30px;
    display: none;
}

.result-area h2 {
    color: #2575fc;
    margin-bottom: 15px;
}

.preview {
    background-color: #f5f5f5;
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 20px;
    max-height: 200px;
    overflow-y: auto;
    font-family: monospace;
    white-space: pre-wrap;
}

.download-btn {
    display: block;
    width: 100%;
    text-align: center;
    margin-top: 20px;
}

.file-info {
    margin-top: 15px;
    color: #666;
    font-size: 0.9rem;
}

footer {
    text-align: center;
    margin-top: 40px;
    color: white;
    font-size: 0.9rem;
}

.loading {
    display: none;
    text-align: center;
    margin: 20px 0;
}

.spinner {
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top: 4px solid #2575fc;
    width: 30px;
    height: 30px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error-message {
    background-color: #ffe6e6;
    color: #d63031;
    padding: 12px;
    border-radius: 8px;
    margin-top: 15px;
    display: none;
}