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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    max-width: 600px;
    width: 100%;
}

h1 {
    color: #333;
    margin-bottom: 30px;
    text-align: center;
}

.description-section {
    background: linear-gradient(135deg, #667eea15 0%, #764ba215 100%);
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid #667eea;
    margin-bottom: 35px;
}

.description-box h2 {
    color: #667eea;
    font-size: 20px;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.description-box p {
    color: #555;
    line-height: 1.6;
    margin-bottom: 12px;
    font-size: 15px;
}

.description-box p strong {
    color: #333;
    font-weight: 600;
}

.section {
    margin-bottom: 30px;
}

.section-title {
    color: #667eea;
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
}

.section-title::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 4px;
    background: #667eea;
    border-radius: 50%;
    margin-right: 10px;
}

.param-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.param-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.param-group label {
    color: #555;
    font-size: 14px;
    font-weight: 600;
}

.param-select {
    padding: 10px 12px;
    border: 2px solid #e0e0e0;
    border-radius: 5px;
    font-size: 14px;
    color: #333;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.param-select:hover {
    border-color: #667eea;
}

.param-select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.file-input-wrapper {
    position: relative;
    display: inline-block;
    width: 100%;
}

input[type="file"] {
    display: none;
}

.file-input-label {
    display: block;
    padding: 15px 20px;
    background: #f0f0f0;
    border: 2px dashed #667eea;
    border-radius: 5px;
    cursor: pointer;
    text-align: center;
    transition: all 0.3s ease;
    color: #666;
}

.file-input-label:hover {
    background: #e8e8ff;
    border-color: #764ba2;
}

.file-input-label.dragover {
    background: #e0e0ff;
    border-color: #764ba2;
}

#fileInfo {
    margin-top: 15px;
    padding: 12px;
    background: #f5f5f5;
    border-radius: 5px;
    display: none;
    color: #666;
    font-size: 14px;
}

#fileInfo.show {
    display: block;
}

.button-group {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

button {
    padding: 12px 24px;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    flex: 1;
}

.btn-process {
    background: #667eea;
    color: white;
}

.btn-process:hover:not(:disabled) {
    background: #764ba2;
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

.btn-process:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.btn-download {
    background: #48bb78;
    color: white;
}

.btn-download:hover:not(:disabled) {
    background: #38a169;
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(72, 187, 120, 0.4);
}

.btn-download:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.btn-reset {
    background: #f56565;
    color: white;
}

.btn-reset:hover {
    background: #e53e3e;
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(245, 101, 101, 0.4);
}

.status-message {
    margin-top: 15px;
    padding: 12px;
    border-radius: 5px;
    display: none;
    font-size: 14px;
}

.status-message.show {
    display: block;
}

.status-message.success {
    background: #c6f6d5;
    color: #22543d;
    border: 1px solid #9ae6b4;
}

.status-message.error {
    background: #fed7d7;
    color: #742a2a;
    border: 1px solid #fc8181;
}

.status-message.info {
    background: #bee3f8;
    color: #2c5282;
    border: 1px solid #90cdf4;
}