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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 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;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 40px;
    max-width: 500px;
    width: 100%;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 8px;
    font-size: 28px;
}

.subtitle {
    text-align: center;
    color: #666;
    margin-bottom: 30px;
    font-size: 14px;
}

.upload-section {
    margin-bottom: 30px;
}

.file-input-wrapper {
    position: relative;
    margin-bottom: 20px;
}

#fileInput {
    display: none;
}

.file-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 20px;
    border: 2px dashed #ddd;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    background: #f8f9fa;
}

.file-label:hover {
    border-color: #667eea;
    background: #f0f4ff;
}

.file-icon {
    font-size: 24px;
}

.file-text {
    color: #666;
    font-size: 14px;
}

.files-list {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    margin-bottom: 15px;
    background: #f8f9fa;
}

.files-list-header {
    padding: 10px 12px;
    background: #667eea;
    color: white;
    font-size: 13px;
    font-weight: 600;
    border-radius: 8px 8px 0 0;
}

.file-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-bottom: 1px solid #e9ecef;
    transition: background 0.2s ease;
}

.file-item:last-child {
    border-bottom: none;
}

.file-item:hover {
    background: #e9ecef;
}

.file-item-name {
    flex: 1;
    font-size: 13px;
    color: #333;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-item-size {
    font-size: 12px;
    color: #666;
    min-width: 50px;
    text-align: right;
}

.remove-file-btn {
    background: #dc3545;
    color: white;
    border: none;
    border-radius: 4px;
    width: 24px;
    height: 24px;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s ease;
}

.remove-file-btn:hover {
    background: #c82333;
}

.file-info {
    text-align: center;
    color: #333;
    font-size: 14px;
    margin-bottom: 20px;
    min-height: 20px;
}

.button-group {
    display: flex;
    gap: 12px;
}

.upload-btn {
    flex: 1;
    padding: 14px 24px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.upload-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.upload-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.cancel-btn {
    flex: 0 0 auto;
    padding: 14px 24px;
    background: #dc3545;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.cancel-btn:hover {
    background: #c82333;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(220, 53, 69, 0.4);
}

.progress-container {
    margin-top: 20px;
}

.progress-bar {
    height: 8px;
    background: #e0e0e0;
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 8px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    width: 0%;
    transition: width 0.3s ease;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 8px;
}

.progress-text {
    text-align: center;
    color: #666;
    font-size: 14px;
    flex: 1;
}

.progress-speed {
    text-align: center;
    color: #667eea;
    font-size: 14px;
    font-weight: 600;
}

.status-message {
    margin-top: 20px;
    padding: 12px;
    border-radius: 8px;
    text-align: center;
    font-size: 14px;
    display: none;
}

.status-message.success {
    display: block;
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.status-message.error {
    display: block;
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.info-section {
    border-top: 1px solid #eee;
    padding-top: 20px;
}

.info-section h3 {
    color: #333;
    font-size: 14px;
    margin-bottom: 12px;
}

.code-block {
    background: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    padding: 12px;
    overflow-x: auto;
}

.code-block code {
    color: #667eea;
    font-family: 'Courier New', monospace;
    font-size: 12px;
    word-break: break-all;
}