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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: #f0f2f5;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.upload-section {
    text-align: center;
    padding: 40px;
    border: 2px dashed #ccc;
    border-radius: 8px;
    margin-bottom: 20px;
}

.upload-section.drag-over {
    background-color: #f8f9fa;
    border-color: #0066cc;
}

.file-input-wrapper {
    margin: 20px 0;
}

.file-input {
    display: none;
}

.file-input-label {
    background-color: #0066cc;
    color: white;
    padding: 12px 24px;
    border-radius: 6px;
    cursor: pointer;
    display: inline-block;
    transition: background-color 0.2s;
}

.file-input-label:hover {
    background-color: #0052a3;
}

.viewer-container {
    width: 100%;
    min-height: 600px;
    border: 1px solid #ddd;
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

#viewer {
    width: 100%;
    height: 100%;
    min-height: 600px;
    border: none;
}

.loading {
    display: none;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.loading-spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #0066cc;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 10px;
}

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

    100% {
        transform: rotate(360deg);
    }
}

.error-message {
    display: none;
    color: #dc3545;
    text-align: center;
    padding: 20px;
}