:root {
    --primary-color: #FF4B4B;
    --background-color: #FFFFFF;
    --secondary-background: #F0F2F6;
    --text-color: #262730;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: var(--background-color);
    color: var(--text-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

h1 {
    font-size: 2.5em;
    margin-bottom: 20px;
}

.description {
    font-size: 1.1em;
    margin-bottom: 30px;
}

.upload-section {
    margin: 30px 0;
    text-align: center;
}

.file-upload-label {
    display: inline-block;
    padding: 12px 24px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.file-upload-label:hover {
    background-color: #ff3333;
}

.file-type-hint {
    display: block;
    font-size: 0.8em;
    margin-top: 5px;
}

#fileUpload {
    display: none;
}

.grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-bottom: 20px;
    width: 100%;
}

.column {
    background-color: var(--secondary-background);
    padding: 15px;
    border-radius: 5px;
    width: 100%;
    box-sizing: border-box;
}

.content-box {
    background: white;
    padding: 10px;
    border-radius: 4px;
    max-height: 400px;
    max-width: 100%;
    margin: 0 auto;
    overflow-y: auto;
    overflow-x: auto;
    white-space: pre-wrap;
    font-family: monospace;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Loading Spinner */
.spinner {
    display: none;
    width: 50px;
    height: 50px;
    margin: 20px auto;
    border: 3px solid var(--secondary-background);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Progress Bar */
.progress-container {
    display: none;
    width: 100%;
    max-width: 300px;
    margin: 20px auto;
    background-color: var(--secondary-background);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    width: 0%;
    height: 4px;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading-text {
    display: none;
    text-align: center;
    color: var(--text-color);
    margin: 10px 0;
    font-style: italic;
}

.download-button {
    display: block;
    margin: 20px auto;
    padding: 12px 24px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    transition: background-color 0.3s;
}

.download-button:hover {
    background-color: #ff3333;
}

.instructions {
    margin-top: 30px;
    background-color: var(--secondary-background);
    padding: 20px;
    border-radius: 5px;
}

details summary {
    cursor: pointer;
    padding: 10px 0;
    font-weight: bold;
}

details ol {
    margin-top: 10px;
}

details li {
    margin-bottom: 10px;
}