/* CSS Variables - Enhanced Color Scheme */
:root {
    /* Light mode colors */
    --primary-color: #2196F3;
    --primary-dark: #1976D2;
    --secondary-color: #4CAF50;
    --secondary-dark: #388E3C;
    --text-color: #333333;
    --text-light: #757575;
    --bg-color: #ffffff;
    --card-bg: #f9f9f9;
    --border-color: #e0e0e0;
    --border-radius: 8px;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    
    /* Status colors */
    --warning-bg-color: #fff3cd;
    --warning-border-color: #ffeeba;
    --warning-text: #856404;
    --success-bg-color: #d4edda;
    --success-border-color: #c3e6cb;
    --success-text: #155724;
    --error-bg-color: #f8d7da;
    --error-border-color: #f5c6cb;
    --error-text: #721c24;
    
    /* Transitions */
    --transition-speed: 0.3s;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 4px;
    --spacing-md: 8px;
    --spacing-lg: 12px;
    --spacing-xl: 24px;

    /* Improved focus indicators for accessibility */
    --focus-outline-color: rgba(33, 150, 243, 0.5);
    --focus-outline-width: 3px;
    
    /* Animation durations */
    --animation-speed-fast: 150ms;
    --animation-speed-normal: 300ms;
    --animation-speed-slow: 500ms;
}

/* Base styling */
body {
    font-family: 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color var(--transition-speed), color var(--transition-speed);
    line-height: 1.6;
}

/* Improved focus styles for accessibility */
:focus {
    outline: var(--focus-outline-width) solid var(--focus-outline-color);
    outline-offset: 2px;
}

:focus:not(:focus-visible) {
    outline: none;
}

:focus-visible {
    outline: var(--focus-outline-width) solid var(--focus-outline-color);
    outline-offset: 2px;
}

h1 {
    margin: 0 0 var(--spacing-md) 0;
    font-weight: 600;
    font-size: 32px;
    color: var(--primary-color);
}

h2 {
    color: var(--text-color);
    display: flex;
    align-items: baseline;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

h2 .description {
    font-size: 14px;
    font-weight: normal;
    font-family: 'Courier New', monospace;
    color: var(--text-light);
}

/* Beta warning */
.beta-warning {
    background-color: var(--warning-bg-color);
    color: var(--warning-text);
    text-align: center;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    border-radius: var(--border-radius);
    font-weight: 500;
    border: 1px solid var(--warning-border-color);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.beta-warning::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background-color: #ff9800;
}

.beta-warning a {
    color: var(--primary-color);
    text-decoration: underline;
    font-weight: bold;
    transition: color var(--transition-speed);
}

.beta-warning a:hover {
    color: var(--primary-dark);
    text-decoration: none;
}

/* Converter container */
.converter {
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
    margin: var(--spacing-sm) 0;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: border-color var(--transition-speed), background-color var(--transition-speed), 
                transform var(--animation-speed-normal);
}

.converter.dragover {
    border-color: var(--primary-color);
    background-color: rgba(33, 150, 243, 0.05);
    transform: scale(1.005);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

/* Shimmering animation for drop indication */
@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

.converter.dragover::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        rgba(255,255,255,0) 0%, 
        rgba(255,255,255,0.4) 50%, 
        rgba(255,255,255,0) 100%);
    background-size: 1000px 100%;
    animation: shimmer 2s infinite linear;
    pointer-events: none;
    z-index: 1;
}

/* Table layout */
.content-table {
    width: 100%;
    border-collapse: collapse;
    table-layout: fixed;
}

.content-table td {
    vertical-align: top;
    padding: 0 var(--spacing-md);
}

.program-col {
    width: 35%;
}

.pc-col {
    width: 30%;
}

.raw-col {
    width: 35%;
}

/* Textarea and line numbers */
.textarea-container {
    display: flex;
    width: 100%;
    margin: var(--spacing-md) 0;
    box-sizing: border-box;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: box-shadow var(--transition-speed), transform var(--animation-speed-normal);
    position: relative;
}

.textarea-container:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.textarea-container:focus-within {
    box-shadow: 0 4px 15px rgba(33, 150, 243, 0.2);
    transform: translateY(-2px);
}

.line-numbers {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    width: 30px;
    height: 100%;
    padding: 8px 5px;
    background: var(--bg-light);
    border-right: 1px solid var(--border-color);
    overflow: hidden;
    text-align: right;
    font-family: monospace;
    font-size: 13px;
    line-height: 14px;
    user-select: none;
    color: var(--text-light);
}

.textarea-container textarea {
    flex: 1;
    margin: 0;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.5;
    padding: 9px;
    border: 1px solid var(--border-color);
    border-left: none;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    white-space: pre;
    overflow-wrap: normal;
    overflow-x: auto;
    overflow-y: scroll;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.content-textarea {
    width: 100%;
    height: 100%;
    padding: 8px;
    border: none;
    outline: none;
    background: transparent;
    resize: none;
    font-family: monospace;
    font-size: 13px;
    line-height: 14px;
    min-height: 300px;
    height: 300px;
    resize: vertical;
    box-sizing: border-box;
    font-family: 'Courier New', monospace;
}

/* Add a class for smooth height transitions */
.synchronized-height {
    transition: height 0.2s ease-out;
}

/* General textarea styling (for non-content textareas) */
textarea {
    width: 100%;
    min-height: 200px;
    margin: var(--spacing-md) 0;
    font-family: 'Courier New', monospace;
    padding: 9px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    line-height: 1.2;
    tab-size: 4;
    box-sizing: border-box;
    background-color: var(--bg-color);
    color: var(--text-color);
}

/* Section headers */
.section-header {
    margin-top: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    padding: 0;
    font-size: 18px;
    font-weight: 600;
    color: var(--primary-color);
    position: relative;
    display: inline-block;
}

.section-header::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 30px;
    height: 2px;
    background-color: var(--primary-color);
    transition: width var(--transition-speed);
}

.section-header:hover::after {
    width: 100%;
}

/* Button styling */
button {
    padding: 10px 20px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 500;
    transition: background-color var(--transition-speed), transform var(--transition-speed), 
                box-shadow var(--transition-speed);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
}

button:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

button:active {
    transform: translateY(0);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

/* Ripple effect */
button::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 5px;
    height: 5px;
    background: rgba(255, 255, 255, 0.5);
    opacity: 0;
    border-radius: 100%;
    transform: scale(1, 1) translate(-50%, -50%);
    transform-origin: 50% 50%;
}

button:active::after {
    animation: ripple 1s ease-out;
}

@keyframes ripple {
    0% {
        transform: scale(0, 0) translate(-50%, -50%);
        opacity: 0.5;
    }
    100% {
        transform: scale(20, 20) translate(-50%, -50%);
        opacity: 0;
    }
}

.button-row {
    display: flex;
    justify-content: space-between;
    margin: var(--spacing-sm) 0;
    width: 100%;
}

.button-row-left {
    display: flex;
    gap: var(--spacing-sm);
}

.button-row-right {
    display: flex;
    gap: var(--spacing-sm);
    margin-left: auto;
}

.button-row button {
    padding: 8px 15px;
    border-radius: var(--border-radius);
    background-color: var(--primary-color);
    color: white;
    border: none;
    cursor: pointer;
    font-size: 14px;
}

.button-row button:last-child {
    background-color: var(--secondary-color);
}

.button-row button:last-child:hover {
    background-color: var(--secondary-dark);
}

/* Copy button - new feature */
.copy-btn {
    background-color: #757575;
}

.copy-btn:hover {
    background-color: #616161;
}

.copy-btn.success {
    background-color: var(--secondary-color);
}

/* Status messages */
.status {
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
    border-radius: var(--border-radius);
    display: none;
    font-weight: 500;
    box-shadow: var(--shadow);
    position: relative;
    padding-left: calc(var(--spacing-md) + 24px);
}

.status::before {
    content: '';
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
}

.status.success {
    background-color: var(--success-bg-color);
    color: var(--success-text);
    border: 1px solid var(--success-border-color);
}

.status.success::before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23155724'%3E%3Cpath d='M0 0h24v24H0z' fill='none'/%3E%3Cpath d='M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z'/%3E%3C/svg%3E");
}

.status.error {
    background-color: var(--error-bg-color);
    color: var(--error-text);
    border: 1px solid var(--error-border-color);
}

.status.error::before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23721c24'%3E%3Cpath d='M0 0h24v24H0z' fill='none'/%3E%3Cpath d='M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm1 15h-2v-2h2v2zm0-4h-2V7h2v6z'/%3E%3C/svg%3E");
}

/* Animation for status messages */
@keyframes statusSlideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.status[style*="display: block"] {
    animation: statusSlideIn 0.3s ease-out forwards;
}

/* Help icon */
.help-icon {
    display: inline-block;
    width: 20px;
    height: 20px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    text-align: center;
    line-height: 20px;
    font-weight: bold;
    font-size: 12px;
    cursor: help;
    margin-left: var(--spacing-sm);
    position: relative;
    transition: background-color var(--transition-speed), transform var(--transition-speed);
}

.help-icon:hover {
    background-color: var(--primary-dark);
    transform: scale(1.1);
}

.help-icon .tooltip {
    visibility: hidden;
    width: 250px;
    background-color: var(--card-bg);
    color: var(--text-color);
    text-align: left;
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    position: absolute;
    z-index: 10;
    bottom: 125%;
    left: 50%;
    margin-left: -125px;
    opacity: 0;
    transition: opacity var(--transition-speed), transform var(--transition-speed);
    font-weight: normal;
    font-size: 12px;
    line-height: 1.4;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transform: translateY(10px);
}

.help-icon:hover .tooltip {
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
}

/* File section */
.file-section {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm);
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.file-section .help-icon {
    order: 2;
    margin: 0;
}

.file-section .browse-btn {
    order: 1;
    margin-right: auto;
}

.file-input {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

.browse-btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 8px 16px;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.3s, transform 0.3s, box-shadow 0.3s;
    border: none;
    font-weight: 500;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.browse-btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

/* Debug section */
.debug-section {
    margin-top: 20px;
}

#debug {
    width: 100%;
    height: 100px;
    background-color: #f5f5f5;
    border: 1px solid #ddd;
    padding: 10px;
    font-family: monospace;
    margin-bottom: 10px;
    resize: vertical;
    display: none; /* Hide only the textarea by default */
}

.debug-header {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 10px;
}

.debug-toggle {
    padding: 5px 10px;
    background-color: var(--text-light);
    color: white;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    font-size: 12px;
}

.debug-toggle:hover {
    background-color: var(--text-color);
}

.command-line {
    font-family: 'Courier New', monospace;
    background-color: var(--code-bg);
    color: var(--code-text);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: 0.85em;
    margin-top: 5px;
    white-space: nowrap;
    overflow-x: auto;
    display: none; /* Hide by default - will be shown when debug is toggled on */
}

/* Responsive design */
@media (max-width: 1024px) {
    .content-table {
        display: block;
    }
    
    .content-table tr, 
    .content-table td {
        display: block;
        width: 100%;
        padding: var(--spacing-sm) 0;
    }
    
    .program-col,
    .pc-col,
    .raw-col {
        width: 100%;
    }
}

/* Loading animation for buttons */
.loading-spinner {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
    margin-right: 10px;
    vertical-align: middle;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Add modern loading state animations */
@keyframes shimmer-loading {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

/* Add shimmer effect to loading elements */
.loading-shimmer {
    position: relative;
    overflow: hidden;
}

.loading-shimmer::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(255, 255, 255, 0.3) 50%, 
        transparent 100%);
    background-size: 200% 100%;
    animation: shimmer-loading 1.5s infinite;
    z-index: 1;
}

/* Modern focus effect for interactive elements */
.focus-ring:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--focus-outline-color), 0 0 0 6px rgba(255, 255, 255, 0.8);
    transition: box-shadow 0.2s ease-in-out;
}

/* Add smooth enter/exit animations */
.fade-enter {
    opacity: 0;
    transform: translateY(10px);
}

.fade-enter-active {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 300ms, transform 300ms;
}

.fade-exit {
    opacity: 1;
    transform: translateY(0);
}

.fade-exit-active {
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 300ms, transform 300ms;
}

/* Improved loading animation for buttons */
.button-with-spinner {
    display: flex;
    align-items: center;
    justify-content: center;
}

button.loading .button-text {
    visibility: hidden;
    position: relative;
}

button.loading .button-text:after {
    visibility: visible;
    position: absolute;
    content: '';
    top: 50%;
    left: 50%;
    margin: -0.64em 0 0 -0.64em;
    border-radius: 50%;
    width: 1.28em;
    height: 1.28em;
    border: 2px solid rgba(255, 255, 255, 0.25);
    border-top-color: #ffffff;
    animation: spin 1s infinite linear;
}

/* Tooltip */
.tooltip-container {
    position: relative;
    display: inline-block;
}

.tooltip-text {
    visibility: hidden;
    width: 200px;
    background-color: var(--card-bg);
    color: var(--text-color);
    text-align: center;
    border-radius: var(--border-radius);
    padding: var(--spacing-sm);
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -100px;
    opacity: 0;
    transition: opacity 0.3s, transform 0.3s;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    font-size: 12px;
    transform: translateY(10px);
}

.tooltip-container:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
}

/* File upload styles */
.file-upload-container {
    margin: var(--spacing-md) 0;
}

/* .file-upload-header {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.file-upload-header h3 {
    margin: 0;
    margin-right: auto;
} */

.file-name {
    padding: var(--spacing-sm);
    background-color: rgba(33, 150, 243, 0.1);
    border-radius: var(--border-radius);
    font-size: 14px;
    color: var(--text-color);
    word-break: break-all;
    margin-top: 0;
    position: relative;
    overflow: hidden;
}

/* Progressive loading effect */
@keyframes progressiveLoading {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

.loading-element {
    position: relative;
}

.loading-element::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(255, 255, 255, 0.6) 50%, 
        transparent 100%);
    background-size: 200% 100%;
    animation: progressiveLoading 1.5s infinite;
    z-index: 1;
}

/* Utility classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.elevation-1 { box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1); }
.elevation-2 { box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15); }
.elevation-3 { box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2); }

.rounded { border-radius: var(--border-radius); }
.rounded-lg { border-radius: calc(var(--border-radius) * 2); }
.rounded-full { border-radius: 9999px; }

.transition { transition: all var(--transition-speed); }
.fade-in { animation: fadeIn var(--animation-speed-normal) ease-in; }

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Accessibility utilities */
.visually-hidden {
    border: 0;
    clip: rect(0 0 0 0);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute;
    width: 1px;
}

/* Features section */
.features-section {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-md);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.feature-card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    box-shadow: var(--shadow);
    transition: transform var(--animation-speed-normal), box-shadow var(--animation-speed-normal);
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 36px;
    margin-bottom: var(--spacing-sm);
}

.feature-card h3 {
    color: var(--primary-color);
    margin: var(--spacing-sm) 0;
}

.feature-card p {
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.5;
}

/* Debug section styling */
.debug-section {
    margin-top: 20px;
}

/* Keyboard shortcuts */
.keyboard-shortcuts {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.keyboard-shortcuts h3 {
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: var(--spacing-sm);
}

.shortcuts-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.shortcuts-list li {
    margin: var(--spacing-sm) 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

kbd {
    background-color: #f7f7f7;
    border: 1px solid #ccc;
    border-radius: 3px;
    box-shadow: 0 1px 1px rgba(0,0,0,.2), 0 2px 0 0 rgba(255,255,255,.7) inset;
    color: #333;
    display: inline-block;
    font-size: .85em;
    font-weight: 700;
    line-height: 1;
    padding: 2px 6px;
    white-space: nowrap;
}

/* Footer styling */
footer {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    text-align: center;
    color: var(--text-light);
    font-size: 14px;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-speed);
}

footer a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* Responsive adjustments for features grid */
@media (max-width: 768px) {
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .feature-card {
        max-width: 100%;
    }
}

/* Keyboard shortcut activation effect */
.shortcut-activated {
    animation: pulse 0.3s ease-in-out;
}

@keyframes pulse {
    0% {
        transform: scale(1);
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    }
    50% {
        transform: scale(1.1);
        box-shadow: 0 4px 10px rgba(33, 150, 243, 0.3);
    }
    100% {
        transform: scale(1);
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    }
}

/* Feature showcase section */
.feature-showcase {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
    margin-top: var(--spacing-lg);
    border: 1px solid var(--border-color);
}

.showcase-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
}

.showcase-item {
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    background-color: var(--bg-color);
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform var(--animation-speed-normal), box-shadow var(--animation-speed-normal);
}

.showcase-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.showcase-icon {
    font-size: 32px;
    margin-bottom: var(--spacing-sm);
}

.showcase-item h4 {
    color: var(--primary-color);
    margin: var(--spacing-sm) 0;
    font-size: 16px;
}

.showcase-item p {
    color: var(--text-light);
    font-size: 13px;
    line-height: 1.4;
}

@media (max-width: 992px) {
    .showcase-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .showcase-grid {
        grid-template-columns: 1fr;
    }
}

/* Add smooth scrolling behavior */
html {
    scroll-behavior: smooth;
}

/* Add modern variable font loading */
@supports (font-variation-settings: normal) {
    body {
        font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI Variable', 'Segoe UI', 
                     Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
        font-feature-settings: "liga" 1, "calt" 1;  /* Enable standard ligatures and contextual alternates */
    }
}

/* Add backdrop filter for modal elements */
.modal-overlay {
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

/* Add smooth button interaction effects */
button {
    transition: transform 0.2s, box-shadow 0.2s, background-color 0.2s, filter 0.2s;
}

button:hover {
    filter: brightness(1.05);
}

button:active {
    transform: translateY(1px);
    filter: brightness(0.95);
}

/* Add reduced motion preference support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Add styles for keyboard focus */
.keyboard-focus {
    outline: 3px solid var(--focus-outline-color) !important;
    outline-offset: 2px !important;
    box-shadow: 0 0 8px rgba(33, 150, 243, 0.5) !important;
    transition: outline 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
    z-index: 2;
    position: relative;
}

/* Add styles for shortcut-activated elements */
.shortcut-activated {
    animation: pulse 0.3s ease-in-out;
}

/* Improved focus states for all interactive elements */
button:focus-visible,
textarea:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 3px solid var(--focus-outline-color);
    outline-offset: 2px;
    box-shadow: 0 0 8px rgba(33, 150, 243, 0.5);
    position: relative;
    z-index: 2;
}

/* Accessibility skip link for keyboard navigation */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: #ffffff;
    color: #000000;
    padding: 10px;
    z-index: 1000;
    transition: top 0.3s ease;
}

.skip-link:focus {
    top: 0;
}

@media (prefers-reduced-motion: reduce) {
    .keyboard-focus,
    .keyboard-focus * {
        transition-duration: 0.001ms !important;
        animation-duration: 0.001ms !important;
    }
}

/* Debug section */
.debug-section {
    margin-top: 20px;
}

#debug {
    width: 100%;
    height: 100px;
    background-color: #f5f5f5;
    border: 1px solid #ddd;
    padding: 10px;
    font-family: monospace;
    margin-bottom: 10px;
    resize: vertical;
}

/* File name display */
.file-name {
    padding: var(--spacing-sm);
    background-color: rgba(33, 150, 243, 0.1);
    border-radius: var(--border-radius);
    font-size: 14px;
    color: var(--text-color);
    word-break: break-all;
    margin-top: 0;
    position: relative;
    overflow: hidden;
}

/* Modal/Popup styles */
.popup {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-speed), visibility var(--transition-speed);
}

.popup:not(.hidden) {
    opacity: 1;
    visibility: visible;
}

.popup-content {
    background-color: var(--bg-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    overflow-y: auto;
    transform: translateY(-20px);
    opacity: 0;
    transition: transform var(--transition-speed), opacity var(--transition-speed);
}

.popup:not(.hidden) .popup-content {
    transform: translateY(0);
    opacity: 1;
}

.popup-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.popup-header h2 {
    margin: 0;
    color: var(--primary-color);
    font-size: 1.5rem;
}

.popup-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
    max-height: 70vh;
}

/* Close button */
.close-btn {
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-light);
    transition: color var(--transition-speed);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
}

.close-btn:hover {
    color: var(--text-color);
    background-color: rgba(0, 0, 0, 0.1);
}

/* Action header in popups */
.actionheader {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

/* Styles for popup content */
.popup-body p {
    margin: var(--spacing-md) 0;
}

.popup-body tt {
    background-color: var(--card-bg);
    padding: 2px 4px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
}

/* Tables in popups */
.equivalents {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-md) 0;
}

.equivalents th, .equivalents td {
    border: 1px solid var(--border-color);
    padding: var(--spacing-sm);
}

.equivalents th {
    background-color: var(--card-bg);
    font-weight: 600;
    text-align: left;
}

/* Version history list */
.history-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--border-color);
}

.history-details h3 {
    margin: 0 0 var(--spacing-xs) 0;
    font-size: 1rem;
    color: var(--text-color);
}

.history-details p {
    margin: 0;
    color: var(--text-light);
    font-size: 0.9rem;
}

.history-date {
    font-family: 'Courier New', monospace;
    color: var(--text-light);
    font-size: 0.9rem;
    background-color: var(--card-bg);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
}

/* Responsive adjustments for popups */
@media (max-width: 768px) {
    .popup-content {
        width: 95%;
        max-width: none;
    }
    
    .popup-header {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .popup-body {
        padding: var(--spacing-md);
    }
    
    .history-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .history-date {
        margin-top: var(--spacing-xs);
    }
}

/* Notification */
.notification {
    position: fixed;
    bottom: 20px;
    right: 20px;
    min-width: 300px;
    max-width: 400px;
    background-color: var(--success-bg-color);
    color: var(--success-text);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    z-index: 1000;
    overflow: hidden;
    transform: translateY(100px);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-speed), opacity var(--transition-speed), visibility var(--transition-speed);
}

.notification.hidden {
    transform: translateY(100px);
    opacity: 0;
    visibility: hidden;
}

.notification:not(.hidden) {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
}

.notification-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
}

.notification-progress {
    width: 100%;
    height: 4px;
    background-color: rgba(255, 255, 255, 0.3);
}

#progressBar {
    height: 100%;
    width: 0;
    background-color: rgba(255, 255, 255, 0.6);
    transition: width linear;
}

/* Notification types */
.notification.success {
    background-color: var(--success-bg-color);
    color: var(--success-text);
    border: 1px solid var(--success-border-color);
}

.notification.error {
    background-color: var(--error-bg-color);
    color: var(--error-text);
    border: 1px solid var(--error-border-color);
}

.notification.info {
    background-color: var(--primary-color);
    color: white;
    border: 1px solid var(--primary-dark);
}

@media (max-width: 768px) {
    .notification {
        left: 20px;
        right: 20px;
        min-width: unset;
        max-width: unset;
    }
}

/* Main content area */
#main-content {
    background-color: var(--bg-color);
    /* padding: var(--spacing-md); */
    padding: 0;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    margin-bottom: var(--spacing-lg);
    overflow-x: auto;
    max-width: 100%;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

/* Status message */
.status-message {
    margin: var(--spacing-md) 0;
    padding: var(--spacing-sm);
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    color: var(--text-light);
    font-size: 0.9rem;
}

/* File operations */
.file-operations {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
    align-items: center;
    flex-wrap: wrap;
}

input[type="file"] {
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-sm);
}

/* Drop message */
.drop-message {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(33, 150, 243, 0.9);
    color: white;
    font-size: 1.5rem;
    font-weight: 600;
    z-index: 5;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-speed), visibility var(--transition-speed);
    border-radius: var(--border-radius);
}

.converter.dragover .drop-message {
    opacity: 1;
    visibility: visible;
}

/* Media query for button rows on mobile devices */
@media (max-width: 768px) {
    .button-row {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .button-row-left,
    .button-row-right {
        width: 100%;
        justify-content: space-between;
    }
}