@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;700&display=swap');

:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --background-color: #ecf0f1;
    --text-color: #2c3e50;
    --secondary-text: #7f8c8d;
    --highlight-color: #3498db;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --diff-add-bg: rgba(46, 160, 67, 0.2);
    --diff-remove-bg: rgba(248, 81, 73, 0.2);
    --border-color: #bdc3c7;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

.dark-theme {
    --primary-color: #23272e;
    --secondary-color: #2c313a;
    --background-color: #181a20;
    --text-color: #e0e6ed;
    --secondary-text: #7f8c8d;
    --highlight-color: #2980b9;
    --success-color: #27ae60;
    --warning-color: #f1c40f;
    --danger-color: #e74c3c;
    --diff-add-bg: rgba(46, 160, 67, 0.25);
    --diff-remove-bg: rgba(248, 81, 73, 0.25);
    --border-color: #23272e;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.7);
}

.dark-theme body {
    background-color: var(--background-color);
    color: var(--text-color);
}

.dark-theme header {
    background: linear-gradient(135deg, #23272e, #2c313a);
    color: var(--text-color);
    border-bottom: 5px solid var(--highlight-color);
}

.dark-theme .file-container,
.dark-theme #diff-container,
.dark-theme .controls {
    background: var(--secondary-color);
    color: var(--text-color);
    box-shadow: var(--shadow);
}

.dark-theme .file-header {
    border-bottom: 2px solid var(--highlight-color);
}

.dark-theme .file-info-text,
.dark-theme .text-stats {
    color: #b2bec3;
}

.dark-theme .language-selector,
.dark-theme .file-container input[type="file"],
.dark-theme .file-container textarea {
    background: #23272e;
    color: var(--text-color);
    border-color: #23272e;
}

.dark-theme .file-container textarea:focus {
    border-color: var(--highlight-color);
    box-shadow: 0 0 0 3px rgba(41, 128, 185, 0.2);
}

.dark-theme .primary-btn,
.dark-theme .secondary-btn {
    background: #23272e;
    color: var(--text-color);
    border: 1px solid var(--highlight-color);
}

.dark-theme .primary-btn:hover,
.dark-theme .secondary-btn:hover {
    background: var(--highlight-color);
    color: #fff;
}

.dark-theme .diff-line-number {
    color: #b2bec3;
}

.dark-theme .diff-line.added {
    background-color: rgba(46, 160, 67, 0.18);
    border-left: 4px solid var(--success-color);
}

.dark-theme .diff-line.removed {
    background-color: rgba(248, 81, 73, 0.18);
    border-left: 4px solid var(--danger-color);
}

.dark-theme .intra-line-added {
    background-color: rgba(46, 160, 67, 0.4);
    border: 1px solid var(--success-color);
    color: #e0e6ed;
}

.dark-theme .intra-line-removed {
    background-color: rgba(248, 81, 73, 0.4);
    border: 1px solid var(--danger-color);
    color: #e0e6ed;
}

.dark-theme ::-webkit-scrollbar-thumb {
    background: #23272e;
}

.dark-theme ::-webkit-scrollbar-thumb:hover {
    background: var(--highlight-color);
}

.dark-theme .search-container input {
    background: #23272e;
    color: var(--text-color);
    border-color: #23272e;
}

.dark-theme .search-container input:focus {
    border-color: var(--highlight-color);
}

.dark-theme .diff-header {
    color: var(--text-color);
}

.dark-theme .side-header {
    color: var(--text-color);
}

.dark-theme .icon-btn {
    color: var(--text-color);
}

.dark-theme .icon-btn:hover {
    background: rgba(41, 128, 185, 0.2);
}

.dark-theme .loading-spinner {
    color: var(--text-color);
}

.dark-theme .search-results {
    background: #23272e;
    color: var(--text-color);
    border-color: var(--highlight-color);
}

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

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: var(--transition);
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--background-color);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--background-color);
    padding: 2rem;
    text-align: center;
    border-bottom: 5px solid var(--highlight-color);
    position: relative;
    box-shadow: var(--shadow);
}

.header-controls {
    position: absolute;
    top: 1rem;
    right: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.icon-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.icon-btn.small {
    padding: 0.25rem;
}

.icon-btn svg {
    stroke: currentColor;
}

.theme-switcher-container {
    display: flex;
    align-items: center;
}


header h1 {
    margin-bottom: 0.5rem;
    font-weight: 700;
}

main {
    padding: 2rem;
}

.container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
    align-items: stretch;
    /* Make columns equal height */
}

.file-container,
#diff-container {
    background: #fff;
    transition: background-color 0.4s ease, color 0.4s ease;
}

.dark-theme .file-container,
.dark-theme #diff-container {
    background: #34495e;
}

.file-container {
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    background: #fff;
    transition: var(--transition);
}

.dark-theme .file-container {
    background: var(--secondary-color);
}

.file-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--highlight-color);
    padding-bottom: 0.5rem;
}

.file-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.file-info-text {
    font-size: 0.8rem;
    color: var(--secondary-text);
}

.language-selector {
    padding: 0.25rem 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--background-color);
    color: var(--text-color);
    font-size: 0.8rem;
}

.dark-theme .language-selector {
    background: var(--primary-color);
    border-color: var(--secondary-color);
}

.file-container h2 {
    margin: 0;
    color: var(--text-color);
    font-weight: 600;
}

.file-container input[type="file"] {
    margin-bottom: 1rem;
    padding: 12px;
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    background: var(--background-color);
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-color);
    font-family: inherit;
}

.file-container input[type="file"]:hover,
.file-container.dragover input[type="file"] {
    border-color: var(--highlight-color);
    background: rgba(52, 152, 219, 0.1);
}

.file-container.dragover {
    border-color: var(--highlight-color);
    background: rgba(52, 152, 219, 0.05);
}

.file-container textarea {
    width: 100%;
    flex-grow: 1;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem;
    font-family: 'Fira Code', 'Monaco', 'Consolas', monospace;
    font-size: 14px;
    line-height: 1.5;
    resize: vertical;
    background: var(--background-color);
    color: var(--text-color);
    transition: var(--transition);
    min-height: 300px;
}

.file-container textarea:focus {
    outline: none;
    border-color: var(--highlight-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.dark-theme .file-container textarea {
    background: var(--primary-color);
    border-color: var(--secondary-color);
}

.textarea-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border-color);
}

.text-stats {
    font-size: 0.8rem;
    color: var(--secondary-text);
}


.controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    padding: 1.5rem;
    background: #fff;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.dark-theme .controls {
    background: var(--secondary-color);
}

.control-group {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.primary-btn,
.secondary-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.primary-btn {
    background: linear-gradient(135deg, var(--highlight-color), #2980b9);
    color: white;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.3);
}

.secondary-btn {
    background: transparent;
    color: var(--text-color);
    border: 2px solid var(--border-color);
}

.secondary-btn:hover {
    background: var(--highlight-color);
    color: white;
    border-color: var(--highlight-color);
}

.toggle-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
}

.diff-level-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.diff-level-container label {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
}

.diff-level-container label:hover {
    color: var(--highlight-color);
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.checkbox-label:hover {
    color: var(--highlight-color);
}

.checkbox-label input[type="checkbox"] {
    accent-color: var(--highlight-color);
}

.switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    -webkit-transition: .4s;
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    -webkit-transition: .4s;
    transition: .4s;
}

input:checked+.slider {
    background-color: var(--highlight-color);
}

input:focus+.slider {
    box-shadow: 0 0 4px var(--highlight-color);
}

input:checked+.slider:before {
    -webkit-transform: translateX(26px);
    -ms-transform: translateX(26px);
    transform: translateX(26px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

#compareBtn {
    background-color: var(--highlight-color);
    color: #fff;
    border: none;
    padding: 0.8rem 2rem;
    font-size: 1.2rem;
    font-weight: 700;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#compareBtn:hover,
#clearBtn:hover {
    background-color: #2980b9;
}

#clearBtn {
    background-color: var(--secondary-color);
    color: #fff;
    border: none;
    padding: 0.8rem 2rem;
    font-size: 1.2rem;
    font-weight: 700;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}


#diff-container {
    background: #fff;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.dark-theme #diff-container {
    background: var(--secondary-color);
}

.diff-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--highlight-color);
    padding-bottom: 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.diff-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.search-container {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.search-container input {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--background-color);
    color: var(--text-color);
    min-width: 200px;
}

.search-container input:focus {
    outline: none;
    border-color: var(--highlight-color);
}

.search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 0.5rem;
    font-size: 0.8rem;
    color: var(--secondary-text);
    z-index: 10;
    display: none;
}

.action-buttons {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

#diff-container h2 {
    color: var(--text-color);
    margin: 0;
}

.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    gap: 1rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--highlight-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

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

#copyBtn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

#copyBtn:hover {
    background: rgba(52, 152, 219, 0.1);
}

#copyBtn svg {
    stroke: var(--secondary-color);
    transition: var(--transition);
}

#copyBtn:hover svg {
    stroke: var(--highlight-color);
}

#diff-stats {
    font-size: 1rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 1rem;
}

#diff-stats .added-stat {
    color: var(--success-color);
}

#diff-stats .removed-stat {
    color: var(--danger-color);
}


#diff-output,
#diff-output-side-by-side .side-content {
    white-space: pre-wrap;
    font-family: 'Fira Code', 'Monaco', 'Consolas', monospace;
    border: 1px solid var(--border-color);
    padding: 1rem;
    border-radius: var(--border-radius);
    overflow-x: auto;
    min-height: 200px;
    background: var(--background-color);
    transition: var(--transition);
    line-height: 1.5;
    font-size: 14px;
}

.dark-theme #diff-output,
.dark-theme #diff-output-side-by-side .side-content {
    background: var(--primary-color);
    border-color: var(--secondary-color);
}

#diff-output-side-by-side {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    width: 100%;
    max-width: none;
    overflow: hidden;
}

.side {
    display: flex;
    flex-direction: column;
    min-width: 0;
    /* Prevents overflow */
    max-width: 100%;
    overflow: hidden;
}

.side-header {
    padding: 0.5rem 1rem;
    background: var(--secondary-color);
    color: white;
    font-weight: 600;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    text-align: center;
    flex-shrink: 0;
}

.side-content {
    flex: 1;
    overflow-x: auto;
    min-width: 0;
    background: var(--background-color);
    border: 1px solid var(--border-color);
    border-top: none;
    border-radius: 0 0 var(--border-radius) var(--border-radius);
    padding: 0.5rem;
}

#diff-output-side-by-side .side-content span,
#diff-output span {
    display: block;
    min-height: 1.6rem;
    /* padding-left: 4.5em; */
    position: relative;
    transition: var(--transition);
    line-height: 1.6;
    word-break: break-word;
    white-space: pre-wrap;
    /* margin: 0; */
}

#diff-output-side-by-side .side-content span::before,
#diff-output span::before {
    content: attr(data-line-number);
    position: absolute;
    left: 0;
    top: 0;
    width: 4em;
    text-align: right;
    color: var(--secondary-text);
    font-size: 0.85rem;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    padding-right: 0.5em;
    line-height: 1.6;
    font-weight: 500;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 2px;
    border-right: 1px solid var(--border-color);
}

.dark-theme #diff-output-side-by-side .side-content span::before,
.dark-theme #diff-output span::before {
    background: rgba(255, 255, 255, 0.1);
    color: var(--secondary-text);
    border-right-color: var(--border-color);
}

.placeholder {
    background: repeating-linear-gradient(90deg,
            transparent,
            transparent 10px,
            var(--border-color) 10px,
            var(--border-color) 11px);
    opacity: 0.3;
}

.dark-theme .placeholder {
    background: repeating-linear-gradient(90deg,
            transparent,
            transparent 10px,
            var(--secondary-color) 10px,
            var(--secondary-color) 11px);
}

/* #diff-output span {
    display: block;
    padding-left: 1rem;
    text-indent: -1rem;
} */


#diff-output .added,
#diff-output-side-by-side .added {
    background-color: var(--diff-add-bg);
    border-left: 4px solid var(--success-color);
}

#diff-output .removed,
#diff-output-side-by-side .removed {
    background-color: var(--diff-remove-bg);
    border-left: 4px solid var(--danger-color);
}

/* Intra-line highlighting for word and character level diffs */
.intra-line-added {
    background-color: rgba(46, 160, 67, 0.4);
    border: 1px solid var(--success-color);
    border-radius: 2px;
    padding: 1px 2px;
    font-weight: bold;
}

.intra-line-removed {
    background-color: rgba(248, 81, 73, 0.4);
    border: 1px solid var(--danger-color);
    border-radius: 2px;
    padding: 1px 2px;
    font-weight: bold;
}

.dark-theme .intra-line-added {
    background-color: rgba(46, 160, 67, 0.5);
    border-color: var(--success-color);
}

.dark-theme .intra-line-removed {
    background-color: rgba(248, 81, 73, 0.5);
    border-color: var(--danger-color);
}

.diff-highlight {
    background-color: rgba(255, 235, 59, 0.4);
    padding: 0 2px;
    border-radius: 2px;
}


#diff-output .added::before {
    content: '+' attr(data-line-number);
    color: var(--success-color);
    font-weight: bold;
    padding-left: 4px;
}



#diff-output .unchanged::before {
    content: ' ' attr(data-line-number);
    color: transparent;
    font-weight: bold;
    padding-left: 4px;
}



#diff-output .removed::before {
    content: '-' attr(data-line-number);
    color: var(--danger-color);
    font-weight: bold;
    padding-left: 4px;
}

#diff-output-side-by-side .added::before,
#diff-output-side-by-side .removed::before {
    content: attr(data-line-number);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: var(--background-color);
    margin: 5% auto;
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    margin: 0;
    color: var(--text-color);
}

.close-btn {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--secondary-text);
    transition: var(--transition);
}

.close-btn:hover {
    color: var(--danger-color);
}

.modal-body {
    padding: 1.5rem;
}

.setting-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.setting-group:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.setting-group label {
    font-weight: 500;
    color: var(--text-color);
}

.setting-group select {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--background-color);
    color: var(--text-color);
}

.export-options {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.export-btn {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--background-color);
    color: var(--text-color);
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
    font-weight: 500;
}

.export-btn:hover {
    border-color: var(--highlight-color);
    background: rgba(52, 152, 219, 0.1);
}

/* Keyboard Shortcuts */
.shortcuts-info {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--secondary-color);
    color: white;
    padding: 1rem;
    border-radius: var(--border-radius);
    font-size: 0.8rem;
    display: none;
    z-index: 100;
    box-shadow: var(--shadow);
}

.shortcut-item {
    margin-bottom: 0.5rem;
}

.shortcut-item:last-child {
    margin-bottom: 0;
}

kbd {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 3px;
    border: 1px solid rgba(0, 0, 0, 0.2);
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.2);
    color: white;
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    line-height: 1;
    padding: 2px 4px;
    white-space: nowrap;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .controls {
        flex-direction: column;
        gap: 1rem;
    }

    .control-group {
        flex-wrap: wrap;
        justify-content: center;
    }

    .diff-header {
        flex-direction: column;
        align-items: stretch;
    }

    .diff-controls {
        justify-content: center;
        flex-wrap: wrap;
    }

    .search-container input {
        min-width: 150px;
    }

    .file-header {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }

    .file-info {
        justify-content: space-between;
    }
}

@media (max-width: 480px) {
    header {
        padding: 1rem;
    }

    .header-controls {
        position: static;
        justify-content: center;
        margin-top: 1rem;
    }

    main {
        padding: 1rem;
    }

    .file-container textarea {
        min-height: 200px;
    }

    .modal-content {
        margin: 10% auto;
        width: 95%;
    }
}

/* Enhanced responsive styles for better mobile experience */
@media (max-width: 1024px) {
    #diff-output-side-by-side {
        gap: 0.5rem;
    }

    #diff-output-side-by-side .side-content span,
    #diff-output span {
        padding-left: 4em;
    }

    #diff-output-side-by-side .side-content span::before,
    #diff-output span::before {
        width: 3.5em;
        padding-right: 0.5em;
        font-size: 0.8rem;
    }
}

@media (max-width: 768px) {
    #diff-output-side-by-side {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    #diff-output-side-by-side .side-content span,
    #diff-output span {
        padding-left: 3.5em;
    }

    #diff-output-side-by-side .side-content span::before,
    #diff-output span::before {
        width: 3em;
        padding-right: 0.5em;
        font-size: 0.75rem;
    }
}

/* Syntax Highlighting Colors */
.syntax-keyword {
    color: #d73a49;
}

.syntax-string {
    color: #032f62;
}

.syntax-comment {
    color: #6a737d;
    font-style: italic;
}

.syntax-number {
    color: #005cc5;
}

.syntax-function {
    color: #6f42c1;
}

.syntax-variable {
    color: #e36209;
}

.dark-theme .syntax-keyword {
    color: #ff7b72;
}

.dark-theme .syntax-string {
    color: #a5d6ff;
}

.dark-theme .syntax-comment {
    color: #8b949e;
}

.dark-theme .syntax-number {
    color: #79c0ff;
}

.dark-theme .syntax-function {
    color: #d2a8ff;
}

.dark-theme .syntax-variable {
    color: #ffa657;
}

/* Animation for file drop */
@keyframes pulse {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.02);
    }

    100% {
        transform: scale(1);
    }
}

.file-container.dragover {
    animation: pulse 0.5s ease-in-out;
}

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

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    margin-left: -60px;
    width: 120px;
    background-color: var(--secondary-color);
    color: white;
    text-align: center;
    border-radius: 6px;
    padding: 5px;
    font-size: 0.8rem;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

.tooltip:hover::after {
    opacity: 1;
}

/* Loading animation */
.loading {
    opacity: 0.7;
    pointer-events: none;
}

/* Focus styles for accessibility */
button:focus,
input:focus,
select:focus,
textarea:focus {
    outline: 2px solid var(--highlight-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --diff-add-bg: rgba(46, 160, 67, 0.4);
        --diff-remove-bg: rgba(248, 81, 73, 0.4);
    }
}

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

/* Footer Styles */
footer {
    background: var(--primary-color);
    border-top: 1px solid var(--border-color);
    padding: 1rem 0;
    margin-top: 2rem;
    transition: var(--transition);
}

.dark-theme footer {
    background: var(--secondary-color);
    border-top-color: var(--tertiary-color);
}

.footer-content {
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-left p {
    margin: 0;
    color: var(--background-color);
    font-size: 0.9rem;
}

.dark-theme .footer-left p {
    color: var(--text-color);
}

.footer-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.footer-right a {
    color: var(--background-color);
    transition: var(--transition);
    padding: 0.5rem;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
}

.dark-theme .footer-right a {
    color: var(--text-color);
}

.footer-right a:hover {
    color: var(--highlight-color);
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.footer-right .version {
    background: var(--highlight-color);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: var(--border-radius);
    font-size: 0.8rem;
    font-weight: 500;
}

@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 0.5rem;
    }
}

.undo-redo-group {
    display: flex;
    gap: 8px;
    align-items: center;
}

.diff-lines-container {
    display: flex;
    flex-direction: column;
    width: 100%;
}

.diff-line {
    display: flex;
    align-items: flex-start;
    width: 100%;
    min-height: 1.5em;
    font-family: inherit;
}

.diff-line-number {
    color: var(--secondary-text);
    background: transparent;
    user-select: none;
    margin-right: 10px;
    margin-left: 5px;
    font-size: 0.95em;
    opacity: 0.7;
    padding-top: 1.1px;
}

.diff-line-content {
    flex: 1;
    word-break: break-word;
    white-space: pre-wrap;
    display: flex !important;
    align-items: center;
}

.diff-line.unchanged {
    border-left: 4px solid transparent;
}