/* Premium Design System & Stylesheet for PDF Skenda Splitter */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

:root {
    /* Color Palette */
    --bg-primary: #0b0f19;
    --bg-secondary: #131c2e;
    --bg-card: rgba(30, 41, 59, 0.7);
    --border-color: rgba(255, 255, 255, 0.08);
    
    --primary: #3b82f6;
    --primary-glow: rgba(59, 130, 246, 0.3);
    --secondary: #10b981;
    --secondary-glow: rgba(16, 185, 129, 0.3);
    --accent: #8b5cf6;
    
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --text-inverse: #0f172a;
    
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Variables */
body.light-theme {
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --bg-card: rgba(255, 255, 255, 0.8);
    --border-color: rgba(15, 23, 42, 0.08);
    
    --text-main: #0f172a;
    --text-muted: #475569;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Plus Jakarta Sans', sans-serif;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-main);
    min-height: 100vh;
    overflow-x: hidden;
    transition: var(--transition);
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(59, 130, 246, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(139, 92, 246, 0.08) 0%, transparent 40%);
}

.app-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.2rem;
}

.theme-toggle {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.theme-toggle:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
    box-shadow: 0 4px 12px var(--primary-glow);
}

/* Dashboard Layout */


/* Sidebar Panels */
.panel {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.8rem;
    height: fit-content;
    position: sticky;
    top: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Upload Area */
.upload-zone {
    display: block;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: 2.5rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.01);
}

.upload-zone:hover, .upload-zone.dragover {
    border-color: var(--primary);
    background: rgba(59, 130, 246, 0.04);
    transform: scale(1.01);
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: inline-block;
    transition: var(--transition);
}

.upload-zone:hover .upload-icon {
    transform: translateY(-5px);
    color: var(--primary);
}

.upload-zone h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.upload-zone p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

#file-input {
    display: none;
}

/* Active File Info */
.file-info-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    padding: 1rem;
    border-radius: var(--radius-md);
    animation: slideIn 0.3s ease;
}

.file-icon {
    font-size: 2rem;
    color: #ef4444;
}

.file-details {
    flex-grow: 1;
    overflow: hidden;
}

.file-name {
    font-weight: 600;
    font-size: 0.9rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-size {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.btn-remove {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
    padding: 0.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.btn-remove:hover {
    color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

/* Naming Engine Settings */
.settings-section h4 {
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.8rem;
    font-weight: 700;
}

.form-group {
    margin-bottom: 1.2rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.form-select, .form-input {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    transition: var(--transition);
    outline: none;
}

.form-select option {
    background-color: #131c2e;
    color: #f8fafc;
}

body.light-theme .form-select, body.light-theme .form-input {
    background: #ffffff;
    color: #000000;
}

body.light-theme .form-select option {
    color: #000000;
    background-color: #ffffff;
}

.form-select:focus, .form-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-glow);
}

.helper-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.35rem;
    line-height: 1.3;
}

/* Dynamic Action Buttons */
.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    margin-top: 1rem;
}

.btn {
    width: 100%;
    padding: 0.9rem 1.5rem;
    border-radius: var(--radius-md);
    border: none;
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: #ffffff;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.2);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.35);
}

.btn-secondary {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-main);
}

.btn-secondary:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--text-muted);
}

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

/* Main Content Workspace */
.workspace {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.empty-state {
    flex-grow: 1;
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 6rem 2rem;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.empty-illustration {
    font-size: 5rem;
    margin-bottom: 1.5rem;
    opacity: 0.3;
    animation: float 4s ease-in-out infinite;
}

.empty-state h2 {
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: var(--text-muted);
    max-width: 400px;
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Active Processing State */
.loading-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 3rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading-bar-wrapper {
    width: 100%;
    max-width: 400px;
    height: 8px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    overflow: hidden;
    position: relative;
    border: 1px solid var(--border-color);
}

.loading-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 10px;
    transition: width 0.2s ease;
}

/* Page List & Cards */
.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 1.2rem 1.8rem;
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
}

.results-title {
    font-weight: 700;
    font-size: 1.1rem;
}

.page-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.2rem;
}

@media (min-width: 640px) {
    .page-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1200px) {
    .page-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.page-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.page-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: 0 10px 25px rgba(59, 130, 246, 0.15);
}

.card-preview-wrapper {
    position: relative;
    aspect-ratio: 1 / 1.414; /* A4 Ratio */
    background: #000;
    overflow: hidden;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-preview-wrapper canvas {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: #ffffff;
}

.page-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    background: rgba(15, 23, 42, 0.85);
    color: #fff;
    padding: 0.35rem 0.7rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(5px);
}

.card-content {
    padding: 1.2rem;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    flex-grow: 1;
}

.card-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.filename-input-group {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.filename-input {
    flex-grow: 1;
    background: rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    outline: none;
    transition: var(--transition);
}

body.light-theme .filename-input {
    background: #ffffff;
    color: #000000;
}

.filename-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-glow);
}

.filename-extension {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 600;
}

.detected-text-wrapper {
    background: rgba(0, 0, 0, 0.1);
    padding: 0.6rem;
    border-radius: var(--radius-sm);
    max-height: 80px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
}

body.light-theme .detected-text-wrapper {
    background: var(--bg-secondary);
}

.detected-text-wrapper p {
    font-size: 0.75rem;
    line-height: 1.4;
    color: var(--text-muted);
    word-break: break-all;
    white-space: pre-wrap;
}

.card-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: auto;
    padding-top: 0.5rem;
}

.btn-card-action {
    flex: 1;
    padding: 0.5rem;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-main);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
    transition: var(--transition);
}

.btn-card-action:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: #ffffff;
}

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

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* PDF Compression Cards Styling */
.compression-options {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    margin-bottom: 1.2rem;
}

.compression-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.8rem 1rem;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

body.light-theme .compression-card {
    background: #ffffff;
}

.compression-card:hover {
    transform: translateX(4px);
    border-color: var(--primary);
    background: rgba(59, 130, 246, 0.03);
}

body.light-theme .compression-card:hover {
    background: rgba(59, 130, 246, 0.02);
}

.compression-card.active {
    border-color: var(--primary);
    background: rgba(59, 130, 246, 0.08);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.15);
}

body.light-theme .compression-card.active {
    background: rgba(59, 130, 246, 0.05);
}

.compression-card.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(to bottom, var(--primary), var(--accent));
}

.compression-info {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.compression-icon {
    font-size: 1.4rem;
}

.compression-meta {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.compression-title {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-main);
}

.compression-desc {
    font-size: 0.72rem;
    color: var(--text-muted);
    line-height: 1.3;
}

/* Results Table View */
.results-table-wrapper {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    margin-top: 1rem;
    width: 100%;
    overflow-x: auto;
}

.results-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.results-table th, .results-table td {
    padding: 0.9rem 1.2rem;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

.results-table th {
    background: rgba(255, 255, 255, 0.015);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

body.light-theme .results-table th {
    background: rgba(0, 0, 0, 0.02);
}

.results-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.01);
}

body.light-theme .results-table tbody tr:hover {
    background: rgba(0, 0, 0, 0.01);
}

.size-badge {
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.78rem;
    padding: 0.3rem 0.6rem;
    border-radius: 6px;
    display: inline-block;
    white-space: nowrap;
}

.size-badge.original {
    background: rgba(59, 130, 246, 0.08);
    color: #60a5fa;
    border: 1px solid rgba(59, 130, 246, 0.15);
}

body.light-theme .size-badge.original {
    background: rgba(59, 130, 246, 0.06);
    color: #2563eb;
}

.size-badge.compressed {
    background: rgba(16, 185, 129, 0.08);
    color: #34d399;
    border: 1px solid rgba(16, 185, 129, 0.15);
    font-weight: 600;
}

body.light-theme .size-badge.compressed {
    background: rgba(16, 185, 129, 0.06);
    color: #059669;
}

.table-filename-input-group {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    max-width: 400px;
}

.table-filename-input {
    width: 100%;
    background: rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 0.45rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    outline: none;
    transition: var(--transition);
}

body.light-theme .table-filename-input {
    background: #ffffff;
    color: #000000;
}

.table-filename-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-glow);
}

.table-btn-download {
    padding: 0.45rem 0.85rem;
    font-size: 0.78rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-main);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
    transition: var(--transition);
    margin: 0 auto;
}

.table-btn-download:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: #ffffff;
}

/* Single Compress Result Card */
.compress-result-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 3rem 2rem;
    text-align: center;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    animation: slideIn 0.4s ease;
    width: 100%;
}

body.light-theme .compress-result-card {
    background: #ffffff;
}

.compress-success-icon {
    font-size: 4rem;
    animation: float 3s ease-in-out infinite;
}

.compress-result-card h2 {
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, #10b981 0%, #3b82f6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.compress-file-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-muted);
    word-break: break-all;
    max-width: 80%;
}

.compress-stats-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    margin-top: 1rem;
    width: 100%;
}

.compress-stat-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    min-width: 120px;
}

.compress-stat-label {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.compress-stat-value {
    font-size: 1.1rem;
    padding: 0.5rem 1rem;
    border-radius: 8px;
}

.compress-arrow {
    font-size: 1.5rem;
    color: var(--text-muted);
}

.compress-saving-badge {
    background: rgba(16, 185, 129, 0.15);
    color: #10b981;
    border: 1px solid rgba(16, 185, 129, 0.3);
    padding: 0.4rem 1rem;
    border-radius: var(--radius-lg);
    font-size: 0.9rem;
    font-weight: 700;
    margin-top: 0.5rem;
}

/* Tab Navigation Styles */
.app-tabs {
    display: flex;
    gap: 0.8rem;
    margin-bottom: 2rem;
    padding-bottom: 0.8rem;
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch; /* Smooth touch swipe on iOS */
    -ms-overflow-style: none;  /* IE and Edge */
    scrollbar-width: none;  /* Firefox */
}

/* Hide scrollbar for Chrome, Safari and Opera */
.app-tabs::-webkit-scrollbar {
    display: none;
}

.tab-button {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.95rem;
    font-weight: 700;
    padding: 0.6rem 1.1rem;
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: var(--transition);
    outline: none;
    flex-shrink: 0; /* Prevent text wrapping/squeezing on mobile */
}

.tab-button:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.03);
}

body.light-theme .tab-button:hover {
    background: rgba(0, 0, 0, 0.03);
}

.tab-button.active {
    color: #ffffff;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.25);
}

/* Tab Content Visibility */
.tab-content {
    display: none;
    width: 100%;
}

.tab-content.active {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    width: 100%;
}

@media (min-width: 1024px) {
    .tab-content.active {
        grid-template-columns: 380px 1fr;
    }
}

/* Merger Visual File List */
.merge-files-list {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    margin-top: 1rem;
    max-height: 500px;
    overflow-y: auto;
    padding-right: 0.5rem;
}

.merge-file-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.9rem 1.2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: var(--transition);
    animation: slideIn 0.3s ease;
}

body.light-theme .merge-file-item {
    background: #ffffff;
}

.merge-file-item:hover {
    border-color: var(--primary);
    transform: translateX(4px);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.08);
}

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

.merge-file-index {
    font-size: 0.8rem;
    font-weight: 800;
    color: #ffffff;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: 0 2px 6px rgba(59, 130, 246, 0.3);
}

.merge-file-meta {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    overflow: hidden;
}

.merge-file-name {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-main);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.merge-file-details {
    font-size: 0.72rem;
    color: var(--text-muted);
}

/* Conversion Cards Grid */
.conversion-options-grid {
    display: grid;
    grid-template-columns: 1fr; /* 1 Column on mobile by default to prevent cut off */
    gap: 0.8rem;
    margin-bottom: 1rem;
}

@media (min-width: 480px) {
    .conversion-options-grid {
        grid-template-columns: repeat(2, 1fr); /* 2 Columns on larger screens */
    }
}

.conversion-mode-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.8rem 0.5rem; /* Reduced padding on mobile */
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

@media (min-width: 480px) {
    .conversion-mode-card {
        padding: 1rem; /* Restore padding on larger viewports */
    }
}

body.light-theme .conversion-mode-card {
    background: #ffffff;
}

.conversion-mode-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    background: rgba(59, 130, 246, 0.02);
}

.conversion-mode-card.active {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(147, 51, 234, 0.1) 100%);
    border-color: var(--primary);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.15);
}

.conversion-card-icon {
    font-size: 1.8rem;
}

.conversion-card-title {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-main);
}

/* Mobile Responsive Improvements */
@media (max-width: 640px) {
    .app-container {
        padding: 1rem 0.8rem;
    }
    
    header {
        margin-bottom: 1.5rem;
        padding-bottom: 1rem;
    }
    
    .app-tabs {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
        padding-bottom: 0.5rem;
        white-space: normal;
        width: 100%;
        overflow: hidden;
    }
    
    .tab-button {
        font-size: 0.8rem;
        padding: 0.6rem 0.4rem;
        text-align: center;
        white-space: normal;
        line-height: 1.3;
        display: flex;
        align-items: center;
        justify-content: center;
        min-height: 44px; /* Ensure good tap target size */
    }
    
    .panel {
        padding: 1.2rem;
        gap: 1.2rem;
    }
    
    .empty-state {
        padding: 3rem 1.5rem;
    }
}