/* CSS Variables for theme support */
:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --danger-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    --bs-body-bg: #f8fafc;
    --bs-body-color: #334155;
    --bs-border-color: #e2e8f0;
    --bs-navbar-bg: #ffffff;
    --bs-table-bg: #ffffff;
    --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --hover-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html[data-theme="dark"] {
    --bs-body-bg: #0f172a;
    --bs-body-color: #e2e8f0;
    --bs-border-color: #334155;
    --bs-navbar-bg: #1e293b;
    --bs-table-bg: #1e293b;
    --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.25), 0 10px 10px -5px rgba(0, 0, 0, 0.1);
    --hover-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.25), 0 10px 10px -5px rgba(0, 0, 0, 0.1);
}

/* Basic Styles */
html, body {
    height: 100vh;
    overflow: hidden; /* Prevent body from scrolling */
}

body {
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bs-body-bg);
    color: var(--bs-body-color);
    transition: var(--transition);
    line-height: 1.5;
    display: flex;
    flex-direction: column;
}

main {
    flex-grow: 1;
    overflow-y: auto; /* Main content area will scroll */
    display: flex;
    flex-direction: column;
}

.tab-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.tab-pane {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
}

/* Modern Header */
.navbar {
    background: var(--bs-navbar-bg) !important;
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--bs-border-color);
    box-shadow: var(--card-shadow);
    padding: 0.75rem 0;
    flex-shrink: 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.25rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: var(--transition);
}

.navbar-brand:hover {
    transform: translateY(-2px);
}

/* Modern Buttons */
.btn {
    border-radius: var(--border-radius);
    font-weight: 600;
    padding: 0.5rem 1rem;
    border: none;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    font-size: 0.875rem;
}

.btn-sm {
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--hover-shadow);
    will-change: transform, box-shadow;
}

.btn-primary {
    background: var(--primary-gradient);
    border: none;
}

.btn-success {
    background: var(--success-gradient);
    border: none;
}

.btn-danger {
    background: var(--danger-gradient);
    border: none;
}

.btn-outline-secondary {
    border: 1px solid var(--bs-border-color);
    background: transparent;
    color: var(--bs-body-color);
}

.btn-outline-secondary:hover {
    background: var(--bs-border-color);
    border-color: var(--bs-border-color);
    color: var(--bs-body-color);
}

.btn-outline-danger {
    border: 1px solid #ef4444;
    background: transparent;
    color: #ef4444;
}

.btn-outline-danger:hover {
    background: #ef4444;
    border-color: #ef4444;
    color: white;
}

/* Modern Cards and Containers */
.tab-content {
    background: var(--bs-table-bg);
    border: 1px solid var(--bs-border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.nav-tabs {
    border-bottom: 1px solid var(--bs-border-color);
    margin-bottom: 0;
}

.nav-tabs .nav-link {
    border: none;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    color: var(--bs-body-color);
    font-weight: 600;
    padding: 0.75rem 1.25rem;
    transition: var(--transition);
    font-size: 0.9rem;
}

.nav-tabs .nav-link:hover {
    background: var(--bs-border-color);
    transform: translateY(-2px);
}

.nav-tabs .nav-link.active {
    background: var(--primary-gradient);
    color: white;
    border-bottom: 2px solid transparent;
}

/* Modern Form Controls */
.form-control {
    border-radius: var(--border-radius);
    border: 1px solid var(--bs-border-color);
    padding: 0.5rem 0.75rem;
    transition: var(--transition);
    background: var(--bs-table-bg);
    color: var(--bs-body-color);
    font-size: 0.875rem;
}

.form-control:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
    background: var(--bs-table-bg);
    color: var(--bs-body-color);
}

.input-group .form-control {
    border-right: none;
}

.input-group .btn {
    border-left: none;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

/* Modern Table */
#table-container {
    flex-grow: 1;
    overflow: hidden;
    border: 1px solid var(--bs-border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    background: var(--bs-table-bg);
    display: flex;
    flex-direction: column;
    contain: content;
}

.table {
    margin: 0;
    background: var(--bs-table-bg);
    color: var(--bs-body-color);
}

.table-dark {
    background: var(--primary-gradient) !important;
    color: white;
}

.table th {
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    padding: 0.5rem 0.75rem;
    border: none;
    white-space: nowrap;
}

.table td {
    padding: 0.5rem 0.75rem;
    border-top: 1px solid var(--bs-border-color);
    transition: var(--transition);
    font-size: 0.85rem;
    vertical-align: middle;
}

.table-striped tbody tr:nth-of-type(odd) {
    background: rgba(102, 126, 234, 0.05);
}

.table-hover tbody tr:hover {
    background: rgba(102, 126, 234, 0.1);
}

/* Modern File List */
.list-group-item {
    background: var(--bs-table-bg);
    border: 1px solid var(--bs-border-color);
    border-radius: var(--border-radius) !important;
    margin-bottom: 0.5rem;
    transition: var(--transition);
    box-shadow: var(--card-shadow);
}

.file-item {
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
}

.file-item:hover {
    background: rgba(102, 126, 234, 0.1);
    transform: translateX(5px);
    box-shadow: var(--hover-shadow);
    will-change: transform, box-shadow;
}

.file-item span {
    font-weight: 600;
    color: var(--bs-body-color);
}

.delete-file-btn {
    background: var(--danger-gradient);
    border: none;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    transition: var(--transition);
}

.delete-file-btn:hover {
    transform: rotate(90deg) scale(1.1);
}

/* Dark Mode Toggle */
.form-switch .form-check-input {
    width: 60px;
    height: 30px;
    background: var(--bs-border-color);
    border: none;
    transition: var(--transition);
    cursor: pointer;
}

.form-switch .form-check-input:checked {
    background: var(--success-gradient);
}

.form-check-label {
    cursor: pointer;
    margin-left: 0.5rem;
    transition: var(--transition);
}

/* Profile Image */
#user-photo {
    border: 3px solid var(--bs-border-color);
    transition: var(--transition);
}

#user-photo:hover {
    transform: scale(1.1);
    border-color: #667eea;
}

/* Modern Headings */
h3, h4 {
    font-weight: 700;
    color: var(--bs-body-color);
    margin-bottom: 1.5rem;
}

h3 i, h4 i {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Enhanced Dark Theme */
html[data-theme="dark"] {
    color-scheme: dark;
}

html[data-theme="dark"] .navbar {
    background: var(--bs-navbar-bg) !important;
    border-bottom-color: var(--bs-border-color);
}

html[data-theme="dark"] .table-striped tbody tr:nth-of-type(odd) {
    background: rgba(102, 126, 234, 0.1);
}

html[data-theme="dark"] .table-hover tbody tr:hover {
    background: rgba(102, 126, 234, 0.2);
}

html[data-theme="dark"] .file-item:hover {
    background: rgba(102, 126, 234, 0.2);
}

html[data-theme="dark"] .btn-outline-secondary {
    color: #cbd5e1; /* slate-300 */
    border-color: #475569; /* slate-600 */
}
html[data-theme="dark"] .btn-outline-secondary:hover {
    background-color: #475569; /* slate-600 */
    color: #f8fafc; /* slate-50 */
}

html[data-theme="dark"] .btn-outline-danger {
    color: #fca5a5; /* red-300 */
    border-color: #ef4444; /* red-500 */
}
html[data-theme="dark"] .btn-outline-danger:hover {
    background-color: #ef4444; /* red-500 */
    color: #fef2f2; /* red-50 */
}

/* Additional Dark Mode Fixes */
html[data-theme="dark"] .form-text,
html[data-theme="dark"] #fileNameDisplay {
    color: #94a3b8; /* slate-400 */
}

html[data-theme="dark"] .form-control::placeholder {
    color: #94a3b8; /* slate-400 */
    opacity: 1; /* Override Bootstrap's default opacity */
}

html[data-theme="dark"] .nav-tabs .nav-link:not(.active) {
    color: #cbd5e1; /* slate-300 */
}

html[data-theme="dark"] .nav-tabs .nav-link:not(.active):hover {
    color: #f8fafc; /* slate-50 */
    background-color: #334155; /* slate-700 */
}

html[data-theme="dark"] .row-header,
html[data-theme="dark"] .row-number {
    color: #cbd5e1 !important; /* slate-300 */
    background-color: #1e293b !important; /* slate-800 */
    border-right-color: #334155; /* slate-700 */
}

html[data-theme="dark"] .form-control::file-selector-button {
    background: #334155; /* slate-700 */
    color: #e2e8f0; /* slate-200 */
    border: none;
    border-radius: var(--border-radius);
    padding: 0.5rem 1rem;
    font-weight: 600;
    transition: var(--transition);
    margin-right: 1rem;
    cursor: pointer;
}

html[data-theme="dark"] .form-control::file-selector-button:hover {
    background: #475569; /* slate-600 */
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

.tab-pane {
    animation: fadeIn 0.5s ease-out;
}

.list-group-item {
    animation: slideIn 0.3s ease-out;
}

/* Maximize and Fullscreen Styles */
body.maximized #upload-container,
body.maximized #main-tabs {
    display: none !important;
}

body.maximized #table-container {
    height: calc(100vh - 150px) !important;
    max-height: none !important;
    margin-top: 1rem;
}

body.maximized main {
    padding: 0 !important;
    margin: 0 !important;
}

body.maximized #editor-view {
    border: none !important;
    padding: 1rem !important;
    background: var(--bs-body-bg);
}

/* Fullscreen Styles */
body.fullscreen-mode .navbar,
body.fullscreen-mode #upload-container,
body.fullscreen-mode #main-tabs {
    display: none !important;
}

body.fullscreen-mode {
    background: var(--bs-body-bg);
}

body.fullscreen-mode main {
    padding: 1rem !important;
    margin: 0 !important;
    height: 100vh;
}

body.fullscreen-mode #editor-view {
    height: 100%;
    padding: 0 !important;
    border: none !important;
}

body.fullscreen-mode #editor-controls {
    position: static;
    flex-shrink: 0;
}

body.fullscreen-mode #table-container {
    height: auto !important;
    max-height: none !important;
    margin-top: 0;
}

/* Combined Maximize + Fullscreen state */
/* This ensures fullscreen layout takes precedence when both modes are active */
body.maximized.fullscreen-mode main {
    padding: 1rem !important;
}
body.maximized.fullscreen-mode #editor-view {
    padding: 0 !important;
}
body.maximized.fullscreen-mode #table-container {
    margin-top: 0;
    height: auto !important; /* Override the fixed height from maximize mode */
    flex-grow: 1;
}

/* Spreadsheet Styles */
.spreadsheet-container {
    overflow: auto;
    flex-grow: 1;
}

.spreadsheet-table {
    margin-bottom: 0;
}

.row-header, .row-number {
    position: sticky;
    left: 0;
    z-index: 2;
    background: var(--bs-table-bg);
    border-right: 1px solid var(--bs-border-color);
}

.col-header {
    position: sticky;
    top: 0;
    z-index: 3;
    background: var(--primary-gradient);
    color: white;
}

.column-letter {
    font-size: 0.7rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.7);
}

.column-name {
    font-weight: 600;
    font-size: 0.85rem;
}

.cell-selected {
    background-color: rgba(102, 126, 234, 0.25) !important;
    box-shadow: inset 0 0 0 2px #667eea;
}

.highlight {
    background-color: #fff3cd;
    color: #664d03;
}

.current-match {
    background-color: #ffc107;
    box-shadow: inset 0 0 0 2px #d9a400;
}

html[data-theme="dark"] .highlight {
    background-color: #493f22;
    color: #ffecb3;
}

html[data-theme="dark"] .current-match {
    background-color: #ffc107;
    color: #000;
}

#editor-view {
    display: flex;
    flex-direction: column;
    height: 100%;
}

/* Compact Editor Controls */
#editor-controls {
    padding: 0.75rem;
    background: var(--bs-table-bg);
    border: 1px solid var(--bs-border-color);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
}

#editor-controls .row {
    margin: 0;
}

#editor-controls .col-md-4 {
    padding: 0 0.5rem;
}

#editor-controls .input-group {
    margin-bottom: 0.5rem;
}

#editor-controls .d-flex {
    gap: 0.5rem;
}

/* Mobile Optimization */
@media (max-width: 768px) {
    .btn {
        padding: 0.625rem 1rem;
        font-size: 0.875rem;
    }
    
    .form-control {
        padding: 0.625rem 0.75rem;
        font-size: 0.875rem;
    }
    
    .nav-tabs .nav-link {
        padding: 0.75rem 1rem;
        font-size: 0.875rem;
    }
    
    #global-search {
        font-size: 0.875rem;
        padding: 0.625rem 0.75rem;
    }
    
    .input-group .btn {
        padding: 0.625rem 1rem;
    }
    
    #table-container table {
        font-size: 0.8rem;
    }
    
    #table-container td,
    #table-container th {
        padding: 0.375rem 0.5rem;
    }
    
    .file-item {
        padding: 1rem;
    }
    
    .tab-content {
        padding: 1rem;
    }
    
    .navbar-brand {
        font-size: 1.125rem;
    }
    #editor-controls .col-md-4 {
        margin-bottom: 0.75rem;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--bs-border-color);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-gradient);
}

::-webkit-scrollbar-corner {
    background: transparent;
}

html[data-theme="dark"] ::-webkit-scrollbar-track {
    background: #1e293b; /* slate-800 */
}

html[data-theme="dark"] ::-webkit-scrollbar-thumb {
    background: #475569; /* slate-600 */
}

html[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
    background: #64748b; /* slate-500 */
}

/* Utility Classes */
.d-none {
    display: none !important;
}

/* Loading Animation */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.loading {
    animation: pulse 2s infinite;
}

/* Success/Error States */
.success-state {
    border-color: #10b981 !important;
    box-shadow: 0 0 0 0.2rem rgba(16, 185, 129, 0.25) !important;
}

.error-state {
    border-color: #ef4444 !important;
    box-shadow: 0 0 0 0.2rem rgba(239, 68, 68, 0.25) !important;
}

/* Search and Replace Highlights */
.search-highlight {
    background: #ffeb3b !important;
    color: #000 !important;
    font-weight: bold;
    border-radius: 2px;
    padding: 1px 2px;
}

.current-match {
    background: #ff5722 !important;
    color: white !important;
    animation: pulse-highlight 1s ease-in-out;
}

@keyframes pulse-highlight {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* Dark theme search highlights */
html[data-theme="dark"] .search-highlight {
    background: #ffc107 !important;
    color: #000 !important;
}

html[data-theme="dark"] .current-match {
    background: #dc3545 !important;
    color: white !important;
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--primary-gradient);
    border-radius: var(--border-radius);
}

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