/* ==========================================
   PROFESSIONAL MACHINE MANAGEMENT SYSTEM CSS
   Mobile-First Responsive Design with Modern UI
   ========================================== */

/* CSS Variables for Consistent Theming */
:root {
    --primary-color: #2c3e50;
    --primary-light: #34495e;
    --secondary-color: #3498db;
    --secondary-light: #5dade2;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --info-color: #17a2b8;
    --light-bg: #f8f9fa;
    --white: #ffffff;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    --border-radius: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 20px;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 25px rgba(0,0,0,0.15);
    --shadow-xl: 0 20px 40px rgba(0,0,0,0.2);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset and Base Styles */
* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    font-family: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--gray-800);
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 0.5rem;
    color: var(--gray-900);
}

.text-gradient {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Container and Layout */
.container-fluid {
    padding: 1rem;
    max-width: 1400px;
    margin: 0 auto;
}

/* Header Styling */
.main-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius-xl);
    text-align: center;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
}

.main-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 100" fill="rgba(255,255,255,0.1)"><polygon points="0,0 1000,0 1000,100 500,100 0,50"/></svg>');
    background-size: cover;
    pointer-events: none;
}

.main-header h1 {
    margin: 0;
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--white);
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
    position: relative;
    z-index: 1;
}

.main-header p {
    font-size: clamp(0.9rem, 2vw, 1.1rem);
    margin: 0.5rem 0 0 0;
    opacity: 0.9;
    position: relative;
    z-index: 1;
}

/* Stats Cards */
.stats-card {
    background: var(--white);
    border-radius: var(--border-radius-xl);
    padding: 1.5rem;
    text-align: center;
    box-shadow: var(--shadow-md);
    margin-bottom: 1rem;
    transition: var(--transition);
    border: 1px solid var(--gray-200);
    position: relative;
    overflow: hidden;
}

.stats-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
}

.stats-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stats-number {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    line-height: 1;
}

.stats-card h6 {
    color: var(--gray-600);
    font-weight: 500;
    margin: 0;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Card Styling */
.card {
    border: none;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-lg);
    margin-bottom: 2rem;
    overflow: hidden;
    background: var(--white);
}

.card-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--white);
    padding: 1.5rem;
    border: none;
    position: relative;
}

.card-body {
    padding: 2rem;
}

/* Navigation Tabs */
.nav-tabs {
    border: none;
    margin-bottom: 0;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.nav-tabs .nav-item {
    margin-bottom: 0.5rem;
}

.nav-tabs .nav-link {
    border: none;
    border-radius: var(--border-radius);
    margin: 0;
    padding: 0.75rem 1.25rem;
    color: rgba(255, 255, 255, 0.8);
    font-weight: 600;
    transition: var(--transition);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    font-size: 0.9rem;
    white-space: nowrap;
}

.nav-tabs .nav-link:hover {
    color: var(--white);
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

.nav-tabs .nav-link.active {
    background: var(--white);
    color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.nav-tabs .nav-link i {
    margin-right: 0.5rem;
}

/* Button Styling */
.btn-custom {
    border-radius: var(--border-radius);
    padding: 0.625rem 1.25rem;
    font-weight: 600;
    border: none;
    transition: var(--transition);
    font-size: 0.9rem;
    position: relative;
    overflow: hidden;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-custom::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn-custom:hover::before {
    left: 100%;
}

.btn-custom:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-custom:active {
    transform: translateY(0);
}

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

.btn-success-custom {
    background: linear-gradient(135deg, var(--success-color), #229954);
    color: var(--white);
}

.btn-warning-custom {
    background: linear-gradient(135deg, var(--warning-color), #e67e22);
    color: var(--white);
}

.btn-danger-custom {
    background: linear-gradient(135deg, var(--danger-color), #c0392b);
    color: var(--white);
}

.btn-info-custom {
    background: linear-gradient(135deg, var(--info-color), #138496);
    color: var(--white);
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
}

/* Form Styling */
.form-control, .form-select {
    border-radius: var(--border-radius);
    border: 2px solid var(--gray-300);
    padding: 0.75rem 1rem;
    transition: var(--transition);
    font-size: 0.9rem;
    background: var(--white);
}

.form-control:focus, .form-select:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.15);
    outline: none;
}

.form-floating label {
    padding: 0.75rem 1rem;
    color: var(--gray-600);
    font-weight: 500;
}

.form-floating .form-control:focus ~ label,
.form-floating .form-control:not(:placeholder-shown) ~ label {
    color: var(--secondary-color);
    transform: scale(0.85) translateY(-0.5rem) translateX(0.15rem);
}

/* Table Styling */
.table-container {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    margin-bottom: 1.5rem;
}

.table {
    margin: 0;
    font-size: 0.85rem;
}

.table th {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--white);
    border: none;
    padding: 1rem 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.8rem;
    white-space: nowrap;
}

.table td {
    padding: 0.75rem;
    border-bottom: 1px solid var(--gray-200);
    vertical-align: middle;
}

.table tbody tr {
    transition: var(--transition);
}

.table tbody tr:hover {
    background-color: var(--gray-100);
    transform: scale(1.01);
}

/* Compact table for mobile */
.table-compact th,
.table-compact td {
    padding: 0.5rem 0.3rem;
    font-size: 0.8rem;
}

/* Badge Styling */
.badge-custom {
    padding: 0.4rem 0.8rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Modal Styling */
.modal-content {
    border-radius: var(--border-radius-lg);
    border: none;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.modal-header {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    color: var(--white);
    border: none;
    padding: 1.5rem;
}

.modal-header .btn-close {
    filter: invert(1);
    opacity: 0.8;
}

.modal-body {
    padding: 2rem;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--gray-200);
    background: var(--gray-100);
}

/* Alert Styling */
.alert-custom {
    border: none;
    border-radius: var(--border-radius);
    padding: 1rem 1.5rem;
    margin-bottom: 1rem;
}

.alert-floating {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 9999;
    min-width: 300px;
    max-width: 90vw;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-xl);
    animation: slideInRight 0.3s ease-out;
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Select2 Styling */
.select2-container--bootstrap-5 .select2-selection {
    border-radius: var(--border-radius) !important;
    border: 2px solid var(--gray-300) !important;
    padding: 0.5rem 0.75rem !important;
    min-height: calc(2.25rem + 2px) !important;
}

.select2-container--bootstrap-5.select2-container--focus .select2-selection {
    border-color: var(--secondary-color) !important;
    box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.15) !important;
}

.select2-dropdown {
    border-radius: var(--border-radius) !important;
    border: 2px solid var(--secondary-color) !important;
    box-shadow: var(--shadow-md) !important;
}

/* Auto-fill Indicator */
.auto-fill-indicator {
    background: linear-gradient(135deg, #d4edda, #c3e6cb);
    border: 1px solid #c3e6cb;
    border-radius: var(--border-radius);
    padding: 0.5rem 0.75rem;
    margin-top: 0.5rem;
    font-size: 0.8rem;
    color: #155724;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Loading Spinner */
.loading-spinner {
    display: none;
}

/* Bill Viewer */
.bill-viewer {
    max-width: 100%;
    max-height: 70vh;
    overflow: auto;
    border-radius: var(--border-radius);
}

.bill-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
}

.bill-pdf {
    width: 100%;
    height: 60vh;
    border: none;
    border-radius: var(--border-radius);
}

.bill-placeholder {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--gray-600);
    background: var(--gray-100);
    border-radius: var(--border-radius);
    border: 2px dashed var(--gray-300);
}

/* Pagination Styling */
.pagination-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    background: var(--gray-100);
    border-top: 1px solid var(--gray-300);
    flex-wrap: wrap;
    gap: 1rem;
}

.pagination-info {
    color: var(--gray-600);
    font-size: 0.85rem;
    font-weight: 500;
}

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

.pagination-nav {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    border-radius: var(--border-radius);
    background: var(--white);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.pagination-nav .page-item {
    margin: 0;
}

.pagination-nav .page-link {
    border: none;
    padding: 0.5rem 0.75rem;
    color: var(--gray-600);
    background: var(--white);
    transition: var(--transition);
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
}

.pagination-nav .page-link:hover {
    background: var(--gray-100);
    color: var(--secondary-color);
}

.pagination-nav .page-item.active .page-link {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    color: var(--white);
}

.pagination-nav .page-item.disabled .page-link {
    color: var(--gray-300);
    cursor: not-allowed;
}

.page-size-selector {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.page-size-selector select {
    border-radius: var(--border-radius);
    border: 2px solid var(--gray-300);
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
    background: var(--white);
}

/* Export Buttons */
.export-buttons {
    margin-bottom: 1.5rem;
    display: flex;
    gap: 0.75rem;
    justify-content: flex-end;
    flex-wrap: wrap;
}

/* Actions Column */
.actions-column {
    white-space: nowrap;
    width: 1%;
}

.btn-group .btn {
    margin: 0 2px;
}

/* Responsive Design - Mobile First */

/* Extra Small Devices (phones, 576px and down) */
@media (max-width: 575.98px) {
    .container-fluid {
        padding: 0.5rem;
    }
    
    .main-header {
        padding: 1.5rem 1rem;
        margin-bottom: 1rem;
    }
    
    .main-header h1 {
        font-size: 1.5rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .stats-card {
        padding: 1rem;
        margin-bottom: 0.75rem;
    }
    
    .stats-number {
        font-size: 1.8rem;
    }
    
    .nav-tabs .nav-link {
        padding: 0.5rem 0.75rem;
        font-size: 0.8rem;
    }
    
    .nav-tabs .nav-link i {
        margin-right: 0.25rem;
    }
    
    /* Hide text on mobile, show only icons */
    .nav-tabs .nav-link .nav-text {
        display: none;
    }
    
    .table-responsive {
        font-size: 0.75rem;
    }
    
    .table th,
    .table td {
        padding: 0.5rem 0.25rem;
    }
    
    .btn-custom {
        padding: 0.5rem 1rem;
        font-size: 0.8rem;
    }
    
    .btn-sm {
        padding: 0.25rem 0.5rem;
        font-size: 0.7rem;
    }
    
    .badge-custom {
        padding: 0.2rem 0.5rem;
        font-size: 0.7rem;
        display: block;
        margin: 1px 0;
        text-align: center;
    }
    
    .pagination-container {
        flex-direction: column;
        text-align: center;
        padding: 1rem;
    }
    
    .pagination-controls {
        justify-content: center;
        width: 100%;
    }
    
    .pagination-nav .page-link {
        padding: 0.4rem 0.6rem;
        min-width: 35px;
        height: 35px;
        font-size: 0.8rem;
    }
    
    .page-size-selector {
        order: -1;
    }
    
    .export-buttons {
        justify-content: center;
        margin-bottom: 1rem;
    }
    
    .export-buttons .btn {
        flex: 1;
        min-width: 120px;
    }
    
    /* Modal adjustments */
    .modal-dialog {
        margin: 1rem 0.5rem;
    }
    
    .modal-body {
        padding: 1rem;
    }
    
    .modal-footer {
        padding: 1rem;
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .modal-footer .btn {
        width: 100%;
    }
    
    /* Form adjustments */
    .form-floating label {
        font-size: 0.8rem;
    }
    
    /* Bill viewer mobile */
    .bill-pdf {
        height: 50vh;
    }
    
    /* Hide certain table columns on mobile */
    .d-none.d-md-table-cell {
        display: none !important;
    }
}

/* Small Devices (landscape phones, 576px and up) */
@media (min-width: 576px) and (max-width: 767.98px) {
    .nav-tabs .nav-link .nav-text {
        display: inline;
    }
    
    .export-buttons {
        justify-content: flex-end;
    }
    
    .export-buttons .btn {
        min-width: 140px;
    }
    
    .pagination-container {
        flex-direction: row;
    }
}

/* Medium Devices (tablets, 768px and up) */
@media (min-width: 768px) {
    .table th,
    .table td {
        padding: 0.75rem;
    }
    
    .card-body {
        padding: 2rem;
    }
    
    .d-none.d-md-table-cell {
        display: table-cell !important;
    }
}

/* Large Devices (desktops, 992px and up) */
@media (min-width: 992px) {
    .container-fluid {
        padding: 1.5rem;
    }
    
    .main-header {
        padding: 3rem 2rem;
    }
    
    .stats-card {
        padding: 2rem;
    }
    
    .stats-number {
        font-size: 3rem;
    }
}

/* Extra Large Devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
    .container-fluid {
        padding: 2rem;
    }
    
    .table th,
    .table td {
        padding: 1rem 0.75rem;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --white: #1a1a1a;
        --gray-100: #2d2d2d;
        --gray-200: #404040;
        --gray-300: #4d4d4d;
        --gray-600: #a0a0a0;
        --gray-700: #b0b0b0;
        --gray-800: #d0d0d0;
        --gray-900: #ffffff;
        --light-bg: #1a1a1a;
    }
    
    body {
        background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    }
    
    .form-control, .form-select {
        background: var(--gray-100);
        border-color: var(--gray-300);
        color: var(--gray-800);
    }
    
    .table-container {
        background: var(--gray-100);
    }
}

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

/* Focus Indicators */
.btn-custom:focus,
.form-control:focus,
.form-select:focus {
    outline: 2px solid var(--secondary-color);
    outline-offset: 2px;
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    .btn-custom {
        border: 2px solid currentColor;
    }
    
    .nav-tabs .nav-link.active {
        border: 2px solid var(--primary-color);
    }
}

/* Print Styles */
@media print {
    body {
        background: white !important;
        color: black !important;
    }
    
    .main-header,
    .nav-tabs,
    .btn,
    .export-buttons,
    .pagination-container {
        display: none !important;
    }
    
    .card {
        box-shadow: none !important;
        border: 1px solid #ccc !important;
    }
    
    .table th {
        background: #f5f5f5 !important;
        color: black !important;
    }
}

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

::-webkit-scrollbar-track {
    background: var(--gray-200);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--gray-600);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-700);
}

/* Loading States */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(5px);
}

.loading-content {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    text-align: center;
    box-shadow: var(--shadow-xl);
    max-width: 300px;
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.3s ease-in;
}

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

.slide-up {
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Utility Classes */
.text-truncate-mobile {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 120px;
}

@media (min-width: 768px) {
    .text-truncate-mobile {
        max-width: none;
        white-space: normal;
        overflow: visible;
        text-overflow: clip;
    }
}

.glass-effect {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Enhanced Mobile Navigation */
@media (max-width: 575.98px) {
    .nav-tabs {
        justify-content: space-around;
        margin-bottom: 1rem;
    }
    
    .nav-tabs .nav-item {
        flex: 1;
        text-align: center;
    }
    
    .nav-tabs .nav-link {
        padding: 0.75rem 0.25rem;
        font-size: 0.7rem;
        text-align: center;
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 0.25rem;
    }
    
    .nav-tabs .nav-link i {
        font-size: 1.2rem;
        margin: 0;
    }
}

/* Enhanced Table Mobile View */
@media (max-width: 767.98px) {
    .table-mobile-stack {
        display: block;
    }
    
    .table-mobile-stack thead {
        display: none;
    }
    
    .table-mobile-stack tbody,
    .table-mobile-stack tr,
    .table-mobile-stack td {
        display: block;
        width: 100%;
    }
    
    .table-mobile-stack tr {
        border: 1px solid var(--gray-300);
        border-radius: var(--border-radius);
        margin-bottom: 1rem;
        padding: 1rem;
        background: var(--white);
        box-shadow: var(--shadow-sm);
    }
    
    .table-mobile-stack td {
        border: none;
        border-bottom: 1px solid var(--gray-200);
        position: relative;
        padding: 0.75rem 0 0.75rem 40%;
        text-align: left;
    }
    
    .table-mobile-stack td:last-child {
        border-bottom: none;
    }
    
    .table-mobile-stack td:before {
        content: attr(data-label);
        position: absolute;
        left: 0;
        width: 35%;
        padding-right: 10px;
        white-space: nowrap;
        font-weight: 600;
        color: var(--gray-700);
        font-size: 0.8rem;
    }
}

/* Enhanced Export Modal */
.advanced-pdf-export-modal {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        transform: translate(-50%, -60%);
        opacity: 0;
        scale: 0.95;
    }
    to {
        transform: translate(-50%, -50%);
        opacity: 1;
        scale: 1;
    }
}

.export-section {
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    margin-bottom: 1.5rem;
}

.export-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.section-title {
    color: var(--primary-color);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filter-subtitle {
    color: var(--gray-700);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filter-selection-container {
    background: var(--gray-100);
    border-radius: var(--border-radius);
    padding: 1rem;
}

.machine-types-grid,
.sites-grid {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius);
    padding: 0.75rem;
    background: var(--white);
}

.machine-types-grid::-webkit-scrollbar,
.sites-grid::-webkit-scrollbar {
    width: 6px;
}

.machine-types-grid .form-check,
.sites-grid .form-check {
    margin-bottom: 0.5rem;
    padding: 0.25rem 0;
}

.machine-types-grid .form-check:last-child,
.sites-grid .form-check:last-child {
    margin-bottom: 0;
}

.form-check-label {
    font-size: 0.9rem;
    color: var(--gray-700);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.form-check-input {
    margin-right: 0.5rem;
}

.form-check-input:checked {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
}

.badge.bg-light {
    background-color: var(--gray-200) !important;
    color: var(--gray-700) !important;
    padding: 0.2rem 0.5rem;
    border-radius: var(--border-radius);
    font-size: 0.7rem;
    font-weight: 500;
}

/* Enhanced Alert Styles */
.alert-info {
    background: linear-gradient(135deg, #e3f2fd, #bbdefb);
    border: 1px solid #90caf9;
    color: #1565c0;
    border-radius: var(--border-radius);
    padding: 1rem;
    margin-top: 1rem;
}

.alert-info i {
    color: #1976d2;
}

/* Enhanced Form Controls */
.form-control,
.form-select {
    font-size: 0.9rem;
    line-height: 1.5;
    transition: all 0.3s ease;
}

.form-control:hover,
.form-select:hover {
    border-color: var(--gray-600);
}

.form-floating > .form-control:focus ~ label,
.form-floating > .form-control:not(:placeholder-shown) ~ label,
.form-floating > .form-select ~ label {
    color: var(--secondary-color);
    font-weight: 600;
}

/* Enhanced Select2 Integration */
.select2-container {
    width: 100% !important;
}

.select2-container--bootstrap-5 .select2-selection__rendered {
    color: var(--gray-800) !important;
    line-height: 1.5 !important;
    padding-left: 0 !important;
    font-size: 0.9rem;
}

.select2-container--bootstrap-5 .select2-selection__placeholder {
    color: var(--gray-600) !important;
    font-style: italic;
}

.select2-container--bootstrap-5 .select2-selection__arrow {
    height: calc(2.25rem + 2px) !important;
    right: 12px !important;
}

.select2-dropdown {
    box-shadow: var(--shadow-md) !important;
    border-color: var(--secondary-color) !important;
}

.select2-results__option {
    padding: 0.5rem 0.75rem;
    font-size: 0.9rem;
}

.select2-results__option--highlighted {
    background-color: var(--secondary-color) !important;
    color: var(--white) !important;
}

/* Enhanced Mobile Responsiveness for Modals */
@media (max-width: 575.98px) {
    .advanced-pdf-export-modal {
        position: fixed !important;
        top: 0 !important;
        left: 0 !important;
        right: 0 !important;
        bottom: 0 !important;
        width: 100% !important;
        height: 100% !important;
        max-width: none !important;
        max-height: none !important;
        transform: none !important;
        border-radius: 0 !important;
        overflow-y: auto;
    }
    
    .export-section {
        padding-bottom: 1rem;
        margin-bottom: 1rem;
    }
    
    .machine-types-grid,
    .sites-grid {
        max-height: 150px;
    }
    
    .filter-selection-container {
        padding: 0.75rem;
    }
    
    .section-title {
        font-size: 1rem;
    }
    
    .filter-subtitle {
        font-size: 0.9rem;
    }
    
    .modal-dialog {
        margin: 0;
        width: 100%;
        max-width: none;
        height: 100%;
    }
    
    .modal-content {
        height: 100%;
        border-radius: 0;
    }
    
    .modal-header {
        padding: 1rem;
        position: sticky;
        top: 0;
        z-index: 1;
    }
    
    .modal-body {
        flex: 1;
        overflow-y: auto;
        padding: 1rem;
    }
    
    .modal-footer {
        padding: 1rem;
        position: sticky;
        bottom: 0;
        background: var(--white);
        border-top: 1px solid var(--gray-300);
        box-shadow: 0 -2px 8px rgba(0,0,0,0.1);
    }
}

/* Enhanced Button Groups */
.btn-group .btn-sm {
    border-radius: var(--border-radius);
    margin: 0 1px;
}

.btn-group .btn-sm:first-child {
    margin-left: 0;
}

.btn-group .btn-sm:last-child {
    margin-right: 0;
}

/* Enhanced Loading States */
.btn-custom.loading {
    position: relative;
    color: transparent !important;
}

.btn-custom.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 16px;
    margin-top: -8px;
    margin-left: -8px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Enhanced Tooltips */
[data-bs-toggle="tooltip"] {
    cursor: help;
}

.tooltip {
    font-size: 0.8rem;
}

.tooltip-inner {
    background-color: var(--gray-800);
    color: var(--white);
    border-radius: var(--border-radius);
    padding: 0.5rem 0.75rem;
    max-width: 200px;
}

/* Enhanced File Input */
.form-control[type="file"] {
    padding: 0.5rem;
    border: 2px dashed var(--gray-300);
    background: var(--gray-100);
    transition: var(--transition);
}

.form-control[type="file"]:hover {
    border-color: var(--secondary-color);
    background: var(--white);
}

.form-control[type="file"]:focus {
    border-color: var(--secondary-color);
    border-style: solid;
    background: var(--white);
}

/* Enhanced Search and Filter Section */
.search-filter-section {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
}

@media (max-width: 575.98px) {
    .search-filter-section {
        padding: 1rem;
        margin-bottom: 1rem;
    }
    
    .search-filter-section .row {
        gap: 0.75rem;
    }
    
    .search-filter-section .col-md-6,
    .search-filter-section .col-md-3 {
        width: 100%;
        margin-bottom: 0.75rem;
    }
}

/* Enhanced Statistics Cards */
.stats-container {
    margin-bottom: 2rem;
}

@media (max-width: 575.98px) {
    .stats-container {
        margin-bottom: 1rem;
    }
    
    .stats-container .col-md-3 {
        margin-bottom: 0.75rem;
    }
    
    .stats-container .col-md-3:last-child {
        margin-bottom: 0;
    }
}

.stats-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    border-radius: 2px;
    opacity: 0;
    transition: var(--transition);
}

.stats-card:hover::after {
    opacity: 1;
}

/* Enhanced Table Actions */
.actions-column .btn-group {
    display: flex;
    gap: 0.25rem;
}

@media (max-width: 575.98px) {
    .actions-column .btn-group {
        flex-direction: column;
        gap: 0.25rem;
        width: 100%;
    }
    
    .actions-column .btn {
        width: 100%;
        font-size: 0.7rem;
        padding: 0.25rem 0.5rem;
    }
}

/* Enhanced Bill Viewer */
.bill-viewer-content {
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius);
}

.bill-viewer-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.1) 50%, transparent 70%);
    transform: translateX(-100%);
    transition: transform 0.6s;
    pointer-events: none;
    z-index: 1;
}

.bill-viewer-content:hover::before {
    transform: translateX(100%);
}

/* Enhanced Transfer Timeline */
.transfer-timeline {
    position: relative;
    padding-left: 2rem;
}

.transfer-timeline::before {
    content: '';
    position: absolute;
    left: 10px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--secondary-color), var(--primary-color));
}

.transfer-timeline-item {
    position: relative;
    margin-bottom: 1.5rem;
}

.transfer-timeline-item::before {
    content: '';
    position: absolute;
    left: -25px;
    top: 5px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--secondary-color);
    border: 3px solid var(--white);
    box-shadow: var(--shadow-sm);
}

/* Enhanced Site Management */
.site-card {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.site-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, var(--info-color), var(--secondary-color));
}

.site-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.site-card h5 {
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.site-card .site-location {
    color: var(--gray-600);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.site-card .machine-count {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--gray-100);
    padding: 0.25rem 0.75rem;
    border-radius: var(--border-radius);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--gray-700);
}

/* Enhanced Import Section */
.import-card {
    background: var(--white);
    border: 2px dashed var(--secondary-color);
    border-radius: var(--border-radius-lg);
    padding: 3rem 2rem;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.import-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.05), rgba(44, 62, 80, 0.05));
    opacity: 0;
    transition: var(--transition);
}

.import-card:hover {
    border-style: solid;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.import-card:hover::before {
    opacity: 1;
}

.import-card h5 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-weight: 600;
}

.import-card p {
    color: var(--gray-600);
    margin-bottom: 1.5rem;
}

.import-card .btn {
    position: relative;
    z-index: 1;
}

/* Enhanced Progress Indicators */
.progress-custom {
    height: 8px;
    background-color: var(--gray-200);
    border-radius: var(--border-radius);
    overflow: hidden;
    position: relative;
}

.progress-bar-custom {
    height: 100%;
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    border-radius: var(--border-radius);
    transition: width 0.3s ease;
    position: relative;
}

.progress-bar-custom::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: progressShine 2s infinite;
}

@keyframes progressShine {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Enhanced Empty States */
.empty-state {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--gray-600);
}

.empty-state i {
    font-size: 3rem;
    color: var(--gray-400);
    margin-bottom: 1rem;
    display: block;
}

.empty-state h5 {
    color: var(--gray-700);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.empty-state p {
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

/* Enhanced Focus Management */
.focus-ring:focus {
    outline: 2px solid var(--secondary-color);
    outline-offset: 2px;
    border-radius: var(--border-radius);
}

/* Enhanced Keyboard Navigation */
.keyboard-nav:focus {
    background-color: var(--secondary-color);
    color: var(--white);
    outline: none;
}

/* Enhanced Error States */
.error-state {
    border-color: var(--danger-color) !important;
    background-color: rgba(231, 76, 60, 0.05);
}

.error-message {
    color: var(--danger-color);
    font-size: 0.8rem;
    margin-top: 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.error-message i {
    font-size: 0.9rem;
}

/* Enhanced Success States */
.success-state {
    border-color: var(--success-color) !important;
    background-color: rgba(39, 174, 96, 0.05);
}

.success-message {
    color: var(--success-color);
    font-size: 0.8rem;
    margin-top: 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.success-message i {
    font-size: 0.9rem;
}

/* Enhanced Skeleton Loading */
.skeleton {
    background: linear-gradient(90deg, var(--gray-200) 25%, var(--gray-300) 50%, var(--gray-200) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: var(--border-radius);
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.skeleton-text {
    height: 1rem;
    margin-bottom: 0.5rem;
}

.skeleton-text:last-child {
    margin-bottom: 0;
    width: 70%;
}

.skeleton-circle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.skeleton-button {
    height: 38px;
    width: 100px;
}

/* Final Responsive Adjustments */
@media (max-width: 575.98px) {
    /* Compact spacing for mobile */
    .mb-4 { margin-bottom: 1.5rem !important; }
    .mb-3 { margin-bottom: 1rem !important; }
    .mb-2 { margin-bottom: 0.75rem !important; }
    .p-4 { padding: 1.5rem !important; }
    .p-3 { padding: 1rem !important; }
    .p-2 { padding: 0.75rem !important; }
    
    /* Ensure touch targets are at least 44px */
    .btn, .nav-link, .page-link {
        min-height: 44px;
        min-width: 44px;
    }
    
    /* Improve text readability on mobile */
    body {
        font-size: 16px; /* Prevent zoom on iOS */
    }
    
    /* Stack form elements on mobile */
    .row.mb-3 .col-md-6,
    .row.mb-3 .col-md-3 {
        margin-bottom: 1rem;
    }
    
    .row.mb-3 .col-md-6:last-child,
    .row.mb-3 .col-md-3:last-child {
        margin-bottom: 0;
    }
}

/* Print-specific enhancements */
@media print {
    .stats-card {
        break-inside: avoid;
        margin-bottom: 1rem;
    }
    
    .table {
        font-size: 0.8rem;
    }
    
    .table th,
    .table td {
        padding: 0.5rem 0.25rem;
    }
    
    .badge-custom {
        border: 1px solid currentColor;
        background: transparent !important;
    }
}