/* Telegram Channel Agent - Modern Theme System */

:root {
    /* Light theme colors */
    --primary-color: #0088cc;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    
    /* Light theme backgrounds */
    --bs-body-bg: #ffffff;
    --bs-body-color: #212529;
    --bs-card-bg: #ffffff;
    --bs-border-color: #dee2e6;
    --bs-secondary-bg: #f8f9fa;
    --bs-tertiary-bg: #e9ecef;
    --bs-emphasis-color: #000;
    
    /* Light theme text */
    --bs-text-muted: #6c757d;
    --bs-link-color: #0088cc;
    --bs-link-hover-color: #006699;
    
    /* Light theme shadows */
    --bs-box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --bs-box-shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --bs-box-shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
    
    /* Sidebar */
    --sidebar-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --sidebar-text: rgba(255, 255, 255, 0.8);
    --sidebar-hover: rgba(255, 255, 255, 0.1);
    --sidebar-active: rgba(255, 255, 255, 0.2);
    
    /* Transitions */
    --transition-base: all 0.3s ease;
    --transition-fast: all 0.15s ease;
}

/* Dark theme variables */
[data-bs-theme="dark"] {
    /* Dark theme colors */
    --primary-color: #60a5fa;
    --secondary-color: #9ca3af;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #06b6d4;
    --light-color: #374151;
    --dark-color: #f9fafb;
    
    /* Dark theme backgrounds */
    --bs-body-bg: #0f172a;
    --bs-body-color: #f1f5f9;
    --bs-card-bg: #1e293b;
    --bs-border-color: #334155;
    --bs-secondary-bg: #334155;
    --bs-tertiary-bg: #475569;
    --bs-emphasis-color: #fff;
    
    /* Dark theme text */
    --bs-text-muted: #94a3b8;
    --bs-link-color: #60a5fa;
    --bs-link-hover-color: #93c5fd;
    
    /* Dark theme shadows */
    --bs-box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.3);
    --bs-box-shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.3);
    --bs-box-shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.4);
    
    /* Dark sidebar */
    --sidebar-bg: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    --sidebar-text: rgba(241, 245, 249, 0.8);
    --sidebar-hover: rgba(241, 245, 249, 0.1);
    --sidebar-active: rgba(241, 245, 249, 0.2);
}

/* Base styles */
* {
    transition: var(--transition-fast);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bs-body-bg);
    color: var(--bs-body-color);
    line-height: 1.6;
}

/* Sidebar */
.sidebar {
    min-height: 100vh;
    background: var(--sidebar-bg);
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
    position: relative;
    z-index: 1000;
}

.sidebar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    pointer-events: none;
}

.sidebar .nav-link {
    color: var(--sidebar-text);
    padding: 12px 20px;
    margin: 2px 8px;
    border-radius: 12px;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.sidebar .nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s;
}

.sidebar .nav-link:hover::before {
    left: 100%;
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
    color: white;
    background-color: var(--sidebar-hover);
    transform: translateX(4px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.sidebar .nav-link i {
    margin-right: 12px;
    width: 20px;
    text-align: center;
    font-size: 1.1em;
}

.sidebar .nav-link.active {
    background-color: var(--sidebar-active);
    font-weight: 600;
}

/* Main content */
.main-content {
    background-color: var(--bs-body-bg);
    min-height: 100vh;
    padding: 2rem;
}

/* Cards */
.card {
    border: none;
    border-radius: 16px;
    box-shadow: var(--bs-box-shadow);
    background-color: var(--bs-card-bg);
    color: var(--bs-body-color);
    transition: var(--transition-base);
    overflow: hidden;
    position: relative;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--info-color));
    opacity: 0;
    transition: var(--transition-base);
}

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

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

.card-header {
    background-color: var(--bs-tertiary-bg);
    border-bottom: 1px solid var(--bs-border-color);
    padding: 1.5rem;
    font-weight: 600;
    color: var(--bs-body-color);
}

.card-body {
    padding: 1.5rem;
}

/* Stats cards */
.stats-card {
    border-left: 4px solid var(--primary-color);
    background: linear-gradient(135deg, var(--bs-card-bg) 0%, var(--bs-secondary-bg) 100%);
    position: relative;
    overflow: hidden;
}

/* Fix for flex-shrink-0 circular icons */
.stats-card .flex-shrink-0 {
    min-width: 60px;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.stats-card .flex-shrink-0 .rounded-circle {
    width: 60px;
    height: 60px;
    min-width: 60px;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

/* Make all icons in flex-shrink-0 circles white */
.stats-card .flex-shrink-0 .rounded-circle i {
    color: white !important;
    font-size: 1.5rem;
}

/* Telegram logo container */
.telegram-logo-container {
    display: flex;
    justify-content: center;
    align-items: center;
}

.telegram-logo-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #0088cc 0%, #00a8ff 100%);
    border-radius: 50%;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 136, 204, 0.3);
}

.telegram-logo-link:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(0, 136, 204, 0.4);
    text-decoration: none;
}

.telegram-logo-link i {
    font-size: 1.5rem;
    color: white !important;
}

.stats-card::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(0, 136, 204, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.stats-card .h5 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--bs-body-color);
    margin-bottom: 0.5rem;
}

.stats-card .text-xs {
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--bs-text-muted);
}

/* Ensure proper flex layout for stats cards */
.stats-card .d-flex {
    gap: 1rem;
    align-items: center;
}

.stats-card .flex-grow-1 {
    flex: 1 1 auto;
    min-width: 0;
}

/* Channel cards */
.channel-card {
    transition: var(--transition-base);
    border: 1px solid var(--bs-border-color);
    background-color: var(--bs-card-bg);
    position: relative;
    overflow: hidden;
}

.channel-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0, 136, 204, 0.05) 0%, rgba(0, 136, 204, 0.02) 100%);
    opacity: 0;
    transition: var(--transition-base);
}

.channel-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--bs-box-shadow-lg);
    border-color: var(--primary-color);
}

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

/* Buttons */
.btn {
    border-radius: 12px;
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
    border: none;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, #006699 100%);
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #006699 0%, var(--primary-color) 100%);
    color: white;
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color) 0%, #1e7e34 100%);
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger-color) 0%, #c82333 100%);
    color: white;
}

.btn-warning {
    background: linear-gradient(135deg, var(--warning-color) 0%, #e0a800 100%);
    color: #000;
}

.btn-info {
    background: linear-gradient(135deg, var(--info-color) 0%, #138496 100%);
    color: white;
}

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary-color) 0%, #545b62 100%);
    color: white;
}

/* Outline buttons */
.btn-outline-primary {
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    background: transparent;
}

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

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

.btn-outline-success:hover {
    background: var(--success-color);
    color: white;
}

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

.btn-outline-danger:hover {
    background: var(--danger-color);
    color: white;
}

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

.btn-outline-warning:hover {
    background: var(--warning-color);
    color: #000;
}

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

.btn-outline-info:hover {
    background: var(--info-color);
    color: white;
}

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

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

/* Tables */
.table {
    background-color: var(--bs-card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--bs-box-shadow);
}

.table thead th {
    background-color: var(--bs-tertiary-bg);
    border: none;
    font-weight: 600;
    color: var(--bs-body-color);
    padding: 1.25rem 1rem;
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 0.5px;
}

.table tbody td {
    padding: 1.25rem 1rem;
    border-color: var(--bs-border-color);
    vertical-align: middle;
    color: var(--bs-body-color);
}

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

.table tbody tr:hover {
    background-color: var(--bs-secondary-bg);
    transform: scale(1.01);
}

/* Forms */
.form-control,
.form-select {
    border-radius: 12px;
    border: 2px solid var(--bs-border-color);
    padding: 0.875rem 1rem;
    background-color: var(--bs-secondary-bg);
    color: var(--bs-body-color);
    transition: var(--transition-base);
    font-size: 0.95rem;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(0, 136, 204, 0.15);
    background-color: var(--bs-card-bg);
    color: var(--bs-body-color);
}

.form-label {
    font-weight: 600;
    color: var(--bs-body-color);
    margin-bottom: 0.5rem;
}

.form-text {
    color: var(--bs-text-muted);
    font-size: 0.875rem;
}

/* Modals */
.modal-content {
    border: none;
    border-radius: 20px;
    box-shadow: var(--bs-box-shadow-lg);
    background-color: var(--bs-card-bg);
    color: var(--bs-body-color);
    overflow: hidden;
}

.modal-header {
    border-bottom: 1px solid var(--bs-border-color);
    background-color: var(--bs-tertiary-bg);
    padding: 1.5rem;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    border-top: 1px solid var(--bs-border-color);
    background-color: var(--bs-secondary-bg);
    padding: 1.5rem;
}

/* Error Popup Modal */
#errorPopupModal .modal-dialog {
    max-width: 500px;
}

#errorPopupModal .modal-content {
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
}

#errorPopupModal .modal-header {
    background: linear-gradient(135deg, rgba(220, 53, 69, 0.1) 0%, rgba(220, 53, 69, 0.05) 100%);
    border-bottom: 2px solid rgba(220, 53, 69, 0.2);
}

[data-bs-theme="dark"] #errorPopupModal .modal-header {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.15) 0%, rgba(239, 68, 68, 0.08) 100%);
    border-bottom: 2px solid rgba(239, 68, 68, 0.3);
}

#errorPopupModal .modal-title {
    font-weight: 600;
    font-size: 1.25rem;
    color: var(--danger-color);
}

#errorPopupModal .modal-body {
    padding: 1.5rem;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--bs-body-color);
}

#errorPopupModal .modal-body p {
    margin: 0;
    word-wrap: break-word;
}

#errorPopupModal .modal-body a {
    color: var(--primary-color);
    text-decoration: underline;
    transition: var(--transition-fast);
}

#errorPopupModal .modal-body a:hover {
    color: var(--bs-link-hover-color);
    text-decoration: underline;
}

[data-bs-theme="dark"] #errorPopupModal .modal-body a {
    color: var(--primary-color);
}

[data-bs-theme="dark"] #errorPopupModal .modal-body a:hover {
    color: #93c5fd;
}

#errorPopupModal .modal-footer {
    background-color: var(--bs-card-bg);
    border-top: 1px solid var(--bs-border-color);
    padding: 1rem 1.5rem;
}

#errorPopupModal .btn-primary {
    min-width: 120px;
    border-radius: 8px;
    font-weight: 500;
    padding: 0.5rem 1.5rem;
}

#errorPopupModal .btn-close {
    filter: var(--bs-btn-close-white-filter);
}

[data-bs-theme="dark"] #errorPopupModal .btn-close {
    filter: invert(1) grayscale(100%) brightness(200%);
}

/* Alerts */
.alert {
    border: none;
    border-radius: 12px;
    padding: 1rem 1.5rem;
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
}

.alert::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: currentColor;
}

.alert-primary {
    background-color: rgba(0, 136, 204, 0.1);
    color: var(--primary-color);
    border-left: 4px solid var(--primary-color);
}

.alert-success {
    background-color: rgba(40, 167, 69, 0.1);
    color: var(--success-color);
    border-left: 4px solid var(--success-color);
}

.alert-danger {
    background-color: rgba(220, 53, 69, 0.1);
    color: var(--danger-color);
    border-left: 4px solid var(--danger-color);
}

.alert-warning {
    background-color: rgba(255, 193, 7, 0.1);
    color: var(--warning-color);
    border-left: 4px solid var(--warning-color);
}

.alert-info {
    background-color: rgba(23, 162, 184, 0.1);
    color: var(--info-color);
    border-left: 4px solid var(--info-color);
}

/* Badges */
.badge {
    font-size: 0.75rem;
    padding: 0.5rem 0.75rem;
    border-radius: 20px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.bg-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, #006699 100%) !important;
}

.bg-success {
    background: linear-gradient(135deg, var(--success-color) 0%, #1e7e34 100%) !important;
}

.bg-danger {
    background: linear-gradient(135deg, var(--danger-color) 0%, #c82333 100%) !important;
}

.bg-warning {
    background: linear-gradient(135deg, var(--warning-color) 0%, #e0a800 100%) !important;
    color: #000 !important;
}

.bg-info {
    background: linear-gradient(135deg, var(--info-color) 0%, #138496 100%) !important;
}

.bg-secondary {
    background: linear-gradient(135deg, var(--secondary-color) 0%, #545b62 100%) !important;
}

/* Status badges */
.status-badge {
    font-size: 0.7rem;
    padding: 0.4rem 0.8rem;
    border-radius: 15px;
    font-weight: 600;
}

/* Loading states */
.spinner-border {
    color: var(--primary-color);
    width: 2rem;
    height: 2rem;
}

.spinner-grow {
    color: var(--primary-color);
    width: 2rem;
    height: 2rem;
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(0, 136, 204, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

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

/* Theme toggle button */
.theme-toggle {
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    color: white;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-base);
    backdrop-filter: blur(10px);
    margin: 0 auto;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
    color: white;
}

/* Charts */
.chart-container {
    position: relative;
    height: 300px;
    margin: 1rem 0;
    background-color: var(--bs-card-bg);
    border-radius: 12px;
    padding: 1rem;
}

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

::-webkit-scrollbar-track {
    background: var(--bs-secondary-bg);
    border-radius: 4px;
}

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

::-webkit-scrollbar-thumb:hover {
    background: #006699;
}

/* Responsive adjustments */
@media (max-width: 767.98px) {
    .sidebar {
        min-height: 100vh;
        position: fixed;
        top: 0;
        left: 0;
        width: 280px;
        transform: translateX(-100%);
        transition: transform 0.3s ease-in-out;
        z-index: 1040;
        overflow-y: auto;
    }
    
    .sidebar.show {
        transform: translateX(0);
    }
    
    .sidebar-backdrop {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 1030;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.3s ease-in-out, visibility 0.3s ease-in-out;
    }
    
    .sidebar-backdrop.show {
        opacity: 1;
        visibility: visible;
    }
    
    .main-content {
        padding: 1rem;
        width: 100%;
        margin-left: 0 !important;
    }
    
    .stats-card .h5 {
        font-size: 2rem;
    }
    
    .card {
        margin-bottom: 1rem;
    }
    
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
    
    .page-header {
        padding-bottom: 0.75rem;
        margin-bottom: 1.5rem;
    }
    
    .page-title {
        font-size: 1.5rem;
    }
    
    .action-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .action-buttons .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }
}

@media (max-width: 576px) {
    .main-content {
        padding: 0.5rem;
    }
    
    .stats-card .h5 {
        font-size: 1.5rem;
    }
    
    .table-responsive {
        border-radius: 12px;
    }
}

/* Print styles */
@media print {
    .sidebar,
    .theme-toggle,
    .btn {
        display: none !important;
    }
    
    .main-content {
        margin: 0;
        padding: 0;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #000;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --bs-border-color: #000;
        --bs-text-muted: #000;
    }
    
    [data-bs-theme="dark"] {
        --bs-border-color: #fff;
        --bs-text-muted: #fff;
    }
}

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

/* Focus styles for accessibility */
.btn:focus,
.form-control:focus,
.form-select:focus,
.nav-link:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Selection styles */
::selection {
    background-color: var(--primary-color);
    color: white;
}

::-moz-selection {
    background-color: var(--primary-color);
    color: white;
}

/* References section styles */
.references-section {
    margin-top: 1.5rem;
    padding: 1rem;
    border-radius: 0.5rem;
    background-color: var(--bs-secondary-bg);
    border: 1px solid var(--bs-border-color);
}

.references-section h6 {
    color: var(--bs-body-color);
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.references-section .text-muted {
    color: var(--bs-text-muted);
    font-size: 0.875rem;
}

.reference-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    border: 1px solid var(--bs-border-color);
    border-radius: 0.375rem;
    background-color: var(--bs-card-bg);
    transition: var(--transition-fast);
}

.reference-item:hover {
    background-color: var(--bs-tertiary-bg);
    border-color: var(--primary-color);
}

.reference-item .reference-info {
    flex-grow: 1;
    min-width: 0;
}

.reference-item .reference-info small {
    display: block;
    color: var(--bs-text-muted);
    word-break: break-word;
}

.reference-item .btn-sm {
    flex-shrink: 0;
    margin-left: 0.5rem;
}

/* File input styles for references */
.references-section .input-group {
    margin-bottom: 0.75rem;
}

.references-section .form-control[type="file"] {
    cursor: pointer;
}

.references-section .form-control[type="file"]::-webkit-file-upload-button {
    padding: 0.375rem 0.75rem;
    margin-right: 0.5rem;
    background-color: var(--bs-secondary-bg);
    border: 1px solid var(--bs-border-color);
    border-radius: 0.25rem;
    color: var(--bs-body-color);
    cursor: pointer;
    transition: var(--transition-fast);
}

.references-section .form-control[type="file"]::-webkit-file-upload-button:hover {
    background-color: var(--bs-tertiary-bg);
    border-color: var(--primary-color);
}

/* Responsive styles for references */
@media (max-width: 768px) {
    .reference-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .reference-item .btn-sm {
        margin-left: 0;
        margin-top: 0.5rem;
        width: 100%;
    }
    
    .references-section .input-group {
        flex-direction: column;
    }
    
    .references-section .input-group .form-control {
        margin-bottom: 0.5rem;
    }
    
    .references-section .input-group .btn {
        width: 100%;
    }
    
    /* Error Popup Modal - Mobile */
    #errorPopupModal .modal-dialog {
        margin: 1rem;
        max-width: calc(100% - 2rem);
    }
    
    #errorPopupModal .modal-content {
        border-radius: 12px;
    }
    
    #errorPopupModal .modal-header {
        padding: 1rem;
    }
    
    #errorPopupModal .modal-title {
        font-size: 1.1rem;
    }
    
    #errorPopupModal .modal-body {
        padding: 1rem;
        font-size: 0.95rem;
    }
    
    #errorPopupModal .modal-footer {
        padding: 0.75rem 1rem;
        flex-direction: column;
    }
    
    #errorPopupModal .btn-primary {
        width: 100%;
        margin: 0;
    }
}