/* ==============================================
   CSS Variables - Design System
   ============================================== */
:root {
    /* Primary Colors */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-quaternary: #475569;

    /* Text Colors */
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    /* Accent Colors */
    --accent-blue: #60a5fa;
    --accent-blue-hover: #3b82f6;
    --accent-blue-dark: #2563eb;

    /* Border Colors */
    --border-color: #334155;
    --border-color-light: #475569;

    /* Status Colors */
    --success-bg: #065f46;
    --success-text: #6ee7b7;
    --success-border: #10b981;
    --warning-bg: #78350f;
    --warning-text: #fcd34d;
    --warning-border: #f59e0b;
    --danger-bg: #7f1d1d;
    --danger-text: #fca5a5;
    --danger-border: #ef4444;
    --info-bg: #1e3a8a;
    --info-text: #93c5fd;
    --info-border: #3b82f6;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Bootstrap 5 Variable Overrides for Dark Theme */
    --bs-body-bg: #0f172a;
    --bs-body-color: #f1f5f9;
    --bs-border-color: #334155;
    --bs-border-color-translucent: rgba(51, 65, 85, 0.5);

    /* Table Variables */
    --bs-table-bg: #1e293b;
    --bs-table-color: #f1f5f9;
    --bs-table-border-color: #334155;
    --bs-table-striped-bg: #1e293b;
    --bs-table-striped-color: #f1f5f9;
    --bs-table-active-bg: #334155;
    --bs-table-active-color: #f1f5f9;
    --bs-table-hover-bg: #334155;
    --bs-table-hover-color: #f1f5f9;
}

/* ==============================================
   Global Styles
   ============================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Better focus styles for accessibility */
:focus-visible {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

/* ==============================================
   Typography
   ============================================== */
h1, h2, h3, h4, h5, h6 {
    color: var(--accent-blue);
    font-weight: 600;
    line-height: 1.3;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

/* Page titles */
.page-title {
    color: var(--accent-blue);
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 0;
}

/* ==============================================
   Navbar
   ============================================== */
.navbar-custom {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    border-bottom: 1px solid var(--border-color-light);
    padding: 0.875rem 0;
    box-shadow: var(--shadow-md);
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-blue) !important;
    letter-spacing: -0.5px;
    transition: color var(--transition-fast);
}

.navbar-brand:hover {
    color: var(--accent-blue-hover) !important;
}

.nav-link {
    color: var(--text-secondary) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--text-primary) !important;
    background-color: rgba(255, 255, 255, 0.05);
}

.nav-link.active {
    color: var(--accent-blue) !important;
    background-color: rgba(96, 165, 250, 0.1);
}

/* Dropdown menus */
.dropdown-menu {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 0.5rem;
}

.dropdown-item {
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.dropdown-item:hover,
.dropdown-item:focus {
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
}

.dropdown-divider {
    border-color: var(--border-color);
}

/* Navbar toggler for mobile */
.navbar-toggler {
    border-color: var(--border-color);
    padding: 0.5rem;
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28148, 163, 184, 1%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* ==============================================
   Container
   ============================================== */
.container-fluid {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem;
}

/* ==============================================
   Cards
   ============================================== */
.card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    background-color: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0 !important;
}

.card-header h5,
.card-header .card-title {
    color: var(--accent-blue);
    margin-bottom: 0;
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

.card-title {
    color: var(--accent-blue);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

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

/* ==============================================
   Stat Cards
   ============================================== */
.stat-card {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-blue);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-blue);
    line-height: 1.2;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 0.5rem;
    font-weight: 500;
}

/* ==============================================
   Buttons
   ============================================== */
.btn {
    font-weight: 500;
    border-radius: var(--radius-md);
    padding: 0.5rem 1rem;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

.btn:focus {
    box-shadow: 0 0 0 0.2rem rgba(96, 165, 250, 0.25);
}

/* Primary Button */
.btn-primary {
    background-color: var(--accent-blue-hover);
    border-color: var(--accent-blue-hover);
    color: #ffffff;
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--accent-blue-dark);
    border-color: var(--accent-blue-dark);
    color: #ffffff;
}

.btn-primary:active {
    background-color: #1d4ed8;
    border-color: #1d4ed8;
}

/* Secondary Button */
.btn-secondary {
    background-color: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover,
.btn-secondary:focus {
    background-color: var(--bg-quaternary);
    border-color: var(--border-color-light);
    color: var(--text-primary);
}

/* Success Button */
.btn-success {
    background-color: #22c55e;
    border-color: #22c55e;
    color: #ffffff;
}

.btn-success:hover,
.btn-success:focus {
    background-color: #16a34a;
    border-color: #16a34a;
    color: #ffffff;
}

/* Danger Button */
.btn-danger {
    background-color: #dc2626;
    border-color: #dc2626;
    color: #ffffff;
}

.btn-danger:hover,
.btn-danger:focus {
    background-color: #b91c1c;
    border-color: #b91c1c;
    color: #ffffff;
}

/* Warning Button */
.btn-warning {
    background-color: #f59e0b;
    border-color: #f59e0b;
    color: #000000;
}

.btn-warning:hover,
.btn-warning:focus {
    background-color: #d97706;
    border-color: #d97706;
    color: #000000;
}

/* Info Button */
.btn-info {
    background-color: #0ea5e9;
    border-color: #0ea5e9;
    color: #ffffff;
}

.btn-info:hover,
.btn-info:focus {
    background-color: #0284c7;
    border-color: #0284c7;
    color: #ffffff;
}

/* Outline Buttons */
.btn-outline-primary {
    color: var(--accent-blue);
    border-color: var(--accent-blue-hover);
}

.btn-outline-primary:hover,
.btn-outline-primary:focus {
    background-color: var(--accent-blue-hover);
    border-color: var(--accent-blue-hover);
    color: #ffffff;
}

.btn-outline-secondary {
    color: var(--text-secondary);
    border-color: var(--border-color);
}

.btn-outline-secondary:hover,
.btn-outline-secondary:focus {
    background-color: var(--bg-tertiary);
    border-color: var(--border-color-light);
    color: var(--text-primary);
}

.btn-outline-success {
    color: var(--success-border);
    border-color: var(--success-border);
}

.btn-outline-success:hover,
.btn-outline-success:focus {
    background-color: var(--success-border);
    border-color: var(--success-border);
    color: #ffffff;
}

.btn-outline-danger {
    color: var(--danger-border);
    border-color: var(--danger-border);
}

.btn-outline-danger:hover,
.btn-outline-danger:focus {
    background-color: var(--danger-border);
    border-color: var(--danger-border);
    color: #ffffff;
}

/* Button Sizes */
.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1.125rem;
}

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
    border-radius: var(--radius-sm);
}

/* Button Groups */
.btn-group .btn {
    border-radius: 0;
}

.btn-group .btn:first-child {
    border-top-left-radius: var(--radius-md);
    border-bottom-left-radius: var(--radius-md);
}

.btn-group .btn:last-child {
    border-top-right-radius: var(--radius-md);
    border-bottom-right-radius: var(--radius-md);
}

/* ==============================================
   Tables
   ============================================== */
.table {
    color: var(--text-primary);
    border-color: var(--border-color);
    margin-bottom: 0;
}

.table thead {
    background-color: var(--bg-tertiary);
}

.table thead th {
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
    padding: 1rem;
    border-bottom: 2px solid var(--border-color);
    white-space: nowrap;
}

.table tbody tr,
.table tbody tr.scan-row,
.table tbody tr.schedule-row {
    background-color: var(--bg-secondary) !important;
    border-color: var(--border-color) !important;
    transition: background-color var(--transition-fast);
}

.table tbody tr:hover {
    background-color: var(--bg-tertiary) !important;
}

.table th,
.table td {
    padding: 1rem;
    border-color: var(--border-color);
    vertical-align: middle;
}

.table-responsive {
    border-radius: var(--radius-md);
    overflow: hidden;
}

/* ==============================================
   Badges
   ============================================== */
.badge {
    padding: 0.35rem 0.75rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-expected,
.badge-good,
.badge-success {
    background-color: var(--success-bg);
    color: var(--success-text);
}

.badge-unexpected,
.badge-critical,
.badge-danger {
    background-color: var(--danger-bg);
    color: var(--danger-text);
}

.badge-missing,
.badge-warning {
    background-color: var(--warning-bg);
    color: var(--warning-text);
}

.badge-info {
    background-color: var(--info-bg);
    color: var(--info-text);
}

/* Bootstrap badge overrides */
.bg-success {
    background-color: var(--success-border) !important;
}

.bg-danger {
    background-color: var(--danger-border) !important;
}

.bg-warning {
    background-color: var(--warning-border) !important;
    color: #000 !important;
}

.bg-info {
    background-color: var(--info-border) !important;
}

.bg-secondary {
    background-color: var(--bg-quaternary) !important;
}

.bg-primary {
    background-color: var(--accent-blue-hover) !important;
}

/* ==============================================
   Alerts
   ============================================== */
.alert {
    border-radius: var(--radius-md);
    border: 1px solid;
    padding: 1rem 1.25rem;
    margin-bottom: 1rem;
}

.alert-success {
    background-color: var(--success-bg);
    border-color: var(--success-border);
    color: var(--success-text);
}

.alert-danger {
    background-color: var(--danger-bg);
    border-color: var(--danger-border);
    color: var(--danger-text);
}

.alert-warning {
    background-color: var(--warning-bg);
    border-color: var(--warning-border);
    color: var(--warning-text);
}

.alert-info {
    background-color: var(--info-bg);
    border-color: var(--info-border);
    color: var(--info-text);
}

.alert .btn-close {
    filter: invert(1) brightness(0.8);
}

.alert-link {
    color: inherit;
    text-decoration: underline;
    font-weight: 600;
}

/* ==============================================
   Form Controls
   ============================================== */
.form-control,
.form-select {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    padding: 0.625rem 0.875rem;
    transition: all var(--transition-fast);
}

.form-control:focus,
.form-select:focus {
    background-color: var(--bg-primary);
    border-color: var(--accent-blue);
    color: var(--text-primary);
    box-shadow: 0 0 0 0.2rem rgba(96, 165, 250, 0.25);
}

.form-control::placeholder {
    color: var(--text-muted);
}

.form-control:disabled,
.form-select:disabled {
    background-color: var(--bg-tertiary);
    opacity: 0.6;
}

.form-control-lg {
    padding: 0.75rem 1rem;
    font-size: 1.125rem;
}

.form-label {
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

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

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

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

.form-check-input:focus {
    box-shadow: 0 0 0 0.2rem rgba(96, 165, 250, 0.25);
    border-color: var(--accent-blue);
}

.form-check-label {
    color: var(--text-secondary);
}

/* Form switches */
.form-switch .form-check-input {
    width: 2.5rem;
    height: 1.25rem;
    margin-top: 0.125rem;
}

/* Required field indicator */
.text-danger {
    color: var(--danger-border) !important;
}

/* ==============================================
   Modals
   ============================================== */
.modal-content {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.modal-header {
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem 1.5rem;
}

.modal-title {
    color: var(--accent-blue);
    font-weight: 600;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    border-top: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
    gap: 0.5rem;
}

.btn-close {
    filter: invert(1) brightness(0.8);
    opacity: 0.5;
    transition: opacity var(--transition-fast);
}

.btn-close:hover {
    opacity: 1;
}

.modal-backdrop {
    background-color: rgba(0, 0, 0, 0.7);
}

/* ==============================================
   Pagination
   ============================================== */
.pagination {
    --bs-pagination-bg: var(--bg-secondary);
    --bs-pagination-border-color: var(--border-color);
    --bs-pagination-hover-bg: var(--bg-tertiary);
    --bs-pagination-hover-border-color: var(--border-color-light);
    --bs-pagination-focus-bg: var(--bg-tertiary);
    --bs-pagination-active-bg: var(--accent-blue-hover);
    --bs-pagination-active-border-color: var(--accent-blue-hover);
    --bs-pagination-disabled-bg: var(--bg-primary);
    --bs-pagination-disabled-border-color: var(--border-color);
    --bs-pagination-color: var(--text-secondary);
    --bs-pagination-hover-color: var(--text-primary);
    --bs-pagination-disabled-color: var(--text-muted);
}

.page-link {
    border-radius: var(--radius-sm);
    margin: 0 0.125rem;
    transition: all var(--transition-fast);
}

.page-item.active .page-link {
    color: #ffffff;
}

/* ==============================================
   Login Page
   ============================================== */
.login-card {
    max-width: 420px;
    margin: 5rem auto;
    padding: 2.5rem;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-xl);
}

.brand-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-blue);
    margin-bottom: 0.5rem;
}

.brand-subtitle {
    color: var(--text-muted);
    font-size: 1rem;
    margin-bottom: 0;
}

/* ==============================================
   Footer
   ============================================== */
.footer {
    margin-top: 3rem;
    padding: 1.5rem 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.footer a {
    color: var(--accent-blue);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer a:hover {
    color: var(--accent-blue-hover);
}

/* ==============================================
   Utility Classes
   ============================================== */
.text-muted {
    color: var(--text-secondary) !important;
}

.text-success {
    color: var(--success-border) !important;
}

.text-warning {
    color: var(--warning-border) !important;
}

.text-danger {
    color: var(--danger-border) !important;
}

.text-info {
    color: var(--accent-blue) !important;
}

.mono {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Courier New', monospace;
    font-size: 0.9em;
}

code {
    background-color: var(--bg-primary);
    color: var(--accent-blue);
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
    font-size: 0.875em;
}

/* Border utilities */
.border-bottom {
    border-bottom: 1px solid var(--border-color) !important;
}

/* ==============================================
   Spinners / Loading States
   ============================================== */
.spinner-border {
    color: var(--accent-blue);
}

.spinner-border-sm {
    width: 1rem;
    height: 1rem;
}

/* ==============================================
   Charts
   ============================================== */
.chart-container {
    position: relative;
    height: 300px;
    margin: 1rem 0;
}

canvas {
    max-width: 100%;
    height: auto;
}

/* ==============================================
   Empty States
   ============================================== */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
}

.empty-state i {
    font-size: 3rem;
    color: var(--text-muted);
    opacity: 0.5;
    margin-bottom: 1rem;
}

.empty-state h5 {
    color: var(--text-secondary);
}

.empty-state p {
    color: var(--text-muted);
}

/* ==============================================
   Notifications (Toast-like)
   ============================================== */
.notification {
    position: fixed;
    top: 1.25rem;
    right: 1.25rem;
    z-index: 9999;
    min-width: 300px;
    animation: slideIn 0.3s ease;
}

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

/* ==============================================
   Responsive Design
   ============================================== */
@media (max-width: 991.98px) {
    .navbar-collapse {
        background-color: var(--bg-secondary);
        padding: 1rem;
        border-radius: var(--radius-md);
        margin-top: 1rem;
        border: 1px solid var(--border-color);
    }

    .navbar-nav {
        gap: 0.25rem;
    }
}

@media (max-width: 767.98px) {
    .container-fluid {
        padding: 1rem;
    }

    h1 {
        font-size: 1.75rem;
    }

    .stat-value {
        font-size: 2rem;
    }

    .card-body {
        padding: 1rem;
    }

    .card-header {
        padding: 0.875rem 1rem;
    }

    .table th,
    .table td {
        padding: 0.75rem;
    }

    .btn-lg {
        padding: 0.625rem 1.25rem;
        font-size: 1rem;
    }

    .login-card {
        margin: 2rem 1rem;
        padding: 1.5rem;
    }

    .modal-dialog {
        margin: 0.5rem;
    }
}

@media (max-width: 575.98px) {
    .stat-card {
        padding: 1rem;
    }

    .stat-value {
        font-size: 1.75rem;
    }

    .stat-label {
        font-size: 0.75rem;
    }

    /* Stack action buttons on small screens */
    .btn-group {
        flex-direction: column;
    }

    .btn-group .btn {
        border-radius: var(--radius-sm) !important;
        margin-bottom: 0.25rem;
    }
}

/* ==============================================
   Print Styles
   ============================================== */
@media print {
    .navbar-custom,
    .footer,
    .btn,
    .pagination {
        display: none !important;
    }

    body {
        background: white;
        color: black;
    }

    .card {
        border: 1px solid #ddd;
        break-inside: avoid;
    }
}

/* ==============================================
   Accessibility Improvements
   ============================================== */
/* Ensure sufficient contrast for links */
a {
    color: var(--accent-blue);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--accent-blue-hover);
}

/* Skip to main content link (hidden by default) */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--accent-blue);
    color: white;
    padding: 0.5rem 1rem;
    z-index: 100;
    transition: top 0.3s;
}

.skip-link:focus {
    top: 0;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}