:root {
    --nucleus-bg-primary: #F7F8FA;
    --nucleus-bg-secondary: #FFFFFF;
    --nucleus-bg-tertiary: #F1F3F7;
    --nucleus-bg-quaternary: #E7EAF1;
    --nucleus-border: #E4E7EE;
    --nucleus-border-muted: #EDEFF4;
    --nucleus-text-primary: #1B2130;
    --nucleus-text-secondary: #4B5563;
    --nucleus-text-muted: #6B7280;
    --nucleus-accent-blue: #3BA5E4;
    --nucleus-accent-gold: #F09C2D;
    --nucleus-accent-gold-hover: #CC8426;
    --nucleus-accent-purple: #3D369F;
    --nucleus-accent-green: #047857;
    --nucleus-accent-orange: #F09C2D;
    --nucleus-accent-red: #F02F00;
    --nucleus-accent-yellow: #F09C2D;

    /* Priority colors */
    --priority-lowest: #64748B;
    --priority-low: #34D399;
    --priority-medium: #F0A340;
    --priority-high: #E8922D;
    --priority-highest: #E63B2E;

    /* Status colors */
    --status-todo: #64748B;
    --status-progress: #41B6E6;
    --status-review: #5A5FCF;
    --status-done: #34D399;

    /* Spacing system */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Typography */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 3rem;
    --tracking-tight: -0.01em;
    --tracking-wide: 0.05em;
    --font-longform: 'Merriweather', Georgia, serif;

    /* Brand references */
    --fc-brand-red: #F02F00;
    --fc-brand-orange: #F09C2D;
    --fc-brand-blue: #3BA5E4;
    --fc-brand-indigo: #3D369F;

    /* Soft brand washes, for tints/backgrounds rather than text/icons */
    --fc-soft-purple: #55509F;
    --fc-soft-red: #F04E27;
    --fc-soft-orange: #F0AD54;
    --fc-soft-blue: #60B3E4;

    /* Shadows (low-alpha, ink-tinted, for light surfaces) */
    --shadow-sm: 0 1px 3px rgba(27,33,48,0.06);
    --shadow-md: 0 6px 16px rgba(27,33,48,0.08);
    --shadow-lg: 0 12px 28px rgba(27,33,48,0.10);
    --shadow-xl: 0 20px 48px rgba(27,33,48,0.12);

    /* Border radius scale */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

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

    /* Extended spacing */
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
}

body {
    font-family: 'Open Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--nucleus-bg-primary);
    color: var(--nucleus-text-primary);
    font-size: var(--font-size-sm);
    line-height: 1.5;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Montserrat', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

::-webkit-scrollbar-track {
    background: var(--nucleus-bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--nucleus-bg-quaternary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--nucleus-border);
}

/* Focus indicators for accessibility */
*:focus,
*:focus-visible {
    outline: 2px solid var(--nucleus-accent-purple) !important;
    outline-offset: 2px !important;
}

/* Better focus for buttons */
.btn:focus,
.btn:focus-visible {
    outline: 2px solid var(--nucleus-accent-purple) !important;
    outline-offset: 2px !important;
    box-shadow: 0 0 0 3px rgba(61, 54, 159, 0.25) !important;
}

/* Better focus for form controls */
.form-control:focus,
.form-select:focus,
input:focus,
select:focus,
textarea:focus {
    outline: 2px solid var(--nucleus-accent-purple) !important;
    outline-offset: 0 !important;
    border-color: var(--nucleus-accent-purple) !important;
    box-shadow: 0 0 0 3px rgba(61, 54, 159, 0.25) !important;
}

/* Better focus for links */
a:focus,
a:focus-visible {
    outline: 2px solid var(--nucleus-accent-purple) !important;
    outline-offset: 2px !important;
    text-decoration: underline !important;
}

/* Focus for card elements */
.card:focus-within {
    border-color: var(--nucleus-accent-purple) !important;
    box-shadow: 0 0 0 3px rgba(61, 54, 159, 0.25) !important;
}

/* Navigation */
.navbar {
    background-color: rgba(255, 255, 255, 0.92) !important;
    border-bottom: 1px solid var(--nucleus-border);
    padding: var(--spacing-sm) 0;
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow-sm);
    z-index: 1030 !important; /* Below modals but above everything else */
}

.navbar-brand {
    font-family: 'Montserrat', -apple-system, BlinkMacSystemFont, sans-serif;
    font-weight: 700;
    font-size: var(--font-size-lg);
    color: var(--nucleus-accent-purple) !important;
}

.navbar-nav .nav-link {
    font-weight: 500;
    font-size: var(--font-size-sm);
    color: var(--nucleus-text-secondary) !important;
    padding: var(--spacing-xs) var(--spacing-md) !important;
    border-radius: 6px;
    transition: all 0.2s ease;
    margin: 0 var(--spacing-xs);
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    color: var(--nucleus-text-primary) !important;
    background-color: var(--nucleus-bg-tertiary);
}

.dropdown-menu {
    background-color: var(--nucleus-bg-tertiary);
    border: 1px solid var(--nucleus-border);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
}

.dropdown-item {
    color: var(--nucleus-text-secondary);
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm) var(--spacing-md);
}

.dropdown-item:hover {
    background-color: var(--nucleus-bg-quaternary);
    color: var(--nucleus-text-primary);
}

/* Cards */
.card {
    background-color: var(--nucleus-bg-secondary);
    border: 1px solid var(--nucleus-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

.card-header {
    background: linear-gradient(135deg, var(--nucleus-bg-tertiary), var(--nucleus-bg-secondary));
    border-bottom: 1px solid var(--nucleus-border);
    padding: var(--spacing-md);
    font-weight: 600;
    font-size: var(--font-size-sm);
    color: var(--nucleus-text-primary);
}

.card-body {
    padding: var(--spacing-md);
}

/* Buttons */
.btn {
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: 6px;
    padding: var(--spacing-sm) var(--spacing-md);
    transition: all var(--transition-fast);
    border-width: 1px;
}

.btn-sm {
    font-size: var(--font-size-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
}

.btn-primary {
    background-color: var(--nucleus-accent-purple);
    border-color: var(--nucleus-accent-purple);
    color: #fff;
    font-weight: 600;
}

.btn-primary:hover {
    background-color: #352F8B;
    border-color: #352F8B;
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(61,54,159,0.35);
}

.btn-outline-primary {
    color: var(--nucleus-accent-purple);
    border-color: var(--nucleus-accent-purple);
    background: transparent;
}

.btn-outline-primary:hover {
    background-color: var(--nucleus-accent-purple);
    color: #fff;
}

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

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

.btn-success {
    background-color: var(--nucleus-accent-green);
    border-color: var(--nucleus-accent-green);
    color: #fff;
}

.btn-danger {
    background-color: var(--nucleus-accent-red);
    border-color: var(--nucleus-accent-red);
    color: #fff;
}

/* Forms */
.form-control,
.form-select {
    background-color: var(--nucleus-bg-tertiary);
    border: 1px solid var(--nucleus-border);
    color: var(--nucleus-text-primary);
    font-size: var(--font-size-sm);
    border-radius: 6px;
    padding: var(--spacing-sm) var(--spacing-md);
}

.form-control:focus,
.form-select:focus {
    background-color: var(--nucleus-bg-tertiary);
    border-color: var(--nucleus-accent-purple);
    box-shadow: 0 0 0 3px rgba(61, 54, 159, 0.15);
    color: var(--nucleus-text-primary);
}

.form-label {
    color: var(--nucleus-text-primary);
    font-weight: 500;
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xs);
}

/* Tables */
.table {
    color: var(--nucleus-text-primary);
    font-size: var(--font-size-sm);
}

.table th {
    background-color: var(--nucleus-bg-tertiary);
    border-color: var(--nucleus-border);
    color: var(--nucleus-text-primary);
    font-weight: 600;
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: var(--spacing-sm) var(--spacing-md);
}

.table td {
    border-color: var(--nucleus-border-muted);
    padding: var(--spacing-sm) var(--spacing-md);
    vertical-align: middle;
}

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

/* Badges */
.badge {
    font-size: var(--font-size-xs);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
}

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

.badge.bg-info {
    background-color: var(--nucleus-accent-blue) !important;
    color: var(--nucleus-text-primary) !important;
}

.badge.bg-primary {
    background-color: var(--nucleus-accent-purple) !important;
    color: #FFFFFF !important;
}

.badge.bg-success {
    background-color: var(--nucleus-accent-green) !important;
    color: #FFFFFF !important;
}

.badge.bg-warning {
    background-color: var(--nucleus-accent-orange) !important;
    color: var(--nucleus-text-primary) !important;
}

.badge.bg-dark {
    background-color: var(--priority-lowest) !important;
    color: #FFFFFF !important;
}

.badge.bg-danger {
    background-color: var(--nucleus-accent-red) !important;
    color: #000000 !important;
}

/* Message styles (replacing alerts) */
.text-success { color: var(--nucleus-accent-green); }
.text-danger { color: var(--nucleus-accent-red); }
.text-warning { color: var(--nucleus-accent-yellow); }
.text-info { color: var(--nucleus-accent-blue); }

.border-success { border-color: var(--nucleus-accent-green) !important; }
.border-danger { border-color: var(--nucleus-accent-red) !important; }
.border-warning { border-color: var(--nucleus-accent-yellow) !important; }
.border-info { border-color: var(--nucleus-accent-blue) !important; }

/* Priority borders for tickets */
.priority-highest { border-left: 3px solid var(--priority-highest) !important; }
.priority-high { border-left: 3px solid var(--priority-high) !important; }
.priority-medium { border-left: 3px solid var(--priority-medium) !important; }
.priority-low { border-left: 3px solid var(--priority-low) !important; }
.priority-lowest { border-left: 3px solid var(--priority-lowest) !important; }

/* Ticket specific styles */
.ticket-card {
    transition: all 0.2s ease;
    cursor: pointer;
}

.ticket-card:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.ticket-key {
    font-family: ui-monospace, 'SFMono-Regular', Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--nucleus-text-muted);
}

/* Status badge colors */
.status-todo { background-color: var(--status-todo) !important; }
.status-progress { background-color: var(--status-progress) !important; }
.status-review { background-color: var(--status-review) !important; }
.status-done { background-color: var(--status-done) !important; }

/* Badge size variants */
.badge-compact { padding: 0.35rem 0.5rem; }
.badge-lg { font-size: 0.9rem; padding: 0.4rem 0.6rem; }

/* Metric cards (reports) */
.metric-card {
    background-color: var(--nucleus-bg-tertiary);
    border: 1px solid var(--nucleus-border);
    border-radius: 8px;
    padding: var(--spacing-md);
    text-align: center;
    height: 100%;
    transition: all 0.2s ease;
}

.metric-card:hover {
    border-color: var(--nucleus-accent-gold);
}

.metric-card .metric-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--nucleus-text-primary);
    margin-bottom: var(--spacing-xs);
}

.metric-card .metric-label {
    font-size: var(--font-size-xs);
    color: var(--nucleus-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.metric-box {
    background-color: var(--nucleus-bg-quaternary);
    border-radius: 6px;
    padding: var(--spacing-md);
}

.metric-box .metric-value {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--nucleus-text-primary);
}

.metric-box .metric-label {
    font-size: var(--font-size-xs);
    color: var(--nucleus-text-muted);
    text-transform: uppercase;
    margin-top: var(--spacing-xs);
}

/* Compact spacing utilities */
.compact { line-height: 1.3; }
.compact-sm { line-height: 1.2; }

/* Typography utilities */
.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }

/* Main content adjustments */
main {
    min-height: calc(100vh - 60px);
}

/* Sidebar Navigation */
.sidebar {
    position: fixed;
    top: 60px;
    left: 0;
    width: 250px;
    height: calc(100vh - 60px);
    background-color: var(--nucleus-bg-secondary);
    border-right: 1px solid var(--nucleus-border);
    overflow-y: auto;
    transition: transform 0.3s ease;
    z-index: 100;
}

.sidebar-header {
    padding: var(--spacing-lg) var(--spacing-md) var(--spacing-md);
    border-bottom: 1px solid var(--nucleus-border);
    background: linear-gradient(180deg, rgba(61,54,159,0.06), transparent);
}

.sidebar-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--nucleus-text-primary);
    margin: 0;
}

.sidebar-nav {
    padding: var(--spacing-md) 0;
}

.sidebar-section {
    margin-bottom: var(--spacing-lg);
}

.sidebar-section-title {
    font-family: 'Montserrat', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--nucleus-text-muted);
    padding: var(--spacing-xs) var(--spacing-md);
    margin-bottom: var(--spacing-xs);
}

.sidebar-link {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--nucleus-text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
    font-size: var(--font-size-sm);
    border-left: 3px solid transparent;
}

.sidebar-link:hover {
    background-color: var(--nucleus-bg-tertiary);
    color: var(--nucleus-text-primary);
    border-left-color: var(--nucleus-accent-purple);
}

.sidebar-link.active {
    background-color: var(--nucleus-bg-tertiary);
    color: var(--nucleus-accent-purple);
    border-left-color: var(--nucleus-accent-purple);
}

.sidebar-link i {
    width: 20px;
    margin-right: var(--spacing-sm);
}

.sidebar-link .badge {
    margin-left: auto;
}

.sidebar-toggle {
    display: none;
    color: var(--nucleus-text-secondary);
}

.main-content {
    margin-left: 250px;
    min-height: calc(100vh - 60px);
    transition: margin-left 0.3s ease;
    position: relative;
    z-index: 1;
}

.main-content.full-width {
    margin-left: 0;
}

/* Applied only when the navbar is actually rendered (user.is_authenticated) --
   anonymous pages have no fixed-top navbar, so they get no clearance. */
.main-content.with-navbar {
    margin-top: 60px;
    padding-top: 20px;
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.show {
        transform: translateX(0);
    }

    .sidebar-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .main-content {
        margin-left: 0;
    }
}

/* Landing page specific styles */
.feature-icon {
    color: var(--nucleus-accent-gold);
    font-size: var(--font-size-2xl);
}

/* Login page styles */
.login-container {
    background: var(--nucleus-bg-primary);
    min-height: 100vh;
}

.login-card {
    background-color: var(--nucleus-bg-secondary);
    border: 1px solid var(--nucleus-border);
}

/* Breadcrumb */
.breadcrumb {
    background: none;
    padding: 0;
    margin: 0;
    font-size: var(--font-size-sm);
}

.breadcrumb-item + .breadcrumb-item::before {
    color: var(--nucleus-text-muted);
}

.breadcrumb-item a {
    color: var(--nucleus-text-secondary);
    text-decoration: none;
}

.breadcrumb-item a:hover {
    color: var(--nucleus-accent-purple);
}

.breadcrumb-item.active {
    color: var(--nucleus-text-muted);
}

/* Modal overrides */
.modal {
    z-index: 1055 !important; /* Above navbar */
}

.modal-backdrop {
    z-index: 1054 !important; /* Just below modal */
}

.modal-content {
    background-color: var(--nucleus-bg-secondary);
    border: 1px solid var(--nucleus-border);
}

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

.modal-footer {
    border-top: 1px solid var(--nucleus-border);
    background-color: var(--nucleus-bg-tertiary);
}

/* Shared sub-app nav bar (plan_track, docs) */
.app-subnav {
    background-color: var(--nucleus-bg-tertiary);
    border-bottom: 1px solid var(--nucleus-border);
    padding: var(--spacing-md) 0;
    margin-bottom: 0;
}

.app-subnav .nav-link {
    color: var(--nucleus-text-secondary) !important;
    font-weight: 500;
    font-size: var(--font-size-sm);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 6px;
    margin: 0 var(--spacing-xs);
    transition: all var(--transition-fast);
}

.app-subnav .nav-link:hover,
.app-subnav .nav-link.active {
    color: var(--nucleus-text-primary) !important;
    background-color: var(--nucleus-bg-quaternary);
}

/* Compact list styles */
.list-compact {
    margin: 0;
    padding: 0;
}

.list-compact li {
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid var(--nucleus-border-muted);
}

.list-compact li:last-child {
    border-bottom: none;
}

.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

/* Page header */
.page-header {
    background-color: var(--nucleus-bg-secondary);
    border-bottom: 1px solid var(--nucleus-border);
    padding: var(--spacing-md) 0;
    margin-bottom: var(--spacing-lg);
}

.page-header h1 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin: 0;
    color: var(--nucleus-text-primary);
}

.page-header .subtitle {
    color: var(--nucleus-text-secondary);
    font-size: var(--font-size-sm);
    margin: var(--spacing-xs) 0 0 0;
}

/* HTMX indicator: scoped, per-element spinners shown only while their own
   request is in flight (see base-core.js showToast for cross-page feedback;
   full-viewport blocking overlay was removed in NUC-943). */
.htmx-indicator {
    display: none;
}

.htmx-request .htmx-indicator {
    display: inline-block;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .container-fluid {
        padding-left: var(--spacing-md);
        padding-right: var(--spacing-md);
    }

    .btn-toolbar {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .btn-group {
        width: 100%;
    }
}

/* Keyboard shortcuts modal <kbd> styling */
kbd {
    background-color: var(--nucleus-bg-tertiary);
    border: 1px solid var(--nucleus-border);
    border-radius: 3px;
    padding: 2px 6px;
    font-family: monospace;
    font-size: 0.875em;
}