:root {
    /* Text sizes */
    --text-xs: 0.6875rem;
    --text-sm: 0.8125rem;
    --text-base: 0.875rem;
    --text-md: 0.9375rem;
    --text-lg: 1.0625rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;

    --color-primary: #0b3b54;
    --color-primary-light: #124d6b;
    --color-primary-dark: #072a3d;
    --color-primary-subtle: #e8f1f6;

    --color-accent: #c49a50;
    --color-accent-light: #d4b06a;
    --color-accent-subtle: #faf3e8;

    --color-surface: #ffffff;
    --color-background: #f1f4f8;
    --color-background-hover: #e8ecf1;
    --color-border: #e2e8f0;
    --color-border-strong: #cbd5e1;

    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-tertiary: #94a3b8;
    --color-text-inverse: #ffffff;

    --color-success: #16a34a;
    --color-success-subtle: #dcfce7;
    --color-warning: #d97706;
    --color-warning-subtle: #fef3c7;
    --color-danger: #dc2626;
    --color-danger-subtle: #fee2e2;
    --color-info: #0284c7;
    --color-info-subtle: #e0f2fe;

    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);

    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;

    --font-sans: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
    --font-mono: "JetBrains Mono", "Fira Code", "Cascadia Code", Consolas, monospace;

    --sidebar-width: 260px;
    --topbar-height: 56px;
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;

    --sidebar-teal: var(--color-primary);
    --sidebar-dark: var(--color-primary-dark);
    --accent-gold: var(--color-accent);
    --bg-light: var(--color-background);
    --text-muted: var(--color-text-secondary);
    --header-bg: var(--color-primary-dark);
    --primary-color: var(--color-primary);
    --success-color: var(--color-success);
    --warning-color: var(--color-warning);
    --danger-color: var(--color-danger);
}

/* --- Layout Shell --- */
.app-layout {
    display: flex;
    min-height: 100vh;
}

/* --- Sidebar --- */
.sidebar {
    width: var(--sidebar-width);
    background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-text-inverse);
    position: fixed;
    height: 100vh;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.sidebar-brand {
    padding: var(--space-6) var(--space-5);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar-brand-logo {
    width: 36px;
    height: 36px;
    background: var(--color-accent);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--text-lg);
    flex-shrink: 0;
    color: var(--color-text-inverse);
}

.sidebar-brand-text {
    font-size: var(--text-md);
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--color-text-inverse);
}

.sidebar-brand-sub {
    font-size: var(--text-xs);
    color: rgba(255, 255, 255, 0.5);
    font-weight: 400;
}

.sidebar-nav {
    padding: var(--space-4) 0;
    flex: 1;
}

.nav-section-label {
    padding: var(--space-3) var(--space-5);
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: rgba(255, 255, 255, 0.35);
    margin-top: var(--space-2);
}

.sidebar-footer {
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar-user {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.sidebar-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--color-primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-inverse);
}

.sidebar-user-info {
    flex: 1;
    min-width: 0;
}

.sidebar-user-name {
    font-size: var(--text-sm);
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--color-text-inverse);
}

.sidebar-user-role {
    font-size: var(--text-xs);
    color: rgba(255, 255, 255, 0.45);
}

/* --- Top Bar --- */
.topbar {
    position: fixed;
    top: 0;
    left: var(--sidebar-width);
    right: 0;
    height: var(--topbar-height);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    padding: 0 var(--space-6);
    z-index: 999;
}

.topbar-breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

.topbar-breadcrumb a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.topbar-breadcrumb a:hover {
    color: var(--color-text);
}

.topbar-breadcrumb .separator {
    color: var(--color-text-tertiary);
    font-size: var(--text-xs);
}

.topbar-breadcrumb .current {
    color: var(--color-text);
    font-weight: 500;
}

.topbar-actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.topbar-company-select {
    appearance: none;
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 6px 32px 6px 12px;
    font-size: var(--text-sm);
    font-family: var(--font-sans);
    color: var(--color-text);
    cursor: pointer;
    min-width: 200px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M2.5 4.5L6 8l3.5-3.5'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    transition: border-color var(--transition-fast);
}

.topbar-company-select:focus {
    outline: none;
    border-color: var(--color-primary-light);
    box-shadow: 0 0 0 3px var(--color-primary-subtle);
}

.topbar-icon-btn {
    width: 36px;
    height: 36px;
    border: none;
    background: transparent;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}

.topbar-icon-btn:hover {
    background: var(--color-background);
    color: var(--color-text);
}

.topbar-icon-btn .notification-dot {
    position: absolute;
    top: 7px;
    right: 7px;
    width: 7px;
    height: 7px;
    background: var(--color-danger);
    border-radius: 50%;
    border: 2px solid var(--color-surface);
}

.topbar-divider {
    width: 1px;
    height: 24px;
    background: var(--color-border);
    margin: 0 var(--space-2);
}

.topbar-user {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 4px 8px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.topbar-user:hover {
    background: var(--color-background);
}

.topbar-user-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: var(--color-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xs);
    font-weight: 600;
}

.topbar-user-name {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text);
}

/* --- Main Content Area --- */
.main-content {
    margin-left: var(--sidebar-width);
    margin-top: var(--topbar-height);
    padding: var(--space-6);
    width: calc(100% - var(--sidebar-width));
    min-height: calc(100vh - var(--topbar-height));
}

/* --- Page Header --- */
.page-header {
    margin-bottom: var(--space-6);
}

.page-title {
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-text);
    margin: 0 0 var(--space-1);
    letter-spacing: -0.02em;
}

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

/* --- Stat Cards --- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.stat-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    transition: box-shadow var(--transition-base);
}

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

.stat-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-3);
}

.stat-card-label {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
}

.stat-card-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-base);
}

.stat-card-icon.primary {
    background: var(--color-primary-subtle);
    color: var(--color-primary);
}

.stat-card-icon.success {
    background: var(--color-success-subtle);
    color: var(--color-success);
}

.stat-card-icon.warning {
    background: var(--color-warning-subtle);
    color: var(--color-warning);
}

.stat-card-icon.danger {
    background: var(--color-danger-subtle);
    color: var(--color-danger);
}

.stat-card-value {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.03em;
    line-height: 1;
}

/* --- Toolbar / Action Bar --- */
.toolbar {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
    flex-wrap: wrap;
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.toolbar-spacer {
    flex: 1;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: 7px 14px;
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: 500;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
    line-height: 1.4;
}

.btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px var(--color-surface), 0 0 0 4px var(--color-primary-light);
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background: var(--color-primary-light);
    border-color: var(--color-primary-light);
}

.btn-accent {
    background: var(--color-accent);
    color: var(--color-text-inverse);
    border-color: var(--color-accent);
}

.btn-accent:hover {
    background: var(--color-accent-light);
    border-color: var(--color-accent-light);
}

.btn-outline {
    background: var(--color-surface);
    color: var(--color-text);
    border-color: var(--color-border-strong);
}

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

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

.btn-ghost:hover {
    background: var(--color-background);
    color: var(--color-text);
}

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

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

.btn-sm {
    padding: 4px 10px;
    font-size: var(--text-xs);
}

.btn-icon {
    padding: 6px;
    width: 32px;
    height: 32px;
    justify-content: center;
}

/* --- Data Table --- */
.data-table-container {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--text-sm);
}

.data-table thead th {
    background: var(--color-background);
    color: var(--color-text-secondary);
    font-weight: 600;
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border);
    text-align: left;
    white-space: nowrap;
}

.data-table tbody td {
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text);
    vertical-align: middle;
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

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

.data-table tbody tr:hover {
    background: var(--color-background);
}

.data-table .cell-id {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    color: var(--color-text-secondary);
}

.data-table .cell-code {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    font-weight: 500;
}

.data-table .cell-actions {
    text-align: right;
}

/* --- Filter Section --- */
.filter-section {
    background: var(--color-surface);
    padding: 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-bottom: 1rem;
}

/* --- Badges --- */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: 999px;
    font-size: var(--text-xs);
    font-weight: 500;
    line-height: 1.6;
}

.badge-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
}

/* Status badges */
.badge-pending {
    background: var(--color-warning-subtle);
    color: var(--color-warning);
}

.badge-pending .badge-dot {
    background: var(--color-warning);
}

.badge-progress {
    background: var(--color-info-subtle);
    color: var(--color-info);
}

.badge-progress .badge-dot {
    background: var(--color-info);
}

.badge-resolved {
    background: var(--color-success-subtle);
    color: var(--color-success);
}

.badge-resolved .badge-dot {
    background: var(--color-success);
}

.badge-closed {
    background: var(--color-background);
    color: var(--color-text-secondary);
}

.badge-closed .badge-dot {
    background: var(--color-text-tertiary);
}

/* Priority badges */
.badge-high {
    background: var(--color-danger-subtle);
    color: var(--color-danger);
}

.badge-medium {
    background: var(--color-warning-subtle);
    color: var(--color-warning);
}

.badge-low {
    background: var(--color-success-subtle);
    color: var(--color-success);
}

/* --- Cards --- */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.card-header {
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-header-title {
    font-size: var(--text-md);
    font-weight: 600;
    color: var(--color-text);
    margin: 0;
}

.card-body {
    padding: var(--space-5);
}

/* --- Timeline --- */
.timeline {
    list-style: none;
    padding: 0;
    margin: 0;
}

.timeline-item {
    display: flex;
    gap: var(--space-3);
    padding-bottom: var(--space-4);
    position: relative;
}

.timeline-item:not(:last-child)::after {
    content: '';
    position: absolute;
    left: 11px;
    top: 28px;
    bottom: 0;
    width: 1px;
    background: var(--color-border);
}

.timeline-dot {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--color-primary-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
}

.timeline-dot i {
    font-size: 11px;
    color: var(--color-primary);
}

.timeline-content {
    flex: 1;
    padding-top: 2px;
}

.timeline-action {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text);
}

.timeline-meta {
    font-size: var(--text-xs);
    color: var(--color-text-secondary);
    margin-top: 2px;
}

.timeline-comment {
    margin-top: var(--space-2);
    padding: var(--space-3);
    background: var(--color-background);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

/* --- Detail Panel --- */
.detail-panel {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.detail-panel-header {
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.detail-panel-title {
    font-size: var(--text-md);
    font-weight: 600;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.detail-panel-id {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    color: var(--color-text-secondary);
    background: var(--color-background);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
}

/* --- Tabs --- */
.tabs {
    display: flex;
    border-bottom: 1px solid var(--color-border);
    gap: 0;
}

.tab {
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    border: none;
    background: none;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
    margin-bottom: -1px;
}

.tab:hover {
    color: var(--color-text);
}

.tab.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

.tab-content {
    padding: var(--space-4) 0;
}

/* --- JSON Display --- */
.json-display {
    background: #1e293b;
    color: #e2e8f0;
    padding: var(--space-4);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    overflow: auto;
    max-height: 160px;
}

/* --- Pagination --- */
.pagination {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    border-top: 1px solid var(--color-border);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

.pagination-controls {
    display: flex;
    gap: var(--space-1);
}

.pagination-btn {
    width: 32px;
    height: 32px;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
}

.pagination-btn:hover {
    border-color: var(--color-primary-light);
    color: var(--color-primary);
}

.pagination-btn.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

/* --- Section Divider --- */
.section-divider {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin: var(--space-6) 0 var(--space-4);
}

.section-divider-title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text);
    white-space: nowrap;
}

.section-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-border);
}

/* --- Responsive --- */
@media (max-width: 1200px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

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

    .topbar, .main-content {
        margin-left: 0;
        width: 100%;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }
}