:root {
    --color-primary: #18181B;
    --color-secondary: #3F3F46;
    --color-accent: #18181B;
    --color-background: #FAFAFA;
    --color-surface: #FFFFFF;
    --color-text: #18181B;
    --color-text-secondary: #71717A;
    --color-border: #E4E4E7;
    --color-success: #10B981;
    --color-warning: #F59E0B;
    
    --font-family: 'DM Sans', sans-serif;
    
    --radius: 4px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    --sidebar-width: 260px;
    --header-height: 64px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-background);
    color: var(--color-text);
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--color-surface);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    padding: var(--spacing-lg);
    z-index: 10;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 48px;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    letter-spacing: -0.5px;
}

.logo svg {
    width: 24px;
    height: 24px;
}

.nav-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.nav-item a {
    text-decoration: none;
    color: var(--color-text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: all 0.2s ease;
    font-size: 0.95rem;
    font-weight: 500;
}

.nav-item a:hover {
    background-color: #F4F4F5;
    color: var(--color-text);
}

.nav-item a.active {
    background-color: var(--color-primary);
    color: var(--color-surface);
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0; /* Prevents flex overflow */
}

/* Header */
.top-header {
    height: var(--header-height);
    background-color: var(--color-background); /* Transparent/Match bg */
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-xl);
    border-bottom: 1px solid transparent; /* Or keep minimal */
}

.breadcrumb {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

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

.header-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.85rem;
    color: var(--color-text);
    font-weight: 500;
}

.dot {
    width: 8px;
    height: 8px;
    background-color: var(--color-primary);
    border-radius: 50%;
}

.user-profile {
    width: 32px;
    height: 32px;
    background-color: #E4E4E7;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 600;
}

/* Content Area */
.content-area {
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
}

/* KPI Grid */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
}

.kpi-title {
    color: var(--color-text-secondary);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-sm);
}

.kpi-value {
    font-size: 2rem;
    font-weight: 500;
    color: var(--color-text);
}

.kpi-sub {
    font-size: 0.85rem;
    margin-top: var(--spacing-xs);
    color: var(--color-success);
}

/* Chart Panel (Mock Sankey) */
.chart-container {
    height: 300px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    padding: var(--spacing-lg);
}

.chart-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.chart-title {
    font-weight: 500;
}

/* Simple visual flow simulation */
.flow-viz {
    display: flex;
    justify-content: space-between;
    height: 100%;
    align-items: center;
}

.flow-column {
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    height: 100%;
    width: 120px;
}

.flow-node {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: var(--spacing-sm);
    text-align: center;
    border-radius: var(--radius);
    font-size: 0.9rem;
    position: relative;
    z-index: 2;
}

.flow-lines {
    flex: 1;
    position: relative;
    height: 100%;
    margin: 0 var(--spacing-md);
}

.flow-line {
    position: absolute;
    height: 2px;
    background: #E4E4E7;
    width: 100%;
    transform-origin: left;
}

.flow-line.active {
    background: var(--color-secondary);
    height: 3px;
}

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

table {
    width: 100%;
    border-collapse: collapse;
}

th {
    text-align: left;
    padding: var(--spacing-md);
    font-weight: 500;
    color: var(--color-text-secondary);
    font-size: 0.85rem;
    border-bottom: 1px solid var(--color-border);
    background-color: #FAFAFA;
}

td {
    padding: var(--spacing-md);
    font-size: 0.9rem;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text);
}

tr:last-child td {
    border-bottom: none;
}

tbody tr:hover {
    background-color: #F4F4F5;
    cursor: pointer;
}

/* Buttons */
.btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
    cursor: pointer;
    font-family: var(--font-family);
    font-size: 0.9rem;
    transition: all 0.2s;
}

.btn:hover {
    background: #F4F4F5;
}

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

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

/* Layout for Rules Page */
.rules-layout {
    display: flex;
    gap: var(--spacing-lg);
    height: calc(100vh - 120px);
}

.rules-list {
    flex: 2;
    overflow-y: auto;
}

.rules-inspector {
    flex: 1;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.inspector-header {
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-label {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

input[type="range"] {
    width: 100%;
    accent-color: var(--color-primary);
}

.checkbox-group {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.chip {
    padding: 4px 12px;
    background: #F4F4F5;
    border-radius: 16px;
    font-size: 0.8rem;
    border: 1px solid transparent;
    cursor: pointer;
}

.chip.selected {
    background: var(--color-primary);
    color: white;
}

/* Migrations List */
.migration-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.migration-info {
    flex: 1;
}

.migration-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
}

.service-name {
    font-weight: 500;
}

.migration-route {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.progress-track {
    height: 6px;
    background: #E4E4E7;
    border-radius: 3px;
    width: 100%;
    margin-top: var(--spacing-sm);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--color-secondary);
    border-radius: 3px;
    transition: width 1s linear;
}

.migration-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* Footer Status Bar */
.status-footer {
    position: fixed;
    bottom: 0;
    left: var(--sidebar-width);
    right: 0;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-sm) var(--spacing-xl);
    display: flex;
    gap: var(--spacing-lg);
    font-size: 0.8rem;
    color: var(--color-text-secondary);
}

.status-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.status-ok {
    color: var(--color-success);
}

/* Utilities */
.text-right { text-align: right; }
.text-mono { font-family: monospace; }
.text-green { color: var(--color-success); }
.flex-spacer { flex: 1; }

@media (max-width: 1024px) {
    .kpi-grid {
        grid-template-columns: 1fr;
    }
    .rules-layout {
        flex-direction: column;
    }
}