:root {
    /* Tailscale-inspired colors */
    --ts-black: #0f172a;
    --ts-gray-900: #1e293b;
    --ts-gray-800: #334155;
    --ts-gray-700: #475569;
    --ts-gray-600: #64748b;
    --ts-gray-500: #94a3b8;
    --ts-gray-400: #cbd5e1;
    --ts-gray-300: #e2e8f0;
    --ts-gray-200: #f1f5f9;
    --ts-gray-100: #f8fafc;
    --ts-white: #ffffff;

    --ts-blue-600: #2563eb;
    --ts-blue-500: #3b82f6;
    --ts-blue-100: #dbeafe;

    --ts-green-600: #16a34a;
    --ts-green-500: #22c55e;
    --ts-green-100: #dcfce7;

    --ts-yellow-600: #ca8a04;
    --ts-yellow-500: #eab308;
    --ts-yellow-100: #fef9c3;

    --ts-red-600: #dc2626;
    --ts-red-500: #ef4444;
    --ts-red-100: #fee2e2;

    /* Semantic colors */
    --color-bg: var(--ts-gray-100);
    --color-sidebar: var(--ts-white);
    --color-card: var(--ts-white);
    --color-text: var(--ts-gray-900);
    --color-text-secondary: var(--ts-gray-600);
    --color-border: var(--ts-gray-200);
    --color-primary: var(--ts-blue-600);
    --color-primary-hover: var(--ts-blue-500);

    /* Spacing */
    --sidebar-width: 240px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--color-text);
    background: var(--color-bg);
}

a {
    color: var(--color-primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* ==========================================================================
   Layout: Sidebar + Main Content
   ========================================================================== */

.app-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--color-sidebar);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
}

.sidebar-header {
    padding: 20px 16px;
    border-bottom: 1px solid var(--color-border);
}

.sidebar-brand {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
}

.sidebar-brand:hover {
    text-decoration: none;
}

.sidebar-nav {
    flex: 1;
    padding: 12px 0;
}

.sidebar-nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    color: var(--ts-gray-700);
    text-decoration: none;
    font-weight: 500;
    transition: background 0.15s, color 0.15s;
}

.sidebar-nav-item:hover {
    background: var(--ts-gray-100);
    color: var(--color-text);
    text-decoration: none;
}

.sidebar-nav-item.active {
    background: var(--ts-blue-100);
    color: var(--ts-blue-600);
}

.sidebar-nav-item svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-user {
    font-weight: 500;
    color: var(--ts-gray-700);
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 32px 40px;
    max-width: 1200px;
}

/* ==========================================================================
   Auth Pages (standalone, no sidebar)
   ========================================================================== */

.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--ts-gray-100);
}

.auth-container {
    background: var(--color-card);
    padding: 32px;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    width: 100%;
    max-width: 400px;
}

.auth-container h1 {
    text-align: center;
    font-size: 24px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 8px;
}

.auth-container h2 {
    text-align: center;
    font-weight: 400;
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: 24px;
}

.auth-link {
    text-align: center;
    margin-top: 16px;
    color: var(--color-text-secondary);
    font-size: 14px;
}

/* ==========================================================================
   Page Layout
   ========================================================================== */

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 24px;
}

.page-header h1 {
    font-size: 24px;
    font-weight: 600;
    color: var(--color-text);
}

.page-meta {
    color: var(--color-text-secondary);
    font-size: 14px;
    margin-top: 4px;
}

.back-link {
    display: inline-block;
    color: var(--color-text-secondary);
    font-size: 13px;
    margin-bottom: 8px;
}

.back-link:hover {
    color: var(--color-primary);
}

/* ==========================================================================
   Forms
   ========================================================================== */

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    font-size: 14px;
    color: var(--ts-gray-700);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 14px;
    background: var(--ts-white);
    color: var(--color-text);
    transition: border-color 0.15s, box-shadow 0.15s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--ts-blue-100);
}

.form-group small {
    display: block;
    margin-top: 6px;
    color: var(--color-text-secondary);
    font-size: 13px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
    margin-top: 24px;
}

.form-card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 24px;
    max-width: 500px;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    background: var(--ts-white);
    color: var(--ts-gray-700);
    text-decoration: none;
    transition: all 0.15s;
}

.btn:hover {
    background: var(--ts-gray-100);
    text-decoration: none;
}

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

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

.btn-success {
    background: var(--ts-green-600);
    border-color: var(--ts-green-600);
    color: var(--ts-white);
}

.btn-success:hover {
    background: var(--ts-green-500);
    border-color: var(--ts-green-500);
}

.btn-danger {
    background: var(--ts-white);
    border-color: var(--ts-red-500);
    color: var(--ts-red-600);
}

.btn-danger:hover {
    background: var(--ts-red-100);
}

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

.btn-ghost:hover {
    background: var(--ts-gray-100);
    color: var(--color-text);
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: 4px 10px;
    font-size: 13px;
}

/* ==========================================================================
   Status Indicators
   ========================================================================== */

.status {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--ts-gray-700);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--ts-gray-400);
}

.status-online .status-dot {
    background: var(--ts-green-500);
}

.status-offline .status-dot {
    background: var(--ts-gray-400);
}

.status-pending .status-dot {
    background: var(--ts-yellow-500);
}

/* Legacy badges (still used in some places) */
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 9999px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success {
    background: var(--ts-green-100);
    color: var(--ts-green-600);
}

.badge-warning {
    background: var(--ts-yellow-100);
    color: var(--ts-yellow-600);
}

.badge-danger {
    background: var(--ts-red-100);
    color: var(--ts-red-600);
}

.badge-secondary {
    background: var(--ts-gray-200);
    color: var(--ts-gray-700);
}

/* ==========================================================================
   Cards
   ========================================================================== */

.card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 16px 20px;
    text-decoration: none;
    color: inherit;
    transition: box-shadow 0.15s, border-color 0.15s;
}

.card:hover {
    text-decoration: none;
}

a.card:hover,
.card-hover:hover {
    border-color: var(--ts-gray-300);
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
}

.card-title {
    font-weight: 600;
    font-size: 16px;
    color: var(--color-text);
    margin-bottom: 4px;
}

.card-meta {
    color: var(--color-text-secondary);
    font-size: 13px;
}

.card-footer {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--ts-gray-100);
    font-size: 12px;
    color: var(--color-text-secondary);
}

.card-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

/* ==========================================================================
   Stats Grid
   ========================================================================== */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 20px;
    text-align: center;
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1;
}

.stat-label {
    color: var(--color-text-secondary);
    font-size: 13px;
    margin-top: 4px;
}

.stat-success .stat-value {
    color: var(--ts-green-600);
}

.stat-warning .stat-value {
    color: var(--ts-yellow-600);
}

/* ==========================================================================
   Tables
   ========================================================================== */

.table {
    width: 100%;
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    border-collapse: separate;
    border-spacing: 0;
    overflow: hidden;
}

.table th,
.table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.table th {
    background: var(--ts-gray-100);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--ts-gray-600);
}

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

.table tbody tr:hover {
    background: var(--ts-gray-50);
}

.table code {
    background: var(--ts-gray-100);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
    font-family: 'SF Mono', Monaco, 'Courier New', monospace;
}

.table a {
    color: var(--color-text);
    font-weight: 500;
}

.table a:hover {
    color: var(--color-primary);
}

/* ==========================================================================
   Tabs
   ========================================================================== */

.tabs {
    display: flex;
    gap: 4px;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 24px;
}

.tab {
    padding: 12px 16px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    text-decoration: none;
    transition: color 0.15s, border-color 0.15s;
}

.tab:hover {
    color: var(--color-text);
    text-decoration: none;
}

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

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ==========================================================================
   Sections
   ========================================================================== */

.section {
    margin-bottom: 32px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: 16px;
    font-weight: 600;
}

/* ==========================================================================
   Dropdown Menu
   ========================================================================== */

.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-trigger {
    padding: 4px 8px;
    background: transparent;
    border: none;
    cursor: pointer;
    border-radius: 4px;
    color: var(--color-text-secondary);
}

.dropdown-trigger:hover {
    background: var(--ts-gray-100);
    color: var(--color-text);
}

.dropdown-menu {
    position: absolute;
    right: 0;
    top: 100%;
    min-width: 160px;
    background: var(--color-card);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    z-index: 50;
    display: none;
    padding: 4px 0;
}

.dropdown.open .dropdown-menu {
    display: block;
}

.dropdown-item {
    display: block;
    width: 100%;
    padding: 8px 12px;
    text-align: left;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 14px;
    color: var(--color-text);
    text-decoration: none;
}

.dropdown-item:hover {
    background: var(--ts-gray-100);
    text-decoration: none;
}

.dropdown-item-danger {
    color: var(--ts-red-600);
}

.dropdown-item-danger:hover {
    background: var(--ts-red-100);
}

/* ==========================================================================
   Alerts
   ========================================================================== */

.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 14px;
}

.alert-error {
    background: var(--ts-red-100);
    border: 1px solid var(--ts-red-500);
    color: var(--ts-red-600);
}

.alert-success {
    background: var(--ts-green-100);
    border: 1px solid var(--ts-green-500);
    color: var(--ts-green-600);
}

/* ==========================================================================
   Empty State
   ========================================================================== */

.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--color-text-secondary);
}

.empty-state p {
    margin-bottom: 8px;
}

.empty-state .btn {
    margin-top: 16px;
}

/* ==========================================================================
   Modal
   ========================================================================== */

.modal {
    border: none;
    border-radius: 12px;
    padding: 24px;
    max-width: 480px;
    width: 100%;
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
}

.modal::backdrop {
    background: rgba(0,0,0,0.5);
}

.modal h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
}

/* ==========================================================================
   Utilities
   ========================================================================== */

.text-muted {
    color: var(--color-text-secondary);
}

.text-mono {
    font-family: 'SF Mono', Monaco, 'Courier New', monospace;
    font-size: 13px;
}

/* Device row with machine info */
.device-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.device-icon {
    width: 32px;
    height: 32px;
    background: var(--ts-gray-200);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--ts-gray-600);
}

.device-info {
    flex: 1;
}

.device-name {
    font-weight: 500;
    color: var(--color-text);
}

.device-meta {
    font-size: 12px;
    color: var(--color-text-secondary);
}