:root {
    --bg-primary: #0f1117;
    --bg-secondary: #1a1d27;
    --bg-card: #1e2130;
    --bg-input: #252838;
    --bg-hover: #2a2d3d;
    --text-primary: #e4e6ef;
    --text-secondary: #8b8fa3;
    --text-muted: #5c5f73;
    --border: #2e3144;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --success: #22c55e;
    --danger: #ef4444;
    --warning: #f59e0b;
    --radius: 8px;
    --radius-sm: 4px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.text-muted { color: var(--text-muted); }
.text-sm { font-size: 12px; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.hidden { display: none !important; }
.flex { display: flex; }
.gap-1 { gap: 8px; }

/* ── Topbar ── */
.topbar {
    display: flex;
    align-items: center;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 12px 24px;
    gap: 24px;
}
.topbar .brand {
    display: flex;
    align-items: baseline;
    gap: 10px;
}
.topbar .brand strong {
    color: var(--accent);
    font-size: 20px;
    font-weight: 700;
}
.topbar .brand .tenant {
    color: var(--text-secondary);
    font-size: 12px;
}
.topnav {
    display: flex;
    gap: 4px;
    flex: 1;
}
.topnav a {
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 14px;
}
.topnav a.active, .topnav a:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    text-decoration: none;
}
.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
}

/* ── Login ── */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}
.login-box {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 40px;
    width: 100%;
    max-width: 400px;
}
.login-box h1 {
    text-align: center;
    font-size: 28px;
    color: var(--accent);
    margin-bottom: 4px;
}
.login-box .subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 24px;
}
.btn-microsoft {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 12px 16px;
    background: #2f2f2f;
    color: #fff;
    border-radius: var(--radius-sm);
    font-weight: 500;
}
.btn-microsoft:hover { background: #3a3a3a; text-decoration: none; color: #fff; }

/* ── Main ── */
.ndash-main { padding: 24px; max-width: 1600px; margin: 0 auto; }
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}
.page-header h1 { font-size: 22px; font-weight: 600; }

/* ── Instance grid ── */
.instances-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: 16px;
}
.instance-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
    cursor: pointer;
    transition: border-color 0.15s, transform 0.15s;
}
.instance-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}
.instance-card .hdr {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}
.instance-card .hdr h3 { font-size: 16px; font-weight: 600; }
.instance-card .hdr .status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}
.status-dot.ok { background: var(--success); box-shadow: 0 0 6px rgba(34,197,94,0.4); }
.status-dot.warn { background: var(--warning); box-shadow: 0 0 6px rgba(245,158,11,0.4); }
.status-dot.err { background: var(--danger); box-shadow: 0 0 6px rgba(239,68,68,0.4); }
.status-dot.stale { background: var(--text-muted); }

.instance-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-bottom: 14px;
}
.instance-stats .stat {
    text-align: center;
    padding: 10px 4px;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
}
.instance-stats .stat .num {
    font-size: 22px;
    font-weight: 700;
    line-height: 1;
}
.instance-stats .stat .lbl {
    font-size: 10px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 4px;
}
.num.up { color: var(--success); }
.num.down { color: var(--danger); }
.num.alert { color: var(--warning); }
.num.info { color: var(--accent); }

.instance-meta {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    color: var(--text-muted);
}
.instance-meta a { color: var(--accent); }

.instance-card.error-card {
    border-color: var(--danger);
}
.instance-card .error-msg {
    background: rgba(239,68,68,0.1);
    color: var(--danger);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    font-size: 12px;
}

.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}
.spinner {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: inline-block;
    vertical-align: middle;
    margin-right: 8px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Buttons & forms ── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 13px;
    cursor: pointer;
    transition: background 0.15s;
}
.btn:hover { background: var(--bg-hover); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn-sm { padding: 4px 10px; font-size: 12px; }

.role-badge {
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
}
.role-admin { background: rgba(59,130,246,0.15); color: var(--accent); }
.role-viewer { background: rgba(139,143,163,0.15); color: var(--text-secondary); }

.alert {
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    font-size: 13px;
}
.alert-danger { background: rgba(239,68,68,0.15); color: var(--danger); }

/* ── Tabs ── */
.tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--border);
}
.tabs button {
    padding: 8px 14px;
    background: transparent;
    color: var(--text-secondary);
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    font-size: 13px;
}
.tabs button.active {
    color: var(--text-primary);
    border-bottom-color: var(--accent);
}

/* ── Card / Table ── */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}
.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
}
.card-header h3 { font-size: 14px; font-weight: 600; }
table { width: 100%; border-collapse: collapse; }
th {
    padding: 10px 12px;
    text-align: left;
    background: var(--bg-input);
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border);
}
td {
    padding: 10px 12px;
    font-size: 13px;
    border-bottom: 1px solid var(--border);
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--bg-hover); }

/* ── Modal ── */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    align-items: center;
    justify-content: center;
    z-index: 1000;
}
.modal-overlay.active { display: flex; }
.modal {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    width: 90%;
    max-width: 500px;
}
.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}
.modal-header h3 { font-size: 16px; }
.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 24px;
    cursor: pointer;
}
.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}
.form-group {
    margin-bottom: 12px;
}
.form-group label {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}
.form-control {
    width: 100%;
    padding: 8px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 13px;
}
.form-control:focus {
    outline: none;
    border-color: var(--accent);
}
.form-check {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    cursor: pointer;
}

/* ── Summary bar ── */
.summary-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
    margin-bottom: 20px;
}
.summary-stat {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px;
    text-align: center;
}
.summary-stat .num {
    font-size: 26px;
    font-weight: 700;
}
.summary-stat .lbl {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 4px;
}

/* ── Group tree ── */
.group-tree {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.group-node {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}
.group-node.subgroup {
    border-radius: var(--radius-sm);
    margin: 3px 12px;
    background: var(--bg-input);
}
.group-node.error-node {
    border-color: var(--danger);
}
.group-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    cursor: pointer;
    user-select: none;
    transition: background 0.15s;
}
.group-header:hover {
    background: var(--bg-hover);
}
.group-chevron {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    transition: transform 0.2s;
    color: var(--text-muted);
}
.group-node.open > .group-header > .group-chevron {
    transform: rotate(90deg);
}
.group-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    color: var(--accent);
}
.instance-icon {
    color: var(--warning);
}
.group-name {
    font-weight: 600;
    font-size: 14px;
    flex: 1;
}
.instance-node > .group-header .group-name {
    font-size: 15px;
}
.group-node.has-down > .group-header .group-name {
    color: var(--danger);
}
.group-stats {
    display: flex;
    gap: 8px;
    align-items: center;
    font-size: 12px;
}
.group-stats .stat {
    display: flex;
    align-items: center;
    gap: 3px;
}
.group-stats .stat-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}
.group-stats .stat-dot.up { background: var(--success); }
.group-stats .stat-dot.down { background: var(--danger); }
.group-stats .stat-dot.unknown { background: var(--text-muted); }
.group-stats .stat-dot.paused { background: var(--accent); }
.group-stats .stat-count {
    font-weight: 500;
    font-variant-numeric: tabular-nums;
}
.group-health {
    width: 80px;
    height: 6px;
    border-radius: 3px;
    background: var(--bg-primary);
    overflow: hidden;
    display: flex;
    flex-shrink: 0;
}
.group-health .bar-up { background: var(--success); }
.group-health .bar-down { background: var(--danger); }
.group-health .bar-unknown { background: var(--text-muted); }
.group-health .bar-paused { background: var(--accent); }
.group-children {
    display: none;
    border-top: 1px solid var(--border);
}
.group-node.open > .group-children {
    display: block;
    padding: 6px 0;
}
.group-host-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 14px 6px 44px;
    font-size: 13px;
    border-bottom: 1px solid var(--border);
}
.group-host-row:last-child {
    border-bottom: none;
}
.group-host-row.empty {
    color: var(--text-muted);
    font-style: italic;
    padding-left: 44px;
}
.group-host-status {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}
.group-host-status.up { background: var(--success); box-shadow: 0 0 6px rgba(34,197,94,0.4); }
.group-host-status.down { background: var(--danger); box-shadow: 0 0 6px rgba(239,68,68,0.4); }
.group-host-status.unknown { background: var(--text-muted); }
.group-host-status.paused { background: var(--accent); box-shadow: 0 0 6px rgba(59,130,246,0.4); }
.group-host-row.clickable { cursor: pointer; }
.group-host-row.clickable:hover { background: var(--bg-hover); }
.ack-badge-inline {
    background: rgba(59,130,246,0.15);
    color: var(--accent);
    font-size: 10px;
    font-weight: 700;
    padding: 1px 6px;
    border-radius: 3px;
    text-transform: uppercase;
}
.group-host-name {
    flex: 1;
    font-weight: 500;
}
.group-host-ip {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 12px;
    color: var(--text-secondary);
    min-width: 120px;
}
.group-host-meta {
    font-size: 11px;
    color: var(--text-muted);
    min-width: 80px;
    text-align: right;
}
.meta-text {
    font-size: 11px;
    color: var(--text-muted);
}
.error-badge {
    background: rgba(239,68,68,0.15);
    color: var(--danger);
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
}