:root {
    --bg: #f4f6f9;
    --panel: #ffffff;
    --border: #e2e6ec;
    --text: #1f2933;
    --muted: #7b8794;
    --accent: #2563eb;
    --success: #16a34a;
    --success-bg: #e7f6ec;
    --warning: #d97706;
    --warning-bg: #fdf3e3;
    --critical: #dc2626;
    --critical-bg: #fdeaea;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
}

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

.app-nav {
    width: 240px;
    background: #111827;
    color: #e5e7eb;
    padding: 20px 16px;
    flex-shrink: 0;
}

.app-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    font-size: 15px;
    margin-bottom: 28px;
}
.app-brand-mark { color: var(--accent); font-size: 18px; }

.app-nav-links { list-style: none; padding: 0; margin: 0; }
.app-nav-links li { margin-bottom: 4px; }
.app-nav-links a {
    display: block;
    padding: 9px 12px;
    border-radius: 8px;
    color: #cbd5e1;
    text-decoration: none;
    font-weight: 500;
}
.app-nav-links a:hover { background: #1f2937; color: #fff; }
.app-nav-links a.active { background: var(--accent); color: #fff; }

.app-main { flex: 1; overflow-x: auto; }
.app-content { padding: 24px 32px; max-width: 1400px; }

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 20px;
}
h1 { font-size: 22px; margin: 0; }
h2 { font-size: 16px; margin: 0 0 12px; }

.page-actions { display: flex; gap: 12px; align-items: center; }
.range-select { color: var(--muted); font-size: 13px; }
.range-select select, .search, .add-server input {
    padding: 7px 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fff;
    font-size: 13px;
}

.btn {
    padding: 8px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fff;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
}
.btn:hover { background: #f3f4f6; }
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: #1d4ed8; }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn:disabled { opacity: .6; cursor: default; }

.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 14px;
    margin-bottom: 16px;
}
.stat-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 18px;
    border-left: 4px solid var(--muted);
}
.stat-value { font-size: 28px; font-weight: 700; }
.stat-label { color: var(--muted); font-size: 13px; margin-top: 4px; }
.stat-success { border-left-color: var(--success); }
.stat-warning { border-left-color: var(--warning); }
.stat-critical { border-left-color: var(--critical); }

.substat-row { display: flex; gap: 12px; margin-bottom: 20px; flex-wrap: wrap; }
.substat {
    padding: 8px 14px;
    border-radius: 8px;
    background: var(--panel);
    border: 1px solid var(--border);
    font-size: 13px;
}
.substat-success strong { color: var(--success); }
.substat-critical strong { color: var(--critical); }

.filter-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}
.filter-row .search { min-width: 240px; }

.vm-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
}
.vm-table th {
    text-align: left;
    padding: 11px 14px;
    background: #f8fafc;
    color: var(--muted);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: .03em;
    border-bottom: 1px solid var(--border);
}
.vm-table td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}
.vm-table tr:last-child td { border-bottom: none; }
.vm-name { font-weight: 600; }
.row-critical { background: var(--critical-bg); }
.row-warning { background: var(--warning-bg); }

.badge {
    display: inline-block;
    padding: 3px 9px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
}
.badge-success { background: var(--success-bg); color: var(--success); }
.badge-warning { background: var(--warning-bg); color: var(--warning); }
.badge-critical { background: var(--critical-bg); color: var(--critical); }
.badge-muted { background: #eef1f5; color: var(--muted); }

.copy-cell { display: flex; flex-direction: column; gap: 3px; }
.copy-meta { color: var(--muted); font-size: 12px; }
.copy-errors { color: var(--critical); font-size: 11px; font-family: monospace; }

.issue-list { margin: 0; padding-left: 16px; font-size: 12px; }
.issue-list li { margin-bottom: 2px; }
.muted { color: var(--muted); }
.empty { color: var(--muted); padding: 16px 0; }

.panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
}
.add-server { display: flex; gap: 10px; flex-wrap: wrap; }
.add-server input { min-width: 280px; }
.error-text { color: var(--critical); margin-top: 10px; }
.key-box {
    margin-top: 14px;
    padding: 14px;
    background: var(--success-bg);
    border: 1px solid var(--success);
    border-radius: 8px;
}
.key-value {
    display: block;
    margin-top: 6px;
    padding: 8px 10px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-family: monospace;
    word-break: break-all;
}
.actions { display: flex; gap: 6px; flex-wrap: wrap; }

@media (max-width: 720px) {
    .app-shell { flex-direction: column; }
    .app-nav { width: auto; }
    .app-content { padding: 16px; }
}