:root{
    --navy:#0b2545; --blue:#1d4ed8; --teal:#0ea5a4; --bg:#f6f8fb;
    --card:#fff; --muted:#64748b; --line:#e5e9f2;
}
*{box-sizing:border-box}
body{margin:0;font-family:"Inter","Segoe UI",system-ui,-apple-system,sans-serif;background:var(--bg);color:#0f172a}
a{text-decoration:none}
.app-layout{display:flex;min-height:100vh}
.sidebar{width:250px;background:var(--navy);color:#c9d6ee;padding:18px 8px;position:sticky;top:0;height:100vh;overflow-y:auto}
.sidebar .brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;padding:8px 12px 18px;font-size:15px}
.sidebar .brand i{color:var(--teal)}
.sidebar .nav-link{color:#c9d6ee;padding:9px 12px;border-radius:8px;font-size:13.5px;display:flex;align-items:center;gap:10px}
.sidebar .nav-link:hover{background:rgba(255,255,255,.06);color:#fff}
.sidebar .nav-link.active{background:linear-gradient(90deg,var(--blue),var(--teal));color:#fff}
.sidebar .nav-section{color:#6b82a8;font-size:11px;text-transform:uppercase;letter-spacing:.1em;padding:14px 12px 4px}
.main-area{flex:1;display:flex;flex-direction:column;min-width:0}
.topbar{height:62px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 22px;position:sticky;top:0;z-index:5}
.topbar-right{display:flex;gap:8px;align-items:center}
.content{padding:22px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;box-shadow:0 1px 3px rgba(15,23,42,.04)}
.stat-card{padding:18px}
.stat-label{color:var(--muted);font-size:12.5px}
.stat-value{font-size:22px;font-weight:700;margin-top:6px}
.stat-sub{font-size:12px;color:var(--muted)}
.page-title{font-size:20px;font-weight:700;margin-bottom:4px}
.page-sub{color:var(--muted);font-size:13px;margin-bottom:18px}
.heatmap{display:grid;gap:2px}
.heatmap-cell{padding:6px;text-align:center;font-size:12px;border-radius:4px;color:#0f172a}
.badge-ok{background:#e6f7ee;color:#0f7b45;padding:2px 8px;border-radius:20px;font-size:12px}
.badge-warn{background:#fff4e5;color:#a35b00;padding:2px 8px;border-radius:20px;font-size:12px}
.badge-bad{background:#fde8e8;color:#a11717;padding:2px 8px;border-radius:20px;font-size:12px}
@media(max-width:900px){
    .sidebar{position:fixed;left:-250px;transition:.2s;z-index:20}
    .sidebar.open{left:0}
    .app-layout{display:block}
}