:root{
  --bg:#f3f6fb;
  --card:#ffffff;
  --text:#1e293b;
  --muted:#64748b;
  --primary:#0f172a;
  --accent:#1d4ed8;
  --border:#dbe2ea;
  --ok:#0f766e;
  --danger:#b91c1c;
}
*{box-sizing:border-box}
body{margin:0;font-family:Arial,Helvetica,sans-serif;background:var(--bg);color:var(--text)}
a{text-decoration:none;color:inherit}
.layout{display:flex;min-height:100vh}
.sidebar{width:240px;background:#0f172a;color:#fff;padding:20px}
.sidebar h1{font-size:22px;margin:0 0 18px}
.sidebar nav a{display:block;padding:12px 14px;border-radius:12px;margin-bottom:8px;color:#e2e8f0}
.sidebar nav a.active,.sidebar nav a:hover{background:#1e293b}
.main{flex:1;padding:24px}
.topbar{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:20px}
.card{background:var(--card);border:1px solid var(--border);border-radius:18px;padding:18px;box-shadow:0 2px 8px rgba(15,23,42,.04)}
.grid{display:grid;gap:16px}
.grid-4{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
h1,h2,h3{margin-top:0}
.small{font-size:13px;color:var(--muted)}
.value{font-size:28px;font-weight:700}
.table{width:100%;border-collapse:collapse}
.table th,.table td{padding:10px;border-bottom:1px solid var(--border);text-align:left;vertical-align:top}
form{display:grid;gap:12px}
input,select,textarea,button{font:inherit}
input,select,textarea{width:100%;padding:11px 12px;border:1px solid var(--border);border-radius:12px;background:#fff}
button{padding:11px 14px;border-radius:12px;border:none;background:var(--primary);color:#fff;cursor:pointer}
button.secondary{background:#e2e8f0;color:#0f172a}
button.good{background:var(--ok)}
button.warn{background:var(--danger)}
.actions{display:flex;gap:8px;flex-wrap:wrap}
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}
.login-card{max-width:420px;width:100%}
.notice{padding:10px 12px;border-radius:12px;background:#eff6ff;color:#1d4ed8}
.error{padding:10px 12px;border-radius:12px;background:#fef2f2;color:#b91c1c}
.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}
.tabs button{background:#cbd5e1;color:#0f172a}
.tabs button.active{background:#0f172a;color:#fff}
.badge{display:inline-block;padding:4px 8px;border-radius:999px;background:#e2e8f0;font-size:12px}
@media (max-width: 860px){
  .layout{display:block}
  .sidebar{width:auto}
}