:root {
    --bg:#f6f8fb;
    --card:#ffffff;
    --text:#172033;
    --muted:#667085;
    --border:#e5e7eb;
    --primary:#2563eb;
}
*{box-sizing:border-box}
body{margin:0;font-family:Arial,Helvetica,sans-serif;background:var(--bg);color:var(--text)}
.shell{display:flex;min-height:100vh}
.side{width:240px;background:#0f172a;color:white;padding:22px 16px;position:sticky;top:0;height:100vh}
.brand{font-size:21px;font-weight:800;margin-bottom:28px}
.side a{display:block;color:#dbeafe;text-decoration:none;padding:12px 10px;border-radius:10px;margin-bottom:6px}
.side a:hover{background:#1e293b}
.main{flex:1;padding:28px;max-width:1400px}
h1{margin:0 0 22px}
h2{margin-top:30px}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:20px;box-shadow:0 8px 24px rgba(15,23,42,.05)}
.card span{color:var(--muted);display:block;margin-bottom:8px}
.card b{font-size:30px}
table{width:100%;border-collapse:collapse;background:white;border-radius:14px;overflow:hidden;border:1px solid var(--border)}
th,td{padding:12px 14px;border-bottom:1px solid var(--border);text-align:left;vertical-align:top}
th{background:#f1f5f9}
.form-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:12px;background:white;border:1px solid var(--border);border-radius:14px;padding:16px;margin-bottom:20px}
input,select,button{padding:11px;border:1px solid var(--border);border-radius:10px;font-size:14px}
button{background:var(--primary);color:white;border:0;font-weight:700;cursor:pointer}
small{color:var(--muted)}