:root{
  --primary:#0B5FFF; --secondary:#0A1F44; --accent:#12B886;
  --bg:#F7F9FC; --surface:#FFFFFF; --text:#0A1F2B; --muted:#5B6B79;
  --border:#E3E8EF; --success:#12B886; --warning:#F5A623; --error:#E5484D;
  --radius:10px; --container:1200px;
  --font-heading:'Inter',sans-serif; --font-body:'Inter',sans-serif;
}
*{box-sizing:border-box}
body{margin:0;font-family:var(--font-body);background:var(--bg);color:var(--text);font-size:16px;line-height:1.5}
h1,h2,h3,h4{font-family:var(--font-heading);margin:0 0 8px;line-height:1.2}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:var(--container);margin:0 auto;padding:0 24px}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px}
.btn{display:inline-flex;align-items:center;gap:6px;background:var(--primary);color:#fff;border:0;padding:11px 18px;border-radius:var(--radius);font-weight:600;font-size:14px;cursor:pointer;text-decoration:none}
.btn:hover{opacity:0.92;text-decoration:none}
.btn.secondary{background:transparent;color:var(--primary);border:1px solid var(--border)}
.btn.danger{background:var(--error)}
.btn.ghost{background:transparent;color:var(--text);border:1px solid var(--border)}
.btn.sm{padding:7px 12px;font-size:13px}
.btn:disabled{opacity:0.5;cursor:not-allowed}
label{display:block;font-size:13px;font-weight:600;margin:14px 0 6px;color:var(--secondary)}
input,select,textarea{width:100%;padding:11px 13px;border:1px solid var(--border);border-radius:8px;font-size:14px;font-family:inherit;background:#fff;color:var(--text)}
input:focus,select:focus,textarea:focus{outline:2px solid var(--primary);outline-offset:1px}
.form-row{display:flex;gap:16px}
.form-row > *{flex:1}
.hint{font-size:12px;color:var(--muted);margin-top:4px}
.badge{display:inline-block;padding:3px 10px;border-radius:100px;font-size:12px;font-weight:600}
.badge.green{background:#e7f9f1;color:#0d6b4a}
.badge.red{background:#fdecec;color:#a3231f}
.badge.amber{background:#fef3e0;color:#8a5a06}
.badge.gray{background:#eef1f4;color:var(--muted)}
.badge.blue{background:#e8f0ff;color:var(--primary)}
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{text-align:left;padding:12px 10px;border-bottom:1px solid var(--border)}
th{color:var(--muted);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:0.03em}
tr:last-child td{border-bottom:0}
.flash{padding:12px 16px;border-radius:8px;margin-bottom:16px;font-size:14px}
.flash.success{background:#e7f9f1;color:#0d6b4a;border:1px solid #b7ecd6}
.flash.error{background:#fdecec;color:#a3231f;border:1px solid #f5c2c0}
.grid{display:grid;gap:16px}
.grid.cols-2{grid-template-columns:1fr 1fr}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
.grid.cols-4{grid-template-columns:repeat(4,1fr)}
.muted{color:var(--muted)}
.mono{font-family:ui-monospace,Menlo,monospace}
.stat{padding:20px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface)}
.stat .num{font-size:26px;font-weight:700;font-family:var(--font-heading)}
.stat .label{font-size:13px;color:var(--muted)}
.sandbox-badge{background:#fef3e0;color:#8a5a06;font-size:11px;padding:2px 8px;border-radius:100px;font-weight:700;letter-spacing:0.02em}
nav.topbar{background:var(--surface);border-bottom:1px solid var(--border)}
nav.topbar .container{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-family:var(--font-heading);font-weight:800;font-size:19px;color:var(--secondary)}
.app-shell{display:flex;min-height:100vh}
.sidebar{width:240px;background:var(--secondary);color:#fff;flex-shrink:0;padding:20px 0}
.sidebar .logo{color:#fff;padding:0 20px 20px}
.sidebar a{display:block;color:#c9d3e6;padding:11px 20px;font-size:14px;font-weight:500}
.sidebar a:hover{background:rgba(255,255,255,0.06);text-decoration:none;color:#fff}
.sidebar a.active{background:rgba(255,255,255,0.1);color:#fff;border-right:3px solid var(--accent)}
.sidebar .section-label{padding:16px 20px 6px;font-size:11px;text-transform:uppercase;color:#7c8aa8;letter-spacing:0.05em}
.main{flex:1;min-width:0}
.main-header{background:var(--surface);border-bottom:1px solid var(--border);padding:16px 32px;display:flex;justify-content:space-between;align-items:center}
.main-body{padding:32px}
.footer-public{background:var(--secondary);color:#c9d3e6;padding:48px 0;margin-top:64px;font-size:14px}
.footer-public a{color:#fff}
.hero{padding:80px 0;background:linear-gradient(180deg,#fff,var(--bg))}
.pill{display:inline-block;padding:4px 12px;border-radius:100px;background:#e8f0ff;color:var(--primary);font-size:12px;font-weight:700;margin-bottom:16px}