:root{
  --bg:#0f172a; --bg-2:#1e293b; --panel:#ffffff; --ink:#0f172a; --muted:#64748b;
  --line:#e2e8f0; --brand:#4f46e5; --brand-2:#6366f1; --brand-soft:#eef2ff;
  --ok:#16a34a; --ok-soft:#dcfce7; --warn:#d97706; --warn-soft:#fef3c7;
  --bad:#dc2626; --bad-soft:#fee2e2; --radius:12px;
  --c0:#f1f5f9; --c1:#fee2e2; --c2:#fef3c7; --c3:#dcfce7;
}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  background:#f8fafc;color:var(--ink);font-size:14px;line-height:1.5}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}

/* ---------- Layout ---------- */
.layout{display:flex;min-height:100vh}
.sidebar{width:240px;background:var(--bg);color:#cbd5e1;flex-shrink:0;padding:18px 12px;
  position:sticky;top:0;height:100vh;overflow-y:auto}
.brand{display:flex;gap:10px;align-items:center;padding:6px 8px 18px;border-bottom:1px solid #1e293b;margin-bottom:12px}
.brand .logo{font-size:26px;color:var(--brand-2)}
.brand strong{color:#fff;display:block}
.brand small{color:#64748b;font-size:11px}
.nav-group{font-size:10px;text-transform:uppercase;letter-spacing:.08em;color:#475569;margin:14px 10px 6px}
.nav-item{display:block;padding:9px 12px;border-radius:8px;color:#cbd5e1;margin-bottom:2px;font-weight:500}
.nav-item:hover{background:#1e293b;text-decoration:none;color:#fff}
.nav-item.active{background:var(--brand);color:#fff}

.main{flex:1;display:flex;flex-direction:column;min-width:0}
.topbar{display:flex;justify-content:space-between;align-items:center;background:#fff;
  padding:14px 26px;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.topbar h1{font-size:18px;margin:0}
.user-box{display:flex;gap:12px;align-items:center;color:var(--muted)}
.content{padding:26px;max-width:1200px;width:100%}

/* ---------- Cards / panels ---------- */
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px;margin-bottom:20px}
.card h2{margin:0 0 14px;font-size:16px}
.card h3{margin:18px 0 10px;font-size:14px;color:var(--muted);text-transform:uppercase;letter-spacing:.05em}
.grid{display:grid;gap:18px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
@media(max-width:900px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.sidebar{width:200px}}

.stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.stat .num{font-size:28px;font-weight:700}
.stat .lbl{color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.05em}

/* ---------- Tables ---------- */
table{width:100%;border-collapse:collapse;font-size:13px}
th,td{padding:9px 10px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
th{background:#f8fafc;font-weight:600;color:#475569}
tr:hover td{background:#fbfcfe}
td.num,th.num{text-align:center}

/* ---------- Forms ---------- */
label{display:block;font-weight:600;font-size:12px;margin:12px 0 5px;color:#334155}
input,select,textarea{width:100%;padding:9px 11px;border:1px solid var(--line);border-radius:8px;
  font:inherit;background:#fff}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}
textarea{min-height:70px;resize:vertical}
.row{display:flex;gap:12px;flex-wrap:wrap}
.row>*{flex:1;min-width:120px}

.btn{display:inline-block;padding:9px 16px;border-radius:8px;border:1px solid transparent;
  background:var(--brand);color:#fff;font:inherit;font-weight:600;cursor:pointer;text-decoration:none}
.btn:hover{background:var(--brand-2);text-decoration:none}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{background:#f1f5f9}
.btn-danger{background:var(--bad)}
.btn-danger:hover{background:#b91c1c}
.btn-sm{padding:5px 10px;font-size:12px}

.badge{background:var(--brand-soft);color:var(--brand);padding:2px 9px;border-radius:999px;
  font-size:11px;font-weight:700;text-transform:uppercase}

.flash{padding:12px 16px;border-radius:8px;margin-bottom:18px;font-weight:500}
.flash.success{background:var(--ok-soft);color:#166534}
.flash.error{background:var(--bad-soft);color:#991b1b}
.flash.info{background:var(--brand-soft);color:var(--brand)}

.muted{color:var(--muted)}
.actions{display:flex;gap:6px}
.toolbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;gap:12px;flex-wrap:wrap}

/* ---------- Correlation matrix cells ---------- */
.corr{display:inline-block;min-width:26px;text-align:center;padding:3px 6px;border-radius:6px;font-weight:700}
.corr-0{background:var(--c0);color:#94a3b8}
.corr-1{background:var(--c1);color:#b91c1c}
.corr-2{background:var(--c2);color:#b45309}
.corr-3{background:var(--c3);color:#15803d}
.matrix select{padding:4px;text-align:center;min-width:56px}
.matrix td,.matrix th{text-align:center}
.matrix th:first-child,.matrix td:first-child{text-align:left;min-width:220px}
.avg-row td{background:#eef2ff;font-weight:700}

.att-bar{height:10px;border-radius:999px;background:#e2e8f0;overflow:hidden}
.att-bar>span{display:block;height:100%;background:var(--brand)}

/* ---------- Login ---------- */
.login-wrap{display:flex;min-height:100vh;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#1e293b,#4f46e5)}
.login-card{background:#fff;padding:34px;border-radius:16px;width:360px;box-shadow:0 20px 60px rgba(0,0,0,.3)}
.login-card h1{margin:0 0 4px;font-size:22px}
.login-card p{color:var(--muted);margin:0 0 20px}
.login-card .btn{width:100%;margin-top:18px}
.hint{margin-top:16px;font-size:12px;color:var(--muted);text-align:center}