/* Light, compact, flat */
:root{
  --bg:#f5f6f8; --paper:#fff; --ink:#1f2937; --muted:#6b7280; --line:#d9dde3;
  --brand:#2563eb; --link:#0b63ce; --hover:#f2f4f7;
}

*{box-sizing:border-box} html,body{height:100%}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg)}

/* Top bar */
.topbar{height:52px;background:#0f172a;color:#e5e7eb;display:flex;align-items:center;justify-content:space-between;padding:0 14px;border-bottom:1px solid #0b1220}
.topbar a{color:#cbd5e1;text-decoration:none}
.topbar .sep{opacity:.6;margin:0 8px}
.brand-mini{display:flex;align-items:center;gap:8px;font-weight:600}
.brand-mini img{width:20px;height:20px}
.search input{height:30px; min-width:320px; border:1px solid #2a3345; background:#10172a; color:#e5e7eb; border-radius:4px; padding:0 10px}
.top-left{display:flex;align-items:center;gap:14px}

/* Shell: left nav | content | right rail */
.frame{display:grid;grid-template-columns: 208px 1fr 260px;gap:12px;padding:12px}
.nav,.actions,.content{background:var(--paper);border:1px solid var(--line);border-radius:4px}
.content{padding:14px;min-height:calc(100vh - 52px - 24px)}
.nav{display:flex;flex-direction:column;padding:10px}
.actions{padding:10px}

/* Left nav */
.nav nav{display:flex;flex-direction:column;gap:2px}
.nav a{padding:8px 10px;border-radius:4px;text-decoration:none;color:var(--ink)}
.nav a:hover{background:var(--hover)}
.nav a.active{background:#eaf1ff;color:#173e88}
.nav-foot{margin-top:auto;padding-top:8px;border-top:1px solid var(--line)}
.logout{color:#b91c1c;text-decoration:none}

/* Actions rail */
.actions-head{font-weight:600;margin-bottom:8px}
.action-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:6px}
.action-list a{display:block;padding:8px 10px;border:1px solid var(--line);border-radius:4px;text-decoration:none;color:var(--link)}
.action-list a:hover{background:#f7fbff}

/* Panels (flatter, denser) */
.panel{border:1px solid var(--line);border-radius:4px;background:#fff;margin-bottom:12px}
.panel .ph{padding:10px 12px;border-bottom:1px solid var(--line);font-weight:600}
.panel .pb{padding:10px 12px}

/* Cards grid (if needed) */
.cards{display:grid;grid-template-columns: repeat(12,1fr);gap:12px}
.card{grid-column: span 6;border:1px solid var(--line);border-radius:4px;background:#fff;padding:12px}
.card h2{margin:0 0 6px 0;font-size:16px}

/* Tables */
.table{width:100%;border-collapse:collapse;font-size:14px}
.table th,.table td{border-bottom:1px solid var(--line);padding:8px 6px;text-align:left;white-space:nowrap}
.table th{background:#f8fafc;font-weight:600}
.table tr:hover td{background:#fafbfd}
.table .muted{color:var(--muted)}

/* Forms */
label{display:block;margin:8px 0 4px 0;color:var(--muted);font-size:12px}
input,select,button{font:inherit}
input,select{width:100%;padding:8px;border:1px solid var(--line);border-radius:4px;background:#fff}
button{padding:8px 12px;border:1px solid #2b6fea;background:var(--brand);color:#fff;border-radius:4px;cursor:pointer}
button:hover{background:#1f54c3}

/* Login page tweaks remain compatible */
body.login{display:grid;place-items:center;min-height:100vh;padding:20px;background:var(--bg)}
.login-card{width:360px;max-width:92vw;background:#fff;border:1px solid var(--line);border-radius:4px;padding:18px}
.alert{background:#fde2e2;color:#7f1d1d;border:1px solid #f5c2c2;padding:8px;border-radius:4px;margin-bottom:10px}

/* Responsive */
@media (max-width:1100px){ .frame{grid-template-columns: 200px 1fr} .actions{display:none} }
@media (max-width:760px){ .frame{grid-template-columns: 1fr} .nav{position:sticky;top:12px} .search input{min-width:180px} }