:root{
  --ink:#1c2830; --ink-2:#2b3b46; --steel:#2d5a78; --steel-dk:#224762;
  --concrete:#e7eaec; --surface:#fff; --line:#d3d9dd; --muted:#617079;
  --safety:#f5b700; --safety-dk:#d99f00;
  --ok:#2b7a4b; --ok-bg:#e1f1e8; --assigned:#2d5a78; --assigned-bg:#e0ebf3;
  --warn:#9a5b00; --warn-bg:#fbeccd; --gone:#59636a; --gone-bg:#e6e9eb;
  --danger:#b3261e; --danger-bg:#fbe4e2;
  --radius:6px;
  font-family:"Segoe UI",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
  color:var(--ink);
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{background:var(--concrete);font-size:15px;line-height:1.45}
[hidden]{display:none!important}
h1,h2,h3{margin:0;line-height:1.2}
a{color:var(--steel)}
:focus-visible{outline:3px solid var(--safety);outline-offset:2px}

/* brand */
.brand{display:flex;align-items:center;gap:12px}
.brand strong{display:block;font-size:16px}
.brand small{display:block;color:inherit;opacity:.7;font-size:12.5px}
.brand-mark{display:grid;place-items:center;width:44px;height:44px;background:var(--safety);color:var(--ink);font-weight:800;font-size:15px;letter-spacing:.5px;border-radius:4px}

/* auth */
.auth{min-height:100%;display:grid;place-items:center;padding:24px;background:var(--ink)}
.auth-card{background:var(--surface);width:100%;max-width:400px;padding:32px;border-radius:var(--radius);border-top:6px solid var(--safety)}
.auth-card .brand{margin-bottom:24px;color:var(--ink)}
.auth-card h1{font-size:20px;margin-bottom:6px}
.auth-card p.hint{margin:0 0 16px;color:var(--muted)}

/* shell */
.shell{display:grid;grid-template-columns:240px 1fr;min-height:100vh}
.side{background:var(--ink);color:#fff;padding:22px 16px;display:flex;flex-direction:column;gap:28px;position:sticky;top:0;height:100vh}
.side nav{display:flex;flex-direction:column;gap:2px}
.side nav a{color:#cfd8de;text-decoration:none;padding:10px 12px;border-radius:var(--radius);border-left:4px solid transparent}
.side nav a:hover{background:var(--ink-2);color:#fff}
.side nav a.active{background:var(--ink-2);color:#fff;border-left-color:var(--safety);font-weight:600}
.side-foot{margin-top:auto;display:flex;flex-direction:column;align-items:flex-start;gap:6px}
.who{font-size:13px;color:#cfd8de;margin-bottom:6px}
.link{background:none;border:0;color:#cfd8de;padding:4px 0;cursor:pointer;font:inherit;font-size:13.5px;text-decoration:underline}
.link:hover{color:#fff}
.main{padding:28px 32px 56px;max-width:1280px;width:100%}
.main:focus{outline:none}

/* page header */
.page-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:20px}
.page-head h1{font-size:26px}
.page-head p{margin:4px 0 0;color:var(--muted)}
.actions{display:flex;gap:8px;flex-wrap:wrap}

/* buttons */
.btn{font:inherit;font-weight:600;border:1px solid var(--line);background:var(--surface);color:var(--ink);padding:8px 14px;border-radius:var(--radius);cursor:pointer;min-height:38px}
.btn:hover{border-color:#aab4ba;background:#f6f8f9}
.btn.primary{background:var(--safety);border-color:var(--safety-dk);color:var(--ink)}
.btn.primary:hover{background:var(--safety-dk)}
.btn.steel{background:var(--steel);border-color:var(--steel-dk);color:#fff}
.btn.steel:hover{background:var(--steel-dk)}
.btn.danger{color:var(--danger);border-color:#e3b4b0}
.btn.danger:hover{background:var(--danger-bg)}
.btn.sm{padding:4px 10px;min-height:30px;font-size:13.5px}
.btn:disabled{opacity:.6;cursor:wait}

/* panels & stats */
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}
.panel > h2{font-size:16px;padding:14px 16px;border-bottom:1px solid var(--line)}
.panel .empty{padding:24px 16px;color:var(--muted)}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px;margin-bottom:20px}
.stat{background:var(--surface);border:1px solid var(--line);border-left:6px solid var(--steel);border-radius:var(--radius);padding:14px 16px}
.stat b{display:block;font-size:30px;line-height:1.1}
.stat span{color:var(--muted);font-size:14px}
.stat.s-Available{border-left-color:var(--ok)}
.stat.s-Repair{border-left-color:var(--safety)}
.stat.s-Retired{border-left-color:var(--gone)}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:16px}

/* toolbar */
.toolbar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.toolbar input,.toolbar select{min-height:38px}
.toolbar input[type=search]{flex:1 1 240px}

/* forms */
label{display:block;font-weight:600;font-size:13.5px;margin-bottom:4px}
input,select,textarea{font:inherit;width:100%;padding:8px 10px;border:1px solid #b7c0c6;border-radius:var(--radius);background:#fff;color:var(--ink)}
input:focus,select:focus,textarea:focus{border-color:var(--steel)}
textarea{min-height:72px;resize:vertical}
.field{margin-bottom:14px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 14px}
.form-grid .full{grid-column:1/-1}
.err{background:var(--danger-bg);color:var(--danger);border:1px solid #e3b4b0;border-radius:var(--radius);padding:8px 12px;margin-bottom:14px;font-size:14px}
.help{font-size:13px;color:var(--muted);margin-top:3px}

/* tables */
.table-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:14.5px}
th,td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:13px;color:var(--muted);font-weight:600;background:#f4f6f7;white-space:nowrap}
tbody tr:hover{background:#fafbfb}
td.num,th.num{text-align:right}
td .sub{display:block;color:var(--muted);font-size:13px}
.row-actions{display:flex;gap:6px;flex-wrap:wrap}
.tag{font-weight:700;white-space:nowrap}

/* badges */
.badge{display:inline-block;padding:2px 9px;border-radius:99px;font-size:12.5px;font-weight:600;white-space:nowrap}
.b-Available,.b-Active,.b-Returned{background:var(--ok-bg);color:var(--ok)}
.b-Assigned,.b-Open{background:var(--assigned-bg);color:var(--assigned)}
.b-InRepair{background:var(--warn-bg);color:var(--warn)}
.b-Retired,.b-Inactive{background:var(--gone-bg);color:var(--gone)}

/* dialog */
dialog{border:0;border-radius:var(--radius);padding:0;width:min(720px,calc(100% - 24px));max-height:calc(100% - 24px);box-shadow:0 20px 60px rgba(0,0,0,.35)}
dialog::backdrop{background:rgba(20,30,36,.6)}
.dlg-head{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:16px 20px;border-bottom:1px solid var(--line);border-top:5px solid var(--safety)}
.dlg-head h2{font-size:19px}
.dlg-body{padding:20px;overflow:auto;max-height:calc(100vh - 190px)}
.dlg-foot{display:flex;justify-content:flex-end;gap:8px;padding:14px 20px;border-top:1px solid var(--line);background:#f6f8f9}
.x{border:0;background:none;font-size:26px;line-height:1;cursor:pointer;color:var(--muted);padding:2px 8px}
.kv{display:grid;grid-template-columns:150px 1fr;gap:6px 14px;margin:0 0 18px}
.kv dt{color:var(--muted)}
.kv dd{margin:0;word-break:break-word}
.sec-title{font-size:15px;margin:18px 0 8px}

/* toast */
.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:var(--ink);color:#fff;padding:10px 18px;border-radius:var(--radius);border-left:5px solid var(--safety);z-index:50;box-shadow:0 6px 24px rgba(0,0,0,.3)}

/* responsive */
@media (max-width:860px){
  .shell{grid-template-columns:1fr}
  .side{position:static;height:auto;flex-direction:row;flex-wrap:wrap;align-items:center;gap:12px 20px;padding:12px 14px}
  .side nav{flex-direction:row;flex-wrap:wrap;order:3;width:100%}
  .side nav a{border-left:0;border-bottom:3px solid transparent;border-radius:0;padding:8px 10px}
  .side nav a.active{border-bottom-color:var(--safety)}
  .side-foot{margin:0 0 0 auto;flex-direction:row;align-items:center;gap:14px}
  .who{display:none}
  .main{padding:20px 14px 48px}
  .grid-2{grid-template-columns:1fr}
  .form-grid{grid-template-columns:1fr}
  .kv{grid-template-columns:1fr;gap:0}
  .kv dt{margin-top:8px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
@media print{.side,.actions,.toolbar,.row-actions{display:none!important}.shell{display:block}}