:root{
  --bg:#0f1720; --card:#182430; --card2:#1e2c3a; --line:#2a3a4a;
  --txt:#e6edf3; --mut:#8aa0b4; --acc:#3b82f6; --acch:#2f6fd6;
  --green:#22c55e; --grey:#64748b; --red:#ef4444; --redh:#dc2626;
}
*{box-sizing:border-box}
html,body{max-width:100%;overflow-x:hidden}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);color:var(--txt);line-height:1.5}
a{color:var(--acc);text-decoration:none}
a:hover{text-decoration:underline}
.logo{filter:grayscale(.1)}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.9em}

/* login */
.login-page{display:flex;min-height:100vh;align-items:center;justify-content:center;padding:1rem}
.login-card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:2rem;
  width:100%;max-width:360px;box-shadow:0 12px 40px rgba(0,0,0,.4)}
.brand{text-align:center;margin-bottom:1.25rem}
.brand .logo{font-size:2.2rem}
.brand h1{margin:.3rem 0 0;font-size:1.4rem}
.brand p{margin:.1rem 0 0;color:var(--mut);font-size:.9rem}
.login-card label{display:block;margin:.75rem 0;font-size:.85rem;color:var(--mut)}
.login-card input{width:100%;margin-top:.3rem;padding:.7rem .8rem;background:var(--bg);
  border:1px solid var(--line);border-radius:9px;color:var(--txt);font-size:1rem}
.login-card button{width:100%;margin-top:1rem;padding:.75rem;border:0;border-radius:9px;
  background:var(--acc);color:#fff;font-size:1rem;font-weight:600;cursor:pointer}
.login-card button:hover{background:var(--acch)}
.login-card .hint{color:var(--mut);font-size:.9rem;text-align:center;margin:.2rem 0 .6rem}
.login-card input.pin{text-align:center;letter-spacing:.4em;font-size:1.35rem;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.login-card .cancel{display:block;text-align:center;margin-top:.85rem;color:var(--mut);font-size:.85rem}

/* layout */
.topbar{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.5rem;
  background:var(--card);border-bottom:1px solid var(--line)}
.topbar .title{font-weight:700;font-size:1.1rem}
.topbar .user{color:var(--mut);font-size:.9rem}
main{width:100%;margin:1.5rem 0;padding:0 clamp(1rem,3vw,2.5rem)}

.stats{display:flex;gap:1rem;margin-bottom:1rem;flex-wrap:wrap}
.stat{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:1rem 1.4rem;flex:1;min-width:140px}
.stat .num{display:block;font-size:1.8rem;font-weight:700}
.stat .online-num{color:var(--green)}
.stat .lbl{color:var(--mut);font-size:.85rem}

.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:1.2rem;margin-bottom:1rem}
.card h2{margin:0 0 .9rem;font-size:1rem;color:var(--mut);font-weight:600;text-transform:uppercase;letter-spacing:.03em}

.addform{display:flex;gap:.6rem;flex-wrap:wrap}
.addform input{flex:1;min-width:200px;padding:.65rem .8rem;background:var(--bg);border:1px solid var(--line);
  border-radius:9px;color:var(--txt);font-size:1rem}
.addform button{padding:.65rem 1.2rem;border:0;border-radius:9px;background:var(--acc);color:#fff;
  font-weight:600;cursor:pointer}
.addform button:hover{background:var(--acch)}

.table-wrap{width:100%}
table{width:100%;border-collapse:collapse;table-layout:auto}
th,td{padding:.7rem .6rem;text-align:left;border-bottom:1px solid var(--line);vertical-align:middle;overflow-wrap:anywhere}
th{color:var(--mut);font-size:.78rem;text-transform:uppercase;letter-spacing:.03em;white-space:nowrap}
td.name{font-weight:600}
td.empty{text-align:center;color:var(--mut);padding:1.5rem}
.actions-col{text-align:right}
td.actions{text-align:right;display:flex;gap:.4rem;justify-content:flex-end;flex-wrap:wrap}

.dot{display:inline-block;width:12px;height:12px;border-radius:50%}
.dot.on{background:var(--green);box-shadow:0 0 0 3px rgba(34,197,94,.2)}
.dot.off{background:var(--grey)}

.btn{display:inline-block;padding:.45rem .7rem;border:0;border-radius:8px;background:var(--acc);color:#fff;
  cursor:pointer;font-size:.85rem;font-weight:600}
.btn:hover{background:var(--acch);text-decoration:none}
.btn.sm{padding:.35rem .6rem;font-size:.8rem}
.btn.ghost{background:var(--card2);border:1px solid var(--line);color:var(--txt)}
.btn.ghost:hover{background:#25384a}
.btn.danger{background:var(--red)}
.btn.danger:hover{background:var(--redh)}

.flash{padding:.7rem 1rem;border-radius:9px;margin-bottom:1rem;font-size:.9rem}
.flash.ok{background:rgba(34,197,94,.12);border:1px solid var(--green);color:#a7f3c4}
.flash.err{background:rgba(239,68,68,.12);border:1px solid var(--red);color:#fca5a5}

.foot{color:var(--mut);font-size:.8rem;text-align:center;margin-top:1rem}

/* modal QR */
.modal{position:fixed;inset:0;background:rgba(0,0,0,.6);display:none;align-items:center;justify-content:center;padding:1rem}
.modal.show{display:flex}
.modal-box{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:1.5rem;text-align:center;max-width:340px}
.modal-box h3{margin:0 0 1rem}
.modal-box img{width:260px;height:260px;background:#fff;border-radius:8px;padding:8px}
.modal-box p{color:var(--mut);font-size:.85rem;margin:.8rem 0}