:root {
  --bg: #f6f4f0; --card: #ffffff; --ink: #1a2233; --muted: #6b7690;
  --line: #e7e2d8; --brand: #b4541a; --brand-ink: #ffffff; /* amber: "operator / handle with care" */
  --ok: #1f9d55; --warn: #c7851a; --danger: #d1344b; --chip: #f2ede3;
  --shadow: 0 1px 3px rgba(20,30,60,.08), 0 6px 20px rgba(20,30,60,.06);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #15120c; --card: #211b12; --ink: #ece7dd; --muted: #a39a86;
    --line: #38301f; --brand: #e07a3c; --chip: #2a2114;
    --shadow: 0 1px 3px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.35);
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
.hidden { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.error { color: var(--danger); min-height: 1.2em; margin: 6px 0 0; font-size: 13px; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); padding: 20px; }
.brand { display: flex; align-items: center; gap: 8px; }
.brand h1 { font-size: 20px; margin: 0; }
.shield { font-size: 22px; }

/* Auth */
.auth { min-height: 100vh; display: grid; place-items: center; padding: 24px 16px; }
.auth-card { width: 100%; max-width: 380px; }
.auth-card .brand { justify-content: center; }
.auth-card > p.muted { text-align: center; margin: 2px 0 18px; }
form label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 12px; }
input {
  width: 100%; margin-top: 4px; padding: 10px 12px; border: 1px solid var(--line);
  border-radius: 10px; background: var(--bg); color: var(--ink); font-size: 15px;
}
input#code { letter-spacing: 4px; font: 600 18px ui-monospace, Menlo, Consolas, monospace; }
input:focus { outline: 2px solid var(--brand); border-color: var(--brand); }
button { font-size: 14px; }
.primary { background: var(--brand); color: var(--brand-ink); border: 0; padding: 11px 16px; border-radius: 10px; cursor: pointer; font-weight: 600; width: 100%; }
.ghost { background: transparent; border: 1px solid var(--line); color: var(--ink); padding: 7px 12px; border-radius: 9px; cursor: pointer; }
.ghost.small, .danger.small { padding: 6px 11px; font-size: 13px; }
.danger { background: transparent; border: 1px solid var(--danger); color: var(--danger); padding: 7px 12px; border-radius: 9px; cursor: pointer; font-weight: 600; }
.danger:hover { background: var(--danger); color: #fff; }
button:disabled { opacity: .5; cursor: default; }

/* App */
.topbar { display: flex; align-items: center; justify-content: space-between; padding: 12px 18px; border-bottom: 1px solid var(--line); background: var(--card); position: sticky; top: 0; z-index: 5; }
.topbar-right { display: flex; align-items: center; gap: 10px; }
.container { max-width: 880px; margin: 20px auto; padding: 0 16px; display: grid; gap: 18px; }
.section-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; gap: 10px; flex-wrap: wrap; }
.section-head h2 { margin: 0; font-size: 17px; }
.foot { max-width: 880px; margin: 8px auto 40px; padding: 0 16px; }

/* Clients */
.clients { display: grid; gap: 12px; }
.client { border: 1px solid var(--line); border-radius: 12px; padding: 14px; }
.client-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.client .name { font-weight: 600; word-break: break-all; }
.client-acts, .device-acts { display: flex; gap: 8px; flex-wrap: wrap; }
.devices-box { margin-top: 12px; display: grid; gap: 8px; border-top: 1px dashed var(--line); padding-top: 12px; }

/* Devices */
.device { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; }
.device .name { font-weight: 600; word-break: break-all; }
.dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin-right: 7px; vertical-align: middle; }
.dot.ok { background: var(--ok); } .dot.bad { background: var(--danger); } .dot.warn { background: var(--warn); }

.empty { color: var(--muted); padding: 10px 2px; }
.empty.small { padding: 4px 2px; font-size: 13px; }