:root {
  --bg: #f3f5f8;
  --panel: #ffffff;
  --panel-2: #f7f9fb;
  --line: #dde3ea;
  --text: #17202b;
  --muted: #5d6b7c;
  --accent: #1f6feb;
  --accent-soft: #e5efff;
  --ok: #1a7f37;
  --ok-soft: #dcf5e3;
  --warn: #9a6700;
  --warn-soft: #fff4d4;
  --bad: #c62828;
  --bad-soft: #fde7e7;
  --off: #8a96a5;
  --flash: #fff1b8;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06);
  --mono: ui-monospace, "Cascadia Mono", "SF Mono", Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1319; --panel: #151c24; --panel-2: #1a222c; --line: #2a3542; --text: #e3e9f0;
    --muted: #8e9cad; --accent: #4c94ff; --accent-soft: #16263d; --ok: #3fb950; --ok-soft: #12301c;
    --warn: #d4a72c; --warn-soft: #2e2611; --bad: #f47067; --bad-soft: #3a1717; --off: #5d6b7c;
    --flash: #3b3415; --shadow: none; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0e1319; --panel: #151c24; --panel-2: #1a222c; --line: #2a3542; --text: #e3e9f0;
  --muted: #8e9cad; --accent: #4c94ff; --accent-soft: #16263d; --ok: #3fb950; --ok-soft: #12301c;
  --warn: #d4a72c; --warn-soft: #2e2611; --bad: #f47067; --bad-soft: #3a1717; --off: #5d6b7c;
  --flash: #3b3415; --shadow: none; color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--text); font: 14px/1.45 var(--sans); }
button, input { font: inherit; color: inherit; }
a { color: var(--accent); }
.mono { font-family: var(--mono); font-size: 13px; }
.muted { color: var(--muted); }
.hidden { display: none !important; }

/* top bar */
.topbar {
  display: flex; flex-wrap: wrap; align-items: center; gap: 12px 20px;
  padding: 12px 20px; background: var(--panel); border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 5;
}
.brand { display: flex; align-items: baseline; gap: 10px; min-width: 0; }
.brand b { font-size: 16px; letter-spacing: .2px; }
.brand .sim-name { color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 40vw; }
.stats { display: flex; flex-wrap: wrap; gap: 8px; flex: 1; }
.stat {
  display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px; border-radius: 999px;
  background: var(--panel-2); border: 1px solid var(--line); white-space: nowrap; font-size: 13px;
}
.stat .k { color: var(--muted); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--off); }
.dot.live { background: var(--ok); box-shadow: 0 0 0 3px var(--ok-soft); }
.dot.stale { background: var(--bad); }
.actions { display: flex; gap: 8px; }

.btn {
  border: 1px solid var(--line); background: var(--panel); border-radius: 6px; padding: 5px 12px;
  cursor: pointer; white-space: nowrap;
}
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.danger:hover { border-color: var(--bad); color: var(--bad); }
.btn.small { padding: 2px 8px; font-size: 12px; }
.btn:disabled { opacity: .5; cursor: default; }

/* layout */
main {
  display: grid; grid-template-columns: minmax(0, 1fr) 420px; gap: 16px; padding: 16px 20px 40px;
  max-width: 1600px; margin: 0 auto;
}
.side { display: flex; flex-direction: column; gap: 16px; min-width: 0; }
@media (max-width: 1100px) { main { grid-template-columns: 1fr; } }
@media (max-width: 600px) { main { padding: 12px 16px 32px; } .topbar { padding: 10px 16px; } }

.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; box-shadow: var(--shadow); min-width: 0; }
.panel > header {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; padding: 12px 14px;
  border-bottom: 1px solid var(--line);
}
.panel > header h2 { margin: 0; font-size: 14px; font-weight: 600; }
.panel > header .count { color: var(--muted); font-weight: 400; }
.panel > header .grow { flex: 1; }
.panel .body { padding: 12px 14px; }
.panel .empty { padding: 18px 14px; color: var(--muted); text-align: center; }
.scroll-x { overflow-x: auto; }

/* tables */
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 6px 10px; border-bottom: 1px solid var(--line); vertical-align: middle; }
th { font-size: 12px; font-weight: 600; color: var(--muted); background: var(--panel-2); position: sticky; top: 0; }
tbody tr:last-child td { border-bottom: 0; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
a.btn { text-decoration: none; display: inline-block; }
.tags-wrap { max-height: calc(100vh - 190px); overflow: auto; }
@media (max-width: 1100px) { .tags-wrap { max-height: none; } }
.tag-name { font-family: var(--mono); font-size: 13px; font-weight: 600; }
.desc { color: var(--muted); font-size: 12px; max-width: 320px; }
tr.err td { background: var(--bad-soft); }
.err-text { color: var(--bad); font-size: 12px; font-family: var(--mono); }

/* value cells */
.val { font-family: var(--mono); font-size: 13px; font-variant-numeric: tabular-nums; white-space: nowrap; border-radius: 4px; padding: 1px 4px; transition: background-color .6s; }
.val.flash { background: var(--flash); transition: none; }
.val.settable { cursor: pointer; border-bottom: 1px dashed var(--muted); }
.val.settable:hover { color: var(--accent); border-color: var(--accent); }
.unit { color: var(--muted); font-size: 12px; margin-left: 3px; }
.pill { display: inline-block; min-width: 38px; text-align: center; padding: 1px 8px; border-radius: 999px; font-size: 12px; font-weight: 600; font-family: var(--mono); }
.pill.on { background: var(--ok-soft); color: var(--ok); }
.pill.off { background: var(--panel-2); color: var(--muted); border: 1px solid var(--line); }
button.pill { border: 0; cursor: pointer; }
button.pill.off { border: 1px solid var(--line); }
button.pill:hover { outline: 2px solid var(--accent); }
.edit-input { width: 110px; padding: 2px 6px; border: 1px solid var(--accent); border-radius: 4px; font-family: var(--mono); font-size: 13px; background: var(--panel); }
.raw { color: var(--muted); font-family: var(--mono); font-size: 12px; }
.badge { display: inline-block; padding: 0 7px; border-radius: 4px; font-size: 11px; font-weight: 600; background: var(--panel-2); color: var(--muted); border: 1px solid var(--line); }
.badge.expr { color: var(--accent); background: var(--accent-soft); border-color: transparent; }
.badge.active { background: var(--ok-soft); color: var(--ok); border-color: transparent; }

/* filters */
.chips { display: flex; flex-wrap: wrap; gap: 4px; }
.chip { border: 1px solid var(--line); background: var(--panel); border-radius: 999px; padding: 2px 10px; cursor: pointer; font-size: 12px; }
.chip[aria-pressed="true"] { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.search { padding: 4px 10px; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); width: 180px; max-width: 100%; }

/* clients */
.client-row td { font-size: 13px; }
details.history summary { cursor: pointer; padding: 8px 14px; color: var(--muted); font-size: 13px; border-top: 1px solid var(--line); }

/* workbooks */
.drop {
  display: block; border: 2px dashed var(--line); border-radius: 8px; padding: 16px; text-align: center;
  cursor: pointer; color: var(--muted); transition: border-color .15s, background .15s;
}
.drop:hover, .drop.over { border-color: var(--accent); background: var(--accent-soft); color: var(--text); }
.drop input { display: none; }
.upload-result { margin-top: 10px; font-size: 13px; }
.upload-result.ok { color: var(--ok); }
.upload-result ul { margin: 6px 0 0; padding-left: 18px; color: var(--bad); max-height: 220px; overflow: auto; }
.wb-list { list-style: none; margin: 0; padding: 0; }
.wb-list li { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px; padding: 9px 14px; border-top: 1px solid var(--line); }
.wb-list .meta { flex: 1; min-width: 160px; }
.wb-list .meta b { display: block; }
.wb-list .meta span { color: var(--muted); font-size: 12px; }

/* event log */
.log { max-height: 320px; overflow: auto; font-size: 13px; }
.log div { display: flex; gap: 10px; padding: 4px 14px; border-top: 1px solid var(--line); }
.log time { color: var(--muted); font-family: var(--mono); font-size: 12px; flex: none; }
.log .k-write { color: var(--accent); }
.log .k-connect { color: var(--ok); }
.log .k-disconnect, .log .k-kick, .log .k-reject { color: var(--warn); }
.log .k-login { color: var(--muted); }

.toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); background: var(--text); color: var(--bg);
  padding: 8px 16px; border-radius: 8px; font-size: 13px; z-index: 20; max-width: calc(100vw - 32px);
}

/* login */
.login-wrap { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login-card { width: 100%; max-width: 360px; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 28px; box-shadow: var(--shadow); }
.login-card h1 { margin: 0 0 4px; font-size: 20px; }
.login-card p { margin: 0 0 20px; color: var(--muted); }
.login-card label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.login-card input { width: 100%; padding: 8px 10px; border: 1px solid var(--line); border-radius: 6px; background: var(--panel-2); margin-bottom: 14px; }
.login-card input:focus { outline: 2px solid var(--accent); border-color: transparent; }
.login-card .btn { width: 100%; padding: 8px; }
.login-error { color: var(--bad); font-size: 13px; margin-top: 12px; min-height: 1em; }

/* roles */
body.member .admin-only { display: none !important; }
#role-badge:empty { display: none; }
#role-badge { align-self: center; }
#modbus-mode { margin-left: 4px; }
#modbus-mode.rw { background: var(--warn-soft); color: var(--warn); border-color: transparent; }
.login-card .wide { display: block; width: 100%; text-align: center; }
.login-card .sep { border: 0; border-top: 1px solid var(--line); margin: 20px 0 12px; }
.small { font-size: 12px; }
.logout-form { margin: 0; display: inline; }