:root{--bg:#0f1419;--card:#1a2029;--fg:#e6e9ee;--mut:#8b96a5;--acc:#2ecc71;--acc2:#3498db;--err:#e74c3c;--warn:#f39c12;--line:#2a323d}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font-family:-apple-system,"Segoe UI",Roboto,"Noto Sans Thai",sans-serif;line-height:1.5}
a{color:var(--acc2);text-decoration:none}a:hover{text-decoration:underline}
/* ---- top bar + menus -------------------------------------------------------------------
   Four groups (rooms / device / admin / account), each a real <details> disclosure so the
   menu works with JavaScript off and reads correctly to a screen reader. On a phone the
   same markup becomes a drawer instead of a row of dropdowns — one nav, two shapes, so
   there is no second menu to keep in step with this one. */
.topbar{display:flex;align-items:center;gap:12px;background:#12171e;border-bottom:1px solid var(--line);
  position:sticky;top:0;z-index:50;
  padding:10px calc(16px + env(safe-area-inset-right)) 10px calc(16px + env(safe-area-inset-left));
  padding-top:calc(10px + env(safe-area-inset-top))}
.brand{font-weight:700;color:var(--fg);font-size:1.1rem;white-space:nowrap}
.topbar nav{margin-left:auto;display:flex;align-items:center;gap:6px}
.topbar .who{color:var(--mut);font-size:.9rem}
.hamb{display:none;margin-left:auto;background:#161c24;border:1px solid var(--line);color:var(--fg);
  font-size:1.15rem;line-height:1;padding:9px 13px;border-radius:9px}
nav .menu{position:relative}
nav .menu>summary{list-style:none;cursor:pointer;padding:8px 11px;border-radius:9px;
  display:flex;align-items:center;gap:7px;color:var(--fg);font-size:.95rem;white-space:nowrap;user-select:none}
nav .menu>summary::-webkit-details-marker{display:none}
nav .menu>summary::after{content:"▾";color:var(--mut);font-size:.8rem}
nav .menu>summary:hover{background:#1a212a}
nav .menu[open]>summary{background:#1c232c}
/* which section you are standing in — said once, on the group, not on every link */
nav .menu.on>summary{background:#12283a;color:#cfe4ff}
/* A top-level entry that is a destination rather than a group (📱 อุปกรณ์). Same box as a
   .menu summary so the bar stays one row of equals — the only difference is no ▾, because
   there is nothing to drop down. */
nav .menu-link{padding:8px 11px;border-radius:9px;display:flex;align-items:center;gap:7px;
  color:var(--fg);font-size:.95rem;white-space:nowrap;text-decoration:none}
nav .menu-link:hover{background:#1a212a}
nav .menu-link.on{background:#12283a;color:#cfe4ff}
.pop{position:absolute;top:calc(100% + 7px);left:0;min-width:200px;z-index:60;
  background:#161c24;border:1px solid var(--line);border-radius:11px;padding:6px;
  display:flex;flex-direction:column;gap:2px;box-shadow:0 16px 34px -12px #000c}
.pop.right{left:auto;right:0}
.pop a,.popbtn{display:block;width:100%;text-align:left;padding:10px 12px;border-radius:8px;
  color:var(--fg);font-size:.95rem;background:none;border:0;font-weight:400;cursor:pointer}
.pop a:hover,.popbtn:hover{background:#1f2732;text-decoration:none}
.pop a.cur{background:#12283a;color:var(--acc2);font-weight:600}
.pop a.danger-link{color:#f0a0a0;border-top:1px solid var(--line);border-radius:0 0 8px 8px;margin-top:2px}
.ava{width:26px;height:26px;border-radius:50%;background:#2a3444;color:var(--fg);
  display:inline-flex;align-items:center;justify-content:center;font-weight:700;font-size:.8rem}
.btn-sm{background:var(--acc);color:#06210f;padding:4px 10px;border-radius:6px;font-weight:600}
main{max-width:1360px;margin:20px auto;padding:0 18px}
footer{max-width:1360px;margin:24px auto;padding:12px 18px;color:var(--mut);font-size:.8rem;text-align:center}
/* Management pages (.card.wide) fill the big PC screen; forms/content (.card) — including
   ones nested inside a wide page — stay a readable centred column so inputs don't stretch. */
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px 20px;margin-bottom:16px;max-width:860px;margin-inline:auto}
.card.narrow{max-width:420px;margin-inline:auto}
.card.wide{max-width:none;margin-inline:0}
.card.center{text-align:center}
h1{margin:.2em 0 .6em;font-size:1.4rem}h2{font-size:1.1rem;margin:.2em 0 .6em}
.grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));align-items:start}
.form{display:flex;flex-direction:column;gap:12px}
.form label{display:flex;flex-direction:column;gap:4px;font-size:.9rem;color:var(--mut)}
.form label.check{flex-direction:row;align-items:center;gap:8px;color:var(--fg)}
input,select{background:#0f141a;border:1px solid var(--line);color:var(--fg);border-radius:8px;padding:9px 10px;font-size:1rem;width:100%}
input[type=checkbox]{width:auto}input[type=range]{padding:0}
button{background:var(--acc);color:#06210f;border:0;border-radius:8px;padding:10px 14px;font-weight:600;font-size:1rem;cursor:pointer}
button.danger{background:var(--err);color:#fff;padding:5px 10px;font-size:.85rem}
button.ok{background:var(--acc);padding:5px 10px;font-size:.85rem}
button.link{background:none;color:var(--acc2);padding:0;font-size:.8rem;font-weight:400;text-decoration:underline}
.inline{display:inline}.row{display:flex;gap:8px;margin-bottom:12px}.row input{flex:1}
.muted{color:var(--mut)}.small{font-size:.82rem}.center{text-align:center}
.alert{border-radius:8px;padding:10px 14px;margin-bottom:14px;font-size:.92rem}
.alert.info{background:#12283a;border:1px solid #245}.alert.err{background:#3a1414;border:1px solid #622;color:#f7bcbc}
.alert.ok{background:#123a20;border:1px solid #264;color:#b7f7c9}
.alert.warn{background:#3a2e12;border:1px solid #6a5320;color:#f3d99a}
.alert ul{margin:.3em 0 0;padding-left:1.1em}
.tag{display:inline-block;padding:1px 8px;border-radius:20px;font-size:.75rem;font-weight:600}
.tag.ham{background:#123a20;color:var(--acc)}.tag.pending{background:#3a3112;color:var(--warn)}
.tag.role{background:#12283a;color:var(--acc2)}.tag.ok{background:#123a20;color:var(--acc)}
.tag.off{background:#3a1414;color:var(--err)}
.who-big{font-size:1.15rem;font-weight:600;display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.tbl{width:100%;border-collapse:collapse;font-size:.9rem}
.tbl th,.tbl td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line);vertical-align:top}
.tbl th{color:var(--mut);font-weight:600}
.disabled-row{opacity:.5}
.nowrap{white-space:nowrap}
.gw-card{display:block;background:#0f141a;border:1px solid var(--line);border-radius:10px;padding:14px;color:var(--fg)}
.gw-card:hover{border-color:var(--acc2);text-decoration:none}
.gw-card.off{opacity:.6}
.gw-top{display:flex;align-items:center;gap:8px;justify-content:space-between;font-size:1.05rem}
.gw-stat{margin-top:8px;font-size:.9rem}
.dot{width:10px;height:10px;border-radius:50%;display:inline-block}
.dot.on{background:var(--acc);box-shadow:0 0 6px var(--acc)}.dot.off{background:var(--err)}
.btn-xs{background:#12283a;border:1px solid #245;color:var(--acc2);padding:4px 9px;border-radius:6px;font-size:.82rem}
.btn-xs:hover{text-decoration:none;border-color:var(--acc2)}
button.ghost{background:#0f141a;border:1px solid var(--line);color:var(--fg)}
.typebox{border:1px solid var(--line);border-radius:8px;padding:12px;background:#0f141a;display:none}
.tag.zello{background:#3a2312;color:#f39c12}.tag.mumble{background:#1c2b3a;color:#5dade2}.tag.app{background:#22303a;color:var(--mut)}
.sep{border:0;border-top:1px solid var(--line);margin:16px 0}
.dl{display:block;text-align:center;background:#12283a;border:1px solid #245;color:var(--acc2);padding:11px;border-radius:8px;font-weight:600}
.dl:hover{text-decoration:none;border-color:var(--acc2)}

/* ---- phones ----------------------------------------------------------------------------
   The portal is read standing up, one-handed, on a radio's screen. So: the nav becomes a
   drawer, every row of it is thumb-sized, and wide tables are allowed to scroll inside
   their card rather than dragging the whole page sideways. */
@media (max-width:820px){
  .topbar{flex-wrap:wrap;gap:8px}
  .hamb{display:block}
  .topbar nav{display:none;flex-direction:column;align-items:stretch;width:100%;margin-left:0;
    gap:6px;padding:6px 0 4px}
  .topbar nav.open{display:flex}
  .topbar nav.bare{display:flex;flex-direction:row;justify-content:flex-end;width:auto;margin-left:auto}
  nav .menu>summary{padding:13px 12px;font-size:1rem;background:#161c24;border:1px solid var(--line)}
  nav .menu-link{padding:13px 12px;font-size:1rem;background:#161c24;border:1px solid var(--line)}
  nav .menu>summary::after{margin-left:auto}
  /* dropdowns become inline sections — a floating panel inside a drawer is a trap */
  .pop{position:static;box-shadow:none;background:transparent;border:0;padding:2px 0 4px 12px;min-width:0}
  .pop a,.popbtn{padding:13px 12px;font-size:1rem;background:#141920;border:1px solid var(--line)}
  .pop a.danger-link{border-radius:8px;margin-top:0}
  .ava{width:24px;height:24px}
  /* a tick box on a room list is pressed with a thumb, standing up, wearing gloves */
  label.check{padding:7px 0}
  input[type=checkbox]{width:20px;height:20px}
  main{margin:14px auto;padding:0 12px}
  .card{padding:14px;border-radius:11px}
  h1{font-size:1.25rem}
  .grid{grid-template-columns:1fr;gap:12px}
  /* a table that must stay a table scrolls in its own box, not by moving the page */
  .scroll-x{overflow-x:auto;-webkit-overflow-scrolling:touch}
  .tbl th,.tbl td{padding:7px 8px}
  footer{margin:16px auto;padding-bottom:calc(12px + env(safe-area-inset-bottom))}
}
/* Running as an installed app: no address bar to scroll away, so nothing needs to make
   room for one — and the header is the only chrome the window has. */
html.standalone .topbar{position:sticky}
html.standalone footer{opacity:.75}