[hidden]{display:none!important}
:root{
  --navy:#0d2350; --navy-2:#162f66; --navy-3:#0a1b3f;
  --gold:#FFC72C; --gold-2:#8A6300;
  --bg:#EEF1F7; --surface:#fff; --ink:#101a33; --ink-2:#4a5570; --line:#DCE1EC;
  --on-navy:#E8ECF6; --on-navy-2:#A9B6D3;
  --ok:#1a8f3c; --warn:#d98a00; --bad:#c62828;
  --sans:"Commissioner","Segoe UI",system-ui,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,Consolas,monospace;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:15px;line-height:1.45}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--gold);outline-offset:2px}
a{color:inherit}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:10px;padding:11px 18px;font-weight:700;cursor:pointer;text-decoration:none;background:var(--navy);color:#fff}
.btn:hover{background:var(--navy-2)}
.btn.gold{background:var(--gold);color:var(--navy)}
.btn.gold:hover{filter:brightness(.96)}
.btn.ghost{background:transparent;color:var(--navy);border:1.5px solid var(--line)}
.btn.ghost:hover{border-color:var(--navy)}
.btn.danger{background:var(--bad)}
.btn:disabled{opacity:.55;cursor:default}
.field{display:flex;flex-direction:column;gap:6px;font-weight:600;font-size:.9rem}
.field input,.field select{border:1.5px solid var(--line);border-radius:10px;padding:11px 12px;background:#fff;font-weight:500;font-size:1rem;width:100%}
.field input:focus,.field select:focus{border-color:var(--navy);outline:none}
.muted{color:var(--ink-2)}
.err{color:var(--bad);font-weight:600;min-height:1.2em}

/* ---------- κάρτες εισόδου ---------- */
.gate{min-height:100%;display:grid;place-items:center;padding:24px 16px;background:radial-gradient(120% 90% at 80% 10%,#1d4aa8 0%,var(--navy) 55%,var(--navy-3) 100%)}
.card{background:var(--surface);border-radius:18px;box-shadow:0 20px 60px rgba(0,0,0,.28);width:100%;max-width:880px;overflow:hidden}
.card.narrow{max-width:440px}
.card-head{display:flex;align-items:center;gap:12px;padding:18px 24px;border-bottom:1px solid var(--line)}
.mk{width:38px;height:38px;border-radius:10px;background:var(--gold);color:var(--navy);display:grid;place-items:center;font-weight:800;flex:none}
.card-head b{display:block;font-size:1rem}
.card-head small{color:var(--ink-2)}
.card-body{padding:24px;display:grid;gap:18px}
.pre{display:grid;grid-template-columns:1.25fr 1fr;gap:24px;align-items:start}
.preview{position:relative;aspect-ratio:16/9;background:#0b1530;border-radius:14px;overflow:hidden;display:grid;place-items:center}
.preview video{width:100%;height:100%;object-fit:cover;transform:scaleX(-1)}
.preview .off{color:var(--on-navy-2);font-weight:600}
.preview .ctrls{position:absolute;bottom:12px;left:0;right:0;display:flex;justify-content:center;gap:10px}
.meter{height:6px;border-radius:3px;background:var(--line);overflow:hidden}
.meter i{display:block;height:100%;width:0;background:var(--ok);transition:width .08s}
.who{display:flex;align-items:center;gap:10px;padding:12px 14px;background:#FFF7DD;border-radius:10px;font-weight:600;color:var(--navy)}
@media (max-width:720px){.pre{grid-template-columns:1fr}}

/* ---------- στρογγυλά κουμπιά ελέγχου ---------- */
.rb{width:46px;height:46px;border-radius:50%;border:0;display:grid;place-items:center;cursor:pointer;background:rgba(255,255,255,.14);color:#fff;position:relative;flex:none}
.rb:hover{background:rgba(255,255,255,.24)}
.rb svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.rb.offstate{background:var(--bad)}
.rb.onstate{background:var(--gold);color:var(--navy)}
.rb.end{background:var(--bad);width:auto;border-radius:23px;padding:0 18px;font-weight:700;gap:8px;display:flex;align-items:center}
.preview .rb{background:rgba(0,0,0,.45)}
.preview .rb.offstate{background:var(--bad)}

/* ---------- τάξη ---------- */
.app{height:100%;display:grid;grid-template-rows:auto 1fr}
.top{background:var(--navy);color:var(--on-navy);display:flex;align-items:center;gap:12px;padding:8px 14px;min-width:0}
.top .title{min-width:0;flex:1;display:flex;align-items:center;gap:10px}
.top .title b{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:block;color:#fff}
.top .title small{color:var(--on-navy-2);font-family:var(--mono);font-size:.78rem}
.top .ctl{display:flex;gap:8px;align-items:center}
.net{font-size:.78rem;padding:3px 8px;border-radius:999px;background:var(--bad);color:#fff;font-weight:700}

.room{display:grid;grid-template-columns:minmax(0,1fr) 320px;min-height:0}
.work{display:grid;grid-template-rows:auto 1fr;min-height:0;min-width:0}
.tabs{display:flex;gap:4px;padding:8px 10px 0;background:var(--bg);overflow-x:auto}
.tab{border:0;background:transparent;padding:9px 14px;border-radius:10px 10px 0 0;font-weight:700;color:var(--ink-2);cursor:pointer;white-space:nowrap}
.tab[aria-selected=true]{background:var(--surface);color:var(--navy);box-shadow:0 -2px 0 var(--gold) inset}
.tab .dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--bad);margin-left:6px;vertical-align:middle;animation:pulse 1.4s infinite}
@keyframes pulse{50%{opacity:.35}}
.panel{background:var(--surface);min-height:0;min-width:0;display:flex;flex-direction:column}

.side{border-left:1px solid var(--line);background:var(--surface);display:grid;grid-template-rows:auto 1fr;min-height:0}
.tiles{display:grid;grid-template-columns:1fr 1fr;gap:6px;padding:8px;max-height:52vh;overflow:auto;background:#0b1530}
.tiles.solo{grid-template-columns:1fr}
.tile{position:relative;aspect-ratio:4/3;background:#13224a;border-radius:10px;overflow:hidden;display:grid;place-items:center;outline:3px solid transparent;transition:outline-color .15s}
.tile.talk{outline-color:var(--ok)}
.tile video{width:100%;height:100%;object-fit:cover}
.tile.me video{transform:scaleX(-1)}
.tile .av{width:54px;height:54px;border-radius:50%;background:var(--gold);color:var(--navy);display:grid;place-items:center;font-weight:800;font-size:1.2rem}
.tile .nm{position:absolute;left:6px;bottom:6px;right:6px;display:flex;align-items:center;gap:5px;font-size:.76rem;font-weight:700;color:#fff;text-shadow:0 1px 2px #000}
.tile .nm span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tile .st{width:8px;height:8px;border-radius:50%;background:var(--ok);flex:none}
.tile .st.connecting,.tile .st.new{background:var(--warn)}
.tile .st.failed,.tile .st.lost{background:var(--bad)}
.tile .ic{flex:none;width:16px;height:16px;fill:none;stroke:#fff;stroke-width:2.2;stroke-linecap:round}
.tile .hand{position:absolute;top:6px;left:6px;font-size:1.4rem;animation:wave 1s infinite}
@keyframes wave{50%{transform:rotate(18deg)}}
.tile .tmenu{position:absolute;top:6px;right:6px;display:none;gap:4px}
.tile:hover .tmenu,.tile:focus-within .tmenu{display:flex}
.tile .tmenu button{border:0;border-radius:8px;background:rgba(0,0,0,.6);color:#fff;font-size:.72rem;font-weight:700;padding:4px 7px;cursor:pointer}
.tile .msg{position:absolute;inset:auto 6px 28px 6px;font-size:.72rem;color:#ffd6d6;text-align:center}
.tile .teach{font-size:.68rem;background:var(--gold);color:var(--navy);border-radius:4px;padding:0 4px;flex:none}

.chat{display:grid;grid-template-rows:auto 1fr auto;min-height:0}
.chat h2{font-size:.82rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-2);margin:0;padding:10px 12px 6px}
.msgs{overflow:auto;padding:4px 12px 10px;display:flex;flex-direction:column;gap:8px}
.m{max-width:92%;align-self:flex-start;background:var(--bg);border-radius:12px;padding:7px 10px;word-wrap:break-word;overflow-wrap:anywhere}
.m.mine{align-self:flex-end;background:#E3EAFB}
.m b{display:block;font-size:.74rem;color:var(--navy)}
.m .tm{font-size:.68rem;color:var(--ink-2);margin-left:6px;font-weight:500}
.m.sys{align-self:center;background:transparent;color:var(--ink-2);font-size:.8rem;padding:0;text-align:center}
.m .fl{display:flex;align-items:center;gap:8px;text-decoration:none;font-weight:600;color:var(--navy)}
.m .fl small{color:var(--ink-2);font-weight:500}
.m img.th{max-width:100%;border-radius:8px;margin-top:6px;display:block}
.compose{display:flex;gap:6px;padding:8px;border-top:1px solid var(--line)}
.compose input[type=text]{flex:1;min-width:0;border:1.5px solid var(--line);border-radius:10px;padding:9px 10px}
.compose input[type=text]:focus{outline:none;border-color:var(--navy)}
.ib{border:0;background:var(--bg);border-radius:10px;width:40px;display:grid;place-items:center;cursor:pointer;flex:none}
.ib:hover{background:var(--line)}
.ib svg{width:20px;height:20px;fill:none;stroke:var(--navy);stroke-width:2;stroke-linecap:round;stroke-linejoin:round}

/* ---------- πίνακας ---------- */
.board{display:flex;flex-direction:column;min-height:0;flex:1}
.bd-bar{display:flex;flex-wrap:wrap;gap:6px;align-items:center;padding:8px 10px;border-bottom:1px solid var(--line);background:var(--surface)}
.bd-bar .grp{display:flex;gap:2px;align-items:center;padding-right:6px;border-right:1px solid var(--line)}
.bd-bar .grp:last-child{border-right:0}
.bd-bar .grp.sp{margin-left:auto}
.tb{border:0;background:transparent;width:34px;height:34px;border-radius:8px;display:grid;place-items:center;cursor:pointer;color:var(--navy);font-weight:700;list-style:none}
.tb::-webkit-details-marker{display:none}
.tb.wide{width:auto;min-width:34px;padding:0 8px}
.tb:hover{background:var(--bg)}
.tb.on{background:var(--navy);color:#fff}
.tb svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.tb svg.thick{stroke-width:2.6}
.tb.wd i{display:block;width:18px;height:var(--w);border-radius:4px;background:currentColor}
.sw{width:22px;height:22px;border-radius:50%;border:2px solid #fff;background:var(--c);box-shadow:0 0 0 1px var(--line);cursor:pointer;margin:0 1px}
.sw.on{box-shadow:0 0 0 2px var(--navy)}
.bd-bar select{border:1.5px solid var(--line);border-radius:8px;padding:5px 6px;background:#fff;font-size:.85rem}
.pg{font-family:var(--mono);font-size:.82rem;min-width:46px;text-align:center}
.menu{position:relative}
.menu summary{cursor:pointer}
.menu .pop{position:absolute;z-index:20;top:40px;left:0;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 12px 30px rgba(13,35,80,.18);padding:6px;display:flex;flex-direction:column;min-width:220px}
.menu.end .pop{left:auto;right:0}
.menu .pop button,.menu .pop .chk{border:0;background:transparent;text-align:left;padding:9px 10px;border-radius:8px;cursor:pointer;font-weight:600;display:flex;gap:8px;align-items:center}
.menu .pop button:hover{background:var(--bg)}
.bd-stage{flex:1;min-height:0;overflow:auto;background:#E4E8F1;display:grid;place-items:start center;padding:8px}
.bd-sheet{position:relative;box-shadow:0 2px 12px rgba(13,35,80,.15);background:#fff}
.bd-sheet canvas{position:absolute;inset:0;display:block}
.bd-over{touch-action:none;cursor:crosshair}
.bd-over[data-tool=laser]{cursor:none}
.bd-over[data-tool=text]{cursor:text}
.bd-over[data-tool=eraser]{cursor:cell}
.bd-text{position:absolute;z-index:5;min-width:160px;border:1.5px dashed var(--navy);background:rgba(255,255,255,.92);padding:0 4px;resize:none;font-family:var(--sans);font-weight:500;line-height:1.3;overflow:hidden}

/* ---------- οθόνη & εργαστήρια ---------- */
.screen{flex:1;background:#0b1530;display:grid;place-items:center;min-height:0;position:relative}
.screen video{max-width:100%;max-height:100%;width:100%;height:100%;object-fit:contain}
.screen .cap{position:absolute;top:10px;left:12px;color:#fff;font-weight:700;background:rgba(0,0,0,.45);padding:4px 10px;border-radius:8px;font-size:.85rem}
.labs{padding:18px;overflow:auto;display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px;align-content:start}
.lab{border:1.5px solid var(--line);border-radius:14px;padding:14px;display:flex;flex-direction:column;gap:6px;background:#fff;text-align:left;cursor:pointer}
.lab:hover{border-color:var(--navy)}
.lab .tg{font-size:.72rem;font-weight:700;color:var(--gold-2);letter-spacing:.04em}
.lab b{color:var(--navy)}
.lab span{font-size:.85rem;color:var(--ink-2)}
.labhead{display:flex;gap:8px;align-items:center;padding:8px 10px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.labhead b{flex:1;color:var(--navy);min-width:0}
.labframe{flex:1;border:0;width:100%;min-height:0;background:#fff}
.sbtn{border:1.5px solid var(--line);background:#fff;border-radius:9px;padding:6px 12px;font-weight:700;cursor:pointer;color:var(--navy);font-size:.85rem}
.sbtn:hover{border-color:var(--navy)}
.sbtn.gold{background:var(--gold);border-color:var(--gold)}

.toast{position:fixed;left:50%;bottom:22px;transform:translateX(-50%);background:var(--navy);color:#fff;padding:11px 18px;border-radius:12px;box-shadow:0 10px 30px rgba(0,0,0,.3);font-weight:600;z-index:100;max-width:calc(100% - 32px);text-align:center}
.pop2{position:absolute;right:14px;top:58px;z-index:30;background:#fff;color:var(--ink);border-radius:14px;box-shadow:0 16px 40px rgba(0,0,0,.25);padding:16px;display:grid;gap:12px;width:300px;max-width:calc(100vw - 28px)}

@media (max-width:900px){
  body{font-size:14px}
  .app{height:auto;min-height:100%}
  .room{grid-template-columns:1fr}
  .work{height:78vh;height:78dvh}
  .side{border-left:0;border-top:1px solid var(--line)}
  .tiles{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));max-height:none}
  .chat{height:420px}
  .rb{width:40px;height:40px}
  .top .title small{display:none}
  .top{flex-wrap:wrap}
}
.unmute{position:fixed;left:50%;top:50%;transform:translate(-50%,-50%);z-index:120;background:var(--gold,#FFC72C);color:#0d2350;border:0;border-radius:16px;padding:20px 26px;font:700 1.1rem/1.3 inherit;box-shadow:0 14px 40px rgba(0,0,0,.35);cursor:pointer;max-width:calc(100% - 32px)}
.unmute[hidden]{display:none}