:root{--bg:#f3f5f9;--panel:#fff;--ink:#1d2433;--muted:#5b6475;--line:#d9dee8;--navy:#1f3864;--blue:#2e75b6;--green:#239256;--red:#cf3b3b;--amber:#c98a00;--soft:#eaf1fb}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:var(--bg)}
a{color:var(--blue)}
[hidden]{display:none!important}
button,.btn{font:inherit;font-size:13px;padding:6px 11px;border-radius:6px;border:1px solid var(--line);background:#fff;color:var(--ink);cursor:pointer;text-decoration:none;display:inline-block;line-height:1.3}
button:hover,.btn:hover{background:#f6f8fc}
button,.btn,label,.tool{touch-action:manipulation;-webkit-tap-highlight-color:transparent}
button:disabled{opacity:.55;cursor:default}
button.primary,.btn.primary{background:var(--blue);border-color:var(--blue);color:#fff}
button.primary:hover,.btn.primary:hover{background:#2867a0}
button.danger,.btn.danger{color:var(--red);border-color:#f0c4c4}
button.primary.red{background:var(--red);border-color:var(--red)}
button.primary.red:hover{background:#b53030}
button.good{color:var(--green);border-color:#a9dcbd}
button.small,.btn.small{font-size:12px;padding:3px 8px}
input[type=text],input[type=password],select,textarea{width:100%;font:inherit;font-size:14px;padding:7px 9px;border:1px solid var(--line);border-radius:6px;background:#fff;color:var(--ink)}
input:focus,select:focus,textarea:focus{outline:2px solid #b9d3f0;border-color:var(--blue)}
label.f{display:block;font-size:12px;color:var(--muted);margin:10px 0 4px;font-weight:600}
.note{font-size:12px;color:var(--muted);margin-top:4px;line-height:1.45}
.ok{color:var(--green)}.err{color:var(--red)}
code{font-family:ui-monospace,Consolas,monospace;background:#f1f3f7;padding:0 4px;border-radius:4px}

/* top bar */
.topbar{display:flex;align-items:center;gap:10px;padding:8px 14px;background:var(--navy);color:#fff;flex-wrap:wrap}
.topbar h1{font-size:17px;margin:0;font-weight:700;letter-spacing:.2px}
.topbar h1 span{font-weight:400;opacity:.8}
.topbar .sub{font-size:12px;opacity:.75}
.topbar .sp{flex:1}
.topbar button,.topbar .btn{background:rgba(255,255,255,.1);color:#fff;border:1px solid rgba(255,255,255,.28)}
.topbar button:hover,.topbar .btn:hover{background:rgba(255,255,255,.2)}
.topbar label{font-size:12px;display:flex;align-items:center;gap:4px;opacity:.9;cursor:pointer}
.who{font-size:13px;opacity:.95;max-width:260px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.menubtn{display:none}
.menu{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.chip{font-size:12px;padding:3px 9px;border-radius:999px;background:rgba(255,255,255,.14);white-space:nowrap}
.chip.bad{background:#cf3b3b}

/* toast & modal */
#toast{position:fixed;left:50%;top:62px;transform:translateX(-50%);padding:9px 16px;border-radius:999px;font-weight:600;font-size:14px;color:#fff;opacity:0;transition:opacity .25s;pointer-events:none;max-width:90%;text-align:center;z-index:60}
#toast.show{opacity:1}
.modal-back{position:fixed;inset:0;background:rgba(15,25,45,.45);display:flex;align-items:center;justify-content:center;z-index:50;padding:16px}
.modal{background:#fff;border-radius:12px;padding:20px 22px;width:100%;max-width:420px;box-shadow:0 12px 40px rgba(0,0,0,.25)}
.modal h2{margin:0 0 6px;font-size:18px;color:var(--navy)}
.modal .row{display:flex;gap:8px;justify-content:flex-end;margin-top:16px}
.msg{font-size:13px;margin-top:10px;min-height:1em;line-height:1.4}
.msg.err{color:var(--red)}.msg.ok{color:var(--green)}

/* sign-in / register */
.authwrap{min-height:100%;display:flex;align-items:center;justify-content:center;padding:24px}
.authcard{background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 8px 30px rgba(31,56,100,.08);width:100%;max-width:420px;padding:26px 28px}
.brand{display:flex;align-items:center;gap:10px;margin-bottom:4px}
.brand .logo{width:40px;height:40px;border-radius:10px;background:var(--navy);display:flex;align-items:center;justify-content:center;flex:none}
.brand h1{margin:0;font-size:23px;color:var(--navy)}
.authcard .lead{color:var(--muted);font-size:13.5px;margin:4px 0 16px}
.authcard button.primary{width:100%;padding:10px;font-size:15px;margin-top:18px}
.authcard .alt{text-align:center;font-size:13.5px;margin-top:16px}
.check{display:flex;align-items:center;gap:6px;font-size:13px;margin-top:12px;color:var(--muted);cursor:pointer}
.banner{border-radius:8px;padding:10px 12px;font-size:13.5px;margin-bottom:12px;line-height:1.45}
.banner.info{background:var(--soft);color:#1b4a80}.banner.warn{background:#fff6dd;color:#7a5a00}.banner.bad{background:#fdecec;color:#9b2525}.banner.good{background:#eaf7ef;color:#1d6b40}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:0 10px}

/* lab */
body.labpage{display:flex;flex-direction:column;overflow:hidden}
#viewBanner{background:#fff6dd;color:#6b4f00;font-size:13px;padding:7px 14px;border-bottom:1px solid #f0dfa6}
.labmain{flex:1;display:grid;grid-template-columns:200px 1fr 310px;min-height:0}
#left{background:var(--panel);overflow:auto;border-right:1px solid var(--line);padding:8px 10px 14px}
.sec{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin:12px 2px 6px}
.tool{display:flex;align-items:center;gap:8px;width:100%;text-align:left;margin-bottom:4px;padding:4px 8px;min-height:34px;-webkit-user-select:none;user-select:none}
.tool svg{width:34px;height:26px;flex:none}
.tool.active{background:var(--soft);border-color:var(--blue);box-shadow:inset 0 0 0 1px var(--blue)}
.swatch{width:34px;height:0;border-top:4px solid;flex:none}
.swatch.dash{border-top-style:dashed}.swatch.dot{border-top-style:dotted}
#stage{position:relative;min-width:0;min-height:0}
#scroller{position:absolute;inset:0;overflow:auto;background:#fff}
#canvas{width:100%;height:100%;display:block;background-color:#fff;background-image:radial-gradient(#dde3ee 1px,transparent 1px);background-size:22px 22px;touch-action:none;user-select:none}
#hint{position:absolute;left:12px;bottom:12px;background:rgba(31,56,100,.93);color:#fff;font-size:13px;padding:7px 11px;border-radius:7px;max-width:72%;pointer-events:none;line-height:1.35;transition:opacity .6s}
#hint.faded{opacity:0}
#right{background:var(--panel);border-left:1px solid var(--line);display:flex;flex-direction:column;min-height:0}
.tabs{display:flex;border-bottom:1px solid var(--line);flex:none}
.tabs button{flex:1;border:0;border-radius:0;padding:9px 4px;background:#f7f8fb;font-weight:600;color:var(--muted)}
.tabs button.on{background:#fff;box-shadow:inset 0 -2px 0 var(--blue);color:var(--blue)}
.pane{flex:1;overflow:auto;padding:12px 13px}
.pane h2{font-size:16px;margin:0 0 2px}
.pane h3{font-size:13px;margin:14px 0 6px;color:var(--navy)}
.pane p{font-size:13px;line-height:1.45;margin:6px 0}
.pane ul,.pane ol{font-size:13px;line-height:1.45;padding-left:18px;margin:6px 0}
.pane input[type=text]{font-size:14px;padding:6px 8px}
.pane textarea{font-family:ui-monospace,Consolas,monospace;font-size:11px;height:80px}
#logwrap{flex:none;border-top:1px solid var(--line);background:#fbfcfe}
#logwrap .sec{margin:6px 10px 2px;display:flex;justify-content:space-between;align-items:center}
#logwrap .sec button{font-size:11px;padding:2px 7px}
#log{height:150px;overflow:auto;font-size:12px;padding:2px 10px 8px;font-family:ui-monospace,Consolas,"Courier New",monospace;line-height:1.4}
.l-ok{color:var(--green)}.l-err{color:var(--red)}.l-info{color:var(--muted)}.l-cmd{color:var(--navy);font-weight:700}
input.bad{border-color:var(--red);background:#fff6f6}
.card{border:1px solid var(--line);border-radius:8px;padding:10px 11px;margin-bottom:9px;background:#fff}
.card.done{border-color:#9fd5b5;background:#f2fbf6}
.badge{display:inline-block;font-size:11px;font-weight:700;padding:1px 7px;border-radius:999px;background:var(--soft);color:var(--blue);margin-right:4px}
.badge.g10{background:#f3ecfb;color:#6b3fb0}
.res{font-size:12.5px;margin-top:8px;line-height:1.4}
.row{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}
.portrow{border:1px solid var(--line);border-radius:7px;padding:7px 9px;margin:7px 0;font-size:12.5px}
.portrow b{color:var(--navy)}
table.mini{border-collapse:collapse;font-size:12px;width:100%;margin:6px 0}
table.mini td,table.mini th{border:1px solid var(--line);padding:4px 6px;text-align:left;vertical-align:top}
table.mini th{background:#f4f6fa}
.devname{font-size:12px;font-weight:600;fill:#1d2433}
.devip{font-size:11px;fill:#5b6475}
.portlbl{font-size:10px;fill:#5b6475}
.dev{cursor:pointer}
.empty{color:var(--muted);font-size:13px}
@media (max-width:900px){.labmain{grid-template-columns:150px 1fr;grid-template-rows:1fr 42vh}#right{grid-column:1/-1;border-left:0;border-top:1px solid var(--line)}#log{height:80px}.topbar .sub{display:none}}

/* admin */
.admin{max-width:1240px;margin:0 auto;padding:16px}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:14px}
.stat{background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 14px}
.stat b{display:block;font-size:26px;color:var(--navy);line-height:1.1}
.stat span{font-size:12.5px;color:var(--muted)}
.stat.alert{border-color:#f0d58a;background:#fffaf0}
.box{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin-bottom:14px}
.box h2{font-size:16px;margin:0 0 8px;color:var(--navy)}
.box h3{font-size:14px;margin:16px 0 6px;color:var(--navy)}
.boxhead{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:10px}
.boxhead h2{margin:0;flex:1;min-width:180px}
.filters{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.filters input{width:210px}.filters select{width:auto}
.tablewrap{overflow-x:auto}
table.list{border-collapse:collapse;width:100%;font-size:13px}
table.list th{text-align:left;font-size:11.5px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);padding:7px 8px;border-bottom:1px solid var(--line);white-space:nowrap}
table.list td{padding:7px 8px;border-bottom:1px solid #eef1f6;vertical-align:middle}
table.list tr:hover td{background:#fafbfd}
table.list td.nm{font-weight:600}
.acts{display:flex;gap:4px;flex-wrap:wrap}
.pill{display:inline-block;font-size:11.5px;font-weight:700;padding:2px 8px;border-radius:999px;white-space:nowrap}
.pill.count{background:#fff3d6;color:#8a6200;margin-left:6px;font-size:12px}
.st-pending{background:#fff3d6;color:#8a6200}.st-approved{background:#e3f5ea;color:#1d6b40}.st-rejected{background:#fdecec;color:#9b2525}.st-disabled{background:#eceff3;color:#5b6475}
.dots{display:inline-flex;gap:3px;vertical-align:middle;margin-right:6px}
.dots i{width:9px;height:9px;border-radius:50%;background:#e1e6ee;display:inline-block}
.dots i.on{background:var(--green)}
.two{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.formgrid{display:grid;grid-template-columns:1fr 1fr;gap:0 10px}
.formgrid .full{grid-column:1/-1}
.box form button.primary{margin-top:12px}
.evt{font-size:12.5px;padding:6px 0;border-bottom:1px solid #eef1f6;line-height:1.4}
.evt time{color:var(--muted);margin-right:6px;white-space:nowrap}
.evlist{max-height:330px;overflow:auto}
.bar{height:8px;background:#e9edf3;border-radius:999px;overflow:hidden;margin-top:4px}
.bar i{display:block;height:100%;background:var(--green)}
.chrow{padding:7px 0;border-bottom:1px solid #eef1f6;font-size:13px}
.chrow small{color:var(--muted)}
.temppw{font-family:ui-monospace,Consolas,monospace;font-size:28px;letter-spacing:3px;background:var(--soft);padding:12px;border-radius:8px;text-align:center;margin:10px 0;user-select:all}
@media(max-width:820px){.stats{grid-template-columns:1fr 1fr}.two{grid-template-columns:1fr}.formgrid{grid-template-columns:1fr}}

/* ---------- phones (portrait and landscape) ---------- */
@media (max-width:640px),(max-height:500px){
  .topbar{position:relative;flex-wrap:nowrap;padding:6px 10px;gap:8px}
  .topbar h1{font-size:16px;white-space:nowrap}
  .topbar .sub{display:none}
  .menubtn{display:inline-block;flex:none}
  .menu{display:none;position:absolute;right:8px;top:100%;margin-top:4px;z-index:40;flex-direction:column;align-items:stretch;gap:6px;background:var(--navy);padding:10px;border-radius:10px;box-shadow:0 10px 30px rgba(0,0,0,.35);min-width:230px;max-width:calc(100vw - 16px);max-height:calc(100vh - 70px);overflow:auto}
  .menu.open{display:flex}
  .menu .who{max-width:none;white-space:normal;padding:0 2px 8px;border-bottom:1px solid rgba(255,255,255,.2)}
  .menu button,.menu .btn{text-align:left;padding:9px 12px;font-size:14px}
  .menu label{padding:5px 2px;font-size:14px}
  .chip{font-size:11.5px;padding:3px 8px;overflow:hidden;text-overflow:ellipsis;min-width:0}
  input[type=text],input[type=password],select,textarea,.pane input[type=text],.pane textarea{font-size:16px}
  .pane textarea#code{font-size:12px}
  #hint{font-size:12px;left:8px;bottom:8px;max-width:calc(100% - 16px);padding:5px 9px}
  #toast{top:52px;font-size:13px}
  .authwrap{padding:12px}
  .authcard{padding:20px 18px}
  .modal{padding:16px 16px}
}
/* portrait phones: tools in a strip at the top, settings below the workspace */
@media (max-width:640px){
  .labmain{grid-template-columns:1fr;grid-template-rows:auto 1fr 40vh;grid-template-rows:auto 1fr 40dvh}
  #left{display:flex;align-items:stretch;gap:6px;overflow-x:auto;overflow-y:hidden;padding:6px 8px;border-right:0;border-bottom:1px solid var(--line)}
  #left .sec{display:none}
  #palEnd,#palNet,#palCable{display:contents}
  .tool{flex:none;width:auto;flex-direction:column;justify-content:center;gap:2px;margin:0;padding:4px 8px;min-height:0;font-size:11px;white-space:nowrap}
  .tool svg{width:28px;height:21px}
  .swatch{width:28px;margin:8px 0 7px}
  #right{grid-column:auto;border-left:0;border-top:1px solid var(--line)}
  .tabs button{padding:8px 2px;font-size:12.5px}
  .pane{padding:10px 11px}
  #log{height:66px}
  #viewBanner{font-size:12px;padding:6px 10px}
  /* teacher panel */
  .admin{padding:10px}
  .stats{gap:8px}
  .stat{padding:10px 11px}
  .stat b{font-size:22px}
  .box{padding:12px}
  .filters{width:100%}
  .filters input{width:100%}
  .filters select{flex:1 1 40%;min-width:0}
  table.list thead{display:none}
  table.list,table.list tbody,table.list tr{display:block}
  table.list tr{border:1px solid var(--line);border-radius:9px;padding:9px 11px;margin-bottom:9px;background:#fff}
  table.list tr:hover td{background:none}
  table.list td{display:inline-block;border:0;padding:2px 12px 2px 0;font-size:13px}
  table.list td.nm,table.list td.ac,table.list td.empty{display:block;padding-right:0}
  table.list td.nm{font-size:15px}
  table.list td[data-l]::before{content:attr(data-l) ": ";color:var(--muted);font-size:12px}
  table.list td.ac .acts{margin-top:7px}
  table.list td.ac button,table.list td.ac .btn{padding:6px 10px;font-size:13px}
}
/* landscape phones: narrow tool column, settings on the right */
@media (max-height:500px) and (min-width:641px){
  .labmain{grid-template-columns:86px 1fr 280px;grid-template-rows:1fr}
  #right{grid-column:auto;border-left:1px solid var(--line);border-top:0}
  #left{padding:4px 5px}
  #left .sec{font-size:9px;margin:7px 1px 3px;letter-spacing:.02em}
  .tool{flex-direction:column;justify-content:center;gap:1px;padding:3px 2px;min-height:0;font-size:10.5px;text-align:center;line-height:1.15}
  .tool svg{width:26px;height:20px}
  .swatch{width:26px;margin:6px 0}
  #log{height:56px}
  .pane{padding:9px 10px}
}