: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=search],input[type=password],input[type=number],input[type=date],input[type=datetime-local],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=search],input[type=password],input[type=number],input[type=date],input[type=datetime-local],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}
}

/* ---------- version 2: class pages, quizzes, results, teacher classes ---------- */
#nav{display:contents}
.topbar .btn.on{background:rgba(255,255,255,.3);border-color:rgba(255,255,255,.6);font-weight:600}
.page{max-width:1100px;margin:0 auto;padding:16px}
.page.narrow{max-width:780px}
.page.wide{max-width:1320px}
.hello{background:linear-gradient(120deg,#1f3864,#2e75b6);color:#fff;border-radius:12px;padding:16px 18px;margin-bottom:14px}
.hello h2{margin:0 0 4px;font-size:20px}
.hello p{margin:0;opacity:.9;font-size:14px;line-height:1.45}
.stat a{font-size:12.5px}
.item{display:flex;align-items:center;gap:12px;padding:11px 0;border-bottom:1px solid #eef1f6}
.item:last-child{border-bottom:0}
.item .main{flex:1;min-width:0}
.item .t{font-weight:600;font-size:14.5px}
.item .m{font-size:12.5px;color:var(--muted);margin-top:3px;line-height:1.4}
.item .side{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:flex-end}
.kind{display:inline-block;font-size:10.5px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--muted);margin-right:6px}
.pl-todo{background:var(--soft);color:#1b4a80}.pl-wait{background:#efeafd;color:#5b3fa8}.pl-good{background:#e3f5ea;color:#1d6b40}
.pl-warn{background:#fff3d6;color:#8a6200}.pl-bad{background:#fdecec;color:#9b2525}.pl-muted{background:#eceff3;color:#5b6475}
.feedback{background:#f6f8fc;border-left:3px solid var(--blue);padding:8px 10px;border-radius:0 6px 6px 0;font-size:13.5px;line-height:1.45;margin:8px 0}
.feedback b{display:block;font-size:12px;color:var(--muted);margin-bottom:2px}
.checks{list-style:none;padding:0;margin:6px 0}
.checks li{font-size:13px;line-height:1.4;padding:4px 0 4px 22px;position:relative}
.checks li::before{position:absolute;left:2px;top:4px;font-weight:700}
.checks li.y::before{content:'✔';color:var(--green)}.checks li.n::before{content:'✘';color:var(--red)}
.checks li small{display:block;color:var(--red)}
.score{font-size:30px;font-weight:700;color:var(--navy);line-height:1.1}
.score small{font-size:15px;color:var(--muted);font-weight:500}

/* quiz */
.qcard{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin-bottom:12px}
.qcard .qh{display:flex;justify-content:space-between;gap:10px;font-size:12px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.qcard .qt{font-size:15px;line-height:1.5;margin:6px 0 10px}
.opt{display:flex;align-items:flex-start;gap:9px;padding:9px 11px;border:1px solid var(--line);border-radius:8px;margin-bottom:7px;cursor:pointer;font-size:14px;line-height:1.4}
.opt:hover{background:#f8fafd}
.opt input{margin-top:2px;flex:none;width:17px;height:17px}
.opt.sel{border-color:var(--blue);background:var(--soft)}
.opt.right{border-color:#8fd0a9;background:#eefaf3}
.opt.wrong{border-color:#efb3b3;background:#fdf1f1}
.qcard textarea{font-family:inherit;font-size:14px;min-height:80px;resize:vertical}
.qmark{font-size:13px;margin-top:8px;padding-top:8px;border-top:1px dashed var(--line)}
.timer{position:sticky;top:0;z-index:20;background:#fff;border:1px solid var(--line);border-radius:10px;padding:9px 14px;margin-bottom:12px;display:flex;align-items:center;gap:12px;box-shadow:0 4px 14px rgba(31,56,100,.08)}
.timer b{font-size:20px;font-variant-numeric:tabular-nums;color:var(--navy)}
.timer .bar{flex:1;margin:0}
.timer.low b{color:var(--red)}.timer.low .bar i{background:var(--red)}
.qfoot{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:6px 0 30px}

/* results */
.bigtotal{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.bigtotal .score{font-size:44px}
.formula{font-family:ui-monospace,Consolas,monospace;font-size:13.5px;background:#f6f8fc;border-radius:8px;padding:10px 12px;margin:10px 0;line-height:1.6;overflow-x:auto}
table.list td.num,table.list th.num{text-align:right;white-space:nowrap}

/* teacher: classes */
.gradetabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px}
.gradetabs button{padding:9px 14px;font-size:14px;font-weight:600;border-radius:9px}
.gradetabs button small{display:block;font-size:11.5px;font-weight:400;color:var(--muted)}
.gradetabs button.on{background:var(--navy);border-color:var(--navy);color:#fff}
.gradetabs button.on small{color:#cfd9ea}
.subtabs{display:flex;gap:0;border-bottom:1px solid var(--line);margin-bottom:14px}
.subtabs button{border:0;border-radius:0;background:none;padding:9px 14px;font-weight:600;color:var(--muted);font-size:14px}
.subtabs button.on{color:var(--blue);box-shadow:inset 0 -2px 0 var(--blue)}
.toolbar{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:12px}
.toolbar .sp{flex:1}
select.small{width:auto;font-size:12.5px;padding:3px 6px}
.rule{display:flex;gap:6px;flex-wrap:wrap;align-items:center;border:1px solid var(--line);border-radius:8px;padding:8px 9px;margin-bottom:7px;background:#fbfcfe}
.rule select,.rule input{width:auto;font-size:13px;padding:5px 7px}
.rule input[type=number]{width:70px}
.rule input.name{width:120px}
.rule .desc{flex-basis:100%;font-size:12.5px;color:var(--navy)}
.rule .x{margin-left:auto}
.qedit{border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin-bottom:10px;background:#fbfcfe}
.qedit .qeh{display:flex;align-items:center;gap:6px;flex-wrap:wrap;margin-bottom:6px}
.qedit .qeh b{flex:1}
.qedit textarea{min-height:58px;font-family:inherit;font-size:14px}
.qedit .optrow{display:flex;align-items:center;gap:6px;margin:5px 0}
.qedit .optrow input[type=radio]{flex:none;width:17px;height:17px}
.qedit input[type=number]{width:80px}
.formcol{max-width:820px}
.formcol textarea{font-family:inherit;font-size:14px;min-height:90px;resize:vertical}
.inline{display:flex;gap:14px;flex-wrap:wrap;align-items:flex-end}
.inline > div{min-width:150px}
.inline input[type=datetime-local],.inline input[type=date]{width:auto;max-width:100%}
.checkline{display:flex;align-items:flex-start;gap:7px;font-size:13.5px;margin:9px 0;cursor:pointer;line-height:1.4}
.checkline input{margin-top:2px;flex:none}
.secs{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.secs label{display:flex;align-items:center;gap:4px;border:1px solid var(--line);border-radius:999px;padding:3px 10px;font-size:13px;cursor:pointer}
.tablewrap.book{max-height:70vh;overflow:auto}
table.book{border-collapse:separate;border-spacing:0;font-size:12.5px;min-width:100%}
table.book th,table.book td{border-bottom:1px solid #eef1f6;border-right:1px solid #f1f3f7;padding:6px 8px;white-space:nowrap;background:#fff}
table.book th{position:sticky;top:0;z-index:2;background:#f6f8fc;font-weight:600;text-align:center;vertical-align:bottom}
table.book th.vt{max-width:120px;white-space:normal;font-size:11.5px;line-height:1.25}
table.book td{text-align:center}
table.book td.nm,table.book th.nm{text-align:left;position:sticky;left:0;z-index:1;font-weight:600}
table.book th.nm{z-index:3}
table.book td.tot{font-weight:700;color:var(--navy);background:#f7f9fd}
table.book .mis{color:var(--red)}.book .wt{color:#8a6200}.book .op{color:#9aa3b2}
.modal.wide{max-width:720px;max-height:calc(100vh - 32px);overflow:auto}
.ans{background:#f6f8fc;border-radius:6px;padding:7px 9px;font-size:13.5px;line-height:1.45;white-space:pre-wrap;word-break:break-word}
.legend{font-size:12px;color:var(--muted);margin-top:8px;line-height:1.5}
@media (max-width:640px){
  .page{padding:10px}
  .hello{padding:13px 14px}
  .hello h2{font-size:18px}
  .item{flex-direction:column;align-items:stretch;gap:7px}
  .item .side{justify-content:flex-start}
  .item .side .btn,.item .side button{padding:8px 12px;font-size:13.5px}
  .bigtotal .score{font-size:36px}
  .qcard{padding:12px 13px}
  .gradetabs button{flex:1 1 40%;padding:8px 10px}
  .subtabs button{flex:1;padding:9px 6px}
  .rule select,.rule input{font-size:16px}
  .qedit input,.qedit textarea,.formcol input,.formcol textarea,.formcol select{font-size:16px}
}

/* undo / redo */
.tool.act:disabled{opacity:.4;cursor:default}
@media (min-width:641px) and (min-height:501px){#btnUndo,#btnRedo{display:inline-flex;width:calc(50% - 2px)}#btnUndo{margin-right:4px}}

/* ---------- version 2.2: payments ---------- */
.nb{display:inline-block;min-width:18px;height:18px;line-height:18px;padding:0 5px;border-radius:9px;background:#e5484d;color:#fff;font-size:11px;font-weight:700;text-align:center;vertical-align:1px}
.paygrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px;align-items:start}
.paycard{border:1px solid var(--line);border-radius:10px;padding:12px 14px;background:#fff;display:flex;flex-direction:column;gap:6px}
.paycard h3{margin:0;font-size:15.5px;color:var(--navy)}
.paycard .kind{margin:0}
.qrbox{display:flex;justify-content:center;background:#fff;border:1px solid var(--line);border-radius:8px;padding:8px}
.qrbox img{width:100%;max-width:230px;height:auto;display:block;cursor:zoom-in}
.acct{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.acct b{font-family:ui-monospace,Consolas,monospace;font-size:17px;letter-spacing:.03em;color:var(--navy)}
.ref{font-family:ui-monospace,Consolas,monospace;font-size:18px;font-weight:700;color:var(--navy);background:var(--soft);padding:2px 9px;border-radius:6px}
.fee{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:11px 0;border-bottom:1px solid #eef1f6}
.fee:last-child{border-bottom:0}
.fee .main{flex:1;min-width:200px}
.fee .t{font-weight:600;font-size:15px}
.fee .amt{font-size:18px;font-weight:700;color:var(--navy);white-space:nowrap}
.thumb{width:44px;height:44px;object-fit:cover;border-radius:6px;border:1px solid var(--line);cursor:zoom-in;vertical-align:middle}
.bigimg{display:block;max-width:100%;max-height:75vh;margin:0 auto;border-radius:6px}
.methodrow{display:flex;gap:12px;align-items:flex-start;border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin-bottom:9px;background:#fff}
.methodrow.off{opacity:.6;background:#f7f8fa}
.methodrow .qrmini{width:84px;height:84px;object-fit:contain;border:1px solid var(--line);border-radius:6px;background:#fff;flex:none}
.methodrow .noqr{width:84px;height:84px;border:1px dashed var(--line);border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:11px;color:var(--muted);text-align:center;flex:none}
.methodrow .main{flex:1;min-width:0}
.qrpick{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.qrpick img{width:110px;height:110px;object-fit:contain;border:1px solid var(--line);border-radius:6px;background:#fff}
.warnamt{color:#9b2525;font-weight:600}
@media (max-width:640px){
  .paygrid{grid-template-columns:1fr}
  .fee .amt{font-size:16px}
  .methodrow{flex-direction:column}
}

/* ---------- version 2.3: finance portal and the student payment page ---------- */
.pcards{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:12px;align-items:start}
.pcard{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 16px;display:flex;flex-direction:column;gap:10px}
.pc-head{display:flex;justify-content:space-between;gap:10px;align-items:flex-start}
.pc-head b{font-size:16px}
.pc-amt{font-size:22px;font-weight:700;color:var(--navy);text-align:right;white-space:nowrap}
.pc-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px 14px;font-size:14px}
.lbl{display:block;font-size:11.5px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.mono{font-family:ui-monospace,Consolas,monospace;font-size:15px;letter-spacing:.03em}
.pc-check{background:#eefaf3;border-radius:8px;padding:8px 10px;font-size:13.5px;line-height:1.45}
.pc-btns{display:flex;gap:8px;flex-wrap:wrap}
.pc-btns button{padding:10px 14px;font-size:14.5px}
.track{display:flex;gap:0;margin:6px 0 2px;counter-reset:st}
.track .st{flex:1;position:relative;text-align:center;font-size:12.5px;color:var(--muted);padding-top:30px;line-height:1.3}
.track .st::before{content:'';position:absolute;top:13px;left:-50%;width:100%;height:3px;background:#dfe5ee;z-index:0}
.track .st:first-child::before{display:none}
.track .st i{position:absolute;top:0;left:50%;transform:translateX(-50%);width:28px;height:28px;border-radius:50%;background:#dfe5ee;color:#fff;font-style:normal;font-weight:700;line-height:28px;font-size:14px;z-index:1}
.track .st.done{color:var(--navy)}
.track .st.done i,.track .st.done::before{background:var(--green)}
.track .st.now{color:var(--navy);font-weight:600}
.track .st.now i{background:var(--blue)}
.track .st.bad i{background:var(--red)}
.pricebox{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.pricebox .big{font-size:34px;font-weight:800;color:var(--navy);line-height:1}
.pricebox .per{font-size:14px;color:var(--muted)}
.stepno{display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:50%;background:var(--blue);color:#fff;font-weight:700;font-size:14px;margin-right:8px}
.paystate{border-radius:12px;padding:16px 18px;margin-bottom:14px;border:1px solid var(--line);background:#fff}
.paystate h2{margin:0 0 4px;font-size:20px}
.paystate.ok{background:#eefaf3;border-color:#bfe6cf;color:var(--ink)}
.paystate.ok h2{color:var(--green)}
.feedback.bad{border-left-color:var(--red);background:#fff5f5}
.paystate.wait{background:#f3f0fd;border-color:#d9d0f5}
.paystate.bad{background:#fdf1f1;border-color:#f1c7c7}
.chips{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:10px}
.chips button{border-radius:999px;padding:5px 12px;font-size:13px}
.chips button.on{background:var(--navy);border-color:var(--navy);color:#fff}
.trail{list-style:none;margin:6px 0;padding:0}
.trail li{position:relative;padding:0 0 12px 22px;font-size:13.5px;line-height:1.45}
.trail li::before{content:'';position:absolute;left:5px;top:5px;width:9px;height:9px;border-radius:50%;background:var(--blue)}
.trail li::after{content:'';position:absolute;left:9px;top:16px;bottom:0;width:1px;background:var(--line)}
.trail li:last-child::after{display:none}
.trail li.g::before{background:var(--green)}.trail li.r::before{background:var(--red)}
@media (max-width:640px){
  .pcards{grid-template-columns:1fr}
  .pc-grid{grid-template-columns:1fr 1fr}
  .pc-btns button{flex:1}
  .pricebox .big{font-size:28px}
  .track .st{font-size:11.5px}
}