:root{--bg:#f6f8f7;--card:#fff;--ink:#1f2a24;--muted:#66736b;--line:#e1e7e3;--green:#0f9d58;--green-d:#0b7a44;--green-l:#e6f4ea;--red:#d93025;--red-l:#fce8e6;--amber:#f9ab00}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6}
.hidden{display:none!important}
.topbar{display:flex;justify-content:space-between;align-items:center;padding:12px 24px;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.brand{font-weight:700;font-size:1.15rem;color:var(--ink);text-decoration:none}
.brand span{color:var(--green);font-weight:600;margin-left:4px}
.mainnav{display:flex;gap:20px;margin-left:auto;margin-right:20px}
.mainnav a{color:var(--ink);text-decoration:none;font-size:.92rem}
.mainnav a:hover{color:var(--green)}
@media(max-width:600px){.topbar{flex-wrap:wrap;gap:8px}.mainnav{order:3;width:100%;margin:0}}
.userbox{display:flex;align-items:center;gap:12px;font-size:.9rem;color:var(--muted)}
.btn{background:var(--green);color:#fff;border:0;border-radius:8px;padding:10px 18px;font-size:.95rem;cursor:pointer;font-weight:600;text-decoration:none;display:inline-block}
.btn:hover{background:var(--green-d)}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}
.btn.ghost:hover{background:var(--bg)}
.btn:disabled{opacity:.5;cursor:default}
#app{max-width:1500px;margin:0 auto;padding:28px 20px 60px}
h1{font-size:1.7rem;margin:0 0 6px}
h2{font-size:1.3rem;margin-top:0}
.mainnav{flex-wrap:wrap;row-gap:4px;gap:6px 18px}
.mainnav a{padding:6px 2px;border-bottom:3px solid transparent;white-space:nowrap}
.mainnav a.on{color:var(--accent,var(--green-d));font-weight:700;border-bottom-color:var(--accent,var(--green))}
.mainnav a small{margin-left:5px;font-size:.62rem;text-transform:uppercase;letter-spacing:.04em;background:var(--line);color:var(--muted);padding:1px 6px;border-radius:99px;vertical-align:middle}
.mainnav a.tlink{color:var(--green-d)}
.mainnav a.ext{color:var(--muted)}
.coursebar{background:#fff;border-bottom:3px solid var(--accent,var(--green))}
.cb-in{max-width:1500px;margin:0 auto;padding:0 20px;display:flex;align-items:center;gap:22px;flex-wrap:wrap}
.cb-title{font-weight:700;font-size:1.05rem;color:var(--accent);padding:10px 0}
.cb-in a{padding:12px 4px 9px;color:var(--ink);text-decoration:none;font-size:.92rem;border-bottom:3px solid transparent;margin-bottom:-3px}
.cb-in a.on{font-weight:700;border-bottom-color:var(--accent)}
.card.course{border-top:5px solid var(--accent,var(--green))}
.gtag{display:inline-block;margin:3px 4px 0 0;padding:1px 8px;border-radius:99px;background:var(--green-l);color:var(--green-d);font-size:.72rem;font-weight:600}
.chiplabel{font-size:.8rem;color:var(--muted);align-self:center;margin-right:2px;min-width:44px}
.rosteradd,.infobox{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 20px;margin-bottom:18px}
.infobox{background:#f2f8ff;border-color:#cfe0f5}
.infobox ul{margin:6px 0 0;padding-left:20px;font-size:.92rem}
.rosteradd h3{margin:0 0 8px}
.rosteradd label{display:grid;gap:4px;font-size:.9rem;font-weight:600;margin-bottom:10px}
.rosteradd label small{font-weight:400;color:var(--muted)}
.rosteradd textarea,.rosteradd input:not([type=checkbox]){padding:9px 12px;border:1px solid var(--line);border-radius:8px;font-size:.95rem;font-family:inherit}
.rosterrow{display:flex;gap:24px;flex-wrap:wrap;align-items:flex-end;margin-bottom:8px}
.rosterrow>label{flex:1;min-width:200px}
.rosterchk{display:flex;gap:14px;flex-wrap:wrap;align-items:center;padding-bottom:12px;font-size:.9rem}
.rosterchk>span{font-weight:600}
.rosteradd .chk{margin:0;font-weight:400}
.ramsg{font-size:.9rem;color:var(--green-d);margin-left:10px}
.rosteradd .sm{font-size:.82rem;color:var(--muted);margin:10px 0 0}
.tv.roster input.rn,.tv.roster input.rg{padding:6px 8px;border:1px solid var(--line);border-radius:6px;font-size:.9rem;min-width:140px}
.tv.roster td.c{text-align:center}
.tv .saved{color:var(--green-d);font-size:.8rem;display:inline-block;min-width:60px}
.tv.sched input[type=date]{padding:6px 8px;border:1px solid var(--line);border-radius:6px;font-size:.92rem}
.tv-tools select{padding:8px 10px;border:1px solid var(--line);border-radius:8px;font-size:.95rem}
.tryit,.codebox{background:#1e2430;border-radius:12px;padding:0 0 14px;margin:18px 0;overflow:hidden}
.codebox{margin-bottom:10px}
.codehead{display:flex;justify-content:space-between;align-items:center;padding:9px 16px;background:#161b24;color:#cfd6e4;font-size:.85rem}
.codetag{background:#00599c;color:#fff;border-radius:99px;padding:1px 10px;font-size:.72rem;font-weight:700}
textarea.code{display:block;width:100%;box-sizing:border-box;min-height:110px;resize:vertical;border:0;outline:0;background:#1e2430;color:#e6edf7;font:15px/1.55 Consolas,"Courier New",monospace;padding:14px 16px;tab-size:2;white-space:pre}
textarea.code:focus{background:#222a38}
.codebtns{display:flex;gap:10px;align-items:center;padding:6px 16px 10px;flex-wrap:wrap}
.codebtns .btn{padding:8px 16px}
.codebtns .btn.ghost{color:#fff;border-color:rgba(255,255,255,.65)}
.codebtns .btn.ghost:hover{background:#fff;color:var(--ink)}
.codebtns .btn.ghost:disabled{opacity:.6}
.codebtns .linkbtn{color:#9fb3d1}
.codebtns .badge{background:#d6f5e0}
.outhead{padding:0 16px;color:#9fb3d1;font-size:.8rem;text-transform:uppercase;letter-spacing:.05em}
pre.codeout{margin:6px 16px 0;background:#0f131a;color:#c9f5d4;border-radius:8px;padding:12px 14px;min-height:46px;white-space:pre-wrap;word-break:break-word;font:14px/1.5 Consolas,"Courier New",monospace}
pre.codeout.err{color:#ffb4ab}
.codebox #cfb{margin:10px 16px 0}
.codebox .result{margin:0}
.diff{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:10px;color:#cfd6e4;font-size:.85rem}
.diff pre.codeout{margin:4px 0 0}
@media(max-width:640px){.diff{grid-template-columns:1fr}}
details.hint,details.solution{margin:8px 0;padding:10px 14px;border:1px solid var(--line);border-radius:8px;background:var(--bg)}
details.solution pre.codeout{margin:8px 0 0}
details[hidden]{display:none}
@media(min-width:801px){.side{max-height:calc(100vh - 110px);overflow-y:auto}}
@media(max-width:800px){.layout{display:flex;flex-direction:column}.layout .main{order:-1;padding:18px}.side{position:static}}
.inhead{padding:6px 16px 4px;color:#9fb3d1;font-size:.8rem;text-transform:uppercase;letter-spacing:.05em;background:#161b24}
.inhead small{text-transform:none;letter-spacing:0;margin-left:6px;opacity:.8}
textarea.progin{display:block;width:100%;box-sizing:border-box;min-height:48px;resize:vertical;border:0;outline:0;background:#161b24;color:#ffe9a8;font:14px/1.5 Consolas,"Courier New",monospace;padding:6px 16px 10px;white-space:pre}
.steps .locked{display:flex;gap:10px;align-items:center;padding:9px 10px;border-radius:8px;color:#9aa5a0;font-size:.92rem;cursor:not-allowed}
.steps .locked .dot{background:none;border:0;font-size:.8rem}
.seqnote{font-size:.8rem;color:var(--muted);margin:10px 4px 0}
.content code{background:var(--bg)}
.printonly{display:none}
.tv.att th.d{text-align:center;min-width:54px}
.tv.att th.d small{font-weight:400}
.tv.att td.in{text-align:center;background:var(--green-l);color:var(--green-d);font-weight:600}
.tv.att td.in small{font-weight:400;color:var(--muted)}
.tv.att td.out{text-align:center;color:#c9a4a0;background:#fdf3f2}
.tv-tools input[type=date]{padding:7px 9px;border:1px solid var(--line);border-radius:8px;font-size:.92rem}
@media print{
  @page{size:A4 landscape;margin:12mm}
  body{background:#fff}
  .topbar,.coursebar,.pvbar,.noprint,.tv-tools,.chips,.btn,.back,.userbox,.sub.noprint{display:none!important}
  #app{max-width:none;padding:0}
  .printonly{display:block;margin:0 0 10px;color:#333;font-size:.95rem}
  .printonly.sign{margin-top:36px}
  h1{font-size:1.3rem;margin:0 0 4px}
  .tv-wrap{border:0;overflow:visible}
  .tv{font-size:.8rem}
  .tv th,.tv td{padding:4px 6px;border:1px solid #bbb;white-space:normal}
  .tv th{background:#eee!important;position:static}
  .tv .ghead td{background:#eee!important;color:#000}
  .tv .bar{display:none}
  .tv .detail{display:none}
  .tv.att td.out{background:#fff;color:#bbb}
  .tv.att td.in{background:#fff;color:#000}
  *{-webkit-print-color-adjust:exact;print-color-adjust:exact}
}
.hello{font-size:1.15rem;font-weight:600;margin:0 0 14px}
.hello .grp{font-size:.8rem;font-weight:600;background:var(--green-l);color:var(--green-d);padding:2px 10px;border-radius:99px;margin-left:8px}
.herogrid{display:grid;grid-template-columns:minmax(0,2fr) minmax(280px,1fr);gap:20px;align-items:start}
@media(max-width:900px){.herogrid{grid-template-columns:1fr}}
.herocard{display:grid;grid-template-columns:1fr 230px;background:var(--card);border:1px solid var(--line);border-radius:16px;overflow:hidden;min-height:250px}
@media(max-width:620px){.herocard{grid-template-columns:1fr}.heroart{display:none}}
.herotext{padding:26px 28px;display:flex;flex-direction:column;gap:6px}
.herokick{margin:0;font-size:.8rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);font-weight:700}
.herotext h2{margin:0;font-size:1.7rem}
.herotext h2 a{color:var(--ink);text-decoration:none}
.herotext h2 a:hover{text-decoration:underline}
.heroprog{display:flex;align-items:center;gap:12px;margin:6px 0 10px;font-size:.85rem;color:var(--muted)}
.heroprog .bar{flex:1;max-width:260px}
.heroprog .bar i{background:var(--accent)}
.heronext{margin:0;font-size:1.05rem}
.herometa{margin:0 0 14px;color:var(--muted);font-size:.9rem}
.herotext .btn{align-self:flex-start;background:var(--accent)}
.heroart{background:linear-gradient(135deg,var(--accent),#1f2a24);display:grid;place-items:center}
.heroart span{font-size:4.2rem;font-weight:800;color:#fff;opacity:.92;letter-spacing:-2px}
.sidecards{display:grid;gap:14px}
.scard{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px 18px}
.scard h4{margin:0 0 8px;font-size:1rem}
.scard .sm{margin:6px 0;font-size:.85rem;color:var(--muted)}
.goal{margin:0;display:flex;align-items:center;gap:10px;font-size:.95rem}
.star{display:inline-grid;place-items:center;width:32px;height:32px;border-radius:50%;background:var(--bg);color:#bbb;font-size:1.1rem;flex:none}
.star.on{background:#fff3c4;color:#f9ab00}
.wk{display:flex;gap:6px;margin:8px 0}
.wk span{flex:1;height:34px;border:1px solid var(--line);border-radius:8px;display:grid;place-items:center;font-size:.78rem;color:var(--muted)}
.wk span.on{background:var(--green-l);border-color:var(--green);color:var(--green-d);font-weight:700}
.wk span.today{outline:2px solid var(--green);outline-offset:1px}
.upcoming{list-style:none;margin:0;padding:0;font-size:.88rem}
.upcoming li{padding:5px 0;border-bottom:1px solid var(--line)}
.upcoming li:last-child{border:0}
.sect{margin:34px 0 14px;font-size:1.25rem}
.lockmsg{background:#fff3c4;border-radius:8px;padding:6px 10px;font-size:.85rem;font-weight:600;color:#7a5b00}
.lockmsg.soft{background:var(--bg);color:var(--muted);font-weight:500}
.card.locked{background:var(--bg)}
.cardbtns{display:flex;gap:10px}
.cardbtns .btn{flex:1;text-align:center}
.morecourses{margin:22px 0 0}
.mainnav a.browse{color:var(--green-d)}
.card.soon{opacity:.8}
.badge.soonb{background:var(--line);color:var(--muted)}
.soonbox{background:var(--card);border:1px dashed var(--line);border-radius:12px;padding:28px;max-width:560px}
.soonbox p{color:var(--muted)}
.coursetag{color:var(--muted);font-weight:500;font-size:.7em}
@media(max-width:700px){.topbar{flex-wrap:wrap}.mainnav{order:3;width:100%;margin:0;overflow-x:auto;flex-wrap:nowrap}}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.chip{border:1px solid var(--line);background:var(--card);border-radius:99px;padding:6px 14px;font-size:.88rem;cursor:pointer;color:var(--ink)}
.chip:hover{background:var(--green-l)}
.chip.on{background:var(--green);border-color:var(--green);color:#fff;font-weight:600}
.chk{display:flex;align-items:center;gap:6px;font-size:.92rem;color:var(--muted)}
.tv .ghead td{background:var(--green-l);color:var(--green-d);position:sticky;left:0}
.tv-tools{align-items:center}
.or{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:.85rem;margin:18px 0 12px}
.or::before,.or::after{content:"";flex:1;height:1px;background:var(--line)}
.tabs{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden;margin-bottom:14px}
.tabs button{flex:1;border:0;background:var(--bg);padding:9px;cursor:pointer;font-size:.92rem;color:var(--muted)}
.tabs button.on{background:var(--green-l);color:var(--green-d);font-weight:700}
.authform{display:grid;gap:12px;text-align:left}
.authform label{display:grid;gap:4px;font-size:.88rem;color:var(--muted)}
.authform input{padding:10px 12px;border:1px solid var(--line);border-radius:8px;font-size:1rem;color:var(--ink)}
.authform input:focus{outline:2px solid var(--green);border-color:var(--green)}
.autherr{color:var(--red);font-size:.88rem;min-height:1.2em;margin:0}
.linkbtn{background:none;border:0;color:var(--green-d);cursor:pointer;text-decoration:underline;font-size:.88rem;padding:0}
.notice{background:#fff8e1;border:1px solid #f3d98b;border-radius:10px;padding:10px 16px;margin-bottom:16px;font-size:.92rem}
.login{max-width:440px}
.tv-tools{display:flex;gap:12px;margin-bottom:14px;flex-wrap:wrap}
.tv-tools input{flex:1;min-width:220px;padding:10px 14px;border:1px solid var(--line);border-radius:8px;font-size:.95rem}
.tv-tools input[type=checkbox]{flex:none;min-width:0;width:auto;margin:0}
.tv-wrap{overflow-x:auto;background:var(--card);border:1px solid var(--line);border-radius:12px}
.tv{border-collapse:collapse;width:100%;font-size:.92rem}
.tv th,.tv td{padding:10px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;white-space:nowrap}
.tv th{background:var(--bg);position:sticky;top:0}
.tv th.sortable{cursor:pointer;user-select:none}
.tv small{display:block;color:var(--muted);font-size:.78rem;font-weight:400}
.tv .srow{cursor:pointer}
.tv .srow:hover{background:var(--green-l)}
.tv .bar{height:6px;margin-top:4px;min-width:70px}
.tv .detail td{background:var(--bg);white-space:normal}
.tv-mod{display:inline-block;vertical-align:top;margin:6px 24px 10px 0;min-width:260px}
.tv-mod ul{list-style:none;margin:6px 0 0;padding:0}
.tv-mod li{color:var(--muted);padding:1px 0}
.tv-mod li.ok{color:var(--ink)}
.tv-mod li.ok::first-letter{color:var(--green-d)}
.brand{white-space:nowrap}
.brand a{color:var(--ink);text-decoration:none}
.brand a.brandsub{color:var(--green);font-weight:600;margin-left:4px}
.brand a:hover{text-decoration:underline}
.pvbar{background:#fff3c4;border-bottom:2px solid #f9ab00;padding:8px 20px;font-size:.92rem;display:flex;gap:14px;align-items:center;flex-wrap:wrap;justify-content:center}
.pvbar b{color:#7a5b00}
.pct{color:var(--green-d);font-size:1.25rem}
.sub{color:var(--muted);margin:0 0 24px}
.login{max-width:420px;margin:80px auto;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:36px;text-align:center}
.login p{color:var(--muted)}
.note{font-size:.82rem;color:var(--muted);margin-top:16px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px;display:flex;flex-direction:column;gap:10px}
.card h3{margin:0}
.card p{margin:0;color:var(--muted);font-size:.93rem;flex:1}
.bar{height:8px;background:var(--line);border-radius:99px;overflow:hidden}
.bar>i{display:block;height:100%;background:var(--green);border-radius:99px;transition:width .3s}
.meta{display:flex;justify-content:space-between;font-size:.82rem;color:var(--muted)}
.layout{display:grid;grid-template-columns:290px 1fr;gap:24px;align-items:start}
@media(max-width:800px){.layout{grid-template-columns:1fr}}
.side{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px;position:sticky;top:76px}
.side h3{margin:0 0 4px;font-size:1rem}
.side .bar{margin:8px 0 12px}
.steps{list-style:none;padding:0;margin:0}
.steps a{display:flex;gap:10px;align-items:center;padding:9px 10px;border-radius:8px;color:var(--ink);text-decoration:none;font-size:.92rem}
.steps a:hover{background:var(--bg)}
.steps a.cur{background:var(--green-l);font-weight:600}
.dot{flex:none;width:20px;height:20px;border-radius:50%;border:2px solid var(--line);display:grid;place-items:center;font-size:.7rem;color:#fff}
.dot.done{background:var(--green);border-color:var(--green)}
.tag{margin-left:auto;font-size:.68rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted)}
.main{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:28px}
.content img{max-width:100%;height:auto;display:block}
.content figure{margin:18px 0;padding:0}
.content figure img{border:1px solid var(--line);border-radius:10px}
.content figcaption{font-size:.85rem;color:var(--muted);margin-top:6px;text-align:center}
.content table{border-collapse:collapse;margin:14px 0}
.content td,.content th{border:1px solid var(--line);padding:6px 12px}
.content th{background:var(--green-l)}
.content blockquote{margin:16px 0;padding:12px 16px;background:var(--green-l);border-left:4px solid var(--green);border-radius:6px}
.content details{margin:10px 0;padding:10px 14px;border:1px solid var(--line);border-radius:8px}
.content summary{cursor:pointer;font-weight:600;color:var(--green-d)}
.content h3{margin-top:26px}
.content table{display:block;overflow-x:auto}
.dl{background:#fff8e1;border:1px solid #f3d98b;border-radius:10px;padding:12px 16px;margin-bottom:18px}
.dl ul{list-style:none;margin:8px 0 0;padding:0}
.dl li{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:6px 0}
.dl li span{color:var(--muted);font-size:.88rem}
.tasks{display:grid;gap:8px;margin:10px 0}
.task{display:flex;gap:10px;align-items:flex-start;padding:10px 14px;border:1px solid var(--line);border-radius:8px;cursor:pointer;background:var(--bg)}
.task:has(input:checked){background:var(--green-l);border-color:var(--green)}
.task input{margin-top:5px;width:18px;height:18px;flex:none}
.drill{margin:14px 0}
.dq{font-size:1.2rem;margin:0 0 4px}
.dmsg{min-height:1.5em;color:var(--muted);margin:0 0 10px}
.dgrid{border-collapse:collapse;margin:0 0 14px;display:table!important}
.dgrid th,.dgrid td{border:1px solid var(--line);padding:10px 18px;min-width:90px;text-align:center}
.dgrid th{background:var(--bg);color:var(--muted)}
.dgrid td{cursor:pointer;user-select:none}
.dgrid td:hover{background:var(--green-l)}
.dgrid td.ok{background:var(--green);color:#fff}
.dgrid td.bad{background:var(--red);color:#fff}
.words td:nth-child(2){font-size:1.05rem}
.content h3 small{font-weight:400;color:var(--muted);font-size:.85em}
.content pre.csv{background:#1f2a24;color:#e6f4ea;padding:12px 16px;border-radius:8px;overflow-x:auto;font-size:.95rem}
.content code{background:var(--bg);padding:2px 6px;border-radius:4px;font-size:.92em}
.video{position:relative;padding-top:56.25%;background:#111;border-radius:10px;overflow:hidden;margin-bottom:16px}
.video iframe,.video div{position:absolute;inset:0;width:100%;height:100%;border:0}
.video div{display:grid;place-items:center;color:#aaa;text-align:center;padding:20px}
.q{border:1px solid var(--line);border-radius:10px;padding:16px;margin-bottom:14px}
.q.ok{border-color:var(--green);background:var(--green-l)}
.q.bad{border-color:var(--red);background:var(--red-l)}
.q p{margin:0 0 8px;font-weight:600}
.q label{display:block;padding:5px 0;cursor:pointer}
.q .why{font-size:.88rem;color:var(--muted);margin-top:8px}
.result{padding:14px 16px;border-radius:10px;margin:16px 0;font-weight:600}
.result.pass{background:var(--green-l);color:var(--green-d)}
.result.fail{background:var(--red-l);color:var(--red)}
.nav{display:flex;justify-content:space-between;margin-top:26px;gap:10px;flex-wrap:wrap}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.badge{display:inline-block;background:var(--green-l);color:var(--green-d);border-radius:99px;padding:2px 10px;font-size:.78rem;font-weight:600}
.back{display:inline-block;margin-bottom:14px;color:var(--muted);text-decoration:none;font-size:.9rem}

/* HTML live preview */
.previewbox{margin:8px 16px 0}
.prevhead{color:#9fb3d1;font-size:.8rem;text-transform:uppercase;letter-spacing:.05em;margin-bottom:6px}
.prevhost{background:#fff;border-radius:8px;min-height:120px;overflow:hidden}
.prevempty{margin:0;padding:18px 14px;color:#6b7280;font-size:.9rem}
iframe.preview{display:block;width:100%;height:300px;border:0;background:#fff}
.fakebar{background:#dfe3ea;padding:6px 10px 0;display:flex}
.faketab{background:#fff;border-radius:8px 8px 0 0;padding:6px 14px;font-size:.8rem;color:#1f2933;max-width:70%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;border:1px solid #c9ced8;border-bottom:0}
.faketab::before{content:"\1F5CE  ";color:#6b7280}
.faketab i{color:#6b7280}

/* Colour lab */
.clab{background:#1e2430;border-radius:12px;padding:0 0 14px;margin:18px 0;overflow:hidden;color:#e7ecf4}
.clabhead{display:flex;justify-content:space-between;align-items:center;padding:10px 16px;color:#e7ecf4}
.clabbody{padding:0 16px}
.clabsw{height:96px;border-radius:10px;border:2px solid rgba(255,255,255,.25)}
.clabsl{margin-top:12px;display:grid;gap:10px}
.clabrow{display:grid;grid-template-columns:92px 1fr 54px;align-items:center;gap:10px;font-size:.9rem}
.clabrow input[type=range]{-webkit-appearance:none;appearance:none;height:14px;border-radius:7px;border:1px solid rgba(255,255,255,.3);width:100%}
.clabrow input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:22px;height:22px;border-radius:50%;background:#fff;border:2px solid #333;cursor:pointer}
.clabrow input[type=range]::-moz-range-thumb{width:20px;height:20px;border-radius:50%;background:#fff;border:2px solid #333;cursor:pointer}
.clabrow output{text-align:right;font-variant-numeric:tabular-nums}
.clabread{margin-top:10px;font:13px Consolas,"Courier New",monospace;color:#c9f5d4}
.mixlist{display:flex;flex-wrap:wrap;gap:6px;padding:0 16px 8px}
.mixchip{font-size:.78rem;padding:3px 10px;border-radius:12px;background:#2c3445;color:#aeb8cc}
.mixchip.ok{background:#1f7a4d;color:#fff}
.mixchip.now{background:#fff;color:#1e2430;font-weight:700}
.mixask{padding:0 16px;margin:4px 0 10px}
.mixhint{color:#aeb8cc;font-size:.88rem}
.clabbtns{display:flex;align-items:center;gap:12px;padding:12px 16px 0}
.mixbad{color:#ffb4ab}
@media(max-width:560px){.clabrow{grid-template-columns:74px 1fr 46px}}
.mixbase{display:flex;align-items:center;gap:10px;padding:0 16px 10px;font-size:.9rem;color:#c9d3e6}
.mixbasesw{width:54px;height:30px;border-radius:6px;border:2px solid rgba(255,255,255,.35);display:inline-block}

/* ---- GED section types ---- */
.opt{display:flex;align-items:flex-start;gap:10px;padding:8px 10px;border:1px solid var(--line);border-radius:8px;margin:6px 0;cursor:pointer;background:#fff}
.opt:hover{background:var(--bg)}
.opt input{margin-top:5px}
.opt .let{flex:none;width:1.6em;height:1.6em;border-radius:50%;background:var(--bg);display:grid;place-items:center;font-size:.8rem}
.opt.right{border-color:var(--green);background:var(--green-l)}
.opt.wrong{border-color:var(--red);background:var(--red-l)}
.q .qtext{margin-bottom:8px;line-height:1.5}
.q .why{font-size:.95rem;color:var(--ink);margin-top:10px;padding:10px 12px;background:rgba(255,255,255,.7);border-radius:8px}
.passlayout{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:start}
.passage{background:#fff;border:1px solid var(--line);border-radius:10px;padding:16px 18px;line-height:1.7;position:sticky;top:12px;max-height:calc(100vh - 24px);overflow-y:auto}
.passage h4{margin:0 0 8px}
@media(max-width:800px){.passlayout{grid-template-columns:1fr}.passage{position:static;max-height:none}}
.topicrep{width:100%;display:table!important}
.topicrep td,.topicrep th{text-align:left}
.topicrep .bar{min-width:120px}
.weak{color:var(--red)}
.examBar{position:sticky;top:0;z-index:5;display:flex;justify-content:space-between;background:#fff;border:1px solid var(--line);border-radius:10px;padding:10px 16px;margin-bottom:14px}
.examBar.low b,.examBar .low b{color:var(--red)}
.examintro{background:var(--green-l);border-radius:10px;padding:4px 16px}
.essaybox{width:100%;box-sizing:border-box;font:inherit;line-height:1.6;padding:12px;border:1px solid var(--line);border-radius:10px;resize:vertical}
.calcbtn{position:fixed;right:16px;bottom:16px;z-index:20;box-shadow:0 2px 8px rgba(0,0,0,.25)}
.calc{position:fixed;right:16px;bottom:70px;z-index:21;width:260px;background:#1e2430;color:#fff;border-radius:14px;padding:12px;box-shadow:0 6px 24px rgba(0,0,0,.35)}
.calc.hidden{display:none}
.calchead{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.calcx{background:none;border:0;color:#fff;font-size:1.4rem;cursor:pointer}
.calcscreen{background:#e6f4ea;color:#1f2a24;border-radius:8px;padding:8px 10px;text-align:right;margin-bottom:10px;min-height:3.2em}
.calcexp{font-size:.9rem;min-height:1.3em;word-break:break-all;color:#4a5a50}
.calcres{font-size:1.5rem;font-weight:700}
.calckeys{display:grid;grid-template-columns:repeat(5,1fr);gap:6px}
.calckeys button{padding:10px 0;border:0;border-radius:8px;background:#3a4252;color:#fff;font-size:1rem;cursor:pointer}
.calckeys button.num{background:#4b556a}
.calckeys button.eq{background:var(--green)}
.mathfig{margin:14px 0;text-align:center}
.mathfig svg{max-width:100%;height:auto;background:#fff;border:1px solid var(--line);border-radius:10px}
.q label.opt{display:flex;padding:8px 10px;align-items:center}
.opt>span{min-width:0}

/* Pictures: never taller than about half the screen, so a learner can see the picture and the text together */
.content img,.content figure img{max-width:100%;max-height:min(50vh,380px);width:auto;height:auto;object-fit:contain;margin-left:auto;margin-right:auto}
.mathfig svg{display:block;margin:0 auto;width:100%;max-width:520px;max-height:min(50vh,380px)}
.mathfig.graph svg{max-width:360px}
.content figure{text-align:center}

/* Myanmar text: hidden until the learner switches it on */
.my{display:none;font-family:"Noto Sans Myanmar","Myanmar Text","Padauk",sans-serif;line-height:1.9;margin:8px 0 14px;padding:8px 12px;border-left:4px solid #c2410c;background:#fff7ed;border-radius:6px;font-size:.98rem}
body.lang-my .my{display:block}
.my p,.my ul{margin:.3em 0}
.langbar{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:14px;font-size:.85rem;color:var(--muted)}
.langbar button{border:1px solid var(--line);background:#fff;border-radius:99px;padding:6px 14px;cursor:pointer;font-family:inherit;font-size:.9rem}
.langbar button.on{background:var(--green);color:#fff;border-color:var(--green)}
.calckeys .wide2{grid-column:span 2}
.calckeys .wide3{grid-column:span 3}
.calcres{font-size:1.3rem;word-break:break-all}
.langbar button{font-family:"Noto Sans Myanmar","Myanmar Text",inherit,sans-serif;line-height:1.8}
.mini{background:#f6f8f7;border:1px solid var(--line);border-radius:8px;padding:10px 14px;margin:8px 0 12px;line-height:1.6}