:root{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#23372f;background:#f5f5ef;font-synthesis:none;
  --green:#243d35;--muted:#6a746c;--line:#dce1d8;--ok:#e3f2e4;--ok-ink:#256343;--wrong:#fbe5e1;--wrong-ink:#8b403b;--wait:#fff3de;--wait-ink:#915c20;--tech:#e8e9f6;--tech-ink:#454a82}
*{box-sizing:border-box}
body{margin:0}
.site-header,main,footer{max-width:1180px;margin:auto;padding:22px 28px}
main:has(#standings-card){max-width:none}
.site-header{display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;border-bottom:1px solid var(--line)}
footer{border-top:1px solid var(--line);margin-top:30px}
.brand{display:flex;align-items:center;gap:15px}
.logo{display:grid;place-items:center;width:52px;height:58px;background:var(--green);color:#f8f8ee;border-radius:12px;font:30px Georgia,serif}
.eyebrow{font-size:11px;letter-spacing:1.5px;color:var(--muted);font-weight:600}
h1{font:30px Georgia,serif;margin:5px 0}
h1 span{color:#768270;font-size:24px;margin-left:8px}
h2{font:26px Georgia,serif;margin:4px 0 14px}
h3{font-size:17px;margin:0 0 12px}
h4{font-size:15px;margin:18px 0 8px}
p{line-height:1.6}
button,.button-link{font:inherit;border:1px solid transparent;background:var(--green);color:#fff;border-radius:8px;padding:10px 16px;cursor:pointer;text-decoration:none;display:inline-block;line-height:1.3}
button:hover,.button-link:hover{filter:brightness(1.12)}
button:disabled{opacity:.45;cursor:wait}
.secondary{background:#edf0e8;color:#2b4338;border-color:#dce2d7}
.small{font-size:13px}
.muted{color:var(--muted);font-size:14px}
.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.between{justify-content:space-between}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px;margin:18px 0;box-shadow:0 3px 10px #22332205}
.hero{background:#e9eee2;border:1px solid #dce3d3;border-radius:14px;padding:24px;margin:8px 0 22px}
.hero h2{margin-bottom:6px}
.hero .eyebrow{margin-bottom:4px}
.meter{height:8px;background:#d7dfd0;border-radius:6px;overflow:hidden;margin-top:14px;max-width:420px}
.meter span{display:block;height:100%;background:var(--green)}
.tabs{display:flex;flex-wrap:wrap;gap:7px;margin:0 0 18px}
.tabs button.active{background:var(--green);color:#fff}
.level{margin:26px 0 10px;font:20px Georgia,serif;color:#3c5248}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px}
button.task{text-align:left;color:#23372f;background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px;min-height:104px;display:flex;flex-direction:column;justify-content:space-between;gap:12px}
button.task:hover{border-color:#b9c6b2;filter:none;box-shadow:0 4px 14px #22332210}
button.task b{font-weight:600}
.letter{font:22px Georgia,serif;color:#718164;margin-right:8px}
.badge{display:inline-block;border:1px solid #dce2d7;background:#f2f4ef;color:#4d5a50;border-radius:20px;padding:4px 10px;font-size:12px;white-space:nowrap;align-self:flex-start}
.badge.AC{color:var(--ok-ink);background:var(--ok);border-color:#c8e1ca}
.badge.WA,.badge.RE,.badge.TL,.badge.OL,.badge.STYLE{color:var(--wrong-ink);background:var(--wrong);border-color:#efc9c2}
.badge.QUEUED,.badge.RUNNING{color:var(--wait-ink);background:var(--wait);border-color:#ecd8b3}
.badge.IE{color:var(--tech-ink);background:var(--tech);border-color:#d2d4ee}
label{display:block;font-size:14px;margin:14px 0 6px;font-weight:500}
input,textarea,select{font:inherit;padding:11px;border:1px solid #cfd7cb;border-radius:8px;width:100%;max-width:100%;background:#fff;color:#23372f}
label input,label select,label textarea{display:block;margin-top:6px}
textarea{min-height:120px;resize:vertical}
#code{min-height:260px;font:14px/1.55 ui-monospace,SFMono-Regular,Menlo,monospace;tab-size:4}
input[type=file]{background:#f8faf5;font-size:14px}
small{display:block;color:var(--muted);line-height:1.5;margin-top:5px;font-weight:400}
pre{white-space:pre-wrap;overflow-wrap:anywhere;font:14px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace;background:#f4f6f1;border:1px solid #e3e8df;padding:12px 14px;border-radius:8px}
code{font:.93em ui-monospace,SFMono-Regular,Menlo,monospace;background:#f0f3ec;padding:1px 4px;border-radius:4px}
.statement{white-space:pre-wrap;line-height:1.7;font-size:16px;max-width:900px}
.examples{margin:22px 0}
.example-pair{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:10px}
.example-pair>div{min-width:0}
.example-pair pre{margin:6px 0;white-space:pre;overflow-x:auto;overflow-wrap:normal}
.attempt{border-top:1px solid var(--line);margin-top:16px;padding-top:12px}
.attempt h3{margin-bottom:6px}
#notice{background:#fff3de;border:1px solid #ecd8b3;padding:12px 14px;border-radius:8px}
#demo{background:#e9eee2;padding:12px 16px;border-radius:10px;margin-bottom:12px}
#demo label{display:flex;gap:10px;align-items:center;margin:0}
#demo select{width:auto}
.auth-card{max-width:520px;margin:30px auto}
.auth-nav{margin-top:22px;border-top:1px solid var(--line);padding-top:16px}
.auth-nav button{font-size:14px}
.who-card{background:#e9eee2;border-radius:8px;padding:12px 14px;margin:8px 0}
details summary{cursor:pointer;line-height:1.6;font-weight:500}
.theory-text{max-width:820px;line-height:1.65;margin-top:14px}
.theory-text h3{font:20px Georgia,serif;margin:26px 0 8px}
.theory-table{border-collapse:collapse;margin:10px 0}
.theory-table td,.theory-table th{border:1px solid var(--line);padding:6px 12px;text-align:left}
/* teacher standings */
.table-scroll{overflow-x:auto}
table{border-collapse:collapse;width:100%;font-size:14px}
td,th{text-align:center;border-bottom:1px solid #e5e9e1;padding:9px;white-space:nowrap}
td:first-child,th:first-child{text-align:left}
.standings-head{justify-content:space-between}
.standings-head h2{margin:0}
.standings-controls label{flex:1;min-width:160px}
.standings-scroll{max-height:65vh;border:1px solid var(--line);border-radius:8px}
.standings{font-variant-numeric:tabular-nums}
.standings th,.standings td{min-width:40px;padding:7px;border-right:1px solid #e5e9e1}
.standings thead th{position:sticky;top:0;z-index:2;background:#eef1ea}
.standings .student-name{position:sticky;left:0;z-index:1;background:#fff;min-width:190px;max-width:250px;white-space:normal;text-align:left}
.standings thead .student-name{z-index:3;background:#eef1ea}
.standings td button{background:none;color:inherit;border-radius:0;padding:5px;width:100%;min-width:25px;border:0}
.standings .student-name button{text-align:left;color:#2b5a44}
.standings td.ok{background:var(--ok);color:var(--ok-ink)}
.standings td.wrong{background:var(--wrong);color:var(--wrong-ink)}
.standings td.waiting{background:var(--wait);color:var(--wait-ink)}
.standings td.technical{background:var(--tech);color:var(--tech-ink)}
.standings td.empty{color:#a4ada2}
.standings tfoot{background:#f3f5f0;font-weight:600}
#standings-card:fullscreen,#standings-card.standings-full{margin:0;border-radius:0;overflow:auto;background:#fff}
#standings-card.standings-full{position:fixed;inset:0;z-index:100}
#standings-card:fullscreen .standings-scroll,#standings-card.standings-full .standings-scroll{max-height:calc(100vh - 230px)}
/* QR invitation cards */
.qr-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px;margin-top:16px}
.qr-card{border:1px dashed #b9c6b2;border-radius:12px;padding:16px;text-align:center;background:#fff;break-inside:avoid}
.qr-card svg{width:170px;height:170px;display:block;margin:8px auto}
.qr-card .name{font:19px Georgia,serif}
.qr-card .link{font:11px ui-monospace,monospace;color:var(--muted);overflow-wrap:anywhere}
@media(max-width:640px){.site-header,main,footer{padding:16px}.card{padding:16px}h1{font-size:24px}.example-pair{grid-template-columns:1fr;gap:6px}.grid{grid-template-columns:1fr}}
@media print{body{background:#fff}.site-header,footer,#notice,#demo,.no-print{display:none!important}#view>*:not(#invitations-card){display:none!important}#invitations-card{border:0;box-shadow:none;padding:0;margin:0}#invitations-card>*:not(.qr-cards){display:none!important}.qr-cards{grid-template-columns:repeat(3,1fr)}}
.meter span.w0{width:0%}.meter span.w5{width:5%}.meter span.w10{width:10%}.meter span.w15{width:15%}.meter span.w20{width:20%}.meter span.w25{width:25%}.meter span.w30{width:30%}.meter span.w35{width:35%}.meter span.w40{width:40%}.meter span.w45{width:45%}.meter span.w50{width:50%}.meter span.w55{width:55%}.meter span.w60{width:60%}.meter span.w65{width:65%}.meter span.w70{width:70%}.meter span.w75{width:75%}.meter span.w80{width:80%}.meter span.w85{width:85%}.meter span.w90{width:90%}.meter span.w95{width:95%}.meter span.w100{width:100%}
.pupil-statement{background:#f7f9f4;border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin:14px 0}.pupil-statement .statement{margin-top:10px;font-size:15px}.pupil-statement .examples{margin:12px 0 0}
.failure{border-left:3px solid #d9a79f;background:#fdf6f4;border-radius:0 8px 8px 0;padding:10px 14px;margin:10px 0}.failure-title{font-weight:600;color:var(--wrong-ink);margin-bottom:6px}.failure pre{background:#fff}