:root{
  --bg:#f4efe6; --paper:#fffaf2; --ink:#1d2a24; --muted:#6b7570; --line:#e3dacb;
  --green:#1f6f50; --green-2:#2f8f68; --amber:#e8a33d; --red:#c8553d; --blue:#2c5d8a;
  --r:16px; --shadow:0 1px 0 rgba(0,0,0,.04),0 8px 24px -12px rgba(40,30,10,.25);
  --mono:ui-monospace,"SF Mono",Menlo,monospace;
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--ink);font-family:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;-webkit-text-size-adjust:100%}
button,input,textarea,select{font:inherit;color:inherit}
a{color:var(--green)}
.wrap{max-width:1280px;margin:0 auto;padding:20px clamp(12px,3vw,32px) 48px}
.top{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:18px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;letter-spacing:-.2px}
.brand i{width:34px;height:34px;border-radius:10px;background:var(--green);display:grid;place-items:center;color:#fff;font-style:normal;font-size:18px}
.spacer{flex:1}
.conn{display:inline-flex;align-items:center;gap:8px;font-size:13px;padding:6px 12px;border-radius:999px;background:var(--paper);border:1px solid var(--line)}
.conn::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--amber)}
.conn.ok::before{background:#2fb26b}
.conn.bad::before{background:var(--red);animation:blink 1s infinite}
@keyframes blink{50%{opacity:.3}}
.card{background:var(--paper);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);padding:18px}
.eyebrow{font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
h1{font-size:clamp(26px,4vw,40px);letter-spacing:-.6px;margin:.2em 0 .3em;line-height:1.1}
h2{font-size:18px;margin:2px 0 12px;display:flex;align-items:center;gap:8px}
h2 .num{font-family:var(--mono);font-size:11px;color:var(--muted);font-weight:500}
.muted{color:var(--muted)}
.btn{border:1px solid var(--line);background:#fff;border-radius:12px;padding:10px 16px;font-weight:600;cursor:pointer;transition:transform .08s,background .15s}
.btn:active{transform:scale(.97)}
.btn.primary{background:var(--green);border-color:var(--green);color:#fff}
.btn.primary:hover{background:var(--green-2)}
.btn.warn{background:var(--amber);border-color:var(--amber);color:#2b1d05}
.btn.danger{color:var(--red);border-color:#efc9bf}
.btn.sm{padding:6px 10px;font-size:13px;border-radius:9px}
.btn:disabled{opacity:.45;cursor:not-allowed}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:12px}
.field label{font-size:13px;font-weight:600}
.input,textarea,select{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:#fff;font-size:16px}
textarea{min-height:110px;resize:vertical}
.grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr))}
.badge{display:inline-block;font-size:12px;font-weight:600;padding:3px 9px;border-radius:999px;background:#eef3ef;color:var(--green)}
.badge.warn{background:#fbefd9;color:#8a5a10}
.badge.red{background:#f8e1db;color:var(--red)}
.hidden{display:none!important}
.block{max-width:520px;margin:12vh auto;text-align:center}
.block .icon{font-size:44px}

/* teacher */
.t-head{display:grid;gap:16px;grid-template-columns:minmax(0,1fr) auto;align-items:stretch;margin-bottom:16px}
@media (max-width:760px){.t-head{grid-template-columns:1fr}}
.code{font-family:var(--mono);font-size:clamp(34px,6vw,58px);font-weight:700;letter-spacing:.12em}
.qrbox{display:flex;gap:16px;align-items:center;flex-wrap:wrap}
.qrbox canvas,.qrbox img{width:240px;height:240px;background:#fff;border-radius:12px;padding:8px;border:1px solid var(--line)}
.timer-big{font-family:var(--mono);font-size:clamp(48px,8vw,84px);font-weight:700;text-align:center;letter-spacing:.02em;line-height:1;margin:6px 0 14px}
.timer-big.fin{color:var(--red);animation:blink 1s infinite}
.timer-big.small{font-size:42px;margin:0}
.teams{display:grid;gap:10px}
.team{display:flex;align-items:center;gap:10px;padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:#fff;cursor:pointer;user-select:none}
.team:hover{border-color:var(--green-2)}
.team .name{flex:1;font-weight:600}
.team .score{font-family:var(--mono);font-size:26px;font-weight:700;min-width:44px;text-align:right}
.team.lead .score{color:var(--green)}
.wheel-wrap{position:relative;width:min(100%,260px);aspect-ratio:1;margin:0 auto 12px}
.wheel-wrap canvas{width:100%;height:100%}
.wheel-wrap .pin{position:absolute;top:-6px;left:50%;transform:translateX(-50%);width:0;height:0;border-left:12px solid transparent;border-right:12px solid transparent;border-top:22px solid var(--ink)}
.result{text-align:center;font-size:20px;font-weight:700;min-height:30px}
.winner{border-radius:14px;padding:16px;text-align:center;background:#eef3ef;border:2px dashed #b9d4c4;min-height:96px;display:flex;flex-direction:column;justify-content:center}
.winner.on{background:var(--green);color:#fff;border:2px solid var(--green);animation:pop .35s ease}
@keyframes pop{0%{transform:scale(.94)}60%{transform:scale(1.03)}100%{transform:scale(1)}}
.winner .wname{font-size:26px;font-weight:800}
.queue{list-style:none;padding:0;margin:10px 0 0;display:grid;gap:6px;max-height:220px;overflow:auto}
.queue li{display:flex;gap:10px;align-items:center;padding:7px 10px;border-radius:10px;background:#fff;border:1px solid var(--line);font-size:14px}
.queue li b{font-family:var(--mono);width:26px}
.queue li.win{border-color:var(--green);background:#eef7f1}
.queue li .ms{margin-left:auto;font-family:var(--mono);font-size:12px;color:var(--muted)}
.players{font-size:13px;color:var(--muted);max-height:120px;overflow:auto}
.links{display:grid;gap:8px;font-size:13px}
.links code{word-break:break-all;background:#fff;border:1px solid var(--line);padding:6px 8px;border-radius:8px;display:block}

/* student */
.s-wrap{max-width:520px;margin:0 auto;padding:16px 16px 40px}
.buzz{width:100%;aspect-ratio:1;max-height:62vh;border-radius:50%;border:0;font-size:clamp(24px,7vw,34px);font-weight:800;color:#fff;background:#b9c2bd;box-shadow:inset 0 -10px 0 rgba(0,0,0,.15);cursor:pointer;touch-action:manipulation;-webkit-tap-highlight-color:transparent;transition:background .2s,transform .06s}
.buzz.ready{background:radial-gradient(circle at 35% 30%,#ff8a6b,var(--red));box-shadow:inset 0 -12px 0 rgba(0,0,0,.18),0 0 0 10px rgba(200,85,61,.18);animation:pulse 1.2s infinite}
.buzz.ready:active{transform:scale(.97)}
.buzz.done{background:var(--blue)}
.buzz.win{background:var(--green)}
@keyframes pulse{50%{box-shadow:inset 0 -12px 0 rgba(0,0,0,.18),0 0 0 22px rgba(200,85,61,.06)}}
.status{text-align:center;font-size:18px;font-weight:700;margin:14px 0 4px}
.sub{text-align:center;color:var(--muted);font-size:14px;min-height:20px}
.mini{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:16px}
.mini .card{padding:12px}
.s-score{display:flex;justify-content:space-between;font-size:14px;padding:3px 0}
.s-score.mine{font-weight:700;color:var(--green)}
.toast{position:fixed;left:50%;bottom:18px;transform:translateX(-50%);background:var(--ink);color:#fff;padding:10px 16px;border-radius:12px;font-size:14px;z-index:9;max-width:90vw}
@media print{body *{visibility:hidden}#printArea,#printArea *{visibility:visible}#printArea{position:fixed;inset:0;display:flex!important;flex-direction:column;align-items:center;justify-content:center;gap:16px}}

.qrshow{position:fixed;inset:0;z-index:50;background:var(--paper);display:flex;align-items:center;justify-content:center;padding:3vh 3vw}
.qs-in{display:flex;flex-direction:column;align-items:center;gap:1.4vh;text-align:center;width:100%}
.qs-t{font-size:clamp(24px,4.5vh,48px);font-weight:800}
#qsQr svg{width:min(62vh,82vw);height:min(62vh,82vw);background:#fff;border-radius:16px;display:block}
.qs-code{font-family:var(--mono);font-size:clamp(36px,8vh,88px);font-weight:800;letter-spacing:.18em;line-height:1}
.qs-url{font-size:clamp(16px,2.6vh,28px);color:var(--muted)}
.qs-on{font-weight:700;color:var(--green)}