/* Get It? — app styles */
:root{
  --bg:#070b16;
  --bg2:#0b1122;
  --surface:#111a2e;
  --surface2:#16223c;
  --line:#25324e;
  --text:#eaf0ff;
  --muted:#94a3c4;
  --accent:#4f8cff;
  --accent2:#8b5cff;
  --green:#3ddc84;
  --amber:#ffc857;
  --red:#ff6b6b;
  --radius:18px;
}
*{box-sizing:border-box}
body{
  margin:0;
  background:
    radial-gradient(900px 520px at 50% -12%, rgba(79,140,255,.16), transparent 70%),
    var(--bg);
  color:var(--text);
  font-family:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  min-height:100vh;
}
.wrap{max-width:900px;margin:0 auto;padding:0 20px}
.hidden{display:none !important}
hr{border:none;border-top:1px solid var(--line);margin:26px 0}
a{color:var(--accent)}

/* ---------------------------------------------------------------- header */
header{
  position:sticky;top:0;z-index:50;
  background:rgba(7,11,22,.85);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.hrow{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;letter-spacing:-.02em}
.brand .mark{
  width:30px;height:30px;border-radius:9px;flex:0 0 30px;
  background:linear-gradient(135deg,var(--accent),var(--accent2));
  display:grid;place-items:center;font-size:16px;color:#fff;
  box-shadow:0 6px 20px rgba(79,140,255,.4);
}
.brand small{
  display:block;font-size:10px;font-weight:500;color:var(--muted);
  letter-spacing:.07em;text-transform:uppercase;margin-top:-3px;
}
nav{display:flex;gap:6px;background:var(--surface);padding:4px;border-radius:12px;border:1px solid var(--line)}
.tab{
  background:none;border:none;color:var(--muted);font:inherit;font-weight:600;font-size:14px;
  padding:7px 16px;border-radius:9px;cursor:pointer;transition:.18s;
}
.tab:hover{color:var(--text)}
.tab.active{background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;box-shadow:0 6px 18px rgba(79,140,255,.3)}

main{padding:32px 0 90px}

/* ----------------------------------------------------------------- cards */
.card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:26px;
  margin-bottom:20px;
}
.card.narrow{max-width:440px;margin-left:auto;margin-right:auto}
h1,h2,h3{letter-spacing:-.02em;margin:0 0 10px}
h2{font-size:24px}
h3{font-size:18px;margin-bottom:12px}
p{margin:0 0 12px}
.muted{color:var(--muted);font-size:14.5px}
.label,.srow .label{
  display:block;font-size:11.5px;font-weight:700;letter-spacing:.08em;
  text-transform:uppercase;color:var(--muted);margin:16px 0 7px;
}
.srow{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.srow h3{margin:0}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.row > input{flex:1;min-width:180px}
.btnrow{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}

/* --------------------------------------------------------------- inputs */
input{
  width:100%;
  background:var(--bg2);
  border:1px solid var(--line);
  border-radius:12px;
  padding:13px 15px;
  color:var(--text);
  font:inherit;
  font-size:15.5px;
  outline:none;
  transition:border-color .18s, box-shadow .18s;
}
input::placeholder{color:#5d6b8c}
input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(79,140,255,.18)}
input:disabled{opacity:.5}

/* -------------------------------------------------------------- buttons */
button{
  font:inherit;font-weight:600;font-size:15px;cursor:pointer;border-radius:12px;
  border:1px solid var(--line);background:var(--surface2);color:var(--text);
  padding:12px 20px;transition:transform .16s, box-shadow .16s, border-color .16s, filter .16s;
}
button:hover{transform:translateY(-1px);border-color:#33456b}
button:disabled{opacity:.45;cursor:not-allowed;transform:none}
.primary{
  background:linear-gradient(135deg,var(--accent),var(--accent2));
  border:none;color:#fff;
  box-shadow:0 8px 22px rgba(79,140,255,.32);
}
.primary:hover{filter:brightness(1.08)}
.ghost{background:transparent}
.wide{width:100%;margin-top:18px}
.small-btn{
  padding:7px 13px;font-size:13.5px;border-radius:9px;background:transparent;
  border:1px solid var(--line);color:var(--muted);
}
.small-btn:hover{color:var(--text);border-color:#3a4d75}

.msg{color:var(--red);font-size:14px;margin:12px 0 0;min-height:0}
.msg:empty{display:none}
.msg.ok{color:var(--green)}

/* --------------------------------------------------------------- codebox */
.codebox{
  display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;
  background:var(--bg2);border:1px solid var(--line);border-radius:14px;padding:16px 18px;
}
.join-code span{
  font-family:ui-monospace,"SF Mono",Consolas,monospace;
  font-size:34px;font-weight:800;letter-spacing:.16em;
  background:linear-gradient(135deg,var(--accent),var(--accent2));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.coderight{display:flex;gap:8px;flex-wrap:wrap}

/* ------------------------------------------------------------ class list */
.classrow,.checkrow{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:14px 16px;border:1px solid var(--line);border-radius:13px;
  background:var(--bg2);margin-bottom:9px;cursor:pointer;transition:.16s;
}
.classrow:hover,.checkrow:hover{border-color:var(--accent);transform:translateX(2px)}
.classrow.on{border-color:var(--accent);box-shadow:0 0 0 3px rgba(79,140,255,.14)}
.small{font-size:13.5px;color:var(--muted)}
.small b{color:var(--text);font-family:ui-monospace,Consolas,monospace;letter-spacing:.08em}

/* ------------------------------------------------------------- questions */
.qrow{display:flex;align-items:center;gap:11px;margin-bottom:9px}
.qnum{
  flex:0 0 28px;height:28px;border-radius:9px;display:grid;place-items:center;
  background:var(--surface2);border:1px solid var(--line);
  font-size:13px;font-weight:700;color:var(--muted);
}
.qinput{flex:1}

/* -------------------------------------------------------------- live bar */
.livebar{
  display:flex;align-items:center;gap:11px;flex-wrap:wrap;
  background:rgba(61,220,132,.09);border:1px solid rgba(61,220,132,.35);
  border-radius:13px;padding:13px 16px;margin-top:18px;font-size:14.5px;font-weight:600;
}
.livebar .dot{
  width:9px;height:9px;border-radius:50%;background:var(--green);
  box-shadow:0 0 0 0 rgba(61,220,132,.6);animation:pulse 2s infinite;
}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(61,220,132,.55)}
  70%{box-shadow:0 0 0 9px rgba(61,220,132,0)}
  100%{box-shadow:0 0 0 0 rgba(61,220,132,0)}
}
.livebar .small-btn{margin-left:auto}

/* --------------------------------------------------------------- results */
.stat-row{display:flex;gap:12px;margin:18px 0 4px;flex-wrap:wrap}
.stat{
  flex:1;min-width:110px;background:var(--bg2);border:1px solid var(--line);
  border-radius:14px;padding:16px;text-align:center;
}
.stat b{display:block;font-size:30px;line-height:1.1;font-weight:800}
.stat span{font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:600}
.stat.green{border-color:rgba(61,220,132,.4)}   .stat.green b{color:var(--green)}
.stat.amber{border-color:rgba(255,200,87,.4)}   .stat.amber b{color:var(--amber)}
.stat.red{border-color:rgba(255,107,107,.4)}    .stat.red b{color:var(--red)}

.summary{font-size:15px;color:var(--muted);margin:14px 0 6px}
.summary b{color:var(--text)}

.filters{display:flex;gap:7px;margin:16px 0 14px;flex-wrap:wrap}
.filters button{
  padding:7px 14px;font-size:13.5px;border-radius:999px;background:transparent;color:var(--muted);
}
.filters button.on{background:var(--surface2);color:var(--text);border-color:var(--accent)}

.sresult{
  border:1px solid var(--line);border-left:4px solid var(--line);
  border-radius:13px;padding:16px 18px;margin-bottom:11px;background:var(--bg2);
}
.sresult.lv-green{border-left-color:var(--green)}
.sresult.lv-amber{border-left-color:var(--amber)}
.sresult.lv-red{border-left-color:var(--red)}
.sresult .head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:6px}
.sresult .name{font-weight:700;font-size:16.5px}
.tag{
  font-size:11.5px;font-weight:700;text-transform:uppercase;letter-spacing:.07em;
  padding:4px 11px;border-radius:999px;border:1px solid;
}
.tag.lv-green{color:var(--green);border-color:rgba(61,220,132,.45);background:rgba(61,220,132,.1)}
.tag.lv-amber{color:var(--amber);border-color:rgba(255,200,87,.45);background:rgba(255,200,87,.1)}
.tag.lv-red{color:var(--red);border-color:rgba(255,107,107,.45);background:rgba(255,107,107,.1)}
.notes{color:var(--muted);font-size:14.5px;margin-bottom:10px}
.detail{display:flex;flex-direction:column;gap:6px;font-size:14.5px}
.detail .k{
  display:inline-block;min-width:52px;font-size:11px;font-weight:700;
  text-transform:uppercase;letter-spacing:.07em;color:var(--muted);
}
.nextstep{background:rgba(79,140,255,.09);border:1px solid rgba(79,140,255,.28);border-radius:10px;padding:9px 12px;margin-top:3px}
.warn{color:var(--amber);font-size:13.5px;font-weight:600}
.transcript{margin-top:12px}
.transcript summary{cursor:pointer;font-size:13.5px;color:var(--accent);font-weight:600}
.transcript pre{
  white-space:pre-wrap;word-wrap:break-word;font-size:13.5px;line-height:1.65;
  background:var(--bg);border:1px solid var(--line);border-radius:11px;
  padding:14px;margin:11px 0 0;color:var(--muted);font-family:inherit;
}

/* ---------------------------------------------------------------- chat */
.progress{
  font-size:12.5px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;
  color:var(--muted);background:var(--bg2);border:1px solid var(--line);
  padding:5px 12px;border-radius:999px;white-space:nowrap;
}
#chat{display:flex;flex-direction:column;gap:11px;margin:18px 0;min-height:80px}
.bubble{
  padding:13px 16px;border-radius:15px;max-width:86%;font-size:15.5px;
  white-space:pre-wrap;word-wrap:break-word;
}
.bubble.examiner{align-self:flex-start;background:var(--surface2);border:1px solid var(--line);border-bottom-left-radius:5px}
.bubble.student{align-self:flex-end;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;border-bottom-right-radius:5px}
.bubble.typing{color:var(--muted);font-style:italic;letter-spacing:.15em}
.row.stick{position:sticky;bottom:0}

.endline{
  align-self:center;text-align:center;font-size:14px;font-weight:600;color:var(--green);
  background:rgba(61,220,132,.09);border:1px solid rgba(61,220,132,.35);
  border-radius:999px;padding:10px 20px;margin-top:6px;
}

/* ---------------------------------------------------------- check cards */
.checkcard{
  border:1px solid var(--line);border-radius:14px;background:var(--bg2);
  padding:15px 17px;margin-bottom:10px;cursor:pointer;transition:.16s;
}
.checkcard:hover{border-color:#33456b}
.checkcard.on{border-color:var(--accent);box-shadow:0 0 0 3px rgba(79,140,255,.14)}
.checkcard.fresh{border-color:rgba(79,140,255,.5)}
.chead{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}
.ctitle{font-weight:700;font-size:16px;line-height:1.3}
.cmeta{font-size:12.5px;color:var(--muted);margin-top:3px}
.pill{
  display:inline-block;font-size:10.5px;font-weight:700;letter-spacing:.07em;text-transform:uppercase;
  color:var(--accent);border:1px solid rgba(79,140,255,.45);background:rgba(79,140,255,.12);
  padding:2px 9px;border-radius:999px;margin-right:7px;
}
.cbar{display:flex;height:7px;border-radius:999px;overflow:hidden;background:var(--surface2);margin:13px 0 9px}
.cbar i{display:block;height:100%}
.cbar i.g{background:var(--green)}
.cbar i.a{background:var(--amber)}
.cbar i.r{background:var(--red)}
.clegend{font-size:12.5px;color:var(--muted)}
.clegend b{color:var(--text)}
.cqlist{margin-top:14px;border-top:1px solid var(--line);padding-top:13px;cursor:default}
.cqlist ol{margin:0;padding-left:20px;font-size:14px;color:var(--muted);line-height:1.7}
.cqlist ol li{margin-bottom:5px}
.cqlist ol li::marker{color:var(--accent);font-weight:700}

/* --------------------------------------------------------------- toast */
#toast{
  position:fixed;left:50%;bottom:28px;transform:translate(-50%, 20px);
  background:var(--surface2);border:1px solid var(--line);color:var(--text);
  padding:11px 20px;border-radius:999px;font-size:14px;font-weight:600;
  opacity:0;pointer-events:none;transition:.22s;z-index:200;
  box-shadow:0 14px 40px rgba(0,0,0,.5);
}
#toast.on{opacity:1;transform:translate(-50%,0)}

/* ------------------------------------------------------------- tooltips */
[data-tip]{position:relative}
[data-tip]::after{
  content:attr(data-tip);
  position:absolute;left:50%;bottom:calc(100% + 9px);transform:translateX(-50%);
  background:#1b2740;color:var(--text);border:1px solid var(--line);
  padding:8px 12px;border-radius:10px;font-size:12.5px;font-weight:500;
  line-height:1.45;white-space:normal;width:max-content;max-width:250px;
  text-align:center;opacity:0;pointer-events:none;transition:opacity .16s;
  z-index:120;box-shadow:0 10px 30px rgba(0,0,0,.5);
}
[data-tip]:hover::after{opacity:1}
header [data-tip]::after{bottom:auto;top:calc(100% + 9px)}

/* ------------------------------------------------------------ responsive */
@media (max-width:640px){
  body{font-size:15.5px}
  .card{padding:20px}
  h2{font-size:21px}
  .join-code span{font-size:27px}
  .bubble{max-width:94%}
  .hrow{height:auto;padding:10px 0;flex-direction:column;align-items:stretch;gap:10px}
  nav{justify-content:center}
  .brand{justify-content:center}
  [data-tip]::after{display:none}
}

/* ---- class list (roster) */
textarea {
  width: 100%; box-sizing: border-box; background: var(--panel2, #141822);
  color: var(--text, #e8ecf4); border: 1px solid #2a3040; border-radius: 10px;
  padding: 10px; font: inherit; font-size: 14px; line-height: 1.5; resize: vertical; margin-top: 8px;
}
select {
  width: 100%; box-sizing: border-box; background: var(--panel2, #141822);
  color: var(--text, #e8ecf4); border: 1px solid #2a3040; border-radius: 10px;
  padding: 11px; font: inherit; font-size: 15px; margin-top: 6px;
}
.roster { margin: 12px 0 4px; }
.prow { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 7px 0; border-top: 1px solid #1e2430; }
.prow:first-child { border-top: 0; }
.pname { font-size: 14px; font-weight: 600; }
.pdots { display: flex; gap: 4px; align-items: center; }
.dot2 { width: 11px; height: 11px; border-radius: 50%; display: inline-block; }
.dot2.lv-green { background: #22c55e; }
.dot2.lv-amber { background: #f59e0b; }
.dot2.lv-red { background: #ef4444; }