:root{
  --bg:#0b1020;
  --text:#eef2ff;
  --muted:#b7c0ff;
  --stroke:rgba(255,255,255,.12);
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --radius: 18px;

  --brand-1:#3fa9f5;
  --brand-2:#7ac943;
  --brand-3:#fe921d;
  --brand-4:#ff1d25;
  --brand-5:#fe7aab;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: radial-gradient(1200px 700px at 15% 10%, rgba(63,169,245,.20), transparent 55%),
              radial-gradient(1200px 700px at 92% 22%, rgba(254,146,29,.14), transparent 55%),
              var(--bg);
  color:var(--text);
}

.topbar{
  display:flex;
  gap:14px;
  align-items:flex-start;
  padding:18px 18px 0;
  max-width:1200px;
  margin:0 auto;
}
.back{
  color:var(--text);
  text-decoration:none;
  border:1px solid var(--stroke);
  border-radius:999px;
  padding:10px 12px;
  background: rgba(0,0,0,.18);
}
.title h1{margin:0; font-size:24px}
.title p{margin:4px 0 0; color:var(--muted)}

.layout{
  max-width:1200px;
  margin:16px auto 220px;
  padding:0 18px;
  display:grid;
  grid-template-columns: 410px 1fr;
  gap:16px;
}

.panel{
  background: rgba(0,0,0,.18);
  border:1px solid var(--stroke);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding:14px;
  backdrop-filter: blur(10px);
  height: fit-content;
}

.hud{
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap:10px;
  margin-bottom: 12px;
}
.stat{
  border:1px solid var(--stroke);
  border-radius: 14px;
  padding:10px;
  background: rgba(255,255,255,.04);
}
.stat.wide{grid-column: 1 / -1;}
.label{
  display:block;
  font-size:12px;
  color:var(--muted);
  margin-bottom:6px;
}
.stat span:last-child{
  font-size:18px;
  font-weight:900;
}

.settings{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap:10px;
  margin-bottom: 12px;
}
label{
  display:flex;
  flex-direction:column;
  gap:6px;
  font-size:13px;
  color: var(--muted);
}

select, input[type="range"]{
  border-radius: 12px;
  border:1px solid var(--stroke);
  background: rgba(0,0,0,.22);
  color: var(--text);
  padding:10px;
  font-size:16px;
}

.check{ grid-column: 1 / -1; }
.checkRow{
  display:flex;
  align-items:center;
  gap:10px;
  padding:10px;
  border-radius: 12px;
  border:1px solid var(--stroke);
  background: rgba(0,0,0,.22);
  color: var(--text);
  font-size:16px;
}
.checkRow input{
  width: 22px;
  height: 22px;
  accent-color: var(--brand-1);
}

.nextRow{
  grid-column: 1 / -1;
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap:10px;
  align-items: stretch;
}

.nextNote{
  border:1px solid rgba(255,255,255,.18);
  border-radius: 14px;
  padding:10px;
  background: rgba(0,0,0,.22);
  display:flex;
  flex-direction:column;
  justify-content:center;
  min-height: 92px;
}
.nextNoteLabel{
  font-size:12px;
  color: rgba(255,255,255,.92);
  opacity: .9;
  margin-bottom: 6px;
  font-weight: 800;
}
.nextNoteName{
  font-size: 40px;
  font-weight: 1000;
  letter-spacing: .5px;
  color: white;
}

.controlsBox{
  display:grid;
  grid-template-columns: 1fr;
  gap:10px;
}

.primary,.secondary{
  border-radius: 14px;
  border:1px solid var(--stroke);
  padding:12px 12px;
  font-size:16px;
  font-weight:900;
  color: var(--text);
  background: rgba(255,255,255,.06);
  box-shadow: 0 10px 22px rgba(0,0,0,.35);
}
.primary:active,.secondary:active{transform: scale(.99)}

.teacher{
  border-top: 1px solid var(--stroke);
  padding-top: 10px;
  margin-top: 6px;
}
.teacher summary{
  cursor:pointer;
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:10px;
  color: rgba(255,255,255,.92);
  font-weight:900;
  user-select:none;
}
.teacher summary small{
  color: var(--muted);
  font-weight:700;
}
.teacherGrid{
  margin-top: 12px;
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap:10px;
}
.teacherGrid label{grid-column:auto;}
.teacherGrid .check{grid-column: 1 / -1;}

.rangeReadout{
  margin-top: -2px;
  font-size: 13px;
  color: rgba(255,255,255,.85);
  font-weight: 800;
}

.teacherButtons{
  grid-column: 1 / -1;
  display:grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap:10px;
}

.hint{
  border-top: 1px solid var(--stroke);
  padding-top: 10px;
  color: var(--muted);
  line-height: 1.35;
}

.stage{
  position: relative;
  background: rgba(0,0,0,.18);
  border:1px solid var(--stroke);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  padding: 14px;
  display:flex;
  align-items:center;
  justify-content:center;
  min-height: 520px;
}

#game{
  width: min(78vw, 980px);
  height: auto;
  max-width: 100%;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,.10);
  background: rgba(10,14,28,.65);
}

/* Prompt overlay */
.prompt{
  position:absolute;
  inset: 14px;
  display:flex;
  align-items:center;
  justify-content:center;
  background: rgba(0,0,0,.55);
  border-radius: 16px;
}
.hidden{ display:none; }

.promptCard{
  width: min(620px, 94%);
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,.18);
  background: rgba(20,26,52,.92);
  box-shadow: 0 20px 60px rgba(0,0,0,.6);
  padding: 16px;
}
.promptCard h2{
  margin: 0 0 8px 0;
  font-size: 28px;
}
.promptCard p{
  margin: 0 0 14px 0;
  color: rgba(255,255,255,.92);
  line-height: 1.35;
  font-size: 16px;
  white-space: pre-line;
}
.promptButtons{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.promptSmall{
  margin-top: 10px;
  color: rgba(255,255,255,.75);
  font-size: 13px;
}

@media (max-width: 980px){
  .layout{grid-template-columns: 1fr; margin-bottom: 260px;}
  .panel{order: 2;}
  .stage{order: 1;}
  .teacherGrid{grid-template-columns: 1fr;}
  .teacherButtons{grid-template-columns: 1fr;}
}