:root {
  --bg: #0e0f16;
  --card: #141625;
  --accent: #7c5cff;
  --accent-2: #24d3ee;
  --text: #e6e6f0;
  --muted: #9aa0b4;
  --success: #2ecc71;
  --error: #ff4d4f;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: radial-gradient(1200px 600px at 10% 10%, rgba(124,92,255,.15), transparent) , radial-gradient(1000px 800px at 90% 80%, rgba(36,211,238,.12), transparent), var(--bg);
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, sans-serif;
}
#app { min-height: 100%; display: flex; align-items: flex-start; justify-content: center; }
.screen { display: none; width: 100%; }
.screen.active { display: block; padding: 16px; }
.card {
  width: min(520px, 100%);
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 16px;
  padding: 28px;
  backdrop-filter: blur(8px);
  box-shadow: 0 20px 60px rgba(0,0,0,.35);
  animation: fadeIn .45s ease both;
}
h1 { margin: 0 0 8px; font-size: 28px; letter-spacing: .4px; }
.subtitle { margin: 0 0 22px; color: var(--muted); }
.field { display: grid; gap: 8px; margin-bottom: 16px; }
label { color: var(--muted); font-size: 14px; }
select, input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(20,22,37,.6);
  color: var(--text);
  outline: none;
  transition: border .2s ease, box-shadow .2s ease, transform .08s ease;
}
select:focus, input:focus { border-color: var(--accent); box-shadow: 0 0 0 4px rgba(124,92,255,.15); }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 16px;
  border-radius: 12px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.14);
  color: var(--text);
  cursor: pointer;
  transition: transform .08s ease, background .2s ease, border .2s ease, box-shadow .2s ease;
}
.btn:hover { transform: translateY(-1px); background: rgba(255,255,255,.08); }
.btn:active { transform: translateY(0); }
.btn.primary { background: linear-gradient(90deg, var(--accent), var(--accent-2)); border: none; }
.btn.ghost { background: transparent; border-color: rgba(255,255,255,.18); }
.feedback { min-height: 22px; margin-top: 8px; color: var(--error); }
.topbar {
  position: sticky;
  top: 0;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  background: linear-gradient(180deg, rgba(14,15,22,.85), rgba(14,15,22,.6));
  border-bottom: 1px solid rgba(255,255,255,.08);
  backdrop-filter: blur(8px);
}
.player-info { font-weight: 600; }
.content {
  width: min(980px, 100%);
  margin: 0 auto;
  padding: 22px;
  display: grid;
  gap: 18px;
}
.questions { display: grid; gap: 16px; }
.question {
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 14px;
  padding: 16px;
  animation: popIn .35s ease both;
}
.question h3 { margin: 0 0 10px; font-size: 18px; }
.answer-wrap { display: grid; gap: 8px; }
.answer-feedback { min-height: 18px; font-size: 14px; color: var(--muted); }
.answer-feedback.ok { color: var(--success); }
.answer-feedback.bad { color: var(--error); }
.final-code.hidden { display: none; }
.code-card {
  display: grid;
  gap: 8px;
  justify-items: center;
  background: linear-gradient(180deg, rgba(124,92,255,.12), rgba(36,211,238,.12));
  border: 1px solid rgba(124,92,255,.35);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 12px 36px rgba(124,92,255,.22);
}
.code-card h2 { margin: 0; letter-spacing: .6px; }
.code-value {
  font-size: 40px;
  font-weight: 800;
  letter-spacing: 8px;
  color: #fff;
  text-shadow: 0 2px 0 rgba(0,0,0,.35), 0 10px 30px rgba(124,92,255,.35);
}
.code-note { color: var(--muted); }
.card.mqtt { width: 100%; max-width: 980px; }
.card.mqtt .row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-bottom: 10px; }
.card.mqtt .row:last-child { grid-template-columns: auto auto 1fr; align-items: center; }
.card.mqtt .status { color: var(--muted); padding-left: 8px; }
.card.mqtt .log { max-height: 160px; overflow: auto; border: 1px dashed rgba(255,255,255,.18); border-radius: 10px; padding: 8px; font-size: 13px; color: var(--muted); }
.card.control { width: 100%; max-width: 980px; }
.controls-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 12px; }
.group-title { font-weight: 600; color: var(--muted); margin: 6px 0 10px; }
.btn.toggle[aria-pressed="true"] { background: rgba(36,211,238,.18); border-color: rgba(36,211,238,.38); }
.btn.danger { background: linear-gradient(90deg, #ff4d4f, #ff7a45); border: none; color: #fff; }
.help {
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 14px;
  padding: 12px;
}
.help details { cursor: pointer; }
.help-grid { display: grid; place-items: center; }
.soup-img { width: min(520px, 100%); border: 1px solid rgba(255,255,255,.12); border-radius: 12px; box-shadow: 0 10px 28px rgba(0,0,0,.25); }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px) } to { opacity: 1; transform: translateY(0) } }
@keyframes popIn { from { opacity: 0; transform: scale(.98) } to { opacity: 1; transform: scale(1) } }
@media (max-width: 720px) {
  .topbar { position: relative; }
  .code-value { font-size: 34px; letter-spacing: 6px; }
  .card.mqtt .row { grid-template-columns: 1fr; }
  .controls-row { grid-template-columns: 1fr; }
}