/* Full-screen quiz app. */
html, body { overflow: hidden; }

.quiz {
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: row;
}
.quiz-main {
  flex: 1;
  min-width: 0;
  height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* Live leaderboard (left sidebar) ------------------------------------- */
.live-lb {
  width: 282px;
  flex: none;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  padding: 1.05rem 0.9rem;
  border-right: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
}
.live-lb[hidden] { display: none; }
@media (max-width: 940px) { .live-lb { display: none; } }

.llb-head { display: flex; align-items: center; gap: 0.5rem; padding: 0 0.3rem; }
.llb-title { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); font-weight: 700; }
.live-dot {
  width: 8px; height: 8px; border-radius: 50%; background: var(--good);
  animation: livePulse 1.8s infinite;
}
@keyframes livePulse {
  0% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.5); }
  70% { box-shadow: 0 0 0 7px rgba(34, 197, 94, 0); }
  100% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0); }
}

.llb-you {
  position: relative;
  display: flex; align-items: center; gap: 0.55rem;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 12px; padding: 0.55rem 0.8rem;
}
.llb-you-rank {
  font-size: 1.55rem; font-weight: 850; line-height: 1; font-variant-numeric: tabular-nums;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.llb-you-label { font-size: 0.66rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--faint); line-height: 1.1; }
.llb-move {
  margin-left: auto; font-weight: 800; font-size: 0.95rem;
  opacity: 0; transform: translateY(4px); transition: opacity 0.2s ease, transform 0.2s ease;
}
.llb-move.show { opacity: 1; transform: translateY(0); }
.llb-move.up { color: var(--good); }
.llb-move.down { color: var(--bad); }

.llb-list {
  list-style: none; flex: 1; min-height: 0; overflow-y: auto;
  display: flex; flex-direction: column; gap: 0.28rem; padding-right: 0.2rem;
}
.llb-row {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.46rem 0.55rem; border-radius: 10px; font-size: 0.9rem;
  border: 1px solid transparent;
  transition: opacity 0.35s ease, transform 0.35s ease;
}
.llb-row .r { width: 1.9rem; flex: none; text-align: center; color: var(--muted); font-weight: 700; font-variant-numeric: tabular-nums; }
.llb-row .n { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 600; }
.llb-row .e { font-weight: 800; font-variant-numeric: tabular-nums; color: var(--muted); }
.llb-row.me { background: rgba(99, 102, 241, 0.16); border-color: rgba(99, 102, 241, 0.4); }
.llb-row.me .e { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.llb-row.enter { opacity: 0; transform: translateY(7px); }
.llb-row.bump { animation: bump 0.7s ease; }
@keyframes bump {
  0%, 100% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0); }
  30% { box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.55); }
}

.llb-pinned { border-top: 1px dashed var(--border); padding-top: 0.5rem; flex: none; }

/* Top HUD ------------------------------------------------------------- */
.hud {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem clamp(1rem, 4vw, 2.4rem);
  border-bottom: 1px solid var(--border);
}
.hud .home { font-size: 1.05rem; font-weight: 800; letter-spacing: -0.02em; }
.hud .home .dot { color: var(--cyan); }

.hud-right { display: flex; align-items: center; gap: 0.7rem; }

.who { display: flex; flex-direction: column; align-items: flex-end; line-height: 1.1; }
.who .uname { font-weight: 750; }
.who .rank { font-size: 0.75rem; color: var(--cyan); font-weight: 700; }

.elo-box {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0.4rem 0.85rem;
}
.elo-label { font-size: 0.62rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--faint); }
.elo-value {
  font-size: 1.3rem; font-weight: 850; font-variant-numeric: tabular-nums;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.elo-delta {
  position: absolute; right: 0.6rem; top: -1.05rem;
  font-weight: 800; font-size: 0.95rem; opacity: 0; pointer-events: none;
}
.elo-delta.up { color: var(--good); }
.elo-delta.down { color: var(--bad); }
.elo-delta.pop { animation: deltaPop 1.1s ease forwards; }
@keyframes deltaPop {
  0% { opacity: 0; transform: translateY(8px); }
  15% { opacity: 1; transform: translateY(0); }
  80% { opacity: 1; }
  100% { opacity: 0; transform: translateY(-8px); }
}

/* Stage --------------------------------------------------------------- */
.stage {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: clamp(1.2rem, 3.5vh, 2.4rem);
  padding: clamp(1.2rem, 4vw, 2.6rem);
  width: min(880px, 100%);
  margin: 0 auto;
  text-align: center;
}

#qview {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(1.2rem, 3.5vh, 2.4rem);
  width: 100%;
}
#qview[hidden], .loader[hidden], .endcard[hidden] { display: none; }

.meta-row { display: flex; gap: 0.5rem; align-items: center; flex-wrap: wrap; justify-content: center; }
.badge-diff { text-transform: capitalize; }
.badge-diff[data-diff="easy"]   { color: #5eead4; border-color: rgba(94, 234, 212, 0.35); }
.badge-diff[data-diff="medium"] { color: #fcd34d; border-color: rgba(252, 211, 77, 0.35); }
.badge-diff[data-diff="hard"]   { color: #fb7185; border-color: rgba(251, 113, 133, 0.35); }
.pill.stake { color: var(--cyan); border-color: rgba(34, 211, 238, 0.3); }

.question {
  font-size: clamp(1.5rem, 4.4vw, 2.6rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
  font-weight: 750;
  max-width: 24ch;
}

.options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.9rem;
  width: 100%;
}
@media (max-width: 620px) { .options { grid-template-columns: 1fr; } }

.option {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  text-align: left;
  font: inherit;
  font-size: clamp(1rem, 2.2vw, 1.15rem);
  font-weight: 600;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem;
  cursor: pointer;
  transition: transform 0.1s ease, background 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease, opacity 0.18s ease;
}
.option:hover:not(:disabled) { transform: translateY(-2px); border-color: var(--indigo); background: rgba(99, 102, 241, 0.12); }
.option:focus-visible { outline: none; box-shadow: var(--ring); }
.option:disabled { cursor: default; }

.option .key {
  flex: none;
  width: 30px; height: 30px;
  display: grid; place-items: center;
  font-size: 0.82rem; font-weight: 800;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  border-radius: 9px;
}
.option .text { flex: 1; }

.option.correct { background: var(--good-bg); border-color: var(--good); color: #d1fae5; }
.option.correct .key { background: var(--good); color: #06281a; border-color: transparent; }
.option.wrong { background: var(--bad-bg); border-color: var(--bad); color: #fee2e2; }
.option.wrong .key { background: var(--bad); color: #3a0a0a; border-color: transparent; }
.option.dim { opacity: 0.4; }

.hint { color: var(--faint); font-size: 0.9rem; min-height: 1.3em; }
.hint-good { color: var(--good); font-weight: 700; }
.reveal-answer { color: var(--good); font-weight: 650; }

/* Loader -------------------------------------------------------------- */
.loader { display: flex; flex-direction: column; align-items: center; gap: 1rem; color: var(--muted); }
.spinner {
  width: 42px; height: 42px;
  border-radius: 50%;
  border: 3px solid var(--border);
  border-top-color: var(--indigo);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* End card (answered everything) -------------------------------------- */
.endcard {
  display: flex; flex-direction: column; align-items: center; gap: 0.55rem;
  max-width: 32rem;
}
.endcard .big-emoji { font-size: 3.5rem; }
.endcard h2 { font-size: 1.6rem; letter-spacing: -0.02em; }
.endcard p { color: var(--muted); }
.endcard .btn { margin-top: 1rem; }

/* Session bar --------------------------------------------------------- */
.session-bar {
  display: flex; gap: 1.1rem; justify-content: center; align-items: center;
  padding: 0.7rem 1rem; border-top: 1px solid var(--border);
  color: var(--muted); font-size: 0.85rem;
}
.session-bar b { color: var(--text); font-variant-numeric: tabular-nums; }
.session-bar .sb-label { color: var(--faint); text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.72rem; }

/* Shake on wrong ------------------------------------------------------ */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-7px); }
  40% { transform: translateX(7px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}
.wrong-shake { animation: shake 0.4s ease; }