:root {
  --rq-primary: #3b3fd6;
  --rq-correct: #1f8a4c;
  --rq-wrong: #c62828;
}

body {
  background: #f5f6fa;
  min-height: 100vh;
}

.navbar-brand {
  font-weight: 700;
  letter-spacing: 0.02em;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-logo {
  border-radius: 6px;
}

.join-code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: clamp(2rem, 8vw, 4rem);
  letter-spacing: 0.25em;
  font-weight: 700;
}

.option-btn {
  min-height: 4rem;
  font-size: 1.1rem;
  text-align: left;
  white-space: normal;
  position: relative;
}

.option-btn .option-key {
  display: inline-block;
  width: 2rem;
  height: 2rem;
  line-height: 2rem;
  text-align: center;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.12);
  margin-right: 0.75rem;
  font-weight: 700;
}

.option-btn.is-correct {
  border-color: var(--rq-correct);
  background: #e6f4ec;
}

.option-btn.is-wrong {
  border-color: var(--rq-wrong);
  background: #fdecea;
}

.option-btn.is-selected {
  outline: 3px solid var(--rq-primary);
}

.countdown {
  font-variant-numeric: tabular-nums;
  font-size: 2rem;
  font-weight: 700;
}

.countdown-bar {
  height: 0.5rem;
  transition: width 0.25s linear;
}

.question-media img,
.question-media video,
.question-media iframe {
  max-width: 100%;
  max-height: 40vh;
  border-radius: 0.5rem;
}

.question-media iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  height: auto;
}

.leaderboard li:nth-child(1) .rank { color: #d4a017; }
.leaderboard li:nth-child(2) .rank { color: #8a8a8a; }
.leaderboard li:nth-child(3) .rank { color: #b0703a; }
.leaderboard .rank { font-weight: 700; width: 2.5rem; display: inline-block; }

.chat-log {
  max-height: 16rem;
  overflow-y: auto;
  font-size: 0.9rem;
}

.chat-log .sender {
  font-weight: 600;
}

.result-flash {
  font-size: 1.5rem;
  font-weight: 700;
}

.result-flash.correct { color: var(--rq-correct); }
.result-flash.wrong { color: var(--rq-wrong); }

.toast-container {
  z-index: 1080;
}

.distribution-bar {
  height: 1.25rem;
}

.sr-only-focusable:focus {
  position: static;
  width: auto;
  height: auto;
}

@media (max-width: 575.98px) {
  .option-grid > * {
    flex: 0 0 100%;
    max-width: 100%;
  }

  .join-code {
    letter-spacing: 0.15em;
  }
}

/* Sponsor card: small, quiet, clearly labelled. Never shown during a running question. */
.sponsor-slot {
  display: flex;
  justify-content: center;
  margin-top: 2rem;
}

.sponsor-card {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  max-width: 28rem;
  padding: 0.5rem 0.9rem;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 0.5rem;
  background: #fff;
  color: inherit;
  font-size: 0.85rem;
  text-align: left;
  text-decoration: none;
}

.sponsor-card:hover,
.sponsor-card:focus-visible {
  border-color: rgba(0, 0, 0, 0.25);
}

.sponsor-card img {
  flex: none;
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: 6px;
}

.sponsor-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
  line-height: 1.25;
}

.sponsor-label {
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #6c757d;
}

.sponsor-name {
  font-weight: 600;
}

.sponsor-tagline {
  color: #495057;
}