body { display: flex; flex-direction: column; min-height: 100vh; }

.page-center {
  max-width: 480px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
  width: 100%;
}

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0 1.5rem;
}

.brand { font-weight: 800; font-size: 1.25rem; }

.join-card h1 { margin-top: 0; font-size: 1.4rem; }

.footer-note { text-align: center; font-size: 0.8rem; margin-top: 2rem; }

.lobby-players {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  display: grid;
  gap: 0.5rem;
}
.lobby-players li {
  display: flex;
  justify-content: space-between;
  padding: 0.6em 0.9em;
  background: var(--bg-inset);
  border-radius: var(--radius-sm);
}
.lobby-players li.offline { opacity: 0.5; }

.room-code-display {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-align: center;
  padding: 0.75rem;
  border-radius: var(--radius-md);
  background: var(--bg-inset);
  margin: 1rem 0;
}

.timer-bar-track {
  height: 8px;
  background: var(--bg-inset);
  border-radius: 999px;
  overflow: hidden;
  margin: 1rem 0;
}
.timer-bar-fill {
  height: 100%;
  background: var(--accent);
  width: 100%;
  transition: width 0.2s linear;
}

.question-index { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 0.25rem; }
.question-text { font-size: 1.25rem; font-weight: 700; margin: 0.25rem 0 1.25rem; }

.choices {
  display: grid;
  gap: 0.75rem;
}
.choice-btn {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.9em 1.1em;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}
.choice-btn:hover:not(:disabled) { border-color: var(--accent); }
.choice-btn:disabled { cursor: default; }
.choice-btn.selected { border-color: var(--accent); background: var(--bg-inset); }
.choice-btn.correct { border-color: var(--success); background: var(--success-bg); color: var(--success); }
.choice-btn.incorrect { border-color: var(--danger); background: var(--danger-bg); color: var(--danger); }

.leaderboard-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  counter-reset: rank;
}
.leaderboard-list li {
  counter-increment: rank;
  display: flex;
  align-items: center;
  gap: 0.75em;
  padding: 0.6em 0.9em;
  border-radius: var(--radius-sm);
  background: var(--bg-inset);
  margin-bottom: 0.5rem;
}
.leaderboard-list li::before {
  content: counter(rank);
  font-weight: 800;
  color: var(--text-muted);
  width: 1.5em;
}
.leaderboard-list li:first-child { border: 1px solid var(--accent); }
.leaderboard-list .score { margin-left: auto; font-weight: 700; }

.result-banner {
  text-align: center;
  padding: 1rem;
  border-radius: var(--radius-md);
  font-weight: 700;
  margin-bottom: 1rem;
}
.result-banner.correct { background: var(--success-bg); color: var(--success); }
.result-banner.incorrect { background: var(--danger-bg); color: var(--danger); }

.host-controls { display: flex; gap: 0.75rem; margin-top: 1.25rem; }
.host-controls .btn { flex: 1; }

.center-msg { text-align: center; padding: 2rem 0; color: var(--text-muted); }