/* ═══ Login & Lobby ═══ */
#screen-login {
  align-items: center;
  justify-content: center;
  background: radial-gradient(ellipse at 50% 30%, #1a1a3e 0%, var(--bg-primary) 70%);
}

.title {
  font-size: 3rem;
  text-align: center;
  margin-bottom: 0.25rem;
  letter-spacing: 0.5rem;
}

.subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-weight: 400;
  margin-bottom: 2rem;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
}

.login-form input { text-align: center; max-width: 300px; }

.avatar-picker {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.avatar-option {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  cursor: pointer;
  transition: all var(--transition);
}
.avatar-option:hover { border-color: var(--accent); }
.avatar-option.selected { border-color: var(--accent); background: var(--accent-glow); }

/* ── Lobby ──────────────────── */
#screen-lobby { flex-direction: column; }

.lobby-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.profile-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.profile-avatar { font-size: 1.5rem; }
.profile-name { font-weight: 600; }
.profile-stats { color: var(--text-secondary); font-size: 0.85rem; }

.lobby-actions { display: flex; gap: 0.25rem; }

.mode-select { margin-bottom: 2rem; }
.mode-select h3 { margin-bottom: 0.75rem; color: var(--text-secondary); font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.1em; }

.mode-cards { display: flex; gap: 1rem; }

.mode-card {
  flex: 1;
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  cursor: pointer;
  text-align: center;
  transition: all var(--transition);
}
.mode-card:hover { border-color: var(--accent); }
.mode-card.selected { border-color: var(--accent); background: linear-gradient(135deg, var(--accent-glow), transparent); }
.mode-icon { font-size: 2rem; margin-bottom: 0.5rem; }
.mode-name { font-weight: 600; margin-bottom: 0.25rem; }
.mode-desc { font-size: 0.8rem; color: var(--text-secondary); }

.room-actions {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.join-row {
  display: flex;
  gap: 0.5rem;
}
.join-row input { text-transform: uppercase; text-align: center; font-weight: 700; letter-spacing: 0.2em; }

.room-code-display {
  text-align: center;
  margin-top: 2rem;
}
.code-big {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: 0.3em;
  color: var(--accent);
  margin: 0.5rem 0;
}
.waiting-text {
  color: var(--text-secondary);
  animation: pulse 1.5s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

/* ── Divider ──────────────── */
.divider {
  text-align: center;
  position: relative;
  margin: 0.5rem 0;
}
.divider::before {
  content: '';
  position: absolute;
  left: 0; right: 0; top: 50%;
  border-top: 1px solid var(--border);
}
.divider span {
  background: var(--bg-primary);
  padding: 0 1rem;
  position: relative;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.single-player-section {
  text-align: center;
}
.single-player-section h3 {
  margin-bottom: 0.75rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.difficulty-picker {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 1rem;
}
.diff-btn {
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.5rem 1rem;
  color: var(--text-primary);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.9rem;
  transition: all var(--transition);
}
.diff-btn:hover { border-color: var(--accent); }
.diff-btn.selected { border-color: var(--accent); background: var(--accent-glow); }

@media (max-width: 480px) {
  .title { font-size: 2.2rem; }
  .mode-cards { flex-direction: column; }
}