body {
  background: #eaf4f4;
  font-family: Arial, sans-serif;
  text-align: center;
  color: #22223b;
}
h1 {
  margin-top: 32px;
  color: #23698f;
}
#score {
  font-size: 1.18em;
  margin-bottom: 10px;
  color: #23698f;
}
#game {
  display: flex;
  justify-content: center;
  gap: 45px;
  margin: 30px auto 30px auto;
}
.flags, .countries {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.flag, .country {
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 1px 6px #bbb;
  padding: 8px 12px;
  font-size: 1.5em;
  cursor: pointer;
  transition: background .21s, box-shadow .18s;
  border: 2px solid #f4f9fa;
  outline: none;
}
.flag.selected, .country.selected {
  background: #82cfff;
  border-color: #23698f;
  box-shadow: 0 0 0 2px #23698f;
}
.flag.matched, .country.matched {
  background: #b4f7ab;
  color: #333;
  border-color: #3fb950;
  cursor: default;
  box-shadow: 0 0 0 2px #3fb950;
}
#restart-btn {
  background: #23698f;
  color: #fff;
  font-size: 1em;
  border: none;
  border-radius: 7px;
  padding: 8px 30px;
  cursor: pointer;
  margin-bottom: 12px;
  transition: background .18s;
}
#restart-btn:hover {
  background: #031c34;
}
#status {
  font-size: 1.12em;
  min-height: 2em;
  color: #23698f;
  margin-bottom: 10px;
}
@media (max-width: 850px) {
  #game { flex-direction: column; gap: 32px;}
  .flags, .countries { grid-template-columns: repeat(2,1fr);}
}
@media (max-width: 520px) {
  .flags, .countries { grid-template-columns: 1fr;}
}