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;}
}
/* Controles y accesibilidad */
#controls {
  margin: 1rem auto 0.5rem auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
#controls select#pairs-count {
  font-size: 1em;
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid #ddd;
}

.flag, .country {
  outline: none;
}
.flag:focus-visible, .country:focus-visible {
  box-shadow: 0 0 0 3px rgba(35, 105, 143, 0.35);
}
.flag[aria-disabled="true"], .country[aria-disabled="true"] {
  cursor: default;
  opacity: 0.85;
}

/* Modo oscuro básico */
@media (prefers-color-scheme: dark) {
  body {
    background: #0f1222;
    color: #eaeaf0;
  }
  #score, #status {
    color: #a0a3b0;
  }
  .flag, .country {
    background: #20233a;
    color: #eaeaf0;
    border-color: #2c3252;
    box-shadow: 0 2px 10px rgba(61, 90, 254, 0.12);
  }
  .flag.selected, .country.selected {
    background: #1e3a8a;
    border-color: #3d5afe;
    box-shadow: 0 0 0 2px #3d5afe;
  }
  .flag.matched, .country.matched {
    background: #1b5e20;
    color: #d7ffd9;
    border-color: #66bb6a;
    box-shadow: 0 0 0 2px #66bb6a;
  }
  #restart-btn {
    background: #3d5afe;
  }
  #restart-btn:hover {
    background: #0a2459;
  }
  #controls select#pairs-count {
    background: #20233a;
    color: #eaeaf0;
    border-color: #2c3252;
  }
}