:root {
  --bg1: #f6f9ff;
  --bg2: #dfe8ff;
  --text: #13203a;
  --card: #ffffffcc;
  --accent: #1f6feb;
  --ok: #0f9d58;
  --ng: #d93025;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "BIZ UDPGothic", "Yu Gothic UI", sans-serif;
  color: var(--text);
  padding: 12px;
  min-height: 100vh;
  background: radial-gradient(circle at 20% 20%, #ffffff 0, transparent 35%),
              linear-gradient(160deg, var(--bg1), var(--bg2));
  display: grid;
  place-items: center;
}

.game {
  width: min(96vw, 760px);
  background: var(--card);
  border: 1px solid #c9d8ff;
  border-radius: 20px;
  padding: 24px;
  box-shadow: 0 18px 45px #6b7ca133;
  backdrop-filter: blur(4px);
}

h1 {
  margin: 0 0 8px;
  letter-spacing: 0.06em;
}

.hint {
  margin: 0 0 18px;
}

.display {
  min-height: 110px;
  border-radius: 16px;
  border: 2px dashed #9fb8ff;
  display: grid;
  place-items: center;
  font-size: clamp(1.5rem, 4.5vw, 3rem);
  font-weight: 800;
  letter-spacing: 0.02em;
  background: #f9fbff;
  white-space: nowrap;
  overflow-x: auto;
  overflow-y: hidden;
}

.choices {
  margin-top: 16px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.choice {
  border: 1px solid #aac1ff;
  background: #ffffff;
  color: var(--text);
  border-radius: 12px;
  padding: 14px 10px;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: transform .1s ease, border-color .1s ease;
}

.choice:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
}

.choice.correct {
  border-color: var(--ok);
  color: var(--ok);
}

.choice.wrong {
  border-color: var(--ng);
  color: var(--ng);
}

.controls {
  margin-top: 18px;
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

select,
button {
  font: inherit;
  padding: 8px 12px;
  min-height: 44px;
  border-radius: 10px;
  border: 1px solid #a8beff;
  background: #fff;
}

button {
  background: var(--accent);
  color: #fff;
  border-color: transparent;
  cursor: pointer;
}

.status {
  margin: 16px 0 0;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.choices.images-mode .choice {
  font-size: 1.8rem;
  line-height: 1.25;
}

@media (max-width: 640px) {
  body {
    padding: 10px;
    align-items: start;
  }

  .game {
    width: 100%;
    border-radius: 16px;
    padding: 16px;
  }

  h1 {
    font-size: 1.6rem;
  }

  .hint {
    font-size: 0.95rem;
  }

  .display {
    min-height: 92px;
    font-size: clamp(1.3rem, 8vw, 2.4rem);
  }

  .controls {
    display: grid;
    gap: 8px;
  }

  .controls label {
    display: grid;
    gap: 6px;
    font-size: 0.95rem;
  }

  select,
  button,
  .choice {
    width: 100%;
    font-size: 1rem;
  }

  .status {
    font-size: 0.92rem;
    line-height: 1.5;
  }
}