* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #5b7bff 0%, #1a1f3f 47%, #0f1121 100%);
  color: #f2f5ff;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.game-shell {
  width: min(100%, 980px);
  display: grid;
  gap: 24px;
}

.hero {
  text-align: center;
  padding: 18px 22px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 28px;
  backdrop-filter: blur(16px);
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 3.6rem);
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}

.hero p {
  font-size: 1rem;
  color: #d7deff;
  margin-bottom: 16px;
}

.mode-switch {
  display: inline-flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.mode-button {
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.08);
  color: #eef2ff;
  padding: 12px 20px;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}

.mode-button.selected {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0.12));
  border-color: rgba(255, 255, 255, 0.3);
  color: #0f1627;
}

.mode-button:hover {
  transform: translateY(-2px);
}

.battle-panel {
  display: grid;
  grid-template-columns: repeat(3, minmax(180px, 1fr));
  gap: 20px;
}

.card {
  padding: 22px;
  border-radius: 28px;
  background: rgba(17, 20, 48, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 18px 50px rgba(4, 9, 33, 0.35);
  text-align: center;
}

.card-label {
  display: block;
  font-size: 0.95rem;
  color: #b6c2ff;
  margin-bottom: 12px;
}

.player-name {
  display: block;
  color: #d7deff;
  font-size: 0.95rem;
  margin-top: 8px;
}

.card img {
  width: 130px;
  height: 130px;
  object-fit: contain;
  margin-bottom: 14px;
}

.choice-label {
  display: block;
  font-size: 1rem;
  color: #eef2ff;
}

.result-card {
  display: grid;
  gap: 16px;
  place-items: center;
  padding: 28px 20px;
}

#resultText {
  font-size: 1.15rem;
  padding: 16px 18px;
  border-radius: 18px;
  width: 100%;
  max-width: 270px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.result-win {
  color: #a7ffad;
}

.result-tie {
  color: #ffdd8b;
}

.result-lose {
  color: #ff8b8b;
}

.room-panel {
  display: grid;
  gap: 18px;
}

.room-actions {
  display: grid;
  gap: 16px;
}

.room-create {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
}

.room-create input {
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 18px;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.06);
  color: #eef2ff;
}

.room-create input::placeholder {
  color: rgba(255, 255, 255, 0.6);
}

.room-create button {
  min-width: 140px;
  border: none;
  border-radius: 18px;
  background: linear-gradient(135deg, #5a7dff, #00d0ff);
  color: #0f1627;
  padding: 14px 18px;
  cursor: pointer;
}

.room-list-box {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 24px;
  padding: 16px;
}

.room-list-box h3 {
  font-size: 1rem;
  margin-bottom: 12px;
  color: #d7deff;
}

.room-list {
  display: grid;
  gap: 12px;
}

.room-card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 18px;
  padding: 14px 16px;
}

.room-title {
  font-weight: 600;
  color: #eef2ff;
  margin-bottom: 8px;
}

.room-meta {
  color: #d7deff;
  font-size: 0.95rem;
  margin-bottom: 6px;
}

.room-button {
  border: none;
  background: #5a7dff;
  color: #ffffff;
  padding: 10px 14px;
  border-radius: 16px;
  cursor: pointer;
}

.room-button[disabled] {
  opacity: 0.45;
  cursor: default;
}

.room-status {
  display: block;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  padding: 16px 18px;
  color: #eef2ff;
}

.room-status.room-error {
  color: #ffb3b3;
}

.choices-panel {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

.choice-button {
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.08);
  color: #eef2ff;
  padding: 18px 18px 12px;
  border-radius: 24px;
  width: 150px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease, box-shadow 180ms ease;
}

.choice-button img {
  width: 80px;
  height: 80px;
}

.choice-button span {
  font-size: 1rem;
}

.choice-button:hover,
.choice-button:focus {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.34);
}

.choice-button.selected {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.18), rgba(255, 255, 255, 0.08));
  border-color: #99b7ff;
  box-shadow: 0 14px 32px rgba(71, 107, 255, 0.18);
}

.controls-panel {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

button#submit,
button#reset {
  min-width: 140px;
  padding: 14px 22px;
  border: none;
  border-radius: 24px;
  font-size: 1rem;
  cursor: pointer;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

#submit {
  background: linear-gradient(135deg, #5a7dff, #00d0ff);
  color: #0f1627;
  box-shadow: 0 18px 30px rgba(32, 121, 255, 0.28);
}

#reset.secondary {
  background: rgba(255, 255, 255, 0.08);
  color: #d7deff;
  border: 1px solid rgba(255, 255, 255, 0.16);
}

button#submit:hover,
button#reset:hover {
  transform: translateY(-2px);
}

.scoreboard {
  display: grid;
  grid-template-columns: repeat(3, minmax(100px, 1fr));
  gap: 14px;
  text-align: center;
}

.scoreboard div {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 16px 14px;
  border-radius: 18px;
}

.scoreboard strong {
  display: block;
  margin-bottom: 6px;
  color: #b6c2ff;
}

@media (max-width: 760px) {
  .battle-panel {
    grid-template-columns: 1fr;
  }

  .room-create {
    grid-template-columns: 1fr;
  }

  .choice-button {
    width: calc(33.333% - 10px);
  }
}

@media (max-width: 520px) {
  body {
    padding: 16px;
  }

  .choice-button {
    width: 100%;
  }

  .room-list-box,
  .room-create {
    width: 100%;
  }
}