/* 1. 地下竞技场：暗黑与流光 */
:root {
  --blood-red: #8b0000;
  --neon-gold: #ffcc00;
  --arena-bg: rgba(20, 10, 10, 0.85);
}

/* 隐藏思维链 */
think { display: none; }

/* 2. 霓虹流光边框动画 */
.arena-main {
  position: relative;
  background: var(--arena-bg) !important;
  border: 2px solid;
  border-image: linear-gradient(45deg, var(--blood-red), var(--neon-gold), var(--blood-red)) 1;
  padding: 20px;
  box-shadow: 0 0 20px rgba(139, 0, 0, 0.5);
  animation: border-flow 3s linear infinite;
  backdrop-filter: blur(8px);
}

@keyframes border-flow {
  0% { filter: hue-rotate(0deg); }
  100% { filter: hue-rotate(15deg); }
}

/* 3. 火星飘散感（不遮挡背景图） */
.arena-main::before {
  content: " . ' . . ' . ";
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  color: var(--neon-gold);
  opacity: 0.3;
  pointer-events: none;
  animation: sparks 5s linear infinite;
}

@keyframes sparks {
  0% { transform: translateY(0); opacity: 0; }
  50% { opacity: 0.5; }
  100% { transform: translateY(-50px); opacity: 0; }
}

/* 4. 折叠栏美化：每一个都有小白狐 */
.arena-card {
  margin-top: 10px;
  background: rgba(0,0,0,0.6) !important;
  border: 1px solid #444;
}

summary {
  padding: 15px;
  color: #fff;
  font-weight: 900;
  cursor: pointer;
  list-style: none;
  text-shadow: 2px 2px 2px #000;
  position: relative;
}

/* 每一个折叠栏上的小白狐装饰 */
summary::after {
  content: "🦊";
  position: absolute;
  right: 15px;
  font-size: 18px;
  filter: drop-shadow(0 0 5px #fff);
  animation: fox-jump 2s ease-in-out infinite;
}

@keyframes fox-jump {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

/* 5. 脉动拳头按钮效果（模拟行动选项） */
.sc-action summary {
  background: linear-gradient(90deg, #8b0000 0%, #000 100%) !important;
  animation: pulse-fist 1.5s infinite;
}

@keyframes pulse-fist {
  0% { box-shadow: 0 0 0px var(--blood-red); }
  70% { box-shadow: 0 0 15px var(--blood-red); }
  100% { box-shadow: 0 0 0px var(--blood-red); }
}

/* 6. K.O. 盖章 */
.ko-stamp {
  position: absolute;
  bottom: 10px; right: 10px;
  font-family: 'Impact';
  font-size: 50px;
  color: rgba(255, 255, 255, 0.2);
  transform: rotate(-15deg);
  border: 5px solid rgba(255, 255, 255, 0.2);
  padding: 5px 15px;
  pointer-events: none;
}