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

body {
  background: #0a0f24;
  overflow: hidden;
  height: 100vh;
  width: 100vw;
  font-family: "Quicksand", "Poppins", sans-serif;
}

/* 烟花画布 */
canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 1; /* 完全不透明，最大化亮度 */
}

/* 星星背景 */
.stars {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}

.star {
  position: absolute;
  background: #f8f9fa;
  border-radius: 50%;
  animation: twinkle var(--d) ease-in-out infinite alternate;
  opacity: 0.8;
}

@keyframes twinkle {
  from {
    opacity: 0.3;
    transform: scale(0.9);
  }
  to {
    opacity: 0.8;
    transform: scale(1.1);
  }
}

/* 山脉底部装饰 */
.mountains {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 15vh;
  background: linear-gradient(to top, #141b38, transparent);
  z-index: 2;
  pointer-events: none;
}

/* 全屏按钮 */
.fullscreen-btn {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 20;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  color: #f8f9fa;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: all 0.3s ease;
}

.fullscreen-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

/* 静音按钮 */
.mute-btn {
  position: fixed;
  top: 20px;
  right: 74px;
  z-index: 20;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  color: #f8f9fa;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: all 0.3s ease;
}

.mute-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

/* 放烟花按钮 - 液态玻璃风格 */
.fireworks-btn {
  position: fixed;
  bottom: 50px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
  padding: 14px 36px;
  border-radius: 50px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  color: #f8f9fa;
  font-family: "Quicksand", sans-serif;
  font-size: 1.2rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
  pointer-events: auto;
  outline: none;
}

.fireworks-btn:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(255, 255, 255, 0.3);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.18);
  transform: translateX(-50%) translateY(-2px);
}

.fireworks-btn:active {
  transform: translateX(-50%) translateY(0);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
}

/* 英文文本 - 更靠上（调整为10%） */
.text-container {
  position: fixed;
  top: 10%; /* 从20%改为10%，更贴近顶部 */
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 10;
  text-align: center;
  pointer-events: none;
}

.main-text {
  font-size: 2.2rem;
  color: #f8f9fa;
  font-weight: 300;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
  text-shadow: 0 0 8px rgba(255, 255, 255, 0.2);
}

.sub-text {
  font-size: 1rem;
  color: #e0e7ff;
  font-weight: 200;
  letter-spacing: 0.05em;
  opacity: 0.8;
}