/* =============== 通用字体、动画 =============== */
* {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
@keyframes iconWobble {
  0%   { transform: rotate(0deg); }
  15%  { transform: rotate(-15deg); }
  30%  { transform: rotate(10deg); }
  45%  { transform: rotate(-10deg); }
  60%  { transform: rotate(6deg); }
  75%  { transform: rotate(-6deg); }
  100% { transform: rotate(0deg); }
}

/* =============== 通用悬浮按钮 =============== */
.floating-btn {
  position: fixed;
  left: 30px;
  z-index: 9990;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.3s, box-shadow 0.3s;
}
.floating-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 18px rgba(0,0,0,0.2);
}
/* 增加粉丝、点赞服务按钮 */
#btn-buff {
  bottom: 180px;
  background: linear-gradient(135deg, #ff9f00 0%, #ffc107 100%);
  /* 可选动画 */
}

/* “联系我们”按钮：蓝绿渐变 + 晃动动画 + headset图标 */
#btn-contact {
  bottom: 60px;
  background: linear-gradient(135deg, #00a3ff 0%, #00d68f 100%);
  font-size: 20px;
  animation: iconWobble 2.5s infinite ease; 
}

/* “APP”按钮：蓝绿渐变 + 显示“APP”文字 */
#btn-app {
  bottom: 120px;
  background: linear-gradient(135deg, #2196f3 0%, #4caf50 100%);
  font-size: 14px;
  font-weight: 600;
  justify-content: center;
}

/* =============== 通用遮罩 =============== */
.sheet-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9991;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(2px);
  transition: opacity 0.3s ease;
  opacity: 0;
}
.sheet-overlay.active {
  display: block;
  opacity: 1;
}

/* =============== 通用底部弹窗 =============== */
.sheet {
  position: fixed;
  left: 50%;
  transform: translateX(-50%) translateY(120%); 
  bottom: 0;
  z-index: 9992;
  width: 100%;
  max-width: 600px;
  max-height: calc(100% - 1rem);
  background: #fff;
  border-radius: 16px 16px 0 0;
  box-shadow: 0 -6px 24px rgba(0,0,0,0.2);
  overflow: auto;
  transition: transform 0.4s ease;
}
.sheet.active {
  transform: translateX(-50%) translateY(0);
}

/* 顶部小把手、头部、关闭按钮 */
.sheet-handle {
  width: 50px;
  height: 5px;
  border-radius: 5px;
  background: #ccc;
  margin: 0.5rem auto 1rem;
}
.sheet-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
  padding: 0 1rem;
}
.sheet-title {
  font-size: 1.125rem;
  font-weight: 600;
}
/* 红色圆形关闭按钮 */
.sheet-close {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: #e00;
  color: #fff;
  font-size: 1.3rem;
  line-height: 36px;
  text-align: center;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

/* 主体 */
.sheet-body {
  padding: 0 1rem 1rem;
  line-height: 1.5;
  color: #333;
}
.sheet::-webkit-scrollbar {
  width: 6px;
}
.sheet::-webkit-scrollbar-track {
  background: #f2f2f2;
}
.sheet::-webkit-scrollbar-thumb {
  background: #ccc;
  border-radius: 3px;
}

/* =============== 联系我们弹窗 =============== */
#overlay-contact {}
#sheet-contact {}

/* =============== APP安装弹窗 =============== */
#overlay-app {}
#sheet-app {}

/* =============== APP安装: 不同设备区块 =============== */
.device-section {
  display: none;
  margin-top: 1rem;
  border: 1px solid #eee;
  border-radius: 8px;
  padding: 1rem;
}
.device-section h4 {
  margin-top: 0;
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.device-section p {
  margin-bottom: 0.5rem;
}

/* iOS额外弹窗 */
#ios-instructions {
  display: none;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  z-index: 10003;
  width: 90%;
  max-width: 320px;
  background: #fdfdfd;
  color: #333;
  border-radius: 12px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.3);
  padding: 1rem;
}
.ios-close-btn {
  position: absolute;
  top: 8px; 
  right: 8px;
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: #999;
  cursor: pointer;
  line-height: 1;
}
.ios-modal-title {
  text-align: center;
  margin: 0 0 0.5rem;
  font-size: 1.2rem;
  color: #333;
  font-weight: 600;
}
.ios-steps {
  margin: 0.75rem 0;
}
.ios-steps ol {
  margin-left: 1.5rem;
}
.ios-steps li {
  margin: 0.5rem 0;
  line-height: 1.4;
}
.ios-share-icon {
  width: 18px;
  vertical-align: middle;
  margin-left: 4px;
}
.ios-close-bottom {
  display: inline-block;
  margin-top: 1rem;
  background: linear-gradient(135deg, #2196f3 0%, #4caf50 100%);
  border: none;
  color: #fff;
  border-radius: 999px;
  padding: 0.5rem 1rem;
  font-size: 0.95rem;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
  cursor: pointer;
}


/* =========================================
   移动端优化：在屏幕宽度小于等于768px时 
   按钮整体变小，垂直间距更紧凑，避免遮挡
========================================= */
@media screen and (max-width: 768px) {
  .floating-btn {
    width: 40px;       /* 比原来稍小一点 */
    height: 40px;
    left: 15px;        /* 离屏幕左侧更近 */
  }
  /* 原本bottom距离可根据需求缩小，让它们在左下角不占太多视野 */
  #btn-buff {
    bottom: 130px;
  }
  #btn-app {
    bottom: 80px;
  }
  #btn-contact {
    bottom: 30px;
  }
  #btn-contact {
    font-size: 18px;  /* 适度缩小文字/图标 */
  }
}