.snackbar-container {
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  transition-property: top, right, bottom, left, opacity;
  font-size: 16px;
  font-weight: bolder;
  min-height: 60px;
  min-width: 720px;
  background-color: #2c3e50;
  position: fixed;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #ffffff;
  line-height: 24px;
  padding: 16px 24px;
  bottom: -100px;
  top: -100px;
  opacity: 0;
  z-index: 9999;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  border-radius: 8px;
  overflow: hidden;
  will-change: transform, opacity;
}

/* 进度条效果 */
.snackbar-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, 
    rgba(255, 255, 255, 0) 0%, 
    rgba(255, 255, 255, 0.1) 20%, 
    rgba(255, 255, 255, 0.3) 50%, 
    rgba(255, 255, 255, 0.1) 80%, 
    rgba(255, 255, 255, 0) 100%);
  background-size: 200% 100%;
  transform: translateX(-100%);
  animation: progress 3.5s linear forwards;
  pointer-events: none;
  z-index: 1;
}

/* 进度条动画 */
@keyframes progress {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* 自定义持续时间的进度条 */
.snackbar-container[data-duration="short"]::before { animation-duration: 2s; }
.snackbar-container[data-duration="medium"]::before { animation-duration: 4s; }
.snackbar-container[data-duration="long"]::before { animation-duration: 6s; }

.snackbar-container .action {
  background: inherit;
  display: inline-block;
  border: none;
  font-size: inherit;
  text-transform: uppercase;
  color: #4fc3f7;
  margin: 0 0 0 24px;
  padding: 8px 16px;
  min-width: min-content;
  cursor: pointer;
  font-weight: 600;
  letter-spacing: 0.05em;
  border-radius: 4px;
  transition: all 0.2s ease;
  z-index: 2;
}

.snackbar-container .action:hover {
  background-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-1px);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.snackbar-container .action:active {
  transform: translateY(0);
  box-shadow: none;
}

.snackbar-message {
  z-index: 2;
  flex-grow: 1;
  margin-right: 16px;
}

@media (min-width: 640px) {
  .snackbar-container {
    max-width: 720px;
    margin: 32px;
  }
}

@media (max-width: 640px) {
  .snackbar-container {
    left: 0;
    right: 0;
    width: 100%;
    border-radius: 0;
    margin: 0;
    min-width: auto;
  }
}

.snackbar-pos.bottom-center {
  top: auto !important;
  bottom: 0;
  left: 50%;
  transform: translate(-50%, 0);
}

.snackbar-pos.bottom-left {
  top: auto !important;
  bottom: 0;
  left: 0;
}

.snackbar-pos.bottom-right {
  top: auto !important;
  bottom: 0;
  right: 0;
}

.snackbar-pos.top-left {
  bottom: auto !important;
  top: 0;
  left: 0;
}

.snackbar-pos.top-center {
  bottom: auto !important;
  top: 0;
  left: 50%;
  transform: translate(-50%, 0);
}

.snackbar-pos.top-right {
  bottom: auto !important;
  top: 0;
  right: 0;
}

@media (max-width: 640px) {
  .snackbar-pos.bottom-center,
  .snackbar-pos.top-center {
    left: 0;
    transform: none;
  }
}

/* 显示状态 */
.snackbar-container.active {
  opacity: 1;
  bottom: 32px;
  top: auto;
  animation: fadeInUp 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.snackbar-container.active.top {
  bottom: auto;
  top: 32px;
  animation: fadeInDown 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* 隐藏状态 */
.snackbar-container.hiding {
  animation: fadeOut 0.3s ease forwards;
}

/* 动画效果 */
@keyframes fadeInUp {
  0% {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes fadeInDown {
  0% {
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes fadeOut {
  0% {
    opacity: 1;
    transform: scale(1);
  }
  100% {
    opacity: 0;
    transform: scale(0.95);
  }
}