* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-weight: 300;
}

body {
  font-family:"Microsoft YaHei";
  color: white;
  font-weight: 300;
}

.wrapper {
  background: #79a8ae;
  background: -webkit-linear-gradient(top, rgb(203, 235, 219) 0%, rgb(55, 148, 192) 120%);
  background: -moz-linear-gradient(top, rgb(203, 235, 219) 0%, rgb(55, 148, 192) 120%);
  background: -o-linear-gradient(top, rgb(203, 235, 219) 0%, rgb(55, 148, 192) 120%);
  background: -ms-linear-gradient(top, rgb(203, 235, 219) 0%, rgb(55, 148, 192) 120%);
  background: linear-gradient(top, rgb(203, 235, 219) 0%, rgb(55, 148, 192) 120%);
  position: absolute;
  top:0;
  left: 0;
  width: 100%;
  min-height: 100vh;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.container {
  max-width: 1500px;
  margin: 0 auto;
  padding: 40px 20px;
  text-align: center;
  z-index: 2;
  position: relative;
}

.site-title {
  color: #1a5276;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
  font-weight: 600;
  font-size: 36px;
  margin-bottom: 20px;
  animation: titleFloat 3s ease-in-out infinite;
}

.site-description {
  font-size: 18px;
  line-height: 1.6;
  margin-bottom: 40px;
  color: #333;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.features {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 25px;
  margin-bottom: 60px;
}

.feature-item {
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  border-radius: 20px;
  padding: 30px;
  flex: 1;
  min-width: 200px;
  max-width: 280px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  min-height: 280px;
  justify-content: space-between;
}

.feature-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.feature-icon {
  font-size: 48px;
  margin-bottom: 20px;
  display: block;
}

.feature-item h3 {
  color: #1a5276;
  font-weight: 600;
  margin-bottom: 15px;
  font-size: 20px;
}

.feature-item p {
  color: #333;
  font-size: 14px;
  line-height: 1.5;
}

.start-btn {
  -webkit-appearance: none;
     -moz-appearance: none;
          appearance: none;
  outline: 0;
  background: linear-gradient(135deg, #79a8ae 0%, #5594c0 100%);
  font-family: "Microsoft YaHei";
  border: 0;
  padding: 15px 40px;
  color: white;
  border-radius: 30px;
  cursor: pointer;
  font-size: 20px;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  margin-bottom: 40px;
  animation: heartbeat 1.5s ease-in-out infinite;
}

.start-btn:hover {
  background: linear-gradient(135deg, #8ab8c0 0%, #66a4d0 100%);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
  transform: translateY(-3px);
}

.start-btn:active {
  transform: translateY(0);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.footer {
  margin-top: 40px;
  font-size: 14px;
  color: #555;
}

.bg-bubbles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.bg-bubbles li {
  position: absolute;
  list-style: none;
  display: block;
  width: 40px;
  height: 40px;
  background-color: rgba(255, 255, 255, 0.15);
  bottom: -160px;
  -webkit-animation: square 30s infinite;
  animation: square 30s infinite;
  -webkit-transition-timing-function: linear;
  transition-timing-function: linear;
}

.bg-bubbles li:nth-child(1) {
  left: 10%;
}

.bg-bubbles li:nth-child(2) {
  left: 20%;
  width: 80px;
  height: 80px;
  -webkit-animation-delay: 2s;
          animation-delay: 2s;
  -webkit-animation-duration: 17s;
          animation-duration: 17s;
}

.bg-bubbles li:nth-child(3) {
  left: 25%;
  -webkit-animation-delay: 4s;
          animation-delay: 4s;
}

.bg-bubbles li:nth-child(4) {
  left: 40%;
  width: 60px;
  height: 60px;
  -webkit-animation-duration: 22s;
          animation-duration: 22s;
  background-color: rgba(255, 255, 255, 0.25);
}

.bg-bubbles li:nth-child(5) {
  left: 70%;
}

.bg-bubbles li:nth-child(6) {
  left: 80%;
  width: 120px;
  height: 120px;
  -webkit-animation-delay: 3s;
          animation-delay: 3s;
  background-color: rgba(255, 255, 255, 0.2);
}

.bg-bubbles li:nth-child(7) {
  left: 32%;
  width: 160px;
  height: 160px;
  -webkit-animation-delay: 7s;
          animation-delay: 7s;
}

.bg-bubbles li:nth-child(8) {
  left: 55%;
  width: 20px;
  height: 20px;
  -webkit-animation-delay: 15s;
          animation-delay: 15s;
  -webkit-animation-duration: 40s;
          animation-duration: 40s;
}

.bg-bubbles li:nth-child(9) {
  left: 25%;
  width: 10px;
  height: 10px;
  -webkit-animation-delay: 2s;
          animation-delay: 2s;
  -webkit-animation-duration: 40s;
          animation-duration: 40s;
  background-color: rgba(255, 255, 255, 0.3);
}

.bg-bubbles li:nth-child(10) {
  left: 90%;
  width: 160px;
  height: 160px;
  -webkit-animation-delay: 11s;
          animation-delay: 11s;
}

@keyframes titleFloat {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes heartbeat {
  0% {
    transform: scale(1);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  }
  14% {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
  }
  28% {
    transform: scale(1);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  }
  42% {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
  }
  70% {
    transform: scale(1);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  }
}

@-webkit-keyframes square {
  0% {
    -webkit-transform: translateY(0);
            transform: translateY(0);
  }
  100% {
    -webkit-transform: translateY(-900px) rotate(600deg);
            transform: translateY(-900px) rotate(600deg);
  }
}

@keyframes square {
  0% {
    -webkit-transform: translateY(0);
            transform: translateY(0);
  }
  100% {
    -webkit-transform: translateY(-900px) rotate(600deg);
            transform: translateY(-900px) rotate(600deg);
  }
}

/* 响应式设计 */
@media (max-width: 768px) {
  .site-title {
    font-size: 28px;
  }
  
  .site-description {
    font-size: 16px;
  }
  
  .features {
    flex-direction: column;
    align-items: center;
  }
  
  .feature-item {
    max-width: 300px;
    width: 100%;
  }
  
  .start-btn {
    font-size: 18px;
    padding: 12px 30px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 20px 15px;
  }
  
  .site-title {
    font-size: 24px;
  }
  
  .site-description {
    font-size: 14px;
  }
  
  .feature-item {
    padding: 20px;
  }
  
  .start-btn {
    font-size: 16px;
    padding: 10px 25px;
  }
  
  .footer {
    font-size: 12px;
  }
}