* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background: linear-gradient(135deg, #1a2a6c, #b21f1f, #fdbb2d);
  color: #000;
  line-height: 1.6;
  padding: 20px;
  min-height: 100vh;
}


body::before {
  content: "";
  position: fixed;
  left: 0;
  top: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  background: url(https://www.loliapi.com/acg/pe/) #fff;
  background-position: right center;
  background-size: auto 100%;
  background-attachment: fixed;
  opacity: 0.5;
}

.back {
  background: linear-gradient(135deg, #b21f1f, #fdbb2d);
  width: 60px;
  height: 60px;
  border-radius: 50%;
}

.container {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  background: transparent;
}

header {
  text-align: center;
  padding: 30px 0;
  color: white;
}

header h1 {
  font-size: 2.8rem;
  margin-bottom: 15px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

header p {
  font-size: 1.2rem;
  max-width: 1200px;
  margin: 0 auto;
  color: rgba(255, 255, 255, 0.9);
}

.card {
  background: #ffffffaa;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  padding: 25px;
  margin-bottom: 30px;
  transition: transform 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
}

.card h2 {
  color: #1a2a6c;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid #fdbb2d;
  display: flex;
  align-items: center;
}

.card h2 i {
  margin-right: 10px;
  color: #b21f1f;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 25px;
  margin-bottom: 30px;
}

.feature-item {
  background: #ffffffaa;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.feature-item h3 {
  color: #1a2a6c;
  margin-bottom: 15px;
  display: flex;
  align-items: center;
}

.feature-item h3 i {
  margin-right: 10px;
  color: #b21f1f;
}

.demo-player {
  text-align: center;
  padding: 30px;
  background: rgba(255, 255, 255, 0.9);
  border-radius: 12px;
  margin-top: 20px;
}

footer {
  position: fixed;
  left: 0;
  bottom: 0;
  z-index: 99999;
  width: 100%;
  text-align: center;
  color: #000;
  background: #fff;
  border-top: 1px solid #43484f;
}

@media all and (orientation : portrait){
  body::before  {
    background: url(https://www.loliapi.com/acg/pe/) #fff;
    background-size: auto 100%;
  }
}

@media (max-width: 768px) {
  .features {
    grid-template-columns: 1fr;
  }

  header h1 {
    font-size: 2.2rem;
  }

  .player-placeholder {
    height: 200px;
  }
}


/* 返回按钮样式 */
.back-button {
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 1000;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  color: #000;
  font-size: 20px;
}

.back-button:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
  background: rgba(255, 255, 255, 1);
  color: #6e8efb;
}

.back-button:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}


/* 响应式调整 */
@media (max-width: 768px) {
  .back-button {
    width: 44px;
    height: 44px;
    top: 15px;
    left: 15px;
  }

  .back-button i {
    font-size: 18px;
  }
}

.links {
  padding: 5px 10px;
  text-align: center;
}

.links a {
  color: #333;
  text-decoration: none;
}

.links a:hover {
  text-decoration: underline;
}


@media (max-width: 480px) {
  .back-button {
    width: 40px;
    height: 40px;
    top: 10px;
    left: 10px;
  }

  .back-button i {
    font-size: 16px;
  }
}