:root {
  --primary: #bf95f7;
  --purple-border: rgba(191, 149, 247, 0.4);
  --btn-gradient: linear-gradient(135deg, #7634ea, #b04ef6);
  --error-red: #ff4d4d;
  --gold: #ffd700;
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  background: #1a1a1a;
  color: #fff;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  overflow-x: hidden;
  overflow-y: auto;
  position: relative;
  display: flex;
  justify-content: center;
}
.container {
  width: 400px;
  min-height: 100vh;
  padding: 15px;
  display: flex;
  flex-direction: column;
}
.header {
  margin-top: 10px;
}
.description {
  color: #FF007F;
  font-size: 24px;
  text-align: center;
  margin-top: 100px;
  font-weight: 500;
}
.main-image-section {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 400px;
  height: 200vh;
  z-index: -1;
  overflow: hidden;
}
.scrolling-images {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 200%;
  animation: scrollBackground 30s linear infinite;
}
.scrolling-image {
  width: 100%;
  height: 50%;
  background-image: url('./changtu.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}
@keyframes scrollBackground {
  0% { transform: translateY(0); }
  100% { transform: translateY(-50%); }
}
.left-container {
  position: fixed;
  top: 15px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 15px;
  width: auto;
}
.title-text {
  width: 220px;
  height: 60px;
  background-size: contain;
  background-position: center;
  background-repeat: no-repeat;
  text-indent: -9999px;
  overflow: hidden;
}
.left-image-text-container {
  display: flex;
  align-items: center;
  gap: 15px;
  width: 100%;
  padding-left: 20px;
  padding-right: 20px;
}
.left-image {
  width: 60px;
  height: 60px;
  border-radius: 8px;
  overflow: hidden;
}
.left-image:hover {
  transform: scale(1.1);
}
.left-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.text-label {
  color: #fff;
  font-size: 20px;
  font-weight: bold;
  font-style: italic;
  font-family: "Comic Sans MS", "Comic Sans", cursive;
  line-height: 1.4;
  text-shadow: 0 2px 4px rgba(0,0,0,0.5);
  flex: 1;
  text-align: left;
}
.thumbnails {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  width: 400px;
  display: flex;
  gap: 5px;
  z-index: 5;
  overflow-x: auto;
  scrollbar-width: none;
}
.thumbnails::-webkit-scrollbar {
  display: none;
}
.thumbnails-container {
  display: flex;
  gap: 5px;
  animation: scroll 20s linear infinite;
}
@keyframes scroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}
.thumbnail {
  width: 120px;
  height: 200px;
  border-radius: 16px;
  object-fit: cover;
  border: none;
  box-shadow: 0 6px 16px rgba(0,0,0,0.5);
  transition: transform 0.3s ease;
}
.thumbnail:hover {
  transform: scale(1.05);
}

.download-button {
  position: fixed;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%) translateZ(0);
  z-index: 99999 !important;
  background: linear-gradient(145deg, #ff5a70, #fe2f50);
  border: none;
  border-radius: 50px;
  cursor: pointer;
  min-width: 240px;
  height: 75px;
  box-shadow:
    0 8px 30px rgba(254,78,96,0.7),
    0 0 40px rgba(255,60,80,0.8),
    0 0 60px rgba(255,100,120,0.6),
    inset 0 -4px 10px rgba(0,0,0,0.2),
    inset 0 4px 10px rgba(255,255,255,0.2);
  transition: all 0.35s cubic-bezier(0.175,0.885,0.32,1.275);
  text-decoration: none;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  will-change: transform, box-shadow;
  -webkit-font-smoothing: antialiased;
  animation: glowPulse 2.2s infinite ease-in-out;
}
.download-button span {
  color: #fff;
  font-size: 28px;
  font-weight: 900;
  text-shadow: 0 3px 8px rgba(0,0,0,0.4);
  letter-spacing: 1.5px;
  z-index: 2;
}
.download-button:hover {
  transform: translateX(-50%) scale(1.08) translateZ(0);
  box-shadow:
    0 12px 40px rgba(254,78,96,0.9),
    0 0 55px rgba(255,60,80,1),
    0 0 80px rgba(255,100,120,0.8),
    inset 0 -4px 10px rgba(0,0,0,0.25),
    inset 0 4px 10px rgba(255,255,255,0.25);
}
@keyframes glowPulse {
  0%,100% {
    box-shadow:
      0 8px 30px rgba(254,78,96,0.7),
      0 0 40px rgba(255,60,80,0.8),
      0 0 60px rgba(255,100,120,0.6),
      inset 0 -4px 10px rgba(0,0,0,0.2),
      inset 0 4px 10px rgba(255,255,255,0.2);
  }
  50% {
    box-shadow:
      0 10px 35px rgba(254,78,96,0.9),
      0 0 50px rgba(255,60,80,1),
      0 0 75px rgba(255,100,120,0.8),
      inset 0 -4px 10px rgba(0,0,0,0.2),
      inset 0 4px 10px rgba(255,255,255,0.2);
  }
}

@media (min-width: 768px) {
  .main-image-section {
    left: 50%;
    transform: translateX(-50%);
    width: 400px;
  }
  .container {
    width: 400px;
    margin: 0 auto;
  }
  body {
    display: flex;
    justify-content: center;
  }
  .left-container {
    left: 50%;
    transform: translateX(-50%);
  }
  .title-text {
    width: 220px;
    height: 60px;
  }
  .left-image-text-container {
    width: 400px;
    padding-left: 0;
    padding-right: 0;
  }
  .left-image {
    width: 70px;
    height: 70px;
  }
  .text-label {
    font-size: 16px;
  }
  .thumbnails {
    left: 50%;
    transform: translateX(-50%);
    width: 400px;
    bottom: 80px;
  }
  .download-button {
    height: 80px;
    min-width: 350px;
  }
  .download-button span {
    font-size: 36px;
  }
}