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

body {
  font-family: "Microsoft YaHei", sans-serif;
  /* background: linear-gradient(180deg, #0046a7, #689be8);
  background: linear-gradient(180deg, #0046a7, #7faef0); */
  background: linear-gradient(180deg, #0046a7, #6f9eff);
  color: white;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding-top: 40px;
}

.header {
  text-align: center;
  margin-bottom: 60px;
}

.logo-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
}

.logo {
  width: 60px;
  height: 60px;
  object-fit: contain;
}

.title {
  font-size: 3rem;
  font-weight: bold;
  margin: 0;
}

.divider {
  width: 100%;
  height: 1px;
  background-color: rgb(255, 255, 255);
  margin: 15px auto;
}

.release-info {
  display: flex;
  justify-content: center;
  gap: 80px;
  margin-bottom: 20px;
  font-size: 1.1rem;
  line-height: 1.8;
}

.release-item {
  flex: 1;
  text-align: left;
}

.release-date {
  font-weight: bold;
  font-size: 1.3rem;
  margin-left: 10px;
}

.download-buttons {
  display: flex;
  gap: 100px;
  margin-bottom: 40px;
}

.button {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.1);
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  text-decoration: none;
  color: white;
  font-size: 1rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.button:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}


/* === Android 按钮 3D 翻转效果 === */
.flip-container {
  width: 180px;
  height: 180px;
  perspective: 1000px;
  margin: 0 auto;
}

.flip-card {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.6s ease;
  transform-style: preserve-3d;
  border-radius: 50%;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  cursor: pointer;
}

.flip-container:hover .flip-card {
  transform: rotateY(-180deg);
}


/* 正面 */
.flip-card-front {
  background-color: rgba(255, 255, 255, 0.1);
  color: white;
}

.flip-card-front img {
  width: 60px;
  height: 60px;
  margin-bottom: 10px;
  object-fit: contain;
}

.flip-card-front .platform {
  font-weight: bold;
  font-size: 1.1rem;
  margin-bottom: 5px;
}

.flip-card-front .role {
  font-size: 0.9rem;
  opacity: 0.9;
}

/* 背面 */
.flip-card-back {
  background-color: white;
  color: black;
  transform: rotateY(-180deg);
}

.qr-wrapper {
  width: 100px;
  height: 100px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.qr-wrapper img {
  width: 80px;
  height: 80px;
  object-fit: contain;
}

/* === 平台组：包含圆 + 外部文字 === */
.platform-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px; /* 圆与文字的间距 */
}

/* === 通用圆形按钮样式 === */
.circle-button {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.1);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-decoration: none;
  color: white;

}

.circle-button img, .flip-card-front img {
  width: 60px;
  height: 60px;
  object-fit: contain;
}
.circle-button img {
  margin-bottom: 10px;
}

/* === 翻转容器 === */
.flip-container {
  perspective: 1000px;
  cursor: pointer;
}

.flip-card {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s ease;
  transform-style: preserve-3d;
  border-radius: 50%;
}

.flip-card-front {
  background-color: rgba(255, 255, 255, 0.1);
}

.flip-card-back {
  background-color: white;
  transform: rotateY(-180deg);
}

.flip-container:hover .flip-card {
  transform: rotateY(-180deg);
}

.flip-card-front, .flip-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 20px;  
  box-sizing: border-box;
}

.qr-wrapper {
  width: 100px;
  height: 100px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.qr-wrapper img {
  width: 80px;
  height: 80px;
  object-fit: contain;
}

/* === 外部文字样式 === */
.platform {
  font-weight: bold;
  font-size: 1.1rem;
}

.role {
  font-family: "Arial Normal", "Arial", sans-serif;
  font-weight: bold;
  font-style: normal;
  font-size: 18px;
}

.platform, .role {
  color: white;
  text-align: center;
}

footer {
  width: 100%;
  height: 20px;
  /* background-color: rgba(255, 255, 255, 0.1); */
  position: fixed;
  bottom: 30px;
  text-align: center;
}