html, body {
  margin: 0; padding: 0; width: 100vw; height: 100vh; overflow: hidden;
  font-family: '微软雅黑', sans-serif;
}
#bg-canvas {
  position: fixed; left: 0; top: 0; width: 100vw; height: 100vh; z-index: 0;
}
.main-content {
  position: relative; z-index: 1; display: flex; height: 100vh;
}
.sidebar {
  width: 100px; background: rgba(255,255,255,0.35); display: flex; flex-direction: column; align-items: center; padding-top: 24px;
  box-shadow: 2px 0 12px rgba(0,0,0,0.04);
}
.sidebar .logo { width: 80px; margin-bottom: 36px; }
.sidebar ul { list-style: none; padding: 0; margin: 0; }
.sidebar li { display: flex; flex-direction: column; align-items: center; margin-bottom: 28px; cursor: pointer; transition: transform 0.2s; }
.sidebar li:hover { transform: scale(1.08); }
.sidebar li img { width: 48px; height: 48px; border-radius: 50%; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.sidebar li span { font-size: 13px; margin-top: 6px; color: #333; }
.center {
  flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: flex-end; position: relative;
}
.download-section {
  background: rgba(255,255,255,0.92); border-radius: 24px; box-shadow: 0 4px 32px rgba(0,0,0,0.08);
  padding: 40px 48px; display: flex; flex-direction: column; align-items: center;
}
.download-row {
  display: flex;
  align-items: censter;
  gap: 32px;
  width: 100%;
  justify-content: center;
}
.qrcode {
  width: 140px;
  margin-bottom: 0;
  border-radius: 10px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.10);
}
.btns.download-btns {
  flex-direction: column;
  gap: 18px;
  align-items: flex-start;
}
.btn-content-wrap {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  height: 100%;
  margin-left: 80px;
}
.btn-content {
  font-size: 18px;
  line-height: 1.2;
  margin: 0;
  padding: 0;
  color: #fff;
  text-align: left;
  opacity: 0.92;
  font-weight: 500;
}
.btn-version {
  font-size: 10px;
  color: #fff;
  opacity: 0.65;
  margin: 0;
  margin-top: 4px;
  text-align: left;
  font-weight: 400;
  letter-spacing: 1px;
  white-space: nowrap;
  padding: 0;
}
.btn {
  display: inline-block; padding: 12px 32px; border-radius: 28px; color: #fff; text-decoration: none; font-size: 18px; font-weight: 500;
  box-shadow: 0 2px 8px rgba(0,0,0,0.10); transition: background 0.2s;
}
.iphone { background: #7b9cff; }
.iphone:hover { background: #5a7fdc; }
.android { background: #4ecb73; }
.android:hover { background: #36a85a; }
.web-link { color: #3a5fae; margin-top: 10px; font-size: 15px; text-decoration: underline; }
.download-section.transparent {
  background: rgba(255,255,255,0.35);
  box-shadow: none;
}
.spacer {
  flex: 1;
}
.site-footer {
  width: 100%; text-align: center; margin-top: 32px; margin-bottom: 18px;
}
.footer-content {
  color: #666; font-size: 13px; line-height: 1.7; background: rgba(255,255,255,0.7); border-radius: 12px; display: inline-block; padding: 8px 24px;
}
.site-name {
  color: #c6f6ff;
  font-size: 18px;
  font-weight: bold;
  margin-bottom: 18px;
  text-align: center;
  letter-spacing: 2px;
}
.btn-bg {
  position: absolute;
  left: 0; top: 0; width: 100%; height: 100%; object-fit: cover; border-radius: 12px;
  z-index: 0;
}
.iphone-download, .android-download {
  position: relative;
  width: 210px;
  height: 54px;
  border: none;
  background: none;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.10);
  margin-bottom: 18px;
  padding: 0;
}
.btn-icon {
  position: relative;
  z-index: 1;
  width: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: #fff;
  margin-right: 8px;
  flex-shrink: 0;
  margin-top: 2px;
}
.btn-content-wrap {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  height: 100%;
}
.btn-content {
  font-size: 18px;
  line-height: 1.2;
  margin: 0;
  padding: 0;
  color: #fff;
  text-align: left;
  opacity: 0.92;
  font-weight: 500;
}
.btn-version {
  font-size: 11px;
  color: #fff;
  opacity: 0.65;
  margin: 0;
  margin-top: 4px;
  text-align: left;
  font-weight: 400;
  letter-spacing: 1px;
  white-space: nowrap;
  padding: 0;
}
.web-link.no-border {
  background: none;
  border: none;
  box-shadow: none;
  color: #8be6f7;
  font-size: 16px;
  margin-top: 18px;
  text-decoration: underline;
  padding: 0;
  cursor: pointer;
}
.btn.iphone-download:hover, .btn.iphone-download:focus {
  filter: brightness(1.08) saturate(1.1);
  box-shadow: 0 4px 16px rgba(123,156,255,0.18);
}
.btn.android-download:hover, .btn.android-download:focus {
  filter: brightness(1.08) saturate(1.1);
  box-shadow: 0 4px 16px rgba(78,203,115,0.18);
}
.web-link.no-border:hover, .web-link.no-border:focus {
  color: #8be6f7;
  text-decoration: underline wavy #8be6f7 2px;
  background: none;
  outline: none;
  transition: color 0.2s;
}
@media (max-width: 700px) {
  .main-content { flex-direction: column; }
  .sidebar { flex-direction: row; width: 100vw; height: 80px; padding-top: 0; }
  .sidebar .logo { width: 60px; margin: 0 24px 0 0; }
  .sidebar ul { display: flex; flex-direction: row; }
  .sidebar li { margin: 0 12px; }
  .center { padding-top: 40px; }
  .download-section { padding: 18px 4vw; }
  .download-row { flex-direction: column; gap: 12px; }
  .qrcode { width: 90px; }
  .btn { font-size: 14px; padding: 8px 12px; }
  .footer-content { font-size: 11px; padding: 6px 6vw; }
}