@font-face {
  font-family: 'Source Han Sans SC VF';
  src: local('Source Han Sans SC VF'), url('https://fonts.gstatic.com/s/sourcehansanssc/vf/SourceHanSansSC-VF.woff2') format('woff2-variations');
  font-weight: 100 900;
  font-display: swap;
}
body {
  margin: 0;
  padding: 0;
  background: #fff !important;
  font-family: 'Source Han Sans SC VF', 'PingFang SC', 'Microsoft YaHei', Arial, sans-serif !important;
  font-weight: 400;
  color: #282C36 !important;
}

.main-header {
  display: flex;
  justify-content: space-between;
  align-items: center; /* 垂直居中对齐 */
  padding: 24px 32px 16px 32px; /* 减小页边距 */
  background: #ffffff; /* 统一底色 */
  border-bottom: none; /* 移除分割线 */
  box-shadow: none; /* 移除阴影 */
}

body, .main-header, .photography-section, .photography-cards, .photography-feature, .photography-card, .tab-pane {
  background: #ffffff !important;
}

.main-header, .main-header * , .main-header::before, .main-header::after {
  box-shadow: none !important;
  border: none !important;
  outline: none !important;
  background: transparent !important;
  color: #282C36 !important;
}

/* 强力去除 header 下方所有元素的顶部分割线和阴影 */
.main-header,
.main-header *,
.main-header::before,
.main-header::after,
body,
body *,
body::before,
body::after,
main,
main *,
main::before,
main::after,
.photography-section,
.photography-section *,
.photography-section::before,
.photography-section::after,
hr, .divider, .line {
  border: none !important;
  border-top: none !important;
  box-shadow: none !important;
  outline: none !important;
  background-image: none !important;
  /* display: block; 保证结构不塌陷 */
}

.header-left {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.logo-title {
  font-family: 'Source Han Sans SC VF', 'PingFang SC', 'Microsoft YaHei', Arial, sans-serif !important;
  font-size: 96px;
  font-weight: 900 !important;
  letter-spacing: 2px;
  color: #282C36 !important;
  line-height: 1;
  margin-bottom: 32px;
}

.logo-desc {
  margin-top: 10px;
  padding-left: 10px;
  font-size: 22px;
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Source Han Sans', 'Noto Sans SC', Arial, sans-serif;
  font-weight: 400;
  color: #23262b;
  opacity: 0.85;
  letter-spacing: 1px;
  line-height: 1.4;
  white-space: pre-line;
}

.header-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.header-title {
  font-family: 'Source Han Sans SC VF', 'PingFang SC', 'Microsoft YaHei', Arial, sans-serif !important;
  font-size: 96px;
  font-weight: 900 !important;
  letter-spacing: 2px;
  color: #282C36 !important;
  line-height: 1;
  margin-bottom: 32px;
}

.header-tabs {
  display: flex;
  align-items: center;
  font-size: 22px;
  font-weight: 400;
  gap: 0;
  margin-bottom: 32px;
}

.header-tabs a {
  color: #23262b;
  text-decoration: none;
  padding: 0 18px;
  font-weight: 400;
  transition: text-decoration 0.2s;
  letter-spacing: 1px;
}

.header-tabs a:hover {
  text-decoration: underline;
  color: #23262b;
}

.header-tabs a.active {
  color: #007bff;
  font-weight: 600;
  position: relative;
}

.header-tabs a.active::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  background: #007bff;
  border-radius: 2px;
}

.tab-divider {
  color: #b0b3b8;
  font-size: 22px;
  user-select: none;
  font-weight: 300; /* light */
}

.beta-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 48px auto 0 auto;
  width: fit-content;
  font-size: 28px;
  font-weight: 500;
  color: #23262b;
  background: #fff;
  border: 2px solid #23262b;
  border-radius: 32px;
  padding: 8px 32px 8px 24px;
  box-shadow: 0 2px 8px 0 rgba(40,44,54,0.04);
}
.beta-dot {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #00d26a;
  margin-right: 12px;
  box-shadow: 0 0 6px #00d26a99;
}

.scroll-down-icon {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 112px auto 100px auto;
  width: 48px;
  height: 48px;
  animation: scrollDown 1.5s infinite alternate;
}
@keyframes scrollDown {
  0% { transform: translateY(0); }
  100% { transform: translateY(16px); }
}

main#photography-main {
  margin-top: 200px;
}

body.photography-dark-bg .main-header {
  background: #18191b !important;
  align-items: center !important;
  position: fixed !important;
  top: 0;
  left: 0;
  width: 100vw;
  z-index: 1000;
  transition: background 0.4s cubic-bezier(0.4,0,0.2,1), box-shadow 0.4s;
  box-shadow: 0 2px 16px #0003;
}
body.photography-dark-bg .header-title {
  display: none !important;
}
body.photography-dark-bg .logo-title {
  font-size: 22px !important;
  font-weight: 400 !important;
  color: #fff !important;
  letter-spacing: 1px;
  margin-bottom: 0;
  transition: all 0.4s cubic-bezier(0.4,0,0.2,1);
}
body.photography-dark-bg .header-tabs a {
  color: #fff !important;
  font-size: 22px !important;
  font-weight: 400 !important;
  letter-spacing: 1px;
  transition: all 0.4s cubic-bezier(0.4,0,0.2,1);
}
body.photography-dark-bg .header-tabs a:hover {
  color: #fff !important;
  text-decoration: underline;
}
body.photography-dark-bg .logo-desc {
  display: none !important;
}
body.photography-dark-bg .header-right {
  align-items: center !important;
  min-width: unset !important;
  max-width: none !important;
  width: auto !important;
  flex: none !important;
}
body.photography-dark-bg .header-tabs {
  margin-bottom: 0 !important;
  gap: 12px !important;
  padding: 0 80px !important;
  white-space: nowrap !important;
  overflow: visible !important;
  flex-wrap: nowrap !important;
}
body.photography-dark-bg main#photography-main {
  margin-top: 80px !important;
}

@media (max-width: 1100px) {
  .logo-title {
    font-size: 64px;
  }
  .header-title {
    font-size: 44px;
  }
}

@media (max-width: 900px) {
  .main-header {
    flex-direction: row;
    align-items: flex-start;
    padding: 16px 8px 12px 8px;
  }
  .logo-title {
    font-size: 40px;
  }
  .header-title {
    font-size: 28px;
  }
  .logo-desc, .header-tabs {
    font-size: 14px;
  }
}

@media (max-width: 700px) {
  .main-header {
    flex-direction: row;
    align-items: flex-start;
    padding: 8px 2vw 8px 2vw;
  }
  .header-left, .header-right {
    min-width: 0;
    max-width: 50vw;
  }
  .logo-title, .header-title {
    font-size: 20vw;
    min-font-size: 24px;
  }
  .logo-desc, .header-tabs {
    font-size: 3vw;
  }
}