.bottom-nav {
  margin-top: 18px;
  padding: 72px 0;
  background-color: #0f1819;
  display: flex;
  justify-content: center;
}

/* ------------------------------------------------------------------
 * Bootstrap-like collapse fallback
 * Some pages (e.g. about.html) don't include bootstrap.min.css, but
 * friendLinkBoxExpand uses the Bootstrap collapse markup.
 * ------------------------------------------------------------------ */
.bottom-nav .collapse:not(.show) {
  display: none;
}

.bottom-nav .collapse.show {
  display: block;
}

.bottom-nav .collapsing {
  height: 0;
  overflow: hidden;
  transition: height 0.35s ease;
}

.bn-container {
  width: min(1720px, calc(100% - 120px));
  display: flex;
  flex-direction: column;
}

/* 页面级样式可能覆盖 a 颜色，这里统一收口 */
.bottom-nav a {
  text-decoration: none;
}

.bottom-nav a:hover {
  text-decoration: none;
}

/* 品牌 logo + BILIO2.tv */
.bn-brand {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  align-self: flex-start;
  gap: 6px;
}

.bn-logo {
  height: 44px;
  width: auto;
}

.bn-logo-sub {
  display: flex;
  align-items: center;
  gap: 7px;
  color: #ff2f8d;
  font-size: 15px;
  letter-spacing: 0.05em;
  line-height: 1;
}

.bn-logo-sub::before,
.bn-logo-sub::after {
  content: '';
  width: 10px;
  height: 1px;
  background-color: #ff2f8d;
}

/* 描述文案 + 即刻欣赏精彩影片 */
.bn-desc-row {
  margin-top: 90px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
}

.bn-desc {
  margin: 0;
  font-size: 18px;
  line-height: 32px;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.5);
}

.bottom-nav .bn-watch {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  color: #fff;
  font-size: 24px;
  font-weight: 500;
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.bottom-nav .bn-watch:hover {
  color: #ff4b8d;
}

.bn-watch-arrow {
  width: 56px;
  height: auto;
  padding-bottom: 8px;
}

/* 联系方式 */
.bn-contact {
  margin-top: 42px;
  display: flex;
  gap: 36px;
}

.bn-contact-line {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.bottom-nav .bn-contact-label {
  font-size: 16px;
  line-height: 18px;
  color: #9ca3af;
}

.bottom-nav .bn-contact-value {
  font-size: 18px;
  color: #f9fafb;
}

.bn-contact-line:hover .bn-contact-value {
  text-decoration: underline;
}

/* 快捷入口（来自 /translation/cache 的底部数据，无高亮） */
.bn-quick {
  margin-top: 50px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 32px;
}

.bn-quick-label {
  font-size: 16px;
  font-weight: 500;
  color: #fff;
}

.bottom-nav .bn-quick-item {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.7);
}

.bottom-nav .bn-quick-item:hover {
  color: #ff4b8d;
}

.bn-divider {
  margin-top: 28px;
  border-top: 1px solid #717171;
}

.bn-copyright {
  margin: 24px 0 0;
  text-align: center;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
}

/* ---------------- 移动端（设计稿 375 宽） ---------------- */
@media screen and (max-width: 824px) {
  .bottom-nav {
    margin-top: 0;
    padding: 42px 0;
  }

  .bn-container {
    width: calc(100% - 32px);
  }

  .bn-logo {
    height: 27px;
  }

  .bn-logo-sub {
    font-size: 9px;
    gap: 5px;
  }

  .bn-logo-sub::before,
  .bn-logo-sub::after {
    width: 6px;
  }

  .bn-desc-row {
    margin-top: 19px;
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
  }

  .bn-desc {
    font-size: 12px;
    line-height: 19.2px;
  }

  /* 移动端文案连排，不强制换行 */
  .bn-desc br {
    display: none;
  }

  .bottom-nav .bn-watch {
    font-size: 14px;
    gap: 6px;
  }

  .bn-watch-arrow {
    width: 34px;
    padding-bottom: 5px;
  }

  .bn-contact {
    margin-top: 19px;
    gap: 30px;
  }

  .bn-contact-line {
    gap: 3px;
  }

  .bottom-nav .bn-contact-label {
    font-size: 11px;
    line-height: 11px;
  }

  .bottom-nav .bn-contact-value {
    font-size: 12px;
  }

  .bn-quick {
    margin-top: 30px;
    width: 100%;
    justify-content: space-between;
    gap: 12px;
  }

  .bn-quick-label {
    font-size: 11px;
  }

  .bottom-nav .bn-quick-item {
    font-size: 11px;
  }

  .bn-divider {
    margin-top: 29px;
  }

  .bn-copyright {
    margin-top: 18px;
    font-size: 11px;
  }
}