/* 无限回归官网 · 全站统一底部导航
   10 个页面共用同一份结构与样式，保证从任何页面都能回跳站内入口。
   颜色跟随所在页面主题：深色页面默认深色值；浅底白皮书在 whitepaper-shell.css
   中按各自主题覆盖 --rwm-f-* 变量，避免在浅色正文上出现生硬的深色块。 */

footer.rwm-footer {
  display: block;
  box-sizing: border-box;
  margin: 0;
  padding: 44px 0 40px;
  border-top: 1px solid var(--rwm-f-line, rgba(255, 255, 255, .1));
  background: var(--rwm-f-bg, transparent);
  color: var(--rwm-f-ink, #f4f4f6);
  font-family: 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  font-weight: 300;
  line-height: 1.8;
  letter-spacing: normal;
  text-align: left;
  -webkit-font-smoothing: antialiased;
}

footer.rwm-footer * {
  box-sizing: border-box;
}

footer.rwm-footer .rwm-foot-wrap {
  width: min(1080px, calc(100% - 64px));
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

footer.rwm-footer .rwm-foot-top {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 18px;
  align-items: baseline;
}

footer.rwm-footer .rwm-foot-brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: 'Noto Serif SC', 'Songti SC', 'STSong', serif;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .14em;
  color: var(--rwm-f-ink, #f4f4f6);
  text-decoration: none;
  white-space: nowrap;
}

footer.rwm-footer .rwm-foot-word {
  display: inline-block;
}

footer.rwm-footer .rwm-foot-brand:hover,
footer.rwm-footer .rwm-foot-brand:focus-visible {
  color: var(--rwm-f-accent, #8fc2bc);
}

footer.rwm-footer .rwm-foot-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
  margin: 0;
  padding: 0;
}

footer.rwm-footer .rwm-foot-nav a {
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--rwm-f-ink-2, #9b9ba3);
  text-decoration: none;
  white-space: nowrap;
  transition: color .3s;
}

footer.rwm-footer .rwm-foot-nav a:hover,
footer.rwm-footer .rwm-foot-nav a:focus-visible {
  color: var(--rwm-f-ink, #f4f4f6);
}

footer.rwm-footer .rwm-foot-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  padding-top: 22px;
  border-top: 1px solid var(--rwm-f-line-soft, rgba(255, 255, 255, .055));
}

footer.rwm-footer .rwm-foot-links a {
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--rwm-f-ink-2, #9b9ba3);
  text-decoration: none;
  transition: color .3s;
}

footer.rwm-footer .rwm-foot-links a:hover,
footer.rwm-footer .rwm-foot-links a:focus-visible {
  color: var(--rwm-f-accent, #8fc2bc);
}

footer.rwm-footer .rwm-foot-copy {
  font-family: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 10px;
  letter-spacing: .22em;
  color: var(--rwm-f-ink-2, #8a8a92);
}

@media (max-width: 640px) {
  footer.rwm-footer {
    padding: 36px 0 32px;
  }

  footer.rwm-footer .rwm-foot-wrap {
    width: calc(100% - 40px);
  }

  footer.rwm-footer .rwm-foot-links {
    gap: 12px 22px;
  }
}

/* 页脚收口：版权与备案号按词组换行，避免“号”孤字 */
footer.rwm-footer .rwm-foot-copy {
  display: flex;
  flex-wrap: nowrap;
  align-items: baseline;
  column-gap: 6px;
  row-gap: 0;
  font-size: clamp(8px, 2.5vw, 10px);
  letter-spacing: .08em;
  white-space: nowrap;
}

footer.rwm-footer .rwm-copy-en,
footer.rwm-footer .rwm-copy-extra {
  white-space: nowrap;
}

footer.rwm-footer .rwm-copy-icp {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
}

footer.rwm-footer .rwm-copy-dot {
  color: var(--rwm-f-ink-3, #5e5e66);
}

@media (max-width: 640px) {
  footer.rwm-footer .rwm-foot-copy {
    font-size: clamp(8px, 2.5vw, 10px);
    letter-spacing: .06em;
    column-gap: 6px;
  }

  footer.rwm-footer .rwm-copy-dot {
    display: none;
  }
}