/**
 * 全站统一页脚 — 参考极简四栏：纯黑底、标题白字、次级文案浅灰；末栏大屏右对齐
 */

.site-footer.site-footer--marketing {
  --site-footer-font-size: 0.9375rem;
  --site-footer-heading-size: 1rem;
  --site-footer-line: 1.55;
  --site-footer-muted: #c4c4c4;
  width: 100%;
  box-sizing: border-box;
  background: #000000;
  padding: 3rem 1.25rem max(2.25rem, env(safe-area-inset-bottom, 0px));
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

/* 正文后的页脚（关于页、协议页等）与上方内容留白 */
.site-footer.site-footer--marketing.site-footer--page {
  margin-top: 60px;
}

/* 导引条在 footer 外时：留白由导引条承担，避免与正文双段间距 */
nav.site-footer__toolbar + footer.site-footer.site-footer--marketing.site-footer--page {
  margin-top: 0;
}

nav.site-footer__toolbar:has(+ footer.site-footer.site-footer--marketing.site-footer--page) {
  margin-top: 60px;
}

/* 页脚区块上方的导引（原在 footer 内，现独立，不进 <footer> 语义） */
.site-footer__toolbar {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto 2rem;
  font-size: 0.875rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.35rem;
}

.site-footer__toolbar a.site-footer__link {
  color: #9ca3af;
  text-decoration: none;
  transition: color 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.site-footer__toolbar a.site-footer__link:hover {
  color: #e9d5ff;
  text-shadow: 0 0 14px rgba(232, 121, 249, 0.45), 0 0 22px rgba(34, 211, 238, 0.2);
}

.site-footer__toolbar .pipe {
  color: #4b5563;
  margin: 0 0.25rem;
  user-select: none;
}

.site-footer.site-footer--marketing.section-screen {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 100vh;
  width: 100%;
  /* 覆盖分屏页的 0 6rem，与首页 footer 左右留白一致 */
  padding-top: 2.75rem;
  padding-bottom: 2rem;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

@media (min-width: 768px) {
  .site-footer.site-footer--marketing {
    padding: 3rem 3rem max(2rem, env(safe-area-inset-bottom, 0px));
  }
  .site-footer.site-footer--marketing.section-screen {
    padding-left: 3rem;
    padding-right: 3rem;
  }
}

.site-footer__cols {
  max-width: 1200px;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem 2.25rem;
  margin-bottom: 2.25rem;
  text-align: left;
  justify-items: stretch;
  align-items: start;
}

@media (min-width: 520px) {
  .site-footer__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 2.5rem;
    row-gap: 2rem;
  }
}

@media (min-width: 960px) {
  .site-footer__cols {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 2rem 3rem;
    align-items: start;
  }

  /* 参考图：第四栏标题与图标靠右 */
  .site-footer__col--follow {
    justify-self: end;
    text-align: right;
    max-width: 18rem;
  }

  .site-footer__col--follow h3 {
    text-align: right;
  }

  .site-footer__col--follow .site-footer__icons {
    justify-content: flex-end;
  }
}

.site-footer__col {
  color: #fff;
  min-width: 0;
  text-align: left;
}

.site-footer__col h3 {
  font-size: var(--site-footer-heading-size);
  font-weight: 700;
  margin: 0 0 1rem;
  letter-spacing: 0.06em;
  line-height: 1.35;
  color: #ffffff;
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: var(--site-footer-font-size);
  font-weight: 400;
  line-height: var(--site-footer-line);
  color: var(--site-footer-muted);
}

.site-footer__links a,
.site-footer--marketing a.site-footer__link {
  color: var(--site-footer-muted);
  text-decoration: none;
  transition: color 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.site-footer__links a:hover,
.site-footer--marketing .site-footer__links a.site-footer__link:hover {
  color: #ffffff;
  text-shadow: none;
}

.site-footer__links p {
  margin: 0;
  font-size: var(--site-footer-font-size);
  font-weight: 400;
  line-height: var(--site-footer-line);
  color: var(--site-footer-muted);
  overflow-wrap: anywhere;
}

/* 「联系我们」：与其它栏同一左缘、同一字色与行高 */
.site-footer__col:has(.site-footer__links--contact) h3 {
  margin: 0 0 0.85rem;
}

.site-footer__links.site-footer__links--contact {
  align-items: flex-start;
  gap: 0.62rem;
  width: 100%;
}

.site-footer__links--contact p {
  display: block;
  line-height: 1.7;
  color: #d4d4d8;
}

.site-footer__links--contact .site-footer__link {
  color: #f1f5f9;
  letter-spacing: 0.01em;
  word-break: normal;
  overflow-wrap: anywhere;
}

.site-footer__links--contact .site-footer__link:hover {
  color: #ffffff;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.site-footer__icons {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  flex-wrap: wrap;
  gap: 1.35rem;
}

.site-footer__icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 0;
  opacity: 0.88;
  transition: opacity 0.2s ease;
  -webkit-tap-highlight-color: transparent;
}

.site-footer__icon-link:hover {
  opacity: 1;
}

.site-footer__icon-link:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.45);
  outline-offset: 3px;
  border-radius: 4px;
}

.site-footer--marketing .footer-icon {
  width: 26px;
  height: 26px;
  display: block;
  filter: brightness(0) invert(1);
  transition: opacity 0.2s ease;
}

.site-footer--marketing .footer-icon--logo {
  width: 28px;
  height: 28px;
  object-fit: contain;
}

.site-footer__rule {
  width: 100%;
  max-width: 1200px;
  height: 1px;
  background: rgba(255, 255, 255, 0.12);
  margin: 0 auto 1.5rem;
}

.site-footer__legal {
  width: 100%;
  max-width: 1200px;
  text-align: center;
  font-size: 11px;
  line-height: 1.65;
  color: #6b7280;
}

.site-footer__legal a {
  color: #6b7280;
  text-decoration: none;
  transition: color 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.site-footer__legal a:hover {
  color: #a5f3fc;
  text-shadow: 0 0 10px rgba(34, 211, 238, 0.35);
}

.site-footer__legal .pipe {
  margin: 0 1rem;
  color: #4b5563;
}

.site-footer__copy {
  margin-top: 0.75rem;
}

/* 触屏 / 键盘聚焦：与桌面 hover 一致展示二维码（index .qr-code、资讯 wrapper、关于页 wrapper） */
.site-footer__icon-wrapper:focus-within .footer-qrcode {
  display: flex;
}

.site-footer__icon-link:focus-within .footer-qrcode {
  display: block;
}

.site-footer__icon-link:focus-within .qr-code {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(10px);
}

.site-footer__icon-link:focus-within .qr-popup {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

.site-footer .qrcode-wrapper:focus-within .qrcode-popup {
  display: block;
}

.footer-icon-wrapper:focus-within .footer-qrcode {
  opacity: 1;
  visibility: visible;
}

/* 手机端：页脚字号与图标随屏宽等比缩小 */
@media (max-width: 768px) {
  .site-footer.site-footer--marketing {
    --site-footer-font-size: clamp(0.8rem, 2.75vw, 0.9375rem);
    --site-footer-heading-size: clamp(0.88rem, 2.95vw, 1rem);
  }

  .site-footer__legal {
    font-size: clamp(0.625rem, 2.5vw, 0.6875rem);
  }

  .site-footer--marketing .footer-icon {
    width: clamp(22px, 6vw, 26px);
    height: clamp(22px, 6vw, 26px);
  }

  .site-footer--marketing .footer-icon--logo {
    width: clamp(24px, 6.5vw, 28px);
    height: clamp(24px, 6.5vw, 28px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-footer--marketing .footer-icon,
  .site-footer__links a,
  .site-footer__toolbar a.site-footer__link,
  .site-footer__legal a,
  .site-footer__icon-link {
    transition: none;
  }
}