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/* ===== footer.css - 页脚样式 ===== */

.footer .container {
  max-width: 1920px;
}

.footer {
  background-color: #191A6A; /* Abyss Intellect Purple */
  color: #DCDCE6; /* Minimal Gray */
  padding-left: 60px;
  padding-right: 60px;
  padding-bottom: 2.5rem;
  padding-top: 5rem;
}

.footer__inner {
  padding: 0;
}

/* ---- Main Layout ---- */
.footer__main {
  display: flex;
  flex-direction: column;
  gap: 48px;
}

@media (min-width: 1024px) {
  .footer__main {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
    gap: 32px;
  }
}

/* ---- Brand Column ---- */
.footer__brand {
  flex-shrink: 0;
}

@media (min-width: 1024px) {
  .footer__brand {
    width: 430px;
  }
}

.footer__logo {
  display: inline-flex;
  margin-bottom: 16px;
}

.footer__logo-img {
  height: 40px;
  width: auto;
  filter: brightness(0) invert(1);
}

.footer__slogan {
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 28px;
  line-height: 1.6;
  letter-spacing: 0.05em;
}

/* ---- Social Icon Row ---- */
.footer__social-icons {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.footer__social-icon-link {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.5);
  transition: color 0.2s;
  cursor: pointer;
}

.footer__social-icon-link:hover,
.footer__social-icon-link:focus-visible {
  color: #fff;
}

/* 后台上传的图片图标：建议上传 30×30，前台按此尺寸展示 */
.footer__social-icon-img {
  width: 22px;
  height: 22px;
  object-fit: contain;
  opacity: 0.5;
  transition: opacity 0.2s;
}

.footer__social-icon-link:hover .footer__social-icon-img,
.footer__social-icon-link:focus-visible .footer__social-icon-img {
  opacity: 1;
}

/* ---- Hover QR Code Popup ---- */
.footer__social-qr-pop {
  position: absolute;
  left: 50%;
  /* 与图标之间的向上间距，替代原先用 gap 撑开的写法 */
  bottom: calc(100% + 1rem);
  transform: translateX(-50%) translateY(4px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  /* 图片撑满内容区宽度，四边留白严格等于 padding，故不使用 gap 额外撑开间距。
     高度 = padding 0.75×2 + 图片 7.25 + 文字上边距 0.3125（5px）+ 文字行高 1.2（0.75rem × 1.6）= 10.2625rem */
  width: 8.75rem;
  height: 10.2625rem;
  box-sizing: border-box;
  padding: 0.75rem;
  background: #fff;
  border-radius: 0.5rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
  z-index: 10;
}

.footer__social-icon-link--qr:hover .footer__social-qr-pop,
.footer__social-icon-link--qr:focus-visible .footer__social-qr-pop,
.footer__social-icon-link--qr:focus-within .footer__social-qr-pop {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

.footer__social-qr-pop::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: #fff;
}

.footer__social-qr-pop img {
  /* 图片撑满内容区宽度（弹窗 8.75 - padding 0.75×2 = 7.25rem），
     保持正方形不变形，使左右留白与上方 padding 严格相等 */
  width: 7.25rem;
  height: 7.25rem;
  object-fit: cover;
  border-radius: 0.25rem;
}

.footer__social-qr-pop span {
  font-size: 0.75rem;
  color: #333;
  white-space: nowrap;
  margin-top: 5px;
}

/* ---- Contact ---- */
.footer__contacts {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  margin-bottom: 2rem;
}

.footer__contact-item {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.6);
}

.footer__contact-item a {
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  transition: color 0.2s;
}

.footer__contact-item a:hover {
  color: #fff;
}

.footer__contact-icon {
  flex-shrink: 0;
  font-size: 0.875rem;
  /* 与首行文字等高，保证多行时图标只对齐第一行并上下居中 */
  line-height: 1.6;
  height: calc(0.9375rem * 1.6);
  display: inline-flex;
  align-items: center;
  color: rgba(255, 255, 255, 0.5);
}

/* ---- Links ---- */
.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 4rem;
}

.footer__link-col {
  min-width: 120px;
}

.footer__link-title {
  font-size: 1rem; /* 16px */
  font-weight: 600;
  color: #fff;
  margin-bottom: 1.5rem;
}

/* 折叠按钮（桌面端隐藏箭头，仅显示文字） */
.footer__link-toggle {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
  font-weight: inherit;
  color: inherit;
  cursor: default;
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
}
.footer__toggle-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  transition: transform 0.25s ease;
  display: none;
}

/* 桌面端：列表始终展开，不受折叠状态影响 */
@media (min-width: 641px) {
  .footer__link-list {
    max-height: none !important;
    overflow: visible !important;
  }
  .footer__link-title {
    margin-bottom: 1.5rem !important;
  }
}

.footer__link-list {
  display: flex;
  flex-direction: column;
}

.footer__link-item {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.8);
  transition: color var(--transition-fast);
  cursor: pointer;
  display: block;
  line-height: 1.5rem;
  margin-top: 1rem;
}

a.footer__link-item:hover {
  color: #fff;
}

.footer__link-list li:first-child .footer__link-item {
  margin-top: 0;
}

.footer__link-item--disabled {
  cursor: default;
}

/* ---- Bottom Bar ---- */
.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  margin-top: 4rem;
  padding-top: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.footer__bottom-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.45);
  line-height: 1.5rem;
}

.footer__bottom-sep {
  color: rgba(255, 255, 255, 0.3);
}

@media (max-width: 640px) {
  .footer__bottom-sep {
    display: none;
  }
  .footer__bottom-row {
    flex-direction: column;
    text-align: center;
    gap: 4px;
  }
  .footer__bottom {
    border-top: none;
    padding-top: 0;
  }

  /* 手机端 footer 折叠 */
  .footer__links {
    flex-direction: column;
    gap: 0;
  }
  .footer__link-col {
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }
  .footer__link-title {
    margin-bottom: 0;
  }
  .footer__link-toggle {
    cursor: pointer;
    padding: 16px 0;
    justify-content: space-between;
  }
  .footer__toggle-icon {
    display: block;
  }
  .footer__link-toggle[aria-expanded="true"] .footer__toggle-icon {
    transform: rotate(180deg);
  }
  /* 列表默认折叠 */
  .footer__link-list {
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.3s ease;
    margin-bottom: 0;
  }
  .footer__link-col.is-open .footer__link-list {
    max-height: 600px;
    margin-bottom: 16px;
  }
}

.footer__bottom-highlight {
  color: rgba(255, 255, 255, 0.55);
  font-weight: 500;
}

.footer__bottom-icp {
  font-size: 0.875rem; /* 14px */
}

.footer__icp-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ---- Responsive ---- */
@media (min-width: 1024px) and (max-width: 1260px) {
  .footer__main {
    flex-direction: column;
  }

  .footer__brand {
    width: 100%;
  }

  .footer__links {
    flex-wrap: nowrap;
    gap: 20px 24px;
  }

  .footer__link-col {
    min-width: 140px;
    flex: 0 1 auto;
  }
}

@media (max-width: 768px) {
  .footer {
    padding-left: 20px;
    padding-right: 20px;
    padding-top: 3rem;
  }

  .footer__inner {
    padding-top: 0;
    padding-bottom: 0%;
  }

  .footer__links {
    gap: 20px 24px;
  }

  /* 同上：高度 = padding 0.75×2 + 图片 6.25 + 文字上边距 0.3125 + 文字行高 1.2 = 9.2625rem */
  .footer__social-qr-pop {
    width: 7.75rem;
    height: 9.2625rem;
  }

  .footer__social-qr-pop img {
    width: 6.25rem;
    height: 6.25rem;
  }
}