/* ============================================================
   漂浮社交栏样式（floatbar.css）
   自包含设计：不依赖任何模板 CSS 变量与框架，任何模板直接可用。
   全部颜色/尺寸由 .fb-bar 内部变量驱动，皮肤类 .fb-style-{name} 切换。
   皮肤：light 亮白百搭(默认) / dark 深色胶囊 / glass 毛玻璃 /
        gradient 深海渐变 / outline 极简描边 / label 悬停展名
   ============================================================ */

/* ---------- 基础隔离：防模板全局样式污染 ---------- */
.fb-bar, .fb-footer, .fb-share,
.fb-bar *, .fb-footer *, .fb-share * {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
.fb-bar a, .fb-footer a, .fb-share a {
  text-decoration: none !important;
  box-shadow: none;
}
.fb-bar a:hover, .fb-footer a:hover, .fb-share a:hover {
  text-decoration: none !important;
}
.fb-bar img, .fb-footer img, .fb-share img {
  max-width: none;
  border: 0;
}

/* SVG 图标：currentColor 继承父级颜色，1em 跟随父级 font-size */
.fb-icon-svg {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1em;
  height: 1em;
  line-height: 0;
  flex: none;
}
.fb-icon-svg svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* ============================================================
   漂浮社交栏
   ============================================================ */
.fb-bar {
  position: fixed !important;
  top: 40%;
  z-index: 1200;
  display: flex;
  flex-direction: column;
  align-items: center;
  font-family: inherit;
  line-height: 1;

  /* —— 皮肤变量（默认值 = light 亮白百搭） —— */
  --fb-bg: rgba(255, 255, 255, 0.96);
  --fb-pad: 10px 7px;
  --fb-radius: 16px;
  --fb-border: 1px solid rgba(15, 23, 42, 0.08);
  --fb-shadow: 0 6px 24px rgba(15, 23, 42, 0.12);
  --fb-gap: 4px;
  --fb-ic-size: 38px;
  --fb-ic-font: 17px;
  --fb-ic-bg: transparent;
  --fb-ic-color: #5b6472;
  --fb-ic-radius: 10px;
  --fb-ic-border: none;
  --fb-ic-shadow: none;
  --fb-ic-hov-bg: #eef3ff;
  --fb-ic-hov-color: #2563eb;
  --fb-ic-hov-border: none;
  --fb-ic-hov-shadow: none;
  --fb-ic-hov-tf: translateY(-2px);
  --fb-btn-mt: 6px;
  --fb-btn-bg: #2563eb;
  --fb-btn-color: #ffffff;
  --fb-btn-border: none;
  --fb-btn-hov-bg: #1d4ed8;
  --fb-btn-hov-color: #ffffff;
  --fb-btn-hov-border: none;
  --fb-btn-shadow: 0 4px 12px rgba(37, 99, 235, 0.30);
  --fb-close-bg: #f1f3f6;
  --fb-close-color: #98a1ad;
  --fb-close-hov-bg: #e2e7ed;
  --fb-close-hov-color: #5b6472;
  --fb-pop: 54px;
  --fb-slide: 40px;

  background: var(--fb-bg);
  border: var(--fb-border);
  border-radius: var(--fb-radius);
  box-shadow: var(--fb-shadow);
  padding: var(--fb-pad);
  transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s ease;
  animation: fb-bar-in 0.5s cubic-bezier(0.22, 1, 0.36, 1) backwards;
}
.fb-bar-right { right: 14px; --fb-slide: 40px;  }
.fb-bar-left  { left: 14px;  --fb-slide: -40px; }

/* 入场：从贴边方向滑入 */
@keyframes fb-bar-in {
  from { opacity: 0; transform: translateX(var(--fb-slide)); }
  to   { opacity: 1; transform: translateX(0); }
}
@media (prefers-reduced-motion: reduce) {
  .fb-bar { animation: none; }
}

.fb-bar .fb-icons {
  display: flex;
  flex-direction: column;
  gap: var(--fb-gap);
  width: 100%;
  align-items: center;
}

/* 图标 */
.fb-bar .fb-icon {
  width: var(--fb-ic-size);
  height: var(--fb-ic-size);
  background: var(--fb-ic-bg);
  color: var(--fb-ic-color);
  border-radius: var(--fb-ic-radius);
  border: var(--fb-ic-border);
  box-shadow: var(--fb-ic-shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fb-ic-font);
  position: relative;
  cursor: pointer;
  transition: background-color 0.25s ease, color 0.25s ease,
              border-color 0.25s ease, box-shadow 0.25s ease,
              transform 0.25s cubic-bezier(0.22, 1, 0.36, 1);
}
.fb-bar .fb-icon:hover {
  background: var(--fb-ic-hov-bg);
  color: var(--fb-ic-hov-color);
  border: var(--fb-ic-hov-border);
  box-shadow: var(--fb-ic-hov-shadow);
  transform: var(--fb-ic-hov-tf);
}

/* 二维码弹层：默认隐藏，悬停显示 */
.fb-bar .fb-qr-popup {
  position: absolute;
  top: 50%;
  bottom: auto;
  transform: translateY(-50%) scale(0.85);
  background: #fff;
  border: 1px solid rgba(15, 23, 42, 0.06);
  border-radius: 12px;
  padding: 12px;
  box-shadow: 0 10px 32px rgba(15, 23, 42, 0.16);
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s ease;
  z-index: 10;
  pointer-events: none;
  min-width: 130px;
}
.fb-bar .fb-qr-popup img {
  width: 120px;
  height: 120px;
  display: block;
  border-radius: 6px;
}
.fb-bar-right .fb-qr-popup { left: auto; right: var(--fb-pop); }
.fb-bar-right .fb-qr-popup:after {
  content: '';
  position: absolute;
  left: 100%;
  top: 50%;
  transform: translateY(-50%);
  border: 8px solid transparent;
  border-left-color: #fff;
}
.fb-bar-left .fb-qr-popup { left: var(--fb-pop); right: auto; }
.fb-bar-left .fb-qr-popup:after {
  content: '';
  position: absolute;
  right: 100%;
  top: 50%;
  transform: translateY(-50%);
  border: 8px solid transparent;
  border-right-color: #fff;
}
.fb-bar .fb-icon-qr:hover .fb-qr-popup {
  opacity: 1;
  visibility: visible;
  transform: translateY(-50%) scale(1);
}

/* 返回顶部按钮 */
.fb-bar .fb-back-top {
  background: var(--fb-btn-bg);
  color: var(--fb-btn-color);
  border: var(--fb-btn-border);
  box-shadow: var(--fb-btn-shadow);
  font-size: 18px;
  margin-top: var(--fb-btn-mt);
  border-radius: var(--fb-ic-radius);
  width: var(--fb-ic-size);
  height: var(--fb-ic-size);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.25s ease, color 0.25s ease,
              border-color 0.25s ease, box-shadow 0.25s ease,
              transform 0.25s cubic-bezier(0.22, 1, 0.36, 1);
}
.fb-bar .fb-back-top:hover {
  background: var(--fb-btn-hov-bg);
  color: var(--fb-btn-hov-color);
  border: var(--fb-btn-hov-border);
  transform: var(--fb-ic-hov-tf);
}

/* 关闭按钮：默认隐藏，移动端显示 */
.fb-bar .fb-close {
  width: var(--fb-ic-size);
  height: var(--fb-ic-size);
  background: var(--fb-close-bg);
  color: var(--fb-close-color);
  border: none;
  border-radius: var(--fb-ic-radius);
  display: none;
  align-items: center;
  justify-content: center;
  margin-top: 6px;
  font-size: 15px;
  cursor: pointer;
  transition: background-color 0.25s ease, color 0.25s ease;
}
.fb-bar .fb-close:hover {
  background: var(--fb-close-hov-bg);
  color: var(--fb-close-hov-color);
}

/* 关闭状态：向贴边方向滑出 */
.fb-bar.fb-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
.fb-bar-right.fb-hidden { transform: translateX(calc(100% + 20px)); }
.fb-bar-left.fb-hidden  { transform: translateX(calc(-100% - 20px)); }

/* ============================================================
   皮肤 1/6：light 亮白百搭 —— 即 .fb-bar 变量默认值，无需覆盖
   ============================================================ */

/* ============================================================
   皮肤 2/6：dark 深色胶囊
   ============================================================ */
.fb-style-dark {
  --fb-bg: #1f2937;
  --fb-pad: 14px 7px 10px;
  --fb-radius: 50px;
  --fb-border: 1px solid rgba(255, 255, 255, 0.06);
  --fb-shadow: 0 8px 28px rgba(15, 23, 42, 0.30);
  --fb-gap: 2px;
  --fb-ic-color: #d1d5db;
  --fb-ic-radius: 50%;
  --fb-ic-hov-bg: #2563eb;
  --fb-ic-hov-color: #ffffff;
  --fb-ic-hov-tf: none;
  --fb-close-bg: rgba(255, 255, 255, 0.10);
  --fb-close-color: #d1d5db;
  --fb-close-hov-bg: rgba(255, 255, 255, 0.20);
  --fb-close-hov-color: #ffffff;
}

/* ============================================================
   皮肤 3/6：glass 毛玻璃
   ============================================================ */
.fb-style-glass {
  --fb-bg: rgba(20, 25, 34, 0.50);
  --fb-pad: 12px 7px 9px;
  --fb-radius: 18px;
  --fb-border: 1px solid rgba(255, 255, 255, 0.16);
  --fb-shadow: 0 12px 36px rgba(0, 0, 0, 0.30);
  --fb-ic-bg: rgba(255, 255, 255, 0.12);
  --fb-ic-color: #f2f5f8;
  --fb-ic-radius: 11px;
  --fb-ic-hov-bg: #ffffff;
  --fb-ic-hov-color: #1c2230;
  --fb-ic-hov-tf: scale(1.06);
  --fb-btn-bg: #ffffff;
  --fb-btn-color: #1c2230;
  --fb-btn-hov-bg: #e9edf3;
  --fb-btn-hov-color: #1c2230;
  --fb-btn-shadow: 0 4px 14px rgba(0, 0, 0, 0.22);
  --fb-close-bg: rgba(255, 255, 255, 0.16);
  --fb-close-color: #ffffff;
  --fb-close-hov-bg: rgba(255, 255, 255, 0.30);
  --fb-close-hov-color: #ffffff;
  -webkit-backdrop-filter: blur(16px) saturate(1.5);
  backdrop-filter: blur(16px) saturate(1.5);
}

/* ============================================================
   皮肤 4/6：gradient 深海渐变
   ============================================================ */
.fb-style-gradient {
  --fb-bg: linear-gradient(165deg, #0e2a3a 0%, #1b4965 55%, #2c6e7f 100%);
  --fb-pad: 12px 7px 9px;
  --fb-radius: 20px;
  --fb-border: 1px solid rgba(255, 255, 255, 0.09);
  --fb-shadow: 0 14px 38px rgba(20, 60, 80, 0.42),
               inset 0 1px 0 rgba(255, 255, 255, 0.16);
  --fb-ic-bg: rgba(255, 255, 255, 0.10);
  --fb-ic-color: #dcebf2;
  --fb-ic-radius: 11px;
  --fb-ic-hov-bg: linear-gradient(135deg, #ff8a5c, #ff5e62);
  --fb-ic-hov-color: #ffffff;
  --fb-ic-hov-tf: scale(1.08);
  --fb-ic-hov-shadow: 0 6px 16px rgba(255, 94, 98, 0.35);
  --fb-btn-bg: linear-gradient(135deg, #ff8a5c, #ff5e62);
  --fb-btn-color: #ffffff;
  --fb-btn-hov-bg: linear-gradient(135deg, #ff9a6f, #ff6f73);
  --fb-btn-hov-color: #ffffff;
  --fb-btn-shadow: 0 4px 14px rgba(255, 94, 98, 0.30);
  --fb-close-bg: rgba(0, 0, 0, 0.22);
  --fb-close-color: #ffffff;
  --fb-close-hov-bg: rgba(0, 0, 0, 0.42);
  --fb-close-hov-color: #ffffff;
}

/* ============================================================
   皮肤 5/6：outline 极简描边
   ============================================================ */
.fb-style-outline {
  --fb-bg: transparent;
  --fb-pad: 4px 2px;
  --fb-radius: 24px;
  --fb-border: none;
  --fb-shadow: none;
  --fb-gap: 8px;
  --fb-ic-bg: rgba(255, 255, 255, 0.94);
  --fb-ic-color: #5b6672;
  --fb-ic-radius: 50%;
  --fb-ic-border: 1.5px solid #dbe0e6;
  --fb-ic-shadow: 0 2px 8px rgba(20, 35, 50, 0.10);
  --fb-ic-hov-bg: #2563eb;
  --fb-ic-hov-color: #ffffff;
  --fb-ic-hov-border: 1.5px solid #2563eb;
  --fb-ic-hov-tf: scale(1.08);
  --fb-ic-hov-shadow: 0 5px 16px rgba(37, 99, 235, 0.30);
  --fb-btn-bg: rgba(255, 255, 255, 0.94);
  --fb-btn-color: #5b6672;
  --fb-btn-border: 1.5px solid #dbe0e6;
  --fb-btn-hov-bg: #2563eb;
  --fb-btn-hov-color: #ffffff;
  --fb-btn-hov-border: 1.5px solid #2563eb;
  --fb-btn-shadow: 0 2px 8px rgba(20, 35, 50, 0.10);
  --fb-close-bg: rgba(255, 255, 255, 0.94);
  --fb-close-color: #9aa4af;
  --fb-close-hov-bg: #f2f4f7;
  --fb-close-hov-color: #5b6672;
}

/* ============================================================
   皮肤 6/6：label 悬停展名
   ============================================================ */
.fb-style-label {
  --fb-bg: transparent;
  --fb-pad: 2px 0;
  --fb-radius: 0;
  --fb-border: none;
  --fb-shadow: none;
  --fb-gap: 9px;
  --fb-ic-size: 42px;
  --fb-ic-font: 18px;
  --fb-ic-bg: #ffffff;
  --fb-ic-color: #44525f;
  --fb-ic-radius: 12px;
  --fb-ic-shadow: 0 4px 14px rgba(20, 35, 50, 0.13);
  --fb-ic-hov-bg: #2563eb;
  --fb-ic-hov-color: #ffffff;
  --fb-ic-hov-shadow: 0 7px 20px rgba(37, 99, 235, 0.30);
  --fb-btn-bg: #ffffff;
  --fb-btn-color: #66717e;
  --fb-btn-shadow: 0 4px 14px rgba(20, 35, 50, 0.13);
  --fb-btn-hov-bg: #2563eb;
  --fb-btn-hov-color: #ffffff;
  --fb-close-bg: #ffffff;
  --fb-close-color: #9aa4af;
  --fb-close-hov-bg: #f2f4f7;
  --fb-close-hov-color: #5b6672;
  --fb-pop: 52px;
}
/* 名称气泡：取 title 属性，无需改 HTML */
.fb-style-label .fb-icon:not([title=""])::after {
  content: attr(title);
  position: absolute;
  top: 50%;
  background: rgba(26, 32, 40, 0.92);
  color: #fff;
  font-size: 12px;
  font-style: normal;
  line-height: 1;
  padding: 8px 11px;
  border-radius: 8px;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  box-shadow: 0 5px 16px rgba(0, 0, 0, 0.20);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
  z-index: 20;
}
.fb-bar-right.fb-style-label .fb-icon::after {
  right: calc(100% + 11px);
  transform: translateY(-50%) translateX(5px);
}
.fb-bar-left.fb-style-label .fb-icon::after {
  left: calc(100% + 11px);
  transform: translateY(-50%) translateX(-5px);
}
.fb-bar.fb-style-label .fb-icon:hover::after {
  opacity: 1;
  visibility: visible;
  transform: translateY(-50%) translateX(0);
}

/* ========== 响应式：移动端 ========== */
@media (max-width: 767px) {
  .fb-bar {
    top: auto;
    bottom: 80px;
    --fb-ic-size: 34px;
    --fb-ic-font: 15px;
  }
  .fb-bar-right { right: 8px; }
  .fb-bar-left  { left: 8px;  }
  .fb-bar .fb-back-top { font-size: 15px; }
  .fb-bar .fb-close { display: flex; font-size: 13px; margin-top: 5px; }
  .fb-style-label { --fb-ic-size: 38px; }
  .fb-style-label .fb-icon::after { display: none; }
  .fb-bar .fb-qr-popup {
    left: 50% !important;
    right: auto !important;
    top: auto;
    bottom: 45px;
    transform: translateX(-50%) scale(0.85);
    min-width: 100px;
  }
  .fb-bar .fb-qr-popup:after {
    left: 50% !important;
    right: auto !important;
    top: 100%;
    transform: translateX(-50%);
    border: 8px solid transparent;
    border-top-color: #fff;
  }
  .fb-bar .fb-icon-qr:hover .fb-qr-popup {
    transform: translateX(-50%) scale(1);
  }
}

/* ============================================================
   底部社交行（.fb-footer，普通文档流）
   中性实底设计：浅色圆底 + 深灰图标，深浅底色 footer 都清晰可见
   ============================================================ */
.fb-footer {
  margin-top: 4px;
}
.fb-footer-icons {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}
.fb-footer .fb-icon {
  width: 36px;
  height: 36px;
  display: flex !important;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: #eef0f3;
  color: #5b6472 !important;
  font-size: 16px;
  border: none;
  transition: background-color 0.25s ease, color 0.25s ease,
              transform 0.25s ease;
}
.fb-footer .fb-icon:hover {
  background: #2563eb;
  color: #ffffff !important;
  transform: translateY(-2px);
}
/* 底部社交行：微信二维码 hover 弹层（向上弹出，footer 位于页面底部） */
.fb-footer .fb-icon-qr { position: relative; }
.fb-footer .fb-qr-popup {
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) scale(0.85);
  margin-bottom: 10px;
  background: #fff;
  border: 1px solid rgba(15, 23, 42, 0.06);
  border-radius: 12px;
  padding: 12px;
  box-shadow: 0 10px 32px rgba(15, 23, 42, 0.16);
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s ease;
  z-index: 99;
  width: 140px;
  height: 140px;
  display: flex !important;
  align-items: center;
  justify-content: center;
}
.fb-footer .fb-qr-popup img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 8px;
}
.fb-footer .fb-qr-popup:after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 8px solid transparent;
  border-top-color: #fff;
}
.fb-footer .fb-icon-qr:hover .fb-qr-popup {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) scale(1);
}
@media (max-width: 767px) {
  .fb-footer-icons { gap: 10px; }
  .fb-footer .fb-icon { width: 33px; height: 33px; font-size: 14px; }
}

/* ============================================================
   文章详情分享行（.fb-share，浅色内容区背景）
   ============================================================ */
.fb-share {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 14px;
  margin: 22px 0 6px;
  padding: 14px 0 4px;
  border-top: 1px solid #eef0f3;
}
.fb-share-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: #98a1ad;
  font-weight: 600;
}
.fb-share-icons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.fb-share-btn {
  width: 36px;
  height: 36px;
  display: flex !important;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: #f2f4f7;
  color: #5b6472 !important;
  font-size: 16px;
  border: none;
  cursor: pointer;
  transition: background-color 0.25s ease, color 0.25s ease,
              transform 0.25s ease;
}
.fb-share-btn:hover {
  background: #2563eb;
  color: #ffffff !important;
  transform: translateY(-2px);
}

/* 当前页链接二维码按钮：悬停/点击弹出二维码（JS 本地生成） */
.fb-qr-btn { position: relative; }
.fb-qr-btn .fb-qr-pop {
  position: absolute;
  bottom: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  background: #fff;
  border: 1px solid rgba(15, 23, 42, 0.06);
  border-radius: 12px;
  box-shadow: 0 10px 32px rgba(15, 23, 42, 0.14);
  padding: 12px 12px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
  z-index: 30;
}
.fb-qr-btn .fb-qr-pop:after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 7px solid transparent;
  border-top-color: #fff;
}
.fb-qr-btn .fb-qr-box {
  width: 140px;
  height: 140px;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
}
.fb-qr-btn .fb-qr-box img,
.fb-qr-btn .fb-qr-box canvas {
  width: 140px !important;
  height: 140px !important;
  display: block;
}
.fb-qr-btn .fb-qr-txt {
  font-size: 12px;
  color: #98a1ad;
  line-height: 1.6;
  margin-top: 4px;
}
.fb-qr-btn:hover .fb-qr-pop,
.fb-qr-btn.fb-qr-open .fb-qr-pop {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}
@media (max-width: 767px) {
  .fb-qr-btn .fb-qr-box,
  .fb-qr-btn .fb-qr-box img,
  .fb-qr-btn .fb-qr-box canvas { width: 124px !important; height: 124px !important; }
  .fb-share { margin: 16px 0 4px; padding: 10px 0 2px; }
  .fb-share-btn { width: 33px; height: 33px; font-size: 14px; }
}

/* 复制成功轻提示（JS 动态创建） */
.fb-toast {
  position: fixed;
  left: 50%;
  bottom: 60px;
  transform: translateX(-50%) translateY(10px);
  background: rgba(17, 24, 39, 0.88);
  color: #fff;
  font-size: 14px;
  line-height: 1.4;
  padding: 10px 18px;
  border-radius: 22px;
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s;
  max-width: 82vw;
  text-align: center;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.20);
}
.fb-toast.fb-toast-show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}