/* =========================================================
   返回顶部（Pro 最终版）
   - 一次点击即生效（配合 JS）
   - Hover 优化（仅桌面设备触发）
   - 箭头不再因 hover 变浅而“消失”
   - 夜间发光 + 呼吸动画
   - 进度环指示
   - 主题切换柔和过渡
   ========================================================= */

:root {
  --zob-size: 56px;
  --zob-primary: var(--bs-primary, #0d6efd);
  --zob-on-primary: #fff;
  --zob-dark-bg: rgba(35,40,45,.65);
  --zob-light-bg: rgba(255,255,255,.68);
  --zob-blur: 8px;
  --zob-border: rgba(0,0,0,.08);
  --zob-dark-border: rgba(255,255,255,.10);
  --zob-glow-rgb: 0,153,255;   /* 夜间发光主色 (RGB) */
  --zob-ring-w: 3;             /* 进度环粗细 */
  /* 新增：图标独立颜色，避免跟随 currentColor 变浅 */
  --zob-icon-color: var(--zob-primary);
}

#zobBackToTop {
  position: fixed;
  inset-inline-end: 1.25rem;   /* RTL 友好 */
  bottom: calc(10.25rem + (var(--zob-action-index, 0) * (var(--zob-size) + .65rem)));
  width: var(--zob-size);
  height: var(--zob-size);
  border-radius: 999px;
  border: 1px solid var(--zob-border);
  display: flex;
  align-items: center;
  justify-content: center;
  isolation: isolate;
  backdrop-filter: blur(var(--zob-blur));
  -webkit-backdrop-filter: blur(var(--zob-blur));
  opacity: 0;
  transform: translateY(10px) scale(.98);
  pointer-events: none;
  touch-action: manipulation;           /* ? 修复移动端点击延迟/二次点击 */
  -webkit-tap-highlight-color: transparent;
  transition:
    background-color .45s ease,
    color .45s ease,
    box-shadow .5s ease,
    border-color .45s ease,
    opacity .25s ease,
    transform .25s ease,
    filter .5s ease;
  z-index: 1080;
}

#zobBackToTop.show {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;                 /* ? 出现后立即可点 */
}

/* 子元素不抢事件：避免二次点击 */
#zobBackToTop .zob-icon,
#zobBackToTop .zob-ring,
#zobBackToTop .zob-ring * { pointer-events: none; }

/* 图标独立颜色（不随按钮 color 改变） */
#zobBackToTop .zob-icon {
  width: 20px; height: 20px;
  position: absolute;
  z-index: 3;                           /* 始终在进度环之上 */
  color: var(--zob-icon-color);
}

/* 进度环（SVG 两个圆） */
#zobBackToTop .zob-ring {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  z-index: 1;
}
#zobBackToTop .zob-ring-bg,
#zobBackToTop .zob-ring-fg {
  fill: none; stroke-linecap: round;
  transform: rotate(-90deg);
  transform-origin: 50% 50%;
}
#zobBackToTop .zob-ring-bg { stroke: rgba(0,0,0,.10); stroke-width: var(--zob-ring-w); }
#zobBackToTop .zob-ring-fg {
  stroke: var(--zob-primary);
  stroke-width: var(--zob-ring-w);
  stroke-dasharray: 138.23;  /* 2πr, r=22 */
  stroke-dashoffset: 138.23;
  transition:
    stroke .45s ease,
    stroke-dashoffset .12s linear;
  will-change: stroke-dashoffset;
}

/* -------- 浅色 -------- */
[data-bs-theme="light"] #zobBackToTop,
html:not([data-bs-theme]) #zobBackToTop {
  background: var(--zob-light-bg);
  color: var(--zob-primary);
  border-color: rgba(0,0,0,.08);
  box-shadow: 0 6px 18px color-mix(in srgb, var(--zob-primary) 22%, transparent);
  /* 图标保持主色，避免 hover 时“消失” */
  --zob-icon-color: var(--zob-primary);
}

/* ? 只在支持 hover 的设备上启用 hover（桌面端），移动端不触发 */
@media (hover: hover) and (pointer: fine) {
  [data-bs-theme="light"] #zobBackToTop:hover,
  html:not([data-bs-theme]) #zobBackToTop:hover {
    background: color-mix(in srgb, var(--zob-primary) 14%, #ffffff);
    border-color: color-mix(in srgb, var(--zob-primary) 25%, transparent);
    transform: translateY(-3px);
    box-shadow:
      0 10px 26px color-mix(in srgb, var(--zob-primary) 40%, transparent);
    /* 图标仍保持主色，保证对比度 */
    --zob-icon-color: var(--zob-primary);
  }
}

/* -------- 夜间（发光 + 呼吸） -------- */
[data-bs-theme="dark"] #zobBackToTop {
  background: var(--zob-dark-bg);
  color: color-mix(in srgb, rgb(var(--zob-glow-rgb)) 64%, #ffffff);
  border-color: var(--zob-dark-border);
  box-shadow: 0 0 12px rgba(var(--zob-glow-rgb), .25);
  animation: zobPulse 3s ease-in-out infinite;
  /* 夜间默认图标：冷蓝混白（高对比） */
  --zob-icon-color: color-mix(in srgb, rgb(var(--zob-glow-rgb)) 64%, #ffffff);
}
[data-bs-theme="dark"] #zobBackToTop .zob-ring-bg { stroke: rgba(255,255,255,.12); }
[data-bs-theme="dark"] #zobBackToTop .zob-ring-fg { stroke: rgb(var(--zob-glow-rgb)); }

@media (hover: hover) and (pointer: fine) {
  [data-bs-theme="dark"] #zobBackToTop:hover {
    background: color-mix(in srgb, rgb(22,29,37) 65%, rgb(var(--zob-glow-rgb)));
    border-color: transparent;
    transform: translateY(-3px);
    box-shadow:
      0 0 20px rgba(var(--zob-glow-rgb), .55),
      0 0 40px rgba(var(--zob-glow-rgb), .28);
    animation: none;                     /* 悬停时停止呼吸，直亮 */
    /* 夜间 hover：图标切为纯白，进一步提高对比 */
    --zob-icon-color: #fff;
  }
}

/* 夜间呼吸动画（轻微，不刺眼） */
@keyframes zobPulse {
  0%, 100% {
    box-shadow:
      0 0 8px rgba(var(--zob-glow-rgb), .25),
      0 0 18px rgba(var(--zob-glow-rgb), .15);
    filter: brightness(1);
  }
  50% {
    box-shadow:
      0 0 14px rgba(var(--zob-glow-rgb), .45),
      0 0 32px rgba(var(--zob-glow-rgb), .25);
    filter: brightness(1.10);
  }
}

/* 无 data-bs-theme 时跟随系统深色 */
@media (prefers-color-scheme: dark) {
  html:not([data-bs-theme]) #zobBackToTop {
    background: var(--zob-dark-bg);
    color: color-mix(in srgb, rgb(var(--zob-glow-rgb)) 64%, #ffffff);
    border-color: var(--zob-dark-border);
    box-shadow: 0 0 12px rgba(var(--zob-glow-rgb), .25);
    animation: zobPulse 3s ease-in-out infinite;
    --zob-icon-color: color-mix(in srgb, rgb(var(--zob-glow-rgb)) 64%, #ffffff);
  }
  html:not([data-bs-theme]) #zobBackToTop .zob-ring-bg { stroke: rgba(255,255,255,.12); }
  html:not([data-bs-theme]) #zobBackToTop .zob-ring-fg { stroke: rgb(var(--zob-glow-rgb)); }
}

/* 交互反馈（移动端主要使用 :active） */
#zobBackToTop:active { transform: scale(.96); }

/* 焦点可见性（无障碍） */
#zobBackToTop:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--zob-primary) 55%, #0dcaf0);
  outline-offset: 3px;
}

/* 主题切换时的柔和过渡 */
:root, [data-bs-theme="light"], [data-bs-theme="dark"] {
  transition:
    background-color .5s ease,
    color .5s ease,
    border-color .5s ease,
    box-shadow .5s ease,
    filter .5s ease;
}

/* 小屏优化 */
@media (max-width: 576px) {
  :root { --zob-size: 48px; }
  #zobBackToTop { bottom: calc(10rem + (var(--zob-action-index, 0) * (var(--zob-size) + .55rem))); inset-inline-end: .75rem; }
}

/* 无障碍：减少动画 */
@media (prefers-reduced-motion: reduce) {
  #zobBackToTop { transition: none; animation: none !important; }
  #zobBackToTop:hover { transform: none; }
  #zobBackToTop .zob-ring-fg {
    transition: none;
    will-change: auto;
  }
}

/* =========================================================
   Floating contact actions and international contact center
   ========================================================= */
.zob-floating-actions {
  position: static;
}

.zob-action-index-0 { --zob-action-index: 0; }
.zob-action-index-1 { --zob-action-index: 1; }
.zob-action-index-2 { --zob-action-index: 2; }

.zob-floating-action.zob-contact-action {
  position: fixed;
  inset-inline-end: 1.25rem;
  bottom: calc(10.25rem + (var(--zob-action-index, 0) * (var(--zob-size) + .65rem)));
  width: var(--zob-size);
  height: var(--zob-size);
  padding: 0;
  border: 1px solid var(--zob-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--zob-primary);
  background: var(--zob-light-bg);
  box-shadow: 0 6px 18px color-mix(in srgb, var(--zob-primary) 22%, transparent);
  backdrop-filter: blur(var(--zob-blur));
  -webkit-backdrop-filter: blur(var(--zob-blur));
  text-decoration: none;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: transform .25s ease, background-color .45s ease, color .45s ease, box-shadow .45s ease, border-color .45s ease;
  z-index: 1080;
}

.zob-floating-action .zob-contact-icon {
  width: 23px;
  height: 23px;
  pointer-events: none;
}

[data-bs-theme="dark"] .zob-floating-action.zob-contact-action {
  color: color-mix(in srgb, rgb(var(--zob-glow-rgb)) 72%, #fff);
  background: var(--zob-dark-bg);
  border-color: var(--zob-dark-border);
  box-shadow: 0 0 12px rgba(var(--zob-glow-rgb), .25);
}

@media (prefers-color-scheme: dark) {
  html:not([data-bs-theme]) .zob-floating-action.zob-contact-action {
    color: color-mix(in srgb, rgb(var(--zob-glow-rgb)) 72%, #fff);
    background: var(--zob-dark-bg);
    border-color: var(--zob-dark-border);
    box-shadow: 0 0 12px rgba(var(--zob-glow-rgb), .25);
  }
}

@media (hover: hover) and (pointer: fine) {
  .zob-floating-action.zob-contact-action:hover {
    color: var(--zob-primary);
    background: color-mix(in srgb, var(--zob-primary) 14%, #fff);
    border-color: color-mix(in srgb, var(--zob-primary) 25%, transparent);
    box-shadow: 0 10px 26px color-mix(in srgb, var(--zob-primary) 40%, transparent);
    transform: translateY(-3px);
  }
  [data-bs-theme="dark"] .zob-floating-action.zob-contact-action:hover {
    color: #fff;
    background: color-mix(in srgb, rgb(22,29,37) 65%, rgb(var(--zob-glow-rgb)));
    border-color: transparent;
    box-shadow: 0 0 20px rgba(var(--zob-glow-rgb), .55), 0 0 40px rgba(var(--zob-glow-rgb), .28);
  }
}

.zob-floating-action.zob-contact-action:active { transform: scale(.96); }
.zob-floating-action.zob-contact-action:focus-visible,
.zob-contact-dialog-close:focus-visible,
.zob-contact-dialog-link:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--zob-primary) 55%, #0dcaf0);
  outline-offset: 3px;
}

.zob-contact-dialog[hidden] { display: none !important; }

/* 无原生 inert 时，由联系中心脚本临时阻止背景区域的指针与触摸交互。 */
.zob-contact-isolated-fallback {
  pointer-events: none !important;
  user-select: none !important;
  touch-action: none !important;
}
.zob-contact-dialog {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 1rem;
  z-index: 1095;
}
.zob-contact-dialog-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.58);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
}
.zob-contact-dialog-panel {
  position: relative;
  width: min(92vw, 360px);
  padding: 1.4rem;
  border: 1px solid var(--zob-border);
  border-radius: 1rem;
  background: var(--bs-body-bg, #fff);
  color: var(--bs-body-color, #212529);
  box-shadow: 0 1.25rem 3.5rem rgba(0,0,0,.28);
  text-align: center;
}
.zob-contact-dialog-close {
  position: absolute;
  inset-block-start: .45rem;
  inset-inline-end: .55rem;
  width: 2.25rem;
  height: 2.25rem;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: currentColor;
  font-size: 1.75rem;
  line-height: 1;
}
.zob-contact-dialog-title { margin: 0 2rem 1rem; font-size: 1.2rem; }
.zob-contact-dialog-qr {
  display: block;
  width: min(100%, 260px);
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  margin: 0 auto;
  border-radius: .65rem;
}
.zob-contact-dialog-note { margin: 1rem 0; }
.zob-contact-dialog-link { min-width: 9rem; }

@media (max-width: 576px) {
  .zob-floating-action.zob-contact-action {
    inset-inline-end: .75rem;
    bottom: calc(10rem + (var(--zob-action-index, 0) * (var(--zob-size) + .55rem)));
  }
}

@media (prefers-reduced-motion: reduce) {
  .zob-floating-action.zob-contact-action { transition: none; }
  .zob-floating-action.zob-contact-action:hover { transform: none; }
}
/* v1.0.40 International floating contact center fixes */
.zob-contact-center-panel{width:min(94vw,520px);text-align:start}.zob-contact-center-description{text-align:center;margin:-.35rem 0 1rem;color:var(--bs-secondary-color,#6c757d)}.zob-contact-channel-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.75rem;max-height:min(60vh,520px);overflow:auto}.zob-contact-channel{display:flex;align-items:center;gap:.75rem;width:100%;padding:.8rem;border:1px solid var(--zob-border);border-radius:.75rem;background:transparent;color:inherit;text-decoration:none;text-align:start}.zob-contact-channel:hover{background:color-mix(in srgb,var(--zob-primary) 10%,transparent);border-color:color-mix(in srgb,var(--zob-primary) 35%,transparent)}.zob-contact-channel-icon{display:grid;place-items:center;flex:0 0 2.25rem;width:2.25rem;height:2.25rem;border-radius:999px;background:color-mix(in srgb,var(--zob-primary) 14%,transparent);color:var(--zob-primary);font-size:1.15rem}.zob-contact-channel strong,.zob-contact-channel small{display:block}.zob-contact-channel small{margin-top:.15rem;color:var(--bs-secondary-color,#6c757d);overflow-wrap:anywhere}.zob-contact-qr-account{font-weight:600;margin:.85rem 0 0}@media(max-width:576px){.zob-contact-channel-grid{grid-template-columns:1fr}.zob-contact-center-panel{padding:1.15rem}}


/* v1.0.51 QR stage, loading status, stable ratio rendering, and richer fallback details */
.zob-contact-fallback {
  position: fixed;
  inset-inline-end: 1.25rem;
  bottom: calc(10.25rem + (var(--zob-action-index, 0) * (var(--zob-size) + .65rem)));
  z-index: 1080;
}
.zob-contact-fallback[hidden] { display: none !important; }
.zob-contact-fallback > summary {
  width: var(--zob-size);
  height: var(--zob-size);
  display: grid;
  place-items: center;
  overflow: hidden;
  white-space: nowrap;
  text-indent: -9999px;
  border: 1px solid var(--zob-border);
  border-radius: 999px;
  background: var(--bs-body-bg, #fff);
  color: var(--zob-primary);
  box-shadow: 0 6px 18px color-mix(in srgb, var(--zob-primary) 22%, transparent);
  cursor: pointer;
}
.zob-contact-fallback-icon {
  display: inline-block;
  text-indent: 0;
  font-size: 1.2rem;
  line-height: 1;
}
.zob-contact-fallback-panel {
  position: absolute;
  inset-inline-end: 0;
  bottom: calc(var(--zob-size) + .6rem);
  width: min(88vw, 340px);
  max-height: 65vh;
  overflow: auto;
  padding: 1rem;
  border: 1px solid var(--zob-border);
  border-radius: .85rem;
  background: var(--bs-body-bg, #fff);
  color: var(--bs-body-color, #212529);
  box-shadow: 0 1rem 2.5rem rgba(0,0,0,.24);
}
.zob-contact-fallback-panel ul { list-style: none; padding: 0; margin: .75rem 0 0; }
.zob-contact-fallback-panel li { padding: .55rem 0; border-top: 1px solid var(--zob-border); }
.zob-contact-fallback-panel small { display: block; color: var(--bs-secondary-color, #6c757d); }
.zob-contact-fallback-hint { margin-top: .2rem; }
.zob-contact-fallback-qr-link { display: inline-block; margin-top: .45rem; font-size: .875rem; }
.zob-contact-qr-stage {
  width: min(100%, 260px);
  aspect-ratio: 1 / 1;
  margin: .85rem auto 0;
  display: grid;
  place-items: center;
  overflow: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable both-edges;
}
.zob-contact-qr-stage > * { grid-area: 1 / 1; }
.zob-contact-dialog-qr { width: 100%; height: 100%; object-fit: contain; }
.zob-contact-qr-loading,
.zob-contact-qr-error {
  max-width: 100%;
  padding: 1rem;
  overflow-wrap: anywhere;
  word-break: normal;
  text-align: center;
  line-height: 1.5;
  hyphens: auto;
}
.zob-contact-qr-loading { color: var(--bs-secondary-color, #6c757d); }
.zob-contact-qr-error { margin: 0; color: var(--bs-danger, #dc3545); }
@media (max-width: 576px) {
  .zob-contact-fallback { inset-inline-end: .75rem; bottom: calc(10rem + (var(--zob-action-index, 0) * (var(--zob-size) + .55rem))); }
}