/* 文章内容中的图片悬浮效果 */
.post-content img {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border-radius: 4px;
}

.post-content img:hover {
  transform: scale(1.03);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  cursor: pointer;
}

/* =========================================================
   图片查看器
   背景:暗色模式 = 透明黑 / 亮色模式 = 模糊透明白
   ========================================================= */
.image-viewer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 9999;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
  overflow: hidden;
  /* 亮色模式:模糊透明白 */
  background: rgba(255, 255, 255, 0.55);
  -webkit-backdrop-filter: blur(24px);
  backdrop-filter: blur(24px);
}

body.dark-mode .image-viewer {
  /* 暗色模式:透明黑 */
  background: rgba(0, 0, 0, 0.88);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.image-viewer.active {
  opacity: 1;
  visibility: visible;
}

/* =========================================================
   舞台(承载滑动切换动画)
   ========================================================= */
.viewer-stage {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 10000;
}

.view-image {
  max-width: 92%;
  max-height: 100%;
  object-fit: contain;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  transform-origin: center center;
}

body.dark-mode .view-image {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
}

/* 手机端:上下留空白(用于点击退出),图片等比铺满剩余空间 */
.image-viewer.mobile .view-image {
  max-width: 100%;
  max-height: calc(100% - 150px);
}

/* =========================================================
   两侧半透明预览图(peek 模式)
   ========================================================= */
.viewer-peek {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 130px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10002;
  transition: opacity 0.35s ease, background 0.35s ease;
  overflow: hidden;
}

.viewer-peek.prev {
  left: 0;
  background: linear-gradient(to right, rgba(0, 0, 0, 0.08), transparent);
}

.viewer-peek.next {
  right: 0;
  background: linear-gradient(to left, rgba(0, 0, 0, 0.08), transparent);
}

.viewer-peek img {
  width: 110px;
  height: auto;
  max-height: 62vh;
  object-fit: contain;
  opacity: 0.35; /* 降低阿尔法值 */
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
  transition: opacity 0.35s cubic-bezier(0.22, 0.61, 0.36, 1),
    transform 0.35s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.viewer-peek:hover img {
  opacity: 0.9;
  transform: scale(1.04);
}

/* 按钮模式下隐藏 peek;peek 模式下隐藏按钮 */
.image-viewer.mode-buttons .viewer-peek {
  display: none !important;
}

.image-viewer.mode-peek .nav-btn {
  display: none !important;
}

/* =========================================================
   上一张/下一张按钮(buttons 模式)
   ========================================================= */
.nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0, 0, 0, 0.5);
  -webkit-backdrop-filter: blur(5px);
  backdrop-filter: blur(5px);
  border: none;
  color: #ffffff;
  font-size: 30px;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  cursor: pointer;
  z-index: 10002;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
  outline: none;
}

.nav-btn:hover {
  background: rgba(0, 0, 0, 0.75);
  transform: translateY(-50%) scale(1.08);
}

.nav-btn.disabled {
  opacity: 0.25 !important;
  pointer-events: none !important;
  cursor: default !important;
}

.nav-btn.prev {
  left: 40px;
}

.nav-btn.next {
  right: 40px;
}

/* =========================================================
   工具栏(旋转/锁定/保存)—— 电脑端位于正上方,默认隐藏
   ========================================================= */
.viewer-toolbar {
  position: absolute;
  top: 0; /* 紧贴查看界面上边缘 */
  left: 50%;
  transform: translateX(-50%) translateY(-16px);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 9px 22px;
  background: rgba(255, 255, 255, 0.55);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-radius: 0 0 50px 50px; /* 上边缘贴平,下方圆角 */
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.12);
  z-index: 10004;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease, transform 0.35s ease;
}

body.dark-mode .viewer-toolbar {
  background: rgba(40, 40, 40, 0.6);
}

/* 显示状态(鼠标靠近顶部出现) */
.viewer-toolbar.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.toolbar-btn {
  position: relative;
  background: transparent;
  border: none;
  color: var(--text-color, #333);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: all 0.2s ease;
}

body.dark-mode .toolbar-btn {
  color: rgba(255, 255, 255, 0.9);
}

.toolbar-btn svg {
  width: 25px;
  height: 25px;
  fill: currentColor;
  transition: fill 0.2s ease;
}

.toolbar-btn:hover {
  background: rgba(0, 0, 0, 0.12);
  transform: scale(1.1);
}

body.dark-mode .toolbar-btn:hover {
  background: rgba(255, 255, 255, 0.18);
}

.toolbar-btn.active {
  color: var(--accent-color, #ff6b6b);
  background: rgba(0, 0, 0, 0.1);
}

/* =========================================================
   右上角关闭按钮(电脑端/手机端常驻,不随控件显隐变化)
   ========================================================= */
.viewer-close {
  position: absolute;
  top: 18px;
  right: 22px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.45);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-radius: 50%;
  color: #ffffff;
  cursor: pointer;
  z-index: 10006; /* 高于工具栏(10004)与两侧预览(10002),胶片模式下也可见 */
  transition: background 0.25s ease, transform 0.25s ease;
  -webkit-user-select: none;
  user-select: none;
  outline: none;
}

.viewer-close svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
  pointer-events: none;
}

.viewer-close:hover {
  background: rgba(0, 0, 0, 0.7);
  transform: scale(1.08);
}

body.dark-mode .viewer-close {
  background: rgba(255, 255, 255, 0.14);
}

body.dark-mode .viewer-close:hover {
  background: rgba(255, 255, 255, 0.28);
}

/* =========================================================
   底部缩略图
   ========================================================= */
.viewer-thumbs {
  position: absolute;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%);
  max-width: 86%;
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 10003;
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.4);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-radius: 16px;
  overflow-x: auto;
  scrollbar-width: none;
}

body.dark-mode .viewer-thumbs {
  background: rgba(30, 30, 30, 0.55);
}

.viewer-thumbs::-webkit-scrollbar {
  display: none;
}

/* ===== 缩略图 v2(参考 PhotoSwipe 胶片条) =====
   固定槽位 + 中心裁剪:竖长图不再变成细长条,视觉整齐;
   悬停有放大提亮阴影的动感;当前项主题色描边+微升。 */
.viewer-thumbs {
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-behavior: smooth;
  padding: 6px 10px;
  border-radius: 14px;
  scrollbar-width: none;
}

.viewer-thumbs .thumb {
  flex: 0 0 auto;
  height: 60px;
  width: 84px; /* 固定横版槽位 */
  border-radius: 10px;
  overflow: hidden;
  cursor: pointer;
  position: relative;
  border: 2px solid rgba(128, 128, 128, 0.25);
  background: rgba(0, 0, 0, 0.25);
  transition:
    border-color 0.22s ease,
    transform 0.22s cubic-bezier(0.34, 1.56, 0.64, 1),
    box-shadow 0.22s ease,
    filter 0.22s ease;
  filter: saturate(0.85) brightness(0.85);
}

.viewer-thumbs .thumb img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover; /* 竖长图中心裁剪 */
  pointer-events: none;
}

.viewer-thumbs .thumb:hover {
  transform: translateY(-4px) scale(1.08);
  filter: saturate(1.1) brightness(1.05);
  border-color: rgba(255, 255, 255, 0.6);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.45);
  z-index: 2;
}

.viewer-thumbs .thumb.active {
  border-color: var(--accent-color, #ff6b6b);
  transform: translateY(-2px) scale(1.04);
  filter: saturate(1.05) brightness(1);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.4);
}

/* 拖动滚动条时禁用子元素过渡,保证跟手 */
.viewer-thumbs.dragging .thumb {
  transition: none;
}
.viewer-thumbs.dragging {
  scroll-behavior: auto;
  cursor: grabbing;
}

/* ===== 大图拖动手感:抓手光标 ===== */
.image-viewer .viewer-stage,
.mermaid-viewer-stage,
.table-viewer-stage {
  cursor: grab;
}
.image-viewer .viewer-stage.panning,
.mermaid-viewer-stage.panning,
.table-viewer-stage.panning {
  cursor: grabbing;
}

/* =========================================================
   Tooltip(显示在按钮/导航下方)
   ========================================================= */
.toolbar-btn::after,
.nav-btn::after {
  content: attr(data-title);
  position: absolute;
  top: 125%;
  left: 50%;
  transform: translateX(-50%) scale(0.8);
  background-color: rgba(0, 0, 0, 0.8);
  color: #fff;
  padding: 5px 10px;
  border-radius: 4px;
  font-size: 13px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
  z-index: 10010;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  line-height: normal;
}

.toolbar-btn:hover::after,
.nav-btn:hover::after {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) scale(1);
  top: 115%;
}

/* 按钮交互动画 */
@keyframes spin-icon {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(180deg);
  }
}
.toolbar-btn.rotate-btn:hover svg {
  animation: spin-icon 0.4s ease-out forwards;
}

@keyframes shake-icon {
  0% { transform: rotate(0deg); }
  25% { transform: rotate(-15deg); }
  50% { transform: rotate(15deg); }
  75% { transform: rotate(-10deg); }
  100% { transform: rotate(0deg); }
}
.toolbar-btn.lock-btn:hover svg {
  animation: shake-icon 0.4s ease-in-out;
}

@keyframes bounce-icon {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}
.toolbar-btn.download-btn:hover svg {
  animation: bounce-icon 0.6s infinite ease-in-out;
}

/* =========================================================
   手机端
   ========================================================= */
@media (max-width: 768px) {
  .toolbar-btn::after,
  .nav-btn::after {
    display: none;
  }

  /* 关闭按钮:手机端略小并避开状态栏安全区 */
  .viewer-close {
    top: calc(12px + env(safe-area-inset-top, 0px));
    right: 14px;
    width: 40px;
    height: 40px;
  }

  .viewer-close svg {
    width: 20px;
    height: 20px;
  }

  /* 工具栏保持在底部(位置不变) */
  .image-viewer .viewer-toolbar,
  .image-viewer.mobile .viewer-toolbar {
    top: auto;
    bottom: 22px;
    transform: translateX(-50%);
    width: auto;
    padding: 8px 16px;
    gap: 6px;
  }

  .image-viewer.mobile .viewer-toolbar.visible,
  .image-viewer.mobile .viewer-toolbar {
    opacity: 1;
    pointer-events: auto;
  }

  /* 缩略图:工具栏上方,横向滚动 */
  .viewer-thumbs {
    bottom: 88px;
    max-width: 94%;
    gap: 8px;
    padding: 6px 10px;
  }

  .viewer-thumbs .thumb {
    height: 52px;
  }

  /* 手机端不显示上一张/下一张按钮 */
  .image-viewer.mobile .nav-btn {
    display: none !important;
  }

  /* peek 面板窄一些 */
  .viewer-peek {
    width: 64px;
  }

  .viewer-peek img {
    width: 54px;
    max-height: 40vh;
  }

  /* 单击隐藏控件(工具栏/缩略图)时的状态 */
  .image-viewer.controls-hidden .viewer-toolbar,
  .image-viewer.controls-hidden .viewer-thumbs {
    opacity: 0;
    pointer-events: none;
    transform: translateX(-50%) translateY(12px);
  }

  .image-viewer.controls-hidden .viewer-toolbar {
    transform: translateX(-50%);
  }
}

/* 胶片模式(手机端缩小手势):两侧露出前后图片 */
.image-viewer.filmstrip .viewer-stage {
  transition: transform 0.2s ease-out;
}

.image-viewer.filmstrip .viewer-peek img {
  opacity: 0.75;
  transform: scale(0.92);
}

/* 非手机端隐藏控件切换逻辑不适用 */
@media (min-width: 769px) {
  .image-viewer.controls-hidden .viewer-toolbar,
  .image-viewer.controls-hidden .viewer-thumbs {
    opacity: 1;
    pointer-events: auto;
  }

  /* 电脑端:单击图片后隐藏"切换类"控件(左右缩略图/上一张下一张按钮/底部缩略图)。
     工具栏(选择/锁定/下载)显隐独立,不受影响。再次单击图片恢复。 */
  .image-viewer.ui-hidden .viewer-peek,
  .image-viewer.ui-hidden .nav-btn,
  .image-viewer.ui-hidden .viewer-thumbs {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
  }

  .image-viewer.ui-hidden .nav-btn.prev {
    transform: translateY(-50%) translateX(-10px);
  }

  .image-viewer.ui-hidden .nav-btn.next {
    transform: translateY(-50%) translateX(10px);
  }
}