/**
 * Zuoekai UI - 底部 Dock 栏样式
 * 
 * 包含 macOS 风格的鱼眼放大效果、拖拽滚动支持以及响应式适配。
 */

.zuoekai-bottom-dock {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  justify-content: center; /* 居中内容 */
  align-items: flex-end;   /* 底部对齐 */
  z-index: var(--zuoekai-z-dock, 2100);
  pointer-events: none;    /* 容器本身不阻挡点击 */
  width: auto;
  max-width: 90vw;
  transition:
    transform var(--zuoekai-motion-duration-normal) var(--zuoekai-motion-ease-out),
    filter var(--zuoekai-motion-duration-normal) var(--zuoekai-motion-ease-out);
}

.zuoekai-bottom-dock--interactive {
  transform: translateX(-50%) translateY(-4px);
  filter: drop-shadow(0 10px 22px rgba(79, 70, 229, 0.18));
}

/* 独立的背景层 - 承载视觉样式 */
.zuoekai-bottom-dock__bg {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 68px; /* 调整为与侧边栏宽度一致 */
  
  border-radius: var(--zuoekai-radius-xl);
  border: 1px solid var(--zuoekai-color-border);
  background: var(--zuoekai-color-surface-float);
  box-shadow: var(--zuoekai-shadow-lg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  
  z-index: -1; /* 位于 Rail 下层 */
  pointer-events: auto; /* 背景可接受点击 */
  transition:
    opacity var(--zuoekai-motion-duration-normal) var(--zuoekai-motion-ease-out),
    transform var(--zuoekai-motion-duration-normal) var(--zuoekai-motion-ease-out),
    visibility var(--zuoekai-motion-duration-normal) var(--zuoekai-motion-ease-out),
    width 0.2s ease,
    background var(--zuoekai-motion-duration-normal) var(--zuoekai-motion-ease-out),
    border-color var(--zuoekai-motion-duration-normal) var(--zuoekai-motion-ease-out),
    box-shadow var(--zuoekai-motion-duration-normal) var(--zuoekai-motion-ease-out);
}

.zuoekai-bottom-dock--interactive .zuoekai-bottom-dock__bg {
  border-color: color-mix(in srgb, var(--zuoekai-color-brand-500) 26%, var(--zuoekai-color-border));
  background: color-mix(in srgb, var(--zuoekai-color-surface-float) 88%, white 12%);
  box-shadow: 0 14px 34px rgba(79, 70, 229, 0.20);
}

/* 滚动容器 - 承载交互和布局 */
.zuoekai-bottom-dock__rail {
  display: flex;
  flex-direction: row;
  align-items: flex-end; /* 底部对齐，确保图标向上放大 */
  gap: 10px; /* 调整为与侧边栏一致 */
  padding: 0 16px 10px 16px; /* 底部留白10px，使48px图标居中于68px背景 (68-48)/2=10 */
  height: 100px; /* 高度足够容纳放大后的图标 (48 * 1.55 ≈ 75px) */
  
  /* 内容溢出时允许滚动 */
  overflow-x: auto;
  
  /* 隐藏滚动条 (IE, Edge, Firefox) */
  -ms-overflow-style: none;
  scrollbar-width: none;

  /* 移除视觉样式，由 bg 承担 */
  background: transparent;
  
  pointer-events: auto;
  transition: width 0.2s ease;
  
  /* 启用抓手光标 */
  cursor: grab;
  
  /* 拖拽期间防止文本被选中 */
  user-select: none;
  -webkit-user-select: none;
  transition:
    width 0.2s ease,
    opacity var(--zuoekai-motion-duration-normal) var(--zuoekai-motion-ease-out),
    transform var(--zuoekai-motion-duration-normal) var(--zuoekai-motion-ease-out),
    visibility var(--zuoekai-motion-duration-normal) var(--zuoekai-motion-ease-out);
}

.zuoekai-bottom-dock--interactive .zuoekai-bottom-dock__rail {
  transform: translateY(-2px);
}

/* 隐藏滚动条 (Chrome/Safari/Opera) */
.zuoekai-bottom-dock__rail::-webkit-scrollbar {
  display: none;
}

.zuoekai-bottom-dock__rail:active {
  cursor: grabbing;
}

.zuoekai-bottom-dock__brand {
  font-weight: 800;
  font-size: 14px; /* 调小字号 */
  color: var(--zuoekai-color-text);
  margin-right: 8px;
  padding: 0 8px;
  letter-spacing: 1px;
  user-select: none;
  white-space: nowrap;
  /* 垂直居中计算：
     背景高 68px (中心 34px)
     Rail padding-bottom 10px
     Brand 高 ~20px (中心 10px)
     Target Bottom = 34 - 10 = 24px
     Margin Bottom = 24 - 10 = 14px
  */
  margin-bottom: 14px; 
}

.zuoekai-bottom-dock__item {
  width: 48px;  /* 调整为与侧边栏一致 */
  height: 48px;
  border: 0;
  padding: 0;
  border-radius: 14px; /* 调整为与侧边栏一致 */
  background: transparent;
  color: var(--zuoekai-color-text-secondary);
  cursor: pointer;
  
  display: flex;
  align-items: center;
  justify-content: center;
  
  transform-origin: center bottom; /* 关键：从底部向上缩放 */
  will-change: transform;
  
  transition: 
    transform 0.1s ease-out,
    background var(--zuoekai-motion-duration-fast) var(--zuoekai-motion-ease-out),
    color var(--zuoekai-motion-duration-fast) var(--zuoekai-motion-ease-out),
    box-shadow var(--zuoekai-motion-duration-fast) var(--zuoekai-motion-ease-out);
    
  flex-shrink: 0;
  
  position: relative; /* Support for Badge */
}

.zuoekai-bottom-dock__item svg {
  width: 24px;
  height: 24px;
  stroke: url(#zuoekai-gradient-primary);
  transition: width 0.1s ease-out, height 0.1s ease-out;
  pointer-events: none;
}

/* Dock Badge (Reused style concept) */
.zuoekai-dock-badge {
  position: absolute;
  top: 4px;
  right: 4px;
  min-width: 16px;
  height: 16px;
  padding: 0 4px;
  border-radius: 8px;
  background-color: var(--zuoekai-color-error-600);
  color: white;
  font-size: 10px;
  font-weight: 700;
  line-height: 16px;
  text-align: center;
  box-shadow: 0 0 0 2px var(--zuoekai-color-surface-float);
  z-index: 10;
  pointer-events: none;
  /* Badge does not scale with parent transform if we counter it? 
     No, parent uses transform: scale(). Child will scale. 
     This is usually desired for fish-eye effect. */
}

.zuoekai-dock-badge--dot {
  width: 8px;
  height: 8px;
  min-width: 0;
  padding: 0;
  top: 10px;
  right: 10px;
}

.zuoekai-bottom-dock__item:hover {
  background: var(--zuoekai-color-action-hover-bg);
  color: var(--zuoekai-color-text);
}

.zuoekai-bottom-dock__item--active {
  color: var(--zuoekai-color-text-inverse);
  background: linear-gradient(135deg, var(--zuoekai-color-theme-gradient-start), var(--zuoekai-color-theme-gradient-end));
  box-shadow: var(--zuoekai-shadow-brand-glow);
  border-color: transparent;
}

.zuoekai-bottom-dock__item--active svg {
  stroke: var(--zuoekai-color-text-inverse);
}

.zuoekai-bottom-dock__divider {
  width: 1px;
  height: 24px; /* 调小 */
  background: var(--zuoekai-color-border);
  opacity: 0.8;
  margin: 0 8px;
  /* 垂直居中计算：
     Target Bottom = 34 - 12 = 22px
     Margin Bottom = 22 - 10 = 12px
  */
  margin-bottom: 12px;
}

/* --- 全局悬浮标签 (Tooltip) --- */
.zuoekai-bottom-dock__label {
  position: fixed;
  left: 0;
  top: 0;
  z-index: var(--zuoekai-z-tooltip); /* 确保在最上层，高于 modal */
  
  padding: 6px 10px;
  border-radius: var(--zuoekai-radius-sm);
  border: 1px solid var(--zuoekai-color-border);
  background: var(--zuoekai-color-surface-float);
  box-shadow: var(--zuoekai-shadow-md);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  
  font-size: 12px;
  font-weight: 600;
  color: var(--zuoekai-color-text);
  white-space: nowrap;
  
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  
  /* 初始偏移，用于动画 */
  transform: translate(-50%, -100%) scale(0.9);
  
  transition: 
    opacity var(--zuoekai-motion-duration-fast) var(--zuoekai-motion-ease-out),
    visibility var(--zuoekai-motion-duration-fast) var(--zuoekai-motion-ease-out),
    transform var(--zuoekai-motion-duration-fast) var(--zuoekai-motion-ease-out);
}

.zuoekai-bottom-dock__label--visible {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, -100%) scale(1);
}

/* --- 响应式适配 (移动端) --- */
@media (max-width: 768px) {
  .zuoekai-bottom-dock {
    bottom: 16px;
    width: 95%;
    max-width: 100%;
  }
  
  /* 移动端背景层调整 */
  .zuoekai-bottom-dock__bg {
    height: 64px;
    border-radius: 24px;
  }
  
  .zuoekai-bottom-dock__rail {
    width: 100%;
    /* 移动端左对齐，便于长列表滚动 */
    justify-content: flex-start; 
    padding: 0 12px;
    height: 64px; /* 移动端高度减小 */
    align-items: center; /* 移动端垂直居中 */
    border-radius: 24px;
    gap: 8px;
  }
  
  .zuoekai-bottom-dock__brand {
    font-size: 14px;
    margin-right: 2px;
    padding: 0 6px;
    margin-bottom: 0; /* 重置桌面端的底部对齐偏移 */
  }
  
  .zuoekai-bottom-dock__divider {
    height: 24px;
    margin-bottom: 0; /* 重置桌面端的底部对齐偏移 */
  }
  
  .zuoekai-bottom-dock__item {
    width: 40px;
    height: 40px;
    border-radius: 50%; /* 移动端圆形图标 */
    /* 移动端禁用 transform 缩放效果 */
    transform: none !important; 
  }
}

/* ==========================================================================
   Toggle Button (折叠/展开切换)
   ========================================================================== */
.zuoekai-bottom-dock__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  
  background: var(--zuoekai-color-surface-float);
  border: 1px solid var(--zuoekai-color-border);
  box-shadow: var(--zuoekai-shadow-lg);
  color: var(--zuoekai-color-text);
  
  cursor: pointer;
  pointer-events: none;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) scale(0); /* 默认隐藏 (缩放为0) */
  opacity: 0;
  z-index: 2100; /* 提升层级，高于 Popover (2000) */
  
  transition: 
    transform var(--zuoekai-motion-duration-normal) var(--zuoekai-motion-ease-out),
    opacity var(--zuoekai-motion-duration-normal) var(--zuoekai-motion-ease-out),
    background var(--zuoekai-motion-duration-fast) var(--zuoekai-motion-ease-out),
    border-color var(--zuoekai-motion-duration-fast) var(--zuoekai-motion-ease-out),
    box-shadow var(--zuoekai-motion-duration-fast) var(--zuoekai-motion-ease-out),
    filter var(--zuoekai-motion-duration-fast) var(--zuoekai-motion-ease-out);
}

@media (max-width: 768px) {
  .zuoekai-bottom-dock__toggle {
    bottom: 16px;
  }
}

.zuoekai-bottom-dock__toggle:hover {
  background: var(--zuoekai-color-surface-panel);
  transform: translateX(-50%) scale(1.1);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.zuoekai-bottom-dock__toggle--interactive {
  transform: translateX(-50%) scale(1.08);
  border-color: color-mix(in srgb, var(--zuoekai-color-brand-500) 35%, var(--zuoekai-color-border));
  box-shadow: 0 12px 26px rgba(79, 70, 229, 0.22);
}

.zuoekai-bottom-dock__toggle svg {
  width: 24px;
  height: 24px;
}

/* ==========================================================================
   Collapsed State (折叠状态)
   ========================================================================== */
.zuoekai-bottom-dock--collapsed {
  pointer-events: none;
}

/* 隐藏 Rail 和 BG */
.zuoekai-bottom-dock--collapsed .zuoekai-bottom-dock__rail,
.zuoekai-bottom-dock--collapsed .zuoekai-bottom-dock__bg {
  opacity: 0;
  transform: translateY(20px) scale(0.9);
  pointer-events: none;
  visibility: hidden;
}

/* 显示 Toggle — 收缩态使用主题渐变背景 + 白色图标 */
.zuoekai-bottom-dock__toggle--visible {
  transform: translateX(-50%) scale(1);
  opacity: 1;
  pointer-events: auto;
  background: var(--zuoekai-gradient-primary);
  border-color: transparent;
  color: #fff;
  box-shadow: var(--zuoekai-primary-shadow, 0 4px 15px rgba(118, 75, 162, 0.3));
}

.zuoekai-bottom-dock__toggle--visible.zuoekai-bottom-dock__toggle--interactive {
  transform: translateX(-50%) scale(1.12);
  filter: brightness(1.05);
  box-shadow: var(--zuoekai-primary-shadow-hover, 0 8px 24px rgba(118, 75, 162, 0.42));
}

/* 收缩态 Toggle hover — 渐变加亮 + 阴影增强 */
.zuoekai-bottom-dock__toggle--visible:hover {
  background: var(--zuoekai-gradient-primary);
  border-color: transparent;
  color: #fff;
  filter: brightness(1.1);
  box-shadow: var(--zuoekai-primary-shadow-hover, 0 6px 20px rgba(118, 75, 162, 0.4));
}