/**
 * 双语博客显示模式 CSS
 * 方案1：使用 <br> 标签还原空行，继承 line-height
 * 完全匹配官网的换行间距
 */

/* ========== 固定挂载点 ========== */
#bilingualControlMount {
  min-height: 0;
}

#bilingualControlMount:empty {
  display: none;
}

/* ========== 桌面端：下拉选择器 ========== */
.language-selector {
  position: relative;
  min-width: 160px;
}

.selector-button {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: white;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  font-size: 14px;
  color: #374151;
  cursor: pointer;
  transition: all 0.2s;
  width: 100%;
  justify-content: space-between;
}

.selector-button:hover {
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.selector-button.open {
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.selector-arrow {
  width: 14px;
  height: 14px;
  color: #9ca3af;
  transition: transform 0.2s;
}

.selector-button.open .selector-arrow {
  transform: rotate(180deg);
}

/* 下拉菜单 */
.dropdown-menu {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 6px;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  z-index: 50;
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: all 0.15s ease-out;
}

.language-selector.open .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  padding: 10px 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #374151;
  font-size: 14px;
  transition: background 0.1s;
}

.dropdown-item:hover {
  background: #f9fafb;
}

.dropdown-item.selected {
  background: #eff6ff;
  color: #3b82f6;
  font-weight: 500;
}

.check-icon {
  width: 14px;
  height: 14px;
  color: #3b82f6;
}

/* ========== 博客内容样式（匹配官网） ========== */

/* 基础样式 - 完全匹配官网 */
.blog-content-official {
  font-size: 14px;           /* 官网字体大小 */
  line-height: 1.75;          /* 官网行高 */
  color: #333;
  letter-spacing: 0.02em;
  max-width: none;
}

/* br标签样式 - 关键：继承行高 */
.blog-content-official br {
  display: block;
  content: "";
  margin: 0;
  padding: 0;
  height: 0;
  line-height: inherit;       /* 🎯 继承 1.75，自动匹配官网 */
}

/* 段落基础样式 */
.blog-content-official p {
  margin: 0;
  padding: 0;
  line-height: 1.75;
}

/* ========== 双语段落样式 ========== */

.blog-content-official p[lang] {
  line-height: 1.75;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

/* 日文原文样式 */
.blog-content-official p[lang="ja"] {
  color: #6c757d;
  font-size: 14px;
  font-style: italic;
  margin-bottom: 0;  /* 移除底部间距，让原文和译文紧贴 */
}

/* 中文译文样式 */
.blog-content-official p[lang="zh"] {
  color: #212529;
  font-size: 14px;
  font-weight: 450;
  margin-bottom: 0;  /* 段落间距由<br>标签控制 */
}

/* 图片样式 */
.blog-content-official img {
  max-width: 100%;
  height: auto;
  border-radius: 0;
  margin: 1em 0;
  box-shadow: none;
  display: block;
}

/* ========== 显示模式控制 ========== */

/* 仅中文模式：隐藏日文 */
.blog-content-official.mode-chinese p[lang="ja"] {
  display: none;
}

/* 仅日文模式：隐藏中文 */
.blog-content-official.mode-japanese p[lang="zh"] {
  display: none;
}

/* 仅日文模式：调整日文样式为主要内容 */
.blog-content-official.mode-japanese p[lang="ja"] {
  color: #212529;
  font-style: normal;
  font-weight: 450;
}

/* ========== 平滑过渡效果 ========== */

.blog-content-official.mode-chinese p[lang="ja"],
.blog-content-official.mode-japanese p[lang="zh"] {
  opacity: 0;
  transform: translateX(-10px);
  height: 0;
  overflow: hidden;
  margin: 0;
  padding: 0;
}

/* ========== 移动端：悬浮按钮（FAB）========== */

/* 悬浮按钮容器 - 主按钮在下，选项向上展开 */
.fab-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: flex;
  flex-direction: column;  /* 从上往下排列：选项在上，主按钮在下 */
  align-items: flex-end;
  gap: 12px;
  z-index: 1000;
}

/* 主按钮 */
.fab-main {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  color: white;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.fab-main:hover {
  transform: scale(1.1);
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.5);
}

.fab-main:active {
  transform: scale(0.95);
}

.fab-main.open {
  transform: rotate(135deg);
}

.fab-main svg {
  width: 20px;
  height: 20px;
}

/* 次要按钮 - 从下往上展开动画 */
.fab-action {
  display: flex;
  align-items: center;
  gap: 10px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(60px) scale(0.8);  /* 从主按钮下方60px开始 */
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.fab-container.open .fab-action {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);  /* 向上移动到正常位置 */
}

/* 从下往上的渐进式延迟 - 越靠近主按钮的越先出现 */
.fab-container.open .fab-action:nth-child(3) {
  transition-delay: 0s;  /* 最下方的选项（日文）最先出现 */
}

.fab-container.open .fab-action:nth-child(2) {
  transition-delay: 0.05s;  /* 中间的选项（中文）*/
}

.fab-container.open .fab-action:nth-child(1) {
  transition-delay: 0.1s;  /* 最上方的选项（双语）最后出现 */
}

.fab-label {
  background: rgba(0, 0, 0, 0.75);
  color: white;
  padding: 5px 10px;
  border-radius: 4px;
  font-size: 12px;
  white-space: nowrap;
  backdrop-filter: blur(8px);
}

.fab-button {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: white;
  border: 1px solid #e5e7eb;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: all 0.2s;
}

.fab-button:hover {
  transform: scale(1.1);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  border-color: #3b82f6;
}

.fab-button svg {
  width: 18px;
  height: 18px;
  color: #374151;
}

/* 遮罩层 */
.fab-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.2);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
  z-index: 999;
  backdrop-filter: blur(2px);
}

.fab-overlay.show {
  opacity: 1;
  visibility: visible;
}

@media (max-width: 768px) {
  /* 隐藏桌面端语言选择器 */
  .language-selector {
    display: none;
  }
  
  /* 显示悬浮按钮 */
  .fab-container {
    display: flex;
  }
  
  .blog-content-official {
    font-size: 14px;
    padding: 16px;
  }
}

@media (min-width: 769px) {
  /* 桌面端隐藏悬浮按钮 */
  .fab-container {
    display: none;
  }
}

/* ========== 暗色主题支持（使用CSS变量系统）========== */

.dark-theme .selector-button {
  background: var(--bg-tertiary);
  border-color: var(--border-color);
  color: var(--text-primary);
}

.dark-theme .selector-button:hover {
  border-color: var(--accent-primary);
}

.dark-theme .dropdown-menu {
  background: var(--bg-secondary);
  border-color: var(--border-color);
  box-shadow: var(--shadow-md);
}

.dark-theme .dropdown-item {
  color: var(--text-primary);
}

.dark-theme .dropdown-item:hover {
  background: var(--bg-tertiary);
}

.dark-theme .dropdown-item.selected {
  background: var(--bg-hover);
  color: var(--accent-primary);
}

.dark-theme .display-mode-controls {
  background: var(--bg-secondary);
  border-color: var(--border-color);
}

.dark-theme .display-mode-controls label {
  color: var(--text-primary);
}

.dark-theme .display-mode-controls button {
  background: var(--bg-tertiary);
  border-color: var(--border-color);
  color: var(--text-primary);
}

.dark-theme .display-mode-controls button:hover {
  background: var(--bg-hover);
  border-color: var(--accent-secondary);
}

.dark-theme .blog-content-official {
  color: var(--text-primary);
}

.dark-theme .blog-content-official p[lang="ja"] {
  color: var(--text-secondary);
}

.dark-theme .blog-content-official p[lang="zh"] {
  color: var(--text-primary);
}

.dark-theme .fab-main {
  background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
}

.dark-theme .fab-button {
  background: var(--bg-secondary);
  border-color: var(--border-color);
}

.dark-theme .fab-button svg {
  color: var(--text-primary);
}

/* ========== 打印样式 ========== */

@media print {
  .display-mode-controls {
    display: none !important;
  }
  
  /* 打印时默认显示中日对照 */
  .blog-content-official p[lang] {
    display: block !important;
    opacity: 1 !important;
    transform: none !important;
    height: auto !important;
  }
  
  .blog-content-official {
    font-size: 12pt;
  }
}

/* ========== 无障碍支持 ========== */

.blog-content-official p[lang="ja"]:lang(ja) {
  quotes: "「" "」" "『" "』";
}

.blog-content-official p[lang="zh"]:lang(zh) {
  quotes: """ """ "'" "'";
}

/* 焦点可见性 */
.display-mode-controls button:focus-visible {
  outline: 2px solid #8b5cf6;
  outline-offset: 2px;
}