library.css

:root {
  --bg-primary: #0d1117; --bg-secondary: #161b22; --border: #30363d;
  --text: #c9d1d9; --text-muted: #8b949e; --accent: #58a6ff; --danger: #f85149;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { background: var(--bg-primary); color: var(--text); font-family: -apple-system, BlinkMacSystemFont, sans-serif; display: flex; height: 100vh; overflow: hidden; }

.sidebar { width: 260px; background: var(--bg-secondary); border-right: 1px solid var(--border); display: flex; flex-direction: column; }
.logo { padding: 24px; font-size: 20px; font-weight: 600; display: flex; align-items: center; gap: 10px; border-bottom: 1px solid var(--border); }
.nav-menu { display: flex; flex-direction: column; padding: 16px 12px; gap: 8px; }
.nav-item { 
  display: flex; align-items: center; gap: 10px; /* 新增 Flex 对齐 */
  padding: 10px 16px; border-radius: 6px; color: var(--text-muted); text-decoration: none; font-size: 14px; transition: all 0.2s; 
}
/* 新增 SVG 尺寸控制 */
.nav-item svg { width: 18px; height: 18px; flex-shrink: 0; }
.nav-item:hover { background: rgba(255,255,255,0.05); color: var(--text); }
.nav-item.active { background: rgba(88,166,255,0.1); color: var(--accent); font-weight: 500; }

.main-content { flex: 1; overflow-y: auto; padding: 40px; }
.section-header { display: flex; justify-content: space-between; align-items: flex-end; border-bottom: 1px solid var(--border); padding-bottom: 16px; margin-bottom: 24px; }
.section-header h2 { font-size: 24px; font-weight: 500; color: #fff; }
.subtitle { font-size: 13px; color: var(--text-muted); }

.btn-primary { background: #238636; color: #fff; padding: 8px 16px; border-radius: 6px; font-size: 13px; cursor: pointer; transition: 0.2s; }
.btn-primary:hover { background: #2ea043; }

/* 书架网格 */
.book-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 24px; }
.book-card { background: var(--bg-secondary); border: 1px solid var(--border); border-radius: 8px; padding: 16px; cursor: pointer; transition: 0.2s; display: flex; flex-direction: column; aspect-ratio: 3/4; position: relative; }
.book-card:hover { border-color: var(--accent); transform: translateY(-4px); }
.book-icon { font-size: 48px; text-align: center; flex: 1; display: flex; align-items: center; justify-content: center; opacity: 0.8; }
.book-title { font-size: 13px; font-weight: 500; text-align: center; word-break: break-all; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.btn-delete-book { 
  position: absolute; top: 12px; right: 12px; 
  background: rgba(0,0,0,0.6); border: none; color: #fff; 
  width: 32px; height: 32px; /* 增大点击热区 */
  border-radius: 50%; cursor: pointer; opacity: 0; transition: 0.2s; 
  display: flex; align-items: center; justify-content: center; /* 完美居中X */
  font-size: 18px; /* 放大图标 */
  z-index: 10; /* 防止被卡片其他元素遮挡 */
}
.book-card:hover .btn-delete-book { opacity: 1; }
.btn-delete-book:hover { background: var(--danger); }

/* 武器库列表 */
.principle-list {
  display: flex;
  flex-direction: column;
  gap: 32px; /* 从 16px 翻倍，彻底拉开记录之间的间距 */
}
.principle-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px; /* 圆角更大更优雅 */
  padding: 24px 32px 64px 32px; /* 底部留出 64px 空间，防止文字和操作按钮重叠 */
  position: relative;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15); /* 增加悬浮阴影，让卡片具备物理厚度感 */
}
.p-meta { font-size: 12px; color: var(--accent); margin-bottom: 12px; display: flex; justify-content: space-between; }
.p-actions {
  position: absolute;
  bottom: 20px;
  right: 20px;
  display: flex;
  gap: 8px;
}

.btn-action-p {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 12px;
  cursor: pointer;
  transition: 0.2s;
}

.btn-action-p:hover {
  background: var(--bg-hover);
  color: var(--text);
}

.btn-action-p.copy:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-action-p.delete:hover {
  border-color: var(--danger);
  color: var(--danger);
}

/* 空状态 */
.empty-state { display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 80px 20px; color: var(--text-muted); text-align: center; }
.empty-state-icon { font-size: 48px; margin-bottom: 16px; opacity: 0.4; }
.empty-state p { font-size: 14px; margin-bottom: 4px; }
.empty-state .hint { font-size: 12px; opacity: 0.6; }

/* 隐藏文件输入 */
.btn-primary input { display: none; }

/* 视图切换 */
.view-section { display: none; }
.view-section.active { display: block; }

/* 滚动条 */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* 全局拖拽遮罩 */
.drag-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(13, 17, 23, 0.95);
  z-index: 9999;
  display: flex; align-items: center; justify-content: center;
  border: 4px dashed var(--accent);
  margin: 16px; border-radius: 16px;
  pointer-events: none; /* 关键：让事件穿透 */
}
.drag-content { text-align: center; color: var(--accent); }

/* 知识晶体 Markdown 样式适配 (精装博客级排版) */
.p-text {
  font-size: 14.5px; /* 字体适中，清晰锐利 */
  color: #e6edf3;
}
.p-text p {
  margin-bottom: 12px; /* 适度收紧段落间距 */
  line-height: 1.75; /* 优化行高 */
  text-align: justify;
}
.p-text p:last-child { margin-bottom: 0; }
.p-text ul, .p-text ol {
  padding-left: 24px;
  margin-top: 6px;
  margin-bottom: 12px;
}
.p-text li {
  margin-bottom: 6px;
  line-height: 1.75;
}
.p-text li p { margin-bottom: 0; }
.p-text strong {
  color: var(--accent);
  font-weight: 600;
  background: rgba(88, 166, 255, 0.1);
  padding: 0 4px;
  border-radius: 4px;
}
.p-text h1, .p-text h2, .p-text h3, .p-text h4 {
  color: #fff;
  margin-top: 20px;
  margin-bottom: 10px;
  font-weight: 600;
  line-height: 1.4;
}
.p-text h3 { font-size: 18px; border-bottom: 1px solid var(--border); padding-bottom: 6px; }
.p-text h4 { font-size: 16px; }
/* 新增：引用块样式 */
.p-text blockquote {
  border-left: 4px solid var(--accent);
  margin: 12px 0;
  color: var(--text-muted);
  background: rgba(88, 166, 255, 0.05);
  padding: 8px 16px;
  border-radius: 0 4px 4px 0;
}

/* 书架背景水印引导 */
.bg-watermark {
  position: fixed;
  top: 55%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 2.5rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.04); /* 极低透明度，不喧宾夺主 */
  pointer-events: none; /* 事件穿透，不影响点击 */
  z-index: 0;
  white-space: nowrap;
  user-select: none;
}
.book-grid { position: relative; z-index: 1; } /* 确保书籍盖在水印上方 */