/* 语雀风格 — 公开文档阅读 */
:root {
  --doc-primary: #25b864;
  --doc-bg: #f5f6f7;
  --doc-sidebar-bg: #fafbfc;
  --doc-border: #e8e8e8;
  --doc-text: #262626;
  --doc-text-secondary: #8c8c8c;
  --doc-header-h: 52px;
  --doc-sidebar-w: 280px;
  --doc-toc-w: 220px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font);
  background: var(--doc-bg);
  color: var(--doc-text);
  line-height: 1.7;
}

.hidden { display: none !important; }

/* ── 顶栏 ── */
.doc-header {
  height: var(--doc-header-h);
  background: #fff;
  border-bottom: 1px solid var(--doc-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.site-link {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--doc-text);
  font-weight: 600;
  font-size: 14px;
  flex-shrink: 0;
}
.site-link:hover { color: var(--doc-primary); }

.header-sep { color: #d9d9d9; font-size: 14px; }
.book-name { font-size: 14px; color: var(--doc-text-secondary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-search {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: var(--doc-bg);
  border: 1px solid var(--doc-border);
  border-radius: 6px;
}
.header-search svg { color: var(--doc-text-secondary); flex-shrink: 0; }
.header-search input {
  border: none;
  outline: none;
  font-size: 13px;
  width: 160px;
  background: transparent;
}

.edit-link {
  padding: 6px 14px;
  background: var(--doc-primary);
  color: #fff;
  border-radius: 6px;
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
}
.edit-link:hover { background: #1fa855; }

.action-btn {
  padding: 6px 12px;
  border: 1px solid var(--doc-border);
  border-radius: 6px;
  background: #fff;
  font-size: 13px;
  color: var(--doc-text);
  cursor: pointer;
}
.action-btn:hover { border-color: var(--doc-primary); color: var(--doc-primary); }

.readonly-tag {
  font-size: 11px;
  padding: 2px 8px;
  background: #f0f0f0;
  color: var(--doc-text-secondary);
  border-radius: 4px;
}

.doc-readonly .doc-article,
.doc-readonly .doc-content {
  user-select: text;
  -webkit-user-select: text;
}

.doc-readonly .doc-content [contenteditable],
.doc-readonly [contenteditable="true"] {
  -webkit-user-modify: read-only !important;
}

.doc-toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: rgba(0,0,0,.78);
  color: #fff;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 14px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s, transform .2s;
  z-index: 999;
}
.doc-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.search-dropdown {
  position: fixed;
  top: var(--doc-header-h);
  right: 20px;
  width: 320px;
  background: #fff;
  border: 1px solid var(--doc-border);
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,.1);
  max-height: 360px;
  overflow-y: auto;
  z-index: 200;
}
.search-item {
  padding: 10px 14px;
  cursor: pointer;
  font-size: 13px;
  border-bottom: 1px solid #f5f5f5;
}
.search-item:hover { background: #f0faf4; }
.search-item .excerpt { font-size: 12px; color: var(--doc-text-secondary); margin-top: 2px; }

/* ── 布局 ── */
.doc-body {
  display: flex;
  margin-top: var(--doc-header-h);
  min-height: calc(100vh - var(--doc-header-h));
}

/* ── 侧边栏 ── */
.doc-sidebar {
  width: var(--doc-sidebar-w);
  background: var(--doc-sidebar-bg);
  border-right: 1px solid var(--doc-border);
  overflow-y: auto;
  position: fixed;
  top: var(--doc-header-h);
  bottom: 0;
  left: 0;
}

.doc-tree { padding: 12px 0 24px; }

.tree-row {
  display: flex;
  align-items: center;
  gap: 4px;
  min-height: 32px;
  font-size: 13px;
}
.tree-row.active { background: #e6f7ed; }

.tree-toggle {
  width: 16px;
  height: 16px;
  border: none;
  background: none;
  font-size: 10px;
  color: var(--doc-text-secondary);
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.tree-toggle.empty { visibility: hidden; }

.tree-icon { flex-shrink: 0; font-size: 14px; }

.tree-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--doc-text);
  text-decoration: none;
  padding: 4px 0;
}
a.tree-label:hover { color: var(--doc-primary); }
a.tree-label.active { color: var(--doc-primary); font-weight: 500; }

.tree-children.collapsed { display: none; }

/* ── 主内容 ── */
.doc-main {
  flex: 1;
  margin-left: var(--doc-sidebar-w);
  background: #fff;
  min-width: 0;
}

.doc-article {
  max-width: 820px;
  margin: 0 auto;
  padding: 40px 48px 80px;
}

.doc-breadcrumb {
  font-size: 13px;
  color: var(--doc-text-secondary);
  margin-bottom: 16px;
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.doc-breadcrumb .sep { color: #d9d9d9; }

.doc-title {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 12px;
  color: var(--doc-text);
}

.doc-meta {
  font-size: 13px;
  color: var(--doc-text-secondary);
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--doc-border);
}

.doc-content {
  font-size: 15px;
  line-height: 1.8;
}

.doc-content h1, .doc-content h2, .doc-content h3,
.doc-content h4, .doc-content h5, .doc-content h6 {
  margin: 1.5em 0 0.6em;
  font-weight: 600;
  line-height: 1.4;
  scroll-margin-top: 80px;
}
.doc-content h1 { font-size: 28px; }
.doc-content h2 { font-size: 24px; border-bottom: 1px solid #eee; padding-bottom: 8px; }
.doc-content h3 { font-size: 20px; }
.doc-content h4 { font-size: 17px; }

.doc-content p { margin: 0.8em 0; }
.doc-content ul, .doc-content ol { margin: 0.8em 0; padding-left: 1.5em; }
.doc-content li { margin: 0.3em 0; }

.doc-content blockquote {
  margin: 1em 0;
  padding: 12px 16px;
  border-left: 4px solid var(--doc-primary);
  background: #f6ffed;
  color: var(--doc-text-secondary);
}

.doc-content code {
  background: #f5f5f5;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: "SF Mono", Consolas, monospace;
}

.doc-content pre {
  background: #282c34;
  color: #abb2bf;
  padding: 16px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1em 0;
  font-size: 13px;
  line-height: 1.6;
}
.doc-content pre code { background: none; padding: 0; color: inherit; }

.doc-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
  font-size: 14px;
}
.doc-content th, .doc-content td {
  border: 1px solid var(--doc-border);
  padding: 8px 12px;
  text-align: left;
}
.doc-content th { background: #fafafa; font-weight: 600; }

/* 图片网格：等比缩小，桌面一行三张，无白框 */
.doc-img-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 16px 0;
}

.doc-img-item {
  margin: 0;
  padding: 0;
  border: none;
  background: none;
  overflow: hidden;
}

.doc-img-item img {
  width: 100%;
  height: auto;
  object-fit: contain;
  display: block;
  margin: 0;
  border-radius: 4px;
}

/* 段落内嵌图片（非独立图块） */
.doc-content p img,
.doc-content li img,
.doc-content blockquote img {
  max-width: 100%;
  height: auto;
  object-fit: contain;
  border-radius: 4px;
  vertical-align: middle;
}

.doc-content a { color: var(--doc-primary); }

.doc-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 60vh;
  color: var(--doc-text-secondary);
  font-size: 15px;
}

/* ── TOC ── */
.doc-toc {
  width: var(--doc-toc-w);
  position: fixed;
  top: var(--doc-header-h);
  right: 0;
  bottom: 0;
  background: #fff;
  border-left: 1px solid var(--doc-border);
  padding: 32px 16px;
  overflow-y: auto;
}

.doc-main { margin-right: var(--doc-toc-w); }

.toc-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--doc-text-secondary);
  margin-bottom: 12px;
}

.toc-nav a {
  display: block;
  font-size: 12px;
  color: var(--doc-text-secondary);
  text-decoration: none;
  padding: 4px 0 4px 8px;
  border-left: 2px solid transparent;
  margin-left: -10px;
  line-height: 1.5;
}
.toc-nav a:hover, .toc-nav a.active { color: var(--doc-primary); border-left-color: var(--doc-primary); }
.toc-nav .level-2 { padding-left: 16px; }
.toc-nav .level-3 { padding-left: 24px; }
.toc-nav .level-4 { padding-left: 32px; }
.toc-nav .level-5 { padding-left: 40px; }
.toc-nav .level-6 { padding-left: 48px; }

@media (max-width: 1100px) {
  .doc-toc { display: none; }
  .doc-main { margin-right: 0; }
}

@media (max-width: 768px) {
  .doc-sidebar {
    position: static;
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--doc-border);
    max-height: 200px;
  }
  .doc-body { flex-direction: column; }
  .doc-main { margin-left: 0; }
  .doc-article { padding: 24px 20px 60px; }
  .doc-title { font-size: 26px; }

  .doc-img-grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .doc-img-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}