/* ================================================================
   Obsidian Blog — 样式表
   三栏布局 · 深色/浅色主题 · 响应式
   ================================================================ */

/* ---------- CSS Variables (Light) ---------- */
:root,
:root[data-theme="light"] {
  --bg:           #ffffff;
  --bg-secondary: #f6f8fa;
  --bg-tertiary:  #eef1f5;
  --text:         #1f2328;
  --text-muted:   #656d76;
  --border:       #d0d7de;
  --link:         #0969da;
  --link-hover:   #0550ae;
  --accent:       #0969da;
  --mark-bg:      #fff8c5;
  --mark-text:    #1f2328;
  --code-bg:      #f6f8fa;
  --code-text:    #1f2328;
  --pre-bg:       #24292e;
  --pre-text:     #e1e4e8;
  --tag-bg:       #ddf4ff;
  --tag-text:     #0969da;
  --callout-note: #0969da;
  --callout-tip:  #1a7f37;
  --callout-warn: #9a6700;
  --callout-err:  #cf222e;
  --shadow:       0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-lg:    0 4px 12px rgba(0,0,0,.1);
  --radius:       8px;
  --footer-reserve: 56px;
  --footer-friend-reserve: 104px;
  --header-bg:    rgba(255,255,255,.85);
  --sidebar-bg:   #f9fafb;
  --graph-node:   #0969da;
  --graph-node-dim:#b0b8c4;
  --graph-link:   #d0d7de;
  --graph-current:#e85d04;
  --font-sans:    -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial,
                  "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
                  sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --font-mono:    "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
}

/* ---------- CSS Variables (Dark) ---------- */
:root[data-theme="dark"] {
  --bg:           #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary:  #1c2129;
  --text:         #e6edf3;
  --text-muted:   #8b949e;
  --border:       #30363d;
  --link:         #58a6ff;
  --link-hover:   #79c0ff;
  --accent:       #58a6ff;
  --mark-bg:      #bb800926;
  --mark-text:    #e6edf3;
  --code-bg:      #161b22;
  --code-text:    #e6edf3;
  --pre-bg:       #161b22;
  --pre-text:     #e6edf3;
  --tag-bg:       #1f2a3d;
  --tag-text:     #58a6ff;
  --callout-note: #58a6ff;
  --callout-tip:  #3fb950;
  --callout-warn: #d29922;
  --callout-err:  #f85149;
  --shadow:       0 1px 3px rgba(0,0,0,.3);
  --shadow-lg:    0 4px 12px rgba(0,0,0,.4);
  --header-bg:    rgba(13,17,23,.85);
  --sidebar-bg:   #0d1117;
  --graph-node:   #58a6ff;
  --graph-node-dim:#444c56;
  --graph-link:   #30363d;
  --graph-current:#f0883e;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  height: 100%;
  overflow: hidden;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}
body {
  height: 100%;
  overflow: hidden;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

/* ================================================================
   Layout
   ================================================================ */

.page-wrapper {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  min-height: 0;
  overflow: hidden;
  padding-bottom: var(--footer-reserve);
}
.page-wrapper.has-friend-links { padding-bottom: var(--footer-friend-reserve); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  flex: 0 0 56px;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  height: 56px;
  padding: 0 20px;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-left {
  display: flex;
  flex: 1;
  min-width: 0;
  align-items: center;
  gap: 8px;
}

.site-title {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 1.1em;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}
.site-title:hover { color: var(--link); text-decoration: none; }

.header-actions {
  display: flex;
  flex-shrink: 0;
  gap: 4px;
}

.icon-btn {
  background: none;
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1.1em;
  padding: 6px 10px;
  color: var(--text-muted);
  transition: all .15s;
}
.icon-btn:hover {
  background: var(--bg-secondary);
  border-color: var(--border);
  color: var(--text);
}

.mobile-menu-btn { display: none; flex-shrink: 0; }

/* ---------- Search Panel ---------- */
.search-panel {
  padding: 12px 20px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}
.search-panel.hidden { display: none; }

#search-input {
  width: 100%;
  max-width: 500px;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95em;
  background: var(--bg);
  color: var(--text);
  outline: none;
}
#search-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(9,105,218,.15); }

#search-results {
  margin-top: 8px;
  max-height: 300px;
  overflow-y: auto;
}
#search-results a {
  display: block;
  padding: 6px 14px;
  color: var(--text);
  text-decoration: none;
  border-radius: 4px;
  font-size: 0.92em;
}
#search-results a:hover { background: var(--bg-tertiary); }
.search-snippet {
  display: block;
  font-size: 0.82em;
  color: var(--text-muted);
  line-height: 1.4;
  margin-top: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.search-title { display: block; }
.search-hl {
  background: var(--mark-bg);
  color: var(--accent);
  font-weight: 600;
  padding: 0 1px;
  border-radius: 2px;
}

/* ---------- Body Container (三栏) ---------- */
.body-container {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr) 260px;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  max-width: none;
  margin: 0 auto;
  width: 85%;
}

/* ---------- Sidebar (共用) ---------- */
.sidebar-left,
.sidebar-right {
  min-height: 0;
  overflow-y: auto;
  padding: 20px 16px calc(20px + env(safe-area-inset-bottom, 0px));
  background: var(--sidebar-bg);
}

.sidebar-left { border-right: 1px solid var(--border); }
.sidebar-right { border-left: 1px solid var(--border); }

.sidebar-title {
  font-size: 0.85em;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 12px;
  padding: 0 8px;
}

/* ---------- Left Nav Items ---------- */
.nav-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-tree-node { min-width: 0; }
.nav-tree-row {
  display: flex;
  align-items: stretch;
  min-width: 0;
}
.nav-tree-row > .nav-item {
  flex: 1;
  min-width: 0;
}
.nav-toggle,
.nav-toggle-spacer {
  flex: 0 0 22px;
  width: 22px;
}
.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
}
.nav-toggle:hover {
  background: var(--bg-tertiary);
  color: var(--text);
}
.nav-toggle span {
  display: block;
  transition: transform .15s ease;
}
.nav-toggle.collapsed span { transform: rotate(-90deg); }
.nav-children {
  margin-left: 11px;
  padding-left: 10px;
  border-left: 1px solid var(--border);
}
.nav-children[hidden] { display: none; }

.nav-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 6px;
  row-gap: 2px;
  align-items: start;
  padding: 6px 8px;
  border-radius: 6px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.88em;
  line-height: 1.4;
  transition: background .15s;
}
.nav-item:hover {
  background: var(--bg-tertiary);
  text-decoration: none;
}
.nav-item.active {
  background: var(--bg-tertiary);
  font-weight: 600;
  color: var(--accent);
}

.nav-icon {
  font-size: 0.9em;
  flex-shrink: 0;
  grid-row: 1 / span 2;
  margin-top: 1px;
}
.nav-date {
  color: var(--text-muted);
  font-size: 0.82em;
  white-space: nowrap;
  line-height: 1.2;
}
.nav-title {
  min-width: 0;
  line-height: 1.35;
  word-break: break-word;
}

/* ---------- Content ---------- */
.content {
  min-height: 0;
  padding: 40px 48px 24px;
  max-width: 100%;
  overflow-y: auto;
  overflow-x: hidden;
}

/* ---------- Graph Container ---------- */
#graph-container,
#graph-container-mobile {
  width: 100%;
  height: 360px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg);
}
#graph-container svg,
#graph-container-mobile svg { width: 100%; height: 100%; }

/* Mobile graph: hidden on desktop */
.mobile-graph { display: none; }

/* ---------- Footer ---------- */
.site-footer {
  text-align: center;
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 70;
  height: var(--footer-reserve);
  overflow-y: auto;
  padding: 10px 24px;
  font-size: 0.85em;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  box-shadow: 0 -6px 18px rgba(0,0,0,.08);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
}
.site-footer.has-friend-links {
  height: var(--footer-friend-reserve);
  padding: 12px 24px;
}
.site-footer p { margin: 0; }

.friend-links {
  width: min(100%, 980px);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px 14px;
  text-align: center;
  flex-wrap: wrap;
}
.friend-links-title {
  color: var(--text);
  font-weight: 600;
  white-space: nowrap;
  line-height: 1.9;
}
.friend-links-list {
  min-width: 0;
  max-height: 42px;
  overflow-y: auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 12px;
}
.friend-link {
  max-width: 100%;
  color: var(--link);
  background: var(--tag-bg);
  border: 1px solid rgba(9,105,218,.22);
  border-radius: 999px;
  padding: 2px 10px;
  line-height: 1.55;
  overflow-wrap: anywhere;
  font-weight: 500;
  box-shadow: 0 1px 2px rgba(0,0,0,.04);
}
.friend-link:hover {
  color: var(--link-hover);
  border-color: var(--link-hover);
  text-decoration: none;
}

/* ================================================================
   Markdown Body (文章内容排版)
   ================================================================ */

.markdown-body { max-width: none; }

/* Post metadata */
.post-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 1.5em;
  flex-wrap: wrap;
}
.post-date { color: var(--text-muted); font-size: 0.9em; }
.post-tags { display: flex; gap: 6px; flex-wrap: wrap; }

/* Prev / Next navigation */
.post-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 2.5em;
  padding-top: 1.2em;
  border-top: 1px solid var(--border);
  gap: 1em;
  flex-wrap: wrap;
}
.post-nav a {
  color: var(--link);
  font-size: 0.95em;
  text-decoration: none;
  max-width: 48%;
}
.post-nav a:hover { text-decoration: underline; }
.post-nav .next-post { margin-left: auto; text-align: right; }

/* Headings */
h1, h2, h3, h4, h5, h6 {
  margin-top: 1.8em;
  margin-bottom: 0.6em;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text);
}
h1 { font-size: 2em; border-bottom: 1px solid var(--border); padding-bottom: .3em; }
h2 { font-size: 1.5em; border-bottom: 1px solid var(--border); padding-bottom: .25em; }
h3 { font-size: 1.25em; }
h4 { font-size: 1em; }
.markdown-body > h1:first-child,
.markdown-body > .post-meta + h1 { margin-top: 0; }

/* Paragraphs & inline */
p { margin: 0 0 1em; }
a { color: var(--link); text-decoration: none; }
a:hover { color: var(--link-hover); text-decoration: underline; }
strong { font-weight: 600; }
mark {
  background: var(--mark-bg);
  color: var(--mark-text);
  padding: 0.1em 0.3em;
  border-radius: 3px;
}
hr {
  height: 2px;
  margin: 2em 0;
  background: var(--border);
  border: none;
}

/* Lists */
ul, ol { padding-left: 1.8em; margin: 0 0 1em; }
li { margin: 0.25em 0; }
li > ul, li > ol { margin: 0; }

.task-item {
  list-style: none;
  margin-left: -1.4em;
  display: flex;
  align-items: baseline;
  gap: 0.4em;
}
.task-item input[type="checkbox"] { margin: 0; transform: scale(1.15); accent-color: var(--accent); }
.task-done { color: var(--text-muted); text-decoration: line-through; }

/* Blockquote */
blockquote {
  margin: 0 0 1em;
  padding: 0.5em 1em;
  border-left: 4px solid var(--border);
  color: var(--text-muted);
  background: var(--bg-secondary);
  border-radius: 0 var(--radius) var(--radius) 0;
}
blockquote p:last-child { margin-bottom: 0; }

/* Code */
code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--code-bg);
  color: var(--code-text);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}
pre {
  margin: 0 0 1em;
  padding: 1em 1.2em;
  background: var(--pre-bg);
  color: var(--pre-text);
  border-radius: var(--radius);
  overflow-x: auto;
  box-shadow: var(--shadow);
  line-height: 1.55;
}
pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: 0.9em;
  border-radius: 0;
}

/* Table */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1em;
  display: block;
  overflow-x: auto;
}
th, td {
  padding: 8px 14px;
  border: 1px solid var(--border);
  text-align: left;
}
th { font-weight: 600; background: var(--bg-secondary); }
tr:nth-child(even) { background: var(--bg-secondary); }

/* Images */
img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: block;
  margin: 1em auto;
}
.embed-image { text-align: center; margin: 1em 0; }

/* Video */
.markdown-body video {
  max-width: 100%;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.embed-video { text-align: center; margin: 1em 0; }
.embed-video video {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  background: #000;
}

/* Embed note */
.embed-note {
  margin: 1em 0;
  padding: 0.8em 1em;
  background: var(--bg-secondary);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
}
.embed-note a { font-weight: 500; }
.embed-icon { margin-right: 0.3em; }

.embed-missing {
  margin: 1em 0;
  padding: 0.8em 1em;
  background: #fff3cd;
  border: 1px solid #ffc107;
  border-radius: var(--radius);
  color: #856404;
}
:root[data-theme="dark"] .embed-missing {
  background: #332701;
  border-color: #664d00;
  color: #ffc107;
}

/* Callout */
.callout {
  margin: 1em 0;
  border-radius: var(--radius);
  border-left: 4px solid var(--callout-note);
  background: var(--bg-secondary);
  overflow: hidden;
}
.callout-title {
  font-weight: 600;
  padding: 0.6em 1em;
  font-size: 0.95em;
}
.callout-content {
  padding: 0 1em 0.6em;
  color: var(--text);
}
.callout-content p:last-child { margin-bottom: 0; }
.callout-tip, .callout-success, .callout-check, .callout-done,
.callout-hint { border-left-color: var(--callout-tip); }
.callout-warning, .callout-caution, .callout-important { border-left-color: var(--callout-warn); }
.callout-danger, .callout-error, .callout-failure, .callout-fail,
.callout-missing, .callout-bug { border-left-color: var(--callout-err); }

/* Wikilink */
.wikilink {
  color: var(--link);
  border-bottom: 1px dashed var(--link);
  padding-bottom: 1px;
  text-decoration: none;
}
.wikilink:hover { text-decoration: none; border-bottom-style: solid; }
.wikilink.broken {
  color: var(--text-muted);
  border-bottom-color: var(--text-muted);
  cursor: default;
}

/* Tag */
.tag {
  display: inline-block;
  font-size: 0.85em;
  background: var(--tag-bg);
  color: var(--tag-text);
  padding: 0.05em 0.55em;
  border-radius: 12px;
  vertical-align: baseline;
  text-decoration: none;
  cursor: pointer;
  transition: opacity .15s;
}
a.tag:hover { opacity: 0.8; text-decoration: none; }

/* Tag page */
.tag-count { color: var(--text-muted); margin-bottom: 1em; }
.tag-post-list { list-style: none; padding-left: 0; }
.tag-post-list li { padding: 6px 0; border-bottom: 1px solid var(--border); }
.tag-post-list li:last-child { border-bottom: none; }

/* Recent posts */
.recent-posts ul {
  list-style: none;
  padding-left: 0;
}
.recent-posts li {
  padding: 4px 0;
}
.recent-date {
  color: var(--text-muted);
  font-size: 0.88em;
  margin-right: 4px;
}
.recent-note {
  color: var(--text-muted);
  font-size: 0.88em;
  font-style: italic;
  margin-top: 8px;
}

/* Footnotes */
.footnote {
  font-size: 0.88em;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  margin-top: 2em;
  padding-top: 1em;
}

/* Mermaid */
.mermaid { text-align: center; margin: 1.5em 0; }

/* ================================================================
   Responsive
   ================================================================ */

/* Tablet: 隐藏右侧边栏，显示移动版图谱 */
@media (max-width: 1100px) {
  .body-container { grid-template-columns: 300px minmax(0, 1fr); width: 100%; }
  .sidebar-right { display: none; }
  .content { padding: 32px 36px 24px; }
  .mobile-graph { display: block; margin-top: 2em; padding-top: 1.5em; border-top: 1px solid var(--border); }
}

/* Mobile: 隐藏两侧边栏 */
@media (max-width: 768px) {
  .body-container { grid-template-columns: 1fr; width: 100%; }
  .sidebar-left {
    display: block;
    position: fixed;
    top: 56px;
    left: 0;
    width: 320px;
    height: calc(100vh - 56px);
    height: calc(100dvh - 56px);
    padding-bottom: calc(20px + env(safe-area-inset-bottom, 0px));
    z-index: 90;
    box-shadow: var(--shadow-lg);
    border-right: 1px solid var(--border);
    transform: translateX(-100%);
    transition: transform .3s cubic-bezier(.4, 0, .2, 1);
    will-change: transform;
  }
  .sidebar-left.open { transform: translateX(0); }
  .sidebar-right { display: none; }
  .mobile-menu-btn { display: inline-flex; }
  .content { padding: 24px 16px 60px; }
  .mobile-graph { display: block; margin-top: 2em; padding-top: 1.5em; border-top: 1px solid var(--border); }
  #graph-container-mobile { height: 320px; }
  .markdown-body img { border-radius: 4px; }
  .page-wrapper,
  .page-wrapper.has-friend-links { padding-bottom: 0; }
  .site-footer,
  .site-footer.has-friend-links {
    position: static;
    height: auto;
    overflow: visible;
    padding: 20px 16px;
    background: var(--bg);
    backdrop-filter: none;
    box-shadow: none;
  }
  .friend-links { flex-direction: column; }
  .friend-links-list { justify-content: center; max-height: none; overflow: visible; }
  h1 { font-size: 1.5em; }
  h2 { font-size: 1.25em; }
  .nav-item { padding: 10px 8px; font-size: 0.92em; }
}

/* Mobile overlay */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  top: 56px;
  background: rgba(0,0,0,.3);
  z-index: 80;
  opacity: 0;
  transition: opacity .3s ease;
}
.sidebar-overlay.open { display: block; opacity: 1; }

/* ================================================================
   Print
   ================================================================ */
@media print {
  body { background: #fff; color: #000; }
  .site-header, .sidebar-left, .sidebar-right, .site-footer,
  .search-panel, .mobile-menu-btn { display: none !important; }
  .body-container { grid-template-columns: 1fr; }
  .content { max-width: none; padding: 0; }
  pre { box-shadow: none; border: 1px solid #ddd; }
  a { color: #000; text-decoration: underline; }
  img { box-shadow: none; }
}

/* ================================================================
   Scrollbar (美化)
   ================================================================ */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }