Add lucide icons and TOC toggle

public/style.css

@@ -97,7 +97,7 @@ a:hover { color: var(--brand-strong); }
   background: var(--brand-mark-bg);
   color: #fff; font-weight: 700; box-shadow: var(--shadow-sm);
 }
-.sidebar-brand-text { display: grid; line-height: 1.15; }
+.sidebar-brand-text { display: grid; line-height: 1.3; }
 .sidebar-brand-text strong { font-size: 15px; }
 .sidebar-brand-text small { color: var(--text-muted); font-size: 12px; }
 .search-box input {
@@ -186,6 +186,13 @@ a:hover { color: var(--brand-strong); }
   border-bottom: 0;
   backdrop-filter: none;
 }
+.toolbar-breadcrumb-group {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  min-width: 0;
+  flex: 1;
+}
 .toolbar-breadcrumb {
   display: flex;
   align-items: center;
@@ -254,7 +261,27 @@ a:hover { color: var(--brand-strong); }
   cursor: pointer; display: grid; place-items: center; font-size: 16px;
 }
 .btn-icon:hover { background: var(--bg-soft); color: var(--text); border-color: var(--border); }
-
+.btn-icon svg,
+.btn-icon i svg {
+  width: 18px;
+  height: 18px;
+  stroke: currentColor;
+  stroke-width: 2;
+  fill: none;
+  stroke-linecap: round;
+  stroke-linejoin: round;
+}
+.btn-icon i {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 18px;
+  height: 18px;
+}
+.btn-sidebar-toggle {
+  flex: 0 0 auto;
+  display: grid;
+}
 .content-body {
   flex: 1;
   overflow: auto;
@@ -285,6 +312,12 @@ a:hover { color: var(--brand-strong); }
   gap: 24px;
   align-items: start;
 }
+.article-layout.toc-collapsed {
+  grid-template-columns: minmax(0, 1fr) 68px;
+}
+.article-main {
+  min-width: 0;
+}
 .article-header {
   padding: 10px 0 14px;
   margin-bottom: 20px;
@@ -300,10 +333,22 @@ a:hover { color: var(--brand-strong); }
   font-size: clamp(30px, 4vw, 44px); line-height: 1.08;
   letter-spacing: -0.03em; color: var(--text);
 }
-.article-meta { display: flex; flex-wrap: wrap; gap: 10px 16px; color: var(--text-muted); font-size: 13px; }
-.article-meta-side {
-  display: grid;
-  gap: 10px;
+.article-meta {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 10px 16px;
+  color: var(--text-muted);
+  font-size: 13px;
+}
+.article-meta-footer {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 8px 18px;
+  margin-top: 32px;
+  padding-top: 18px;
+  border-top: 1px solid var(--border);
+  color: var(--text-muted);
+  font-size: 13px;
 }
 .article-meta-item {
   display: inline-flex;
@@ -313,6 +358,10 @@ a:hover { color: var(--brand-strong); }
   border-radius: 0;
   background: transparent;
 }
+.article-meta-item em {
+  font-style: italic;
+  opacity: 0.9;
+}
 .article-body {
   font-size: 16px; line-height: 1.85; color: var(--text);
 }
@@ -424,6 +473,7 @@ a:hover { color: var(--brand-strong); }
   gap: 14px;
   position: sticky;
   top: 18px;
+  margin-top: 48px;
 }
 .toc-card {
   padding: 16px 14px;
@@ -433,8 +483,12 @@ a:hover { color: var(--brand-strong); }
   box-shadow: var(--shadow-sm);
   backdrop-filter: blur(18px);
 }
-.meta-card {
-  padding-bottom: 14px;
+.toc-card-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 10px;
+  margin-bottom: 12px;
 }
 .toc-title {
   font-size: 12px;
@@ -442,12 +496,40 @@ a:hover { color: var(--brand-strong); }
   letter-spacing: 0.08em;
   text-transform: uppercase;
   color: var(--text-muted);
-  margin-bottom: 12px;
+}
+.toc-toggle-btn {
+  width: 30px;
+  height: 30px;
+  border-radius: 10px;
+  color: var(--text-soft);
+}
+.toc-toggle-btn i,
+.toc-toggle-btn svg,
+.toc-toggle-btn i svg {
+  width: 15px;
+  height: 15px;
 }
 .toc-nav {
   display: grid;
   gap: 4px;
 }
+.toc-panel.is-collapsed .toc-card {
+  /* padding: 12px 10px; */
+  padding-left: 9px;
+  padding-right: 9px;
+}
+.toc-panel.is-collapsed .toc-card-header {
+  justify-content: center;
+  margin-bottom: 0;
+}
+.toc-panel.is-collapsed .toc-title,
+.toc-panel.is-collapsed .toc-nav {
+  display: none;
+}
+/* .toc-panel.is-collapsed .toc-toggle-btn {
+  width: 36px;
+  height: 36px;
+} */
 .toc-link {
   display: flex;
   align-items: center;
@@ -517,7 +599,11 @@ a:hover { color: var(--brand-strong); }
     opacity: 1;
   }
   .content-toolbar { padding-left: 18px; }
+  .toolbar-breadcrumb-group {
+    gap: 10px;
+  }
   .toolbar-breadcrumb { min-width: 0; }
+  .btn-sidebar-toggle-toolbar { display: none !important; }
   .theme-select-wrap { max-width: 150px; }
   .theme-select { min-width: 0; width: 100%; }
   .markdown-body { width: min(100%, calc(100% - 28px)); padding-top: 20px; padding-bottom: 72px; }