From f5938f34c146e8df8cb71a532d99e7007e0b7471 Mon Sep 17 00:00:00 2001
From: Himanshu Sardana <himanshusardana2005@gmail.com>
Date: Fri, 20 Mar 2026 21:52:12 +0000
Subject: feat: add toc styles

---
 layout.html | 228 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 224 insertions(+), 4 deletions(-)

(limited to 'layout.html')

diff --git a/layout.html b/layout.html
index 5825099..68772ef 100644
--- a/layout.html
+++ b/layout.html
@@ -5,7 +5,6 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <meta name="description" content="{{ .Title }}" />
     <title>{{ .Title }}</title>
-
     <link rel="preconnect" href="https://fonts.googleapis.com" />
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
     <link
@@ -14,11 +13,232 @@
     />
     <script src="https://cdn.jsdelivr.net/npm/prismjs/prism.js"></script>
     <script src="https://cdn.jsdelivr.net/npm/prismjs/plugins/autoloader/prism-autoloader.min.js"></script>
+    <link rel="stylesheet" href="../style.css" />
+    <style>
+      .toc {
+        position: static !important;
+        width: auto !important;
+        right: auto !important;
+        top: auto !important;
+        background: var(--bg-subtle) !important;
+        border: 1px solid var(--border) !important;
+        padding: 1.2rem 1.4rem !important;
+        margin: 0 0 3rem !important;
+      }
 
-    <link rel="stylesheet" href="../themes/tufte.css" />
-  </head>
+      .toc-title {
+        margin: 0 0 0.8rem !important;
+        font-size: 0.65rem !important;
+        line-height: 1 !important;
+        display: block;
+      }
+
+      .toc ul {
+        display: block;
+        margin: 0;
+        padding: 0;
+      }
+
+      .toc li {
+        display: block;
+        padding-left: 0 !important;
+        margin: 0.25rem 0 !important;
+      }
+
+      .toc li::before {
+        display: none !important;
+      }
+
+      .toc a.active {
+        color: var(--text);
+        font-weight: 500;
+      }
+
+      .toc-toggle {
+        display: flex;
+        align-items: center;
+        gap: 0.5rem;
+        cursor: pointer;
+        background: none;
+        border: none;
+        padding: 0;
+        font-family: var(--mono);
+        font-size: 0.65rem;
+        letter-spacing: 0.1em;
+        text-transform: uppercase;
+        color: var(--text-muted);
+        margin-bottom: 0.8rem;
+        width: 100%;
+        text-align: left;
+      }
+
+      .toc-toggle svg {
+        transition: transform 140ms ease;
+        flex-shrink: 0;
+      }
+
+      .toc-toggle[aria-expanded="false"] svg {
+        transform: rotate(-90deg);
+      }
+
+      .toc-body {
+        overflow: hidden;
+        transition:
+          max-height 240ms ease,
+          opacity 200ms ease;
+        max-height: 800px;
+        opacity: 1;
+      }
+
+      .toc-body.collapsed {
+        max-height: 0;
+        opacity: 0;
+      }
+
+      @media (max-width: 699px) {
+        .toc-title {
+          display: none;
+        }
+        .toc-toggle {
+          display: flex;
+        }
+        .toc-body {
+        }
+      }
+
+      @media (min-width: 700px) {
+        .toc-toggle {
+          display: none;
+        }
+        .toc-title {
+          display: block;
+        }
+        .toc-body {
+          max-height: none !important;
+          opacity: 1 !important;
+        }
+      }
+
+      @media (min-width: 1100px) {
+        .toc {
+          position: fixed !important;
+          top: 6rem !important;
+          left: max(2rem, calc((100vw - 680px) / 2 - 220px)) !important;
+          width: 200px !important;
+          background: transparent !important;
+          border: none !important;
+          padding: 0 !important;
+          margin: 0 !important;
+        }
 
+        .toc-toggle {
+          display: none;
+        }
+        .toc-title {
+          display: block;
+        }
+        .toc-body {
+          max-height: none !important;
+          opacity: 1 !important;
+        }
+
+        .toc-level-2 {
+          margin-left: 0.8rem !important;
+        }
+        .toc-level-3 {
+          margin-left: 1.4rem !important;
+        }
+        .toc-level-4 {
+          margin-left: 2rem !important;
+        }
+      }
+    </style>
+  </head>
   <body>
-    <main class="article">{{ .Content }}</main>
+    <main class="article">
+      <nav class="toc" aria-label="Table of contents">
+        <button
+          class="toc-toggle"
+          aria-expanded="false"
+          aria-controls="toc-body"
+        >
+          <svg
+            width="10"
+            height="10"
+            viewBox="0 0 10 10"
+            fill="none"
+            aria-hidden="true"
+          >
+            <path
+              d="M2 3.5L5 6.5L8 3.5"
+              stroke="currentColor"
+              stroke-width="1.4"
+              stroke-linecap="round"
+              stroke-linejoin="round"
+            />
+          </svg>
+          Contents
+        </button>
+
+        <p class="toc-title" aria-hidden="true">Contents</p>
+
+        <div class="toc-body collapsed" id="toc-body">
+          <ul>
+            {{ range .TOC }}
+            <li class="toc-level-{{ .Level }}">
+              <a href="#{{ .ID }}">{{ .Text }}</a>
+            </li>
+            {{ end }}
+          </ul>
+        </div>
+      </nav>
+
+      <h1>{{ .Title }}</h1>
+      {{ .Content }}
+    </main>
+
+    <script>
+      const toggle = document.querySelector(".toc-toggle");
+      const body = document.getElementById("toc-body");
+
+      if (toggle && body) {
+        toggle.addEventListener("click", () => {
+          const expanded = toggle.getAttribute("aria-expanded") === "true";
+          toggle.setAttribute("aria-expanded", String(!expanded));
+          body.classList.toggle("collapsed", expanded);
+        });
+      }
+
+      const tocLinks = document.querySelectorAll(".toc a");
+
+      if (tocLinks.length > 0) {
+        const headingIDs = Array.from(tocLinks).map((a) =>
+          decodeURIComponent(a.getAttribute("href").slice(1)),
+        );
+        const headings = headingIDs
+          .map((id) => document.getElementById(id))
+          .filter(Boolean);
+
+        let current = null;
+
+        const observer = new IntersectionObserver(
+          (entries) => {
+            entries.forEach((entry) => {
+              if (entry.isIntersecting) {
+                current = entry.target.id;
+              }
+            });
+
+            tocLinks.forEach((a) => {
+              const id = decodeURIComponent(a.getAttribute("href").slice(1));
+              a.classList.toggle("active", id === current);
+            });
+          },
+          { rootMargin: "0px 0px -70% 0px", threshold: 0 },
+        );
+
+        headings.forEach((h) => observer.observe(h));
+      }
+    </script>
   </body>
 </html>
-- 
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