diff --git a/CLAUDE.md b/CLAUDE.md
index 2bc60a4..8df3e70 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -39,12 +39,13 @@ No test framework is configured.
 
 ## Styling
 
-- Tailwind CSS v3 with `darkMode: 'class'` (toggled by `next-themes`)
+- Tailwind CSS v4 with CSS-first configuration (no `tailwind.config.cjs`)
+- Dark mode via `@custom-variant dark` in `styles/globals.css` (class-based, toggled by `next-themes`)
+- Theme customization via `@theme` block in `styles/globals.css`: colors, fonts, easing, durations, shadows, keyframes, animations
 - Accent color system via CSS variables set in `app/layout.tsx` from env vars: `--color-accent`, `--color-accent-soft`, `--color-accent-text-light`, `--color-accent-text-dark`
-- Tailwind extends these as `accent`, `accent-soft`, `accent-textLight`, `accent-textDark` in `tailwind.config.cjs`
-- Typography plugin (`@tailwindcss/typography`) with custom `prose` / `prose-dark` overrides
+- Typography plugin (`@tailwindcss/typography`) loaded via `@plugin` directive; prose dark mode handled by custom `.dark .prose` CSS overrides
 - English headings use Playfair Display serif (`--font-serif-eng`); body uses Inter + CJK fallback stack
-- Config files use CommonJS (`.cjs`): `tailwind.config.cjs`, `postcss.config.cjs`
+- PostCSS config: `postcss.config.mjs` using `@tailwindcss/postcss`
 
 ## Content Submodule
 
diff --git a/app/blog/[slug]/page.tsx b/app/blog/[slug]/page.tsx
index f9daa43..2ad2aca 100644
--- a/app/blog/[slug]/page.tsx
+++ b/app/blog/[slug]/page.tsx
@@ -201,7 +201,7 @@ export default async function BlogPostPage({ params }: Props) {
             <ScrollReveal>
               <article
                 data-toc-content={slug}
-                className="prose prose-lg prose-slate mx-auto max-w-none dark:prose-dark"
+                className="prose prose-lg prose-slate mx-auto max-w-none dark:prose-invert"
               >
                 {post.feature_image && (
                   <div className="-mx-4 mb-8 transition-all duration-500 sm:-mx-12 lg:-mx-20 group-[.toc-open]:lg:-mx-4">
diff --git a/app/pages/[slug]/page.tsx b/app/pages/[slug]/page.tsx
index 7040194..82a9c37 100644
--- a/app/pages/[slug]/page.tsx
+++ b/app/pages/[slug]/page.tsx
@@ -113,7 +113,7 @@ export default async function StaticPage({ params }: Props) {
             <ScrollReveal>
               <article
                 data-toc-content={slug}
-                className="prose prose-lg prose-slate mx-auto max-w-none dark:prose-dark"
+                className="prose prose-lg prose-slate mx-auto max-w-none dark:prose-invert"
               >
                 {page.feature_image && (
                   <div className="-mx-4 mb-8 transition-all duration-500 sm:-mx-12 lg:-mx-20 group-[.toc-open]:lg:-mx-4">
diff --git a/next-env.d.ts b/next-env.d.ts
index 9edff1c..c4b7818 100644
--- a/next-env.d.ts
+++ b/next-env.d.ts
@@ -1,6 +1,6 @@
 /// <reference types="next" />
 /// <reference types="next/image-types/global" />
-import "./.next/types/routes.d.ts";
+import "./.next/dev/types/routes.d.ts";
 
 // NOTE: This file should not be edited
 // see https://nextjs.org/docs/app/api-reference/config/typescript for more information.
diff --git a/package-lock.json b/package-lock.json
index a477dae..2e3341e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -31,17 +31,17 @@
         "unist-util-visit": "^5.0.0"
       },
       "devDependencies": {
+        "@tailwindcss/postcss": "^4.1.18",
         "@tailwindcss/typography": "^0.5.19",
         "@types/node": "^24.10.1",
         "@types/react": "^19.2.5",
         "@types/react-dom": "^19.2.3",
-        "autoprefixer": "^10.4.22",
         "concurrently": "^9.2.1",
         "eslint": "^9.39.1",
         "eslint-config-next": "^16.0.3",
         "pagefind": "^1.4.0",
         "postcss": "^8.5.6",
-        "tailwindcss": "^3.4.18",
+        "tailwindcss": "^4.1.18",
         "typescript": "^5.9.3"
       }
     },
@@ -2958,6 +2958,277 @@
         "tslib": "^2.8.0"
       }
     },
+    "node_modules/@tailwindcss/node": {
+      "version": "4.1.18",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/node/-/node-4.1.18.tgz",
+      "integrity": "sha512-DoR7U1P7iYhw16qJ49fgXUlry1t4CpXeErJHnQ44JgTSKMaZUdf17cfn5mHchfJ4KRBZRFA/Coo+MUF5+gOaCQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/remapping": "^2.3.4",
+        "enhanced-resolve": "^5.18.3",
+        "jiti": "^2.6.1",
+        "lightningcss": "1.30.2",
+        "magic-string": "^0.30.21",
+        "source-map-js": "^1.2.1",
+        "tailwindcss": "4.1.18"
+      }
+    },
+    "node_modules/@tailwindcss/oxide": {
+      "version": "4.1.18",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide/-/oxide-4.1.18.tgz",
+      "integrity": "sha512-EgCR5tTS5bUSKQgzeMClT6iCY3ToqE1y+ZB0AKldj809QXk1Y+3jB0upOYZrn9aGIzPtUsP7sX4QQ4XtjBB95A==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 10"
+      },
+      "optionalDependencies": {
+        "@tailwindcss/oxide-android-arm64": "4.1.18",
+        "@tailwindcss/oxide-darwin-arm64": "4.1.18",
+        "@tailwindcss/oxide-darwin-x64": "4.1.18",
+        "@tailwindcss/oxide-freebsd-x64": "4.1.18",
+        "@tailwindcss/oxide-linux-arm-gnueabihf": "4.1.18",
+        "@tailwindcss/oxide-linux-arm64-gnu": "4.1.18",
+        "@tailwindcss/oxide-linux-arm64-musl": "4.1.18",
+        "@tailwindcss/oxide-linux-x64-gnu": "4.1.18",
+        "@tailwindcss/oxide-linux-x64-musl": "4.1.18",
+        "@tailwindcss/oxide-wasm32-wasi": "4.1.18",
+        "@tailwindcss/oxide-win32-arm64-msvc": "4.1.18",
+        "@tailwindcss/oxide-win32-x64-msvc": "4.1.18"
+      }
+    },
+    "node_modules/@tailwindcss/oxide-android-arm64": {
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+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
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+      "version": "4.1.18",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-darwin-arm64/-/oxide-darwin-arm64-4.1.18.tgz",
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+      "optional": true,
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+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-darwin-x64/-/oxide-darwin-x64-4.1.18.tgz",
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+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
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+      "engines": {
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+      "optional": true,
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+        "freebsd"
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+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-linux-arm-gnueabihf/-/oxide-linux-arm-gnueabihf-4.1.18.tgz",
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+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
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+      "engines": {
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+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-linux-arm64-gnu/-/oxide-linux-arm64-gnu-4.1.18.tgz",
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+      "optional": true,
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+        "linux"
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+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-linux-arm64-musl/-/oxide-linux-arm64-musl-4.1.18.tgz",
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+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/@tailwindcss/oxide-linux-x64-gnu": {
+      "version": "4.1.18",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-linux-x64-gnu/-/oxide-linux-x64-gnu-4.1.18.tgz",
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+        "x64"
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+      "license": "MIT",
+      "optional": true,
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+        "linux"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
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+      "version": "4.1.18",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-linux-x64-musl/-/oxide-linux-x64-musl-4.1.18.tgz",
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+        "x64"
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+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/@tailwindcss/oxide-wasm32-wasi": {
+      "version": "4.1.18",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-wasm32-wasi/-/oxide-wasm32-wasi-4.1.18.tgz",
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+        "@napi-rs/wasm-runtime",
+        "@emnapi/core",
+        "@emnapi/runtime",
+        "@tybys/wasm-util",
+        "@emnapi/wasi-threads",
+        "tslib"
+      ],
+      "cpu": [
+        "wasm32"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
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+        "@napi-rs/wasm-runtime": "^1.1.0",
+        "@tybys/wasm-util": "^0.10.1",
+        "tslib": "^2.4.0"
+      },
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+        "node": ">=14.0.0"
+      }
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+      "version": "4.1.18",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-win32-arm64-msvc/-/oxide-win32-arm64-msvc-4.1.18.tgz",
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+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/@tailwindcss/oxide-win32-x64-msvc": {
+      "version": "4.1.18",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-win32-x64-msvc/-/oxide-win32-x64-msvc-4.1.18.tgz",
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+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/@tailwindcss/postcss": {
+      "version": "4.1.18",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/postcss/-/postcss-4.1.18.tgz",
+      "integrity": "sha512-Ce0GFnzAOuPyfV5SxjXGn0CubwGcuDB0zcdaPuCSzAa/2vII24JTkH+I6jcbXLb1ctjZMZZI6OjDaLPJQL1S0g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@alloc/quick-lru": "^5.2.0",
+        "@tailwindcss/node": "4.1.18",
+        "@tailwindcss/oxide": "4.1.18",
+        "postcss": "^8.4.41",
+        "tailwindcss": "4.1.18"
+      }
+    },
     "node_modules/@tailwindcss/typography": {
       "version": "0.5.19",
       "resolved": "https://registry.npmjs.org/@tailwindcss/typography/-/typography-0.5.19.tgz",
@@ -3697,13 +3968,6 @@
         "url": "https://github.com/chalk/ansi-styles?sponsor=1"
       }
     },
-    "node_modules/any-promise": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/any-promise/-/any-promise-1.3.0.tgz",
-      "integrity": "sha512-7UvmKalWRt1wgjL1RrGxoSJW/0QZFIegpeGvZG9kjp8vrRu55XTHbwnqq2GpXm9uLbcuhxm3IqX9OB4MZR1b2A==",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/anymatch": {
       "version": "3.1.3",
       "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.3.tgz",
@@ -3717,13 +3981,6 @@
         "node": ">= 8"
       }
     },
-    "node_modules/arg": {
-      "version": "5.0.2",
-      "resolved": "https://registry.npmjs.org/arg/-/arg-5.0.2.tgz",
-      "integrity": "sha512-PYjyFOLKQ9y57JvQ6QLo8dAgNqswh8M1RMJYdQduT6xbWSgK36P/Z/v+p888pM69jMMfS8Xd8F6I1kQ/I9HUGg==",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/argparse": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-2.0.1.tgz",
@@ -3933,43 +4190,6 @@
         "node": ">= 0.4"
       }
     },
-    "node_modules/autoprefixer": {
-      "version": "10.4.24",
-      "resolved": "https://registry.npmjs.org/autoprefixer/-/autoprefixer-10.4.24.tgz",
-      "integrity": "sha512-uHZg7N9ULTVbutaIsDRoUkoS8/h3bdsmVJYZ5l3wv8Cp/6UIIoRDm90hZ+BwxUj/hGBEzLxdHNSKuFpn8WOyZw==",
-      "dev": true,
-      "funding": [
-        {
-          "type": "opencollective",
-          "url": "https://opencollective.com/postcss/"
-        },
-        {
-          "type": "tidelift",
-          "url": "https://tidelift.com/funding/github/npm/autoprefixer"
-        },
-        {
-          "type": "github",
-          "url": "https://github.com/sponsors/ai"
-        }
-      ],
-      "license": "MIT",
-      "dependencies": {
-        "browserslist": "^4.28.1",
-        "caniuse-lite": "^1.0.30001766",
-        "fraction.js": "^5.3.4",
-        "picocolors": "^1.1.1",
-        "postcss-value-parser": "^4.2.0"
-      },
-      "bin": {
-        "autoprefixer": "bin/autoprefixer"
-      },
-      "engines": {
-        "node": "^10 || ^12 || >=14"
-      },
-      "peerDependencies": {
-        "postcss": "^8.1.0"
-      }
-    },
     "node_modules/available-typed-arrays": {
       "version": "1.0.7",
       "resolved": "https://registry.npmjs.org/available-typed-arrays/-/available-typed-arrays-1.0.7.tgz",
@@ -4186,16 +4406,6 @@
         "tslib": "^2.0.3"
       }
     },
-    "node_modules/camelcase-css": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/camelcase-css/-/camelcase-css-2.0.1.tgz",
-      "integrity": "sha512-QOSvevhslijgYwRx6Rv7zKdMF8lbRmx+uQGx2+vDc+KI/eBnsy9kit5aj23AgGu3pa4t9AgwbnXWqS+iOY+2aA==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">= 6"
-      }
-    },
     "node_modules/camelize": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/camelize/-/camelize-1.0.1.tgz",
@@ -4411,16 +4621,6 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
-    "node_modules/commander": {
-      "version": "4.1.1",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-4.1.1.tgz",
-      "integrity": "sha512-NOKm8xhkzAjzFx8B2v5OAHT+u5pRQc2UCa2Vq9jYL/31o2wi9mxBA7LIFs3sV5VSC49z6pEhfbMULvShKj26WA==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">= 6"
-      }
-    },
     "node_modules/comment-json": {
       "version": "4.5.1",
       "resolved": "https://registry.npmjs.org/comment-json/-/comment-json-4.5.1.tgz",
@@ -4724,8 +4924,8 @@
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/detect-libc/-/detect-libc-2.1.2.tgz",
       "integrity": "sha512-Btj2BOOO83o3WyH59e8MgXsxEQVcarkUOpEYrubB0urwnN10yQ364rsiByU11nZlqWYZm05i/of7io4mzihBtQ==",
+      "devOptional": true,
       "license": "Apache-2.0",
-      "optional": true,
       "engines": {
         "node": ">=8"
       }
@@ -4743,20 +4943,6 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
-    "node_modules/didyoumean": {
-      "version": "1.2.2",
-      "resolved": "https://registry.npmjs.org/didyoumean/-/didyoumean-1.2.2.tgz",
-      "integrity": "sha512-gxtyfqMg7GKyhQmb056K7M3xszy/myH8w+B4RT+QXBQsvAOdc3XymqDDPHx1BgPgsdAA5SIifona89YtRATDzw==",
-      "dev": true,
-      "license": "Apache-2.0"
-    },
-    "node_modules/dlv": {
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-      "integrity": "sha512-oPtTM4oerL+UXmx+93ytZVN82RrlY/wPUV8IeDxFrzIjXOLF1pN+EmKPLbubvKHT2HC20xXsCAH2Z+CKV6Oz/g==",
-      "dev": true,
-      "funding": [
-        {
-          "type": "opencollective",
-          "url": "https://opencollective.com/postcss/"
-        },
-        {
-          "type": "github",
-          "url": "https://github.com/sponsors/ai"
-        }
-      ],
-      "license": "MIT",
-      "dependencies": {
-        "lilconfig": "^3.1.1"
-      },
-      "engines": {
-        "node": ">= 18"
-      },
-      "peerDependencies": {
-        "jiti": ">=1.21.0",
-        "postcss": ">=8.0.9",
-        "tsx": "^4.8.1",
-        "yaml": "^2.4.2"
-      },
-      "peerDependenciesMeta": {
-        "jiti": {
-          "optional": true
-        },
-        "postcss": {
-          "optional": true
-        },
-        "tsx": {
-          "optional": true
-        },
-        "yaml": {
-          "optional": true
-        }
-      }
-    },
-    "node_modules/postcss-nested": {
-      "version": "6.2.0",
-      "resolved": "https://registry.npmjs.org/postcss-nested/-/postcss-nested-6.2.0.tgz",
-      "integrity": "sha512-HQbt28KulC5AJzG+cZtj9kvKB93CFCdLvog1WFLf1D+xmMvPGlBstkpTEZfK5+AN9hfJocyBFCNiqyS48bpgzQ==",
-      "dev": true,
-      "funding": [
-        {
-          "type": "opencollective",
-          "url": "https://opencollective.com/postcss/"
-        },
-        {
-          "type": "github",
-          "url": "https://github.com/sponsors/ai"
-        }
-      ],
-      "license": "MIT",
-      "dependencies": {
-        "postcss-selector-parser": "^6.1.1"
-      },
-      "engines": {
-        "node": ">=12.0"
-      },
-      "peerDependencies": {
-        "postcss": "^8.2.14"
-      }
-    },
-    "node_modules/postcss-nested/node_modules/postcss-selector-parser": {
-      "version": "6.1.2",
-      "resolved": "https://registry.npmjs.org/postcss-selector-parser/-/postcss-selector-parser-6.1.2.tgz",
-      "integrity": "sha512-Q8qQfPiZ+THO/3ZrOrO0cJJKfpYCagtMUkXbnEfmgUjwXg6z/WBeOyS9APBBPCTSiDV+s4SwQGu8yFsiMRIudg==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "cssesc": "^3.0.0",
-        "util-deprecate": "^1.0.2"
-      },
-      "engines": {
-        "node": ">=4"
-      }
-    },
     "node_modules/postcss-selector-parser": {
       "version": "6.0.10",
       "resolved": "https://registry.npmjs.org/postcss-selector-parser/-/postcss-selector-parser-6.0.10.tgz",
@@ -9447,16 +9722,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/read-cache": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/read-cache/-/read-cache-1.0.0.tgz",
-      "integrity": "sha512-Owdv/Ft7IjOgm/i0xvNDZ1LrRANRfew4b2prF3OWMQLxLfu3bS8FVhCsrSCMK4lR56Y9ya+AThoTpDCTxCmpRA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "pify": "^2.3.0"
-      }
-    },
     "node_modules/readdirp": {
       "version": "3.6.0",
       "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-3.6.0.tgz",
@@ -10567,29 +10832,6 @@
         }
       }
     },
-    "node_modules/sucrase": {
-      "version": "3.35.1",
-      "resolved": "https://registry.npmjs.org/sucrase/-/sucrase-3.35.1.tgz",
-      "integrity": "sha512-DhuTmvZWux4H1UOnWMB3sk0sbaCVOoQZjv8u1rDoTV0HTdGem9hkAZtl4JZy8P2z4Bg0nT+YMeOFyVr4zcG5Tw==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@jridgewell/gen-mapping": "^0.3.2",
-        "commander": "^4.0.0",
-        "lines-and-columns": "^1.1.6",
-        "mz": "^2.7.0",
-        "pirates": "^4.0.1",
-        "tinyglobby": "^0.2.11",
-        "ts-interface-checker": "^0.1.9"
-      },
-      "bin": {
-        "sucrase": "bin/sucrase",
-        "sucrase-node": "bin/sucrase-node"
-      },
-      "engines": {
-        "node": ">=16 || 14 >=14.17"
-      }
-    },
     "node_modules/supports-color": {
       "version": "8.1.1",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-8.1.1.tgz",
@@ -10629,91 +10871,24 @@
       }
     },
     "node_modules/tailwindcss": {
-      "version": "3.4.19",
-      "resolved": "https://registry.npmjs.org/tailwindcss/-/tailwindcss-3.4.19.tgz",
-      "integrity": "sha512-3ofp+LL8E+pK/JuPLPggVAIaEuhvIz4qNcf3nA1Xn2o/7fb7s/TYpHhwGDv1ZU3PkBluUVaF8PyCHcm48cKLWQ==",
+      "version": "4.1.18",
+      "resolved": "https://registry.npmjs.org/tailwindcss/-/tailwindcss-4.1.18.tgz",
+      "integrity": "sha512-4+Z+0yiYyEtUVCScyfHCxOYP06L5Ne+JiHhY2IjR2KWMIWhJOYZKLSGZaP5HkZ8+bY0cxfzwDE5uOmzFXyIwxw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/tapable": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/tapable/-/tapable-2.3.0.tgz",
+      "integrity": "sha512-g9ljZiwki/LfxmQADO3dEY1CbpmXT5Hm2fJ+QaGKwSXUylMybePR7/67YW7jOrrvjEgL1Fmz5kzyAjWVWLlucg==",
       "dev": true,
       "license": "MIT",
-      "dependencies": {
-        "@alloc/quick-lru": "^5.2.0",
-        "arg": "^5.0.2",
-        "chokidar": "^3.6.0",
-        "didyoumean": "^1.2.2",
-        "dlv": "^1.1.3",
-        "fast-glob": "^3.3.2",
-        "glob-parent": "^6.0.2",
-        "is-glob": "^4.0.3",
-        "jiti": "^1.21.7",
-        "lilconfig": "^3.1.3",
-        "micromatch": "^4.0.8",
-        "normalize-path": "^3.0.0",
-        "object-hash": "^3.0.0",
-        "picocolors": "^1.1.1",
-        "postcss": "^8.4.47",
-        "postcss-import": "^15.1.0",
-        "postcss-js": "^4.0.1",
-        "postcss-load-config": "^4.0.2 || ^5.0 || ^6.0",
-        "postcss-nested": "^6.2.0",
-        "postcss-selector-parser": "^6.1.2",
-        "resolve": "^1.22.8",
-        "sucrase": "^3.35.0"
-      },
-      "bin": {
-        "tailwind": "lib/cli.js",
-        "tailwindcss": "lib/cli.js"
-      },
       "engines": {
-        "node": ">=14.0.0"
-      }
-    },
-    "node_modules/tailwindcss/node_modules/glob-parent": {
-      "version": "6.0.2",
-      "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-6.0.2.tgz",
-      "integrity": "sha512-XxwI8EOhVQgWp6iDL+3b0r86f4d6AX6zSU55HfB4ydCEuXLXc5FcYeOu+nnGftS4TEju/11rt4KJPTMgbfmv4A==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "is-glob": "^4.0.3"
+        "node": ">=6"
       },
-      "engines": {
-        "node": ">=10.13.0"
-      }
-    },
-    "node_modules/tailwindcss/node_modules/postcss-selector-parser": {
-      "version": "6.1.2",
-      "resolved": "https://registry.npmjs.org/postcss-selector-parser/-/postcss-selector-parser-6.1.2.tgz",
-      "integrity": "sha512-Q8qQfPiZ+THO/3ZrOrO0cJJKfpYCagtMUkXbnEfmgUjwXg6z/WBeOyS9APBBPCTSiDV+s4SwQGu8yFsiMRIudg==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "cssesc": "^3.0.0",
-        "util-deprecate": "^1.0.2"
-      },
-      "engines": {
-        "node": ">=4"
-      }
-    },
-    "node_modules/thenify": {
-      "version": "3.3.1",
-      "resolved": "https://registry.npmjs.org/thenify/-/thenify-3.3.1.tgz",
-      "integrity": "sha512-RVZSIV5IG10Hk3enotrhvz0T9em6cyHBLkH/YAZuKqd8hRkKhSfCGIcP2KUY0EPxndzANBmNllzWPwak+bheSw==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "any-promise": "^1.0.0"
-      }
-    },
-    "node_modules/thenify-all": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/thenify-all/-/thenify-all-1.6.0.tgz",
-      "integrity": "sha512-RNxQH/qI8/t3thXJDwcstUO4zeqo64+Uy/+sNVRBx4Xn2OX+OZ9oP+iJnNFqplFra2ZUVeKCSa2oVWi3T4uVmA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "thenify": ">= 3.1.0 < 4"
-      },
-      "engines": {
-        "node": ">=0.8"
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/webpack"
       }
     },
     "node_modules/thingies": {
@@ -10863,13 +11038,6 @@
         "typescript": ">=4.8.4"
       }
     },
-    "node_modules/ts-interface-checker": {
-      "version": "0.1.13",
-      "resolved": "https://registry.npmjs.org/ts-interface-checker/-/ts-interface-checker-0.1.13.tgz",
-      "integrity": "sha512-Y/arvbn+rrz3JCKl9C4kVNfTfSm2/mEp5FSz5EsZSANGPSlQrpRI5M4PKF+mJnE52jOO90PnPSc3Ur3bTQw0gA==",
-      "dev": true,
-      "license": "Apache-2.0"
-    },
     "node_modules/ts-pattern": {
       "version": "5.9.0",
       "resolved": "https://registry.npmjs.org/ts-pattern/-/ts-pattern-5.9.0.tgz",
diff --git a/package.json b/package.json
index 9ddb98f..d941b8c 100644
--- a/package.json
+++ b/package.json
@@ -38,17 +38,17 @@
     "unist-util-visit": "^5.0.0"
   },
   "devDependencies": {
+    "@tailwindcss/postcss": "^4.1.18",
     "@tailwindcss/typography": "^0.5.19",
     "@types/node": "^24.10.1",
     "@types/react": "^19.2.5",
     "@types/react-dom": "^19.2.3",
-    "autoprefixer": "^10.4.22",
     "concurrently": "^9.2.1",
     "eslint": "^9.39.1",
     "eslint-config-next": "^16.0.3",
     "pagefind": "^1.4.0",
     "postcss": "^8.5.6",
-    "tailwindcss": "^3.4.18",
+    "tailwindcss": "^4.1.18",
     "typescript": "^5.9.3"
   }
 }
diff --git a/postcss.config.cjs b/postcss.config.cjs
deleted file mode 100644
index 12a703d..0000000
--- a/postcss.config.cjs
+++ /dev/null
@@ -1,6 +0,0 @@
-module.exports = {
-  plugins: {
-    tailwindcss: {},
-    autoprefixer: {},
-  },
-};
diff --git a/postcss.config.mjs b/postcss.config.mjs
new file mode 100644
index 0000000..a34a3d5
--- /dev/null
+++ b/postcss.config.mjs
@@ -0,0 +1,5 @@
+export default {
+  plugins: {
+    '@tailwindcss/postcss': {},
+  },
+};
diff --git a/styles/globals.css b/styles/globals.css
index 9cb8570..20dad88 100644
--- a/styles/globals.css
+++ b/styles/globals.css
@@ -1,6 +1,50 @@
-@tailwind base;
-@tailwind components;
-@tailwind utilities;
+@import "tailwindcss";
+@plugin "@tailwindcss/typography";
+
+/* Class-based dark mode for next-themes */
+@custom-variant dark (&:where(.dark, .dark *));
+
+/* Auto-detect content in the submodule */
+@source "../content";
+
+/* Tailwind v4 CSS-first theme configuration */
+@theme {
+  /* Custom colors (CSS variable references) */
+  --color-accent: var(--color-accent);
+  --color-accent-soft: var(--color-accent-soft);
+  --color-accent-textLight: var(--color-accent-text-light);
+  --color-accent-textDark: var(--color-accent-text-dark);
+
+  /* Custom font families */
+  --font-serif-eng: var(--font-serif-eng), serif;
+  --font-serif-cn: "Songti SC", "Noto Serif TC", "SimSun", serif;
+
+  /* Custom transition timing */
+  --ease-snappy: cubic-bezier(0.32, 0.72, 0, 1);
+
+  /* Custom transition durations */
+  --duration-180: 180ms;
+  --duration-260: 260ms;
+
+  /* Custom box shadows */
+  --shadow-lifted: 0 12px 30px -14px rgba(15, 23, 42, 0.25);
+  --shadow-outline: 0 0 0 1px rgba(59, 130, 246, 0.25);
+
+  /* Custom keyframes */
+  --animate-fade-in-up: fade-in-up 0.6s ease-out both;
+  --animate-float-soft: float-soft 12s ease-in-out infinite;
+}
+
+@keyframes fade-in-up {
+  0% { opacity: 0; transform: translateY(8px) scale(0.98); }
+  100% { opacity: 1; transform: translateY(0) scale(1); }
+}
+
+@keyframes float-soft {
+  0% { transform: translate3d(0,0,0) scale(1); }
+  50% { transform: translate3d(4px,-6px,0) scale(1.03); }
+  100% { transform: translate3d(0,0,0) scale(1); }
+}
 
 :root {
   --motion-duration-short: 180ms;
@@ -129,7 +173,7 @@ body {
 }
 
 .prose blockquote::before {
-  content: '“';
+  content: '\201C';
   position: absolute;
   top: 0.5rem;
   left: 0.8rem;
@@ -147,22 +191,45 @@ body {
   @apply -translate-y-0.5 shadow-md;
 }
 
+/* Typography plugin prose overrides */
 .prose {
   font-size: clamp(1rem, 0.2vw + 0.9rem, 1.2rem);
   line-height: var(--line-height-body);
   color: var(--color-ink-body);
 }
 
+.prose a {
+  color: var(--color-accent-text-light);
+}
+
+.prose a:hover {
+  color: var(--color-accent);
+}
+
+.dark .prose a {
+  color: var(--color-accent-text-dark);
+}
+
+.dark .prose a:hover {
+  color: var(--color-accent);
+}
+
 .prose h1 {
   font-size: clamp(2.2rem, 1.4rem + 2.2vw, 3.4rem);
   line-height: 1.25;
   color: var(--color-ink-strong);
+  font-weight: 700;
+  letter-spacing: -0.03em;
+  font-family: var(--font-serif-eng), "Songti SC", serif;
 }
 
 .prose h2 {
   font-size: clamp(1.8rem, 1.1rem + 1.6vw, 2.8rem);
   line-height: 1.3;
   color: var(--color-ink-strong);
+  font-weight: 600;
+  letter-spacing: -0.02em;
+  font-family: var(--font-serif-eng), "Songti SC", serif;
 }
 
 .prose h3 {
@@ -183,6 +250,26 @@ body {
   font-size: clamp(0.85rem, 0.2vw + 0.8rem, 0.95rem);
 }
 
+/* Dark mode prose overrides (replaces prose-dark) */
+.dark .prose {
+  color: var(--color-ink-body);
+}
+
+.dark .prose strong,
+.dark .prose b {
+  color: #f8fafc;
+  font-weight: 700;
+}
+
+.dark .prose em {
+  color: #f1f5f9;
+}
+
+.dark .prose h1,
+.dark .prose h2 {
+  color: #f8fafc;
+}
+
 .prose h1>a,
 .prose h2>a,
 .prose h3>a,
diff --git a/tailwind.config.cjs b/tailwind.config.cjs
deleted file mode 100644
index 74b799a..0000000
--- a/tailwind.config.cjs
+++ /dev/null
@@ -1,126 +0,0 @@
-/** @type {import('tailwindcss').Config} */
-module.exports = {
-  darkMode: 'class',
-  content: [
-    "./app/**/*.{ts,tsx}",
-    "./components/**/*.{ts,tsx}",
-    "./content/**/*.{md,mdx}"
-  ],
-  theme: {
-    extend: {
-      colors: {
-        accent: {
-          DEFAULT: 'var(--color-accent)',
-          soft: 'var(--color-accent-soft)',
-          textLight: 'var(--color-accent-text-light)',
-          textDark: 'var(--color-accent-text-dark)'
-        }
-      },
-      fontFamily: {
-        'serif-eng': ['var(--font-serif-eng)', 'serif'],
-        'serif-cn': ['"Songti SC"', '"Noto Serif TC"', '"SimSun"', 'serif'],
-      },
-      transitionTimingFunction: {
-        snappy: 'cubic-bezier(0.32, 0.72, 0, 1)'
-      },
-      transitionDuration: {
-        180: '180ms',
-        260: '260ms'
-      },
-      boxShadow: {
-        lifted: '0 12px 30px -14px rgba(15, 23, 42, 0.25)',
-        outline: '0 0 0 1px rgba(59, 130, 246, 0.25)'
-      },
-      keyframes: {
-        'fade-in-up': {
-          '0%': { opacity: '0', transform: 'translateY(8px) scale(0.98)' },
-          '100%': { opacity: '1', transform: 'translateY(0) scale(1)' }
-        },
-        'float-soft': {
-          '0%': { transform: 'translate3d(0,0,0) scale(1)' },
-          '50%': { transform: 'translate3d(4px,-6px,0) scale(1.03)' },
-          '100%': { transform: 'translate3d(0,0,0) scale(1)' }
-        }
-      },
-      animation: {
-        'fade-in-up': 'fade-in-up 0.6s ease-out both',
-        'float-soft': 'float-soft 12s ease-in-out infinite'
-      },
-      typography: (theme) => ({
-        DEFAULT: {
-          css: {
-            color: theme('colors.slate.700'),
-            a: {
-              color: 'var(--color-accent-text-light)',
-              '&:hover': {
-                color: 'var(--color-accent)'
-              }
-            },
-            h1: {
-              fontWeight: '700',
-              letterSpacing: '-0.03em',
-              fontFamily: 'var(--font-serif-eng), "Songti SC", serif',
-            },
-            h2: {
-              fontWeight: '600',
-              letterSpacing: '-0.02em',
-              fontFamily: 'var(--font-serif-eng), "Songti SC", serif',
-            },
-            blockquote: {
-              fontStyle: 'normal',
-              borderLeftColor: 'var(--color-accent-soft)',
-              color: theme('colors.slate.700'),
-              backgroundColor: theme('colors.slate.50')
-            },
-            code: {
-              backgroundColor: theme('colors.slate.100'),
-              padding: '0.15rem 0.35rem',
-              borderRadius: '0.25rem'
-            }
-          }
-        },
-        dark: {
-          css: {
-            // Slightly softer than pure white for body text
-            color: theme('colors.slate.200'),
-            a: {
-              color: 'var(--color-accent-text-dark)',
-              '&:hover': {
-                color: 'var(--color-accent)'
-              }
-            },
-            strong: {
-              color: theme('colors.slate.50'),
-              fontWeight: '700'
-            },
-            b: {
-              color: theme('colors.slate.50'),
-              fontWeight: '700'
-            },
-            em: {
-              color: theme('colors.slate.100')
-            },
-            h1: {
-              color: theme('colors.slate.50')
-            },
-            h2: {
-              color: theme('colors.slate.50')
-            },
-            blockquote: {
-              borderLeftColor: 'var(--color-accent)',
-              backgroundColor: theme('colors.slate.800'),
-              color: theme('colors.slate.200'),
-              p: {
-                color: theme('colors.slate.200')
-              }
-            },
-            code: {
-              backgroundColor: theme('colors.slate.800')
-            }
-          }
-        }
-      })
-    },
-  },
-  plugins: [require('@tailwindcss/typography')],
-};