Add custom fonts with iA Writer Quattro S and Noto Sans SC

assets/css/custom.css

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+/* ===== Custom Fonts ===== */
+
+/* iA Writer Quattro S — self-hosted */
+@font-face {
+    font-family: "iA Writer Quattro S";
+    src: url("/fonts/iAWriterQuattroSRegular.ttf") format("truetype");
+    font-weight: 400;
+    font-style: normal;
+    font-display: swap;
+}
+
+/* Global font stack: English → Chinese → system fallback */
+html,
+body {
+    font-family: "iA Writer Quattro S", "Noto Sans SC", sans-serif;
+}
+
+/* Code blocks keep monospace */
+code,
+pre,
+kbd {
+    font-family:
+        "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", "Noto Sans SC",
+        monospace;
+}

layouts/_partials/custom/head-end.html

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+<!-- Custom fonts -->
+<link rel="preconnect" href="https://fonts.googleapis.com">
+<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+<link href="https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;700&display=swap" rel="stylesheet">