diff --git a/build_html.py b/build_html.py
index d33c45f..8c165ca 100644
--- a/build_html.py
+++ b/build_html.py
@@ -27,7 +27,7 @@ CSS = """
       padding: 3rem 2rem 6rem;
     }
 
-    h1 { font-size: 2.4rem; margin-bottom: 0.2rem; line-height: 1; }
+    h1 { font-size: 2.4rem; margin-bottom: 1.2rem; line-height: 1; }
 
     a.title-btn {
       display: inline-block;
@@ -126,6 +126,8 @@ CSS = """
       width: 100%;
       margin: 1.2rem 0;
       font-size: 0.93em;
+      display: block;
+      overflow-x: auto;
     }
     th {
       background: #f0f0f0;
@@ -205,6 +207,12 @@ CSS = """
       text-decoration: none;
     }
     .site-header nav a:hover { color: #6366f1; text-decoration: none; }
+
+    @media (max-width: 600px) {
+      .site-header-inner { padding: 0.6rem 1rem; gap: 0.8rem; }
+      .site-header .header-tagline { display: none; }
+      .site-header nav { gap: 0.8rem; }
+    }
 """
 
 HEADER = """