diff --git a/public/styles.css b/public/styles.css
index d0d58c0..1110c93 100755
--- a/public/styles.css
+++ b/public/styles.css
@@ -3,12 +3,13 @@ body { margin: 0; background: var(--bg); color: var(--fg); font-family: system-u
 .topbar { position: fixed; top: 0; left: 0; right: 0; height: 48px; display: flex; align-items: center; gap: 1em; background: #111; padding: 0 1em; z-index: 100; box-shadow: 0 2px 8px rgba(0,0,0,.3); }
 .topbar a { color: var(--accent); text-decoration: none; }
 .topbar button { font-size: 20px; background: transparent; color: var(--fg); border: 1px solid var(--line); border-radius: 8px; padding: 4px 8px; }
-.sidebar { position: fixed; top: 48px; bottom: 0; width: 280px; overflow: auto; background: #111; transition: .3s; transform: translateX(-100%); padding: 10px; }
+.sidebar { position: fixed; top: 48px; bottom: 0; width: 85%; max-width: 320px; overflow: auto; background: #111; transition: .3s; transform: translateX(-100%); padding: 10px; }
 .sidebar.open { transform: translateX(0); }
 .overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 99; }
 .sidebar.open ~ .overlay { display: block; }
 .content { margin-top: 48px; padding: 16px; }
-@media (min-width: 900px) { .sidebar { transform: none; position: static; height: calc(100vh - 48px); } .content { margin-left: 280px; } }
+@media (min-width: 900px) { .sidebar { transform: none; position: static; width: 280px; height: calc(100vh - 48px); } .content { margin-left: 280px; } }
+@media (max-width: 900px) { .viewer { padding: 12px; font-size: 1.05em; line-height: 1.6; } #htmlView, #mdView { min-height: calc(100vh - 60px); } }
 .viewer { height: calc(100vh - 80px); overflow: auto; max-width: 820px; margin: 0 auto; }
 #htmlView { width: 100%; height: 100%; border: none; background: #0b0c10; }
 #mdView h1, #mdView h2, #mdView h3 { color: var(--accent); }