diff --git a/static/style.css b/static/style.css
new file mode 100644
index 0000000..e5ef494
--- /dev/null
+++ b/static/style.css
@@ -0,0 +1,167 @@
+*, *::before, *::after { box-sizing: border-box; }
+
+body {
+  font-family: monospace;
+  max-width: 720px;
+  margin: 0 auto;
+  padding: 20px;
+  color: #222;
+  background: #fff;
+  line-height: 1.5;
+}
+
+a { color: inherit; }
+
+/* Header */
+header {
+  display: flex;
+  justify-content: space-between;
+  align-items: baseline;
+  border-bottom: 1px solid #ccc;
+  padding-bottom: 8px;
+  margin-bottom: 28px;
+}
+
+.site-title {
+  font-weight: bold;
+  text-decoration: none;
+  font-size: 1.1em;
+}
+
+nav {
+  display: flex;
+  gap: 14px;
+  font-size: 0.88em;
+}
+
+nav a { text-decoration: none; }
+nav a:hover { text-decoration: underline; }
+
+.user-email { color: #666; }
+
+/* Diary entries */
+.entry {
+  display: flex;
+  gap: 14px;
+  padding: 14px 0;
+  border-bottom: 1px solid #eee;
+}
+
+.poster {
+  width: 60px;
+  flex-shrink: 0;
+}
+
+.poster img {
+  width: 100%;
+  display: block;
+  border: 1px solid #ddd;
+}
+
+.entry-body { flex: 1; }
+
+.entry-title {
+  font-weight: bold;
+  margin-bottom: 2px;
+}
+
+.year { color: #666; font-weight: normal; }
+
+.director {
+  color: #666;
+  font-size: 0.88em;
+  margin-bottom: 2px;
+}
+
+.rating {
+  font-size: 0.88em;
+  margin-bottom: 2px;
+}
+
+.comment {
+  font-style: italic;
+  color: #444;
+  font-size: 0.9em;
+  margin-bottom: 2px;
+}
+
+.watched-at {
+  font-size: 0.8em;
+  color: #888;
+}
+
+.empty { color: #999; margin-top: 20px; }
+
+/* Pagination */
+.pagination {
+  margin-top: 24px;
+  display: flex;
+  gap: 20px;
+  font-size: 0.9em;
+}
+
+.pagination a { text-decoration: none; }
+.pagination a:hover { text-decoration: underline; }
+
+/* Forms */
+h1 { font-size: 1.2em; margin-bottom: 20px; }
+
+form {
+  max-width: 400px;
+}
+
+form label {
+  display: block;
+  margin-bottom: 14px;
+  font-size: 0.9em;
+}
+
+form input[type="text"],
+form input[type="email"],
+form input[type="password"],
+form input[type="number"],
+form input[type="datetime-local"],
+form textarea {
+  display: block;
+  width: 100%;
+  font-family: monospace;
+  font-size: 1em;
+  margin-top: 3px;
+  padding: 5px 6px;
+  border: 1px solid #bbb;
+  border-radius: 0;
+  background: #fff;
+  color: #222;
+}
+
+form textarea {
+  height: 80px;
+  resize: vertical;
+}
+
+form hr {
+  border: none;
+  border-top: 1px solid #eee;
+  margin: 18px 0;
+}
+
+form button[type="submit"] {
+  font-family: monospace;
+  font-size: 1em;
+  padding: 6px 18px;
+  cursor: pointer;
+  background: #222;
+  color: #fff;
+  border: none;
+}
+
+form button[type="submit"]:hover { background: #444; }
+
+.optional { color: #888; font-size: 0.85em; }
+
+/* Errors */
+.error {
+  color: #c00;
+  margin-bottom: 16px;
+  font-size: 0.9em;
+}