fix(terminal): simplify layout and fix box alignment

- remove ASCII art logo, use styled text header instead
- fix box_top width calculation for titled boxes
- add note about character width gotchas to blog post
- add new hero image for terminal UI blog post

src/content/blog/terminal-ui-cloudflare-rust.mdx

@@ -2,7 +2,7 @@
 title: "Building a Terminal UI for Your Website with Rust and Cloudflare Workers"
 description: "How we built a curl-able ANSI terminal interface for nicholai.work using Rust compiled to WebAssembly, running on Cloudflare's edge network. Browsers get the normal site, terminals get ASCII art."
 pubDate: 2026-01-20
-heroImage: "../../assets/workbench.avif"
+heroImage: "../../assets/curl-terminal.png"
 featured: true
 category: "Development"
 tags: ["Rust", "Cloudflare Workers", "WebAssembly", "Terminal UI", "Edge Computing"]
@@ -117,6 +117,12 @@ combine these with color codes and you get clean, bordered sections:
 └──────────────────────────────────────────────┘
 ```
 
+### a note on character widths
+
+we learned this the hard way: **full-block characters (`█`) and double-line box drawing (`╔`, `║`, `═`) have inconsistent display widths across terminals**. some terminals render them as double-width, others as single-width. this causes alignment issues.
+
+the solution: use single-line box drawing characters (`┌`, `─`, `│`) for borders - they're reliably single-width everywhere. if you want ASCII art logos, half-block characters (`▄`, `▀`) are also safe. we ended up ditching the fancy ASCII art logo entirely and going with styled text, which works perfectly across all terminals.
+
 ## the worker entry point
 
 the cloudflare `worker` crate provides macros for handling requests:

worker/src/terminal/layout.rs

@@ -21,20 +21,25 @@ pub fn horizontal_line(width: usize) -> String {
 
 /// Render a box top border with optional title
 pub fn box_top(width: usize, title: Option<&str>) -> String {
-    let inner_width = width - 2;
+    let inner_width = width - 2; // subtract corners
 
     match title {
         Some(t) => {
-            let title_colored = color(&format!(" {} ", t), Colors::RED);
-            let title_len = t.len() + 2; // account for spaces
-            let line_len = inner_width.saturating_sub(title_len);
-            dim(&format!(
-                "{}{}{}{}",
-                Box::TOP_LEFT,
-                Box::HORIZONTAL,
-                title_colored,
-                format!("{}{}", dim(&horizontal_line(line_len)), dim(&Box::TOP_RIGHT.to_string()))
-            ))
+            // Title format: ┌─ Title ───────┐
+            // We need: corner + dash + space + title + space + dashes + corner
+            let title_display = format!(" {} ", t);
+            let title_visible_len = title_display.len(); // all ASCII, so len() works
+            // Subtract: 1 for the dash before title, title_visible_len for title
+            let remaining_dashes = inner_width.saturating_sub(1 + title_visible_len);
+
+            format!(
+                "{}{}{}{}{}",
+                dim(&Box::TOP_LEFT.to_string()),
+                dim(&Box::HORIZONTAL.to_string()),
+                color(&title_display, Colors::RED),
+                dim(&horizontal_line(remaining_dashes)),
+                dim(&Box::TOP_RIGHT.to_string())
+            )
         }
         None => dim(&format!(
             "{}{}{}",
@@ -74,7 +79,8 @@ pub fn box_empty(width: usize) -> String {
     box_row("", width)
 }
 
-/// Strip ANSI codes and return visible length
+/// Strip ANSI codes and return visible display width
+/// Accounts for double-width unicode characters (block chars, CJK, etc)
 fn strip_ansi_len(s: &str) -> usize {
     let mut len = 0;
     let mut in_escape = false;
@@ -87,13 +93,40 @@ fn strip_ansi_len(s: &str) -> usize {
                 in_escape = false;
             }
         } else {
-            len += 1;
+            len += char_width(c);
         }
     }
 
     len
 }
 
+/// Get the display width of a character
+/// Half-blocks are single-width, full-blocks vary by terminal
+pub fn char_width(c: char) -> usize {
+    match c {
+        // Half-block characters - reliably single-width
+        '▀' | '▄' | '▌' | '▐' => 1,
+        // Single-line box drawing (what we use for borders) - single width
+        '┌' | '┐' | '└' | '┘' | '│' | '─' | '├' | '┤' | '┬' | '┴' | '┼' => 1,
+        // Most other characters are single width
+        _ => 1,
+    }
+}
+
+/// Get display width of a string (accounting for ANSI codes and double-width chars)
+pub fn display_width(s: &str) -> usize {
+    strip_ansi_len(s)
+}
+
+/// Pad a string with spaces on the right to reach target display width
+pub fn pad_to_width(text: &str, target_width: usize) -> String {
+    let current_width = display_width(text);
+    if current_width >= target_width {
+        return text.to_string();
+    }
+    format!("{}{}", text, " ".repeat(target_width - current_width))
+}
+
 /// Center text within a given width
 pub fn center(text: &str, width: usize) -> String {
     let visible_len = strip_ansi_len(text);

worker/src/terminal/renderer.rs

@@ -2,15 +2,7 @@ use super::colors::{bold_color, color, dim, Colors};
 use super::content::{Experience, NavItem, SiteContent, Skill, EXPERIENCES, NAV_ITEMS, SKILLS};
 use super::layout::{box_bottom, box_empty, box_row, box_top, center};
 
-const WIDTH: usize = 67;
-
-/// ASCII art logo for "VISUAL ALCHEMIST"
-const LOGO: &str = r#"██╗   ██╗██╗███████╗██╗   ██╗ █████╗ ██╗
-██║   ██║██║██╔════╝██║   ██║██╔══██╗██║
-██║   ██║██║███████╗██║   ██║███████║██║
-╚██╗ ██╔╝██║╚════██║██║   ██║██╔══██║██║
- ╚████╔╝ ██║███████║╚██████╔╝██║  ██║███████╗
-  ╚═══╝  ╚═╝╚══════╝ ╚═════╝ ╚═╝  ╚═╝╚══════╝"#;
+const WIDTH: usize = 78;
 
 /// Render the complete terminal UI
 pub fn render() -> String {
@@ -36,14 +28,11 @@ fn render_header() -> String {
     lines.push(box_top(WIDTH, None));
     lines.push(box_empty(WIDTH));
 
-    // Logo
-    for line in LOGO.lines() {
-        let centered = center(&color(line, Colors::RED), WIDTH - 4);
-        lines.push(box_row(&centered, WIDTH));
-    }
-
-    // Subtitle
-    lines.push(box_row(&center(&bold_color("ALCHEMIST", Colors::RED), WIDTH - 4), WIDTH));
+    // Title
+    lines.push(box_row(
+        &center(&bold_color("VISUAL ALCHEMIST", Colors::RED), WIDTH - 4),
+        WIDTH,
+    ));
     lines.push(box_empty(WIDTH));
 
     // Name and title