diff --git a/.shellcheckrc b/.shellcheckrc
new file mode 100644
index 0000000..e70c898
--- /dev/null
+++ b/.shellcheckrc
@@ -0,0 +1 @@
+disable=SC2034,SC2154
diff --git a/Makefile b/Makefile
index 3386e44..a281bdd 100644
--- a/Makefile
+++ b/Makefile
@@ -20,4 +20,10 @@ uninstall:
 clean:
 	rm -f kewt
 
-.PHONY: all install uninstall clean
+test:
+	sh tests/test_runner.sh
+
+shellcheck:
+	shellcheck kewt.sh markdown.sh lib/*.sh
+
+.PHONY: all install uninstall clean test shellcheck
diff --git a/awk/reference_links.awk b/awk/reference_links.awk
new file mode 100644
index 0000000..9a08a88
--- /dev/null
+++ b/awk/reference_links.awk
@@ -0,0 +1,119 @@
+{
+    lines[NR] = $0
+    total = NR
+
+    if (/^\[[^\]]+\]:  */) {
+        line = $0
+        sub(/^\[/, "", line)
+        ref_id = line
+        sub(/\].*/, "", ref_id)
+
+        line = $0
+        sub(/^\[[^\]]+\]:  */, "", line)
+        ref_url = line
+        sub(/[ \t].*/, "", ref_url)
+
+        ref_title = $0
+        sub(/^\[[^\]]+\]:  *[^\t ]*[ \t]*/, "", ref_title)
+        sub(/^"/, "", ref_title)
+        sub(/"$/, "", ref_title)
+        gsub(/\|/, "!", ref_title)
+
+        refs[ref_id] = ref_url
+        if (ref_title != "") titles[ref_id] = ref_title
+        is_ref[NR] = 1
+    }
+}
+
+function resolve_image_ref(alt, id,    url, title) {
+    url = refs[id]
+    title = (id in titles) ? titles[id] : ""
+    if (url == "") return "![" alt "][" id "]"
+    return "<img src=\"" url "\" title=\"" title "\" alt=\"" alt "\" />"
+}
+
+function resolve_link_ref(text, id,    url, title) {
+    url = refs[id]
+    title = (id in titles) ? titles[id] : ""
+    if (url == "") return "[" text "][" id "]"
+    return "<a href=\"" url "\" title=\"" title "\">" text "</a>"
+}
+
+function process_refs(line,    result, i, len, ch, j, k, depth, bracket_content, ref_id) {
+    result = ""
+    len = length(line)
+    i = 1
+
+    while (i <= len) {
+        ch = substr(line, i, 1)
+
+        if (ch == "!" && i < len && substr(line, i + 1, 1) == "[") {
+            bracket_content = ""
+            j = i + 2
+            while (j <= len && substr(line, j, 1) != "]") {
+                bracket_content = bracket_content substr(line, j, 1)
+                j++
+            }
+            if (j <= len && j < len && substr(line, j + 1, 1) == "[") {
+                k = j + 2
+                ref_id = ""
+                while (k <= len && substr(line, k, 1) != "]") {
+                    ref_id = ref_id substr(line, k, 1)
+                    k++
+                }
+                if (k <= len) {
+                    if (ref_id == "") ref_id = bracket_content
+                    if (ref_id in refs) {
+                        result = result resolve_image_ref(bracket_content, ref_id)
+                        i = k + 1
+                        continue
+                    }
+                }
+            }
+            result = result substr(line, i, 1)
+            i++
+        } else if (ch == "[") {
+            bracket_content = ""
+            j = i + 1
+            depth = 1
+            while (j <= len && depth > 0) {
+                if (substr(line, j, 1) == "[") depth++
+                if (substr(line, j, 1) == "]") {
+                    depth--
+                    if (depth == 0) break
+                }
+                if (depth > 0) bracket_content = bracket_content substr(line, j, 1)
+                j++
+            }
+            if (j <= len && j < len && substr(line, j + 1, 1) == "[") {
+                k = j + 2
+                ref_id = ""
+                while (k <= len && substr(line, k, 1) != "]") {
+                    ref_id = ref_id substr(line, k, 1)
+                    k++
+                }
+                if (k <= len) {
+                    if (ref_id == "") ref_id = bracket_content
+                    if (ref_id in refs) {
+                        result = result resolve_link_ref(bracket_content, ref_id)
+                        i = k + 1
+                        continue
+                    }
+                }
+            }
+            result = result substr(line, i, 1)
+            i++
+        } else {
+            result = result ch
+            i++
+        }
+    }
+    return result
+}
+
+END {
+    for (n = 1; n <= total; n++) {
+        if (is_ref[n]) continue
+        print process_refs(lines[n])
+    }
+}
diff --git a/lib/builder.sh b/lib/builder.sh
index 4b28a4c..565aeb9 100644
--- a/lib/builder.sh
+++ b/lib/builder.sh
@@ -1,4 +1,5 @@
 #!/bin/sh
+# shellcheck disable=SC2129
 
 needs_rebuild() {
     src_file="$1"
@@ -29,65 +30,104 @@ write_content_warning_outputs() {
     generate_content_warning_page "$fm_title" "$fm_content_warning" "$_content_rel_url" "$_target_url" "$_landing_out_file" "false"
 }
 
-build_site() {
-echo "Building site from '$src' to '$out'..."
+build_dir_entries_list() {
+    _bde_dir="$1"
+    _bde_rel_dir="$2"
+    _bde_entries_file="$3"
 
-build_markdown_manifest
-build_full_nav
+    find "$_bde_dir" ! -name "$(basename "$_bde_dir")" -prune ! -name ".*" -print | while read -r entry; do
+        name="${entry##*/}"
+        case "$name" in
+            template.html|site.conf|style.css|styles.root.css|index.md) continue ;;
+        esac
+        if [ -d "$entry" ]; then
+            entry_rel_dir="${entry#"$src"/}"
+            manifest_dir_hidden_by_draft_index "$entry_rel_dir" && continue
+            dir_url="$(encode_url_path "$name")/index.html"
+            echo "${name}|- [${name}/](${dir_url})" >> "$_bde_entries_file"
+        elif [ "${entry%.md}" != "$entry" ]; then
+            entry_rel_path="${entry#"$src"/}"
+            load_manifest_entry "$entry_rel_path" || continue
+            label="${name%.md}"
+            [ "$manifest_draft" = "true" ] && continue
 
-eval "find \"$src\" \( $IGNORE_ARGS \) -prune -o -type d -print" | sort | while read -r dir; do
-    rel_dir="${dir#"$src"}"
-    rel_dir="${rel_dir#/}"
-    [ -z "$rel_dir" ] && rel_dir="."
-    out_dir="$out/$rel_dir"
-    mkdir -p "$out_dir"
+            post_h="$manifest_title"
 
-    if [ -f "$dir/styles.css" ]; then
-        if needs_rebuild "$dir/styles.css" "$out_dir/styles.css"; then
-            copy_style_with_resolved_vars "$dir/styles.css" "$out_dir/styles.css"
+            is_post_entry="false"
+            if is_posts_directory_rel "$_bde_rel_dir"; then
+                is_post_entry="true"
+            fi
+
+            if [ -n "$post_h" ]; then
+                if [ "$is_post_entry" = "true" ]; then
+                    if [ -n "$manifest_post_time" ]; then
+                        label="$post_h - $manifest_post_date $manifest_post_time"
+                    else
+                        label="$post_h - $manifest_post_date"
+                    fi
+                else
+                    label="$post_h"
+                fi
+            elif [ "$is_post_entry" = "true" ]; then
+                if [ -n "$manifest_post_time" ]; then
+                    label="$manifest_post_date $manifest_post_time"
+                else
+                    label="$manifest_post_date"
+                fi
+            fi
+            if [ "$is_post_entry" = "true" ]; then
+                sort_key="${manifest_post_date} ${manifest_post_time}"
+            else
+                sort_key="$name"
+            fi
+            entry_url=$(encode_url_path "${name%.md}.html")
+            echo "${sort_key}|- [$label](${entry_url})|$name|${entry_url}" >> "$_bde_entries_file"
+        else
+            asset_url=$(encode_url_path "$name")
+            echo "${name}|- [$name]($asset_url)|$name|$asset_url" >> "$_bde_entries_file"
         fi
-    elif [ -f "$dir/style.css" ]; then
-        if needs_rebuild "$dir/style.css" "$out_dir/styles.css"; then
-            copy_style_with_resolved_vars "$dir/style.css" "$out_dir/styles.css"
-        fi
-    fi
+    done
+}
 
-    [ "$dir_indexes" != "true" ] && continue
+build_dir_index() {
+    _bdi_dir="$1"
+    _bdi_rel_dir="$2"
+    _bdi_out_dir="$3"
 
     has_custom_index="false"
     has_list="false"
-    if [ -f "$dir/index.md" ]; then
+    if [ -f "$_bdi_dir/index.md" ]; then
         has_custom_index="true"
-        if grep -q '^[[:space:]]*{{LIST}}[[:space:]]*$' "$dir/index.md" 2>/dev/null; then
+        if grep -q '^[[:space:]]*{{LIST}}[[:space:]]*$' "$_bdi_dir/index.md" 2>/dev/null; then
             has_list="true"
         fi
     fi
 
     if [ "$has_custom_index" = "false" ] || [ "$has_list" = "true" ]; then
         is_posts_dir="false"
-        if is_posts_directory_rel "$rel_dir"; then
+        if is_posts_directory_rel "$_bdi_rel_dir"; then
             is_posts_dir="true"
         fi
         if [ "$single_file_index" = "true" ] && [ "$is_posts_dir" = "false" ] && [ "$has_list" = "false" ]; then
-            if load_manifest_dir_entry "$rel_dir" && [ "$dir_md_count" -eq 1 ]; then
+            if load_manifest_dir_entry "$_bdi_rel_dir" && [ "$dir_md_count" -eq 1 ]; then
                 md_file="$src/$dir_first_md"
-                is_home="false"; [ "$dir" = "$src" ] && is_home="true"
-                target_url=$(directory_index_url "$rel_dir")
-                if needs_rebuild "$md_file" "$out_dir/index.html"; then
+                is_home="false"; [ "$_bdi_dir" = "$src" ] && is_home="true"
+                target_url=$(directory_index_url "$_bdi_rel_dir")
+                if needs_rebuild "$md_file" "$_bdi_out_dir/index.html"; then
                     parse_frontmatter "$md_file"
                     if [ -n "$fm_content_warning" ]; then
-                        content_out_file="$out_dir/content.html"
-                        if [ "$rel_dir" = "." ]; then
+                        content_out_file="$_bdi_out_dir/content.html"
+                        if [ "$_bdi_rel_dir" = "." ]; then
                             content_rel_url="/content.html"
                         else
-                            content_rel_url="/$(encode_url_path "$rel_dir")/content.html"
+                            content_rel_url="/$(encode_url_path "$_bdi_rel_dir")/content.html"
                         fi
-                        write_content_warning_outputs "$md_file" "$content_out_file" "$content_rel_url" "$target_url" "$out_dir/index.html" "$is_home"
+                        write_content_warning_outputs "$md_file" "$content_out_file" "$content_rel_url" "$target_url" "$_bdi_out_dir/index.html" "$is_home"
                     else
-                        render_markdown "$md_file" "$is_home" "$target_url" > "$out_dir/index.html"
+                        render_markdown "$md_file" "$is_home" "$target_url" > "$_bdi_out_dir/index.html"
                     fi
                 fi
-                continue
+                return 0
             fi
         fi
 
@@ -96,74 +136,21 @@ eval "find \"$src\" \( $IGNORE_ARGS \) -prune -o -type d -print" | sort | while
         : > "$temp_list"
 
         if [ "$has_custom_index" = "false" ]; then
-            display_dir="${rel_dir#.}"
+            display_dir="${_bdi_rel_dir#.}"
             [ -z "$display_dir" ] && display_dir="/"
             echo "# Index of $display_dir" > "$temp_index"
             echo "" >> "$temp_index"
         fi
 
-
         sort_args=""
-        # If this is the posts dir reverse
-        if is_posts_directory_rel "$rel_dir"; then
+        if is_posts_directory_rel "$_bdi_rel_dir"; then
             sort_args="-r"
         fi
 
         temp_entries="$KEWT_TMPDIR/entries_$$.txt"
         : > "$temp_entries"
 
-        find "$dir" ! -name "$(basename "$dir")" -prune ! -name ".*" -print | while read -r entry; do
-            name="${entry##*/}"
-            case "$name" in
-                template.html|site.conf|style.css|styles.root.css|index.md) continue ;;
-            esac
-            if [ -d "$entry" ]; then
-                entry_rel_dir="${entry#"$src"/}"
-                manifest_dir_hidden_by_draft_index "$entry_rel_dir" && continue
-                dir_url="$(encode_url_path "$name")/index.html"
-                echo "${name}|- [${name}/](${dir_url})" >> "$temp_entries"
-            elif [ "${entry%.md}" != "$entry" ]; then
-                entry_rel_path="${entry#"$src"/}"
-                load_manifest_entry "$entry_rel_path" || continue
-                label="${name%.md}"
-                [ "$manifest_draft" = "true" ] && continue
-
-                post_h="$manifest_title"
-
-                is_post_entry="false"
-                if is_posts_directory_rel "$rel_dir"; then
-                    is_post_entry="true"
-                fi
-
-                if [ -n "$post_h" ]; then
-                    if [ "$is_post_entry" = "true" ]; then
-                        if [ -n "$manifest_post_time" ]; then
-                            label="$post_h - $manifest_post_date $manifest_post_time"
-                        else
-                            label="$post_h - $manifest_post_date"
-                        fi
-                    else
-                        label="$post_h"
-                    fi
-                elif [ "$is_post_entry" = "true" ]; then
-                    if [ -n "$manifest_post_time" ]; then
-                        label="$manifest_post_date $manifest_post_time"
-                    else
-                        label="$manifest_post_date"
-                    fi
-                fi
-                if [ "$is_post_entry" = "true" ]; then
-                    sort_key="${manifest_post_date} ${manifest_post_time}"
-                else
-                    sort_key="$name"
-                fi
-                entry_url=$(encode_url_path "${name%.md}.html")
-                echo "${sort_key}|- [$label](${entry_url})|$name|${entry_url}" >> "$temp_entries"
-            else
-                asset_url=$(encode_url_path "$name")
-                echo "${name}|- [$name]($asset_url)|$name|$asset_url" >> "$temp_entries"
-            fi
-        done
+        build_dir_entries_list "$_bdi_dir" "$_bdi_rel_dir" "$temp_entries"
 
         if [ "$is_posts_dir" = "true" ]; then
             LC_ALL=C sort $sort_args "$temp_entries" > "$KEWT_TMPDIR/sorted_entries_$$.txt"
@@ -197,207 +184,242 @@ eval "find \"$src\" \( $IGNORE_ARGS \) -prune -o -type d -print" | sort | while
         fi
         rm -f "$temp_entries"
 
-        is_home="false"; [ "$dir" = "$src" ] && is_home="true"
-        target_url=$(directory_index_url "$rel_dir")
+        is_home="false"; [ "$_bdi_dir" = "$src" ] && is_home="true"
+        target_url=$(directory_index_url "$_bdi_rel_dir")
 
-        num_items=$(wc -l < "$temp_list")
-        if [ "$is_posts_dir" = "true" ] && [ -n "$posts_per_page" ] && [ "$posts_per_page" -gt 0 ] && [ "$num_items" -gt "$posts_per_page" ]; then
-            num_pages=$(( (num_items + posts_per_page - 1) / posts_per_page ))
-            p=1
-            while [ "$p" -le "$num_pages" ]; do
-                chunk_list="$KEWT_TMPDIR/chunk.md"
-                start_line=$(( (p - 1) * posts_per_page + 1 ))
-                tail -n +$start_line "$temp_list" | head -n "$posts_per_page" > "$chunk_list"
+        render_paginated_index "$_bdi_dir" "$_bdi_rel_dir" "$_bdi_out_dir" "$temp_index" "$temp_list" "$target_url" "$is_home" "$has_custom_index" "$is_posts_dir"
+        rm -f "$temp_index" "$temp_list"
+    fi
+}
 
-                base_url_dir="$(dirname "$target_url")"
-                [ "$base_url_dir" = "/" ] && base_url_dir=""
+render_paginated_index() {
+    _rpi_dir="$1"
+    _rpi_rel_dir="$2"
+    _rpi_out_dir="$3"
+    _rpi_temp_index="$4"
+    _rpi_temp_list="$5"
+    _rpi_target_url="$6"
+    _rpi_is_home="$7"
+    _rpi_has_custom_index="$8"
+    _rpi_is_posts_dir="$9"
 
-                nav_html="<div class=\"pagination\">"
-                if [ "$p" -gt 1 ]; then
-                    if [ "$p" -eq 2 ]; then
-                        nav_html="$nav_html <a href=\"$base_url_dir/index.html\" class=\"prev-page\">&laquo; Prev</a> "
-                    else
-                        nav_html="$nav_html <a href=\"$base_url_dir/page/$((p-1))/index.html\" class=\"prev-page\">&laquo; Prev</a> "
-                    fi
-                fi
-                nav_html="$nav_html <span class=\"page-number\">Page $p of $num_pages</span> "
-                if [ "$p" -lt "$num_pages" ]; then
-                    nav_html="$nav_html <a href=\"$base_url_dir/page/$((p+1))/index.html\" class=\"next-page\">Next &raquo;</a> "
-                fi
-                nav_html="$nav_html</div>"
+    num_items=$(wc -l < "$_rpi_temp_list")
+    if [ "$_rpi_is_posts_dir" = "true" ] && [ -n "$posts_per_page" ] && [ "$posts_per_page" -gt 0 ] && [ "$num_items" -gt "$posts_per_page" ]; then
+        num_pages=$(( (num_items + posts_per_page - 1) / posts_per_page ))
+        p=1
+        while [ "$p" -le "$num_pages" ]; do
+            chunk_list="$KEWT_TMPDIR/chunk.md"
+            start_line=$(( (p - 1) * posts_per_page + 1 ))
+            tail -n +$start_line "$_rpi_temp_list" | head -n "$posts_per_page" > "$chunk_list"
 
-                echo "" >> "$chunk_list"
-                echo "$nav_html" >> "$chunk_list"
+            base_url_dir="$(dirname "$_rpi_target_url")"
+            [ "$base_url_dir" = "/" ] && base_url_dir=""
 
-                temp_index_p="$KEWT_TMPDIR/index_p$p.md"
-                if [ "$has_custom_index" = "false" ]; then
-                    display_dir="${rel_dir#.}"
-                    [ -z "$display_dir" ] && display_dir="/"
-                    echo "# Index of $display_dir" > "$temp_index_p"
-                    echo "" >> "$temp_index_p"
+            nav_html="<div class=\"pagination\">"
+            if [ "$p" -gt 1 ]; then
+                if [ "$p" -eq 2 ]; then
+                    nav_html="$nav_html <a href=\"$base_url_dir/index.html\" class=\"prev-page\">&laquo; Prev</a> "
                 else
-                    : > "$temp_index_p"
+                    nav_html="$nav_html <a href=\"$base_url_dir/page/$((p-1))/index.html\" class=\"prev-page\">&laquo; Prev</a> "
                 fi
+            fi
+            nav_html="$nav_html <span class=\"page-number\">Page $p of $num_pages</span> "
+            if [ "$p" -lt "$num_pages" ]; then
+                nav_html="$nav_html <a href=\"$base_url_dir/page/$((p+1))/index.html\" class=\"next-page\">Next &raquo;</a> "
+            fi
+            nav_html="$nav_html</div>"
 
-                if [ "$has_custom_index" = "true" ]; then
-                    awk '
-                        /^[[:space:]]*\{\{LIST\}\}[[:space:]]*$/ {
-                            while((getline line < "'"$chunk_list"'") > 0) print line
-                            close("'"$chunk_list"'")
-                            next
-                        }
-                        { print }
-                    ' "$dir/index.md" >> "$temp_index_p"
-                else
-                    cat "$chunk_list" >> "$temp_index_p"
-                fi
+            echo "" >> "$chunk_list"
+            echo "$nav_html" >> "$chunk_list"
 
-                if [ "$p" -eq 1 ]; then
-                    out_file="$out_dir/index.html"
-                    target_url_p="$target_url"
-                else
-                    out_file="$out_dir/page/$p/index.html"
-                    target_url_p="$base_url_dir/page/$p/index.html"
-                    mkdir -p "$(dirname "$out_file")"
-                fi
+            temp_index_p="$KEWT_TMPDIR/index_p$p.md"
+            if [ "$_rpi_has_custom_index" = "false" ]; then
+                display_dir="${_rpi_rel_dir#.}"
+                [ -z "$display_dir" ] && display_dir="/"
+                echo "# Index of $display_dir" > "$temp_index_p"
+                echo "" >> "$temp_index_p"
+            else
+                : > "$temp_index_p"
+            fi
 
-                render_markdown "$temp_index_p" "$is_home" "$target_url_p" > "$out_file"
-                rm -f "$temp_index_p" "$chunk_list"
-                p=$((p + 1))
-            done
-        else
-            if [ "$has_custom_index" = "true" ]; then
+            if [ "$_rpi_has_custom_index" = "true" ]; then
                 awk '
                     /^[[:space:]]*\{\{LIST\}\}[[:space:]]*$/ {
-                        while((getline line < "'"$temp_list"'") > 0) print line
-                        close("'"$temp_list"'")
+                        while((getline line < "'"$chunk_list"'") > 0) print line
+                        close("'"$chunk_list"'")
                         next
                     }
                     { print }
-                ' "$dir/index.md" > "$temp_index"
+                ' "$_rpi_dir/index.md" >> "$temp_index_p"
             else
-                cat "$temp_list" >> "$temp_index"
+                cat "$chunk_list" >> "$temp_index_p"
             fi
 
-            do_rebuild="false"
-            needs_rebuild "$dir" "$out_dir/index.html" && do_rebuild="true"
-            [ "$has_custom_index" = "true" ] && needs_rebuild "$dir/index.md" "$out_dir/index.html" && do_rebuild="true"
-
-            if [ "$do_rebuild" = "false" ] && [ -f "$out_dir/index.html" ]; then
-                for _child in "$dir"/*; do
-                    [ -e "$_child" ] || continue
-                    if [ "$_child" -nt "$out_dir/index.html" ]; then
-                        do_rebuild="true"
-                        break
-                    fi
-                done
-            fi
-
-            if [ "$do_rebuild" = "true" ]; then
-                if [ "$has_custom_index" = "true" ]; then
-                    parse_frontmatter "$dir/index.md"
-                else
-                    fm_content_warning=""
-                fi
-
-                if [ -n "$fm_content_warning" ]; then
-                    content_out_file="$out_dir/content.html"
-                    if [ "$rel_dir" = "." ]; then
-                        content_rel_url="/content.html"
-                    else
-                        content_rel_url="/$(encode_url_path "$rel_dir")/content.html"
-                    fi
-                    write_content_warning_outputs "$temp_index" "$content_out_file" "$content_rel_url" "$target_url" "$out_dir/index.html" "$is_home"
-                else
-                    render_markdown "$temp_index" "$is_home" "$target_url" > "$out_dir/index.html"
-                fi
-            fi
-        fi
-        rm -f "$temp_index" "$temp_list"
-    fi
-done
-
-if [ ! -f "$src/styles.css" ] && [ ! -f "$src/style.css" ]; then
-    if [ -f "$src/styles.root.css" ]; then
-        _base_css="$script_dir/styles/$style.css"
-        [ ! -f "$_base_css" ] && _base_css="$script_dir/styles/kewt.css"
-        if [ ! -f "$out/styles.css" ] || [ "$src/styles.root.css" -nt "$out/styles.css" ] || [ "$_base_css" -nt "$out/styles.css" ]; then
-            merge_root_style "$src/styles.root.css" "$_base_css" "$out/styles.css"
-        fi
-    elif [ -f "$script_dir/styles/$style.css" ]; then
-        if needs_rebuild "$script_dir/styles/$style.css" "$out/styles.css"; then
-            copy_style_with_resolved_vars "$script_dir/styles/$style.css" "$out/styles.css"
-        fi
-    elif [ -f "$script_dir/styles/$style.root.css" ]; then
-        _base_css="$script_dir/styles/kewt.css"
-        if [ ! -f "$out/styles.css" ] || [ "$script_dir/styles/$style.root.css" -nt "$out/styles.css" ] || [ "$_base_css" -nt "$out/styles.css" ]; then
-            merge_root_style "$script_dir/styles/$style.root.css" "$_base_css" "$out/styles.css"
-        fi
-    fi
-fi
-
-eval "find \"$src\" \( $IGNORE_ARGS \) -prune -o -type f -print" | sort | while IFS= read -r file; do
-    rel_path="${file#"$src"}"
-    rel_path="${rel_path#/}"
-    dir_rel=$(dirname "$rel_path")
-    out_dir="$out/$dir_rel"
-
-    case "${file##*/}" in
-        template.html|site.conf|style.css|styles.css|styles.root.css) continue ;;
-    esac
-
-    if [ "${file##*/}" = "index.md" ] && grep -q '^[[:space:]]*{{LIST}}[[:space:]]*$' "$file" 2>/dev/null; then
-        continue
-    fi
-
-    is_preserved=0
-    if [ -n "$(eval "find \"$file\" \( $PRESERVE_ARGS \) -print")" ]; then
-        is_preserved=1
-    fi
-
-    is_posts_dir_2="false"
-    if is_posts_directory_rel "$dir_rel"; then
-        is_posts_dir_2="true"
-    fi
-
-    if [ "$single_file_index" = "true" ] && [ "${file%.md}" != "$file" ] && [ "$is_preserved" -eq 0 ] && [ ! -f "$(dirname "$file")/index.md" ] && [ "$is_posts_dir_2" = "false" ]; then
-        load_manifest_dir_entry "$dir_rel" && [ "$dir_md_count" -eq 1 ] && continue
-    fi
-
-    if [ "${file%.md}" != "$file" ] && [ "$is_preserved" -eq 0 ]; then
-        load_manifest_entry "$rel_path" || continue
-        [ "$manifest_draft" = "true" ] && continue
-        is_home="false"; [ "$file" = "$src/index.md" ] && is_home="true"
-        out_file="$out/${rel_path%.md}.html"
-        if needs_rebuild "$file" "$out_file"; then
-            fm_title="$manifest_title"
-            fm_content_warning="$manifest_content_warning"
-            if [ -n "$manifest_content_warning" ]; then
-                content_out_file="$out/${rel_path%.md}-content.html"
-                content_rel_url="/$(encode_url_path "${rel_path%.md}")-content.html"
-                orig_rel_url="$manifest_url"
-                write_content_warning_outputs "$file" "$content_out_file" "$content_rel_url" "$orig_rel_url" "$out_file" "$is_home"
+            if [ "$p" -eq 1 ]; then
+                out_file="$_rpi_out_dir/index.html"
+                target_url_p="$_rpi_target_url"
             else
-                render_markdown "$file" "$is_home" > "$out_file"
+                out_file="$_rpi_out_dir/page/$p/index.html"
+                target_url_p="$base_url_dir/page/$p/index.html"
+                mkdir -p "$(dirname "$out_file")"
             fi
-        fi
+
+            render_markdown "$temp_index_p" "$_rpi_is_home" "$target_url_p" > "$out_file"
+            rm -f "$temp_index_p" "$chunk_list"
+            p=$((p + 1))
+        done
     else
-        if needs_rebuild "$file" "$out/$rel_path"; then
-            cp "$file" "$out/$rel_path"
+        if [ "$_rpi_has_custom_index" = "true" ]; then
+            awk '
+                /^[[:space:]]*\{\{LIST\}\}[[:space:]]*$/ {
+                    while((getline line < "'"$_rpi_temp_list"'") > 0) print line
+                    close("'"$_rpi_temp_list"'")
+                    next
+                }
+                { print }
+            ' "$_rpi_dir/index.md" > "$_rpi_temp_index"
+        else
+            cat "$_rpi_temp_list" >> "$_rpi_temp_index"
+        fi
+
+        do_rebuild="false"
+        needs_rebuild "$_rpi_dir" "$_rpi_out_dir/index.html" && do_rebuild="true"
+        [ "$_rpi_has_custom_index" = "true" ] && needs_rebuild "$_rpi_dir/index.md" "$_rpi_out_dir/index.html" && do_rebuild="true"
+
+        if [ "$do_rebuild" = "false" ] && [ -f "$_rpi_out_dir/index.html" ]; then
+            for _child in "$_rpi_dir"/*; do
+                [ -e "$_child" ] || continue
+                if [ "$_child" -nt "$_rpi_out_dir/index.html" ]; then
+                    do_rebuild="true"
+                    break
+                fi
+            done
+        fi
+
+        if [ "$do_rebuild" = "true" ]; then
+            if [ "$_rpi_has_custom_index" = "true" ]; then
+                parse_frontmatter "$_rpi_dir/index.md"
+            else
+                fm_content_warning=""
+            fi
+
+            if [ -n "$fm_content_warning" ]; then
+                content_out_file="$_rpi_out_dir/content.html"
+                if [ "$_rpi_rel_dir" = "." ]; then
+                    content_rel_url="/content.html"
+                else
+                    content_rel_url="/$(encode_url_path "$_rpi_rel_dir")/content.html"
+                fi
+                write_content_warning_outputs "$_rpi_temp_index" "$content_out_file" "$content_rel_url" "$_rpi_target_url" "$_rpi_out_dir/index.html" "$_rpi_is_home"
+            else
+                render_markdown "$_rpi_temp_index" "$_rpi_is_home" "$_rpi_target_url" > "$_rpi_out_dir/index.html"
+            fi
         fi
     fi
-done
+}
 
-if [ -n "$error_page" ] && [ ! -f "$out/$error_page" ]; then
-    temp_404="$KEWT_TMPDIR/404_gen.md"
-    echo "# 404 - Not Found" > "$temp_404"
-    echo "" >> "$temp_404"
-    echo "The requested page could not be found." >> "$temp_404"
-    render_markdown "$temp_404" "false" "/$error_page" > "$out/$error_page"
-    rm -f "$temp_404"
-fi
+build_directories() {
+    eval "find \"$src\" \( $IGNORE_ARGS \) -prune -o -type d -print" | sort | while read -r dir; do
+        rel_dir="${dir#"$src"}"
+        rel_dir="${rel_dir#/}"
+        [ -z "$rel_dir" ] && rel_dir="."
+        out_dir="$out/$rel_dir"
+        mkdir -p "$out_dir"
+
+        if [ -f "$dir/styles.css" ]; then
+            if needs_rebuild "$dir/styles.css" "$out_dir/styles.css"; then
+                copy_style_with_resolved_vars "$dir/styles.css" "$out_dir/styles.css"
+            fi
+        elif [ -f "$dir/style.css" ]; then
+            if needs_rebuild "$dir/style.css" "$out_dir/styles.css"; then
+                copy_style_with_resolved_vars "$dir/style.css" "$out_dir/styles.css"
+            fi
+        fi
+
+        [ "$dir_indexes" != "true" ] && continue
+
+        build_dir_index "$dir" "$rel_dir" "$out_dir"
+    done
+}
+
+build_files() {
+    eval "find \"$src\" \( $IGNORE_ARGS \) -prune -o -type f -print" | sort | while IFS= read -r file; do
+        rel_path="${file#"$src"}"
+        rel_path="${rel_path#/}"
+        dir_rel=$(dirname "$rel_path")
+        out_dir="$out/$dir_rel"
+
+        case "${file##*/}" in
+            template.html|site.conf|style.css|styles.css|styles.root.css) continue ;;
+        esac
+
+        if [ "${file##*/}" = "index.md" ] && grep -q '^[[:space:]]*{{LIST}}[[:space:]]*$' "$file" 2>/dev/null; then
+            continue
+        fi
+
+        is_preserved=0
+        if [ -n "$(eval "find \"$file\" \( $PRESERVE_ARGS \) -print")" ]; then
+            is_preserved=1
+        fi
+
+        is_posts_dir_2="false"
+        if is_posts_directory_rel "$dir_rel"; then
+            is_posts_dir_2="true"
+        fi
+
+        if [ "$single_file_index" = "true" ] && [ "${file%.md}" != "$file" ] && [ "$is_preserved" -eq 0 ] && [ ! -f "$(dirname "$file")/index.md" ] && [ "$is_posts_dir_2" = "false" ]; then
+            load_manifest_dir_entry "$dir_rel" && [ "$dir_md_count" -eq 1 ] && continue
+        fi
+
+        if [ "${file%.md}" != "$file" ] && [ "$is_preserved" -eq 0 ]; then
+            load_manifest_entry "$rel_path" || continue
+            [ "$manifest_draft" = "true" ] && continue
+            is_home="false"; [ "$file" = "$src/index.md" ] && is_home="true"
+            out_file="$out/${rel_path%.md}.html"
+            if needs_rebuild "$file" "$out_file"; then
+                fm_title="$manifest_title"
+                fm_content_warning="$manifest_content_warning"
+                if [ -n "$manifest_content_warning" ]; then
+                    content_out_file="$out/${rel_path%.md}-content.html"
+                    content_rel_url="/$(encode_url_path "${rel_path%.md}")-content.html"
+                    orig_rel_url="$manifest_url"
+                    write_content_warning_outputs "$file" "$content_out_file" "$content_rel_url" "$orig_rel_url" "$out_file" "$is_home"
+                else
+                    render_markdown "$file" "$is_home" > "$out_file"
+                fi
+            fi
+        else
+            if needs_rebuild "$file" "$out/$rel_path"; then
+                cp "$file" "$out/$rel_path"
+            fi
+        fi
+    done
+}
+
+build_root_style() {
+    if [ ! -f "$src/styles.css" ] && [ ! -f "$src/style.css" ]; then
+        if [ -f "$src/styles.root.css" ]; then
+            _base_css="$script_dir/styles/$style.css"
+            [ ! -f "$_base_css" ] && _base_css="$script_dir/styles/kewt.css"
+            if [ ! -f "$out/styles.css" ] || [ "$src/styles.root.css" -nt "$out/styles.css" ] || [ "$_base_css" -nt "$out/styles.css" ]; then
+                merge_root_style "$src/styles.root.css" "$_base_css" "$out/styles.css"
+            fi
+        elif [ -f "$script_dir/styles/$style.css" ]; then
+            if needs_rebuild "$script_dir/styles/$style.css" "$out/styles.css"; then
+                copy_style_with_resolved_vars "$script_dir/styles/$style.css" "$out/styles.css"
+            fi
+        elif [ -f "$script_dir/styles/$style.root.css" ]; then
+            _base_css="$script_dir/styles/kewt.css"
+            if [ ! -f "$out/styles.css" ] || [ "$script_dir/styles/$style.root.css" -nt "$out/styles.css" ] || [ "$_base_css" -nt "$out/styles.css" ]; then
+                merge_root_style "$script_dir/styles/$style.root.css" "$_base_css" "$out/styles.css"
+            fi
+        fi
+    fi
+}
+
+build_sitemap() {
+    [ -n "$base_url" ] || return
 
-if [ -n "$base_url" ]; then
     sitemap_file="$out/sitemap.xml"
     base_url="${base_url%/}"
     today=$(date +%Y-%m-%d)
@@ -407,35 +429,24 @@ if [ -n "$base_url" ]; then
 
     find "$out" -type f -name "*.html" -print | sort | while IFS= read -r html_file; do
         rel_url="${html_file#"$out"}"
-
-        # Don't include 404 in the sitemap (duh)
         [ "${rel_url#/}" = "$error_page" ] && continue
 
-        {
-            printf '  <url>\n'
-            printf '    <loc>%s%s</loc>\n' "$base_url" "$rel_url"
-            printf '    <lastmod>%s</lastmod>\n' "$today"
-            printf '  </url>\n'
-        } >> "$sitemap_file"
+        printf '  <url>\n    <loc>%s%s</loc>\n    <lastmod>%s</lastmod>\n  </url>\n' "$base_url" "$rel_url" "$today" >> "$sitemap_file"
     done
 
     printf '</urlset>\n' >> "$sitemap_file"
-fi
+}
+
+build_feed() {
+    [ "$generate_feed" = "true" ] && [ -n "$base_url" ] || return
 
-if [ "$generate_feed" = "true" ] && [ -n "$base_url" ]; then
     feed_path="$out/$feed_file"
     base_url_feed="${base_url%/}"
     build_date=$(date -u '+%a, %d %b %Y %H:%M:%S +0000')
 
     printf '<?xml version="1.0" encoding="UTF-8"?>\n' > "$feed_path"
-    {
-        printf '<rss version="2.0">\n'
-        printf '  <channel>\n'
-        printf '    <title>%s</title>\n' "$title"
-        printf '    <link>%s</link>\n' "$base_url_feed"
-        printf '    <description>%s</description>\n' "$title"
-        printf '    <lastBuildDate>%s</lastBuildDate>\n' "$build_date"
-    } >> "$feed_path"
+    printf '<rss version="2.0">\n  <channel>\n    <title>%s</title>\n    <link>%s</link>\n    <description>%s</description>\n    <lastBuildDate>%s</lastBuildDate>\n' \
+        "$title" "$base_url_feed" "$title" "$build_date" >> "$feed_path"
 
     temp_feed_files="$KEWT_TMPDIR/feed_files_$$.txt"
     : > "$temp_feed_files"
@@ -462,32 +473,19 @@ if [ "$generate_feed" = "true" ] && [ -n "$base_url" ]; then
             post_heading=$(echo "$post_slug" | sed 's/-/ /g' | awk '{for(i=1;i<=NF;i++) $i=toupper(substr($i,1,1)) substr($i,2)}1')
         fi
         feed_post_title="$post_heading - $post_date $post_time"
-
         post_url="$base_url_feed$manifest_url"
-
         pub_date=$(format_rfc2822_utc "$post_date" "$post_time")
 
-        {
-            printf '    <item>\n'
-            printf '      <title>%s</title>\n' "$feed_post_title"
-            printf '      <link>%s</link>\n' "$post_url"
-            printf '      <guid>%s</guid>\n' "$post_url"
-            printf '      <pubDate>%s</pubDate>\n' "$pub_date"
-            printf '    </item>\n'
-        } >> "$feed_path"
+        printf '    <item>\n      <title>%s</title>\n      <link>%s</link>\n      <guid>%s</guid>\n      <pubDate>%s</pubDate>\n    </item>\n' \
+            "$feed_post_title" "$post_url" "$post_url" "$pub_date" >> "$feed_path"
     done
 
-    printf '  </channel>\n' >> "$feed_path"
-    printf '</rss>\n' >> "$feed_path"
-fi
+    printf '  </channel>\n</rss>\n' >> "$feed_path"
+}
 
-if [ "$generate_search" = "true" ] || [ "$generate_tags" = "true" ]; then
-    if [ "$generate_search" = "true" ]; then
-        printf '[\n' > "$out/search.json"
-    fi
+build_search_index() {
+    printf '[\n' > "$out/search.json"
     first_search_item="true"
-    temp_tags="$KEWT_TMPDIR/tags_$$.txt"
-    : > "$temp_tags"
 
     while IFS= read -r rel_path; do
         load_manifest_entry "$rel_path" || continue
@@ -529,80 +527,113 @@ if [ "$generate_search" = "true" ] || [ "$generate_tags" = "true" ]; then
         [ "$manifest_draft" = "true" ] && continue
         md_heading="$manifest_title"
 
-        if [ "$generate_search" = "true" ]; then
-            if [ -z "$manifest_content_warning" ] || [ "$include_cw_pages_in_search" = "true" ]; then
-                md_content="$manifest_search_content"
+        if [ -z "$manifest_content_warning" ] || [ "$include_cw_pages_in_search" = "true" ]; then
+            md_content="$manifest_search_content"
             if [ "$first_search_item" = "false" ]; then
                 printf ',\n' >> "$out/search.json"
             fi
             printf '  {"url": "%s", "title": "%s", "content": "%s"}' "$md_url" "$md_heading" "$md_content" >> "$out/search.json"
             first_search_item="false"
-            fi
         fi
+    done < "$manifest_visible_list"
 
-        if [ "$generate_tags" = "true" ] && [ -n "$manifest_tags" ]; then
+    printf '\n]\n' >> "$out/search.json"
+    cp "$script_dir/lib/search.js" "$out/search.js"
+
+    search_md="$KEWT_TMPDIR/search_$$.md"
+    printf '%s\n' '# Search' '' \
+        '<form class="kewt-search-page" action="/search.html" method="get">' \
+        '  <input type="text" id="search-box" name="q" placeholder="Search..." required>' \
+        '  <button type="submit">Search</button>' \
+        '</form>' '' \
+        '<div id="search-results-list">' \
+        '  <p>Loading...</p>' \
+        '</div>' '' \
+        '<script src="/search.js"></script>' > "$search_md"
+    render_markdown "$search_md" "false" "/search.html" > "$out/search.html"
+    rm -f "$search_md"
+}
+
+build_tags() {
+    temp_tags="$KEWT_TMPDIR/tags_$$.txt"
+    : > "$temp_tags"
+
+    while IFS= read -r rel_path; do
+        load_manifest_entry "$rel_path" || continue
+        [ "$manifest_draft" = "true" ] && continue
+        md_heading="$manifest_title"
+
+        if [ -n "$manifest_tags" ]; then
             old_ifs=$IFS
             IFS=','
             for tag in $manifest_tags; do
                 tag=$(echo "$tag" | sed 's/^[ \t]*//;s/[ \t]*$//')
                 [ -z "$tag" ] && continue
-                printf '%s|%s|%s\n' "$tag" "$md_url" "$md_heading" >> "$temp_tags"
+                printf '%s|%s|%s\n' "$tag" "$manifest_url" "$md_heading" >> "$temp_tags"
             done
             IFS=$old_ifs
         fi
     done < "$manifest_visible_list"
 
+    tags_out_dir="$out/$tags_dir"
+    mkdir -p "$tags_out_dir"
+
+    tags_index_md="$KEWT_TMPDIR/tags_index_$$.md"
+    echo "# Tags" > "$tags_index_md"
+    echo "" >> "$tags_index_md"
+
+    cut -d'|' -f1 "$temp_tags" | sort -u | while IFS= read -r tag; do
+        tag_slug=$(echo "$tag" | tr '[:upper:]' '[:lower:]' | sed 's/[^a-z0-9]/-/g')
+
+        echo "- [$tag](/$(echo "$tags_dir" | sed 's|^\/||; s|\/$||')/$tag_slug.html)" >> "$tags_index_md"
+
+        tag_page_md="$KEWT_TMPDIR/tag_page_$$.md"
+        echo "# Tag: $tag" > "$tag_page_md"
+        echo "" >> "$tag_page_md"
+        echo "Posts tagged with **$tag**:" >> "$tag_page_md"
+        echo "" >> "$tag_page_md"
+
+        grep "^${tag}|" "$temp_tags" | while IFS='|' read -r _t t_url t_title; do
+            echo "- [$t_title]($t_url)" >> "$tag_page_md"
+        done
+
+        render_markdown "$tag_page_md" "false" "/$tags_dir/$tag_slug.html" > "$tags_out_dir/$tag_slug.html"
+        rm -f "$tag_page_md"
+    done
+
+    render_markdown "$tags_index_md" "false" "/$tags_dir/index.html" > "$tags_out_dir/index.html"
+    rm -f "$tags_index_md" "$temp_tags"
+}
+
+build_error_page() {
+    [ -n "$error_page" ] && [ ! -f "$out/$error_page" ] || return
+
+    temp_404="$KEWT_TMPDIR/404_gen.md"
+    printf '# 404 - Not Found\n\nThe requested page could not be found.\n' > "$temp_404"
+    render_markdown "$temp_404" "false" "/$error_page" > "$out/$error_page"
+    rm -f "$temp_404"
+}
+
+build_site() {
+    echo "Building site from '$src' to '$out'..."
+
+    build_markdown_manifest
+    build_full_nav
+
+    build_directories
+    build_root_style
+    build_files
+    build_error_page
+    build_sitemap
+    build_feed
+
     if [ "$generate_search" = "true" ]; then
-        printf '\n]\n' >> "$out/search.json"
-
-        cp "$script_dir/lib/search.js" "$out/search.js"
-
-        search_md="$KEWT_TMPDIR/search_$$.md"
-        printf '%s\n' '# Search' '' \
-            '<form class="kewt-search-page" action="/search.html" method="get">' \
-            '  <input type="text" id="search-box" name="q" placeholder="Search..." required>' \
-            '  <button type="submit">Search</button>' \
-            '</form>' '' \
-            '<div id="search-results-list">' \
-            '  <p>Loading...</p>' \
-            '</div>' '' \
-            '<script src="/search.js"></script>' > "$search_md"
-        render_markdown "$search_md" "false" "/search.html" > "$out/search.html"
-        rm -f "$search_md"
+        build_search_index
     fi
 
     if [ "$generate_tags" = "true" ]; then
-        tags_out_dir="$out/$tags_dir"
-        mkdir -p "$tags_out_dir"
-
-        tags_index_md="$KEWT_TMPDIR/tags_index_$$.md"
-        echo "# Tags" > "$tags_index_md"
-        echo "" >> "$tags_index_md"
-
-        cut -d'|' -f1 "$temp_tags" | sort -u | while IFS= read -r tag; do
-            tag_slug=$(echo "$tag" | tr '[:upper:]' '[:lower:]' | sed 's/[^a-z0-9]/-/g')
-
-            echo "- [$tag](/$(echo "$tags_dir" | sed 's|^\/||; s|\/$||')/$tag_slug.html)" >> "$tags_index_md"
-
-            tag_page_md="$KEWT_TMPDIR/tag_page_$$.md"
-            echo "# Tag: $tag" > "$tag_page_md"
-            echo "" >> "$tag_page_md"
-            echo "Posts tagged with **$tag**:" >> "$tag_page_md"
-            echo "" >> "$tag_page_md"
-
-            grep "^${tag}|" "$temp_tags" | while IFS='|' read -r _t t_url t_title; do
-                echo "- [$t_title]($t_url)" >> "$tag_page_md"
-            done
-
-            render_markdown "$tag_page_md" "false" "/$tags_dir/$tag_slug.html" > "$tags_out_dir/$tag_slug.html"
-            rm -f "$tag_page_md"
-        done
-
-        render_markdown "$tags_index_md" "false" "/$tags_dir/index.html" > "$tags_out_dir/index.html"
-        rm -f "$tags_index_md"
+        build_tags
     fi
-    rm -f "$temp_tags"
-fi
 
-echo "Build complete."
+    echo "Build complete."
 }
diff --git a/lib/commands.sh b/lib/commands.sh
index 4f5948b..5e2fde1 100644
--- a/lib/commands.sh
+++ b/lib/commands.sh
@@ -1,4 +1,5 @@
 #!/bin/sh
+# shellcheck disable=SC2153
 
 usage() {
     invoked_as=$(basename "${KEWT_INVOKED_AS:-$0}")
@@ -97,11 +98,9 @@ update_site() {
     target_conf="$update_dir/site.conf"
     target_tmpl="$update_dir/template.html"
 
-    # Generate default site.conf
     default_conf="$KEWT_TMPDIR/default_site.conf"
     printf '%s\n' "$DEFAULT_CONF" > "$default_conf"
 
-    # Update site.conf
     if [ ! -f "$target_conf" ]; then
         echo "No site.conf found in '$update_dir'; nothing to update."
     else
@@ -126,7 +125,6 @@ update_site() {
         fi
     fi
 
-    # Update template.html
     if [ -f "$target_tmpl" ]; then
         default_tmpl="$KEWT_TMPDIR/default_template.html"
         printf '%s\n' "$DEFAULT_TMPL" > "$default_tmpl"
diff --git a/lib/config.sh b/lib/config.sh
index 7e4cdb3..ca386e7 100644
--- a/lib/config.sh
+++ b/lib/config.sh
@@ -62,106 +62,88 @@ DEFAULT_TMPL='<!doctype html>
     </body>
 </html>'
 
+_parse_conf_val() {
+    _pv_val="$1"
+    case "$_pv_val" in
+        \"*\")
+            _pv_val=${_pv_val#\"}
+            _pv_val=${_pv_val%\"}
+            printf '%s' "$_pv_val" | sed 's/\\"/\"/g; s/\\\\/\\/g'
+            ;;
+        \'*\')
+            _pv_val=${_pv_val#\'}
+            _pv_val=${_pv_val%\'}
+            printf '%s' "$_pv_val" | sed "s/\\\\'/'/g; s/\\\\/\\/g"
+            ;;
+        *)
+            printf '%s' "$_pv_val"
+            ;;
+    esac
+}
+
+_load_conf_line() {
+    case "$1" in
+        ''|'#'*) return ;;
+        *=*) ;;
+        *) return ;;
+    esac
+
+    _lc_key=${1%%=*}
+    _lc_val=${1#*=}
+    _lc_key=$(printf '%s' "$_lc_key" | sed 's/^[[:space:]]*//; s/[[:space:]]*$//')
+    _lc_val=$(_parse_conf_val "$(printf '%s' "$_lc_val" | sed 's/^[[:space:]]*//; s/[[:space:]]*$//')")
+
+    case "$_lc_key" in
+        title) title="$_lc_val" ;;
+        style) style="${_lc_val#/}" ;;
+        dir_indexes) dir_indexes="$_lc_val" ;;
+        single_file_index) single_file_index="$_lc_val" ;;
+        flatten) flatten="$_lc_val" ;;
+        order) order="$_lc_val" ;;
+        home_name) home_name="$_lc_val" ;;
+        show_home_in_nav) show_home_in_nav="$_lc_val" ;;
+        nav_links) nav_links="$_lc_val" ;;
+        nav_extra) nav_extra="$_lc_val" ;;
+        footer) footer="$_lc_val" ;;
+        logo) logo="${_lc_val#/}" ;;
+        display_logo) display_logo="$_lc_val" ;;
+        display_title) display_title="$_lc_val" ;;
+        logo_as_favicon) logo_as_favicon="$_lc_val" ;;
+        favicon) favicon="${_lc_val#/}" ;;
+        generate_page_title) generate_page_title="$_lc_val" ;;
+        error_page) error_page="${_lc_val#/}" ;;
+        versioning) versioning="$_lc_val" ;;
+        enable_header_links) enable_header_links="$_lc_val" ;;
+        base_url) base_url="$_lc_val" ;;
+        generate_feed) generate_feed="$_lc_val" ;;
+        feed_file) feed_file="${_lc_val#/}" ;;
+        posts_dir) posts_dir="${_lc_val#/}" ;;
+        posts_per_page) posts_per_page="$_lc_val" ;;
+        custom_admonitions) custom_admonitions="$_lc_val" ;;
+        cw_hide_url) cw_hide_url="$_lc_val" ;;
+        lang) lang="$_lc_val" ;;
+        draft_by_default) draft_by_default="$_lc_val" ;;
+        generate_tags) generate_tags="$_lc_val" ;;
+        tags_dir) tags_dir="${_lc_val#/}" ;;
+        generate_search) generate_search="$_lc_val" ;;
+        search_in_footer) search_in_footer="$_lc_val" ;;
+        search_in_header) search_in_header="$_lc_val" ;;
+        include_cw_pages_in_search) include_cw_pages_in_search="$_lc_val" ;;
+    esac
+}
+
 reset_config() {
-    title="kewt"
-    style="kewt"
-    lang="en"
-    draft_by_default="false"
-    dir_indexes="true"
-    single_file_index="true"
-    flatten="false"
-    order=""
-    home_name="Home"
-    show_home_in_nav="true"
-    nav_links=""
-    nav_extra=""
-    footer="made with <a href=\"https://kewt.krzak.org\">kewt</a>"
-    logo=""
-    display_logo="false"
-    display_title="true"
-    logo_as_favicon="true"
-    favicon=""
-    generate_page_title="true"
-    error_page="not_found.html"
-    versioning="false"
-    enable_header_links="true"
-    base_url=""
-    generate_feed="false"
-    feed_file="rss.xml"
-    posts_dir=""
-    posts_per_page="12"
-    custom_admonitions=""
-    cw_hide_url="true"
-    generate_tags="false"
-    tags_dir="tags"
-    generate_search="false"
-    search_in_footer="false"
-    search_in_header="false"
-    include_cw_pages_in_search="false"
+    while IFS= read -r _rc_line; do
+        _load_conf_line "$_rc_line"
+    done <<EOF
+$DEFAULT_CONF
+EOF
 }
 
 load_config() {
     [ -f "$1" ] || return
-    while IFS= read -r line || [ -n "$line" ]; do
-        case "$line" in
-            ''|'#'*) continue ;;
-            *=*) ;;
-            *) continue ;;
-        esac
-
-        key=${line%%=*}
-        val=${line#*=}
-
-        key=$(printf '%s' "$key" | sed 's/^[[:space:]]*//; s/[[:space:]]*$//')
-        val=$(printf '%s' "$val" | sed 's/^[[:space:]]*//; s/[[:space:]]*$//')
-        case "$val" in
-            \"*\")
-                val=${val#\"}; val=${val%\"}
-                val=$(printf '%s' "$val" | sed 's/\\"/\"/g; s/\\\\/\\/g')
-                ;;
-            \'*\')
-                val=${val#\'}; val=${val%\'}
-                val=$(printf '%s' "$val" | sed "s/\\\\'/'/g; s/\\\\/\\/g")
-                ;;
-        esac
-
-        case "$key" in
-            title) title="$val" ;;
-            style) style="${val#/}" ;;
-            dir_indexes) dir_indexes="$val" ;;
-            single_file_index) single_file_index="$val" ;;
-            flatten) flatten="$val" ;;
-            order) order="$val" ;;
-            home_name) home_name="$val" ;;
-            show_home_in_nav) show_home_in_nav="$val" ;;
-            nav_links) nav_links="$val" ;;
-            nav_extra) nav_extra="$val" ;;
-            footer) footer="$val" ;;
-            logo) logo="${val#/}" ;;
-            display_logo) display_logo="$val" ;;
-            display_title) display_title="$val" ;;
-            logo_as_favicon) logo_as_favicon="$val" ;;
-            favicon) favicon="${val#/}" ;;
-            generate_page_title) generate_page_title="$val" ;;
-            error_page) error_page="${val#/}" ;;
-            versioning) versioning="$val" ;;
-            enable_header_links) enable_header_links="$val" ;;
-            base_url) base_url="$val" ;;
-            generate_feed) generate_feed="$val" ;;
-            feed_file) feed_file="${val#/}" ;;
-            posts_dir) posts_dir="${val#/}" ;;
-            posts_per_page) posts_per_page="$val" ;;
-            custom_admonitions) custom_admonitions="$val" ;;
-            cw_hide_url) cw_hide_url="$val" ;;
-            lang) lang="$val" ;;
-            draft_by_default) draft_by_default="$val" ;;
-            generate_tags) generate_tags="$val" ;;
-            tags_dir) tags_dir="${val#/}" ;;
-            generate_search) generate_search="$val" ;;
-            search_in_footer) search_in_footer="$val" ;;
-            search_in_header) search_in_header="$val" ;;
-            include_cw_pages_in_search) include_cw_pages_in_search="$val" ;;
-        esac
+    while IFS= read -r _lc_line || [ -n "$_lc_line" ]; do
+        _load_conf_line "$_lc_line"
     done < "$1"
 }
 
diff --git a/lib/generator.sh b/lib/generator.sh
index 588563c..9ded43d 100644
--- a/lib/generator.sh
+++ b/lib/generator.sh
@@ -1,4 +1,5 @@
 #!/bin/sh
+# shellcheck disable=SC2086
 
 SEARCH_FORM_FOOTER='<form class="kewt-search-footer" action="/search.html" method="get"><input type="text" name="q" placeholder="Search..." required><button type="submit">Go</button></form>'
 SEARCH_FORM_HEADER='<form class="kewt-search-header" action="/search.html" method="get"><input type="text" name="q" placeholder="Search..." required><button type="submit">Go</button></form>'
@@ -37,12 +38,14 @@ generate_nav() {
 
     sort -u "$nav_input" | AWK_SRC="$1" AWK_SINGLE_FILE_INDEX="$single_file_index" AWK_FLATTEN="$flatten" AWK_ORDER="$order" AWK_HOME_NAME="$home_name" AWK_SHOW_HOME_IN_NAV="$show_home_in_nav" AWK_DINFO="$dinfo" awk -f "$awk_dir/generate_sidebar.awk"
 }
+
 escape_html_text() {
     printf '%s' "$1" | sed \
         -e 's/&/\&amp;/g' \
         -e 's/</\&lt;/g' \
         -e 's/>/\&gt;/g'
 }
+
 escape_html_attr() {
     printf '%s' "$1" | sed \
         -e 's/&/\&amp;/g' \
@@ -50,13 +53,13 @@ escape_html_attr() {
         -e 's/</\&lt;/g' \
         -e 's/>/\&gt;/g'
 }
+
 nav_links_html() {
     [ -n "$nav_links" ] || return
 
     old_ifs=$IFS
     set -f
     IFS=','
-    # shellcheck disable=SC2086
     set -- $nav_links
     IFS=$old_ifs
     set +f
@@ -93,6 +96,7 @@ nav_links_html() {
     done
     printf '</ul>'
 }
+
 find_closest() {
     target="$1"
     start_dir="$2"
@@ -108,11 +112,13 @@ find_closest() {
         echo "$src/$target"
     fi
 }
+
 copy_style_with_resolved_vars() {
     src_style="$1"
     out_style="$2"
     awk -f "$awk_dir/replace_variables.awk" "$src_style" > "$out_style"
 }
+
 merge_root_style() {
     root_file="$1"
     base_css="$2"
@@ -134,51 +140,15 @@ merge_root_style() {
         ' "$base_css"
     } | awk -f "$awk_dir/replace_variables.awk" > "$out_file"
 }
-render_markdown() {
-    file="$1"
-    is_home="$2"
-    url_override="$3"
 
-    if [ -n "$url_override" ]; then
-        current_url="$url_override"
-    else
-        rel_path="${file#"$src"}"
-        rel_path="${rel_path#/}"
-        current_url=$(markdown_file_url "$rel_path")
-    fi
-
-    content_file="$file"
-    if [ -n "$posts_dir" ] && [ "$file" != "$src/$posts_dir/index.md" ]; then
-        rel_dir_of_url=$(dirname "$current_url")
-        rel_dir_of_url="${rel_dir_of_url#/}"
-        if { [ "$rel_dir_of_url" = "$posts_dir" ] || [ "./$rel_dir_of_url" = "$posts_dir" ]; } && [ "$(basename "$current_url")" != "index.html" ]; then
-             temp_post_with_backlink="$KEWT_TMPDIR/post_with_backlink_$$.md"
-             printf "[< Back](index.html)\n\n" > "$temp_post_with_backlink"
-             awk -f "$awk_dir/frontmatter.awk" "$file" >> "$temp_post_with_backlink"
-
-             post_md_name="$(basename "$current_url" .html).md"
-             prevnext_file="$KEWT_TMPDIR/prevnext/$post_md_name"
-             if [ -f "$prevnext_file" ]; then
-                 IFS='|' read -r prev_str next_str < "$prevnext_file"
-
-                 printf "\n\n---\n<div class=\"post-nav\">\n" >> "$temp_post_with_backlink"
-                 if [ -n "$prev_str" ]; then
-                     printf "<span class=\"prev-post\">%s</span>\n" "$prev_str" >> "$temp_post_with_backlink"
-                 fi
-                 if [ -n "$next_str" ]; then
-                     printf "<span class=\"next-post\">%s</span>\n" "$next_str" >> "$temp_post_with_backlink"
-                 fi
-                 printf "</div>\n" >> "$temp_post_with_backlink"
-             fi
-             content_file="$temp_post_with_backlink"
-        fi
-    fi
-
-    local_template=$(find_closest "template.html" "$(dirname "$file")")
+resolve_render_template() {
+    local_template=$(find_closest "template.html" "$(dirname "$1")")
     [ -z "$local_template" ] && local_template="$template"
+}
 
-    closest_style_src=$(find_closest "styles.css" "$(dirname "$file")")
-    [ -z "$closest_style_src" ] && closest_style_src=$(find_closest "style.css" "$(dirname "$file")")
+resolve_render_style_path() {
+    closest_style_src=$(find_closest "styles.css" "$(dirname "$1")")
+    [ -z "$closest_style_src" ] && closest_style_src=$(find_closest "style.css" "$(dirname "$1")")
     if [ -n "$closest_style_src" ]; then
         style_rel_to_src="${closest_style_src#"$src"/}"
         case "$closest_style_src" in
@@ -190,7 +160,9 @@ render_markdown() {
     else
         style_path="/styles.css"
     fi
+}
 
+build_header_brand_html() {
     logo_html=""
     if [ "$display_logo" = "true" ] && [ -n "$logo" ]; then
         logo_html="<img class=\"site-logo\" src=\"$logo\" alt=\"$title\" />"
@@ -210,26 +182,27 @@ render_markdown() {
     else
         header_brand="<a href=\"/index.html\">$title</a>"
     fi
+}
 
+build_favicon_head() {
     favicon_src=""
     if [ "$logo_as_favicon" = "true" ] && [ -n "$logo" ]; then
         favicon_src="$logo"
     elif [ -n "$favicon" ]; then
         favicon_src="$favicon"
     fi
-    head_extra=""
+
     if [ -n "$favicon_src" ]; then
-        if echo "$favicon_src" | grep -q "^http"; then
-            head_extra="<link rel=\"icon\" href=\"$favicon_src\" />"
-        elif echo "$favicon_src" | grep -q "^/"; then
-            head_extra="<link rel=\"icon\" href=\"$favicon_src\" />"
-        else
-            head_extra="<link rel=\"icon\" href=\"/$favicon_src\" />"
-        fi
+        case "$favicon_src" in
+            http*|/*) head_extra="<link rel=\"icon\" href=\"$favicon_src\" />" ;;
+            *) head_extra="<link rel=\"icon\" href=\"/$favicon_src\" />" ;;
+        esac
+    else
+        head_extra=""
     fi
+}
 
-    parse_frontmatter "$file"
-
+build_page_title() {
     page_title="$title"
     if [ -n "$fm_title" ]; then
         page_title="$fm_title - $title"
@@ -250,7 +223,9 @@ render_markdown() {
             fi
         fi
     fi
+}
 
+build_og_tags() {
     head_extra_og="<meta property=\"og:title\" content=\"$(escape_html_attr "$page_title")\" />"
     if [ -n "$fm_description" ]; then
         head_extra_og="$head_extra_og
@@ -266,17 +241,23 @@ render_markdown() {
     else
         head_extra="$head_extra_og"
     fi
+}
 
+build_cw_url_hide() {
     if [ "$is_cw_content_page" = "true" ] && [ "$cw_hide_url" = "true" ]; then
         head_extra="$head_extra
         <script>window.history.replaceState(null, '', '$current_url');</script>"
     fi
+}
 
+build_composed_footer() {
     final_footer="$footer"
     if [ "$search_in_footer" = "true" ]; then
         final_footer="$footer $SEARCH_FORM_FOOTER"
     fi
+}
 
+build_composed_nav() {
     final_nav="$nav"
     final_header_brand="$header_brand"
     final_header_search=""
@@ -285,9 +266,65 @@ render_markdown() {
         final_nav="$SEARCH_FORM_NAV
 $nav"
     fi
+}
+
+prepare_post_content() {
+    content_file="$file"
+    if [ -n "$posts_dir" ] && [ "$file" != "$src/$posts_dir/index.md" ]; then
+        rel_dir_of_url=$(dirname "$current_url")
+        rel_dir_of_url="${rel_dir_of_url#/}"
+        if { [ "$rel_dir_of_url" = "$posts_dir" ] || [ "./$rel_dir_of_url" = "$posts_dir" ]; } && [ "$(basename "$current_url")" != "index.html" ]; then
+            temp_post_with_backlink="$KEWT_TMPDIR/post_with_backlink_$$.md"
+            printf "[< Back](index.html)\n\n" > "$temp_post_with_backlink"
+            awk -f "$awk_dir/frontmatter.awk" "$file" >> "$temp_post_with_backlink"
+
+            post_md_name="$(basename "$current_url" .html).md"
+            prevnext_file="$KEWT_TMPDIR/prevnext/$post_md_name"
+            if [ -f "$prevnext_file" ]; then
+                IFS='|' read -r prev_str next_str < "$prevnext_file"
+
+                printf "\n\n---\n<div class=\"post-nav\">\n" >> "$temp_post_with_backlink"
+                if [ -n "$prev_str" ]; then
+                    printf "<span class=\"prev-post\">%s</span>\n" "$prev_str" >> "$temp_post_with_backlink"
+                fi
+                if [ -n "$next_str" ]; then
+                    printf "<span class=\"next-post\">%s</span>\n" "$next_str" >> "$temp_post_with_backlink"
+                fi
+                printf "</div>\n" >> "$temp_post_with_backlink"
+            fi
+            content_file="$temp_post_with_backlink"
+        fi
+    fi
+}
+
+render_markdown() {
+    file="$1"
+    is_home="$2"
+    url_override="$3"
+
+    if [ -n "$url_override" ]; then
+        current_url="$url_override"
+    else
+        rel_path="${file#"$src"}"
+        rel_path="${rel_path#/}"
+        current_url=$(markdown_file_url "$rel_path")
+    fi
+
+    prepare_post_content
+    resolve_render_template "$file"
+    resolve_render_style_path "$file"
+    build_header_brand_html
+    build_favicon_head
+    parse_frontmatter "$file"
+    build_page_title
+    build_og_tags
+    build_cw_url_hide
+    build_composed_footer
+    build_composed_nav
 
     ENABLE_HEADER_LINKS="$enable_header_links" CUSTOM_ADMONITIONS="$custom_admonitions" MARKDOWN_SITE_ROOT="$src" MARKDOWN_FALLBACK_FILE="$script_dir/styles/$style.css" sh "$script_dir/markdown.sh" "$content_file" | AWK_LANG="$lang" AWK_CURRENT_URL="$current_url" AWK_TITLE="$page_title" AWK_NAV="$final_nav" AWK_FOOTER="$final_footer" AWK_STYLE_PATH="${style_path}" AWK_HEADER_BRAND="$final_header_brand" AWK_HEADER_SEARCH="$final_header_search" AWK_HEAD_EXTRA="$head_extra" AWK_VERSION="$asset_version" AWK_CONTENT_WARNING="$fm_content_warning" awk -f "$awk_dir/render_template.awk" "$local_template"
 }
+
 generate_content_warning_page() {
     _fm_title="$1"
     _fm_content_warning="$2"
diff --git a/lib/manifest.sh b/lib/manifest.sh
index b7f3b01..16b980b 100644
--- a/lib/manifest.sh
+++ b/lib/manifest.sh
@@ -1,4 +1,5 @@
 #!/bin/sh
+# shellcheck disable=SC2016,SC2030,SC2031
 
 shell_quote() {
     printf "'%s'" "$(printf '%s' "$1" | sed "s/'/'\\\\''/g")"
diff --git a/markdown.sh b/markdown.sh
index d75dbcb..5b93a7f 100755
--- a/markdown.sh
+++ b/markdown.sh
@@ -3,14 +3,11 @@
 script_dir=$(CDPATH="" cd -- "$(dirname -- "$0")" && pwd)
 awk_dir="$script_dir/awk"
 
-sed_inplace() {
-    script="$1"
-    file="$2"
-    tmp="${file}.tmp.$$"
-    if sed "$script" "$file" > "$tmp" && mv "$tmp" "$file"; then
-        return 0
-    else
-        rm -f "$tmp"
+run_awk() {
+    _ra_awk_file="$1"
+    shift
+    if ! awk -f "$_ra_awk_file" "$@"; then
+        echo "Error: AWK failed: $_ra_awk_file" >&2
         return 1
     fi
 }
@@ -21,36 +18,20 @@ cat "$@" > "$temp_file"
 
 trap 'rm -f "$temp_file" "$temp_file.tmp" "$temp_file.fm"' EXIT INT TERM
 
-# Frontmatter
 fm_file="$temp_file.fm"
 : > "$fm_file"
-awk -v fm_out="$fm_file" -f "$awk_dir/frontmatter.awk" "$temp_file" > "$temp_file.tmp" && mv "$temp_file.tmp" "$temp_file"
 
-# Mask
-awk -f "$awk_dir/mask_inline_code.awk" "$temp_file" > "$temp_file.tmp" && mv "$temp_file.tmp" "$temp_file"
-awk -f "$awk_dir/mask_plain.awk" "$temp_file" > "$temp_file.tmp" && mv "$temp_file.tmp" "$temp_file"
+run_awk "$awk_dir/frontmatter.awk" -v fm_out="$fm_file" "$temp_file" > "$temp_file.tmp" && mv "$temp_file.tmp" "$temp_file"
 
-# Reference links
-refs=$(awk '/^\[[^\]]+\]:  */' "$temp_file")
-IFS='
-'
-for ref in $refs; do
-    ref_id=$(echo "$ref" | sed 's/^\[\(.*\)\]: .*/\1/')
-    ref_url=$(echo "$ref" | sed 's/^\[.*\]: \([^ ]*\).*/\1/')
-    ref_title=$(echo "$ref" | sed -n 's/^\[.*\]: [^ ]* "\(.*\)"/\1/p' | sed 's@|@!@g')
-    sed_inplace "s|!\[\([^]]*\)\]\[$ref_id\]|<img src=\"$ref_url\" title=\"$ref_title\" alt=\"\1\" />|g" "$temp_file"
-    sed_inplace "s|\[\([^]]*\)\]\[$ref_id\]|<a href=\"$ref_url\" title=\"$ref_title\">\1</a>|g" "$temp_file"
-    sed_inplace "s|!\[$ref_id\]\[\]|<img src=\"$ref_url\" title=\"$ref_title\" alt=\"$ref_id\" />|g" "$temp_file"
-    sed_inplace "s|\[$ref_id\]\[\]|<a href=\"$ref_url\" title=\"$ref_title\">$ref_id</a>|g" "$temp_file"
-done
-sed_inplace "/^\[[^\]]*\]:  */d" "$temp_file"
-
-# Blocks
+run_awk "$awk_dir/mask_inline_code.awk" "$temp_file" \
+    | run_awk "$awk_dir/mask_plain.awk" \
+    | run_awk "$awk_dir/reference_links.awk" \
+    > "$temp_file.tmp" && mv "$temp_file.tmp" "$temp_file"
 
 loop_count=0
 max_iterations=100
-while grep '^>' "$temp_file" >/dev/null; do
-    awk -f "$awk_dir/blockquote.awk" "$temp_file" > "$temp_file.tmp" && mv "$temp_file.tmp" "$temp_file"
+while grep -q '^>' "$temp_file"; do
+    run_awk "$awk_dir/blockquote.awk" "$temp_file" > "$temp_file.tmp" && mv "$temp_file.tmp" "$temp_file"
     loop_count=$((loop_count + 1))
     if [ "$loop_count" -gt "$max_iterations" ]; then
         echo "Warning: Blockquote processing exceeded $max_iterations iterations on $1. Breaking to prevent infinite loop." >&2
@@ -58,25 +39,19 @@ while grep '^>' "$temp_file" >/dev/null; do
     fi
 done
 
-awk -v custom_admonitions="$CUSTOM_ADMONITIONS" -f "$awk_dir/blockquote_to_admonition.awk" "$temp_file" > "$temp_file.tmp" && mv "$temp_file.tmp" "$temp_file"
-awk -f "$awk_dir/fenced_code.awk" "$temp_file" > "$temp_file.tmp" && mv "$temp_file.tmp" "$temp_file"
-awk -f "$awk_dir/indented_code.awk" "$temp_file" > "$temp_file.tmp" && mv "$temp_file.tmp" "$temp_file"
-awk -f "$awk_dir/pipe_tables.awk" "$temp_file" > "$temp_file.tmp" && mv "$temp_file.tmp" "$temp_file"
-awk -f "$awk_dir/definition_lists.awk" "$temp_file" > "$temp_file.tmp" && mv "$temp_file.tmp" "$temp_file"
-awk -f "$awk_dir/lists.awk" "$temp_file" > "$temp_file.tmp" && mv "$temp_file.tmp" "$temp_file"
+run_awk "$awk_dir/blockquote_to_admonition.awk" -v custom_admonitions="$CUSTOM_ADMONITIONS" "$temp_file" \
+    | run_awk "$awk_dir/fenced_code.awk" \
+    | run_awk "$awk_dir/indented_code.awk" \
+    | run_awk "$awk_dir/pipe_tables.awk" \
+    | run_awk "$awk_dir/definition_lists.awk" \
+    | run_awk "$awk_dir/lists.awk" \
+    | run_awk "$awk_dir/toc.awk" \
+    | run_awk "$awk_dir/footnotes.awk" \
+    | run_awk "$awk_dir/breaks.awk" \
+    | run_awk "$awk_dir/paragraphs.awk" \
+    | run_awk "$awk_dir/emoji.awk" -v emoji_file="$awk_dir/emoji.tsv" \
+    | run_awk "$awk_dir/markdown_inline.awk" \
+    | run_awk "$awk_dir/headers.awk" -v enable_header_links="$ENABLE_HEADER_LINKS" \
+    | run_awk "$awk_dir/markdown_embed.awk" -v input_file="$1" -v site_root="$MARKDOWN_SITE_ROOT" -v fallback_file="$MARKDOWN_FALLBACK_FILE" -v script_dir="$script_dir"
 
-# TOC
-awk -f "$awk_dir/toc.awk" "$temp_file" > "$temp_file.tmp" && mv "$temp_file.tmp" "$temp_file"
-# Footnotes
-awk -f "$awk_dir/footnotes.awk" "$temp_file" > "$temp_file.tmp" && mv "$temp_file.tmp" "$temp_file"
-
-# Spacing
-awk -f "$awk_dir/breaks.awk" "$temp_file" > "$temp_file.tmp" && mv "$temp_file.tmp" "$temp_file"
-awk -f "$awk_dir/paragraphs.awk" "$temp_file" > "$temp_file.tmp" && mv "$temp_file.tmp" "$temp_file"
-
-# Inline styles
-awk -v emoji_file="$awk_dir/emoji.tsv" -f "$awk_dir/emoji.awk" "$temp_file" > "$temp_file.tmp" && mv "$temp_file.tmp" "$temp_file"
-awk -f "$awk_dir/markdown_inline.awk" "$temp_file" > "$temp_file.tmp" && mv "$temp_file.tmp" "$temp_file"
-awk -v enable_header_links="$ENABLE_HEADER_LINKS" -f "$awk_dir/headers.awk" "$temp_file" > "$temp_file.tmp" && mv "$temp_file.tmp" "$temp_file"
-awk -v input_file="$1" -v site_root="$MARKDOWN_SITE_ROOT" -v fallback_file="$MARKDOWN_FALLBACK_FILE" -v script_dir="$script_dir" -f "$awk_dir/markdown_embed.awk" "$temp_file"
-rm "$temp_file"
+rm -f "$temp_file"
diff --git a/tests/test_config.sh b/tests/test_config.sh
new file mode 100755
index 0000000..4df6cfb
--- /dev/null
+++ b/tests/test_config.sh
@@ -0,0 +1,106 @@
+test_config_defaults() {
+    . "$project_dir/lib/config.sh"
+
+    assert_eq "kewt" "$title" "default title"
+    assert_eq "kewt" "$style" "default style"
+    assert_eq "en" "$lang" "default lang"
+    assert_eq "false" "$draft_by_default" "default draft_by_default"
+    assert_eq "true" "$dir_indexes" "default dir_indexes"
+    assert_eq "true" "$single_file_index" "default single_file_index"
+    assert_eq "false" "$flatten" "default flatten"
+    assert_eq "Home" "$home_name" "default home_name"
+    assert_eq "true" "$show_home_in_nav" "default show_home_in_nav"
+    assert_eq "false" "$generate_feed" "default generate_feed"
+    assert_eq "rss.xml" "$feed_file" "default feed_file"
+    assert_eq "12" "$posts_per_page" "default posts_per_page"
+    assert_eq "false" "$generate_tags" "default generate_tags"
+    assert_eq "tags" "$tags_dir" "default tags_dir"
+    assert_eq "false" "$generate_search" "default generate_search"
+    assert_eq "true" "$enable_header_links" "default enable_header_links"
+    assert_eq "true" "$cw_hide_url" "default cw_hide_url"
+}
+
+test_config_reset() {
+    . "$project_dir/lib/config.sh"
+    title="custom"
+    style="nord"
+    generate_feed="true"
+    reset_config
+
+    assert_eq "kewt" "$title" "reset title"
+    assert_eq "kewt" "$style" "reset style"
+    assert_eq "false" "$generate_feed" "reset generate_feed"
+}
+
+test_config_load() {
+    . "$project_dir/lib/config.sh"
+
+    tmpdir="${TMPDIR:-/tmp}/kewt_test.$$"
+    mkdir -p "$tmpdir"
+    cat > "$tmpdir/test.conf" <<EOF
+title = "My Site"
+style = "nord"
+generate_feed = true
+base_url = "https://example.com"
+posts_per_page = 5
+EOF
+
+    reset_config
+    load_config "$tmpdir/test.conf"
+
+    assert_eq "My Site" "$title" "load title"
+    assert_eq "nord" "$style" "load style"
+    assert_eq "true" "$generate_feed" "load generate_feed"
+    assert_eq "https://example.com" "$base_url" "load base_url"
+    assert_eq "5" "$posts_per_page" "load posts_per_page"
+
+    rm -rf "$tmpdir"
+}
+
+test_config_load_quoted() {
+    . "$project_dir/lib/config.sh"
+
+    tmpdir="${TMPDIR:-/tmp}/kewt_test.$$"
+    mkdir -p "$tmpdir"
+    cat > "$tmpdir/test.conf" <<'EOF'
+footer = "made with <a href=\"https://kewt.krzak.org\">kewt</a>"
+nav_links = "[Docs](/docs), [About](/about)"
+EOF
+
+    reset_config
+    load_config "$tmpdir/test.conf"
+
+    assert_eq 'made with <a href="https://kewt.krzak.org">kewt</a>' "$footer" "load quoted footer"
+    assert_eq "[Docs](/docs), [About](/about)" "$nav_links" "load quoted nav_links"
+
+    rm -rf "$tmpdir"
+}
+
+test_config_load_skips_comments() {
+    . "$project_dir/lib/config.sh"
+
+    tmpdir="${TMPDIR:-/tmp}/kewt_test.$$"
+    mkdir -p "$tmpdir"
+    cat > "$tmpdir/test.conf" <<EOF
+# This is a comment
+title = "Test Site"
+# Another comment
+style = "kewt"
+EOF
+
+    reset_config
+    load_config "$tmpdir/test.conf"
+
+    assert_eq "Test Site" "$title" "load with comments title"
+    assert_eq "kewt" "$style" "load with comments style"
+
+    rm -rf "$tmpdir"
+}
+
+test_config_load_missing_file() {
+    . "$project_dir/lib/config.sh"
+    reset_config
+    load_config "/nonexistent/path/site.conf"
+
+    assert_eq "kewt" "$title" "missing file keeps defaults"
+}
diff --git a/tests/test_metadata.sh b/tests/test_metadata.sh
new file mode 100755
index 0000000..6a57e0a
--- /dev/null
+++ b/tests/test_metadata.sh
@@ -0,0 +1,92 @@
+test_strip_markdown_bold() {
+    . "$project_dir/lib/metadata.sh"
+    result=$(strip_markdown_text "**bold text**")
+    assert_eq "bold text" "$result" "strip bold"
+}
+
+test_strip_markdown_italic() {
+    . "$project_dir/lib/metadata.sh"
+    result=$(strip_markdown_text "*italic text*")
+    assert_eq "italic text" "$result" "strip italic"
+}
+
+test_strip_markdown_link() {
+    . "$project_dir/lib/metadata.sh"
+    result=$(strip_markdown_text "[link](http://example.com)")
+    assert_eq "link" "$result" "strip link"
+}
+
+test_strip_markdown_code() {
+    . "$project_dir/lib/metadata.sh"
+    result=$(strip_markdown_text "\`code\`")
+    assert_eq "code" "$result" "strip code"
+}
+
+test_first_heading() {
+    tmpdir="${TMPDIR:-/tmp}/kewt_test.$$"
+    mkdir -p "$tmpdir"
+    printf '# Hello World\n\nSome content\n' > "$tmpdir/test.md"
+
+    . "$project_dir/lib/metadata.sh"
+    result=$(first_heading_from_markdown "$tmpdir/test.md")
+    assert_eq "Hello World" "$result" "first heading"
+
+    rm -rf "$tmpdir"
+}
+
+test_first_heading_no_heading() {
+    tmpdir="${TMPDIR:-/tmp}/kewt_test.$$"
+    mkdir -p "$tmpdir"
+    printf 'Random content\n' > "$tmpdir/test.md"
+
+    . "$project_dir/lib/metadata.sh"
+    result=$(first_heading_from_markdown "$tmpdir/test.md")
+    assert_eq "" "$result" "no heading returns empty"
+
+    rm -rf "$tmpdir"
+}
+
+test_parse_frontmatter() {
+    tmpdir="${TMPDIR:-/tmp}/kewt_test.$$"
+    mkdir -p "$tmpdir"
+    cat > "$tmpdir/test.md" <<'EOF'
+---
+title = "My Post"
+date = "2026-05-20 10:00"
+draft = false
+description = "A test post"
+tags = "test, example"
+---
+
+# Content
+EOF
+
+    export KEWT_TMPDIR="$tmpdir"
+    export awk_dir="$project_dir/awk"
+    . "$project_dir/lib/metadata.sh"
+    . "$project_dir/lib/config.sh"
+
+    parse_frontmatter "$tmpdir/test.md"
+
+    assert_eq "My Post" "$fm_title" "parse title"
+    assert_eq "2026-05-20 10:00" "$fm_date" "parse date"
+    assert_eq "false" "$fm_draft" "parse draft"
+    assert_eq "A test post" "$fm_description" "parse description"
+    assert_eq "test, example" "$fm_tags" "parse tags"
+
+    rm -rf "$tmpdir"
+}
+
+test_set_post_datetime_from_date() {
+    . "$project_dir/lib/metadata.sh"
+    set_post_datetime "2026-05-20 14:30" "fallback"
+    assert_eq "2026-05-20" "$post_date" "post date from date field"
+    assert_eq "14:30" "$post_time" "post time from date field"
+}
+
+test_set_post_datetime_from_filename() {
+    . "$project_dir/lib/metadata.sh"
+    set_post_datetime "" "2026-05-20-14-30-slug"
+    assert_eq "2026-05-20" "$post_date" "post date from filename"
+    assert_eq "14:30" "$post_time" "post time from filename"
+}
diff --git a/tests/test_runner.sh b/tests/test_runner.sh
new file mode 100755
index 0000000..40ac361
--- /dev/null
+++ b/tests/test_runner.sh
@@ -0,0 +1,93 @@
+#!/bin/sh
+
+script_dir=$(CDPATH="" cd -- "$(dirname -- "$0")" && pwd)
+project_dir=$(CDPATH="" cd -- "$script_dir/.." && pwd)
+
+passed=0
+failed=0
+total=0
+
+assert_eq() {
+    total=$((total + 1))
+    expected="$1"
+    actual="$2"
+    label="$3"
+
+    if [ "$expected" = "$actual" ]; then
+        passed=$((passed + 1))
+        printf "  PASS: %s\n" "$label"
+    else
+        failed=$((failed + 1))
+        printf "  FAIL: %s\n" "$label"
+        printf "    expected: %s\n" "$expected"
+        printf "    actual:   %s\n" "$actual"
+    fi
+}
+
+assert_contains() {
+    total=$((total + 1))
+    needle="$1"
+    haystack="$2"
+    label="$3"
+
+    case "$haystack" in
+        *"$needle"*)
+            passed=$((passed + 1))
+            printf "  PASS: %s\n" "$label"
+            ;;
+        *)
+            failed=$((failed + 1))
+            printf "  FAIL: %s\n" "$label"
+            printf "    expected to contain: %s\n" "$needle"
+            printf "    actual: %s\n" "$haystack"
+            ;;
+    esac
+}
+
+assert_file_exists() {
+    total=$((total + 1))
+    path="$1"
+    label="$2"
+
+    if [ -f "$path" ]; then
+        passed=$((passed + 1))
+        printf "  PASS: %s\n" "$label"
+    else
+        failed=$((failed + 1))
+        printf "  FAIL: %s\n" "$label"
+        printf "    file not found: %s\n" "$path"
+    fi
+}
+
+run_test_file() {
+    test_file="$1"
+    test_name=$(basename "$test_file" .sh)
+    printf "\n== %s ==\n" "$test_name"
+
+    saved_total=$total
+    saved_passed=$passed
+    saved_failed=$failed
+
+    . "$test_file"
+
+    for func in $(grep '^test_' "$test_file" | sed 's/().*//' | sort -u); do
+        $func
+    done
+
+    file_total=$((total - saved_total))
+    file_passed=$((passed - saved_passed))
+    file_failed=$((failed - saved_failed))
+    if [ "$file_total" -eq 0 ]; then
+        printf "  (no tests found)\n"
+    fi
+}
+
+for test_file in "$script_dir"/test_*.sh; do
+    [ "$(basename "$test_file")" = "test_runner.sh" ] && continue
+    run_test_file "$test_file"
+done
+
+printf "\n== Results ==\n"
+printf "  %d passed, %d failed, %d total\n" "$passed" "$failed" "$total"
+
+[ "$failed" -eq 0 ] && exit 0 || exit 1
diff --git a/tests/test_runtime.sh b/tests/test_runtime.sh
new file mode 100755
index 0000000..ff2d128
--- /dev/null
+++ b/tests/test_runtime.sh
@@ -0,0 +1,71 @@
+test_url_encode_spaces() {
+    . "$project_dir/lib/runtime.sh"
+    result=$(encode_url_path "hello world")
+    assert_eq "hello%20world" "$result" "encode spaces"
+}
+
+test_url_encode_hash() {
+    . "$project_dir/lib/runtime.sh"
+    result=$(encode_url_path "file#section")
+    assert_eq "file%23section" "$result" "encode hash"
+}
+
+test_url_encode_question() {
+    . "$project_dir/lib/runtime.sh"
+    result=$(encode_url_path "search?q=test")
+    assert_eq "search%3Fq=test" "$result" "encode question mark"
+}
+
+test_url_encode_percent() {
+    . "$project_dir/lib/runtime.sh"
+    result=$(encode_url_path "100%")
+    assert_eq "100%25" "$result" "encode percent"
+}
+
+test_markdown_file_url() {
+    . "$project_dir/lib/runtime.sh"
+    result=$(markdown_file_url "docs/readme.md")
+    assert_eq "/docs/readme.html" "$result" "markdown file url"
+}
+
+test_directory_index_url_root() {
+    . "$project_dir/lib/runtime.sh"
+    result=$(directory_index_url "")
+    assert_eq "/index.html" "$result" "root index url"
+}
+
+test_directory_index_url_subdir() {
+    . "$project_dir/lib/runtime.sh"
+    result=$(directory_index_url "docs")
+    assert_eq "/docs/index.html" "$result" "subdir index url"
+}
+
+test_directory_index_url_dot() {
+    . "$project_dir/lib/runtime.sh"
+    result=$(directory_index_url ".")
+    assert_eq "/index.html" "$result" "dot index url"
+}
+
+test_format_rfc2822_utc() {
+    . "$project_dir/lib/runtime.sh"
+    result=$(format_rfc2822_utc "2026-05-20" "14:30")
+    assert_eq "Wed, 20 May 2026 14:30:00 +0000" "$result" "rfc2822 format"
+}
+
+test_format_rfc2822_utc_default_time() {
+    . "$project_dir/lib/runtime.sh"
+    result=$(format_rfc2822_utc "2026-01-01")
+    assert_eq "Thu, 01 Jan 2026 00:00:00 +0000" "$result" "rfc2822 default time"
+}
+
+test_trim_whitespace() {
+    . "$project_dir/lib/runtime.sh"
+    result=$(trim_whitespace "  hello  ")
+    assert_eq "hello" "$result" "trim whitespace"
+}
+
+test_trim_whitespace_tabs() {
+    . "$project_dir/lib/runtime.sh"
+    result=$(trim_whitespace "	world	")
+    assert_eq "world" "$result" "trim tabs"
+}