diff --git a/src/awk/approx.awk b/src/awk/approx.awk
index 23de871..bc1957d 100644
--- a/src/awk/approx.awk
+++ b/src/awk/approx.awk
@@ -10,6 +10,7 @@
 ## 5. filename (collection/name)
 ##
 ## @assign collection_labels: See configuration of the current program.
+## @assign style_line: Style for each line
 
 @include "lib/awk/icalendar.awk"
 
@@ -38,7 +39,7 @@ function title(start, summary) {
   depth = split(FILENAME, path, "/")
   collection = depth > 1 ? path[depth-1] : ""
   collection = collection in collection2label ? collection2label[collection] : collection
-  return FAINT "~ " collection " " gensub(/^[^0-9]*([0-9]{4})([0-9]{2}).*$/, "\\1-\\2", "1", start) " " summary OFF
+  return style_line "~ " collection " " gensub(/^[^0-9]*([0-9]{4})([0-9]{2}).*$/, "\\1-\\2", "1", start) " " summary OFF
 }
 
 # AWK program
@@ -52,7 +53,6 @@ BEGIN {
     collection2label[m[1]] = m[2]
   }
   # Colors
-  FAINT = "\033[2m"
   OFF = "\033[m"
 }
 BEGINFILE             { inside = 0; rs = 0; dur = 0; summary = ""; start = "ERROR"; end = "ERROR" }
diff --git a/src/awk/calannot.awk b/src/awk/calannot.awk
index 47473eb..a02bd52 100644
--- a/src/awk/calannot.awk
+++ b/src/awk/calannot.awk
@@ -3,22 +3,20 @@
 ##
 ## @assign cur: Day-of-month to mark as `today`
 ## @assign day: Day-of-month to highlight
+## @assign style_month: Theme to use for month
+## @assign style_weekdays: Theme to use for weekdays
+## @assign style_cur: Theme to use for current day 
+## @assign style_highlight: Theme to use for highlighted day
 
 BEGIN {
-  BLACK = "\033[1;30m"
-  GREEN = "\033[1;32m"
-  RED = "\033[1;31m"
-  FAINT = "\033[2m"
-  BOLD = "\033[1m"
-  BG = "\033[41m"
   OFF = "\033[m"
   day = day + 0
   cur = cur + 0
 }
-NR == 1 { print GREEN $0 OFF; next }
-NR == 2 { print FAINT $0 OFF; next }
+NR == 1 { print style_month $0 OFF; next }
+NR == 2 { print style_weekdays $0 OFF; next }
 { 
-  sub("\\y"cur"\\y", BG BLACK BOLD cur OFF)
-  sub("\\y"day"\\y", RED BOLD day OFF)
+  sub("\\y"cur"\\y", style_cur cur OFF)
+  sub("\\y"day"\\y", style_highlight day OFF)
   print
 }
diff --git a/src/awk/dayview.awk b/src/awk/dayview.awk
index 716ea43..11ba594 100644
--- a/src/awk/dayview.awk
+++ b/src/awk/dayview.awk
@@ -21,6 +21,13 @@
 ## @assign today: Date of `today` in the format %D (%m/%d/%y)
 ## @assign daystart: Hour of start of the day
 ## @assign dayend: Hour of end of the day
+## @assign style_allday
+## @assign style_timerange
+## @assign style_confirmed
+## @assign style_tentative
+## @assign style_cancelled
+## @assign style_hour
+## @assign style_emptyhour
 
 # Functions
 
@@ -29,7 +36,7 @@
 # @input status: Event status, one of TENTATIVE, CONFIRMED, CANCELLED
 # @return: Color modifier
 function color_from_status(status) {
-  return status == "CANCELLED" ? STRIKE CYAN : status == "TENTATIVE" ? FAINT CYAN : CYAN
+  return status == "CANCELLED" ? style_cancelled : status == "TENTATIVE" ? style_tentative : style_confirmed
 }
 
 # Return line for all-day event.
@@ -41,7 +48,7 @@ function color_from_status(status) {
 # @return: Single-line string
 function allday(collection, desc, status,    color) {
   color = color_from_status(status)
-  return collection " " LIGHT_CYAN ITALIC FAINT "    (allday)   " OFF color desc OFF
+  return collection " " style_allday
 }
 
 # Return line for multi-day event, or event that starts at midnight, which ends today.
@@ -54,7 +61,7 @@ function allday(collection, desc, status,    color) {
 # @return: Single-line string
 function endstoday(stop, collection, desc, status) {
   color = color_from_status(status)
-  return collection " " LIGHT_CYAN "      → " stop ": " OFF color desc OFF
+  return collection " " style_timerange "      → " stop ": " OFF color desc OFF
 }
 
 # Return line for event that starts sometime today.
@@ -69,9 +76,9 @@ function endstoday(stop, collection, desc, status) {
 function slice(start, stop, collection, desc, status) {
   color = color_from_status(status)
   if (stop == "00:00")
-    return collection " " LIGHT_CYAN start " →      " ": " OFF color desc OFF
+    return collection " " style_timerange start " →      " ": " OFF color desc OFF
    else
-    return collection " " LIGHT_CYAN start " – " stop ": " OFF color desc OFF
+    return collection " " style_timerange start " – " stop ": " OFF color desc OFF
 }
 
 # Print line for a single hour entry.
@@ -79,7 +86,7 @@ function slice(start, stop, collection, desc, status) {
 # @input hour: Hour of the entry
 function hrline(hour) {
   hour = hour < 10 ? "0"hour : hour
-  print today, hour, "", "", "", "   " FAINT hour ":00          ----------------------" OFF
+  print today, hour, "", "", "", "   " style_hou hour ":00" OFF "          " style_emptyhour
 }
 
 # Print lines for hour entries before an event that starts at `start` and stops
@@ -107,11 +114,6 @@ function hrlines(start, stop, h,    starth, stoph, tmp, i) {
 BEGIN {
   FS = "\t"
   OFS = "\t"
-  LIGHT_CYAN = "\033[1;36m"
-  CYAN = "\033[1;36m"
-  ITALIC = "\033[3m"
-  FAINT = "\033[2m"
-  STRIKE = "\033[9m"
   OFF = "\033[m"
 }
 $1 == "00:00" && $2 == "00:00" { print today, $1, $3, $4, $5, allday($6, $7, $8);        next }
diff --git a/src/awk/weekview.awk b/src/awk/weekview.awk
index 09d94cd..b428dcd 100644
--- a/src/awk/weekview.awk
+++ b/src/awk/weekview.awk
@@ -4,6 +4,10 @@
 ##   printf "%s\t%s\t%s\t%s\n" "$i" "$s" "$e" "$description"
 ##
 ## @assign startofweek: Date of first day in the week
+## @assign style_day: Style for dates
+## @assign style_event_delim: Event delimiter
+## @assign style_summary: Style for summary lines
+## @assign style_time: Style for times
 
 # Functions
 
@@ -12,7 +16,7 @@
 # @input desc: String with a description of the event
 # @return: Single-line string
 function c(desc) {
-  return CYAN desc OFF "  " RED "/" OFF
+  return style_summary desc OFF "  " style_event_delim
 }
 
 # AWK program
@@ -20,19 +24,16 @@ function c(desc) {
 BEGIN {
   FS = "\t"
   OFS = "\t"
-  GREEN = "\033[1;32m"
-  RED = "\033[1;31m"
-  CYAN = "\033[1;36m"
   OFF = "\033[m"
 }
 $2 == "00:00" && $3 == "00:00" { dayline = dayline " " c($4); next }
-$2 == "00:00"                  { dayline = dayline " → " $3 " " c($4); next }
-$3 == "00:00"                  { dayline = dayline " " $2 " → " c($4); next }
-NF == 4                        { dayline = dayline " " $2 " – " $3 " " c($4); next }
+$2 == "00:00"                  { dayline = dayline style_time " → " $3 OFF " " c($4); next }
+$3 == "00:00"                  { dayline = dayline style_time " " $2 " → " OFF c($4); next }
+NF == 4                        { dayline = dayline style_time " " $2 " – " $3 OFF " " c($4); next }
 NF == 1 && dayline             { print "+", startofweek " +" $1-1 " days", "", dayline }
 NF == 1 {
   cmd = "date -d '" startofweek " +" $1 " days' +\"%a %e %b %Y\""
   cmd | getline dayline
   close(cmd)
-  dayline = GREEN dayline ":   " OFF
+  dayline = style_day dayline ":   " OFF
 }
diff --git a/src/main.sh b/src/main.sh
index 9a93b50..c389f14 100755
--- a/src/main.sh
+++ b/src/main.sh
@@ -70,9 +70,7 @@ __refresh_data
 
 ### Exports
 # The preview calls run in subprocesses. These require the following variables:
-export ROOT CAT AWK_GET AWK_CALSHIFT AWK_CALANNOT CYAN STRIKE FAINT WHITE ITALIC OFF AWK_ATTACHLS
 # The reload commands also run in subprocesses, and use in addition
-export COLLECTION_LABELS DAY_START DAY_END AWK_DAYVIEW AWK_WEEKVIEW AWK_PARSE
 # as well as the following variables that will be dynamically specified. So, we
 # export them in the main loop using the following function.
 
diff --git a/src/sh/awkscripts.sh b/src/sh/awkscripts.sh
index c429c65..366b94d 100644
--- a/src/sh/awkscripts.sh
+++ b/src/sh/awkscripts.sh
@@ -20,87 +20,102 @@ AWK_APPROX=$(
 @@include awk/approx.awk
 EOF
 )
+export AWK_APPROX
 
 AWK_MERGE=$(
   cat <<'EOF'
 @@include awk/merge.awk
 EOF
 )
+export AWK_MERGE
 
 AWK_PARSE=$(
   cat <<'EOF'
 @@include awk/parse.awk
 EOF
 )
+export AWK_PARSE
 
 AWK_WEEKVIEW=$(
   cat <<'EOF'
 @@include awk/weekview.awk
 EOF
 )
+export AWK_WEEKVIEW
 
 AWK_DAYVIEW=$(
   cat <<'EOF'
 @@include awk/dayview.awk
 EOF
 )
+export AWK_DAYVIEW
 
 AWK_GET=$(
   cat <<'EOF'
 @@include awk/get.awk
 EOF
 )
+export AWK_GET
 
 AWK_UPDATE=$(
   cat <<'EOF'
 @@include awk/update.awk
 EOF
 )
+export AWK_UPDATE
 
 AWK_NEW=$(
   cat <<'EOF'
 @@include awk/new.awk
 EOF
 )
+export AWK_NEW
 
 AWK_CALSHIFT=$(
   cat <<'EOF'
 @@include awk/calshift.awk
 EOF
 )
+export AWK_CALSHIFT
 
 AWK_CALANNOT=$(
   cat <<'EOF'
 @@include awk/calannot.awk
 EOF
 )
+export AWK_CALANNOT
 
 AWK_SET=$(
   cat <<'EOF'
 @@include awk/set.awk
 EOF
 )
+export AWK_SET
 
 AWK_ATTACHLS=$(
   cat <<'EOF'
 @@include awk/attachls.awk
 EOF
 )
+export AWK_ATTACHLS
 
 AWK_ATTACHDD=$(
   cat <<'EOF'
 @@include awk/attachdd.awk
 EOF
 )
+export AWK_ATTACHDD
 
 AWK_ATTACHRM=$(
   cat <<'EOF'
 @@include awk/attachrm.awk
 EOF
 )
+export AWK_ATTACHRM
 
 AWK_ATTACH=$(
   cat <<'EOF'
 @@include awk/attach.awk
 EOF
 )
+export AWK_ATTACH
diff --git a/src/sh/clipreview.sh b/src/sh/clipreview.sh
index b56ee06..becc48c 100644
--- a/src/sh/clipreview.sh
+++ b/src/sh/clipreview.sh
@@ -21,9 +21,9 @@ if [ "${1:-}" = "--preview-event" ]; then
     elif [ "$status" = "CANCELLED" ]; then
       symb="❌"
     fi
-    echo "📅${symb:-} ${CYAN}$start${OFF} → ${CYAN}$end${OFF}"
+    echo "📅${symb:-} ${STYLE_EPV_DATETIME}$start${OFF} → ${STYLE_EPV_DATETIME}$end${OFF}"
     if [ -n "${location:-}" ]; then
-      echo "📍 ${CYAN}$location${OFF}"
+      echo "📍 ${STYLE_EPV_LOCATION}$location${OFF}"
     fi
     attcnt=$(awk "$AWK_ATTACHLS" "$fpath" | wc -l)
     if [ "$attcnt" -gt 0 ]; then
@@ -88,12 +88,12 @@ if [ "${1:-}" = "--preview-week" ]; then
     fi
     # show
     (
-      cal "$month_pre2" "$year_pre2" | awk "$AWK_CALSHIFT" | awk -v cur="${var_pre2:-}" "$AWK_CALANNOT"
-      cal "$month_pre" "$year_pre" | awk "$AWK_CALSHIFT" | awk -v cur="${var_pre:-}" "$AWK_CALANNOT"
-      cal "$month" "$year" | awk "$AWK_CALSHIFT" | awk -v cur="${var:-}" -v day="$day" "$AWK_CALANNOT"
-      cal "$month_nex" "$year_nex" | awk "$AWK_CALSHIFT" | awk -v cur="${var_nex:-}" "$AWK_CALANNOT"
-      cal "$month_nex2" "$year_nex2" | awk "$AWK_CALSHIFT" | awk -v cur="${var_nex2:-}" "$AWK_CALANNOT"
-      cal "$month_nex3" "$year_nex3" | awk "$AWK_CALSHIFT" | awk -v cur="${var_nex3:-}" "$AWK_CALANNOT"
+      cal "$month_pre2" "$year_pre2" | awk "$AWK_CALSHIFT" | awk -v cur="${var_pre2:-}" -v style_month="$STYLE_CALENDAR_MONTH" -v style_weekdays="$STYLE_CALENDAR_WEEKDAYS" -v style_cur="$STYLE_CALENDAR_CURRENT_DAY" -v style_highlight="$STYLE_CALENDAR_HL_DAY" -v style_weekdays="$STYLE_CALENDAR_WEEKDAYS" -v style_cur="$STYLE_CALENDAR_CURRENT_DAY" -v style_highlight="$STYLE_CALENDAR_HL_DAY" "$AWK_CALANNOT"
+      cal "$month_pre" "$year_pre" | awk "$AWK_CALSHIFT" | awk -v cur="${var_pre:-}" -v style_month="$STYLE_CALENDAR_MONTH" -v style_weekdays="$STYLE_CALENDAR_WEEKDAYS" -v style_cur="$STYLE_CALENDAR_CURRENT_DAY" -v style_highlight="$STYLE_CALENDAR_HL_DAY" "$AWK_CALANNOT"
+      cal "$month" "$year" | awk "$AWK_CALSHIFT" | awk -v cur="${var:-}" -v day="$day" -v style_month="$STYLE_CALENDAR_MONTH" -v style_weekdays="$STYLE_CALENDAR_WEEKDAYS" -v style_cur="$STYLE_CALENDAR_CURRENT_DAY" -v style_highlight="$STYLE_CALENDAR_HL_DAY" "$AWK_CALANNOT"
+      cal "$month_nex" "$year_nex" | awk "$AWK_CALSHIFT" | awk -v cur="${var_nex:-}" -v style_month="$STYLE_CALENDAR_MONTH" -v style_weekdays="$STYLE_CALENDAR_WEEKDAYS" -v style_cur="$STYLE_CALENDAR_CURRENT_DAY" -v style_highlight="$STYLE_CALENDAR_HL_DAY" "$AWK_CALANNOT"
+      cal "$month_nex2" "$year_nex2" | awk "$AWK_CALSHIFT" | awk -v cur="${var_nex2:-}" -v style_month="$STYLE_CALENDAR_MONTH" -v style_weekdays="$STYLE_CALENDAR_WEEKDAYS" -v style_cur="$STYLE_CALENDAR_CURRENT_DAY" -v style_highlight="$STYLE_CALENDAR_HL_DAY" "$AWK_CALANNOT"
+      cal "$month_nex3" "$year_nex3" | awk "$AWK_CALSHIFT" | awk -v cur="${var_nex3:-}" -v style_month="$STYLE_CALENDAR_MONTH" -v style_weekdays="$STYLE_CALENDAR_WEEKDAYS" -v style_cur="$STYLE_CALENDAR_CURRENT_DAY" -v style_highlight="$STYLE_CALENDAR_HL_DAY" "$AWK_CALANNOT"
     ) | awk '{ l[NR%8] = l[NR%8] "    " $0 } END {for (i in l) if (i>0) print l[i] }'
   fi
   exit
diff --git a/src/sh/config.sh b/src/sh/config.sh
index 56934a5..4ff88ab 100644
--- a/src/sh/config.sh
+++ b/src/sh/config.sh
@@ -20,15 +20,16 @@ if [ -z "${ROOT:-}" ] || [ -z "${COLLECTION_LABELS:-}" ]; then
   err "Configuration is incomplete."
   exit 1
 fi
-SYNC_CMD=${SYNC_CMD:-echo 'Synchronization disabled'}
-DAY_START=${DAY_START:-8}
-DAY_END=${DAY_END:-18}
-ZI_DIR=${ZI_DIR:-/usr/share/zoneinfo/posix}
+export ROOT COLLECTION_LABELS
+export SYNC_CMD=${SYNC_CMD:-echo 'Synchronization disabled'}
+export DAY_START=${DAY_START:-8}
+export DAY_END=${DAY_END:-18}
+export ZI_DIR=${ZI_DIR:-/usr/share/zoneinfo/posix}
 if [ ! -d "$ZI_DIR" ]; then
   err "Could not determine time-zone information"
   exit 1
 fi
-OPEN=${OPEN:-open}
+export OPEN=${OPEN:-open}
 
 # Check and load required tools
 # - FZF:     Fuzzy finder `fzf``
@@ -39,14 +40,14 @@ OPEN=${OPEN:-open}
 # The presence of POSIX tools is not checked.
 
 if command -v "fzf" >/dev/null; then
-  FZF="fzf --black"
+  export FZF="fzf --black"
 else
   err "Did not find the command-line fuzzy finder fzf."
   exit 1
 fi
 
 if command -v "uuidgen" >/dev/null; then
-  UUIDGEN="uuidgen"
+  export UUIDGEN="uuidgen"
 else
   err "Did not find the uuidgen command."
   exit 1
@@ -58,8 +59,8 @@ elif command -v "batcat" >/dev/null; then
   CAT="batcat"
 fi
 CAT=${CAT:+$CAT --color=always --style=numbers --language=md}
-CAT=${CAT:-cat}
+export CAT=${CAT:-cat}
 
 if command -v "git" >/dev/null && [ -d "$ROOT/.git" ]; then
-  GIT="git -C $ROOT"
+  export GIT="git -C $ROOT"
 fi
diff --git a/src/sh/load.sh b/src/sh/load.sh
index bc2a129..810ca21 100644
--- a/src/sh/load.sh
+++ b/src/sh/load.sh
@@ -9,6 +9,7 @@ __load_approx_data() {
     xargs -0 -P0 \
       awk \
       -v collection_labels="$COLLECTION_LABELS" \
+      -v style_line="$STYLE_LV" \
       "$AWK_APPROX"
 }
 
diff --git a/src/sh/theme.sh b/src/sh/theme.sh
index 25cd566..b0cb784 100644
--- a/src/sh/theme.sh
+++ b/src/sh/theme.sh
@@ -1,8 +1,42 @@
+# Colors
 GREEN="\033[1;32m"
+BLACK="\033[1;30m"
 RED="\033[1;31m"
 WHITE="\033[1;97m"
 CYAN="\033[1;36m"
+LIGHT_CYAN="\033[1;36m"
 STRIKE="\033[9m"
 ITALIC="\033[3m"
 FAINT="\033[2m"
+BOLD="\033[1m"
+BG="\033[41m"
 OFF="\033[m"
+
+# Style
+# Calendar
+export STYLE_CALENDAR_MONTH="$GREEN"
+export STYLE_CALENDAR_WEEKDAYS="$FAINT"
+export STYLE_CALENDAR_CURRENT_DAY="$BLACK$BG"
+export STYLE_CALENDAR_HL_DAY="$BOLD$RED"
+
+# Week view
+export STYLE_WV_DAY="$GREEN"
+export STYLE_WV_EVENT_DELIM="$RED / $OFF"
+export STYLE_WV_SUMMARY="$CYAN"
+export STYLE_WV_TIME="$WHITE"
+
+# List view
+export STYLE_LV="$FAINT"
+
+# Day view
+export STYLE_DV_ALLDAY="$LIGHT_CYAN$ITALIC$FAINT    (allday)   $OFF"
+export STYLE_DV_TIME="$LIGHT_CYAN"
+export STYLE_DV_CONFIRMED="$CYAN"
+export STYLE_DV_TENTATIVE="$FAINT$CYAN"
+export STYLE_DV_CANCELLED="$STRIKE$CYAN"
+export STYLE_DV_HOUR="$FAINT"
+export STYLE_DV_EMPTYHOUR="$FAINT----------------------$OFF"
+
+# Event preview
+export STYLE_EPV_DATETIME="$CYAN"
+export STYLE_EPV_LOCATION="$GREEN"
diff --git a/src/sh/view.sh b/src/sh/view.sh
index 85e2b22..23fc7fd 100644
--- a/src/sh/view.sh
+++ b/src/sh/view.sh
@@ -61,7 +61,18 @@ __view_day() {
       printf "%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\n" "$s" "$e" "$starttime" "$endtime" "$fpath" "$collection" "$description" "$status"
     done)
   fi
-  echo "$sef" | sort -n | awk -v today="$today" -v daystart="$DAY_START" -v dayend="$DAY_END" "$AWK_DAYVIEW"
+  echo "$sef" | sort -n | awk \
+    -v today="$today" \
+    -v daystart="$DAY_START" \
+    -v dayend="$DAY_END" \
+    -v style_allday="$STYLE_DV_ALLDAY" \
+    -v style_timerange="$STYLE_DV_TIME" \
+    -v style_confirmed="$STYLE_DV_CONFIRMED" \
+    -v style_tentative="$STYLE_DV_TENTATIVE" \
+    -v style_cancelled="$STYLE_DV_CANCELLED" \
+    -v style_hour="$STYLE_DV_HOUR" \
+    -v style_emptyhour="$STYLE_DV_EMPTYHOUR" \
+    "$AWK_DAYVIEW"
 }
 
 # This function prints the view for the week that contains the day specified in `$DISPLAY_DATE`.
@@ -127,7 +138,13 @@ __view_week() {
     echo "$sef"
     seq 0 7
   } | sort -n)
-  echo "$sef" | awk -v startofweek="$startofweek" "$AWK_WEEKVIEW"
+  echo "$sef" | awk \
+    -v startofweek="$startofweek" \
+    -v style_day="$STYLE_WV_DAY" \
+    -v style_event_delim="$STYLE_WV_EVENT_DELIM" \
+    -v style_summary="$STYLE_WV_SUMMARY" \
+    -v style_time="$STYLE_WV_TIME" \
+    "$AWK_WEEKVIEW"
 }
 
 # This function prints all entries.