Add theme color editor and multi-step undo

- New /edit/theme-settings page with native color pickers for the
  background/primary/positive/negative theme colors plus light mode,
  contrast and saturation multipliers, custom-css-file path, and
  picker-disable. Pickers use hex; the backend converts to Glance's
  HSL "H S L" form before writing. Theme presets and full custom CSS
  intentionally still YAML.
- Numbered backup chain: save() rotates up to 10 prior versions as
  glance.yml.bak.1 .. .10 instead of a single .bak. The /edit page
  lists them with humanized timestamps and a per-row Restore button.
  Single-step "Restore previous (toggle)" is preserved.
- Restoring any backup saves the just-current state as a fresh
  .bak.1, so undo-the-undo always works.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitignore

@@ -4,3 +4,4 @@
 /.idea
 /glance*.yml
 *.yml.bak
+*.yml.bak.*

internal/glance/admin-edit.go

@@ -47,8 +47,25 @@ func loadConfigEditor(path string) (*configEditor, error) {
 	return e, nil
 }
 
-// save validates the edited tree against newConfigFromYAML, writes a
+const maxBackups = 10
-// .bak of the previous file, then writes via temp+rename for atomicity.
+
+func backupPath(configPath string, n int) string {
+	return fmt.Sprintf("%s.bak.%d", configPath, n)
+}
+
+// rotateBackups shifts every .bak.N up by one (oldest gets dropped) so
+// .bak.1 becomes free to receive the just-superseded contents.
+func rotateBackups(configPath string) {
+	// Drop the oldest first.
+	os.Remove(backupPath(configPath, maxBackups))
+	for i := maxBackups - 1; i >= 1; i-- {
+		_ = os.Rename(backupPath(configPath, i), backupPath(configPath, i+1))
+	}
+}
+
+// save validates the edited tree against newConfigFromYAML, rotates the
+// numbered backup chain (up to maxBackups versions), then writes via
+// temp+rename for atomicity.
 func (e *configEditor) save() error {
 	out, err := yaml.Marshal(&e.root)
 	if err != nil {
@@ -60,7 +77,8 @@ func (e *configEditor) save() error {
 	}
 
 	if existing, err := os.ReadFile(e.path); err == nil {
-		if werr := os.WriteFile(e.path+".bak", existing, 0644); werr != nil {
+		rotateBackups(e.path)
+		if werr := os.WriteFile(backupPath(e.path, 1), existing, 0644); werr != nil {
 			log.Printf("admin: failed to write backup: %v", werr)
 		}
 	}
@@ -1015,6 +1033,152 @@ func (a *application) handleAdminWidgetSchemas(w http.ResponseWriter, r *http.Re
 	}
 }
 
+// ---------- theme settings ----------
+
+// hexToHSL converts a #rrggbb (or #rgb) string into HSL components matching
+// Glance's hslColorField format (H 0-360, S/L 0-100).
+func hexToHSL(hex string) (float64, float64, float64, error) {
+	s := strings.TrimSpace(strings.TrimPrefix(hex, "#"))
+	if len(s) == 3 {
+		s = string(s[0]) + string(s[0]) + string(s[1]) + string(s[1]) + string(s[2]) + string(s[2])
+	}
+	if len(s) != 6 {
+		return 0, 0, 0, fmt.Errorf("hex color must be #rgb or #rrggbb, got %q", hex)
+	}
+	v, err := strconv.ParseUint(s, 16, 32)
+	if err != nil {
+		return 0, 0, 0, fmt.Errorf("parsing hex %q: %w", hex, err)
+	}
+	r := float64((v>>16)&0xff) / 255.0
+	g := float64((v>>8)&0xff) / 255.0
+	b := float64(v&0xff) / 255.0
+
+	maxC, minC := r, r
+	if g > maxC {
+		maxC = g
+	}
+	if b > maxC {
+		maxC = b
+	}
+	if g < minC {
+		minC = g
+	}
+	if b < minC {
+		minC = b
+	}
+	delta := maxC - minC
+	l := (maxC + minC) / 2
+
+	var h, sat float64
+	if delta == 0 {
+		h, sat = 0, 0
+	} else {
+		if l < 0.5 {
+			sat = delta / (maxC + minC)
+		} else {
+			sat = delta / (2 - maxC - minC)
+		}
+		switch maxC {
+		case r:
+			h = (g - b) / delta
+			if g < b {
+				h += 6
+			}
+		case g:
+			h = (b-r)/delta + 2
+		case b:
+			h = (r-g)/delta + 4
+		}
+		h *= 60
+	}
+	// Round to nearest int for tidy YAML.
+	return float64(int(h + 0.5)), float64(int(sat*100 + 0.5)), float64(int(l*100 + 0.5)), nil
+}
+
+// hslToYAMLString returns the canonical Glance HSL representation: "H S L".
+func hslToYAMLString(h, s, l float64) string {
+	return fmt.Sprintf("%g %g %g", h, s, l)
+}
+
+var themeBoolKeys = map[string]bool{"light": true, "disable-picker": true}
+var themeNumberKeys = map[string]bool{"contrast-multiplier": true, "text-saturation-multiplier": true}
+var themeColorKeys = map[string]bool{"background-color": true, "primary-color": true, "positive-color": true, "negative-color": true}
+
+func (a *application) handleAdminUpdateTheme(w http.ResponseWriter, r *http.Request) {
+	if !a.adminAccessAllowed(w, r) {
+		return
+	}
+	if err := r.ParseForm(); err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	editor, err := loadConfigEditor(a.ConfigPath)
+	if err != nil {
+		adminError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	theme, err := findOrCreateKey(editor.topMapping(), "theme", true, yaml.MappingNode)
+	if err != nil {
+		adminError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+
+	fields := make(map[string]interface{})
+	// Colors: form sends hex, we store HSL.
+	for key := range themeColorKeys {
+		raw := strings.TrimSpace(r.FormValue(key))
+		if raw == "" {
+			fields[key] = nil
+			continue
+		}
+		h, s, l, err := hexToHSL(raw)
+		if err != nil {
+			adminError(w, http.StatusBadRequest, err.Error())
+			return
+		}
+		fields[key] = hslToYAMLString(h, s, l)
+	}
+	// Numbers
+	for key := range themeNumberKeys {
+		raw := strings.TrimSpace(r.FormValue(key))
+		if raw == "" {
+			fields[key] = nil
+			continue
+		}
+		f, err := strconv.ParseFloat(raw, 64)
+		if err != nil {
+			adminError(w, http.StatusBadRequest, fmt.Sprintf("%s: %v", key, err))
+			return
+		}
+		fields[key] = f
+	}
+	// Booleans (browsers omit unchecked, so default to false).
+	for key := range themeBoolKeys {
+		raw := strings.TrimSpace(r.FormValue(key))
+		fields[key] = raw == "on" || raw == "true" || raw == "1"
+	}
+	// String paths
+	if r.Form.Has("custom-css-file") {
+		raw := strings.TrimSpace(r.FormValue("custom-css-file"))
+		if raw == "" {
+			fields["custom-css-file"] = nil
+		} else {
+			fields["custom-css-file"] = raw
+		}
+	}
+
+	if err := applyFieldsToWidget(theme, fields); err != nil {
+		adminError(w, http.StatusBadRequest, err.Error())
+		return
+	}
+	if err := editor.save(); err != nil {
+		adminError(w, http.StatusBadRequest, err.Error())
+		return
+	}
+	http.Redirect(w, r, a.Config.Server.BaseURL+"/edit/theme-settings", http.StatusSeeOther)
+}
+
 // ---------- site settings (branding) ----------
 
 var brandingFieldKeys = []string{
@@ -1082,15 +1246,13 @@ func (a *application) handleAdminUpdateSiteSettings(w http.ResponseWriter, r *ht
 
 // ---------- restore from .bak ----------
 
-// handleAdminRestore swaps the contents of glance.yml and glance.yml.bak.
+// handleAdminRestore swaps the current config with .bak.1 (single-step undo).
-// Each save writes a .bak of the previous version, so this is effectively an
+// Click again to flip back. Older numbered backups stay untouched.
-// undo. Calling it again redoes since we put the just-current contents into
-// the new .bak.
 func (a *application) handleAdminRestore(w http.ResponseWriter, r *http.Request) {
 	if !a.adminAccessAllowed(w, r) {
 		return
 	}
-	bakPath := a.ConfigPath + ".bak"
+	bakPath := backupPath(a.ConfigPath, 1)
 	bakContent, err := os.ReadFile(bakPath)
 	if err != nil {
 		adminError(w, http.StatusBadRequest, "no backup to restore: "+err.Error())
@@ -1100,18 +1262,15 @@ func (a *application) handleAdminRestore(w http.ResponseWriter, r *http.Request)
 		adminError(w, http.StatusBadRequest, "backup is invalid: "+err.Error())
 		return
 	}
-
 	currentContent, err := os.ReadFile(a.ConfigPath)
 	if err != nil {
 		adminError(w, http.StatusInternalServerError, err.Error())
 		return
 	}
-	// Move current → .bak (so user can re-restore).
 	if err := os.WriteFile(bakPath, currentContent, 0644); err != nil {
 		adminError(w, http.StatusInternalServerError, "writing new backup: "+err.Error())
 		return
 	}
-	// Atomic write of .bak content into main file.
 	tmpPath := a.ConfigPath + ".tmp"
 	if err := os.WriteFile(tmpPath, bakContent, 0644); err != nil {
 		adminError(w, http.StatusInternalServerError, "writing temp file: "+err.Error())
@@ -1122,7 +1281,51 @@ func (a *application) handleAdminRestore(w http.ResponseWriter, r *http.Request)
 		adminError(w, http.StatusInternalServerError, "renaming temp file: "+err.Error())
 		return
 	}
+	http.Redirect(w, r, a.Config.Server.BaseURL+"/edit", http.StatusSeeOther)
+}
 
+// handleAdminRestoreFromBackup restores from a specific numbered backup. The
+// just-current contents are saved as a fresh .bak.1 (rotating older ones up)
+// so the user can always undo their undo.
+func (a *application) handleAdminRestoreFromBackup(w http.ResponseWriter, r *http.Request) {
+	if !a.adminAccessAllowed(w, r) {
+		return
+	}
+	n, err := strconv.Atoi(r.PathValue("n"))
+	if err != nil || n < 1 || n > maxBackups {
+		http.Error(w, "bad backup number", http.StatusBadRequest)
+		return
+	}
+
+	bakContent, err := os.ReadFile(backupPath(a.ConfigPath, n))
+	if err != nil {
+		adminError(w, http.StatusBadRequest, "backup not found: "+err.Error())
+		return
+	}
+	if _, err := newConfigFromYAML(bakContent); err != nil {
+		adminError(w, http.StatusBadRequest, "backup is invalid: "+err.Error())
+		return
+	}
+	currentContent, err := os.ReadFile(a.ConfigPath)
+	if err != nil {
+		adminError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	rotateBackups(a.ConfigPath)
+	if err := os.WriteFile(backupPath(a.ConfigPath, 1), currentContent, 0644); err != nil {
+		adminError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	tmpPath := a.ConfigPath + ".tmp"
+	if err := os.WriteFile(tmpPath, bakContent, 0644); err != nil {
+		adminError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	if err := os.Rename(tmpPath, a.ConfigPath); err != nil {
+		os.Remove(tmpPath)
+		adminError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
 	http.Redirect(w, r, a.Config.Server.BaseURL+"/edit", http.StatusSeeOther)
 }
 

internal/glance/admin.go

@@ -2,9 +2,12 @@ package glance
 
 import (
 	"bytes"
+	"fmt"
 	"html/template"
 	"net/http"
+	"os"
 	"strconv"
+	"time"
 
 	"gopkg.in/yaml.v3"
 )
@@ -14,7 +17,8 @@ var (
 	adminPageTemplate         = mustParseTemplate("admin-page.html", "document.html", "footer.html")
 	adminWidgetTemplate       = mustParseTemplate("admin-widget.html", "document.html", "footer.html")
 	adminPageSettingsTemplate = mustParseTemplate("admin-page-settings.html", "document.html", "footer.html")
-	adminSiteSettingsTemplate = mustParseTemplate("admin-site-settings.html", "document.html", "footer.html")
+	adminSiteSettingsTemplate  = mustParseTemplate("admin-site-settings.html", "document.html", "footer.html")
+	adminThemeSettingsTemplate = mustParseTemplate("admin-theme-settings.html", "document.html", "footer.html")
 )
 
 // allWidgetTypes mirrors the switch in newWidget(). Aliases ("stocks") omitted.
@@ -214,6 +218,13 @@ type adminPageSummary struct {
 	IsLast      bool
 }
 
+type adminBackupSummary struct {
+	N       int
+	Time    string // human-readable, e.g. "2 minutes ago"
+	SizeKB  int
+	Present bool
+}
+
 type adminPageDetail struct {
 	Title       string
 	Slug        string
@@ -251,7 +262,22 @@ type adminTemplateData struct {
 	IsFirstPage  bool
 	IsLastPage   bool
 
-	SiteSettings *adminSiteSettings
+	SiteSettings  *adminSiteSettings
+	ThemeSettings *adminThemeSettings
+
+	Backups []adminBackupSummary
+}
+
+type adminThemeSettings struct {
+	BackgroundColorHex       string
+	PrimaryColorHex          string
+	PositiveColorHex         string
+	NegativeColorHex         string
+	Light                    bool
+	DisablePicker            bool
+	ContrastMultiplier       float32
+	TextSaturationMultiplier float32
+	CustomCSSFile            string
 }
 
 type adminSiteSettings struct {
@@ -288,11 +314,43 @@ func (a *application) handleAdminIndex(w http.ResponseWriter, r *http.Request) {
 		})
 	}
 
-	data := adminTemplateData{App: a, Pages: summaries}
+	data := adminTemplateData{App: a, Pages: summaries, Backups: a.collectBackups()}
 	a.populateTemplateRequestData(&data.Request, r)
 	renderAdminTemplate(w, adminIndexTemplate, data)
 }
 
+func (a *application) collectBackups() []adminBackupSummary {
+	out := make([]adminBackupSummary, 0, maxBackups)
+	now := time.Now()
+	for n := 1; n <= maxBackups; n++ {
+		info, err := os.Stat(backupPath(a.ConfigPath, n))
+		if err != nil {
+			out = append(out, adminBackupSummary{N: n, Present: false})
+			continue
+		}
+		out = append(out, adminBackupSummary{
+			N:       n,
+			Time:    humanizeDuration(now.Sub(info.ModTime())) + " ago",
+			SizeKB:  int(info.Size() / 1024),
+			Present: true,
+		})
+	}
+	return out
+}
+
+func humanizeDuration(d time.Duration) string {
+	switch {
+	case d < time.Minute:
+		return fmt.Sprintf("%ds", int(d.Seconds()))
+	case d < time.Hour:
+		return fmt.Sprintf("%dm", int(d.Minutes()))
+	case d < 24*time.Hour:
+		return fmt.Sprintf("%dh", int(d.Hours()))
+	default:
+		return fmt.Sprintf("%dd", int(d.Hours()/24))
+	}
+}
+
 func (a *application) handleAdminPage(w http.ResponseWriter, r *http.Request) {
 	if !a.adminAccessAllowed(w, r) {
 		return
@@ -397,6 +455,34 @@ func (a *application) handleAdminWidget(w http.ResponseWriter, r *http.Request)
 	})
 }
 
+func hexOf(c *hslColorField) string {
+	if c == nil {
+		return ""
+	}
+	return c.ToHex()
+}
+
+func (a *application) handleAdminThemeSettings(w http.ResponseWriter, r *http.Request) {
+	if !a.adminAccessAllowed(w, r) {
+		return
+	}
+	t := a.Config.Theme
+	settings := &adminThemeSettings{
+		BackgroundColorHex:       hexOf(t.BackgroundColor),
+		PrimaryColorHex:          hexOf(t.PrimaryColor),
+		PositiveColorHex:         hexOf(t.PositiveColor),
+		NegativeColorHex:         hexOf(t.NegativeColor),
+		Light:                    t.Light,
+		DisablePicker:            t.DisablePicker,
+		ContrastMultiplier:       t.ContrastMultiplier,
+		TextSaturationMultiplier: t.TextSaturationMultiplier,
+		CustomCSSFile:            t.CustomCSSFile,
+	}
+	data := adminTemplateData{App: a, ThemeSettings: settings}
+	a.populateTemplateRequestData(&data.Request, r)
+	renderAdminTemplate(w, adminThemeSettingsTemplate, data)
+}
+
 func (a *application) handleAdminSiteSettings(w http.ResponseWriter, r *http.Request) {
 	if !a.adminAccessAllowed(w, r) {
 		return

internal/glance/glance.go

@@ -456,6 +456,7 @@ func (a *application) server() (func() error, func() error) {
 	mux.HandleFunc("GET /edit/pages/{page}", a.handleAdminPage)
 	mux.HandleFunc("GET /edit/pages/{page}/settings", a.handleAdminPageSettings)
 	mux.HandleFunc("GET /edit/site-settings", a.handleAdminSiteSettings)
+	mux.HandleFunc("GET /edit/theme-settings", a.handleAdminThemeSettings)
 	mux.HandleFunc("GET /edit/pages/{page}/widgets/{col}/{idx}", a.handleAdminWidget)
 
 	mux.HandleFunc("POST /edit/api/pages", a.handleAdminAddPage)
@@ -479,7 +480,9 @@ func (a *application) server() (func() error, func() error) {
 	mux.HandleFunc("POST /edit/api/pages/{page}/fields", a.handleAdminUpdatePageFields)
 	mux.HandleFunc("POST /edit/api/pages/{page}/move", a.handleAdminMovePage)
 	mux.HandleFunc("POST /edit/api/restore", a.handleAdminRestore)
+	mux.HandleFunc("POST /edit/api/restore/{n}", a.handleAdminRestoreFromBackup)
 	mux.HandleFunc("POST /edit/api/site-settings", a.handleAdminUpdateSiteSettings)
+	mux.HandleFunc("POST /edit/api/theme-settings", a.handleAdminUpdateTheme)
 
 	if a.RequiresAuth {
 		mux.HandleFunc("GET /login", a.handleLoginPageRequest)

internal/glance/templates/admin-theme-settings.html

@@ -0,0 +1,80 @@
+{{- template "document.html" . }}
+
+{{- define "document-title" }}Theme settings - {{ .App.Config.Branding.AppName }}{{ end }}
+
+{{- define "document-body" }}
+<div class="flex flex-column body-content">
+    <main class="content-bounds" style="padding-block: 2rem;">
+        <div class="margin-bottom-15">
+            <a class="color-subdue" href="{{ .App.Config.Server.BaseURL }}/edit">← Edit</a>
+        </div>
+        <h1 class="size-h1 margin-bottom-15">Theme</h1>
+        <p class="color-subdue margin-bottom-25">
+            Colors are stored as HSL in the YAML, but the picker below shows hex
+            for convenience — Glance converts on save. Theme presets and custom CSS
+            beyond the file path still need YAML.
+        </p>
+
+        <form method="post" action="{{ .App.Config.Server.BaseURL }}/edit/api/theme-settings"
+              style="display:flex;flex-direction:column;gap:1rem;max-width:36rem;">
+
+            <fieldset style="border:1px solid var(--color-widget-content-border);border-radius:4px;padding:1rem;">
+                <legend class="color-subdue size-h5">Colors</legend>
+                <div style="display:grid;grid-template-columns:1fr auto;gap:0.75rem;align-items:center;">
+                    <label for="bg">Background</label>
+                    <input id="bg" type="color" name="background-color" value="{{ if .ThemeSettings.BackgroundColorHex }}{{ .ThemeSettings.BackgroundColorHex }}{{ else }}#151823{{ end }}">
+
+                    <label for="pc">Primary (accent)</label>
+                    <input id="pc" type="color" name="primary-color" value="{{ if .ThemeSettings.PrimaryColorHex }}{{ .ThemeSettings.PrimaryColorHex }}{{ else }}#e4cf8d{{ end }}">
+
+                    <label for="ps">Positive</label>
+                    <input id="ps" type="color" name="positive-color" value="{{ if .ThemeSettings.PositiveColorHex }}{{ .ThemeSettings.PositiveColorHex }}{{ else }}#7fbf7f{{ end }}">
+
+                    <label for="ng">Negative</label>
+                    <input id="ng" type="color" name="negative-color" value="{{ if .ThemeSettings.NegativeColorHex }}{{ .ThemeSettings.NegativeColorHex }}{{ else }}#e07f7f{{ end }}">
+                </div>
+            </fieldset>
+
+            <fieldset style="border:1px solid var(--color-widget-content-border);border-radius:4px;padding:1rem;">
+                <legend class="color-subdue size-h5">Tweaks</legend>
+
+                <label class="form-label widget-header" style="display:flex;flex-direction:row;align-items:center;gap:0.5rem;margin-bottom:0.75rem;">
+                    <input type="checkbox" name="light" {{ if .ThemeSettings.Light }}checked{{ end }}>
+                    <span>Light mode (use light text/background scheme)</span>
+                </label>
+
+                <label class="form-label widget-header" style="display:flex;flex-direction:row;align-items:center;gap:0.5rem;margin-bottom:0.75rem;">
+                    <input type="checkbox" name="disable-picker" {{ if .ThemeSettings.DisablePicker }}checked{{ end }}>
+                    <span>Hide the theme picker in the header</span>
+                </label>
+
+                <label class="form-label widget-header">
+                    Contrast multiplier
+                    <input type="number" step="0.05" min="0.5" max="2.0" name="contrast-multiplier" class="input"
+                           value="{{ if .ThemeSettings.ContrastMultiplier }}{{ .ThemeSettings.ContrastMultiplier }}{{ end }}" placeholder="1.0">
+                    <small class="color-subdue size-h5">Higher = stronger contrast for body text. Default 1.0.</small>
+                </label>
+
+                <label class="form-label widget-header" style="margin-top:0.75rem;">
+                    Text saturation multiplier
+                    <input type="number" step="0.05" min="0" max="2.0" name="text-saturation-multiplier" class="input"
+                           value="{{ if .ThemeSettings.TextSaturationMultiplier }}{{ .ThemeSettings.TextSaturationMultiplier }}{{ end }}" placeholder="1.0">
+                    <small class="color-subdue size-h5">0 = monochrome text. Default 1.0.</small>
+                </label>
+            </fieldset>
+
+            <label class="form-label widget-header">
+                Custom CSS file
+                <input type="text" name="custom-css-file" class="input" value="{{ .ThemeSettings.CustomCSSFile }}" placeholder="/assets/custom.css">
+                <small class="color-subdue size-h5">Path to a .css file under your assets-path, loaded after the bundled styles.</small>
+            </label>
+
+            <div class="flex gap-10 margin-top-10">
+                <button type="submit">Save</button>
+                <a class="color-subdue" style="align-self:center;" href="{{ .App.Config.Server.BaseURL }}/edit">Cancel</a>
+            </div>
+        </form>
+    </main>
+    {{ template "footer.html" . }}
+</div>
+{{- end }}

internal/glance/templates/admin.html

@@ -7,6 +7,9 @@
     <main class="content-bounds" style="padding-block: 2rem;">
         <div class="flex items-center gap-10">
             <h1 class="size-h1 grow">Edit</h1>
+            <a href="{{ .App.Config.Server.BaseURL }}/edit/theme-settings">
+                <button type="button">Theme</button>
+            </a>
             <a href="{{ .App.Config.Server.BaseURL }}/edit/site-settings">
                 <button type="button">Site settings</button>
             </a>
@@ -50,15 +53,33 @@
         </form>
 
         <hr style="margin-block: 2rem; border: none; border-top: 1px solid var(--color-widget-content-border);">
-        <h3 class="size-h3 margin-bottom-10">Undo last save</h3>
+        <h3 class="size-h3 margin-bottom-10">Saved versions</h3>
         <p class="color-subdue margin-bottom-10">
-            Restores the previous contents of <code>{{ .App.ConfigPath }}</code> from the
+            Up to {{ len .Backups }} previous versions of <code>{{ .App.ConfigPath }}</code> are kept.
-            <code>.bak</code> file written on each save. Click again to redo.
+            Restoring any one writes it as the current config and saves the just-current state as the new <em>most recent</em>, so you can always step back.
         </p>
+
         <form method="post" action="{{ .App.Config.Server.BaseURL }}/edit/api/restore"
-              onsubmit="return confirm('Restore the previous version of your config?');">
+              onsubmit="return confirm('Restore the most recent backup? You can click again to flip back.');" class="margin-bottom-15">
-            <button type="submit">Restore previous version</button>
+            <button type="submit">Restore previous version (toggle)</button>
         </form>
+
+        <ul class="list list-gap-10">
+            {{- range .Backups }}
+            {{- if .Present }}
+            <li class="flex items-center gap-10">
+                <div class="grow">
+                    <span class="color-text-base">Version {{ .N }}</span>
+                    <span class="color-subdue size-h5"> — {{ .Time }} · {{ .SizeKB }} KB</span>
+                </div>
+                <form method="post" action="{{ $.App.Config.Server.BaseURL }}/edit/api/restore/{{ .N }}"
+                      onsubmit="return confirm('Restore this version? Current state will be saved as the new most recent backup.');">
+                    <button type="submit">Restore this</button>
+                </form>
+            </li>
+            {{- end }}
+            {{- end }}
+        </ul>
     </main>
     {{ template "footer.html" . }}
 </div>