made the file index work on phones

assets/about.html

@@ -48,6 +48,13 @@ footer {
 	color: #666;
 	letter-spacing: .08em;
 }
+
+@media (max-width: 600px) {
+	body {
+		padding: 12px;
+		font-size: 13px;
+	}
+}
 </style>
 </head>
 <body>

assets/index.html

@@ -139,20 +139,36 @@ footer a:hover {
 		font-size: 12px;
 	}
 }
+
+@media (max-width: 430px) {
+	body {
+		padding: 8px;
+		font-size: 12px;
+	}
+
+	td,
+	th {
+		padding: 4px;
+	}
+
+	.ty {
+		display: none;
+	}
+}
 </style>
 </head>
 <body>
 <nav class="crumbs">{{range $i, $c := .Crumbs}}{{if $i}} / {{end}}<a href="{{$c.URL}}">{{$c.Name}}</a>{{end}}</nav>
 <div class="wrap">
 <table>
-<thead><tr>{{range .Headers}}<th><a href="{{.URL}}">{{.Label}}{{if .Active}}{{if .Desc}} ▼{{else}} ▲{{end}}{{end}}</a></th>{{end}}</tr></thead>
+<thead><tr>{{range .Headers}}<th{{if .Class}} class="{{.Class}}"{{end}}><a href="{{.URL}}">{{.Label}}{{if .Active}}{{if .Desc}} ▼{{else}} ▲{{end}}{{end}}</a></th>{{end}}</tr></thead>
 <tbody>
-{{if .HasParent}}<tr><td><a href="../">../</a></td><td class="num">-</td><td class="num"></td><td class="num mod"></td></tr>{{end}}
+{{if .HasParent}}<tr><td><a href="../">../</a></td><td class="num ty">-</td><td class="num sz"></td><td class="num mod"></td></tr>{{end}}
 {{range .Rows}}
 <tr{{if .IsDir}} class="dir"{{end}}>
 <td><a href="{{.URL}}"{{if not .IsDir}} download{{end}}>{{.Name}}</a></td>
-<td class="num">{{.Type}}</td>
-<td class="num">{{if .IsDir}}-{{else}}{{.SizeS}}{{end}}</td>
+<td class="num ty">{{.Type}}</td>
+<td class="num sz">{{if .IsDir}}-{{else}}{{.SizeS}}{{end}}</td>
 <td class="num mod">{{.ModS}}</td>
 </tr>
 {{else}}<tr><td colspan="4" class="empty">empty directory</td></tr>{{end}}

server.go

@@ -61,6 +61,7 @@ func (r row) ModS() string  { return r.ModTime.Format("2006-01-02 15:04") }
 
 type headerCol struct {
 	Label  string
+	Class  string
 	URL    string
 	Active bool
 	Desc   bool
@@ -226,11 +227,18 @@ func (s *server) serveListing(w http.ResponseWriter, r *http.Request, dirPath, u
 	headers := []struct {
 		Label string
 		Key   string
-	}{{"Name", "name"}, {"Type", "type"}, {"Size", "size"}, {"Modified", "modified"}}
+		Class string
+	}{
+		{"Name", "name", ""},
+		{"Type", "type", "ty"},
+		{"Size", "size", "sz"},
+		{"Modified", "modified", "mod"},
+	}
 	cols := make([]headerCol, len(headers))
 	for i, h := range headers {
 		cols[i] = headerCol{
 			Label:  h.Label,
+			Class:  h.Class,
 			Active: h.Key == sortKey,
 			Desc:   h.Key == sortKey && desc,
 		}