client/web: button, link, and other small UI updates

Makes the following changes:
* Use “link” class in various spots
* Remove button appearance on Exit Node dropdown in readonly mode
* Update `-stone-` colors to `-gray-` (couple spots missed by
  original color config commit)
* Pull full ui/button component from admin panel, and update
  buttons throughout UI to use this component
* Remove various buttons in readonly view to match mocks
* Add route (and “pending approval”) highlights to Subnet router
  settings card
* Delete legacy client button styles from index.css
* Fix overflow of IPv6 address on device details view

Updates #10261

Signed-off-by: Sonia Appasamy <sonia@tailscale.com>

client/web/src/components/app.tsx

@@ -153,10 +153,7 @@ function Header({
         <LoginToggle node={node} auth={auth} newSession={newSession} />
       </div>
       {loc !== "/" && loc !== "/update" && (
-        <Link
-          to="/"
-          className="text-blue-500 font-medium leading-snug block mb-[10px]"
-        >
+        <Link to="/" className="link font-medium block mb-[10px]">
           &larr; Back to {node.DeviceName}
         </Link>
       )}

client/web/src/components/exit-node-selector.tsx

@@ -85,10 +85,12 @@ export default function ExitNodeSelector({
       >
         <button
           className={cx("flex-1 px-2 py-1.5 rounded-[1px]", {
-            "bg-white hover:bg-stone-100": none,
-            "bg-amber-600 hover:bg-orange-400": advertising,
-            "bg-blue-500 hover:bg-blue-400": using,
-            "cursor-not-allowed": disabled,
+            "bg-white": none,
+            "hover:bg-gray-100": none && !disabled,
+            "bg-orange-600": advertising,
+            "hover:bg-orange-400": advertising && !disabled,
+            "bg-blue-500": using,
+            "hover:bg-blue-400": using && !disabled,
           })}
           onClick={() => setOpen(!open)}
           disabled={disabled}
@@ -116,27 +118,27 @@ export default function ExitNodeSelector({
                 ? "Running as exit node"
                 : selected.Name}
             </p>
+            {!disabled && (
               <ChevronDown
                 className={cx("ml-1", {
-                "stroke-neutral-800": none,
+                  "stroke-gray-800": none,
                   "stroke-white": advertising || using,
                 })}
               />
+            )}
           </div>
         </button>
-        {(advertising || using) && (
+        {!disabled && (advertising || using) && (
           <button
             className={cx("px-3 py-2 rounded-sm text-white", {
               "bg-orange-400": advertising,
               "bg-blue-400": using,
-              "cursor-not-allowed": disabled,
             })}
             onClick={(e) => {
               e.preventDefault()
               e.stopPropagation()
               handleSelect(noExitNode)
             }}
-            disabled={disabled}
           >
             Disable
           </button>
@@ -252,7 +254,7 @@ function ExitNodeSelectorItem({
   return (
     <button
       key={node.ID}
-      className="w-full px-4 py-2 flex justify-between items-center cursor-pointer hover:bg-stone-100"
+      className="w-full px-4 py-2 flex justify-between items-center cursor-pointer hover:bg-gray-100"
       onClick={onSelect}
     >
       <div>

client/web/src/components/login-toggle.tsx

@@ -230,9 +230,11 @@ function SignInButton({
 }) {
   return (
     <Button
-      className={cx("w-full text-sm mt-2", {
+      className={cx("text-center w-full mt-2", {
         "mb-2": auth.viewerIdentity,
       })}
+      intent="primary"
+      sizeVariant="small"
       onClick={onClick}
     >
       {auth.viewerIdentity ? "Sign in to confirm identity" : "Sign in"}

client/web/src/components/update-available.tsx

@@ -3,13 +3,16 @@
 
 import React from "react"
 import { VersionInfo } from "src/hooks/self-update"
-import { Link } from "wouter"
+import Button from "src/ui/button"
+import { useLocation } from "wouter"
 
 export function UpdateAvailableNotification({
   details,
 }: {
   details: VersionInfo
 }) {
+  const [, setLocation] = useLocation()
+
   return (
     <div className="card">
       <h2 className="mb-2">
@@ -22,12 +25,13 @@ export function UpdateAvailableNotification({
           : "A new update"}{" "}
         is now available. <ChangelogText version={details.LatestVersion} />
       </p>
-      <Link
-        className="button button-blue mt-3 text-sm inline-block"
-        to="/update"
+      <Button
+        className="mt-3 inline-block"
+        sizeVariant="small"
+        onClick={() => setLocation("/update")}
       >
         Update now
-      </Link>
+      </Button>
     </div>
   )
 }

client/web/src/components/views/device-details-view.tsx

@@ -8,6 +8,7 @@ import ACLTag from "src/components/acl-tag"
 import * as Control from "src/components/control-components"
 import { UpdateAvailableNotification } from "src/components/update-available"
 import { NodeData } from "src/hooks/node-data"
+import Button from "src/ui/button"
 import { useLocation } from "wouter"
 
 export default function DeviceDetailsView({
@@ -34,20 +35,18 @@ export default function DeviceDetailsView({
                 })}
               />
             </div>
-            <button
-              className={cx(
-                "px-3 py-2 bg-stone-50 rounded shadow border border-stone-200 text-gray-800 text-sm font-medium",
-                { "cursor-not-allowed": readonly }
-              )}
+            {!readonly && (
+              <Button
+                sizeVariant="small"
                 onClick={() =>
                   apiFetch("/local/v0/logout", "POST")
                     .then(() => setLocation("/"))
                     .catch((err) => alert("Logout failed: " + err.message))
                 }
-              disabled={readonly}
               >
                 Disconnect…
-            </button>
+              </Button>
+            )}
           </div>
         </div>
         {node.Features["auto-update"] &&

client/web/src/components/views/home-view.tsx

@@ -2,12 +2,13 @@
 // SPDX-License-Identifier: BSD-3-Clause
 
 import cx from "classnames"
-import React from "react"
+import React, { useMemo } from "react"
 import { ReactComponent as ArrowRight } from "src/assets/icons/arrow-right.svg"
 import { ReactComponent as ConnectedDeviceIcon } from "src/assets/icons/connected-device.svg"
 import ExitNodeSelector from "src/components/exit-node-selector"
 import { NodeData, NodeUpdaters } from "src/hooks/node-data"
-import { Link } from "wouter"
+import { pluralize } from "src/util"
+import { Link, useLocation } from "wouter"
 
 export default function HomeView({
   readonly,
@@ -18,6 +19,14 @@ export default function HomeView({
   node: NodeData
   nodeUpdaters: NodeUpdaters
 }) {
+  const [allSubnetRoutes, pendingSubnetRoutes] = useMemo(
+    () => [
+      node.AdvertisedRoutes?.length,
+      node.AdvertisedRoutes?.filter((r) => !r.Approved).length,
+    ],
+    [node.AdvertisedRoutes]
+  )
+
   return (
     <div className="mb-12 w-full">
       <h2 className="mb-3">This device</h2>
@@ -42,30 +51,51 @@ export default function HomeView({
             disabled={readonly}
           />
         )}
-        <Link className="text-blue-500 font-medium leading-snug" to="/details">
+        <Link className="link font-medium" to="/details">
           View device details &rarr;
         </Link>
       </div>
       <h2 className="mb-3">Settings</h2>
+      <div className="grid gap-3">
         {node.Features["advertise-routes"] && (
           <SettingsCard
             link="/subnets"
-          className="mb-3"
             title="Subnet router"
             body="Add devices to your tailnet without installing Tailscale on them."
+            badge={
+              allSubnetRoutes
+                ? {
+                    text: `${allSubnetRoutes} ${pluralize(
+                      "route",
+                      "routes",
+                      allSubnetRoutes
+                    )}`,
+                  }
+                : undefined
+            }
+            footer={
+              pendingSubnetRoutes
+                ? `${pendingSubnetRoutes} ${pluralize(
+                    "route",
+                    "routes",
+                    pendingSubnetRoutes
+                  )} pending approval`
+                : undefined
+            }
           />
         )}
         {node.Features["ssh"] && (
           <SettingsCard
             link="/ssh"
-          className="mb-3"
             title="Tailscale SSH server"
             body="Run a Tailscale SSH server on this device and allow other devices in your tailnet to SSH into it."
             badge={
               node.RunningSSHServer
                 ? {
                     text: "Running",
-                  icon: <div className="w-2 h-2 bg-emerald-500 rounded-full" />,
+                    icon: (
+                      <div className="w-2 h-2 bg-emerald-500 rounded-full" />
+                    ),
                   }
                 : undefined
             }
@@ -78,6 +108,7 @@ export default function HomeView({
         body="Share local ports, services, and content to your Tailscale network or to the broader internet."
       /> */}
       </div>
+    </div>
   )
 }
 
@@ -86,6 +117,7 @@ function SettingsCard({
   link,
   body,
   badge,
+  footer,
   className,
 }: {
   title: string
@@ -95,23 +127,24 @@ function SettingsCard({
     text: string
     icon?: JSX.Element
   }
+  footer?: string
   className?: string
 }) {
+  const [, setLocation] = useLocation()
+
   return (
-    <Link
-      to={link}
-      className={cx(
-        "-mx-5 card flex justify-between items-center cursor-pointer",
-        className
-      )}
+    <button
+      className={cx("-mx-5 card cursor-pointer", className)}
+      onClick={() => setLocation(link)}
     >
+      <div className="flex justify-between items-center">
         <div>
           <div className="flex gap-2">
             <p className="text-gray-800 font-medium leading-tight mb-2">
               {title}
             </p>
             {badge && (
-            <div className="h-5 px-2 bg-stone-100 rounded-full flex items-center gap-2">
+              <div className="h-5 px-2 bg-gray-100 rounded-full flex items-center gap-2">
                 {badge.icon}
                 <div className="text-gray-500 text-xs font-medium">
                   {badge.text}
@@ -124,6 +157,13 @@ function SettingsCard({
         <div>
           <ArrowRight className="ml-3" />
         </div>
-    </Link>
+      </div>
+      {footer && (
+        <>
+          <hr className="my-3" />
+          <div className="text-gray-500 text-sm leading-tight">{footer}</div>
+        </>
+      )}
+    </button>
   )
 }

client/web/src/components/views/login-view.tsx

@@ -5,6 +5,7 @@ import React, { useCallback, useState } from "react"
 import { apiFetch } from "src/api"
 import { ReactComponent as TailscaleIcon } from "src/assets/icons/tailscale-icon.svg"
 import { NodeData } from "src/hooks/node-data"
+import Button from "src/ui/button"
 import Collapsible from "src/ui/collapsible"
 import Input from "src/ui/input"
 
@@ -40,12 +41,13 @@ export default function LoginView({
               Your device is disconnected from Tailscale.
             </p>
           </div>
-          <button
+          <Button
             onClick={() => login({})}
-            className="button button-blue w-full mb-4"
+            className="w-full mb-4"
+            intent="primary"
           >
             Connect to Tailscale
-          </button>
+          </Button>
         </>
       ) : data.IP ? (
         <>
@@ -64,12 +66,13 @@ export default function LoginView({
               .
             </p>
           </div>
-          <button
+          <Button
             onClick={() => login({ Reauthenticate: true })}
-            className="button button-blue w-full mb-4"
+            className="w-full mb-4"
+            intent="primary"
           >
             Reauthenticate
-          </button>
+          </Button>
         </>
       ) : (
         <>
@@ -89,7 +92,7 @@ export default function LoginView({
               .
             </p>
           </div>
-          <button
+          <Button
             onClick={() =>
               login({
                 Reauthenticate: true,
@@ -97,10 +100,11 @@ export default function LoginView({
                 AuthKey: authKey,
               })
             }
-            className="button button-blue w-full mb-4"
+            className="w-full mb-4"
+            intent="primary"
           >
             Log In
-          </button>
+          </Button>
           <Collapsible trigger="Advanced options">
             <h4 className="font-medium mb-1 mt-2">Auth Key</h4>
             <p className="text-sm text-gray-500">

client/web/src/components/views/subnet-router-view.tsx

@@ -19,10 +19,11 @@ export default function SubnetRouterView({
   node: NodeData
   nodeUpdaters: NodeUpdaters
 }) {
-  const advertisedRoutes = useMemo(
-    () => node.AdvertisedRoutes || [],
-    [node.AdvertisedRoutes]
-  )
+  const [advertisedRoutes, hasUnapprovedRoutes] = useMemo(() => {
+    const routes = node.AdvertisedRoutes || []
+    return [routes, routes.find((r) => !r.Approved)]
+  }, [node.AdvertisedRoutes])
+
   const [inputOpen, setInputOpen] = useState<boolean>(
     advertisedRoutes.length === 0 && !readonly
   )
@@ -42,9 +43,12 @@ export default function SubnetRouterView({
           Learn more &rarr;
         </a>
       </p>
-      {inputOpen ? (
+      {!readonly &&
+        (inputOpen ? (
           <div className="-mx-5 card shadow">
-          <p className="font-medium leading-snug mb-3">Advertise new routes</p>
+            <p className="font-medium leading-snug mb-3">
+              Advertise new routes
+            </p>
             <Input
               type="text"
               className="text-sm"
@@ -56,6 +60,7 @@ export default function SubnetRouterView({
               Add multiple routes by providing a comma-separated list.
             </p>
             <Button
+              intent="primary"
               onClick={() =>
                 nodeUpdaters
                   .postSubnetRoutes([
@@ -67,17 +72,20 @@ export default function SubnetRouterView({
                     setInputOpen(false)
                   })
               }
-            disabled={readonly || !inputText}
+              disabled={!inputText}
             >
               Advertise routes
             </Button>
           </div>
         ) : (
-        <Button onClick={() => setInputOpen(true)} disabled={readonly}>
-          <Plus />
+          <Button
+            intent="primary"
+            prefixIcon={<Plus />}
+            onClick={() => setInputOpen(true)}
+          >
             Advertise new route
           </Button>
-      )}
+        ))}
       <div className="-mx-5 mt-10">
         {advertisedRoutes.length > 0 ? (
           <>
@@ -96,7 +104,7 @@ export default function SubnetRouterView({
                         <Clock className="w-4 h-4" />
                       )}
                       {r.Approved ? (
-                        <div className="text-emerald-800 text-sm leading-tight">
+                        <div className="text-green-500 text-sm leading-tight">
                           Approved
                         </div>
                       ) : (
@@ -105,9 +113,9 @@ export default function SubnetRouterView({
                         </div>
                       )}
                     </div>
+                    {!readonly && (
                       <Button
-                      intent="secondary"
-                      className="text-sm font-medium"
+                        sizeVariant="small"
                         onClick={() =>
                           nodeUpdaters.postSubnetRoutes(
                             advertisedRoutes
@@ -115,14 +123,15 @@ export default function SubnetRouterView({
                               .filter((it) => it !== r.Route)
                           )
                         }
-                      disabled={readonly}
                       >
                         Stop advertising…
                       </Button>
+                    )}
                   </div>
                 </div>
               ))}
             </div>
+            {hasUnapprovedRoutes && (
               <Control.AdminContainer
                 className="mt-3 w-full text-center text-gray-500 text-sm leading-tight"
                 node={node}
@@ -133,9 +142,10 @@ export default function SubnetRouterView({
                 </Control.AdminLink>
                 .
               </Control.AdminContainer>
+            )}
           </>
         ) : (
-          <div className="px-5 py-4 bg-stone-50 rounded-lg border border-gray-200 text-center text-gray-500">
+          <div className="px-5 py-4 bg-gray-50 rounded-lg border border-gray-200 text-center text-gray-500">
             Not advertising any routes
           </div>
         )}

client/web/src/components/views/updating-view.tsx

@@ -10,8 +10,9 @@ import {
   useInstallUpdate,
   VersionInfo,
 } from "src/hooks/self-update"
+import Button from "src/ui/button"
 import Spinner from "src/ui/spinner"
-import { Link } from "wouter"
+import { useLocation } from "wouter"
 
 /**
  * UpdatingView is rendered when the user initiates a Tailscale update, and
@@ -24,6 +25,7 @@ export function UpdatingView({
   versionInfo?: VersionInfo
   currentVersion: string
 }) {
+  const [, setLocation] = useLocation()
   const { updateState, updateLog } = useInstallUpdate(
     currentVersion,
     versionInfo
@@ -51,9 +53,13 @@ export function UpdatingView({
                 : null}
               . <ChangelogText version={versionInfo?.LatestVersion} />
             </p>
-            <Link className="button button-blue text-sm m-3" to="/">
+            <Button
+              className="m-3"
+              sizeVariant="small"
+              onClick={() => setLocation("/")}
+            >
               Log in to access
-            </Link>
+            </Button>
           </>
         ) : updateState === UpdateState.UpToDate ? (
           <>
@@ -63,9 +69,13 @@ export function UpdatingView({
               You are already running Tailscale {currentVersion}, which is the
               newest version available.
             </p>
-            <Link className="button button-blue text-sm m-3" to="/">
+            <Button
+              className="m-3"
+              sizeVariant="small"
+              onClick={() => setLocation("/")}
+            >
               Return
-            </Link>
+            </Button>
           </>
         ) : (
           /* TODO(naman,sonia): Figure out the body copy and design for this view. */
@@ -79,9 +89,13 @@ export function UpdatingView({
                 : null}{" "}
               failed.
             </p>
-            <Link className="button button-blue text-sm m-3" to="/">
+            <Button
+              className="m-3"
+              sizeVariant="small"
+              onClick={() => setLocation("/")}
+            >
               Return
-            </Link>
+            </Button>
           </>
         )}
         <pre className="h-64 overflow-scroll m-3">

client/web/src/index.css

@@ -175,14 +175,20 @@
   .card h2 {
     @apply text-gray-500 text-xs font-semibold uppercase tracking-wide;
   }
+  .card table {
+    @apply w-full;
+  }
   .card tbody {
     @apply flex flex-col gap-2;
   }
+  .card tr {
+    @apply grid grid-flow-col grid-cols-3 gap-2;
+  }
   .card td:first-child {
-    @apply w-40 text-gray-500 text-sm leading-tight flex-shrink-0;
+    @apply text-gray-500 text-sm leading-tight truncate;
   }
   .card td:last-child {
-    @apply text-gray-800 text-sm leading-tight;
+    @apply col-span-2 text-gray-800 text-sm leading-tight truncate;
   }
 
   .description {
@@ -286,6 +292,39 @@
     @apply w-[0.675rem] translate-x-[0.55rem];
   }
 
+  /**
+   * .button encapsulates all the base button styles we use across the app.
+   */
+
+  .button {
+    @apply relative inline-flex flex-nowrap items-center justify-center font-medium py-2 px-4 rounded-md border border-transparent text-center whitespace-nowrap;
+    transition-property: background-color, border-color, color, box-shadow;
+    transition-duration: 120ms;
+    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.04);
+  }
+  .button:focus-visible {
+    @apply outline-none ring;
+  }
+  .button:disabled {
+    @apply pointer-events-none select-none;
+  }
+
+  .button-group {
+    @apply whitespace-nowrap;
+  }
+
+  .button-group .button {
+    @apply min-w-[60px];
+  }
+
+  .button-group .button:not(:first-child) {
+    @apply rounded-l-none;
+  }
+
+  .button-group .button:not(:last-child) {
+    @apply rounded-r-none border-r-0;
+  }
+
   /**
    * .input defines default text input field styling. These styles should
    * correspond to .button, sharing a similar height and rounding, since .input
@@ -321,157 +360,108 @@
   .input-error {
     @apply border-red-200;
   }
-}
 
-@layer utilities {
-  .h-input {
-    @apply h-[2.375rem];
-  }
-}
-
-/**
- * Non-Tailwind styles begin here.
+  /**
+   * .loading-dots creates a set of three dots that pulse for indicating loading
+   * states where a more horizontal appearance is helpful.
    */
 
-.bg-gray-0 {
-  --tw-bg-opacity: 1;
-  background-color: rgba(250, 249, 248, var(--tw-bg-opacity));
-}
-
-.bg-gray-50 {
-  --tw-bg-opacity: 1;
-  background-color: rgba(249, 247, 246, var(--tw-bg-opacity));
-}
-
-html {
-  letter-spacing: -0.015em;
-  text-rendering: optimizeLegibility;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-}
-
-.link {
-  --text-opacity: 1;
-  color: #4b70cc;
-  color: rgba(75, 112, 204, var(--text-opacity));
-}
-
-.link:hover,
-.link:active {
-  --text-opacity: 1;
-  color: #19224a;
-  color: rgba(25, 34, 74, var(--text-opacity));
-}
-
-.link-underline {
-  text-decoration: underline;
-}
-
-.link-underline:hover,
-.link-underline:active {
-  text-decoration: none;
-}
-
-.link-muted {
-  /* same as text-gray-500 */
-  --tw-text-opacity: 1;
-  color: rgba(112, 110, 109, var(--tw-text-opacity));
-}
-
-.link-muted:hover,
-.link-muted:active {
-  /* same as text-gray-500 */
-  --tw-text-opacity: 1;
-  color: rgba(68, 67, 66, var(--tw-text-opacity));
-}
-
-.button {
-  font-weight: 500;
-  padding-top: 0.45rem;
-  padding-bottom: 0.45rem;
-  padding-left: 1rem;
-  padding-right: 1rem;
-  border-radius: 0.375rem;
-  border-width: 1px;
-  border-color: transparent;
-  transition-property: background-color, border-color, color, box-shadow;
-  transition-duration: 120ms;
-  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.04);
-  min-width: 80px;
-}
-
-.button:focus {
-  outline: 0;
-  box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.5);
-}
-
-.button:disabled {
-  cursor: not-allowed;
-  -webkit-user-select: none;
-  -ms-user-select: none;
-  user-select: none;
-}
-
-.button-blue {
-  --bg-opacity: 1;
-  background-color: #4b70cc;
-  background-color: rgba(75, 112, 204, var(--bg-opacity));
-  --border-opacity: 1;
-  border-color: #4b70cc;
-  border-color: rgba(75, 112, 204, var(--border-opacity));
-  --text-opacity: 1;
-  color: #fff;
-  color: rgba(255, 255, 255, var(--text-opacity));
-}
+  .loading-dots {
+    @apply inline-flex items-center;
+  }
 
-.button-blue:enabled:hover {
-  --bg-opacity: 1;
-  background-color: #3f5db3;
-  background-color: rgba(63, 93, 179, var(--bg-opacity));
-  --border-opacity: 1;
-  border-color: #3f5db3;
-  border-color: rgba(63, 93, 179, var(--border-opacity));
-}
+  .loading-dots span {
+    @apply inline-block w-[0.35rem] h-[0.35rem] rounded-full bg-current mx-[0.15em];
+    animation-name: loading-dots-blink;
+    animation-duration: 1.4s;
+    animation-iteration-count: infinite;
+    animation-fill-mode: both;
+  }
 
-.button-blue:disabled {
-  --text-opacity: 1;
-  color: #cedefd;
-  color: rgba(206, 222, 253, var(--text-opacity));
-  --bg-opacity: 1;
-  background-color: #6c94ec;
-  background-color: rgba(108, 148, 236, var(--bg-opacity));
-  --border-opacity: 1;
-  border-color: #6c94ec;
-  border-color: rgba(108, 148, 236, var(--border-opacity));
-}
+  .loading-dots span:nth-child(2) {
+    animation-delay: 200ms;
+  }
 
-.button-red {
-  background-color: #d04841;
-  border-color: #d04841;
-  color: #fff;
-}
+  .loading-dots span:nth-child(3) {
+    animation-delay: 400ms;
+  }
 
-.button-red:enabled:hover {
-  background-color: #b22d30;
-  border-color: #b22d30;
-}
+  @keyframes loading-dots-blink {
+    0% {
+      opacity: 0.2;
+    }
+    20% {
+      opacity: 1;
+    }
+    100% {
+      opacity: 0.2;
+    }
+  }
 
-/**
+  /**
   * .spinner creates a circular animated spinner, most often used to indicate a
   * loading state. The .spinner element must define a width, height, and
   * border-width for the spinner to apply.
   */
 
-@keyframes spin {
+  @keyframes spin {
     0% {
       transform: rotate(0deg);
     }
     100% {
       transform: rotate(360deg);
     }
-}
+  }
 
-.spinner {
+  .spinner {
     @apply border-transparent border-t-current border-l-current rounded-full;
     animation: spin 700ms linear infinite;
+  }
+
+  /**
+   * .link applies standard styling to links across the app. By default we unstyle
+   * all anchor tags. While this might sound crazy for a website, it's _very_
+   * helpful in an app, since anchor tags can be used to wrap buttons, icons,
+   * and all manner of UI component. As a result, all anchor tags intended to look
+   * like links should have a .link class.
+   */
+
+  .link {
+    @apply text-text-primary;
+  }
+
+  .link:hover,
+  .link:active {
+    @apply text-blue-700;
+  }
+
+  .link-destructive {
+    @apply text-text-danger;
+  }
+
+  .link-destructive:hover,
+  .link-destructive:active {
+    @apply text-red-700;
+  }
+
+  .link-fade {
+  }
+
+  .link-fade:hover {
+    @apply opacity-75;
+  }
+
+  .link-underline {
+    @apply underline;
+  }
+
+  .link-underline:hover {
+    @apply opacity-75;
+  }
+}
+
+@layer utilities {
+  .h-input {
+    @apply h-[2.375rem];
+  }
 }

client/web/src/ui/button.tsx

@@ -2,32 +2,148 @@
 // SPDX-License-Identifier: BSD-3-Clause
 
 import cx from "classnames"
-import React, { ButtonHTMLAttributes } from "react"
+import React, { HTMLProps } from "react"
+import LoadingDots from "src/ui/loading-dots"
 
 type Props = {
-  intent?: "primary" | "secondary"
-} & ButtonHTMLAttributes<HTMLButtonElement>
+  type?: "button" | "submit" | "reset"
+  sizeVariant?: "input" | "small" | "medium" | "large"
+  /**
+   * variant is the visual style of the button. By default, this is a filled
+   * button. For a less prominent button, use minimal.
+   */
+  variant?: Variant
+  /**
+   * intent describes the semantic meaning of the button's action. For
+   * dangerous or destructive actions, use danger. For actions that should
+   * be the primary focus, use primary.
+   */
+  intent?: Intent
 
-export default function Button(props: Props) {
-  const { intent = "primary", className, disabled, children, ...rest } = props
+  active?: boolean
+  /**
+   * prefixIcon is an icon or piece of content shown at the start of a button.
+   */
+  prefixIcon?: React.ReactNode
+  /**
+   * suffixIcon is an icon or piece of content shown at the end of a button.
+   */
+  suffixIcon?: React.ReactNode
+  /**
+   * loading displays a loading indicator inside the button when set to true.
+   * The sizing of the button is not affected by this prop.
+   */
+  loading?: boolean
+  /**
+   * iconOnly indicates that the button contains only an icon. This is used to
+   * adjust styles to be appropriate for an icon-only button.
+   */
+  iconOnly?: boolean
+  /**
+   * textAlign align the text center or left. If left aligned, any icons will
+   * move to the sides of the button.
+   */
+  textAlign?: "center" | "left"
+} & HTMLProps<HTMLButtonElement>
+
+export type Variant = "filled" | "minimal"
+export type Intent = "base" | "primary" | "warning" | "danger" | "black"
+
+const Button = React.forwardRef<HTMLButtonElement, Props>((props, ref) => {
+  const {
+    className,
+    variant = "filled",
+    intent = "base",
+    sizeVariant = "large",
+    disabled,
+    children,
+    loading,
+    active,
+    iconOnly,
+    prefixIcon,
+    suffixIcon,
+    textAlign,
+    ...rest
+  } = props
+
+  const hasIcon = Boolean(prefixIcon || suffixIcon)
 
   return (
     <button
       className={cx(
-        "px-3 py-2 rounded shadow justify-center items-center gap-2.5 inline-flex font-medium",
+        "button",
         {
-          "bg-blue-500 text-white": intent === "primary" && !disabled,
-          "bg-blue-400 text-blue-200": intent === "primary" && disabled,
-          "bg-stone-50 shadow border border-stone-200 text-gray-800":
-            intent === "secondary",
-          "cursor-not-allowed": disabled,
+          // base filled
+          "bg-gray-0 border-gray-300 enabled:hover:bg-gray-100 enabled:hover:border-gray-300 enabled:hover:text-gray-900 disabled:border-gray-200 disabled:text-gray-400":
+            intent === "base" && variant === "filled",
+          "enabled:bg-gray-200 enabled:border-gray-300":
+            intent === "base" && variant === "filled" && active,
+          // primary filled
+          "bg-blue-500 border-blue-500 text-white enabled:hover:bg-blue-600 enabled:hover:border-blue-600 disabled:text-blue-50 disabled:bg-blue-300 disabled:border-blue-300":
+            intent === "primary" && variant === "filled",
+          // danger filled
+          "bg-red-400 border-red-400 text-white enabled:hover:bg-red-500 enabled:hover:border-red-500 disabled:text-red-50 disabled:bg-red-300 disabled:border-red-300":
+            intent === "danger" && variant === "filled",
+          // warning filled
+          "bg-yellow-300 border-yellow-300 text-white enabled:hover:bg-yellow-400 enabled:hover:border-yellow-400 disabled:text-yellow-50 disabled:bg-yellow-200 disabled:border-yellow-200":
+            intent === "warning" && variant === "filled",
+          // black filled
+          "bg-gray-800 border-gray-800 text-white enabled:hover:bg-gray-900 enabled:hover:border-gray-900 disabled:opacity-75":
+            intent === "black" && variant === "filled",
+
+          // minimal button (base variant, black is also included because its not supported for minimal buttons)
+          "bg-transparent border-transparent shadow-none disabled:border-transparent disabled:text-gray-400":
+            variant === "minimal",
+          "text-gray-700 enabled:focus-visible:bg-gray-100 enabled:hover:bg-gray-100 enabled:hover:text-gray-800":
+            variant === "minimal" && (intent === "base" || intent === "black"),
+          "enabled:bg-gray-200 border-gray-300":
+            variant === "minimal" &&
+            (intent === "base" || intent === "black") &&
+            active,
+          // primary minimal
+          "text-blue-600 enabled:focus-visible:bg-blue-0 enabled:hover:bg-blue-0 enabled:hover:text-blue-800":
+            variant === "minimal" && intent === "primary",
+          // danger minimal
+          "text-red-600 enabled:focus-visible:bg-red-0 enabled:hover:bg-red-0 enabled:hover:text-red-800":
+            variant === "minimal" && intent === "danger",
+          // warning minimal
+          "text-yellow-600 enabled:focus-visible:bg-orange-0 enabled:hover:bg-orange-0 enabled:hover:text-orange-800":
+            variant === "minimal" && intent === "warning",
+
+          // sizeVariants
+          "px-3 py-[0.35rem]": sizeVariant === "medium",
+          "h-input": sizeVariant === "input",
+          "px-3 text-sm py-[0.35rem]": sizeVariant === "small",
+          "button-active relative z-10": active === true,
+          "px-3":
+            iconOnly && (sizeVariant === "large" || sizeVariant === "input"),
+          "px-2":
+            iconOnly && (sizeVariant === "medium" || sizeVariant === "small"),
+          "icon-parent gap-2": hasIcon,
         },
         className
       )}
+      ref={ref}
+      disabled={disabled || loading}
       {...rest}
-      disabled={disabled}
+    >
+      {prefixIcon && <span className="flex-shrink-0">{prefixIcon}</span>}
+      {loading && (
+        <LoadingDots className="absolute top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 text-current" />
+      )}
+      {children && (
+        <span
+          className={cx({
+            "text-transparent": loading === true,
+            "text-left flex-1": textAlign === "left",
+          })}
         >
           {children}
+        </span>
+      )}
+      {suffixIcon && <span className="flex-shrink-0">{suffixIcon}</span>}
     </button>
   )
-}
+})
+
+export default Button

client/web/src/ui/collapsible.tsx

@@ -24,7 +24,7 @@ export default function Collapsible(props: CollapsibleProps) {
         onOpenChange?.(open)
       }}
     >
-      <Primitive.Trigger className="inline-flex items-center text-gray-600 cursor-pointer hover:bg-stone-100 rounded text-sm font-medium pr-3 py-1 transition-colors">
+      <Primitive.Trigger className="inline-flex items-center text-gray-600 cursor-pointer hover:bg-gray-100 rounded text-sm font-medium pr-3 py-1 transition-colors">
         <span className="ml-2 mr-1.5 group-hover:text-gray-500 -rotate-90 state-open:rotate-0">
           <ChevronDown strokeWidth={3} className="stroke-gray-400 w-4" />
         </span>

client/web/src/ui/loading-dots.tsx

@@ -0,0 +1,23 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+import cx from "classnames"
+import React, { HTMLAttributes } from "react"
+
+type Props = HTMLAttributes<HTMLDivElement>
+
+/**
+ * LoadingDots provides a set of horizontal dots to indicate a loading state.
+ * These dots are helpful in horizontal contexts (like buttons) where a spinner
+ * doesn't fit as well.
+ */
+export default function LoadingDots(props: Props) {
+  const { className, ...rest } = props
+  return (
+    <div className={cx(className, "loading-dots")} {...rest}>
+      <span />
+      <span />
+      <span />
+    </div>
+  )
+}

client/web/src/util.ts

@@ -8,3 +8,14 @@
 export function assertNever(a: never): never {
   return a
 }
+
+/**
+ * pluralize is a very simple function that returns either
+ * the singular or plural form of a string based on the given
+ * quantity.
+ *
+ * TODO: Ideally this would use a localized pluralization.
+ */
+export function pluralize(signular: string, plural: string, qty: number) {
+  return qty === 1 ? signular : plural
+}