Add new first-time tutorial (#9531)

* Prepare to load onboarding as a full page

* Update the first-time introduction

* Improve responsive design

* Replace speech bubble with logo

* Increase text size and reword first paragraph

3 files changed, 154 insertions, 239 deletions

diff --git a/app/javascript/styles/application.scss b/app/javascript/styles/application.scss
index 0990a4f25..4bce74187 100644
--- a/app/javascript/styles/application.scss
+++ b/app/javascript/styles/application.scss
@@ -16,6 +16,7 @@
 @import 'mastodon/stream_entries';
 @import 'mastodon/boost';
 @import 'mastodon/components';
+@import 'mastodon/introduction';
 @import 'mastodon/modal';
 @import 'mastodon/emoji_picker';
 @import 'mastodon/about';
diff --git a/app/javascript/styles/mastodon/components.scss b/app/javascript/styles/mastodon/components.scss
index 1c1b8c506..d2b3baaf0 100644
--- a/app/javascript/styles/mastodon/components.scss
+++ b/app/javascript/styles/mastodon/components.scss
@@ -3835,25 +3835,6 @@ a.status-card.compact:hover {
   flex-direction: column;
 }
 
-.onboarding-modal__pager {
-  height: 80vh;
-  width: 80vw;
-  max-width: 520px;
-  max-height: 470px;
-
-  .react-swipeable-view-container > div {
-    width: 100%;
-    height: 100%;
-    box-sizing: border-box;
-    display: none;
-    flex-direction: column;
-    align-items: center;
-    justify-content: center;
-    display: flex;
-    user-select: text;
-  }
-}
-
 .error-modal__body {
   height: 80vh;
   width: 80vw;
@@ -3887,22 +3868,6 @@ a.status-card.compact:hover {
   text-align: center;
 }
 
-@media screen and (max-width: 550px) {
-  .onboarding-modal {
-    width: 100%;
-    height: 100%;
-    border-radius: 0;
-  }
-
-  .onboarding-modal__pager {
-    width: 100%;
-    height: auto;
-    max-width: none;
-    max-height: none;
-    flex: 1 1 auto;
-  }
-}
-
 .onboarding-modal__paginator,
 .error-modal__footer {
   flex: 0 0 auto;
@@ -3951,124 +3916,6 @@ a.status-card.compact:hover {
   justify-content: center;
 }
 
-.onboarding-modal__dots {
-  flex: 1 1 auto;
-  display: flex;
-  align-items: center;
-  justify-content: center;
-}
-
-.onboarding-modal__dot {
-  width: 14px;
-  height: 14px;
-  border-radius: 14px;
-  background: darken($ui-secondary-color, 16%);
-  margin: 0 3px;
-  cursor: pointer;
-
-  &:hover {
-    background: darken($ui-secondary-color, 18%);
-  }
-
-  &.active {
-    cursor: default;
-    background: darken($ui-secondary-color, 24%);
-  }
-}
-
-.onboarding-modal__page__wrapper {
-  pointer-events: none;
-  padding: 25px;
-  padding-bottom: 0;
-
-  &.onboarding-modal__page__wrapper--active {
-    pointer-events: auto;
-  }
-}
-
-.onboarding-modal__page {
-  cursor: default;
-  line-height: 21px;
-
-  h1 {
-    font-size: 18px;
-    font-weight: 500;
-    color: $inverted-text-color;
-    margin-bottom: 20px;
-  }
-
-  a {
-    color: $highlight-text-color;
-
-    &:hover,
-    &:focus,
-    &:active {
-      color: lighten($highlight-text-color, 4%);
-    }
-  }
-
-  .navigation-bar a {
-    color: inherit;
-  }
-
-  p {
-    font-size: 16px;
-    color: $lighter-text-color;
-    margin-top: 10px;
-    margin-bottom: 10px;
-
-    &:last-child {
-      margin-bottom: 0;
-    }
-
-    strong {
-      font-weight: 500;
-      background: $ui-base-color;
-      color: $secondary-text-color;
-      border-radius: 4px;
-      font-size: 14px;
-      padding: 3px 6px;
-
-      @each $lang in $cjk-langs {
-        &:lang(#{$lang}) {
-          font-weight: 700;
-        }
-      }
-    }
-  }
-}
-
-.onboarding-modal__page__wrapper-0 {
-  background: url('../images/elephant_ui_greeting.svg') no-repeat left bottom / auto 250px;
-  height: 100%;
-  padding: 0;
-}
-
-.onboarding-modal__page-one {
-  &__lead {
-    padding: 65px;
-    padding-top: 45px;
-    padding-bottom: 0;
-    margin-bottom: 10px;
-
-    h1 {
-      font-size: 26px;
-      line-height: 36px;
-      margin-bottom: 8px;
-    }
-
-    p {
-      margin-bottom: 0;
-    }
-  }
-
-  &__extra {
-    padding-right: 65px;
-    padding-left: 185px;
-    text-align: center;
-  }
-}
-
 .display-case {
   text-align: center;
   font-size: 15px;
@@ -4091,92 +3938,6 @@ a.status-card.compact:hover {
   }
 }
 
-.onboarding-modal__page-two,
-.onboarding-modal__page-three,
-.onboarding-modal__page-four,
-.onboarding-modal__page-five {
-  p {
-    text-align: left;
-  }
-
-  .figure {
-    background: darken($ui-base-color, 8%);
-    color: $secondary-text-color;
-    margin-bottom: 20px;
-    border-radius: 4px;
-    padding: 10px;
-    text-align: center;
-    font-size: 14px;
-    box-shadow: 1px 2px 6px rgba($base-shadow-color, 0.3);
-
-    .onboarding-modal__image {
-      border-radius: 4px;
-      margin-bottom: 10px;
-    }
-
-    &.non-interactive {
-      pointer-events: none;
-      text-align: left;
-    }
-  }
-}
-
-.onboarding-modal__page-four__columns {
-  .row {
-    display: flex;
-    margin-bottom: 20px;
-
-    & > div {
-      flex: 1 1 0;
-      margin: 0 10px;
-
-      &:first-child {
-        margin-left: 0;
-      }
-
-      &:last-child {
-        margin-right: 0;
-      }
-
-      p {
-        text-align: center;
-      }
-    }
-
-    &:last-child {
-      margin-bottom: 0;
-    }
-  }
-
-  .column-header {
-    color: $primary-text-color;
-  }
-}
-
-@media screen and (max-width: 320px) and (max-height: 600px) {
-  .onboarding-modal__page p {
-    font-size: 14px;
-    line-height: 20px;
-  }
-
-  .onboarding-modal__page-two .figure,
-  .onboarding-modal__page-three .figure,
-  .onboarding-modal__page-four .figure,
-  .onboarding-modal__page-five .figure {
-    font-size: 12px;
-    margin-bottom: 10px;
-  }
-
-  .onboarding-modal__page-four__columns .row {
-    margin-bottom: 10px;
-  }
-
-  .onboarding-modal__page-four__columns .column-header {
-    padding: 5px;
-    font-size: 12px;
-  }
-}
-
 .onboard-sliders {
   display: inline-block;
   max-width: 30px;
diff --git a/app/javascript/styles/mastodon/introduction.scss b/app/javascript/styles/mastodon/introduction.scss
new file mode 100644
index 000000000..222d8f60e
--- /dev/null
+++ b/app/javascript/styles/mastodon/introduction.scss
@@ -0,0 +1,153 @@
+.introduction {
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+
+  @media screen and (max-width: 920px) {
+    background: darken($ui-base-color, 8%);
+    display: block !important;
+  }
+
+  &__pager {
+    background: darken($ui-base-color, 8%);
+    box-shadow: 0 0 15px rgba($base-shadow-color, 0.2);
+    overflow: hidden;
+  }
+
+  &__pager,
+  &__frame {
+    border-radius: 10px;
+    width: 50vw;
+    min-width: 920px;
+
+    @media screen and (max-width: 920px) {
+      min-width: 0;
+      width: 100%;
+      border-radius: 0;
+      box-shadow: none;
+    }
+  }
+
+  &__frame-wrapper {
+    opacity: 0;
+    transition: opacity 500ms linear;
+
+    &.active {
+      opacity: 1;
+      transition: opacity 50ms linear;
+    }
+  }
+
+  &__frame {
+    overflow: hidden;
+  }
+
+  &__illustration {
+    height: 50vh;
+
+    @media screen and (max-width: 630px) {
+      height: auto;
+    }
+
+    img {
+      object-fit: cover;
+      display: block;
+      margin: 0;
+      width: 100%;
+      height: 100%;
+    }
+  }
+
+  &__text {
+    border-top: 2px solid $ui-highlight-color;
+
+    &--columnized {
+      display: flex;
+
+      & > div {
+        flex: 1 1 33.33%;
+        text-align: center;
+        padding: 25px;
+        padding-bottom: 30px;
+      }
+
+      @media screen and (max-width: 630px) {
+        display: block;
+        padding: 15px 0;
+        padding-bottom: 20px;
+
+        & > div {
+          padding: 10px 25px;
+        }
+      }
+    }
+
+    h3 {
+      font-size: 24px;
+      line-height: 1.5;
+      font-weight: 700;
+      margin-bottom: 10px;
+    }
+
+    p {
+      font-size: 16px;
+      line-height: 24px;
+      font-weight: 400;
+      color: $darker-text-color;
+
+      code {
+        display: inline-block;
+        background: darken($ui-base-color, 8%);
+        font-size: 15px;
+        border: 1px solid lighten($ui-base-color, 8%);
+        border-radius: 2px;
+        padding: 1px 3px;
+      }
+    }
+
+    &--centered {
+      padding: 25px;
+      padding-bottom: 30px;
+      text-align: center;
+    }
+  }
+
+  &__dots {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    padding: 25px;
+
+    @media screen and (max-width: 630px) {
+      display: none;
+    }
+  }
+
+  &__dot {
+    width: 14px;
+    height: 14px;
+    border-radius: 14px;
+    border: 1px solid $ui-highlight-color;
+    background: transparent;
+    margin: 0 3px;
+    cursor: pointer;
+
+    &:hover {
+      background: lighten($ui-base-color, 8%);
+    }
+
+    &.active {
+      cursor: default;
+      background: $ui-highlight-color;
+    }
+  }
+
+  &__action {
+    padding: 25px;
+    padding-top: 0;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+  }
+}