diff --git a/core/modules/system/src/Tests/Menu/MenuRouterTest.php b/core/modules/system/src/Tests/Menu/MenuRouterTest.php
index 4383658..5a93df2 100644
--- a/core/modules/system/src/Tests/Menu/MenuRouterTest.php
+++ b/core/modules/system/src/Tests/Menu/MenuRouterTest.php
@@ -397,7 +397,7 @@ public function testThemeIntegration() {
   protected function doTestThemeCallbackAdministrative() {
     $this->drupalGet('menu-test/theme-callback/use-admin-theme');
     $this->assertText('Active theme: seven. Actual theme: seven.', 'The administrative theme can be correctly set in a theme negotiation.');
-    $this->assertRaw('seven/style.css', "The administrative theme's CSS appears on the page.");
+    $this->assertRaw('seven/css/style.css', "The administrative theme's CSS appears on the page.");
   }
 
   /**
@@ -416,7 +416,7 @@ protected function doTestThemeCallbackMaintenanceMode() {
     $this->drupalLogin($admin_user);
     $this->drupalGet('menu-test/theme-callback/use-admin-theme');
     $this->assertText('Active theme: seven. Actual theme: seven.', 'The theme negotiation system is correctly triggered for an administrator when the site is in maintenance mode.');
-    $this->assertRaw('seven/style.css', "The administrative theme's CSS appears on the page.");
+    $this->assertRaw('seven/css/style.css', "The administrative theme's CSS appears on the page.");
 
     $this->container->get('state')->set('system.maintenance_mode', FALSE);
   }
diff --git a/core/modules/taxonomy/src/Tests/ThemeTest.php b/core/modules/taxonomy/src/Tests/ThemeTest.php
index ee8cc38..727a969 100644
--- a/core/modules/taxonomy/src/Tests/ThemeTest.php
+++ b/core/modules/taxonomy/src/Tests/ThemeTest.php
@@ -45,7 +45,7 @@ function testTaxonomyTermThemes() {
     // should use the administrative theme.
     $vocabulary = $this->createVocabulary();
     $this->drupalGet('admin/structure/taxonomy/manage/' . $vocabulary->id() . '/add');
-    $this->assertRaw('seven/style.css', t("The administrative theme's CSS appears on the page for adding a taxonomy term."));
+    $this->assertRaw('seven/css/style.css', t("The administrative theme's CSS appears on the page for adding a taxonomy term."));
 
     // Viewing a taxonomy term should use the default theme.
     $term = $this->createTerm($vocabulary);
@@ -54,6 +54,6 @@ function testTaxonomyTermThemes() {
 
     // Editing a taxonomy term should use the same theme as adding one.
     $this->drupalGet('taxonomy/term/' . $term->id() . '/edit');
-    $this->assertRaw('seven/style.css', t("The administrative theme's CSS appears on the page for editing a taxonomy term."));
+    $this->assertRaw('seven/css/style.css', t("The administrative theme's CSS appears on the page for editing a taxonomy term."));
   }
 }
diff --git a/core/themes/seven/css/install-page.css b/core/themes/seven/css/install-page.css
new file mode 100644
index 0000000..5c3bf83
--- /dev/null
+++ b/core/themes/seven/css/install-page.css
@@ -0,0 +1,49 @@
+/**
+ * @file
+ * Installation styling.
+ *
+ * Unfortunately we have to make our styling quite strong, to override the
+ * .in-maintenance styling.
+ */
+.install-background {
+  background-color: #1275b2;
+  background-image:
+    url('images/noise-low.png'),
+    -webkit-radial-gradient(hsl(203, 80%, 45%), hsl(203, 80%, 32%));
+  background-image:
+    url('images/noise-low.png'),
+    -moz-radial-gradient(hsl(203, 80%, 45%), hsl(203, 80%, 32%));
+  background-image:
+    url('images/noise-low.png'),
+    -o-radial-gradient(hsl(203, 80%, 45%), hsl(203, 80%, 32%));
+  background-image:
+    url('images/noise-low.png'),
+    radial-gradient(hsl(203, 80%, 45%), hsl(203, 80%, 32%));
+  background-repeat: repeat;
+  background-position: left top, 50% 50%;
+  min-height: 100%;
+}
+
+/**
+ * Password widget
+ */
+.install-page .password-parent,
+.install-page .confirm-parent {
+  width: auto;
+}
+.install-page .form-item .password-suggestions {
+  float: none;
+  width: auto;
+}
+@media all and (max-width: 1010px) and (min-width: 48em) {
+  .install-page .password-strength,
+  .install-page .confirm-parent,
+  .install-page .password-confirm {
+    float: none;
+    width: auto;
+  }
+  input.password-confirm,
+  input.password-field {
+    float: none;
+  }
+}
diff --git a/core/themes/seven/css/jquery.ui.theme.css b/core/themes/seven/css/jquery.ui.theme.css
new file mode 100644
index 0000000..17dc06a
--- /dev/null
+++ b/core/themes/seven/css/jquery.ui.theme.css
@@ -0,0 +1,383 @@
+/**
+ * @file
+ * Seven styles for jQuery UI.
+ * Overrides /core/assets/vendor/jquery.ui/ui.theme.css.
+ */
+
+/**
+ * Component containers
+ */
+.ui-widget {
+  background: #fff;
+}
+.ui-widget-content {
+  border: solid 1px #ccc;
+}
+
+/**
+ * Interaction states
+ */
+.ui-state-default,
+.ui-state-hover,
+.ui-state-focus,
+.ui-state-active {
+  outline: 0;
+}
+.ui-state-active {
+  font-weight: bold;
+}
+
+/**
+ * Interaction cues
+ */
+.ui-state-highlight,
+.ui-widget-content .ui-state-highlight {
+  color: #840;
+  background: #fe6;
+  border: solid 1px #ed5;
+}
+.ui-state-error,
+.ui-widget-content .ui-state-error {
+  color: #fff;
+  background: #e63;
+  border-color: #d52;
+}
+.ui-state-disabled,
+.ui-widget-content .ui-state-disabled {
+  opacity: .35;
+  filter: Alpha(Opacity=35);
+}
+.ui-priority-secondary,
+.ui-widget-content .ui-priority-secondary {
+  opacity: .7;
+  filter: Alpha(Opacity=70);
+}
+
+/**
+ * Icons
+ */
+/* states and images */
+.ui-icon {
+  display: block;
+  text-indent: -99999px;
+  width: 16px;
+  height: 16px;
+  overflow: hidden;
+  background-repeat: no-repeat;
+  background-image: url(images/ui-icons-222222-256x240.png);
+}
+.ui-widget-content .ui-icon,
+.ui-widget-header .ui-icon {
+  background-image: url(images/ui-icons-222222-256x240.png);
+}
+.ui-state-default .ui-icon {
+  background-image: url(images/ui-icons-888888-256x240.png);
+}
+.ui-state-hover .ui-icon,
+.ui-state-focus .ui-icon,
+.ui-state-active .ui-icon {
+  background-image: url(images/ui-icons-454545-256x240.png);
+}
+.ui-state-highlight .ui-icon {
+  background-image: url(images/ui-icons-800000-256x240.png);
+}
+.ui-state-error .ui-icon,
+.ui-state-error-text .ui-icon {
+  background-image: url(images/ui-icons-ffffff-256x240.png);
+}
+.ui-widget p .ui-icon {
+  margin: 2px 3px 0 0;
+}
+
+/* positioning */
+.ui-icon-carat-1-ne { background-position: -16px 0; }
+.ui-icon-carat-1-e { background-position: -32px 0; }
+.ui-icon-carat-1-se { background-position: -48px 0; }
+.ui-icon-carat-1-s { background-position: -64px 0; }
+.ui-icon-carat-1-sw { background-position: -80px 0; }
+.ui-icon-carat-1-w { background-position: -96px 0; }
+.ui-icon-carat-1-nw { background-position: -112px 0; }
+.ui-icon-carat-2-n-s { background-position: -128px 0; }
+.ui-icon-carat-2-e-w { background-position: -144px 0; }
+.ui-icon-triangle-1-n { background-position: 0 -16px; }
+.ui-icon-triangle-1-ne { background-position: -16px -16px; }
+.ui-icon-triangle-1-e { background-position: -32px -16px; }
+.ui-icon-triangle-1-se { background-position: -48px -16px; }
+.ui-icon-triangle-1-s { background-position: -64px -16px; }
+.ui-icon-triangle-1-sw { background-position: -80px -16px; }
+.ui-icon-triangle-1-w { background-position: -96px -16px; }
+.ui-icon-triangle-1-nw { background-position: -112px -16px; }
+.ui-icon-triangle-2-n-s { background-position: -128px -16px; }
+.ui-icon-triangle-2-e-w { background-position: -144px -16px; }
+.ui-icon-arrow-1-n { background-position: 0 -32px; }
+.ui-icon-arrow-1-ne { background-position: -16px -32px; }
+.ui-icon-arrow-1-e { background-position: -32px -32px; }
+.ui-icon-arrow-1-se { background-position: -48px -32px; }
+.ui-icon-arrow-1-s { background-position: -64px -32px; }
+.ui-icon-arrow-1-sw { background-position: -80px -32px; }
+.ui-icon-arrow-1-w { background-position: -96px -32px; }
+.ui-icon-arrow-1-nw { background-position: -112px -32px; }
+.ui-icon-arrow-2-n-s { background-position: -128px -32px; }
+.ui-icon-arrow-2-ne-sw { background-position: -144px -32px; }
+.ui-icon-arrow-2-e-w { background-position: -160px -32px; }
+.ui-icon-arrow-2-se-nw { background-position: -176px -32px; }
+.ui-icon-arrowstop-1-n { background-position: -192px -32px; }
+.ui-icon-arrowstop-1-e { background-position: -208px -32px; }
+.ui-icon-arrowstop-1-s { background-position: -224px -32px; }
+.ui-icon-arrowstop-1-w { background-position: -240px -32px; }
+.ui-icon-arrowthick-1-n { background-position: 0 -48px; }
+.ui-icon-arrowthick-1-ne { background-position: -16px -48px; }
+.ui-icon-arrowthick-1-e { background-position: -32px -48px; }
+.ui-icon-arrowthick-1-se { background-position: -48px -48px; }
+.ui-icon-arrowthick-1-s { background-position: -64px -48px; }
+.ui-icon-arrowthick-1-sw { background-position: -80px -48px; }
+.ui-icon-arrowthick-1-w { background-position: -96px -48px; }
+.ui-icon-arrowthick-1-nw { background-position: -112px -48px; }
+.ui-icon-arrowthick-2-n-s { background-position: -128px -48px; }
+.ui-icon-arrowthick-2-ne-sw { background-position: -144px -48px; }
+.ui-icon-arrowthick-2-e-w { background-position: -160px -48px; }
+.ui-icon-arrowthick-2-se-nw { background-position: -176px -48px; }
+.ui-icon-arrowthickstop-1-n { background-position: -192px -48px; }
+.ui-icon-arrowthickstop-1-e { background-position: -208px -48px; }
+.ui-icon-arrowthickstop-1-s { background-position: -224px -48px; }
+.ui-icon-arrowthickstop-1-w { background-position: -240px -48px; }
+.ui-icon-arrowreturnthick-1-w { background-position: 0 -64px; }
+.ui-icon-arrowreturnthick-1-n { background-position: -16px -64px; }
+.ui-icon-arrowreturnthick-1-e { background-position: -32px -64px; }
+.ui-icon-arrowreturnthick-1-s { background-position: -48px -64px; }
+.ui-icon-arrowreturn-1-w { background-position: -64px -64px; }
+.ui-icon-arrowreturn-1-n { background-position: -80px -64px; }
+.ui-icon-arrowreturn-1-e { background-position: -96px -64px; }
+.ui-icon-arrowreturn-1-s { background-position: -112px -64px; }
+.ui-icon-arrowrefresh-1-w { background-position: -128px -64px; }
+.ui-icon-arrowrefresh-1-n { background-position: -144px -64px; }
+.ui-icon-arrowrefresh-1-e { background-position: -160px -64px; }
+.ui-icon-arrowrefresh-1-s { background-position: -176px -64px; }
+.ui-icon-arrow-4 { background-position: 0 -80px; }
+.ui-icon-arrow-4-diag { background-position: -16px -80px; }
+.ui-icon-extlink { background-position: -32px -80px; }
+.ui-icon-newwin { background-position: -48px -80px; }
+.ui-icon-refresh { background-position: -64px -80px; }
+.ui-icon-shuffle { background-position: -80px -80px; }
+.ui-icon-transfer-e-w { background-position: -96px -80px; }
+.ui-icon-transferthick-e-w { background-position: -112px -80px; }
+.ui-icon-folder-collapsed { background-position: 0 -96px; }
+.ui-icon-folder-open { background-position: -16px -96px; }
+.ui-icon-document { background-position: -32px -96px; }
+.ui-icon-document-b { background-position: -48px -96px; }
+.ui-icon-note { background-position: -64px -96px; }
+.ui-icon-mail-closed { background-position: -80px -96px; }
+.ui-icon-mail-open { background-position: -96px -96px; }
+.ui-icon-suitcase { background-position: -112px -96px; }
+.ui-icon-comment { background-position: -128px -96px; }
+.ui-icon-person { background-position: -144px -96px; }
+.ui-icon-print { background-position: -160px -96px; }
+.ui-icon-trash { background-position: -176px -96px; }
+.ui-icon-locked { background-position: -192px -96px; }
+.ui-icon-unlocked { background-position: -208px -96px; }
+.ui-icon-bookmark { background-position: -224px -96px; }
+.ui-icon-tag { background-position: -240px -96px; }
+.ui-icon-home { background-position: 0 -112px; }
+.ui-icon-flag { background-position: -16px -112px; }
+.ui-icon-calendar { background-position: -32px -112px; }
+.ui-icon-cart { background-position: -48px -112px; }
+.ui-icon-pencil { background-position: -64px -112px; }
+.ui-icon-clock { background-position: -80px -112px; }
+.ui-icon-disk { background-position: -96px -112px; }
+.ui-icon-calculator { background-position: -112px -112px; }
+.ui-icon-zoomin { background-position: -128px -112px; }
+.ui-icon-zoomout { background-position: -144px -112px; }
+.ui-icon-search { background-position: -160px -112px; }
+.ui-icon-wrench { background-position: -176px -112px; }
+.ui-icon-gear { background-position: -192px -112px; }
+.ui-icon-heart { background-position: -208px -112px; }
+.ui-icon-star { background-position: -224px -112px; }
+.ui-icon-link { background-position: -240px -112px; }
+.ui-icon-cancel { background-position: 0 -128px; }
+.ui-icon-plus { background-position: -16px -128px; }
+.ui-icon-plusthick { background-position: -32px -128px; }
+.ui-icon-minus { background-position: -48px -128px; }
+.ui-icon-minusthick { background-position: -64px -128px; }
+.ui-icon-close { background-position: -80px -128px; }
+.ui-icon-closethick { background-position: -96px -128px; }
+.ui-icon-key { background-position: -112px -128px; }
+.ui-icon-lightbulb { background-position: -128px -128px; }
+.ui-icon-scissors { background-position: -144px -128px; }
+.ui-icon-clipboard { background-position: -160px -128px; }
+.ui-icon-copy { background-position: -176px -128px; }
+.ui-icon-contact { background-position: -192px -128px; }
+.ui-icon-image { background-position: -208px -128px; }
+.ui-icon-video { background-position: -224px -128px; }
+.ui-icon-script { background-position: -240px -128px; }
+.ui-icon-alert { background-position: 0 -144px; }
+.ui-icon-info { background-position: -16px -144px; }
+.ui-icon-notice { background-position: -32px -144px; }
+.ui-icon-help { background-position: -48px -144px; }
+.ui-icon-check { background-position: -64px -144px; }
+.ui-icon-bullet { background-position: -80px -144px; }
+.ui-icon-radio-off { background-position: -96px -144px; }
+.ui-icon-radio-on { background-position: -112px -144px; }
+.ui-icon-pin-w { background-position: -128px -144px; }
+.ui-icon-pin-s { background-position: -144px -144px; }
+.ui-icon-play { background-position: 0 -160px; }
+.ui-icon-pause { background-position: -16px -160px; }
+.ui-icon-seek-next { background-position: -32px -160px; }
+.ui-icon-seek-prev { background-position: -48px -160px; }
+.ui-icon-seek-end { background-position: -64px -160px; }
+.ui-icon-seek-first { background-position: -80px -160px; }
+.ui-icon-stop { background-position: -96px -160px; }
+.ui-icon-eject { background-position: -112px -160px; }
+.ui-icon-volume-off { background-position: -128px -160px; }
+.ui-icon-volume-on { background-position: -144px -160px; }
+.ui-icon-power { background-position: 0 -176px; }
+.ui-icon-signal-diag { background-position: -16px -176px; }
+.ui-icon-signal { background-position: -32px -176px; }
+.ui-icon-battery-0 { background-position: -48px -176px; }
+.ui-icon-battery-1 { background-position: -64px -176px; }
+.ui-icon-battery-2 { background-position: -80px -176px; }
+.ui-icon-battery-3 { background-position: -96px -176px; }
+.ui-icon-circle-plus { background-position: 0 -192px; }
+.ui-icon-circle-minus { background-position: -16px -192px; }
+.ui-icon-circle-close { background-position: -32px -192px; }
+.ui-icon-circle-triangle-e { background-position: -48px -192px; }
+.ui-icon-circle-triangle-s { background-position: -64px -192px; }
+.ui-icon-circle-triangle-w { background-position: -80px -192px; }
+.ui-icon-circle-triangle-n { background-position: -96px -192px; }
+.ui-icon-circle-arrow-e { background-position: -112px -192px; }
+.ui-icon-circle-arrow-s { background-position: -128px -192px; }
+.ui-icon-circle-arrow-w { background-position: -144px -192px; }
+.ui-icon-circle-arrow-n { background-position: -160px -192px; }
+.ui-icon-circle-zoomin { background-position: -176px -192px; }
+.ui-icon-circle-zoomout { background-position: -192px -192px; }
+.ui-icon-circle-check { background-position: -208px -192px; }
+.ui-icon-circlesmall-plus { background-position: 0 -208px; }
+.ui-icon-circlesmall-minus { background-position: -16px -208px; }
+.ui-icon-circlesmall-close { background-position: -32px -208px; }
+.ui-icon-squaresmall-plus { background-position: -48px -208px; }
+.ui-icon-squaresmall-minus { background-position: -64px -208px; }
+.ui-icon-squaresmall-close { background-position: -80px -208px; }
+.ui-icon-grip-dotted-vertical { background-position: 0 -224px; }
+.ui-icon-grip-dotted-horizontal { background-position: -16px -224px; }
+.ui-icon-grip-solid-vertical { background-position: -32px -224px; }
+.ui-icon-grip-solid-horizontal { background-position: -48px -224px; }
+.ui-icon-gripsmall-diagonal-se { background-position: -64px -224px; }
+.ui-icon-grip-diagonal-se { background-position: -80px -224px; }
+.ui-icon-carat-1-n { background-position: 0 0; }
+
+/**
+ * Accordion
+ */
+.ui-accordion {
+  border: none;
+}
+.ui-accordion .ui-accordion-header {
+  border: solid 1px #ccc;
+  text-transform: uppercase;
+}
+.ui-accordion h3.ui-accordion-header,
+#block-system-main h3.ui-accordion-header {
+  font-size: 1.1em;
+  margin: 10px 0;
+}
+#block-system-main .ui-accordion h3.ui-state-active,
+.ui-accordion h3.ui-state-active {
+  margin-bottom: 0;
+}
+.ui-accordion .ui-accordion-header a {
+  display: block;
+}
+.ui-accordion .ui-accordion-content {
+  padding: 1em 2.2em;
+  border: solid 1px #ccc;
+  border-top: 0;
+}
+
+/**
+ * Tabs
+ */
+.ui-tabs {
+  padding: 0;
+}
+.ui-tabs .ui-tabs-nav {
+  padding: 5px 10px 4px;
+  margin: 0;
+  line-height: 20px;
+  border-bottom: solid 1px #ccc;
+  border-bottom-left-radius: 0;
+  border-bottom-right-radius: 0;
+}
+.ui-tabs .ui-tabs-nav li {
+  padding: 0 1em 0 10px;
+  margin: 0;
+  list-style: none;
+}
+.ui-tabs .ui-tabs-nav li a {
+  float: none;
+  padding: 0 10px;
+  border-radius: 10px;
+}
+.ui-tabs .ui-tabs-nav li.ui-tabs-selected a {
+  color: #fff;
+  background: #666;
+  font-weight: normal;
+}
+
+/**
+ * Overlays
+ */
+.ui-widget-overlay {
+  background: #000;
+  opacity: .70;
+  filter: Alpha(Opacity=70);
+}
+
+/**
+ * Slider
+ */
+.ui-slider {
+  border: solid 1px #ccc;
+}
+.ui-slider .ui-slider-range {
+  background: #e4e4e4;
+}
+.ui-slider .ui-slider-handle {
+  border: 1px solid #e4e4e4;
+  border-bottom: 1px solid #b4b4b4;
+  border-left-color: #D2D2D2;
+  border-right-color: #D2D2D2;
+  background-color: #e4e4e4;
+  border-radius: 4px;
+}
+.ui-slider a.ui-state-active,
+.ui-slider .ui-slider-handle:active {
+  background: #666;
+  color: #fff;
+  border: solid 1px #555;
+}
+
+/**
+ * Progress Bar
+ */
+.ui-progressbar {
+  background: #e4e4e4;
+  height: 1.4em;
+}
+.ui-progressbar .ui-progressbar-value {
+  background: #0072b9 url(../../misc/progress.gif);
+  height: 1.5em;
+}
+
+/**
+ * Date Picker
+ */
+.ui-datepicker {
+  border: none;
+}
+.ui-datepicker td span, .ui-datepicker td a {
+  text-align: center;
+}
+.ui-datepicker .ui-state-highlight {
+  background: #E4E4E4;
+  border-color: #D2D2D2;
+  color: #000;
+}
diff --git a/core/themes/seven/css/maintenance-page.css b/core/themes/seven/css/maintenance-page.css
new file mode 100644
index 0000000..bc56fa0
--- /dev/null
+++ b/core/themes/seven/css/maintenance-page.css
@@ -0,0 +1,184 @@
+/**
+ * @file
+ * Maintenance theming.
+ */
+.maintenance-background {
+  background-color: #e0e0d8;
+  background-image: -webkit-radial-gradient(hsl(203, 2%, 90%), hsl(203, 2%, 95%));
+  background-image: -moz-radial-gradient(hsl(203, 2%, 90%), hsl(203, 2%, 95%));
+  background-image: -o-radial-gradient(hsl(203, 2%, 90%), hsl(203, 2%, 95%));
+  background-image: radial-gradient(hsl(203, 2%, 90%), hsl(203, 2%, 95%));
+  background-repeat: repeat;
+  background-position: left top, 50% 50%;
+  min-height: 100%;
+}
+
+/* Maintenance theming */
+.install-page,
+.in-maintenance {
+  background: none;
+}
+.name-and-slogan h1 {
+  font-size: 2em;
+  line-height: 1.2em;
+  color: #0074bd;
+}
+
+/**
+ * Task list & step indicator
+ */
+@media all and (max-width: 48em) { /* 768px */
+  header[role="banner"] {
+    position: relative;
+  }
+  .step-indicator {
+    display: block;
+    font-size: 1.385em;
+    position: absolute;
+    top: 0.2em;
+    right: 0.5em;
+  }
+  [dir="rtl"] .step-indicator {
+    left: 2em;
+    right: auto;
+  }
+  .task-list {
+    display: none;
+  }
+}
+
+@media all and (min-width: 48em) { /* 768px */
+  .step-indicator {
+    display: none;
+  }
+  .task-list {
+    margin-left: 0; /* LTR */
+    list-style-type: none;
+    list-style-image: none;
+    padding-left: 0; /* LTR */
+    padding-bottom: 1em;
+  }
+  [dir="rtl"] .task-list {
+    margin-right: 0;
+    padding-right: 0;
+  }
+  .task-list li {
+    padding: 0.5em 1em 0.5em 3.85em; /* LTR */
+    color: #1a1a1a;
+  }
+  [dir="rtl"] .task-list li {
+    padding: 0.5em 1em 0.5em 1em;
+  }
+  .task-list .active {
+    background: #ebeae4;
+    position: relative;
+    font-weight: normal;
+  }
+  .task-list .active:after {
+    left: 100%; /* LTR */
+    border: solid transparent;
+    border-color: rgba(235, 234, 228, 0);
+    border-left-color: #ebeae4; /* LTR */
+    border-width: 1.35em;
+    content: " ";
+    height: 0;
+    width: 0;
+    position: absolute;
+    pointer-events: none;
+    top: 50%;
+    margin-top: -1.32em;
+  }
+  [dir="rtl"] .task-list .active:after {
+    left: auto;
+    right: 100%;
+    border-left-color: transparent;
+    border-right-color: #ebeae4;
+  }
+  .task-list .done {
+    color: #adadad;
+  }
+}
+
+/**
+ * Layout
+ */
+.l-container {
+  background: #fff;
+  width: auto;
+  margin-left: 1.25em;
+  margin-right: 1.25em;
+}
+.l-container:after { /* no reason for a clearfix in the markup */
+  content: "";
+  display: table;
+  clear: both;
+}
+@media all and (max-width: 48em) { /* 768px */
+  .l-container {
+    margin: 1.25em;
+    padding: 10px 20px;
+  }
+  .name-and-slogan {
+    margin: 0 0 1.45em 0;
+  }
+}
+
+@media all and (min-width: 48em) { /* 768px */
+  html {
+    display: table;
+  }
+  .in-maintenance,
+  .install-page {
+    display: table-cell;
+    padding: 1em 0;
+    vertical-align: middle;
+  }
+  html, .install-page, .in-maintenance {
+    margin: 0;
+    width: 100%;
+    height: 100%;
+  }
+  .l-container {
+    margin: 0 auto;
+    max-width: 770px;
+    width: 75%;
+    border-radius: 5px;
+    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
+    padding: 20px 0 40px 0;
+  }
+
+  /* Positioning sidebar & content */
+  main {
+    -webkit-box-sizing: border-box;
+    -moz-box-sizing: border-box;
+    box-sizing: border-box;
+    clear: none;
+    float: left;
+    padding-left: 3.85em;
+    padding-right: 3.85em;
+    width: 65%;
+  }
+  [dir="rtl"] main {
+    float: right;
+  }
+  ul {
+    padding: 15px;
+    margin: 0.25em 0;
+  }
+  .l-sidebar-first {
+    float: left;
+    width: 35%;
+  }
+  [dir="rtl"] .l-sidebar-first {
+    float: right;
+  }
+
+  /* Margins for sitename */
+  h1.page-title,
+  .name-and-slogan h1 {
+    margin: 0.75em 0 0.75em 1.9em; /* LTR */
+  }
+  [dir="rtl"] .name-and-slogan h1 {
+    margin: 0.75em 1.9em 0.75em 0;
+  }
+}
diff --git a/core/themes/seven/css/quickedit.css b/core/themes/seven/css/quickedit.css
new file mode 100644
index 0000000..5172b60
--- /dev/null
+++ b/core/themes/seven/css/quickedit.css
@@ -0,0 +1,67 @@
+/**
+ * @file
+ * Override Quick Edit's entity toolbar style on the Drupal front-end.
+ *
+ * I.e. loaded by Quick Edit on the front-end, despite this being a back-end theme.
+ */
+
+/**
+ * The Seven style guide prescribes softer corners.
+ */
+.quickedit-toolbar-container > .quickedit-toolbar-content,
+.quickedit-toolbar-container > .quickedit-toolbar-lining {
+  border-radius: 4px;
+}
+.quickedit-button {
+  border-radius: 3px;
+}
+
+/**
+ * Entity toolbar's "save" button must be styled like a Seven primary button.
+ */
+.quickedit-button.action-save,
+.quickedit-button.action-saving {
+  border-color: #1e5c90;
+  background-image: -webkit-linear-gradient(top, #007bc6, #0071b8);
+  background-image:    -moz-linear-gradient(top, #007bc6, #0071b8);
+  background-image:      -o-linear-gradient(top, #007bc6, #0071b8);
+  background-image:   linear-gradient(to bottom, #007bc6, #0071b8);
+  color: #fff;
+  text-shadow: 0 1px hsla(0, 0%, 0%, 0.5);
+  font-weight: 700;
+  -webkit-font-smoothing: antialiased;
+  margin-top: 2px;
+}
+.quickedit-button.action-save:focus,
+.quickedit-button.action-save:hover,
+.quickedit-button.action-saving:focus
+.quickedit-button.action-saving:hover {
+  background-color: #2369a6;
+  background-image: -webkit-linear-gradient(top, #0c97ed, #1f86c7);
+  background-image:    -moz-linear-gradient(top, #0c97ed, #1f86c7);
+  background-image:      -o-linear-gradient(top, #0c97ed, #1f86c7);
+  background-image:   linear-gradient(to bottom, #0c97ed, #1f86c7);
+  border-color: #1e5c90;
+  color: #fff;
+}
+.quickedit-button.action-save:hover,
+.quickedit-button.action-saving:hover {
+  box-shadow: 0 1px 2px hsla(203, 10%, 10%, 0.25);
+}
+.quickedit-button.action-save:active,
+.quickedit-button.action-saving:active {
+  background-image: -webkit-linear-gradient(top, #08639b, #0071b8);
+  background-image:    -moz-linear-gradient(top, #08639b, #0071b8);
+  background-image:      -o-linear-gradient(top, #08639b, #0071b8);
+  background-image:   linear-gradient(to bottom, #08639b, #0071b8);
+  border-color: #144b78;
+  box-shadow: inset 0 1px 3px hsla(0, 0%, 0%, 0.2);
+}
+
+/**
+ * The entity toolbar's "save" button's top margin shifts both buttons 2px down,
+ * so we must compensate for that to achieve vertically centered positioning.
+ */
+.quickedit .icon-close:before {
+  top: 8px;
+}
diff --git a/core/themes/seven/css/seven.base.css b/core/themes/seven/css/seven.base.css
new file mode 100644
index 0000000..844712d
--- /dev/null
+++ b/core/themes/seven/css/seven.base.css
@@ -0,0 +1,136 @@
+/**
+ * Generic elements.
+ */
+body {
+  color: #000;
+  background: #fff;
+  font: normal 81.3%/1.538em "Lucida Grande", "Lucida Sans Unicode", sans-serif;
+}
+a,
+.link {
+  color: #0074bd;
+  text-decoration: none;
+}
+a:hover,
+.link:hover {
+  text-decoration: underline;
+}
+hr {
+  margin: 0;
+  padding: 0;
+  border: none;
+  height: 1px;
+  background: #cccccc;
+}
+summary,
+.fieldgroup:not(.form-composite) > legend {
+  font-weight: bold;
+  text-transform: uppercase;
+}
+h1,
+h2,
+h3,
+h4,
+h5,
+h6 {
+  font-weight: bold;
+  margin: 10px 0;
+}
+h1 {
+  font-size: 1.538em;
+}
+h2 {
+  font-size: 1.385em;
+}
+h3 {
+  font-size: 1.231em;
+}
+h4 {
+  font-size: 1.154em;
+}
+h5,
+h6 {
+  font-size: 1.077em;
+}
+p {
+  margin: 1em 0;
+}
+dl {
+  margin: 0 0 20px;
+}
+dl dd,
+dl dl {
+  margin-left: 20px; /* LTR */
+  margin-bottom: 10px;
+}
+[dir="rtl"] dl dd,
+[dir="rtl"] dl dl {
+  margin-right: 20px;
+}
+blockquote {
+  margin: 1em 40px;
+}
+address {
+  font-style: italic;
+}
+u,
+ins {
+  text-decoration: underline;
+}
+s,
+strike,
+del {
+  text-decoration: line-through;
+}
+big {
+  font-size: larger;
+}
+small {
+  font-size: smaller;
+}
+sub {
+  vertical-align: sub;
+  font-size: smaller;
+  line-height: normal;
+}
+sup {
+  vertical-align: super;
+  font-size: smaller;
+  line-height: normal;
+}
+nobr {
+  white-space: nowrap;
+}
+abbr,
+acronym {
+  border-bottom: dotted 1px;
+}
+ul {
+  list-style-type: disc;
+  list-style-image: none;
+  margin: 0.25em 0 0.25em 1.5em; /* LTR */
+}
+[dir="rtl"] ul {
+  margin: 0.25em 1.5em 0.25em 0;
+}
+ol {
+  list-style-type: decimal;
+  margin: 0.25em 0 0.25em 2em; /* LTR */
+  padding: 0;
+}
+[dir="rtl"] ol {
+  margin: 0.25em 2em 0.25em 0;
+}
+quote,
+code {
+  margin: .5em 0;
+}
+code,
+pre,
+kbd {
+  font-size: 1.231em;
+}
+pre {
+  margin: 0.5em 0;
+  white-space: pre-wrap;
+}
diff --git a/core/themes/seven/css/style.css b/core/themes/seven/css/style.css
new file mode 100644
index 0000000..f1cb442
--- /dev/null
+++ b/core/themes/seven/css/style.css
@@ -0,0 +1,1505 @@
+/**
+ * Menus and lists.
+ */
+.item-list ul {
+  list-style-type: disc;
+  list-style-image: none;
+  margin: 0.25em 0 0.25em 1.5em; /* LTR */
+}
+[dir="rtl"] .item-list ul {
+  margin: 0.25em 1.5em 0.25em 0;
+}
+.item-list ul li,
+li.leaf,
+ul.menu li {
+  list-style-type: disc;
+  list-style-image: none;
+}
+ul.menu li {
+  margin: 0;
+}
+.item-list ul li.collapsed,
+ul.menu li.collapsed {
+  list-style-image: url(../../misc/menu-collapsed.png);
+  list-style-type: disc;
+}
+.item-list ul li.expanded,
+ul.menu li.expanded {
+  list-style-image: url(../../misc/menu-expanded.png);
+  list-style-type: circle;
+}
+/**
+ * Skip link.
+ */
+.skip-link {
+  margin-top: 0;
+  position: absolute;
+  left: 50%; /* LTR */
+  margin-left: -5.25em; /* LTR */
+  width: auto;
+  z-index: 50;
+}
+[dir="rtl"] .skip-link {
+  right: 50%;
+  margin-right: -5.25em;
+}
+.skip-link,
+.skip-link:link,
+.skip-link:visited {
+  display: inline-block;
+  background: #444;
+  color: #fff;
+  font-size: 0.94em;
+  padding: 1px 10px 2px 10px; /* LTR */
+  text-decoration: none;
+  border-radius: 0 0 10px 10px;
+}
+[dir="rtl"] .skip-link,
+[dir="rtl"] .skip-link:link,
+[dir="rtl"] .skip-link:visited {
+  padding: 1px 10px 2px 10px;
+}
+.skip-link:hover,
+.skip-link:focus,
+.skip-link:active {
+  outline: 0;
+}
+.skip-link.visually-hidden.focusable:active,
+.skip-link.visually-hidden.focusable:focus,
+.skip-link.visually-hidden.focusable:hover
+{
+  position: absolute !important;
+}
+
+/**
+ * Branding.
+ */
+#branding {
+  overflow: hidden;
+  background-color: #e0e0d8;
+  padding: 24px 0 0;
+}
+/* This layout styling is a copy of #page.
+ * @TODO: Replace with reuseable layout classes.
+ **/
+.branding__inner {
+  margin-left: 1.25em;
+  margin-right: 1.25em;
+}
+@media screen and (min-width:45em) { /* 720px */
+  .branding__inner {
+    margin-left: 2.5em;
+    margin-right: 2.5em;
+  }
+}
+[dir="rtl"] #branding {
+  padding: 20px 20px 0 20px;
+}
+.breadcrumb {
+  font-size: 0.846em;
+  line-height: 1em;
+  padding: 20px 0 10px 0;
+}
+
+/**
+ * Help.
+ */
+#help {
+  font-size: 0.923em;
+}
+#help p {
+  margin: 0 0 10px;
+}
+#help div.more-help-link {
+  text-align: right; /* LTR */
+}
+[dir="rtl"] #help div.more-help-link {
+  text-align: left;
+}
+
+/**
+ * Page title.
+ */
+#page-title {
+  padding-top: 20px;
+}
+#branding .page-title {
+  color: #333;
+  display: inline-block;
+  margin: 0;
+  font-size: 1.625em;
+  line-height: 1.875em;
+  font-weight: 600;
+  -webkit-font-smoothing: antialiased;
+}
+[dir="rtl"] #branding h1.page-title {
+  float: right;
+}
+
+/**
+ * Console.
+ */
+#console {
+  margin: 9px 0 10px;
+}
+
+/**
+ * Tabs.
+ */
+.is-collapse-enabled  .tabs,
+.is-horizontal .tabs {
+  position: relative;
+}
+.is-collapse-enabled .tabs:before,
+.is-horizontal .tabs:before {
+  content: '';
+  display: block;
+  background-color: #A6A6A6;
+  height: 1px;
+  position: absolute;
+  bottom: 0;
+  left: 0;
+  z-index: 10;
+  right: 0;
+}
+
+/* Span the full width of the viewport */
+.branding__inner .is-horizontal .tabs:before,
+.branding__inner .is-collapse-enabled .tabs:before {
+  left: -2.5em;
+  right: -2.5em;
+}
+
+/**
+ * Tab
+ *
+ * 1. Required by some elements such as <button>
+ * 2. Fixed height needed to ensure alignment with absolutely-positioned
+ *    active tab.
+ */
+.tabs__tab {
+  position: relative;
+  display: block;
+  overflow: hidden;
+  -webkit-box-sizing: border-box;
+  -moz-box-sizing: border-box;
+  box-sizing: border-box;
+  margin: -1px 0 0;
+  padding: 9px 2em 7px 1em;
+  width: 100%;  /* 1 */
+  border: 1px solid #bfbfbf;
+  background-color: rgba(242, 242, 240, 0.7);
+  color: #0074bd;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+.tabs__tab:hover {
+  color: #008ee6;
+  background-color: #fafaf7;
+}
+li.tabs__tab {
+  padding: 0;
+}
+li.tabs__tab a {
+  padding: 9px 2em 7px 1em;
+}
+.tabs a:hover,
+.tabs a:focus {
+  text-decoration: none;
+}
+
+/* Primary tabs */
+.tabs.primary {
+  clear: both;
+  margin: 16px 0 0;
+  margin: 1rem 0 0;
+}
+.tabs.primary .tabs__tab.active {
+  z-index: 15;
+  border-color: #a6a6a6;
+  border-radius: 4px 0 0 0;
+  background-color: #ffffff;
+  color: #004f80;
+}
+.tabs.primary a {
+  background: none;
+}
+.tabs.primary a:focus {
+  color: #008ee6;
+  background-color: #fafaf7;
+  text-decoration: underline;
+}
+.tabs.primary .active a:focus {
+  background: none;
+  text-decoration: underline;
+}
+
+/* Only add the arrow if there's space */
+@media screen and (min-width:18.75em) { /* 300px */
+  .tabs.primary a {
+    background: url(../../misc/icons/0074bd/chevron-right.svg) 99% center no-repeat;
+  }
+  .no-svg .tabs.primary a {
+    background-image: url(../../misc/icons/0074bd/chevron-right.png);
+  }
+  [dir="rtl"] .tabs.primary a {
+    background: url(../../misc/icons/0074bd/chevron-left.svg) 1% center no-repeat;
+  }
+  [dir="rtl"] .no-svg .tabs.primary a {
+    background-image: url(../../misc/icons/0074bd/chevron-left.png);
+  }
+  .tabs.primary .tabs__tab.active a {
+    background-image: none;
+  }
+}
+.tabs__trigger {
+  display: none;
+}
+
+/* JS dependent styling */
+ .is-collapse-enabled .tabs__trigger {
+  -webkit-box-sizing: content-box;
+  -moz-box-sizing: content-box;
+  box-sizing: content-box;
+  display: block;
+  position: absolute;
+  z-index: 10;
+  right: 0;
+  top: 2px;
+  left: auto;
+  width: 25%;
+  padding-right: 4px;
+  padding-left: 4px;
+  border-left: 0;
+  border-radius: 0 4px 0 0;
+  font-family: Arial, sans-serif;
+  font-size: 1.25em;
+  letter-spacing: 0.1em;
+  text-align: center;
+  outline: 0;
+}
+[dir="rtl"] .is-collapse-enabled .tabs__trigger {
+  border-right: 0;
+  border-left: 1px solid #bfbfbf;
+  border-radius: 4px 0 0 0;
+  right: auto;
+  left: 0;
+  top: 11px;
+}
+.is-collapse-enabled .tabs {
+  padding-top: 38px;
+  max-height: 0;
+}
+.tabs.is-open {
+  max-height: 999em;
+  padding-bottom:16px;
+  padding-bottom: 1rem;
+}
+.is-collapse-enabled .tabs__tab.active {
+  position: absolute;
+  top: 2px;
+  left: 0;
+  width: 75%;
+  border-bottom: 0;
+}
+[dir="rtl"] .is-collapse-enabled .tabs__tab.active {
+  left: auto;
+  right: 0;
+}
+.is-collapse-enabled .tabs.primary a.active:before {
+  content: none;
+}
+.is-open .tabs__tab.active {
+  border-color: #a6a6a6;
+  background-color: #ffffff;
+  color: #004f80;
+  border-bottom: 1px solid #a6a6a6;
+}
+
+/* Styles for the horizontal state always take priority */
+.is-horizontal .tabs {
+  max-height: none !important;
+  padding-top: 0 !important;
+  overflow: visible;
+}
+.is-horizontal .tabs__tab {
+  float: left;
+  height: auto;
+  width: auto;
+  margin: 0 0 -1px;
+  text-align: center;
+  border-bottom-color: #a6a6a6;
+}
+[dir="rtl"] .is-horizontal .tabs__tab {
+  float: right;
+}
+.is-horizontal .tabs__tab + .tabs__tab {
+  margin-left: -1px;
+}
+.is-horizontal .tabs.primary .tabs__tab:first-child {
+  border-radius: 4px 0 0 0;
+}
+[dir="rtl"] .is-horizontal .tabs.primary .tabs__tab:first-child {
+  border-radius: 0 4px 0 0;
+}
+.is-horizontal .tabs.primary .tabs__tab:last-child {
+  border-radius: 0 4px 0 0;
+}
+[dir="rtl"] .is-horizontal .tabs.primary .tabs__tab:last-child {
+  border-radius: 4px 0 0 0;
+}
+
+/* Override the states above */
+.is-horizontal .tabs__tab.active,
+.is-horizontal .tabs.primary .tabs__tab.active,
+[dir="rtl"] .is-horizontal .tabs.primary .tabs__tab.active {
+  border-radius: 4px 4px 0 0;
+  position: relative;
+  width: auto;
+  top: 0;
+  border-bottom: 0;
+  margin: 0 -4px;
+}
+[dir="rtl"] .is-horizontal .tabs__tab.active {
+  margin: 0 -6px;
+}
+.is-horizontal .tabs.primary a {
+  background-image: none;
+  padding: 7px 2em 7px 2em;
+}
+.is-horizontal .tabs__trigger {
+  display: none;
+}
+
+/* Secondary tabs */
+.tabs.secondary {
+  display: block;
+  margin-top: 16px;
+  margin-top: 1rem;
+}
+.tabs.secondary .tabs__tab {
+  display: block;
+  padding: 5px 15px 5px 16px;
+  margin-left: -1px;
+  color: #0074bd;
+  -webkit-transition: border-color 0.2s, background-color 0.2s;
+  -moz-transition: border-color 0.2s, background-color 0.2s;
+  transition: border-color 0.2s, background-color 0.2s;
+}
+.tabs.secondary .tabs__tab + .tabs__tab {
+  border-top: 1px solid #d9d8d4;
+}
+.tabs.secondary .tabs__tab.active {
+  color: #004f80;
+  border-left: 2px solid #004f80;
+  padding-left: 15px;
+}
+.tabs.secondary .tabs__tab:hover {
+  color: #008ee6;
+  border-left: 2px solid #008ee6;
+  padding-left: 15px;
+}
+.tabs.secondary a {
+  background-color: transparent;
+  padding: 7px 13px 5px;
+  text-decoration: none;
+}
+.tabs.secondary .active a {
+  color: #004f80;
+}
+.tabs.secondary a:focus {
+  text-decoration: underline;
+}
+
+/* Styles for the horizontal state */
+.is-horizontal .tabs.secondary .tabs__tab {
+  background: none;
+  float: left;
+  position: relative;
+  top: 0;
+  z-index: 15;
+  margin-left: 1em;
+  margin-right: 1em;
+  border-bottom: 2px solid transparent;
+  border-left: 1px solid transparent;
+  border-right-color: transparent;
+  border-top: 0;
+  padding: 0;
+}
+.is-horizontal .tabs.secondary .tabs__tab.active {
+  border-bottom-color: #004f80;
+}
+.is-horizontal .tabs.secondary .tabs__tab:hover {
+  border-bottom-color: #008ee6;
+}
+
+/**
+ * Page layout.
+ */
+#page {
+  background: #fff;
+  color: #333;
+  margin-left: 0.8125em;
+  margin-right: 0.8125em;
+  position: relative;
+}
+@media screen and (min-width:28.125em) { /* 450px */
+  #page {
+    margin-left: 1.25em;
+    margin-right: 1.25em;
+  }
+}
+@media screen and (min-width:45em) { /* 720px */
+  #page {
+    margin-left: 2.5em;
+    margin-right: 2.5em;
+  }
+}
+ul.links li,
+ul.inline li {
+  padding-right: 1em; /* LTR */
+}
+[dir="rtl"] ul.links li,
+[dir="rtl"] ul.inline li {
+  padding-left: 1em;
+}
+ul.inline li {
+  display: inline;
+}
+ul.admin-list {
+  margin: 0;
+  padding: 0;
+}
+.admin-list li {
+  position: relative;
+  border-top: 1px solid #bfbfbf;
+  margin: 0;
+  list-style-type: none;
+  list-style-image: none;
+  padding: 0;
+}
+.admin-list.compact li {
+  border: none;
+}
+.admin-list li a {
+  background: url(../../misc/icons/bebebe/chevron-disc-right.svg) no-repeat 1px 16px; /* LTR */
+  display: block;
+  padding: 14px 15px 14px 25px; /* LTR */
+  min-height: 0;
+}
+.no-svg .admin-list li a {
+  background-image: url(../../misc/icons/bebebe/chevron-disc-right.png); /* LTR */
+}
+[dir="rtl"] .admin-list li a {
+  background: url(../../misc/icons/bebebe/chevron-disc-left.svg) no-repeat right 16px;
+  padding-right: 25px;
+  padding-left: 15px;
+}
+.no-svg [dir="rtl"] .admin-list li a {
+  background-image: url(../../misc/icons/bebebe/chevron-disc-left.png);
+}
+.admin-list.compact li a {
+  background-image:  none;
+  padding: 2px 0;
+}
+.admin-list li a:hover,
+.admin-list li a:focus,
+.admin-list li a:active {
+  text-decoration: none;
+}
+.admin-list li a .label {
+  font-size: 1.0769em;
+}
+.admin-list li a:hover .label,
+.admin-list li a:focus .label,
+.admin-list li a:active .label {
+  text-decoration: underline;
+}
+div.submitted {
+  color: #898989;
+}
+
+/**
+ * Pagination.
+ * The item-list CSS uses quite strong selectors, we have to match them here to
+ * override.
+ */
+.item-list .pager li {
+  display: inline-block;
+  color: #8c8c8c;
+  font-size: 1.08em;
+  padding: 0 0.6em;
+  margin: 0;
+}
+.item-list .pager a,
+.item-list .pager .pager-current {
+  border-bottom: 2px solid transparent;
+  line-height: 1.55em;
+  padding: 0 5px;
+  text-decoration: none;
+  -webkit-transition: border-bottom-color 0.2s;
+  -moz-transition: border-bottom-color 0.2s;
+  transition: border-bottom-color 0.2s;
+  font-weight: 600;
+  -webkit-font-smoothing: antialiased;
+}
+.item-list .pager a {
+  padding-bottom: 3px;
+}
+.item-list .pager .pager-current {
+  border-bottom-width: 3px;
+  border-bottom-color: #2a678c;
+  color: #2a678c;
+  margin: 0 5px;
+  font-weight: 700;
+}
+.item-list .pager a:focus,
+.item-list .pager a:hover {
+  border-bottom-color: #3395d2;
+  color: #3395d2;
+}
+.item-list .pager-next a,
+.item-list .pager-last a,
+.item-list .pager-first a,
+.item-list .pager-previous a {
+  border-bottom-width: 0;
+  color: #2a678c;
+  font-weight: 600;
+}
+
+/**
+ * Tables.
+ */
+table {
+  width: 100%;
+  margin: 0 0 10px;
+  font-size: 0.923em;
+}
+caption {
+  text-align: left; /* LTR */
+}
+[dir="rtl"] caption {
+  text-align: right;
+}
+th {
+  padding: 10px 12px;
+  background: #f5f5f2;
+  border: solid #bfbfba;
+  border-width: 1px 0;
+  color: #333;
+  text-align: left; /* LTR */
+  text-transform: uppercase;
+}
+[dir="rtl"] th {
+  text-align: right;
+}
+tr {
+  border-bottom: 1px solid #e6e4df;
+  padding: 0.1em 0.6em;
+}
+thead > tr {
+  border-bottom: 1px solid #000;
+}
+tbody tr:hover {
+  background: #f7fcff;
+}
+td,
+th {
+  vertical-align: top;
+}
+td {
+  padding: 10px 12px;
+  text-align: left; /* LTR */
+}
+[dir="rtl"] td {
+  text-align: right;
+}
+th > a {
+  position: relative;
+  display: block;
+}
+
+/* 1. Must match negative bottom padding of the parent <th> */
+th > a:after {
+  content: '';
+  display: block;
+  position: absolute;
+  top: 0;
+  bottom: -10px; /* 1. */
+  left: 0;
+  right: 0;
+  border-bottom: 2px solid transparent;
+  transition: all 0.1s;
+}
+th.active > a {
+  color: #004875;
+}
+th.active img {
+  position: absolute;
+  right: 0; /* LTR */
+  top: 50%;
+}
+[dir="rtl"] th.active img {
+  right: auto;
+  left: 0;
+}
+th.active > a:after {
+  border-bottom-color: #004875;
+}
+th > a:focus,
+th > a:hover,
+th.active > a:focus,
+th.active > a:hover {
+  color: #008ee6;
+  text-decoration: none;
+}
+th > a:focus:after,
+th > a:hover:after,
+th.active > a:focus:after,
+th.active > a:hover:after {
+  border-bottom-color: #008ee6;
+}
+td .item-list ul {
+  margin: 0;
+}
+td.active {
+  background: none;
+}
+
+/* Force browsers to calculate the width of a 'select all' TH element. */
+th.select-all {
+  width: 1px;
+}
+
+/**
+ * Captions.
+ */
+.caption {
+  margin-bottom: 1.2em;
+}
+
+/**
+ * Status report table.
+ */
+table.system-status-report tr {
+  border-top: 1px solid #ccc;
+  border-left: 1px solid #bebfb9;
+  border-right: 1px solid #bebfb9;
+  border-bottom: inherit;
+}
+table.system-status-report tr:first-child {
+  border-top: 1px solid #bebfb9;
+}
+table.system-status-report tr:last-child {
+  border-bottom: 1px solid #bebfb9;
+}
+
+table.system-status-report tr.ok {
+  color: #255b1e;
+  background-color: #e5ffe2;
+}
+table.system-status-report tr.warning {
+  color: #840;
+  background-color: #fffce5;
+}
+table.system-status-report tr.error {
+  color: #8c2e0b;
+  background-color: #fef5f1;
+}
+
+/**
+ * Responsive tables.
+ */
+@media screen and (max-width: 37.5em) { /* 600px */
+  th.priority-low,
+  td.priority-low,
+  th.priority-medium,
+  td.priority-medium {
+    display: none;
+  }
+}
+@media screen and (max-width: 60em) { /* 920px */
+  th.priority-low,
+  td.priority-low {
+    display: none;
+  }
+}
+
+/**
+ * Collapsible details.
+ */
+details {
+  line-height: 1.295em;
+}
+details summary {
+  padding-top: 0.5em;
+  padding-bottom: 0.5em;
+}
+
+/**
+ * Form elements.
+ */
+form {
+  margin: 0;
+  padding: 0;
+}
+fieldset {
+  margin: 1em 0;
+}
+.fieldgroup {
+  min-width: 0;
+}
+@-moz-document url-prefix() {
+  .fieldgroup {
+    display: table-cell;
+  }
+}
+.form-item {
+  margin: 1em 0;
+}
+.form-type-checkbox {
+  padding: 0;
+}
+label {
+  display: block;
+  margin: 0;
+  padding: 0;
+  font-weight: bold;
+}
+.form-item label.option {
+  font-size: 0.923em;
+  text-transform: none;
+}
+.form-item label.option input {
+  vertical-align: middle;
+}
+.form-disabled input.form-text,
+.form-disabled input.form-tel,
+.form-disabled input.form-email,
+.form-disabled input.form-url,
+.form-disabled input.form-search,
+.form-disabled input.form-number,
+.form-disabled input.form-color,
+.form-disabled input.form-file,
+.form-disabled textarea.form-textarea,
+.form-disabled select.form-select {
+  background-color: #eee;
+  color: #777;
+}
+
+/* Filter */
+.filter-wrapper {
+  font-size: 0.923em;
+}
+ul.tips,
+div.description,
+.form-item div.description {
+  margin: 5px 0;
+  line-height: 1.231em;
+  font-size: 0.923em;
+  color: #555;
+}
+ul.tips li {
+  margin: 0.25em 0 0.25em 1.5em; /* LTR */
+}
+[dir="rtl"] ul.tips li {
+  margin: 0.25em 1.5em 0.25em 0;
+}
+body div.form-type-radio div.description,
+body div.form-type-checkbox div.description {
+  margin-left: 1.5em; /* LTR */
+}
+[dir="rtl"] body div.form-type-radio div.description,
+[dir="rtl"] body div.form-type-checkbox div.description {
+  margin-left: 0;
+  margin-right: 1.5em;
+}
+input.form-autocomplete,
+input.form-text,
+input.form-tel,
+input.form-email,
+input.form-url,
+input.form-search,
+input.form-number,
+input.form-color,
+input.form-file,
+textarea.form-textarea,
+select.form-select {
+  -webkit-box-sizing: border-box;
+  -moz-box-sizing:    border-box;
+  box-sizing:         border-box;
+  padding: 2px;
+  max-width: 100%;
+  border: 1px solid #ccc;
+  border-top-color: #999;
+  background: #fff;
+  color: #333;
+  -webkit-transition: border linear 0.2s, box-shadow linear 0.2s;
+  -moz-transition: border linear 0.2s, box-shadow linear 0.2s;
+  transition: border linear 0.2s, box-shadow linear 0.2s;
+}
+input.form-text:focus,
+input.form-tel:focus,
+input.form-email:focus,
+input.form-url:focus,
+input.form-search:focus,
+input.form-number:focus,
+input.form-color:focus,
+input.form-file:focus,
+textarea.form-textarea:focus,
+select.form-select:focus {
+  color: #000;
+  border-color: rgba(0, 116, 189, 0.8);
+  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1), 0 0 8px rgba(220, 220, 220, 0.4);
+  outline-color: rgba(0, 116, 189, 0.5);
+}
+
+/**
+ * Improve spacing of cancel link.
+ */
+#edit-cancel {
+  margin-left: 10px; /* LTR */
+}
+[dir="rtl"] #edit-cancel {
+  margin-left: 0;
+  margin-right: 10px;
+}
+
+/**
+ * Improve form element usability on narrow devices.
+ */
+@media screen and (max-width: 600px) {
+  #page {
+    margin: 0 10px;
+  }
+  input.form-autocomplete,
+  input.form-text,
+  input.form-tel,
+  input.form-email,
+  input.form-url,
+  input.form-search,
+  input.form-number,
+  input.form-color,
+  input.form-file,
+  textarea.form-textarea {
+    width: 100%;
+    font-size: 1.2em;
+    line-height: 1.2em;
+  }
+  input.form-number {
+    width: auto;
+  }
+  .form-actions input,
+  .form-wrapper input[type="submit"] {
+    float: none;
+    margin-left: 0;
+    margin-right: 0;
+    margin-top: 10px;
+    padding-bottom: 6px;
+    width: 100%;
+  }
+  .form-actions input:first-child,
+  .form-wrapper input[type="submit"]:first-child {
+    margin-top: 0;
+  }
+  .exposed-filters .filters,
+  .exposed-filters .form-item label,
+  .exposed-filters .form-select {
+    float: none;
+    margin-bottom: 2px;
+    width: 100%;
+  }
+  details summary {
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+    -webkit-box-sizing: border-box;
+    -moz-box-sizing: border-box;
+    box-sizing: border-box;
+  }
+  #dblog-filter-form .form-actions {
+    float: none;
+    padding: 0;
+  }
+  #edit-cancel {
+    display: block;
+    margin: 10px 0 0 0;
+  }
+}
+
+/* Exceptions */
+#diff-inline-form select,
+div.filter-options select {
+  padding: 0;
+}
+
+/**
+ * System.
+ */
+@media screen and (min-width: 40em) {
+  div.admin .right,
+  div.admin .left {
+    width: 49%;
+    margin: 0;
+  }
+}
+div.admin-panel,
+div.admin-panel .body {
+  padding: 0;
+  clear: left;
+}
+div.admin-panel {
+  margin: 0 0 20px;
+  padding: 9px;
+  background: #f8f8f8;
+  border: 1px solid #ccc;
+}
+div.admin-panel h3 {
+  font-size: 0.923em;
+  text-transform: uppercase;
+  margin: 0;
+  padding-bottom: 9px;
+}
+
+/* admin/appearance */
+#system-themes-page h2 {
+  font-weight: normal;
+  text-transform: uppercase;
+}
+.theme-selector h3 {
+  font-weight: normal;
+}
+.theme-default h3 {
+  font-weight: bold;
+}
+
+/* Update options. */
+div.admin-options {
+  background: #f8f8f8;
+  line-height: 30px;
+  height: 30px;
+  padding: 9px;
+  border: 1px solid #ccc;
+  margin: 0 0 10px;
+}
+div.admin-options label {
+  text-transform: uppercase;
+  font: 0.846em/1.875em Lucida Grande, Lucida Sans Unicode, sans-serif;
+}
+div.admin-options label,
+div.admin-options div.form-item {
+  margin-right: 10px; /* LTR */
+  float: left; /* LTR */
+}
+[dir="rtl"] div.admin-options label,
+[dir="rtl"] div.admin-options div.form-item {
+  margin-left: 10px;
+  margin-right: 0;
+  float: right;
+}
+div.admin-options div.form-item {
+  padding: 0;
+  border: 0;
+}
+
+/* Update status */
+.versions table.version {
+  border: none;
+}
+
+/* Field UI */
+
+#field-display-overview input.field-plugin-settings-edit {
+  margin: 0;
+  padding: 1px 8px;
+}
+#field-display-overview tr.field-plugin-settings-changed {
+  background: #ffffbb;
+}
+#field-display-overview tr.drag {
+  background: #ffee77;
+}
+#field-display-overview tr.field-plugin-settings-editing {
+  background: #d5e9f2;
+}
+#field-display-overview .field-plugin-settings-edit-form .form-item {
+  margin: 10px 0;
+}
+#field-display-overview .field-plugin-settings-edit-form .form-submit {
+  margin-bottom: 0;
+}
+
+/* Modules page */
+#system-modules fieldset {
+  border: 0;
+  border-top: 1px solid #ccc;
+}
+#system-modules .fieldset-wrapper {
+  padding: 0;
+}
+#system-modules table,
+#locale-translation-status-form table {
+  border: 0;
+}
+#system-modules tr.even,
+#system-modules tr.odd,
+#locale-translation-status-form tr.even,
+#locale-translation-status-form tr.odd {
+  background: #f3f4ee;
+  border: 0;
+  border-bottom: 10px solid #fff;
+}
+#system-modules tr td:last-child,
+#locale-translation-status-form tr td:last-child {
+  border: 0;
+}
+#system-modules table th,
+#locale-translation-status-form table th {
+  border: 0;
+  border-bottom: 10px solid #fff;
+}
+#system-modules .sticky-header th,
+#locale-translation-status-form .sticky-header th {
+  border: 0;
+}
+/* Recent content block */
+#block-node-recent table,
+#block-node-recent tr {
+  border: none;
+}
+#block-node-recent .more-link {
+  padding: 0 5px 5px 0; /* LTR */
+}
+[dir="rtl"] #block-node-recent .more-link {
+  padding: 0 0 5px 5px;
+}
+
+/**
+ * Views styling
+ */
+
+/* @group Forms */
+
+/**
+ * Seven positions the summary absolutely, but does not have a way to ignore
+ * details without a summary so we make one up.
+ *
+ * @todo Neither a fieldset without legend nor a details without summary is
+ *   valid HTML markup in any way. Refactor Views UI to not produce such invalid
+ *   markup.
+ */
+details.fieldset-no-legend {
+  padding-top: 0;
+}
+
+/**
+ * Being extra safe here and scoping this to the add view wizard form (where
+ * a layout problem occurs for the Display format details if we don't fix its
+ * padding), but it's probably safe to just let it apply everywhere.
+ */
+#views-ui-add-form details details .details-wrapper {
+  padding-left: 0;
+  padding-right: 0;
+}
+
+.views-display-tab details.box-padding .details-wrapper {
+  padding: 0;
+}
+
+.views-admin .form-item label.option,
+#views-ui-preview-form .form-item label.option {
+  font-size: 1em;
+}
+
+.views-admin input.form-submit,
+.views-ui-dialog input.form-submit,
+.views-admin a.button,
+.views-ui-dialog a.button {
+  margin-bottom: 0;
+  margin-right: 0; /* LTR */
+  margin-top: 0;
+}
+[dir="rtl"] .views-admin input.form-submit,
+[dir="rtl"] .views-ui-dialog input.form-submit,
+[dir="rtl"] .views-admin a.button,
+[dir="rtl"] .views-ui-dialog a.button {
+  margin-left: 0;
+}
+
+/* Override for a button on the edit display screen */
+#edit-displays-preview-controls .form-submit {
+  display: inline-block;
+  margin-right: 1em;
+}
+
+.form-radios > .form-item {
+  margin-top: 3px;
+}
+
+/* @group Dependent options
+ */
+
+/* This is necessary to supercede the Seven .form-item
+ * reset declaration that sets the margin to zero.
+ */
+.form-item-options-expose-required,
+.form-item-options-expose-label,
+.form-item-options-expose-description {
+  margin-left: 1.5em;
+}
+
+.views-admin-dependent .form-item .form-item,
+.views-admin-dependent .form-type-checkboxes,
+.views-admin-dependent .form-type-radios,
+.views-admin-dependent .form-item .form-item,
+.form-item-options-expose-required,
+.form-item-options-expose-label,
+.form-item-options-expose-description {
+  margin-bottom: 6px;
+  margin-top: 6px;
+}
+
+.views-admin-dependent .form-type-radio,
+.views-admin-dependent .form-radios .form-item {
+  margin-bottom: 2px;
+  margin-top: 2px;
+}
+
+/* @end */
+
+/* @group Lists */
+
+.views-admin ul.secondary,
+.views-admin .item-list ul {
+  margin: 0;
+  padding: 0;
+}
+
+.views-displays ul.secondary li a,
+.views-displays ul.secondary li.active a,
+.views-displays ul.secondary li.active a.active {
+  padding: 2px 7px 3px;
+}
+
+.views-displays ul.secondary li a {
+  color: #0074bd;
+}
+
+.views-displays ul.secondary li.active a,
+.views-displays ul.secondary li.active a.active {
+  border: 1px solid transparent;
+}
+
+.views-admin .links li {
+  padding-right: 0; /* LTR */
+}
+[dir="rtl"] .views-admin .links li {
+  padding-left: 0;
+}
+
+.views-admin .button .links li {
+  padding-right: 12px; /* LTR */
+}
+[dir="rtl"] .views-admin .button .links li {
+  padding-left: 12px;
+}
+
+.views-display-top ul.secondary {
+  background-color: transparent;
+  float: left
+}
+
+.views-display-top .secondary .action-list li {
+  float: none;
+  margin: 0;
+}
+
+/* @end */
+
+/* @group Tables */
+
+.views-ui-rearrange-filter-form table td,
+.views-ui-rearrange-filter-form table th {
+  vertical-align: top;
+}
+
+/* @end */
+
+/* @group Attachment details */
+
+#edit-display-settings-title {
+  color: #008BCB;
+}
+
+/* @end */
+
+/* @group Attachment details tabs
+ *
+ * The tabs that switch between sections
+ */
+
+.views-displays .secondary {
+ text-align: left; /* LTR */
+}
+[dir="rtl"] .views-displays .secondary {
+  text-align: right;
+}
+
+.views-admin .icon.add {
+  background-position: center 3px;
+}
+
+.views-displays .secondary a:hover > .icon.add {
+  background-position: center -25px;
+}
+
+.views-displays .secondary .open > a {
+  border-radius: 7px 7px 0 0;
+}
+
+.views-displays .secondary .open > a:hover {
+  background-color: #f1f1f1;
+  color: #008BCB;
+}
+
+.views-displays .secondary .action-list  li:first-child {
+  border-radius: 0 7px 0 0;
+}
+
+.views-displays .secondary .action-list  li:last-child {
+  border-radius: 0 0 7px 7px;
+}
+
+.views-displays .secondary .action-list input.form-submit {
+  color: #008bcb;
+}
+
+/* @end */
+
+/* @group Attachment buckets
+ *
+ * These are the individual "buckets," or boxes, inside the display settings area
+ */
+
+.views-ui-display-tab-bucket h3 {
+  font-size: 12px;
+  text-transform: uppercase;
+}
+
+.views-ui-display-tab-bucket .links {
+  padding: 2px 6px 4px;
+}
+
+.views-ui-display-tab-bucket .links li + li {
+  margin-left: 3px;
+}
+
+/* @end */
+
+/* @group Rearrange filter criteria */
+
+#views-ui-rearrange-filter-form .action-links {
+  margin: 0;
+  padding: 0;
+}
+
+#views-ui-rearrange-filter-form table {
+  border: medium none;
+}
+
+#views-ui-rearrange-filter-form [id^="views-row"] {
+  border: medium none;
+}
+
+#views-ui-rearrange-filter-form tr td:last-child {
+  border-right: medium none;
+}
+
+#views-ui-rearrange-filter-form .filter-group-operator-row {
+  border-left: 1px solid transparent !important;
+  border-right: 1px solid transparent !important;
+}
+
+#views-ui-rearrange-filter-form tr.drag td {
+  background-color: #FFEE77 !important;
+}
+
+#views-ui-rearrange-filter-form tr.drag-previous td {
+  background-color: #FFFFBB !important;
+}
+
+/* @end */
+
+/* @group Live preview elements */
+
+.views-query-info pre {
+  margin-bottom: 0;
+  margin-top: 0;
+}
+
+/* @group Query info table */
+
+.views-query-info table {
+  border-radius: 7px;
+  -webkit-border-horizontal-spacing: 1px;
+  -webkit-border-vertical-spacing: 1px;
+}
+
+.views-query-info table tr td:last-child {
+  /* Fixes a Seven style that bleeds down into this table unnecessarily */
+  border-right: 0 none;
+}
+
+/* @end */
+
+/* @end */
+
+/* @group Add view */
+
+.form-item-page-create,
+.form-item-block-create {
+  margin-top: 13px;
+}
+
+/* @end */
+
+/* @group Modal dialog box
+ *
+ * The contents of the popup dialog on the views edit form.
+ */
+
+.filterable-option .form-item.form-type-checkbox {
+  /* This selector is aggressive because Seven's reset for .form-items is aggressive. */
+  padding-bottom: 4px;
+  padding-left: 4px;
+  padding-top: 4px;
+}
+
+/* @end */
+
+/**
+ * Entity meta settings.
+ */
+.entity-meta {
+  background-color: #ececec;
+  border-bottom: 0;
+  border-left: 1px solid #bfbfbf;
+  border-right: 1px solid #bfbfbf;
+  border-top: 0;
+  box-shadow: inset 0 0 5px rgba(0, 0, 0, .15);
+  margin-top: 0;
+  padding-top: 0;
+}
+.entity-meta-header,
+.entity-meta details {
+  background-color: #f7f7f7;
+  border-top: 1px solid #bfbfbf;
+  border-bottom: 1px solid #bfbfbf;
+}
+.entity-meta-header {
+  padding: 1em 1.5em;
+}
+.entity-meta-header .form-item {
+  margin: .25em 0;
+}
+.entity-meta-header .published {
+  font-size: 1.231em;
+  font-weight: bold;
+  text-shadow: 0 1px 0 #fff;
+}
+.entity-meta-header .changed {
+  font-style: italic; /* As-designed, but really: why is this italic? */
+}
+.entity-meta details {
+  border-left: 0;
+  border-right: 0;
+  border-top: 1px solid #ffffff;
+  margin: 0;
+}
+.entity-meta details[open] {
+  background-color: transparent;
+  background-image: -webkit-linear-gradient(top, rgba(0, 0, 0, .125), transparent 4px);
+  background-image:    -moz-linear-gradient(top, rgba(0, 0, 0, .125), transparent 4px);
+  background-image:      -o-linear-gradient(top, rgba(0, 0, 0, .125), transparent 4px);
+  background-image:         linear-gradient(to bottom, rgba(0, 0, 0, .125), transparent 4px);
+  border-top-width: 0;
+  padding-top: 1px;
+}
+.entity-meta details[open] + [open] {
+  background-image: none;
+  border-top-width: 1px;
+  padding-top: 0;
+}
+.entity-meta details > .details-wrapper {
+  padding-top: 0;
+}
+.entity-meta details > summary {
+  padding: 0.85em 1.25em;
+  text-shadow: 0 1px 0 white;
+}
+.entity-meta details .summary {
+ display: none; /* Hide JS summaries. @todo Rethink summaries. */
+}
+
+/**
+ * Widescreen
+ *
+ * Both of the following media queries must *exactly* match what is in
+ * node.module.css. This is rather crazy.
+ *
+ * @todo Figure out how to reduce media query duplication across files
+ *       and modules. Layout styles only allowed in themes?
+ */
+@media
+  screen and (min-width: 780px),
+  (orientation: landscape) and (min-device-height: 780px) {
+
+  [class*="page-node-add-"] #console,
+  .page-node-edit #console {
+    margin: 0 2em;
+  }
+  [class*="page-node-add-"] .messages,
+  .page-node-edit .messages {
+    margin-top: 1em;
+    margin-bottom: 1em;
+  }
+}
+@media
+  screen and (max-width: 1020px),
+  (orientation: landscape) and (max-device-height: 1020px) {
+
+  .toolbar-vertical .block-list-secondary,
+  .toolbar-vertical .layout-region-node-secondary {
+    margin-bottom: 0;
+    padding-bottom: 0;
+    display: block;
+  }
+  .toolbar-vertical .layout-node-form:after {
+    display: none;
+  }
+}
+
+/* Delete button */
+.form-actions .button-danger {
+  color: #c72100;
+  background: none;
+  border: none;
+  float: right;
+  margin-right: 0;
+  margin-left: 0;
+  padding-right: 0;
+  padding-left: 0;
+}
+.form-actions .button-danger:hover,
+.form-actions .button-danger:focus {
+  color: #ff2a00;
+  background: none;
+  border: none;
+  text-decoration: underline;
+}
+.form-actions .button-danger:active {
+  color: #ff2a00;
+  background: none;
+  border: none;
+  text-decoration: underline;
+}
diff --git a/core/themes/seven/css/vertical-tabs.css b/core/themes/seven/css/vertical-tabs.css
new file mode 100644
index 0000000..325a3af
--- /dev/null
+++ b/core/themes/seven/css/vertical-tabs.css
@@ -0,0 +1,109 @@
+/**
+ * Override of misc/vertical-tabs.css.
+ */
+.vertical-tabs {
+  position: relative;
+  overflow: hidden;
+  margin: 10px 0;
+  border: 1px solid #bdbdbd;
+  border-radius: 4px;
+  background: #e6e5e1;
+}
+.vertical-tabs-list {
+  float: left; /* LTR */
+  width: 240px;
+  margin: 0 -100% -1px 0; /* LTR */
+  padding: 0;
+  border-bottom: 1px solid #ccc;
+  line-height: 1;
+}
+[dir="rtl"] .vertical-tabs-list {
+  float: right;
+  margin: 0 0 -1px -100%;
+}
+.vertical-tab-button {
+  position: relative;
+  margin: 0;
+  list-style: none;
+  list-style-image: none;
+}
+.vertical-tab-button.selected {
+  z-index: 1;
+  overflow-x: hidden;
+  width: 100%;
+  border-right: 1px solid #fcfcfa; /* LTR */
+  box-shadow: 0 5px 5px -5px hsla(0, 0%, 0%, 0.3);
+}
+[dir="rtl"] .vertical-tab-button.selected {
+  border-left: 1px solid #fcfcfa;
+  border-right: none;
+}
+.vertical-tab-button:focus,
+.vertical-tab-button:active {
+  z-index: 2;
+}
+.vertical-tab-button a {
+  display: block;
+  padding: 10px 15px 15px;
+  border-bottom: 1px solid #b3b2ad;
+  background-color: #f2f2f0;
+  text-shadow: 0 1px hsla(0, 0%, 100%, 0.6);
+  text-decoration: none;
+}
+.vertical-tab-button:last-child a {
+  border-bottom: 0;
+}
+.vertical-tab-button.selected a,
+.vertical-tab-button a:hover,
+.vertical-tab-button a:focus {
+  background: #fcfcfa;
+  text-shadow: none;
+  text-decoration: none;
+}
+.vertical-tab-button.selected a {
+  border-bottom-color: #b3b2ad;
+  color: #004f80;
+}
+.vertical-tab-button.selected a:hover,
+.vertical-tab-button.selected a:focus {
+  color: #007ecc;
+}
+[data-vertical-tabs-panes] {
+  background-color: #fcfcfa;
+}
+.vertical-tabs-panes {
+  margin: 0 0 0 240px; /* LTR */
+  padding: 10px 15px 10px 15px;
+  border-left: 1px solid #a6a5a1; /* LTR */
+}
+[dir="rtl"] .vertical-tabs-panes {
+  margin: 0 240px 0 0;
+  border-left: none;
+  border-right: 1px solid #a6a5a1;
+}
+.vertical-tabs-panes:after {
+  content: "";
+  display: table;
+  clear: both;
+}
+.vertical-tabs-pane {
+  margin: 0;
+  padding: 0;
+  border: 0;
+  color: #595959;
+}
+.vertical-tab-button strong {
+  font-size: 0.923em;
+}
+.vertical-tab-button .summary {
+  display: block;
+  padding-top: 0.4em;
+  color: #666;
+  font-size: 0.846em;
+}
+.vertical-tab-button.selected a:focus strong {
+  text-decoration: underline;
+}
+.vertical-tabs-pane > summary {
+  display: none;
+}
diff --git a/core/themes/seven/install-page.css b/core/themes/seven/install-page.css
deleted file mode 100644
index 5c3bf83..0000000
--- a/core/themes/seven/install-page.css
+++ /dev/null
@@ -1,49 +0,0 @@
-/**
- * @file
- * Installation styling.
- *
- * Unfortunately we have to make our styling quite strong, to override the
- * .in-maintenance styling.
- */
-.install-background {
-  background-color: #1275b2;
-  background-image:
-    url('images/noise-low.png'),
-    -webkit-radial-gradient(hsl(203, 80%, 45%), hsl(203, 80%, 32%));
-  background-image:
-    url('images/noise-low.png'),
-    -moz-radial-gradient(hsl(203, 80%, 45%), hsl(203, 80%, 32%));
-  background-image:
-    url('images/noise-low.png'),
-    -o-radial-gradient(hsl(203, 80%, 45%), hsl(203, 80%, 32%));
-  background-image:
-    url('images/noise-low.png'),
-    radial-gradient(hsl(203, 80%, 45%), hsl(203, 80%, 32%));
-  background-repeat: repeat;
-  background-position: left top, 50% 50%;
-  min-height: 100%;
-}
-
-/**
- * Password widget
- */
-.install-page .password-parent,
-.install-page .confirm-parent {
-  width: auto;
-}
-.install-page .form-item .password-suggestions {
-  float: none;
-  width: auto;
-}
-@media all and (max-width: 1010px) and (min-width: 48em) {
-  .install-page .password-strength,
-  .install-page .confirm-parent,
-  .install-page .password-confirm {
-    float: none;
-    width: auto;
-  }
-  input.password-confirm,
-  input.password-field {
-    float: none;
-  }
-}
diff --git a/core/themes/seven/jquery.ui.theme.css b/core/themes/seven/jquery.ui.theme.css
deleted file mode 100644
index 17dc06a..0000000
--- a/core/themes/seven/jquery.ui.theme.css
+++ /dev/null
@@ -1,383 +0,0 @@
-/**
- * @file
- * Seven styles for jQuery UI.
- * Overrides /core/assets/vendor/jquery.ui/ui.theme.css.
- */
-
-/**
- * Component containers
- */
-.ui-widget {
-  background: #fff;
-}
-.ui-widget-content {
-  border: solid 1px #ccc;
-}
-
-/**
- * Interaction states
- */
-.ui-state-default,
-.ui-state-hover,
-.ui-state-focus,
-.ui-state-active {
-  outline: 0;
-}
-.ui-state-active {
-  font-weight: bold;
-}
-
-/**
- * Interaction cues
- */
-.ui-state-highlight,
-.ui-widget-content .ui-state-highlight {
-  color: #840;
-  background: #fe6;
-  border: solid 1px #ed5;
-}
-.ui-state-error,
-.ui-widget-content .ui-state-error {
-  color: #fff;
-  background: #e63;
-  border-color: #d52;
-}
-.ui-state-disabled,
-.ui-widget-content .ui-state-disabled {
-  opacity: .35;
-  filter: Alpha(Opacity=35);
-}
-.ui-priority-secondary,
-.ui-widget-content .ui-priority-secondary {
-  opacity: .7;
-  filter: Alpha(Opacity=70);
-}
-
-/**
- * Icons
- */
-/* states and images */
-.ui-icon {
-  display: block;
-  text-indent: -99999px;
-  width: 16px;
-  height: 16px;
-  overflow: hidden;
-  background-repeat: no-repeat;
-  background-image: url(images/ui-icons-222222-256x240.png);
-}
-.ui-widget-content .ui-icon,
-.ui-widget-header .ui-icon {
-  background-image: url(images/ui-icons-222222-256x240.png);
-}
-.ui-state-default .ui-icon {
-  background-image: url(images/ui-icons-888888-256x240.png);
-}
-.ui-state-hover .ui-icon,
-.ui-state-focus .ui-icon,
-.ui-state-active .ui-icon {
-  background-image: url(images/ui-icons-454545-256x240.png);
-}
-.ui-state-highlight .ui-icon {
-  background-image: url(images/ui-icons-800000-256x240.png);
-}
-.ui-state-error .ui-icon,
-.ui-state-error-text .ui-icon {
-  background-image: url(images/ui-icons-ffffff-256x240.png);
-}
-.ui-widget p .ui-icon {
-  margin: 2px 3px 0 0;
-}
-
-/* positioning */
-.ui-icon-carat-1-ne { background-position: -16px 0; }
-.ui-icon-carat-1-e { background-position: -32px 0; }
-.ui-icon-carat-1-se { background-position: -48px 0; }
-.ui-icon-carat-1-s { background-position: -64px 0; }
-.ui-icon-carat-1-sw { background-position: -80px 0; }
-.ui-icon-carat-1-w { background-position: -96px 0; }
-.ui-icon-carat-1-nw { background-position: -112px 0; }
-.ui-icon-carat-2-n-s { background-position: -128px 0; }
-.ui-icon-carat-2-e-w { background-position: -144px 0; }
-.ui-icon-triangle-1-n { background-position: 0 -16px; }
-.ui-icon-triangle-1-ne { background-position: -16px -16px; }
-.ui-icon-triangle-1-e { background-position: -32px -16px; }
-.ui-icon-triangle-1-se { background-position: -48px -16px; }
-.ui-icon-triangle-1-s { background-position: -64px -16px; }
-.ui-icon-triangle-1-sw { background-position: -80px -16px; }
-.ui-icon-triangle-1-w { background-position: -96px -16px; }
-.ui-icon-triangle-1-nw { background-position: -112px -16px; }
-.ui-icon-triangle-2-n-s { background-position: -128px -16px; }
-.ui-icon-triangle-2-e-w { background-position: -144px -16px; }
-.ui-icon-arrow-1-n { background-position: 0 -32px; }
-.ui-icon-arrow-1-ne { background-position: -16px -32px; }
-.ui-icon-arrow-1-e { background-position: -32px -32px; }
-.ui-icon-arrow-1-se { background-position: -48px -32px; }
-.ui-icon-arrow-1-s { background-position: -64px -32px; }
-.ui-icon-arrow-1-sw { background-position: -80px -32px; }
-.ui-icon-arrow-1-w { background-position: -96px -32px; }
-.ui-icon-arrow-1-nw { background-position: -112px -32px; }
-.ui-icon-arrow-2-n-s { background-position: -128px -32px; }
-.ui-icon-arrow-2-ne-sw { background-position: -144px -32px; }
-.ui-icon-arrow-2-e-w { background-position: -160px -32px; }
-.ui-icon-arrow-2-se-nw { background-position: -176px -32px; }
-.ui-icon-arrowstop-1-n { background-position: -192px -32px; }
-.ui-icon-arrowstop-1-e { background-position: -208px -32px; }
-.ui-icon-arrowstop-1-s { background-position: -224px -32px; }
-.ui-icon-arrowstop-1-w { background-position: -240px -32px; }
-.ui-icon-arrowthick-1-n { background-position: 0 -48px; }
-.ui-icon-arrowthick-1-ne { background-position: -16px -48px; }
-.ui-icon-arrowthick-1-e { background-position: -32px -48px; }
-.ui-icon-arrowthick-1-se { background-position: -48px -48px; }
-.ui-icon-arrowthick-1-s { background-position: -64px -48px; }
-.ui-icon-arrowthick-1-sw { background-position: -80px -48px; }
-.ui-icon-arrowthick-1-w { background-position: -96px -48px; }
-.ui-icon-arrowthick-1-nw { background-position: -112px -48px; }
-.ui-icon-arrowthick-2-n-s { background-position: -128px -48px; }
-.ui-icon-arrowthick-2-ne-sw { background-position: -144px -48px; }
-.ui-icon-arrowthick-2-e-w { background-position: -160px -48px; }
-.ui-icon-arrowthick-2-se-nw { background-position: -176px -48px; }
-.ui-icon-arrowthickstop-1-n { background-position: -192px -48px; }
-.ui-icon-arrowthickstop-1-e { background-position: -208px -48px; }
-.ui-icon-arrowthickstop-1-s { background-position: -224px -48px; }
-.ui-icon-arrowthickstop-1-w { background-position: -240px -48px; }
-.ui-icon-arrowreturnthick-1-w { background-position: 0 -64px; }
-.ui-icon-arrowreturnthick-1-n { background-position: -16px -64px; }
-.ui-icon-arrowreturnthick-1-e { background-position: -32px -64px; }
-.ui-icon-arrowreturnthick-1-s { background-position: -48px -64px; }
-.ui-icon-arrowreturn-1-w { background-position: -64px -64px; }
-.ui-icon-arrowreturn-1-n { background-position: -80px -64px; }
-.ui-icon-arrowreturn-1-e { background-position: -96px -64px; }
-.ui-icon-arrowreturn-1-s { background-position: -112px -64px; }
-.ui-icon-arrowrefresh-1-w { background-position: -128px -64px; }
-.ui-icon-arrowrefresh-1-n { background-position: -144px -64px; }
-.ui-icon-arrowrefresh-1-e { background-position: -160px -64px; }
-.ui-icon-arrowrefresh-1-s { background-position: -176px -64px; }
-.ui-icon-arrow-4 { background-position: 0 -80px; }
-.ui-icon-arrow-4-diag { background-position: -16px -80px; }
-.ui-icon-extlink { background-position: -32px -80px; }
-.ui-icon-newwin { background-position: -48px -80px; }
-.ui-icon-refresh { background-position: -64px -80px; }
-.ui-icon-shuffle { background-position: -80px -80px; }
-.ui-icon-transfer-e-w { background-position: -96px -80px; }
-.ui-icon-transferthick-e-w { background-position: -112px -80px; }
-.ui-icon-folder-collapsed { background-position: 0 -96px; }
-.ui-icon-folder-open { background-position: -16px -96px; }
-.ui-icon-document { background-position: -32px -96px; }
-.ui-icon-document-b { background-position: -48px -96px; }
-.ui-icon-note { background-position: -64px -96px; }
-.ui-icon-mail-closed { background-position: -80px -96px; }
-.ui-icon-mail-open { background-position: -96px -96px; }
-.ui-icon-suitcase { background-position: -112px -96px; }
-.ui-icon-comment { background-position: -128px -96px; }
-.ui-icon-person { background-position: -144px -96px; }
-.ui-icon-print { background-position: -160px -96px; }
-.ui-icon-trash { background-position: -176px -96px; }
-.ui-icon-locked { background-position: -192px -96px; }
-.ui-icon-unlocked { background-position: -208px -96px; }
-.ui-icon-bookmark { background-position: -224px -96px; }
-.ui-icon-tag { background-position: -240px -96px; }
-.ui-icon-home { background-position: 0 -112px; }
-.ui-icon-flag { background-position: -16px -112px; }
-.ui-icon-calendar { background-position: -32px -112px; }
-.ui-icon-cart { background-position: -48px -112px; }
-.ui-icon-pencil { background-position: -64px -112px; }
-.ui-icon-clock { background-position: -80px -112px; }
-.ui-icon-disk { background-position: -96px -112px; }
-.ui-icon-calculator { background-position: -112px -112px; }
-.ui-icon-zoomin { background-position: -128px -112px; }
-.ui-icon-zoomout { background-position: -144px -112px; }
-.ui-icon-search { background-position: -160px -112px; }
-.ui-icon-wrench { background-position: -176px -112px; }
-.ui-icon-gear { background-position: -192px -112px; }
-.ui-icon-heart { background-position: -208px -112px; }
-.ui-icon-star { background-position: -224px -112px; }
-.ui-icon-link { background-position: -240px -112px; }
-.ui-icon-cancel { background-position: 0 -128px; }
-.ui-icon-plus { background-position: -16px -128px; }
-.ui-icon-plusthick { background-position: -32px -128px; }
-.ui-icon-minus { background-position: -48px -128px; }
-.ui-icon-minusthick { background-position: -64px -128px; }
-.ui-icon-close { background-position: -80px -128px; }
-.ui-icon-closethick { background-position: -96px -128px; }
-.ui-icon-key { background-position: -112px -128px; }
-.ui-icon-lightbulb { background-position: -128px -128px; }
-.ui-icon-scissors { background-position: -144px -128px; }
-.ui-icon-clipboard { background-position: -160px -128px; }
-.ui-icon-copy { background-position: -176px -128px; }
-.ui-icon-contact { background-position: -192px -128px; }
-.ui-icon-image { background-position: -208px -128px; }
-.ui-icon-video { background-position: -224px -128px; }
-.ui-icon-script { background-position: -240px -128px; }
-.ui-icon-alert { background-position: 0 -144px; }
-.ui-icon-info { background-position: -16px -144px; }
-.ui-icon-notice { background-position: -32px -144px; }
-.ui-icon-help { background-position: -48px -144px; }
-.ui-icon-check { background-position: -64px -144px; }
-.ui-icon-bullet { background-position: -80px -144px; }
-.ui-icon-radio-off { background-position: -96px -144px; }
-.ui-icon-radio-on { background-position: -112px -144px; }
-.ui-icon-pin-w { background-position: -128px -144px; }
-.ui-icon-pin-s { background-position: -144px -144px; }
-.ui-icon-play { background-position: 0 -160px; }
-.ui-icon-pause { background-position: -16px -160px; }
-.ui-icon-seek-next { background-position: -32px -160px; }
-.ui-icon-seek-prev { background-position: -48px -160px; }
-.ui-icon-seek-end { background-position: -64px -160px; }
-.ui-icon-seek-first { background-position: -80px -160px; }
-.ui-icon-stop { background-position: -96px -160px; }
-.ui-icon-eject { background-position: -112px -160px; }
-.ui-icon-volume-off { background-position: -128px -160px; }
-.ui-icon-volume-on { background-position: -144px -160px; }
-.ui-icon-power { background-position: 0 -176px; }
-.ui-icon-signal-diag { background-position: -16px -176px; }
-.ui-icon-signal { background-position: -32px -176px; }
-.ui-icon-battery-0 { background-position: -48px -176px; }
-.ui-icon-battery-1 { background-position: -64px -176px; }
-.ui-icon-battery-2 { background-position: -80px -176px; }
-.ui-icon-battery-3 { background-position: -96px -176px; }
-.ui-icon-circle-plus { background-position: 0 -192px; }
-.ui-icon-circle-minus { background-position: -16px -192px; }
-.ui-icon-circle-close { background-position: -32px -192px; }
-.ui-icon-circle-triangle-e { background-position: -48px -192px; }
-.ui-icon-circle-triangle-s { background-position: -64px -192px; }
-.ui-icon-circle-triangle-w { background-position: -80px -192px; }
-.ui-icon-circle-triangle-n { background-position: -96px -192px; }
-.ui-icon-circle-arrow-e { background-position: -112px -192px; }
-.ui-icon-circle-arrow-s { background-position: -128px -192px; }
-.ui-icon-circle-arrow-w { background-position: -144px -192px; }
-.ui-icon-circle-arrow-n { background-position: -160px -192px; }
-.ui-icon-circle-zoomin { background-position: -176px -192px; }
-.ui-icon-circle-zoomout { background-position: -192px -192px; }
-.ui-icon-circle-check { background-position: -208px -192px; }
-.ui-icon-circlesmall-plus { background-position: 0 -208px; }
-.ui-icon-circlesmall-minus { background-position: -16px -208px; }
-.ui-icon-circlesmall-close { background-position: -32px -208px; }
-.ui-icon-squaresmall-plus { background-position: -48px -208px; }
-.ui-icon-squaresmall-minus { background-position: -64px -208px; }
-.ui-icon-squaresmall-close { background-position: -80px -208px; }
-.ui-icon-grip-dotted-vertical { background-position: 0 -224px; }
-.ui-icon-grip-dotted-horizontal { background-position: -16px -224px; }
-.ui-icon-grip-solid-vertical { background-position: -32px -224px; }
-.ui-icon-grip-solid-horizontal { background-position: -48px -224px; }
-.ui-icon-gripsmall-diagonal-se { background-position: -64px -224px; }
-.ui-icon-grip-diagonal-se { background-position: -80px -224px; }
-.ui-icon-carat-1-n { background-position: 0 0; }
-
-/**
- * Accordion
- */
-.ui-accordion {
-  border: none;
-}
-.ui-accordion .ui-accordion-header {
-  border: solid 1px #ccc;
-  text-transform: uppercase;
-}
-.ui-accordion h3.ui-accordion-header,
-#block-system-main h3.ui-accordion-header {
-  font-size: 1.1em;
-  margin: 10px 0;
-}
-#block-system-main .ui-accordion h3.ui-state-active,
-.ui-accordion h3.ui-state-active {
-  margin-bottom: 0;
-}
-.ui-accordion .ui-accordion-header a {
-  display: block;
-}
-.ui-accordion .ui-accordion-content {
-  padding: 1em 2.2em;
-  border: solid 1px #ccc;
-  border-top: 0;
-}
-
-/**
- * Tabs
- */
-.ui-tabs {
-  padding: 0;
-}
-.ui-tabs .ui-tabs-nav {
-  padding: 5px 10px 4px;
-  margin: 0;
-  line-height: 20px;
-  border-bottom: solid 1px #ccc;
-  border-bottom-left-radius: 0;
-  border-bottom-right-radius: 0;
-}
-.ui-tabs .ui-tabs-nav li {
-  padding: 0 1em 0 10px;
-  margin: 0;
-  list-style: none;
-}
-.ui-tabs .ui-tabs-nav li a {
-  float: none;
-  padding: 0 10px;
-  border-radius: 10px;
-}
-.ui-tabs .ui-tabs-nav li.ui-tabs-selected a {
-  color: #fff;
-  background: #666;
-  font-weight: normal;
-}
-
-/**
- * Overlays
- */
-.ui-widget-overlay {
-  background: #000;
-  opacity: .70;
-  filter: Alpha(Opacity=70);
-}
-
-/**
- * Slider
- */
-.ui-slider {
-  border: solid 1px #ccc;
-}
-.ui-slider .ui-slider-range {
-  background: #e4e4e4;
-}
-.ui-slider .ui-slider-handle {
-  border: 1px solid #e4e4e4;
-  border-bottom: 1px solid #b4b4b4;
-  border-left-color: #D2D2D2;
-  border-right-color: #D2D2D2;
-  background-color: #e4e4e4;
-  border-radius: 4px;
-}
-.ui-slider a.ui-state-active,
-.ui-slider .ui-slider-handle:active {
-  background: #666;
-  color: #fff;
-  border: solid 1px #555;
-}
-
-/**
- * Progress Bar
- */
-.ui-progressbar {
-  background: #e4e4e4;
-  height: 1.4em;
-}
-.ui-progressbar .ui-progressbar-value {
-  background: #0072b9 url(../../misc/progress.gif);
-  height: 1.5em;
-}
-
-/**
- * Date Picker
- */
-.ui-datepicker {
-  border: none;
-}
-.ui-datepicker td span, .ui-datepicker td a {
-  text-align: center;
-}
-.ui-datepicker .ui-state-highlight {
-  background: #E4E4E4;
-  border-color: #D2D2D2;
-  color: #000;
-}
diff --git a/core/themes/seven/maintenance-page.css b/core/themes/seven/maintenance-page.css
deleted file mode 100644
index bc56fa0..0000000
--- a/core/themes/seven/maintenance-page.css
+++ /dev/null
@@ -1,184 +0,0 @@
-/**
- * @file
- * Maintenance theming.
- */
-.maintenance-background {
-  background-color: #e0e0d8;
-  background-image: -webkit-radial-gradient(hsl(203, 2%, 90%), hsl(203, 2%, 95%));
-  background-image: -moz-radial-gradient(hsl(203, 2%, 90%), hsl(203, 2%, 95%));
-  background-image: -o-radial-gradient(hsl(203, 2%, 90%), hsl(203, 2%, 95%));
-  background-image: radial-gradient(hsl(203, 2%, 90%), hsl(203, 2%, 95%));
-  background-repeat: repeat;
-  background-position: left top, 50% 50%;
-  min-height: 100%;
-}
-
-/* Maintenance theming */
-.install-page,
-.in-maintenance {
-  background: none;
-}
-.name-and-slogan h1 {
-  font-size: 2em;
-  line-height: 1.2em;
-  color: #0074bd;
-}
-
-/**
- * Task list & step indicator
- */
-@media all and (max-width: 48em) { /* 768px */
-  header[role="banner"] {
-    position: relative;
-  }
-  .step-indicator {
-    display: block;
-    font-size: 1.385em;
-    position: absolute;
-    top: 0.2em;
-    right: 0.5em;
-  }
-  [dir="rtl"] .step-indicator {
-    left: 2em;
-    right: auto;
-  }
-  .task-list {
-    display: none;
-  }
-}
-
-@media all and (min-width: 48em) { /* 768px */
-  .step-indicator {
-    display: none;
-  }
-  .task-list {
-    margin-left: 0; /* LTR */
-    list-style-type: none;
-    list-style-image: none;
-    padding-left: 0; /* LTR */
-    padding-bottom: 1em;
-  }
-  [dir="rtl"] .task-list {
-    margin-right: 0;
-    padding-right: 0;
-  }
-  .task-list li {
-    padding: 0.5em 1em 0.5em 3.85em; /* LTR */
-    color: #1a1a1a;
-  }
-  [dir="rtl"] .task-list li {
-    padding: 0.5em 1em 0.5em 1em;
-  }
-  .task-list .active {
-    background: #ebeae4;
-    position: relative;
-    font-weight: normal;
-  }
-  .task-list .active:after {
-    left: 100%; /* LTR */
-    border: solid transparent;
-    border-color: rgba(235, 234, 228, 0);
-    border-left-color: #ebeae4; /* LTR */
-    border-width: 1.35em;
-    content: " ";
-    height: 0;
-    width: 0;
-    position: absolute;
-    pointer-events: none;
-    top: 50%;
-    margin-top: -1.32em;
-  }
-  [dir="rtl"] .task-list .active:after {
-    left: auto;
-    right: 100%;
-    border-left-color: transparent;
-    border-right-color: #ebeae4;
-  }
-  .task-list .done {
-    color: #adadad;
-  }
-}
-
-/**
- * Layout
- */
-.l-container {
-  background: #fff;
-  width: auto;
-  margin-left: 1.25em;
-  margin-right: 1.25em;
-}
-.l-container:after { /* no reason for a clearfix in the markup */
-  content: "";
-  display: table;
-  clear: both;
-}
-@media all and (max-width: 48em) { /* 768px */
-  .l-container {
-    margin: 1.25em;
-    padding: 10px 20px;
-  }
-  .name-and-slogan {
-    margin: 0 0 1.45em 0;
-  }
-}
-
-@media all and (min-width: 48em) { /* 768px */
-  html {
-    display: table;
-  }
-  .in-maintenance,
-  .install-page {
-    display: table-cell;
-    padding: 1em 0;
-    vertical-align: middle;
-  }
-  html, .install-page, .in-maintenance {
-    margin: 0;
-    width: 100%;
-    height: 100%;
-  }
-  .l-container {
-    margin: 0 auto;
-    max-width: 770px;
-    width: 75%;
-    border-radius: 5px;
-    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
-    padding: 20px 0 40px 0;
-  }
-
-  /* Positioning sidebar & content */
-  main {
-    -webkit-box-sizing: border-box;
-    -moz-box-sizing: border-box;
-    box-sizing: border-box;
-    clear: none;
-    float: left;
-    padding-left: 3.85em;
-    padding-right: 3.85em;
-    width: 65%;
-  }
-  [dir="rtl"] main {
-    float: right;
-  }
-  ul {
-    padding: 15px;
-    margin: 0.25em 0;
-  }
-  .l-sidebar-first {
-    float: left;
-    width: 35%;
-  }
-  [dir="rtl"] .l-sidebar-first {
-    float: right;
-  }
-
-  /* Margins for sitename */
-  h1.page-title,
-  .name-and-slogan h1 {
-    margin: 0.75em 0 0.75em 1.9em; /* LTR */
-  }
-  [dir="rtl"] .name-and-slogan h1 {
-    margin: 0.75em 1.9em 0.75em 0;
-  }
-}
diff --git a/core/themes/seven/quickedit.css b/core/themes/seven/quickedit.css
deleted file mode 100644
index 5172b60..0000000
--- a/core/themes/seven/quickedit.css
+++ /dev/null
@@ -1,67 +0,0 @@
-/**
- * @file
- * Override Quick Edit's entity toolbar style on the Drupal front-end.
- *
- * I.e. loaded by Quick Edit on the front-end, despite this being a back-end theme.
- */
-
-/**
- * The Seven style guide prescribes softer corners.
- */
-.quickedit-toolbar-container > .quickedit-toolbar-content,
-.quickedit-toolbar-container > .quickedit-toolbar-lining {
-  border-radius: 4px;
-}
-.quickedit-button {
-  border-radius: 3px;
-}
-
-/**
- * Entity toolbar's "save" button must be styled like a Seven primary button.
- */
-.quickedit-button.action-save,
-.quickedit-button.action-saving {
-  border-color: #1e5c90;
-  background-image: -webkit-linear-gradient(top, #007bc6, #0071b8);
-  background-image:    -moz-linear-gradient(top, #007bc6, #0071b8);
-  background-image:      -o-linear-gradient(top, #007bc6, #0071b8);
-  background-image:   linear-gradient(to bottom, #007bc6, #0071b8);
-  color: #fff;
-  text-shadow: 0 1px hsla(0, 0%, 0%, 0.5);
-  font-weight: 700;
-  -webkit-font-smoothing: antialiased;
-  margin-top: 2px;
-}
-.quickedit-button.action-save:focus,
-.quickedit-button.action-save:hover,
-.quickedit-button.action-saving:focus
-.quickedit-button.action-saving:hover {
-  background-color: #2369a6;
-  background-image: -webkit-linear-gradient(top, #0c97ed, #1f86c7);
-  background-image:    -moz-linear-gradient(top, #0c97ed, #1f86c7);
-  background-image:      -o-linear-gradient(top, #0c97ed, #1f86c7);
-  background-image:   linear-gradient(to bottom, #0c97ed, #1f86c7);
-  border-color: #1e5c90;
-  color: #fff;
-}
-.quickedit-button.action-save:hover,
-.quickedit-button.action-saving:hover {
-  box-shadow: 0 1px 2px hsla(203, 10%, 10%, 0.25);
-}
-.quickedit-button.action-save:active,
-.quickedit-button.action-saving:active {
-  background-image: -webkit-linear-gradient(top, #08639b, #0071b8);
-  background-image:    -moz-linear-gradient(top, #08639b, #0071b8);
-  background-image:      -o-linear-gradient(top, #08639b, #0071b8);
-  background-image:   linear-gradient(to bottom, #08639b, #0071b8);
-  border-color: #144b78;
-  box-shadow: inset 0 1px 3px hsla(0, 0%, 0%, 0.2);
-}
-
-/**
- * The entity toolbar's "save" button's top margin shifts both buttons 2px down,
- * so we must compensate for that to achieve vertically centered positioning.
- */
-.quickedit .icon-close:before {
-  top: 8px;
-}
diff --git a/core/themes/seven/seven.base.css b/core/themes/seven/seven.base.css
deleted file mode 100644
index 844712d..0000000
--- a/core/themes/seven/seven.base.css
+++ /dev/null
@@ -1,136 +0,0 @@
-/**
- * Generic elements.
- */
-body {
-  color: #000;
-  background: #fff;
-  font: normal 81.3%/1.538em "Lucida Grande", "Lucida Sans Unicode", sans-serif;
-}
-a,
-.link {
-  color: #0074bd;
-  text-decoration: none;
-}
-a:hover,
-.link:hover {
-  text-decoration: underline;
-}
-hr {
-  margin: 0;
-  padding: 0;
-  border: none;
-  height: 1px;
-  background: #cccccc;
-}
-summary,
-.fieldgroup:not(.form-composite) > legend {
-  font-weight: bold;
-  text-transform: uppercase;
-}
-h1,
-h2,
-h3,
-h4,
-h5,
-h6 {
-  font-weight: bold;
-  margin: 10px 0;
-}
-h1 {
-  font-size: 1.538em;
-}
-h2 {
-  font-size: 1.385em;
-}
-h3 {
-  font-size: 1.231em;
-}
-h4 {
-  font-size: 1.154em;
-}
-h5,
-h6 {
-  font-size: 1.077em;
-}
-p {
-  margin: 1em 0;
-}
-dl {
-  margin: 0 0 20px;
-}
-dl dd,
-dl dl {
-  margin-left: 20px; /* LTR */
-  margin-bottom: 10px;
-}
-[dir="rtl"] dl dd,
-[dir="rtl"] dl dl {
-  margin-right: 20px;
-}
-blockquote {
-  margin: 1em 40px;
-}
-address {
-  font-style: italic;
-}
-u,
-ins {
-  text-decoration: underline;
-}
-s,
-strike,
-del {
-  text-decoration: line-through;
-}
-big {
-  font-size: larger;
-}
-small {
-  font-size: smaller;
-}
-sub {
-  vertical-align: sub;
-  font-size: smaller;
-  line-height: normal;
-}
-sup {
-  vertical-align: super;
-  font-size: smaller;
-  line-height: normal;
-}
-nobr {
-  white-space: nowrap;
-}
-abbr,
-acronym {
-  border-bottom: dotted 1px;
-}
-ul {
-  list-style-type: disc;
-  list-style-image: none;
-  margin: 0.25em 0 0.25em 1.5em; /* LTR */
-}
-[dir="rtl"] ul {
-  margin: 0.25em 1.5em 0.25em 0;
-}
-ol {
-  list-style-type: decimal;
-  margin: 0.25em 0 0.25em 2em; /* LTR */
-  padding: 0;
-}
-[dir="rtl"] ol {
-  margin: 0.25em 2em 0.25em 0;
-}
-quote,
-code {
-  margin: .5em 0;
-}
-code,
-pre,
-kbd {
-  font-size: 1.231em;
-}
-pre {
-  margin: 0.5em 0;
-  white-space: pre-wrap;
-}
diff --git a/core/themes/seven/seven.info.yml b/core/themes/seven/seven.info.yml
index 19ec447..4b41653 100644
--- a/core/themes/seven/seven.info.yml
+++ b/core/themes/seven/seven.info.yml
@@ -6,17 +6,17 @@ version: VERSION
 core: 8.x
 stylesheets:
   screen:
-    - seven.base.css
-    - style.css
+    - css/seven.base.css
+    - css/style.css
     - css/components/buttons.css
     - css/components/buttons.theme.css
     - css/components/dropbutton.component.css
     - css/components/tour.theme.css
 stylesheets-override:
-  - vertical-tabs.css
-  - jquery.ui.theme.css
+  - css/vertical-tabs.css
+  - css/jquery.ui.theme.css
 quickedit_stylesheets:
-  - quickedit.css
+  - css/quickedit.css
 regions:
   content: Content
   help: Help
diff --git a/core/themes/seven/seven.libraries.yml b/core/themes/seven/seven.libraries.yml
index fb22ac1..cc4efee 100644
--- a/core/themes/seven/seven.libraries.yml
+++ b/core/themes/seven/seven.libraries.yml
@@ -4,7 +4,7 @@ maintenance-page:
     js/mobile.install.js: {}
   css:
     theme:
-      maintenance-page.css: {}
+      css/maintenance-page.css: {}
   dependencies:
     - system/maintenance
 
@@ -14,7 +14,7 @@ install-page:
     js/mobile.install.js: {}
   css:
     theme:
-      install-page.css: {}
+      css/install-page.css: {}
   dependencies:
     - system/maintenance
 
diff --git a/core/themes/seven/style.css b/core/themes/seven/style.css
deleted file mode 100644
index f1cb442..0000000
--- a/core/themes/seven/style.css
+++ /dev/null
@@ -1,1505 +0,0 @@
-/**
- * Menus and lists.
- */
-.item-list ul {
-  list-style-type: disc;
-  list-style-image: none;
-  margin: 0.25em 0 0.25em 1.5em; /* LTR */
-}
-[dir="rtl"] .item-list ul {
-  margin: 0.25em 1.5em 0.25em 0;
-}
-.item-list ul li,
-li.leaf,
-ul.menu li {
-  list-style-type: disc;
-  list-style-image: none;
-}
-ul.menu li {
-  margin: 0;
-}
-.item-list ul li.collapsed,
-ul.menu li.collapsed {
-  list-style-image: url(../../misc/menu-collapsed.png);
-  list-style-type: disc;
-}
-.item-list ul li.expanded,
-ul.menu li.expanded {
-  list-style-image: url(../../misc/menu-expanded.png);
-  list-style-type: circle;
-}
-/**
- * Skip link.
- */
-.skip-link {
-  margin-top: 0;
-  position: absolute;
-  left: 50%; /* LTR */
-  margin-left: -5.25em; /* LTR */
-  width: auto;
-  z-index: 50;
-}
-[dir="rtl"] .skip-link {
-  right: 50%;
-  margin-right: -5.25em;
-}
-.skip-link,
-.skip-link:link,
-.skip-link:visited {
-  display: inline-block;
-  background: #444;
-  color: #fff;
-  font-size: 0.94em;
-  padding: 1px 10px 2px 10px; /* LTR */
-  text-decoration: none;
-  border-radius: 0 0 10px 10px;
-}
-[dir="rtl"] .skip-link,
-[dir="rtl"] .skip-link:link,
-[dir="rtl"] .skip-link:visited {
-  padding: 1px 10px 2px 10px;
-}
-.skip-link:hover,
-.skip-link:focus,
-.skip-link:active {
-  outline: 0;
-}
-.skip-link.visually-hidden.focusable:active,
-.skip-link.visually-hidden.focusable:focus,
-.skip-link.visually-hidden.focusable:hover
-{
-  position: absolute !important;
-}
-
-/**
- * Branding.
- */
-#branding {
-  overflow: hidden;
-  background-color: #e0e0d8;
-  padding: 24px 0 0;
-}
-/* This layout styling is a copy of #page.
- * @TODO: Replace with reuseable layout classes.
- **/
-.branding__inner {
-  margin-left: 1.25em;
-  margin-right: 1.25em;
-}
-@media screen and (min-width:45em) { /* 720px */
-  .branding__inner {
-    margin-left: 2.5em;
-    margin-right: 2.5em;
-  }
-}
-[dir="rtl"] #branding {
-  padding: 20px 20px 0 20px;
-}
-.breadcrumb {
-  font-size: 0.846em;
-  line-height: 1em;
-  padding: 20px 0 10px 0;
-}
-
-/**
- * Help.
- */
-#help {
-  font-size: 0.923em;
-}
-#help p {
-  margin: 0 0 10px;
-}
-#help div.more-help-link {
-  text-align: right; /* LTR */
-}
-[dir="rtl"] #help div.more-help-link {
-  text-align: left;
-}
-
-/**
- * Page title.
- */
-#page-title {
-  padding-top: 20px;
-}
-#branding .page-title {
-  color: #333;
-  display: inline-block;
-  margin: 0;
-  font-size: 1.625em;
-  line-height: 1.875em;
-  font-weight: 600;
-  -webkit-font-smoothing: antialiased;
-}
-[dir="rtl"] #branding h1.page-title {
-  float: right;
-}
-
-/**
- * Console.
- */
-#console {
-  margin: 9px 0 10px;
-}
-
-/**
- * Tabs.
- */
-.is-collapse-enabled  .tabs,
-.is-horizontal .tabs {
-  position: relative;
-}
-.is-collapse-enabled .tabs:before,
-.is-horizontal .tabs:before {
-  content: '';
-  display: block;
-  background-color: #A6A6A6;
-  height: 1px;
-  position: absolute;
-  bottom: 0;
-  left: 0;
-  z-index: 10;
-  right: 0;
-}
-
-/* Span the full width of the viewport */
-.branding__inner .is-horizontal .tabs:before,
-.branding__inner .is-collapse-enabled .tabs:before {
-  left: -2.5em;
-  right: -2.5em;
-}
-
-/**
- * Tab
- *
- * 1. Required by some elements such as <button>
- * 2. Fixed height needed to ensure alignment with absolutely-positioned
- *    active tab.
- */
-.tabs__tab {
-  position: relative;
-  display: block;
-  overflow: hidden;
-  -webkit-box-sizing: border-box;
-  -moz-box-sizing: border-box;
-  box-sizing: border-box;
-  margin: -1px 0 0;
-  padding: 9px 2em 7px 1em;
-  width: 100%;  /* 1 */
-  border: 1px solid #bfbfbf;
-  background-color: rgba(242, 242, 240, 0.7);
-  color: #0074bd;
-  text-overflow: ellipsis;
-  white-space: nowrap;
-}
-.tabs__tab:hover {
-  color: #008ee6;
-  background-color: #fafaf7;
-}
-li.tabs__tab {
-  padding: 0;
-}
-li.tabs__tab a {
-  padding: 9px 2em 7px 1em;
-}
-.tabs a:hover,
-.tabs a:focus {
-  text-decoration: none;
-}
-
-/* Primary tabs */
-.tabs.primary {
-  clear: both;
-  margin: 16px 0 0;
-  margin: 1rem 0 0;
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-/**
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-/**
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-/**
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-caption {
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-[dir="rtl"] caption {
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-td {
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-[dir="rtl"] td {
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-th > a {
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-
-/* 1. Must match negative bottom padding of the parent <th> */
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-th.active img {
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-[dir="rtl"] th.active img {
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-th > a:hover,
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-/* Force browsers to calculate the width of a 'select all' TH element. */
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-
-/**
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- */
-.caption {
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-
-/**
- * Status report table.
- */
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-table.system-status-report tr.ok {
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-table.system-status-report tr.error {
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-
-/**
- * Responsive tables.
- */
-@media screen and (max-width: 37.5em) { /* 600px */
-  th.priority-low,
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-@media screen and (max-width: 60em) { /* 920px */
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-
-/**
- * Collapsible details.
- */
-details {
-  line-height: 1.295em;
-}
-details summary {
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-  padding-bottom: 0.5em;
-}
-
-/**
- * Form elements.
- */
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-}
-fieldset {
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-}
-.fieldgroup {
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-}
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-/* Filter */
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-[dir="rtl"] ul.tips li {
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-[dir="rtl"] body div.form-type-radio div.description,
-[dir="rtl"] body div.form-type-checkbox div.description {
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-}
-input.form-text:focus,
-input.form-tel:focus,
-input.form-email:focus,
-input.form-url:focus,
-input.form-search:focus,
-input.form-number:focus,
-input.form-color:focus,
-input.form-file:focus,
-textarea.form-textarea:focus,
-select.form-select:focus {
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-  outline-color: rgba(0, 116, 189, 0.5);
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-
-/**
- * Improve spacing of cancel link.
- */
-#edit-cancel {
-  margin-left: 10px; /* LTR */
-}
-[dir="rtl"] #edit-cancel {
-  margin-left: 0;
-  margin-right: 10px;
-}
-
-/**
- * Improve form element usability on narrow devices.
- */
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-  }
-  input.form-autocomplete,
-  input.form-text,
-  input.form-tel,
-  input.form-email,
-  input.form-url,
-  input.form-search,
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-  input.form-color,
-  input.form-file,
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-  .form-actions input:first-child,
-  .form-wrapper input[type="submit"]:first-child {
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-  }
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-  #dblog-filter-form .form-actions {
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-    padding: 0;
-  }
-  #edit-cancel {
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-  }
-}
-
-/* Exceptions */
-#diff-inline-form select,
-div.filter-options select {
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-}
-
-/**
- * System.
- */
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-div.admin-panel h3 {
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-/* admin/appearance */
-#system-themes-page h2 {
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-}
-.theme-selector h3 {
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-}
-.theme-default h3 {
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-}
-
-/* Update options. */
-div.admin-options {
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-  line-height: 30px;
-  height: 30px;
-  padding: 9px;
-  border: 1px solid #ccc;
-  margin: 0 0 10px;
-}
-div.admin-options label {
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-  font: 0.846em/1.875em Lucida Grande, Lucida Sans Unicode, sans-serif;
-}
-div.admin-options label,
-div.admin-options div.form-item {
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-  float: left; /* LTR */
-}
-[dir="rtl"] div.admin-options label,
-[dir="rtl"] div.admin-options div.form-item {
-  margin-left: 10px;
-  margin-right: 0;
-  float: right;
-}
-div.admin-options div.form-item {
-  padding: 0;
-  border: 0;
-}
-
-/* Update status */
-.versions table.version {
-  border: none;
-}
-
-/* Field UI */
-
-#field-display-overview input.field-plugin-settings-edit {
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-  padding: 1px 8px;
-}
-#field-display-overview tr.field-plugin-settings-changed {
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-#field-display-overview tr.drag {
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-#field-display-overview .field-plugin-settings-edit-form .form-submit {
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-}
-
-/* Modules page */
-#system-modules fieldset {
-  border: 0;
-  border-top: 1px solid #ccc;
-}
-#system-modules .fieldset-wrapper {
-  padding: 0;
-}
-#system-modules table,
-#locale-translation-status-form table {
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-#system-modules tr.even,
-#system-modules tr.odd,
-#locale-translation-status-form tr.even,
-#locale-translation-status-form tr.odd {
-  background: #f3f4ee;
-  border: 0;
-  border-bottom: 10px solid #fff;
-}
-#system-modules tr td:last-child,
-#locale-translation-status-form tr td:last-child {
-  border: 0;
-}
-#system-modules table th,
-#locale-translation-status-form table th {
-  border: 0;
-  border-bottom: 10px solid #fff;
-}
-#system-modules .sticky-header th,
-#locale-translation-status-form .sticky-header th {
-  border: 0;
-}
-/* Recent content block */
-#block-node-recent table,
-#block-node-recent tr {
-  border: none;
-}
-#block-node-recent .more-link {
-  padding: 0 5px 5px 0; /* LTR */
-}
-[dir="rtl"] #block-node-recent .more-link {
-  padding: 0 0 5px 5px;
-}
-
-/**
- * Views styling
- */
-
-/* @group Forms */
-
-/**
- * Seven positions the summary absolutely, but does not have a way to ignore
- * details without a summary so we make one up.
- *
- * @todo Neither a fieldset without legend nor a details without summary is
- *   valid HTML markup in any way. Refactor Views UI to not produce such invalid
- *   markup.
- */
-details.fieldset-no-legend {
-  padding-top: 0;
-}
-
-/**
- * Being extra safe here and scoping this to the add view wizard form (where
- * a layout problem occurs for the Display format details if we don't fix its
- * padding), but it's probably safe to just let it apply everywhere.
- */
-#views-ui-add-form details details .details-wrapper {
-  padding-left: 0;
-  padding-right: 0;
-}
-
-.views-display-tab details.box-padding .details-wrapper {
-  padding: 0;
-}
-
-.views-admin .form-item label.option,
-#views-ui-preview-form .form-item label.option {
-  font-size: 1em;
-}
-
-.views-admin input.form-submit,
-.views-ui-dialog input.form-submit,
-.views-admin a.button,
-.views-ui-dialog a.button {
-  margin-bottom: 0;
-  margin-right: 0; /* LTR */
-  margin-top: 0;
-}
-[dir="rtl"] .views-admin input.form-submit,
-[dir="rtl"] .views-ui-dialog input.form-submit,
-[dir="rtl"] .views-admin a.button,
-[dir="rtl"] .views-ui-dialog a.button {
-  margin-left: 0;
-}
-
-/* Override for a button on the edit display screen */
-#edit-displays-preview-controls .form-submit {
-  display: inline-block;
-  margin-right: 1em;
-}
-
-.form-radios > .form-item {
-  margin-top: 3px;
-}
-
-/* @group Dependent options
- */
-
-/* This is necessary to supercede the Seven .form-item
- * reset declaration that sets the margin to zero.
- */
-.form-item-options-expose-required,
-.form-item-options-expose-label,
-.form-item-options-expose-description {
-  margin-left: 1.5em;
-}
-
-.views-admin-dependent .form-item .form-item,
-.views-admin-dependent .form-type-checkboxes,
-.views-admin-dependent .form-type-radios,
-.views-admin-dependent .form-item .form-item,
-.form-item-options-expose-required,
-.form-item-options-expose-label,
-.form-item-options-expose-description {
-  margin-bottom: 6px;
-  margin-top: 6px;
-}
-
-.views-admin-dependent .form-type-radio,
-.views-admin-dependent .form-radios .form-item {
-  margin-bottom: 2px;
-  margin-top: 2px;
-}
-
-/* @end */
-
-/* @group Lists */
-
-.views-admin ul.secondary,
-.views-admin .item-list ul {
-  margin: 0;
-  padding: 0;
-}
-
-.views-displays ul.secondary li a,
-.views-displays ul.secondary li.active a,
-.views-displays ul.secondary li.active a.active {
-  padding: 2px 7px 3px;
-}
-
-.views-displays ul.secondary li a {
-  color: #0074bd;
-}
-
-.views-displays ul.secondary li.active a,
-.views-displays ul.secondary li.active a.active {
-  border: 1px solid transparent;
-}
-
-.views-admin .links li {
-  padding-right: 0; /* LTR */
-}
-[dir="rtl"] .views-admin .links li {
-  padding-left: 0;
-}
-
-.views-admin .button .links li {
-  padding-right: 12px; /* LTR */
-}
-[dir="rtl"] .views-admin .button .links li {
-  padding-left: 12px;
-}
-
-.views-display-top ul.secondary {
-  background-color: transparent;
-  float: left
-}
-
-.views-display-top .secondary .action-list li {
-  float: none;
-  margin: 0;
-}
-
-/* @end */
-
-/* @group Tables */
-
-.views-ui-rearrange-filter-form table td,
-.views-ui-rearrange-filter-form table th {
-  vertical-align: top;
-}
-
-/* @end */
-
-/* @group Attachment details */
-
-#edit-display-settings-title {
-  color: #008BCB;
-}
-
-/* @end */
-
-/* @group Attachment details tabs
- *
- * The tabs that switch between sections
- */
-
-.views-displays .secondary {
- text-align: left; /* LTR */
-}
-[dir="rtl"] .views-displays .secondary {
-  text-align: right;
-}
-
-.views-admin .icon.add {
-  background-position: center 3px;
-}
-
-.views-displays .secondary a:hover > .icon.add {
-  background-position: center -25px;
-}
-
-.views-displays .secondary .open > a {
-  border-radius: 7px 7px 0 0;
-}
-
-.views-displays .secondary .open > a:hover {
-  background-color: #f1f1f1;
-  color: #008BCB;
-}
-
-.views-displays .secondary .action-list  li:first-child {
-  border-radius: 0 7px 0 0;
-}
-
-.views-displays .secondary .action-list  li:last-child {
-  border-radius: 0 0 7px 7px;
-}
-
-.views-displays .secondary .action-list input.form-submit {
-  color: #008bcb;
-}
-
-/* @end */
-
-/* @group Attachment buckets
- *
- * These are the individual "buckets," or boxes, inside the display settings area
- */
-
-.views-ui-display-tab-bucket h3 {
-  font-size: 12px;
-  text-transform: uppercase;
-}
-
-.views-ui-display-tab-bucket .links {
-  padding: 2px 6px 4px;
-}
-
-.views-ui-display-tab-bucket .links li + li {
-  margin-left: 3px;
-}
-
-/* @end */
-
-/* @group Rearrange filter criteria */
-
-#views-ui-rearrange-filter-form .action-links {
-  margin: 0;
-  padding: 0;
-}
-
-#views-ui-rearrange-filter-form table {
-  border: medium none;
-}
-
-#views-ui-rearrange-filter-form [id^="views-row"] {
-  border: medium none;
-}
-
-#views-ui-rearrange-filter-form tr td:last-child {
-  border-right: medium none;
-}
-
-#views-ui-rearrange-filter-form .filter-group-operator-row {
-  border-left: 1px solid transparent !important;
-  border-right: 1px solid transparent !important;
-}
-
-#views-ui-rearrange-filter-form tr.drag td {
-  background-color: #FFEE77 !important;
-}
-
-#views-ui-rearrange-filter-form tr.drag-previous td {
-  background-color: #FFFFBB !important;
-}
-
-/* @end */
-
-/* @group Live preview elements */
-
-.views-query-info pre {
-  margin-bottom: 0;
-  margin-top: 0;
-}
-
-/* @group Query info table */
-
-.views-query-info table {
-  border-radius: 7px;
-  -webkit-border-horizontal-spacing: 1px;
-  -webkit-border-vertical-spacing: 1px;
-}
-
-.views-query-info table tr td:last-child {
-  /* Fixes a Seven style that bleeds down into this table unnecessarily */
-  border-right: 0 none;
-}
-
-/* @end */
-
-/* @end */
-
-/* @group Add view */
-
-.form-item-page-create,
-.form-item-block-create {
-  margin-top: 13px;
-}
-
-/* @end */
-
-/* @group Modal dialog box
- *
- * The contents of the popup dialog on the views edit form.
- */
-
-.filterable-option .form-item.form-type-checkbox {
-  /* This selector is aggressive because Seven's reset for .form-items is aggressive. */
-  padding-bottom: 4px;
-  padding-left: 4px;
-  padding-top: 4px;
-}
-
-/* @end */
-
-/**
- * Entity meta settings.
- */
-.entity-meta {
-  background-color: #ececec;
-  border-bottom: 0;
-  border-left: 1px solid #bfbfbf;
-  border-right: 1px solid #bfbfbf;
-  border-top: 0;
-  box-shadow: inset 0 0 5px rgba(0, 0, 0, .15);
-  margin-top: 0;
-  padding-top: 0;
-}
-.entity-meta-header,
-.entity-meta details {
-  background-color: #f7f7f7;
-  border-top: 1px solid #bfbfbf;
-  border-bottom: 1px solid #bfbfbf;
-}
-.entity-meta-header {
-  padding: 1em 1.5em;
-}
-.entity-meta-header .form-item {
-  margin: .25em 0;
-}
-.entity-meta-header .published {
-  font-size: 1.231em;
-  font-weight: bold;
-  text-shadow: 0 1px 0 #fff;
-}
-.entity-meta-header .changed {
-  font-style: italic; /* As-designed, but really: why is this italic? */
-}
-.entity-meta details {
-  border-left: 0;
-  border-right: 0;
-  border-top: 1px solid #ffffff;
-  margin: 0;
-}
-.entity-meta details[open] {
-  background-color: transparent;
-  background-image: -webkit-linear-gradient(top, rgba(0, 0, 0, .125), transparent 4px);
-  background-image:    -moz-linear-gradient(top, rgba(0, 0, 0, .125), transparent 4px);
-  background-image:      -o-linear-gradient(top, rgba(0, 0, 0, .125), transparent 4px);
-  background-image:         linear-gradient(to bottom, rgba(0, 0, 0, .125), transparent 4px);
-  border-top-width: 0;
-  padding-top: 1px;
-}
-.entity-meta details[open] + [open] {
-  background-image: none;
-  border-top-width: 1px;
-  padding-top: 0;
-}
-.entity-meta details > .details-wrapper {
-  padding-top: 0;
-}
-.entity-meta details > summary {
-  padding: 0.85em 1.25em;
-  text-shadow: 0 1px 0 white;
-}
-.entity-meta details .summary {
- display: none; /* Hide JS summaries. @todo Rethink summaries. */
-}
-
-/**
- * Widescreen
- *
- * Both of the following media queries must *exactly* match what is in
- * node.module.css. This is rather crazy.
- *
- * @todo Figure out how to reduce media query duplication across files
- *       and modules. Layout styles only allowed in themes?
- */
-@media
-  screen and (min-width: 780px),
-  (orientation: landscape) and (min-device-height: 780px) {
-
-  [class*="page-node-add-"] #console,
-  .page-node-edit #console {
-    margin: 0 2em;
-  }
-  [class*="page-node-add-"] .messages,
-  .page-node-edit .messages {
-    margin-top: 1em;
-    margin-bottom: 1em;
-  }
-}
-@media
-  screen and (max-width: 1020px),
-  (orientation: landscape) and (max-device-height: 1020px) {
-
-  .toolbar-vertical .block-list-secondary,
-  .toolbar-vertical .layout-region-node-secondary {
-    margin-bottom: 0;
-    padding-bottom: 0;
-    display: block;
-  }
-  .toolbar-vertical .layout-node-form:after {
-    display: none;
-  }
-}
-
-/* Delete button */
-.form-actions .button-danger {
-  color: #c72100;
-  background: none;
-  border: none;
-  float: right;
-  margin-right: 0;
-  margin-left: 0;
-  padding-right: 0;
-  padding-left: 0;
-}
-.form-actions .button-danger:hover,
-.form-actions .button-danger:focus {
-  color: #ff2a00;
-  background: none;
-  border: none;
-  text-decoration: underline;
-}
-.form-actions .button-danger:active {
-  color: #ff2a00;
-  background: none;
-  border: none;
-  text-decoration: underline;
-}
diff --git a/core/themes/seven/vertical-tabs.css b/core/themes/seven/vertical-tabs.css
deleted file mode 100644
index 325a3af..0000000
--- a/core/themes/seven/vertical-tabs.css
+++ /dev/null
@@ -1,109 +0,0 @@
-/**
- * Override of misc/vertical-tabs.css.
- */
-.vertical-tabs {
-  position: relative;
-  overflow: hidden;
-  margin: 10px 0;
-  border: 1px solid #bdbdbd;
-  border-radius: 4px;
-  background: #e6e5e1;
-}
-.vertical-tabs-list {
-  float: left; /* LTR */
-  width: 240px;
-  margin: 0 -100% -1px 0; /* LTR */
-  padding: 0;
-  border-bottom: 1px solid #ccc;
-  line-height: 1;
-}
-[dir="rtl"] .vertical-tabs-list {
-  float: right;
-  margin: 0 0 -1px -100%;
-}
-.vertical-tab-button {
-  position: relative;
-  margin: 0;
-  list-style: none;
-  list-style-image: none;
-}
-.vertical-tab-button.selected {
-  z-index: 1;
-  overflow-x: hidden;
-  width: 100%;
-  border-right: 1px solid #fcfcfa; /* LTR */
-  box-shadow: 0 5px 5px -5px hsla(0, 0%, 0%, 0.3);
-}
-[dir="rtl"] .vertical-tab-button.selected {
-  border-left: 1px solid #fcfcfa;
-  border-right: none;
-}
-.vertical-tab-button:focus,
-.vertical-tab-button:active {
-  z-index: 2;
-}
-.vertical-tab-button a {
-  display: block;
-  padding: 10px 15px 15px;
-  border-bottom: 1px solid #b3b2ad;
-  background-color: #f2f2f0;
-  text-shadow: 0 1px hsla(0, 0%, 100%, 0.6);
-  text-decoration: none;
-}
-.vertical-tab-button:last-child a {
-  border-bottom: 0;
-}
-.vertical-tab-button.selected a,
-.vertical-tab-button a:hover,
-.vertical-tab-button a:focus {
-  background: #fcfcfa;
-  text-shadow: none;
-  text-decoration: none;
-}
-.vertical-tab-button.selected a {
-  border-bottom-color: #b3b2ad;
-  color: #004f80;
-}
-.vertical-tab-button.selected a:hover,
-.vertical-tab-button.selected a:focus {
-  color: #007ecc;
-}
-[data-vertical-tabs-panes] {
-  background-color: #fcfcfa;
-}
-.vertical-tabs-panes {
-  margin: 0 0 0 240px; /* LTR */
-  padding: 10px 15px 10px 15px;
-  border-left: 1px solid #a6a5a1; /* LTR */
-}
-[dir="rtl"] .vertical-tabs-panes {
-  margin: 0 240px 0 0;
-  border-left: none;
-  border-right: 1px solid #a6a5a1;
-}
-.vertical-tabs-panes:after {
-  content: "";
-  display: table;
-  clear: both;
-}
-.vertical-tabs-pane {
-  margin: 0;
-  padding: 0;
-  border: 0;
-  color: #595959;
-}
-.vertical-tab-button strong {
-  font-size: 0.923em;
-}
-.vertical-tab-button .summary {
-  display: block;
-  padding-top: 0.4em;
-  color: #666;
-  font-size: 0.846em;
-}
-.vertical-tab-button.selected a:focus strong {
-  text-decoration: underline;
-}
-.vertical-tabs-pane > summary {
-  display: none;
-}
