diff --git a/core/themes/classy/templates/system/element/datetime-form.html.twig b/core/themes/classy/templates/system/element/datetime-form.html.twig
new file mode 100644
index 0000000..bf31668
--- /dev/null
+++ b/core/themes/classy/templates/system/element/datetime-form.html.twig
@@ -0,0 +1,17 @@
+{#
+/**
+ * @file
+ * Default theme implementation of a datetime form element.
+ *
+ * Available variables:
+ * - attributes: HTML attributes for the datetime form element.
+ * - content: The datelist form element to be output.
+ *
+ * @see template_preprocess_datetime_form()
+ *
+ * @ingroup themeable
+ */
+#}
+<div{{ attributes.addClass('container-inline') }}>
+  {{ content }}
+</div>
diff --git a/core/themes/classy/templates/system/element/datetime-wrapper.html.twig b/core/themes/classy/templates/system/element/datetime-wrapper.html.twig
new file mode 100644
index 0000000..45ba069
--- /dev/null
+++ b/core/themes/classy/templates/system/element/datetime-wrapper.html.twig
@@ -0,0 +1,30 @@
+{#
+/**
+ * @file
+ * Default theme implementation of a datetime form wrapper.
+ *
+ * Available variables:
+ * - content: The form element to be output, usually a datelist, or datetime.
+ * - title: The title of the form element.
+ * - title_attributes: HTML attributes for the title wrapper.
+ * - description: Description text for the form element.
+ * - required: An indicator for whether the associated form element is required.
+ *
+ * @see template_preprocess_datetime_wrapper()
+ *
+ * @ingroup themeable
+ */
+#}
+{%
+  set title_classes = [
+    'label',
+    required ? 'form-required',
+  ]
+%}
+{% if title %}
+  <h4{{ title_attributes.addClass(title_classes) }}>{{ title }}</h4>
+{% endif %}
+{{ content }}
+{% if description %}
+  <div class="description">{{ description }}</div>
+{% endif %}
diff --git a/core/themes/classy/templates/system/element/details.html.twig b/core/themes/classy/templates/system/element/details.html.twig
new file mode 100644
index 0000000..17ea820
--- /dev/null
+++ b/core/themes/classy/templates/system/element/details.html.twig
@@ -0,0 +1,33 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a details element.
+ *
+ * Available variables
+ * - attributes: A list of HTML attributes for the details element.
+ * - title: (optional) The title of the element, may not be set.
+ * - description: (optional) The description of the element, may not be set.
+ * - children: (optional) The children of the element, may not be set.
+ * - value: (optional) The value of the element, may not be set.
+ *
+ * @see template_preprocess_details()
+ *
+ * @ingroup themeable
+ */
+#}
+<details{{ attributes }}>
+  {%- if title -%}
+    <summary{{ summary_attributes }}>{{ title }}</summary>
+  {%- endif -%}
+  <div class="details-wrapper">
+    {%- if description -%}
+      <div class="details-description">{{ description }}</div>
+    {%- endif -%}
+    {%- if children -%}
+      {{ children }}
+    {%- endif -%}
+    {%- if value -%}
+      {{ value }}
+    {%- endif -%}
+  </div>
+</details>
diff --git a/core/themes/classy/templates/system/element/image.html.twig b/core/themes/classy/templates/system/element/image.html.twig
new file mode 100644
index 0000000..2f29304
--- /dev/null
+++ b/core/themes/classy/templates/system/element/image.html.twig
@@ -0,0 +1,20 @@
+{#
+/**
+ * @file
+ * Default theme implementation of an image.
+ *
+ * Available variables:
+ * - attributes: HTML attributes for the img tag.
+ * - style_name: (optional) The name of the image style applied.
+ *
+ * @see template_preprocess_image()
+ *
+ * @ingroup themeable
+ */
+#}
+{%
+set classes = [
+  style_name ? 'image-style-' ~ style_name|clean_class,
+]
+%}
+<img{{ attributes.addClass(classes) }} />
diff --git a/core/themes/classy/templates/system/element/item-list.html.twig b/core/themes/classy/templates/system/element/item-list.html.twig
new file mode 100644
index 0000000..bd71e7f
--- /dev/null
+++ b/core/themes/classy/templates/system/element/item-list.html.twig
@@ -0,0 +1,36 @@
+{#
+/**
+ * @file
+ * Default theme implementation for an item list.
+ *
+ * Available variables:
+ * - items: A list of items. Each item contains:
+ *   - attributes: HTML attributes to be applied to each list item.
+ *   - value: The content of the list element.
+ * - title: The title of the list.
+ * - list_type: The tag for list element ("ul" or "ol").
+ * - attributes: HTML attributes to be applied to the list.
+ * - empty: A message to display when there are no items. Allowed value is a
+ *   string or render array.
+ *
+ * @see template_preprocess_item_list()
+ *
+ * @ingroup themeable
+ */
+#}
+{%- if items or empty -%}
+  <div class="item-list">
+    {%- if title is not empty -%}
+      <h3>{{ title }}</h3>
+    {%- endif -%}
+    {%- if items -%}
+      <{{ list_type }}{{ attributes }}>
+        {%- for item in items -%}
+          <li{{ item.attributes }}>{{ item.value }}</li>
+        {%- endfor -%}
+      </{{ list_type }}>
+    {%- else -%}
+      {{- empty -}}
+    {%- endif -%}
+  </div>
+{%- endif %}
diff --git a/core/themes/classy/templates/system/element/links.html.twig b/core/themes/classy/templates/system/element/links.html.twig
new file mode 100644
index 0000000..56c7ec2
--- /dev/null
+++ b/core/themes/classy/templates/system/element/links.html.twig
@@ -0,0 +1,60 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a set of links.
+ *
+ * Available variables:
+ * - attributes: Attributes for the UL containing the list of links.
+ * - links: Links to be output.
+ *   Each link will have the following elements:
+ *   - title: The link text.
+ *   - href: The link URL. If omitted, the 'title' is shown as a plain text
+ *     item in the links list. If 'href' is supplied, the entire link is passed
+ *     to l() as its $options parameter.
+ *   - html: (optional) Whether or not 'title' is HTML. If set, the title will
+ *     not be passed through \Drupal\Component\Utility\String::checkPlain().
+ *   - attributes: (optional) HTML attributes for the anchor, or for the <span>
+ *     tag if no 'href' is supplied.
+ *   - link_key: The link CSS class.
+ * - heading: (optional) A heading to precede the links.
+ *   - text: The heading text.
+ *   - level: The heading level (e.g. 'h2', 'h3').
+ *   - attributes: (optional) A keyed list of attributes for the heading.
+ *   If the heading is a string, it will be used as the text of the heading and
+ *   the level will default to 'h2'.
+ *
+ *   Headings should be used on navigation menus and any list of links that
+ *   consistently appears on multiple pages. To make the heading invisible use
+ *   the 'visually-hidden' CSS class. Do not use 'display:none', which
+ *   removes it from screen readers and assistive technology. Headings allow
+ *   screen reader and keyboard only users to navigate to or skip the links.
+ *   See http://juicystudio.com/article/screen-readers-display-none.php and
+ *   http://www.w3.org/TR/WCAG-TECHS/H42.html for more information.
+ *
+ * @see template_preprocess_links()
+ *
+ * @ingroup themeable
+ */
+#}
+{% if links -%}
+  {%- if heading -%}
+    {%- if heading.level -%}
+      <{{ heading.level }}{{ heading.attributes }}>{{ heading.text }}</{{ heading.level }}>
+    {%- else -%}
+      <h2{{ heading.attributes }}>{{ heading.text }}</h2>
+    {%- endif -%}
+  {%- endif -%}
+  <ul{{ attributes }}>
+    {%- for key, item in links -%}
+      <li{{ item.attributes.addClass(key|clean_class) }}>
+        {%- if item.link -%}
+          {{ item.link }}
+        {%- elseif item.text_attributes -%}
+          <span{{ item.text_attributes }}>{{ item.text }}</span>
+        {%- else -%}
+          {{ item.text }}
+        {%- endif -%}
+      </li>
+    {%- endfor -%}
+  </ul>
+{%- endif %}
diff --git a/core/themes/classy/templates/system/element/mark.html.twig b/core/themes/classy/templates/system/element/mark.html.twig
new file mode 100644
index 0000000..2798bb0
--- /dev/null
+++ b/core/themes/classy/templates/system/element/mark.html.twig
@@ -0,0 +1,22 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a marker for new or updated content.
+ *
+ * Available variables:
+ * - status: Number representing the marker status to display. Use the constants
+ *   below for comparison:
+ *   - MARK_NEW
+ *   - MARK_UPDATED
+ *   - MARK_READ
+ *
+ * @ingroup themeable
+ */
+#}
+{% if logged_in %}
+  {% if status is constant('MARK_NEW') %}
+    <span class="marker">{{ 'new'|t }}</span>
+  {% elseif status is constant('MARK_UPDATED') %}
+    <span class="marker">{{ 'updated'|t }}</span>
+  {% endif %}
+{% endif %}
diff --git a/core/themes/classy/templates/system/element/table.html.twig b/core/themes/classy/templates/system/element/table.html.twig
new file mode 100644
index 0000000..3d0252e
--- /dev/null
+++ b/core/themes/classy/templates/system/element/table.html.twig
@@ -0,0 +1,115 @@
+{#
+/**
+ * @file
+ * Default theme implementation to display a table.
+ *
+ * Available variables:
+ * - attributes: HTML attributes to apply to the <table> tag.
+ * - caption: A localized string for the <caption> tag.
+ * - colgroups: Column groups. Each group contains the following properties:
+ *   - attributes: HTML attributes to apply to the <col> tag.
+ *     Note: Drupal currently supports only one table header row, see
+ *     http://drupal.org/node/893530 and
+ *     http://api.drupal.org/api/drupal/includes!theme.inc/function/theme_table/7#comment-5109.
+ * - header: Table header cells. Each cell contains the following properties:
+ *   - tag: The HTML tag name to use; either TH or TD.
+ *   - attributes: HTML attributes to apply to the tag.
+ *   - content: A localized string for the title of the column.
+ *   - field: Field name (required for column sorting).
+ *   - sort: Default sort order for this column ("asc" or "desc").
+ * - sticky: A flag indicating whether to use a "sticky" table header.
+ * - rows: Table rows. Each row contains the following properties:
+ *   - attributes: HTML attributes to apply to the <tr> tag.
+ *   - data: Table cells.
+ *   - no_striping: A flag indicating that the row should receive no
+ *     'even / odd' styling. Defaults to FALSE.
+ *   - cells: Table cells of the row. Each cell contains the following keys:
+ *     - tag: The HTML tag name to use; either TH or TD.
+ *     - attributes: Any HTML attributes, such as "colspan", to apply to the
+ *       table cell.
+ *     - content: The string to display in the table cell.
+ *     - active_table_sort: A boolean indicating whether the cell is the active
+         table sort.
+ * - footer: Table footer rows, in the same format as the rows variable.
+ * - empty: The message to display in an extra row if table does not have
+ *   any rows.
+ * - no_striping: A boolean indicating that the row should receive no striping.
+ * - header_columns: The number of columns in the header.
+ *
+ * @see template_preprocess_table()
+ *
+ * @ingroup themeable
+ */
+#}
+<table{{ attributes }}>
+  {% if caption %}
+    <caption>{{ caption }}</caption>
+  {% endif %}
+
+  {% for colgroup in colgroups %}
+    {% if colgroup.cols %}
+      <colgroup{{ colgroup.attributes }}>
+        {% for col in colgroup.cols %}
+          <col{{ col.attributes }} />
+        {% endfor %}
+      </colgroup>
+    {% else %}
+      <colgroup{{ colgroup.attributes }} />
+    {% endif %}
+  {% endfor %}
+
+  {% if header %}
+    <thead>
+      <tr>
+        {% for cell in header %}
+          {%
+            set cell_classes = [
+              cell.active_table_sort ? 'active',
+            ]
+          %}
+          <{{ cell.tag }}{{ cell.attributes.addClass(cell_classes) }}>
+            {{- cell.content -}}
+          </{{ cell.tag }}>
+        {% endfor %}
+      </tr>
+    </thead>
+  {% endif %}
+
+  {% if rows %}
+    <tbody>
+      {% for row in rows %}
+        {%
+          set row_classes = [
+            not no_striping ? cycle(['odd', 'even'], loop.index0),
+          ]
+        %}
+        <tr{{ row.attributes.addClass(row_classes) }}>
+          {% for cell in row.cells %}
+            <{{ cell.tag }}{{ cell.attributes }}>
+              {{- cell.content -}}
+            </{{ cell.tag }}>
+          {% endfor %}
+        </tr>
+      {% endfor %}
+    </tbody>
+  {% elseif empty %}
+    <tbody>
+      <tr class="odd">
+        <td colspan="{{ header_columns }}" class="empty message">{{ empty }}</td>
+      </tr>
+    </tbody>
+  {% endif %}
+  {% if footer %}
+    <tfoot>
+      {% for row in footer %}
+        <tr{{ row.attributes }}>
+          {% for cell in row.cells %}
+            <{{ cell.tag }}{{ cell.attributes }}>
+              {{- cell.content -}}
+            </{{ cell.tag }}>
+          {% endfor %}
+        </tr>
+      {% endfor %}
+    </tfoot>
+  {% endif %}
+</table>
diff --git a/core/themes/classy/templates/system/element/tablesort-indicator.html.twig b/core/themes/classy/templates/system/element/tablesort-indicator.html.twig
new file mode 100644
index 0000000..059805f
--- /dev/null
+++ b/core/themes/classy/templates/system/element/tablesort-indicator.html.twig
@@ -0,0 +1,18 @@
+{#
+/**
+ * @file
+ * Default theme implementation for displaying a tablesort indicator.
+ *
+ * Available variables:
+ * - style: Either 'asc' or 'desc', indicating the sorting direction.
+ *
+ * @see template_preprocess_tablesort_indicator()
+ *
+ * @ingroup themeable
+ */
+#}
+{% if style == 'asc' -%}
+  <img src="{{ arrow_asc }}" width="13" height="13" alt="{{ 'sort ascending'|t }}" title="{{ 'sort ascending'|t }}" />
+{% else -%}
+  <img src="{{ arrow_desc }}" width="13" height="13" alt="{{ 'sort descending'|t }}" title="{{ 'sort descending'|t }}" />
+{% endif %}
diff --git a/core/themes/classy/templates/system/element/time.html.twig b/core/themes/classy/templates/system/element/time.html.twig
new file mode 100644
index 0000000..521df56
--- /dev/null
+++ b/core/themes/classy/templates/system/element/time.html.twig
@@ -0,0 +1,28 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a date / time element.
+ *
+ * Available variables
+ * - timestamp: (optional) A UNIX timestamp for the datetime attribute. If the
+ *   datetime cannot be represented as a UNIX timestamp, use a valid datetime
+ *   attribute value in attributes.datetime.
+ * - text: (optional) The content to display within the <time> element. Set
+ *   'html' to TRUE if this value is already sanitized for output in HTML.
+ *   Defaults to a human-readable representation of the timestamp value or the
+ *   datetime attribute value using format_date().
+ * - attributes: (optional) HTML attributes to apply to the <time> element.
+ *   A datetime attribute in 'attributes' overrides the 'timestamp'. To
+ *   create a valid datetime attribute value from a UNIX timestamp, use
+ *   format_date() with one of the predefined 'html_*' formats.
+ * - html: (optional) Whether 'text' is HTML markup (TRUE) or plain-text
+ *   (FALSE). Defaults to FALSE. For example, to use a SPAN tag within the
+ *   TIME element, this must be set to TRUE, or the SPAN tag will be escaped.
+ *   It is the responsibility of the caller to properly sanitize the value
+ *   contained in 'text' (or within the SPAN tag in aforementioned example).
+ *
+ * @see template_preprocess_datetime()
+ * @see http://www.w3.org/TR/html5-author/the-time-element.html#attr-time-datetime
+ */
+#}
+<time{{ attributes.addClass('datetime') }}>{{ html ? text|raw : text }}</time>
diff --git a/core/themes/classy/templates/system/field/field-multiple-value-form.html.twig b/core/themes/classy/templates/system/field/field-multiple-value-form.html.twig
new file mode 100644
index 0000000..f18a853
--- /dev/null
+++ b/core/themes/classy/templates/system/field/field-multiple-value-form.html.twig
@@ -0,0 +1,36 @@
+{#
+/**
+ * @file
+ * Default theme implementation for an individual form element.
+ *
+ * Available variables for all fields:
+ * - multiple: Whether there are multiple instances of the field.
+ *
+ * Available variables for single cardinality fields:
+ * - elements: Form elements to be rendered.
+ *
+ * Available variables when there are multiple fields.
+ * - table: Table of field items.
+ * - description: Description text for the form element.
+ * - button: "Add another item" button.
+ *
+ * @see template_preprocess_field_multiple_value_form()
+ *
+ * @ingroup themeable
+ */
+#}
+{% if multiple %}
+  <div class="form-item">
+    {{ table }}
+    {% if description %}
+      <div class="description">{{ description }}</div>
+    {% endif %}
+    {% if button %}
+      <div class="clearfix">{{ button }}</div>
+    {% endif %}
+  </div>
+{% else %}
+  {% for element in elements %}
+    {{ element }}
+  {% endfor %}
+{% endif %}
diff --git a/core/themes/classy/templates/system/field/field.html.twig b/core/themes/classy/templates/system/field/field.html.twig
new file mode 100644
index 0000000..0745f84
--- /dev/null
+++ b/core/themes/classy/templates/system/field/field.html.twig
@@ -0,0 +1,67 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a field.
+ *
+ * To override output, copy the "field.html.twig" from the templates directory
+ * to your theme's directory and customize it, just like customizing other
+ * Drupal templates such as page.html.twig or node.html.twig.
+ *
+ * Instead of overriding the theming for all fields, you can also just override
+ * theming for a subset of fields using
+ * @link themeable Theme hook suggestions. @endlink For example,
+ * here are some theme hook suggestions that can be used for a field_foo field
+ * on an article node type:
+ * - field--node--field-foo--article.html.twig
+ * - field--node--field-foo.html.twig
+ * - field--node--article.html.twig
+ * - field--field-foo.html.twig
+ * - field--text-with-summary.html.twig
+ * - field.html.twig
+ *
+ * Available variables:
+ * - attributes: HTML attributes for the containing element.
+ * - label_hidden: Whether to show the field label or not.
+ * - title_attributes: HTML attributes for the title.
+ * - label: The label for the field.
+ * - content_attributes: HTML attributes for the content.
+ * - items: List of all the field items. Each item contains:
+ *   - attributes: List of HTML attributes for each item.
+ *   - content: The field item's content.
+ * - entity_type: The entity type to which the field belongs.
+ * - field_name: The name of the field.
+ * - field_type: The type of the field.
+ * - label_display: The display settings for the label.
+ *
+ * @see template_preprocess_field()
+ *
+ * @ingroup themeable
+ */
+#}
+{% set field_name_class = field_name|clean_class %}
+{%
+  set classes = [
+    'field',
+    'field-' ~ entity_type|clean_class ~ '--' ~ field_name_class,
+    'field-name-' ~ field_name_class,
+    'field-type-' ~ field_type|clean_class,
+    'field-label-' ~ label_display,
+    label_display == 'inline' ? 'clearfix',
+  ]
+%}
+{%
+  set title_classes = [
+    'field-label',
+    label_display == 'visually_hidden' ? 'visually-hidden',
+  ]
+%}
+<div{{ attributes.addClass(classes) }}>
+  {% if not label_hidden %}
+    <div{{ title_attributes.addClass(title_classes) }}>{{ label }}</div>
+  {% endif %}
+  <div{{ content_attributes.addClass('field-items') }}>
+    {% for item in items %}
+      <div{{ item.attributes.addClass('field-item') }}>{{ item.content }}</div>
+    {% endfor %}
+  </div>
+</div>
diff --git a/core/themes/classy/templates/system/form/checkboxes.html.twig b/core/themes/classy/templates/system/form/checkboxes.html.twig
new file mode 100644
index 0000000..7c56355
--- /dev/null
+++ b/core/themes/classy/templates/system/form/checkboxes.html.twig
@@ -0,0 +1,17 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a 'checkboxes' #type form element.
+ *
+ * Available variables
+ * - attributes: A list of HTML attributes for the wrapper element.
+ * - children: The rendered checkboxes.
+ *
+ * @see template_preprocess_checkboxes()
+ *
+ * @ingroup themeable
+ */
+ @todo: remove this file once http://drupal.org/node/1819284 is resolved.
+ This is identical to core/modules/system/templates/container.html.twig
+#}
+<div{{ attributes.addClass('form-checkboxes') }}>{{ children }}</div>
diff --git a/core/themes/classy/templates/system/form/confirm-form.html.twig b/core/themes/classy/templates/system/form/confirm-form.html.twig
new file mode 100644
index 0000000..d714917
--- /dev/null
+++ b/core/themes/classy/templates/system/form/confirm-form.html.twig
@@ -0,0 +1,15 @@
+{#
+/**
+ * @file
+ * Default theme implementation for confirm form.
+ *
+ * By default this does not alter the appearance of a form at all,
+ * but is provided as a convenience for themers.
+ *
+ * Available variables:
+ * - form: The confirm form.
+ *
+ * @ingroup themeable
+ */
+#}
+{{ form }}
diff --git a/core/themes/classy/templates/system/form/container.html.twig b/core/themes/classy/templates/system/form/container.html.twig
new file mode 100644
index 0000000..6fb8159
--- /dev/null
+++ b/core/themes/classy/templates/system/form/container.html.twig
@@ -0,0 +1,20 @@
+{#
+/**
+ * @file
+ * Default theme implementation of a container used to wrap child elements.
+ *
+ * Used for grouped form items. Can also be used as a #theme_wrapper for any
+ * renderable element, to surround it with a <div> and HTML attributes.
+ *
+ * Available variables:
+ * - attributes: HTML attributes for the containing element.
+ * - children: The rendered child elements of the container.
+ * - has_parent: A flag to indicate that the container has one or more parent
+     containers.
+ *
+ * @see template_preprocess_container()
+ *
+ * @ingroup themeable
+ */
+#}
+<div{{ attributes.addClass(has_parent ? 'form-wrapper') }}>{{ children }}</div>
diff --git a/core/themes/classy/templates/system/form/dropbutton-wrapper.html.twig b/core/themes/classy/templates/system/form/dropbutton-wrapper.html.twig
new file mode 100644
index 0000000..ca0ff7e
--- /dev/null
+++ b/core/themes/classy/templates/system/form/dropbutton-wrapper.html.twig
@@ -0,0 +1,23 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a dropbutton wrapper.
+ *
+ * Available variables:
+ * - children: Contains the child elements of the dropbutton menu.
+ *
+ * @see template_preprocess()
+ * @see template_preprocess_dropbutton_wrapper()
+ *
+ * @ingroup themeable
+ */
+#}
+{% if children %}
+  {% spaceless %}
+    <div class="dropbutton-wrapper">
+      <div class="dropbutton-widget">
+        {{ children }}
+      </div>
+    </div>
+  {% endspaceless %}
+{% endif %}
diff --git a/core/themes/classy/templates/system/form/fieldset.html.twig b/core/themes/classy/templates/system/form/fieldset.html.twig
new file mode 100644
index 0000000..ab6796c
--- /dev/null
+++ b/core/themes/classy/templates/system/form/fieldset.html.twig
@@ -0,0 +1,47 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a fieldset element and its children.
+ *
+ * Available variables:
+ * - attributes: HTML attributes for the fieldset element.
+ * - required: Boolean indicating whether the fieldeset element is required.
+ * - legend: The legend element containing the following properties:
+ *   - title: Title of the fieldset, intended for use as the text of the legend.
+ *   - attributes: HTML attributes to apply to the legend.
+ * - description: The description element containing the following properties:
+ *   - content: The description content of the fieldset.
+ *   - attributes: HTML attributes to apply to the description container.
+ * - children: The rendered child elements of the fieldset.
+ * - prefix: The content to add before the fieldset children.
+ * - suffix: The content to add after the fieldset children.
+ *
+ * @see template_preprocess_fieldset()
+ *
+ * @ingroup themeable
+ */
+#}
+<fieldset{{ attributes.addClass('form-item', 'form-wrapper') }}>
+  {%
+    set legend_span_classes = [
+      'fieldset-legend',
+      required ? 'form-required',
+    ]
+  %}
+  {#  Always wrap fieldset legends in a SPAN for CSS positioning. #}
+  <legend{{ legend.attributes }}>
+    <span{{ legend_span.attributes.addClass(legend_span_classes) }}>{{ legend.title }}</span>
+  </legend>
+  <div class="fieldset-wrapper">
+    {% if prefix %}
+      <span class="field-prefix">{{ prefix }}</span>
+    {% endif %}
+    {{ children }}
+    {% if suffix %}
+      <span class="field-suffix">{{ suffix }}</span>
+    {% endif %}
+    {% if description.content %}
+      <div{{ description.attributes.addClass('description') }}>{{ description.content }}</div>
+    {% endif %}
+  </div>
+</fieldset>
diff --git a/core/themes/classy/templates/system/form/form-element-label.html.twig b/core/themes/classy/templates/system/form/form-element-label.html.twig
new file mode 100644
index 0000000..6ececd9
--- /dev/null
+++ b/core/themes/classy/templates/system/form/form-element-label.html.twig
@@ -0,0 +1,26 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a form element label.
+ *
+ * Available variables:
+ * - title: The label's text.
+ * - title_display: Elements title_display setting.
+ * - required: An indicator for whether the associated form element is required.
+ * - attributes: A list of HTML attributes for the label.
+ *
+ * @see template_preprocess_form_element_label()
+ *
+ * @ingroup themeable
+ */
+#}
+{%
+  set classes = [
+    title_display == 'after' ? 'option',
+    title_display == 'invisible' ? 'visually-hidden',
+    required ? 'form-required',
+  ]
+%}
+{% if title is not empty or required -%}
+  <label{{ attributes.addClass(classes) }}>{{ title }}</label>
+{%- endif %}
diff --git a/core/themes/classy/templates/system/form/form-element.html.twig b/core/themes/classy/templates/system/form/form-element.html.twig
new file mode 100644
index 0000000..a961801
--- /dev/null
+++ b/core/themes/classy/templates/system/form/form-element.html.twig
@@ -0,0 +1,87 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a form element.
+ *
+ * Available variables:
+ * - attributes: HTML attributes for the containing element.
+ * - prefix: (optional) The form element prefix, may not be set.
+ * - suffix: (optional) The form element suffix, may not be set.
+ * - required: The required marker, or empty if the associated form element is
+ *   not required.
+ * - type: The type of the element.
+ * - name: The name of the element.
+ * - label: A rendered label element.
+ * - label_display: Label display setting. It can have these values:
+ *   - before: The label is output before the element. This is the default.
+ *     The label includes the #title and the required marker, if #required.
+ *   - after: The label is output after the element. For example, this is used
+ *     for radio and checkbox #type elements. If the #title is empty but the
+ *     field is #required, the label will contain only the required marker.
+ *   - invisible: Labels are critical for screen readers to enable them to
+ *     properly navigate through forms but can be visually distracting. This
+ *     property hides the label for everyone except screen readers.
+ *   - attribute: Set the title attribute on the element to create a tooltip but
+ *     output no label element. This is supported only for checkboxes and radios
+ *     in \Drupal\Core\Render\Element\CompositeFormElementTrait::preRenderCompositeFormElement().
+ *     It is used where a visual label is not needed, such as a table of
+ *     checkboxes where the row and column provide the context. The tooltip will
+ *     include the title and required marker.
+ * - description: (optional) A list of description properties containing:
+ *    - content: A description of the form element, may not be set.
+ *    - attributes: (optional) A list of HTML attributes to apply to the
+ *      description content wrapper. Will only be set when description is set.
+ * - description_display: Description display setting. It can have these values:
+ *   - before: The description is output before the element.
+ *   - after: The description is output after the element. This is the default
+ *     value.
+ *   - invisible: The description is output after the element, hidden visually
+ *     but available to screen readers.
+ * - disabled: True if the element is disabled.
+ * - title_display: Title display setting.
+ *
+ * @see template_preprocess_form_element()
+ *
+ * @ingroup themeable
+ */
+#}
+{%
+  set classes = [
+    'form-item',
+    'form-type-' ~ type|clean_class,
+    'form-item-' ~ name|clean_class,
+    title_display not in ['after', 'before'] ? 'form-no-label',
+    disabled == 'disabled' ? 'form-disabled',
+  ]
+%}
+{%
+  set description_classes = [
+    'description',
+    description_display == 'invisible' ? 'visually-hidden',
+  ]
+%}
+<div{{ attributes.addClass(classes) }}>
+  {% if label_display in ['before', 'invisible'] %}
+    {{ label }}
+  {% endif %}
+  {% if prefix is not empty %}
+    <span class="field-prefix">{{ prefix }}</span>
+  {% endif %}
+  {% if description_display == 'before' and description.content %}
+    <div{{ description.attributes }}>
+      {{ description.content }}
+    </div>
+  {% endif %}
+  {{ children }}
+  {% if suffix is not empty %}
+    <span class="field-suffix">{{ suffix }}</span>
+  {% endif %}
+  {% if label_display == 'after' %}
+    {{ label }}
+  {% endif %}
+  {% if description_display in ['after', 'invisible'] and description.content %}
+    <div{{ description.attributes.addClass(description_classes) }}>
+      {{ description.content }}
+    </div>
+  {% endif %}
+</div>
diff --git a/core/themes/classy/templates/system/form/form.html.twig b/core/themes/classy/templates/system/form/form.html.twig
new file mode 100644
index 0000000..2cd1e95
--- /dev/null
+++ b/core/themes/classy/templates/system/form/form.html.twig
@@ -0,0 +1,17 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a 'form' element.
+ *
+ * Available variables
+ * - attributes: A list of HTML attributes for the wrapper element.
+ * - children: The child elements of the form.
+ *
+ * @see template_preprocess_form()
+ *
+ * @ingroup themeable
+ */
+#}
+<form{{ attributes }}>
+  {{ children }}
+</form>
diff --git a/core/themes/classy/templates/system/form/input.html.twig b/core/themes/classy/templates/system/form/input.html.twig
new file mode 100644
index 0000000..1409c25
--- /dev/null
+++ b/core/themes/classy/templates/system/form/input.html.twig
@@ -0,0 +1,15 @@
+{#
+/**
+ * @file
+ * Default theme implementation for an 'input' #type form element.
+ *
+ * Available variables:
+ * - attributes: A list of HTML attributes for the input element.
+ * - children: Optional additional rendered elements.
+ *
+ * @see template_preprocess_input()
+ *
+ * @ingroup themeable
+ */
+#}
+<input{{ attributes }} />{{ children }}
diff --git a/core/themes/classy/templates/system/form/radios.html.twig b/core/themes/classy/templates/system/form/radios.html.twig
new file mode 100644
index 0000000..bf38830
--- /dev/null
+++ b/core/themes/classy/templates/system/form/radios.html.twig
@@ -0,0 +1,15 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a 'radios' #type form element.
+ *
+ * Available variables
+ * - attributes: A list of HTML attributes for the wrapper element.
+ * - children: The rendered radios.
+ *
+ * @see template_preprocess_radios()
+ *
+ * @ingroup themeable
+ */
+#}
+<div{{ attributes.addClass('form-radios') }}>{{ children }}</div>
diff --git a/core/themes/classy/templates/system/form/select.html.twig b/core/themes/classy/templates/system/form/select.html.twig
new file mode 100644
index 0000000..21f32ac
--- /dev/null
+++ b/core/themes/classy/templates/system/form/select.html.twig
@@ -0,0 +1,15 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a select element.
+ *
+ * Available variables:
+ * - attributes: HTML attributes for the select tag.
+ * - options: The option element children.
+ *
+ * @see template_preprocess_select()
+ *
+ * @ingroup themeable
+ */
+#}
+<select{{ attributes }}>{{ options }}</select>
diff --git a/core/themes/classy/templates/system/form/textarea.html.twig b/core/themes/classy/templates/system/form/textarea.html.twig
new file mode 100644
index 0000000..8a8426d
--- /dev/null
+++ b/core/themes/classy/templates/system/form/textarea.html.twig
@@ -0,0 +1,27 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a 'textarea' #type form element.
+ *
+ * Available variables
+ * - wrapper_attributes: A list of HTML attributes for the wrapper element.
+ * - attributes: A list of HTML attributes for the textarea element.
+ * - resizable: An indicator for whether the textarea is resizable.
+ * - required: An indicator for whether the textarea is required.
+ * - value: The textarea content.
+ *
+ * @see template_preprocess_textarea()
+ *
+ * @ingroup themeable
+ */
+#}
+{%
+  set classes = [
+    'form-textarea',
+    resizable ? 'resize-' ~ resizable,
+    required ? 'required',
+  ]
+%}
+<div{{ wrapper_attributes.addClass('form-textarea-wrapper') }}>
+  <textarea{{ attributes.addClass(classes) }}>{{ value }}</textarea>
+</div>
diff --git a/core/themes/classy/templates/system/navigation/block--system-menu-block.html.twig b/core/themes/classy/templates/system/navigation/block--system-menu-block.html.twig
new file mode 100644
index 0000000..dff7e39
--- /dev/null
+++ b/core/themes/classy/templates/system/navigation/block--system-menu-block.html.twig
@@ -0,0 +1,65 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a menu block.
+ *
+ * Available variables:
+ * - plugin_id: The ID of the block implementation.
+ * - label: The configured label of the block if visible.
+ * - configuration: A list of the block's configuration values.
+ *   - label: The configured label for the block.
+ *   - label_display: The display settings for the label.
+ *   - module: The module that provided this block plugin.
+ *   - cache: The cache settings.
+ *   - Block plugin specific settings will also be stored here.
+ * - block - The full block entity.
+ *   - label_hidden: The hidden block title value if the block was
+ *     configured to hide the title ('label' is empty in this case).
+ *   - module: The module that generated the block.
+ *   - delta: An ID for the block, unique within each module.
+ *   - region: The block region embedding the current block.
+ * - content: The content of this block.
+ * - attributes: HTML attributes for the containing element.
+ *   - id: A valid HTML ID and guaranteed unique.
+ * - title_attributes: HTML attributes for the title element.
+ * - content_attributes: HTML attributes for the content element.
+ * - title_prefix: Additional output populated by modules, intended to be
+ *   displayed in front of the main title tag that appears in the template.
+ * - title_suffix: Additional output populated by modules, intended to be
+ *   displayed after the main title tag that appears in the template.
+ *
+ * Headings should be used on navigation menus that consistently appear on
+ * multiple pages. When this menu block's label is configured to not be
+ * displayed, it is automatically made invisible using the 'visually-hidden' CSS
+ * class, which still keeps it visible for screen-readers and assistive
+ * technology. Headings allow screen-reader and keyboard only users to navigate
+ * to or skip the links.
+ * See http://juicystudio.com/article/screen-readers-display-none.php and
+ * http://www.w3.org/TR/WCAG-TECHS/H42.html for more information.
+ *
+ * @ingroup themeable
+ */
+#}
+{%
+  set classes = [
+    'block',
+    'block-menu',
+    'navigation',
+    'menu--' ~ derivative_plugin_id|clean_class,
+  ]
+%}
+{% set heading_id = attributes.id ~ '-menu'|clean_id %}
+<nav{{ attributes.addClass(classes) }} role="navigation" aria-labelledby="{{ heading_id }}">
+  {# Label. If not displayed, we still provide it for screen readers. #}
+  {% if not configuration.label_display %}
+    {% set title_attributes = title_attributes.addClass('visually-hidden') %}
+  {% endif %}
+  {{ title_prefix }}
+  <h2 id="{{ heading_id }}"{{ title_attributes }}>{{ configuration.label }}</h2>
+  {{ title_suffix }}
+
+  {# Menu. #}
+  {% block content %}
+    {{ content }}
+  {% endblock %}
+</nav>
diff --git a/core/themes/classy/templates/system/navigation/breadcrumb.html.twig b/core/themes/classy/templates/system/navigation/breadcrumb.html.twig
new file mode 100644
index 0000000..f6a1705
--- /dev/null
+++ b/core/themes/classy/templates/system/navigation/breadcrumb.html.twig
@@ -0,0 +1,27 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a breadcrumb trail.
+ *
+ * Available variables:
+ * - breadcrumb: Breadcrumb trail items.
+ *
+ * @ingroup themeable
+ */
+#}
+{% if breadcrumb %}
+  <nav class="breadcrumb" role="navigation" aria-labelledby="system-breadcrumb">
+    <h2 id="system-breadcrumb" class="visually-hidden">{{ 'Breadcrumb'|t }}</h2>
+    <ol>
+    {% for item in breadcrumb %}
+      <li>
+        {% if item.url %}
+          <a href="{{ item.url }}">{{ item.text }}</a>
+        {% else %}
+          {{ item.text }}
+        {% endif %}
+      </li>
+    {% endfor %}
+    </ol>
+  </nav>
+{% endif %}
diff --git a/core/themes/classy/templates/system/navigation/menu-local-action.html.twig b/core/themes/classy/templates/system/navigation/menu-local-action.html.twig
new file mode 100644
index 0000000..0eb03a9
--- /dev/null
+++ b/core/themes/classy/templates/system/navigation/menu-local-action.html.twig
@@ -0,0 +1,15 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a single local action link.
+ *
+ * Available variables:
+ * - attributes: HTML attributes for the wrapper element.
+ * - link: A rendered link element.
+ *
+ * @see template_preprocess_menu_local_action()
+ *
+ * @ingroup themeable
+ */
+#}
+<li{{ attributes }}>{{ link }}</li>
diff --git a/core/themes/classy/templates/system/navigation/menu-local-task.html.twig b/core/themes/classy/templates/system/navigation/menu-local-task.html.twig
new file mode 100644
index 0000000..5939203
--- /dev/null
+++ b/core/themes/classy/templates/system/navigation/menu-local-task.html.twig
@@ -0,0 +1,18 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a local task link.
+ *
+ * Available variables:
+ * - attributes: HTML attributes for the wrapper element.
+ * - link: A rendered link element.
+ *
+ * Note: This template renders the content for each task item in
+ * menu-local-tasks.html.twig.
+ *
+ * @see template_preprocess_menu_local_task()
+ *
+ * @ingroup themeable
+ */
+#}
+<li{{ attributes }}>{{ link }}</li>
diff --git a/core/themes/classy/templates/system/navigation/menu-local-tasks.html.twig b/core/themes/classy/templates/system/navigation/menu-local-tasks.html.twig
new file mode 100644
index 0000000..dce922b
--- /dev/null
+++ b/core/themes/classy/templates/system/navigation/menu-local-tasks.html.twig
@@ -0,0 +1,25 @@
+{#
+/**
+ * @file
+ * Default theme implementation to display primary and secondary local tasks.
+ *
+ * Available variables:
+ * - primary: HTML list items representing primary tasks.
+ * - secondary: HTML list items representing primary tasks.
+ *
+ * Each item in these variables (primary and secondary) can be individually
+ * themed in menu-local-task.html.twig.
+ *
+ * @see template_preprocess_menu_local_tasks()
+ *
+ * @ingroup themeable
+ */
+#}
+{% if primary %}
+  <h2 class="visually-hidden">{{ 'Primary tabs'|t }}</h2>
+  <ul class="tabs primary">{{ primary }}</ul>
+{% endif %}
+{% if secondary %}
+  <h2 class="visually-hidden">{{ 'Secondary tabs'|t }}</h2>
+  <ul class="tabs secondary">{{ secondary }}</ul>
+{% endif %}
diff --git a/core/themes/classy/templates/system/navigation/menu.html.twig b/core/themes/classy/templates/system/navigation/menu.html.twig
new file mode 100644
index 0000000..f01ce84
--- /dev/null
+++ b/core/themes/classy/templates/system/navigation/menu.html.twig
@@ -0,0 +1,44 @@
+{#
+/**
+ * @file
+ * Default theme implementation to display a menu.
+ *
+ * Available variables:
+ * - menu_name: The machine name of the menu.
+ * - items: A nested list of menu items. Each menu item contains:
+ *   - attributes: HTML attributes for the menu item.
+ *   - below: The menu item child items.
+ *   - title: The menu link title.
+ *   - url: The menu link url, instance of \Drupal\Core\Url
+ *   - localized_options: Menu link localized options.
+ *
+ * @ingroup themeable
+ */
+#}
+{% import _self as menus %}
+
+{#
+  We call a macro which calls itself to render the full tree.
+  @see http://twig.sensiolabs.org/doc/tags/macro.html
+#}
+{{ menus.menu_links(items, attributes, 0) }}
+
+{% macro menu_links(items, attributes, menu_level) %}
+  {% import _self as menus %}
+  {% if items %}
+    {% if menu_level == 0 %}
+      <ul{{ attributes.addClass('menu') }}>
+    {% else %}
+      <ul class="menu">
+    {% endif %}
+      {% for item in items %}
+        <li{{ item.attributes }}>
+          {{ link(item.title, item.url) }}
+          {% if item.below %}
+            {{ menus.menu_links(item.below, attributes, menu_level + 1) }}
+          {% endif %}
+        </li>
+      {% endfor %}
+    </ul>
+  {% endif %}
+{% endmacro %}
diff --git a/core/themes/classy/templates/system/navigation/pager.html.twig b/core/themes/classy/templates/system/navigation/pager.html.twig
new file mode 100644
index 0000000..a7acd5e
--- /dev/null
+++ b/core/themes/classy/templates/system/navigation/pager.html.twig
@@ -0,0 +1,100 @@
+{#
+/**
+ * @file
+ * Default theme implementation to display a pager.
+ *
+ * Available variables:
+ * - items: List of pager items.
+ *   The list is keyed by the following elements:
+ *   - first: Item for the first page; not present on the first page of results.
+ *   - previous: Item for the previous page; not present on the first page
+ *     of results.
+ *   - next: Item for the next page; not present on the last page of results.
+ *   - last: Item for the last page; not present on the last page of results.
+ *   - pages: List of pages, keyed by page number.
+ *   Sub-sub elements:
+ *   items.first, items.previous, items.next, items.last, and each item inside
+ *   items.pages contain the following elements:
+ *   - href: URL with appropriate query parameters for the item.
+ *   - attributes: A keyed list of HTML attributes for the item.
+ *   - text: The visible text used for the item link, such as "‹ previous"
+ *     or "next ›".
+ * - current: The page number of the current page.
+ * - ellipses: If there are more pages than the quantity allows, then an
+ *   ellipsis before or after the listed pages may be present.
+ *   - previous: Present if the currently visible list of pages does not start
+ *     at the first page.
+ *   - next: Present if the visible list of pages ends before the last page.
+ *
+ * @see template_preprocess_pager()
+ *
+ * @ingroup themeable
+ */
+#}
+{% if items %}
+  <nav class="pager" role="navigation" aria-labelledby="pagination-heading">
+    <h4 id="pagination-heading" class="visually-hidden">{{ 'Pagination'|t }}</h4>
+    <ul class="pager__items">
+      {# Print first item if we are not on the first page. #}
+      {% if items.first %}
+        <li class="pager__item pager__item--first">
+          <a href="{{ items.first.href }}" title="{{ 'Go to first page'|t }}"{{ items.first.attributes }}>
+            <span class="visually-hidden">{{ 'First page'|t }}</span>
+            <span aria-hidden="true">{{ items.first.text|default('« first'|t) }}</span>
+          </a>
+        </li>
+      {% endif %}
+      {# Print previous item if we are not on the first page. #}
+      {% if items.previous %}
+        <li class="pager__item pager__item--previous">
+          <a href="{{ items.previous.href }}" title="{{ 'Go to previous page'|t }}" rel="prev"{{ items.previous.attributes }}>
+            <span class="visually-hidden">{{ 'Previous page'|t }}</span>
+            <span aria-hidden="true">{{ items.previous.text|default('‹ previous'|t) }}</span>
+          </a>
+        </li>
+      {% endif %}
+      {# Add an ellipsis if there are further previous pages. #}
+      {% if ellipses.previous %}
+        <li class="pager__item pager__item--ellipsis" role="presentation">&hellip;</li>
+      {% endif %}
+      {# Now generate the actual pager piece. #}
+      {% for key, item in items.pages %}
+        <li class="pager__item{{ current == key ? ' is-active' : '' }}">
+          {% if current == key %}
+            {% set title = 'Current page'|t %}
+          {% else %}
+            {% set title = 'Go to page @key'|t({'@key': key}) %}
+          {% endif %}
+          <a href="{{ item.href }}" title="{{ title }}"{{ item.attributes }}>
+            <span class="visually-hidden">
+              {{ current == key ? 'Current page'|t : 'Page'|t }}
+            </span>
+            {{- key -}}
+          </a>
+        </li>
+      {% endfor %}
+      {# Add an ellipsis if there are further next pages. #}
+      {% if ellipses.next %}
+        <li class="pager__item pager__item--ellipsis" role="presentation">&hellip;</li>
+      {% endif %}
+      {# Print next item if we are not on the last page. #}
+      {% if items.next %}
+        <li class="pager__item pager__item--next">
+          <a href="{{ items.next.href }}" title="{{ 'Go to next page'|t }}" rel="next"{{ items.next.attributes }}>
+            <span class="visually-hidden">{{ 'Next page'|t }}</span>
+            <span aria-hidden="true">{{ items.next.text|default('next ›'|t) }}</span>
+          </a>
+        </li>
+      {% endif %}
+      {# Print last item if we are not on the last page. #}
+      {% if items.last %}
+        <li class="pager__item pager__item--last">
+          <a href="{{ items.last.href }}" title="{{ 'Go to last page'|t }}"{{ items.last.attributes }}>
+            <span class="visually-hidden">{{ 'Last page'|t }}</span>
+            <span aria-hidden="true">{{ items.last.text|default('last »'|t) }}</span>
+          </a>
+        </li>
+      {% endif %}
+    </ul>
+  </nav>
+{% endif %}