mailspring-mirror/app/static/style/workspace.less

@import 'ui-variables';
@import 'ui-mixins';

:root {
  --font-weight-semi-bold: 600;
}

html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: @font-family;
  font-size: @font-size;
  line-height: @line-height-base;
  -webkit-font-smoothing: antialiased;
  touch-action: manipulation;
}

mailspring-workspace {
  display: block;
  height: 100%;
  overflow: hidden;
  position: relative;
  font-family: @font-family;

  // Important: This attribute is used in the theme-manager-specs to check that
  // themes load and override each other correctly. Do not remove!
  background-color: @background-primary;
}

.sheet-container {
  height: 100%;
}

.sheet {
  background-color: @background-primary;
}

.sheet-stack-enter {
  left: 30px;
  opacity: 0;
  transition: all 0.125s ease-out;
}

.sheet-stack-enter.sheet-stack-enter-active {
  left: 0;
  opacity: 1;
}

.sheet-stack-exit {
  left: 0;
  opacity: 1;
  transition: all 0.125s ease-in;
}

.sheet-stack-exit.sheet-stack-exit-active {
  left: 30px;
  opacity: 0;
}

.toolbar-menu-control {
  display: none;
}

.toolbar-window-controls {
  margin-top: 7px;
  margin-left: @spacing-half /*rtl:ignore */;
  order: -1000 /*rtl: 1000*/;
  min-width: 72px;
  width: 72px;
  flex-grow: 0;
  flex-shrink: 0;

  button {
    -webkit-app-region: no-drag;
    padding: 0;
    width: 12px;
    height: 12px;
    margin: 4px;
    float: left /*rtl:left */;
    background-color: transparent;
    background-repeat: no-repeat;
    background-position: 0 0;
    border: 0;
  }
}

body.is-blurred {
  .sheet-toolbar-container {
    background-image: linear-gradient(
      to bottom,
      lighten(@toolbar-background-color, 14%),
      lighten(@toolbar-background-color, 14%)
    );

    .btn.btn-toolbar {
      background: none;
      box-shadow: 0 0.5px 0 @btn-border-color, 0 -0.5px 0 @btn-border-color,
        0.5px 0 0 @btn-border-color, -0.5px 0 0 @btn-border-color;
      img {
        opacity: 0.5;
      }
    }
    .item-container {
      .window-title {
        opacity: 0.5;
      }
    }
  }
}

.sheet-toolbar-container {
  background-image: -webkit-linear-gradient(
    lighten(@toolbar-background-color, 10%) 0%,
    lighten(@toolbar-background-color, 10%) 1.9%,
    lighten(@toolbar-background-color, 9%) 2%,
    @toolbar-background-color 100%
  );
  color: @text-color-heading;
}

// The nav rail shares the toolbar's surface; each platform block below sets both together.
.nav-rail-frame {
  background: @toolbar-background-color;
}

.sheet-toolbar {
  position: relative;
  -webkit-app-region: drag;
  border-bottom: 1px solid darken(@toolbar-background-color, 9%);
  width: 100%;
  height: 34px;

  // prevent flexbox from ever, ever resizing toolbars, no matter
  // how much it thinks other content is being squished
  min-height: 34px;
  max-height: 34px;

  // cover up the vertical resizing separators, so the toolbar appears
  // to be one continuous bar.
  z-index: 10;

  .item-container > * {
    -webkit-app-region: no-drag;
  }
  .item-spacer {
    -webkit-app-region: drag;
  }

  .item-compose {
    order: 101;
  }

  .item-container {
    .window-title {
      position: absolute;
      text-align: center;
      left: 50%;
      transform: translateX(-50%);
      -webkit-app-region: drag;
      line-height: 34px;
      &:hover {
        cursor: default;
      }
    }
  }

  .item-back {
    order: -999;
    img.content-mask {
      background-color: @text-color-heading;
    }
    flex-grow: 0;
    flex-shrink: 0;

    .item-back-title {
      cursor: default;
      color: @text-color-heading;
      margin: 0;
      font-size: @font-size-h4;
      font-weight: @font-weight-normal;
      vertical-align: middle;
      display: inline-block;
    }
    &:active {
      .item-back-title {
        color: mix(@text-color-heading, @black, 30%);
      }
      img.content-mask {
        background-color: mix(@text-color-heading, @black, 30%);
      }
    }
  }

  .btn-toolbar {
    margin-top: 5px;
    margin-left: @spacing-three-quarters;
    margin-right: 0;
    flex-shrink: 0;
    line-height: 1.75em;
    height: 1.75em;
    box-shadow: 0 0.5px 0.05px rgba(0, 0, 0, 0.4), 0 -0.5px 0 rgba(0, 0, 0, 0.12);
    img.content-mask {
      background-color: fade(@text-color-heading, 80%);
    }
  }
  .btn-toolbar:active {
    img.content-mask {
      background-color: fade(@text-color-heading, 90%);
    }
  }
  .btn-toolbar:only-of-type {
    margin-right: 6px;
  }

  .btn-ghost,
  .btn-bare {
    min-width: 1.75em;
    height: 1.75em;
    margin-top: 5px;
  }
  .btn-ghost:not([aria-pressed='true']) img.content-mask,
  .btn-bare img.content-mask {
    background-color: fade(@text-color-heading, 80%);
  }
  .btn-bare:not(.disabled) {
    &:hover,
    &:focus-visible {
      outline: none;
      img.content-mask {
        background-color: @component-active-color;
      }
    }
  }

  .button-group {
    display: flex;
    margin-left: @spacing-three-quarters;
    .btn.btn-toolbar {
      margin-left: 0;
      margin-right: 0;

      // Using these (slower) selectors to avoid redeclaring any constants
      // like default-case border radius that themes might be overriding.
      &:not(:last-child) {
        border-right: 0;
        border-top-right-radius: 0;
        border-bottom-right-radius: 0;
      }
      &:not(:first-child) {
        border-top-left-radius: 0;
        border-bottom-left-radius: 0;
      }
      &:last-child {
        border-left: 0;
        border-top-left-radius: 0;
        border-bottom-left-radius: 0;
      }
    }
  }
}

.opacity-125ms-enter {
  opacity: 0;
  transition: opacity 0.125s ease-out;
}

.opacity-125ms-enter.opacity-125ms-enter-active {
  opacity: 1;
}

.opacity-125ms-exit {
  opacity: 1;
  transition: opacity 0.125s ease-in;
}

.opacity-125ms-exit.opacity-125ms-exit-active {
  opacity: 0;
}

.flexbox-handle-horizontal {
  width: 8px;
  top: 0;
  bottom: 0;
  z-index: 2;
  position: absolute;
  cursor: col-resize;
  div {
    height: 100%;
    box-shadow: 0.5px 0 0 @border-color-divider;
  }

  &.flexbox-handle-right {
    right: -4px;
    padding-right: 4px;
  }
  &.flexbox-handle-left {
    left: -4px;
    padding-right: 4px;
  }
}

.flexbox-handle-vertical {
  width: 100%;
  height: 6px;
  left: 0;
  right: 0;
  z-index: 2;
  position: absolute;
  cursor: row-resize;
  div {
    width: 100%;
  }
  &.flexbox-handle-top {
    top: -3px;
    padding-right: 3px;
  }
  &.flexbox-handle-bottom {
    bottom: 0;
    padding-right: 2px;
  }
}

.display-deferrable {
  opacity: 1;
  transition: opacity 220ms;
  &.deferred {
    opacity: 0;
  }
}

.injected-region-visible {
  border: 1px dashed rgba(255, 0, 0, 0.5);
  margin: 2px;
  position: relative;
  min-height: 1.5em;
  > .name {
    background-color: rgba(255, 180, 180, 0.9);
    position: absolute;
    color: black;
    font-size: 13px;
    top: 50%;
    left: 50%;
    white-space: nowrap;
    z-index: 100;
    -webkit-transform: translate(-50%, -50%);
    user-select: text;
  }
  &:hover {
    border: 1px dashed rgba(255, 0, 0, 1);
  }
}

// MACOS
// Match the macOS 26+ unified toolbar: a taller bar with capsule-shaped,
// translucent buttons. Grouped buttons share one capsule and are separated by
// hairlines rather than rendered as adjoining rectangles.

// Focused windows get the "glass" treatment: buttons sit slightly brighter than
// the bar, with a light rim inset along the top and bottom edges and a barely
// visible shadow. Blurred windows flatten to a translucent tint with a hairline edge.
@toolbar-btn-fill-darwin: fade(@background-primary, 85%);
@toolbar-btn-fill-hover-darwin: @background-primary;
@toolbar-btn-fill-active-darwin: mix(@text-color, @background-primary, 10%);
@toolbar-btn-edge-darwin: inset 0 1px 0 lighten(@background-primary, 10%),
  inset 0 -1px 0 lighten(@background-primary, 10%), 0 0 0 0.5px fade(@black, 7%),
  0 1px 4px fade(@black, 5%);
@toolbar-btn-fill-blurred-darwin: fade(@text-color, 4%);
@toolbar-btn-edge-blurred-darwin: inset 0 0 0 0.5px fade(@text-color, 12%);
@toolbar-btn-radius-darwin: (@toolbar-btn-height-darwin / 2);

// Traffic-light glyphs shown on hover, drawn as inline SVG so they scale with
// the display and pick up no bitmap blur. Colors are baked in because the
// glyph sits on a fixed-color gumdrop, not on the theme.
@gumdrop-glyph-close: url("data:image/svg+xml;utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M3.6 3.6l4.8 4.8M8.4 3.6l-4.8 4.8' stroke='rgba(0,0,0,0.55)' stroke-width='1.2' stroke-linecap='round'/%3E%3C/svg%3E");
@gumdrop-glyph-minimize: url("data:image/svg+xml;utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M3 6h6' stroke='rgba(0,0,0,0.55)' stroke-width='1.2' stroke-linecap='round'/%3E%3C/svg%3E");
@gumdrop-glyph-fullscreen: url("data:image/svg+xml;utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M3 3v4.8L7.8 3zM9 9V4.2L4.2 9z' fill='rgba(0,0,0,0.55)'/%3E%3C/svg%3E");
@gumdrop-glyph-maximize: url("data:image/svg+xml;utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M6 3v6M3 6h6' stroke='rgba(0,0,0,0.55)' stroke-width='1.2' stroke-linecap='round'/%3E%3C/svg%3E");

// `:where()` adds no specificity, so these platform rules rank exactly like the
// base rules they refine and win only by source order. Themes can then override
// them with ordinary selectors, as they already do for the win32/linux rules.
:where(body.platform-darwin) {
  // macOS 26+ toolbars are a flat surface continuous with the sidebar, with a
  // hairline separating them from content, rather than a gradient bar.
  .sheet-toolbar-container {
    background-image: none;
    background: @panel-background-color;
  }
  .nav-rail-frame {
    background: @panel-background-color;
  }
  .sheet-toolbar {
    border-bottom: 1px solid fade(@text-color, 10%);
  }

  .toolbar-window-controls {
    margin-top: ((@toolbar-height-darwin - 20px) / 2);
    // Size to the buttons rather than stretching to the bar, so the strip
    // below them still drags the window.
    align-self: flex-start;

    // macOS 26+ gumdrops: 14px circles on a 23px pitch.
    button {
      position: relative;
      width: 14px;
      height: 14px;
      margin: 3px 4.5px;
      border-radius: 50%;
      box-shadow: inset 0 0 0 0.5px fade(@black, 15%);
      &::after {
        content: '';
        position: absolute;
        inset: 0;
        background-repeat: no-repeat;
        background-size: 14px 14px;
        opacity: 0;
      }
      &:active {
        filter: brightness(0.8);
      }
    }
    // Colors sit in :where() so a theme's plain `.close` rule outranks them
    // while still ranking above the base `button` rule's transparent fill.
    button:where(.close) {
      background-color: #ff5f57;
    }
    button:where(.minimize) {
      background-color: #febc2e;
    }
    button:where(.maximize) {
      background-color: #28c840;
    }
    .close::after {
      background-image: @gumdrop-glyph-close;
    }
    .minimize::after {
      background-image: @gumdrop-glyph-minimize;
    }
    .maximize::after {
      background-image: @gumdrop-glyph-fullscreen;
    }
    &.alt-true .maximize::after {
      background-image: @gumdrop-glyph-maximize;
    }
    &:hover button::after {
      opacity: 1;
    }
  }

  &.is-blurred {
    .sheet-toolbar-container {
      background-image: none;
      background: @panel-background-color;
    }
    .toolbar-window-controls button {
      background-color: fade(@text-color, 15%);
      box-shadow: inset 0 0 0 0.5px fade(@black, 8%);
    }
  }

  .toolbar-activity {
    padding-top: ((@toolbar-height-darwin - 36px) / 2);
  }

  .sheet-toolbar {
    height: @toolbar-height-darwin;
    min-height: @toolbar-height-darwin;
    max-height: @toolbar-height-darwin;

    .item-container .window-title {
      line-height: @toolbar-height-darwin;
    }

    // Let column toolbars fill the bar so items without a fixed height can be
    // centered with flexbox instead of a line-height tied to the bar height.
    // Scoped to the columns: nested toolbars such as the traffic lights would
    // otherwise overhang the bar and block window dragging below it.
    .sheet-toolbar-container > [role='toolbar'] {
      height: 100%;
    }
    .item-back,
    .message-toolbar-arrow {
      display: flex;
      align-items: center;
      line-height: normal;
    }

    .btn-toolbar {
      // Flex-center the icon: with line-height alone, `vertical-align: middle`
      // lands the glyph about a pixel below the button's center.
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-top: ((@toolbar-height-darwin - @toolbar-btn-height-darwin) / 2);
      height: @toolbar-btn-height-darwin;
      line-height: @toolbar-btn-height-darwin;
      padding: 0 13px;
      border-radius: @toolbar-btn-radius-darwin;
      background: @toolbar-btn-fill-darwin;
      box-shadow: @toolbar-btn-edge-darwin;
      transition: background 120ms ease-out;
      &.narrow {
        padding: 0 10px;
      }
      &:hover {
        background: @toolbar-btn-fill-hover-darwin;
      }
      &:active {
        background: @toolbar-btn-fill-active-darwin;
      }
      &.btn-disabled:hover {
        background: @toolbar-btn-fill-darwin;
      }
    }

    .btn-ghost,
    .btn-bare {
      height: @toolbar-btn-height-darwin;
      min-width: @toolbar-btn-height-darwin;
      margin-top: ((@toolbar-height-darwin - @toolbar-btn-height-darwin) / 2);
    }

    .button-group {
      // Explicit height: as a flex item of a full-height toolbar column the
      // group would otherwise stretch and its outline would hang below the buttons.
      height: @toolbar-btn-height-darwin;
      border-radius: @toolbar-btn-radius-darwin;
      box-shadow: @toolbar-btn-edge-darwin;
      margin-top: ((@toolbar-height-darwin - @toolbar-btn-height-darwin) / 2);
      .btn.btn-toolbar {
        margin-top: 0;
        box-shadow: none;
        &:not(:first-child) {
          border-left: 1px solid fade(@text-color, 10%);
        }
        // Set both ends explicitly: a lone button is also :last-child, which
        // the base rules use to square off the left corners.
        &:first-child {
          border-top-left-radius: @toolbar-btn-radius-darwin;
          border-bottom-left-radius: @toolbar-btn-radius-darwin;
        }
        &:last-child {
          border-top-right-radius: @toolbar-btn-radius-darwin;
          border-bottom-right-radius: @toolbar-btn-radius-darwin;
        }
      }
    }
  }

}

// Kept at the specificity of the generic `body.is-blurred` rule above (which it
// must outrank), so it deliberately does not use the zero-specificity :where().
body:where(.platform-darwin).is-blurred .sheet-toolbar-container {
  .btn.btn-toolbar {
    background: @toolbar-btn-fill-blurred-darwin;
    box-shadow: @toolbar-btn-edge-blurred-darwin;
  }
  .button-group {
    box-shadow: @toolbar-btn-edge-blurred-darwin;
    .btn.btn-toolbar {
      box-shadow: none;
    }
  }
}

// WINDOWS / LINUX
// Toolbar Window Control

body.platform-linux,
body.platform-win32.window-type-default {
  .toolbar-menu-control {
    display: inherit;
    order: 10000 /*rtl: -10000 */;
    .btn-toolbar {
      margin-left: 0;
      padding: 0 17px;
      line-height: 36px;
      img.content-mask {
        vertical-align: middle;
      }
    }
  }
}

// LINUX

body.platform-linux {
  .item-compose {
    order: -101;
  }

  .toolbar-menu-control {
    .btn-toolbar {
      padding: 0 12px;
      line-height: 17px;
    }
  }

  // Flat headerbar in the libadwaita / Yaru style: the toolbar shares the
  // window background, buttons are tinted rather than gradient-filled, and a
  // hairline separates the bar from content.
  .sheet-toolbar-container {
    background-image: none;
    background: @background-primary;
  }
  .nav-rail-frame {
    background: @background-primary;
  }
  .sheet-toolbar {
    border-bottom: 1px solid fade(@text-color, 12%);

    .btn-toolbar {
      background: fade(@text-color, 8%);
      box-shadow: none;
      border-radius: 6px;
      &:hover {
        background: fade(@text-color, 12%);
      }
      &:active {
        background: fade(@text-color, 18%);
      }
    }
    .button-group .btn.btn-toolbar:not(:first-child) {
      border-left: 1px solid fade(@text-color, 10%);
    }
  }

  // linux gumdrops are bigger (15px) and hover states are per-button
  // instead of for the entire set.
  .toolbar-window-controls {
    button {
      width: 15px;
      height: 15px;
      margin: 4px;
      background-size: 15px 60px;
      &:hover {
        background-position: 0 -15px;
      }
      &:active {
        background-position: 0 -30px;
      }
    }
    .close {
      background-image: url('images/application-frame/close-linux.png');
    }
    .minimize {
      background-image: url('images/application-frame/minimize-linux.png');
    }
    .maximize {
      background-image: url('images/application-frame/maximize-linux.png');
    }
    &.alt-true {
      .maximize {
        background-image: url('images/application-frame/maximize-linux.png');
      }
    }
  }

  &.is-blurred {
    .toolbar-window-controls {
      button {
        background-position: 0 -45px;
      }
    }

    .sheet-toolbar-container {
      background-image: none;
      background: @background-primary;
      .btn-toolbar {
        background: fade(@text-color, 5%);
        box-shadow: none;
      }
    }
  }
}

// WINDOWS
// Make things a bit more square

body.platform-win32 {
  .item-compose {
    order: -101;
  }

  .toolbar-window-controls {
    display: none;
  }

  .btn {
    border-radius: 0;
  }

  .flexbox-handle-vertical {
    cursor: ns-resize;
  }
  .flexbox-handle-horizontal {
    cursor: ew-resize;
  }

  .nav-rail-frame {
    background: @background-primary;
  }
  .sheet-toolbar-container {
    background-image: none;
    background: @background-primary;
    .btn-toolbar {
      transition: background 300ms;
      margin: 0 0 0 1px;
      height: 33px;
      padding: 0 14px;
      padding-bottom: 2px;
      border: 0;
      box-shadow: none;
      background: none;
      &:hover {
        background: darken(@list-hover-bg, 5%);
      }
    }
  }

  &.is-blurred {
    .sheet-toolbar-container {
      background-image: none;
      background: @background-primary;
      .btn-toolbar {
        box-shadow: none;
      }
    }
  }
}

// WINDOWS
// The custom font looks blurry, system-ui looks better.
// Segoe UI (system-ui on Windows) doesn't render font-weight: 600 (semi-bold)
// with enough visual distinction from 400 (normal), so we bump to 700 (bold).

body.platform-win32 {
  --font-weight-semi-bold: 700;
  font-family: system-ui;

  mailspring-workspace {
    font-family: system-ui;
  }
}