roundcubemail/skins/elastic/styles/layout.less

@screen-width-large:    1200px;
@screen-width-medium:   1024px;
@screen-width-small:    768px;
@screen-width-xs:       480px;
@screen-width-mini:     320px;

@page-font-size:        14px;
@page-min-width:        240px;

@taskmenu-width:        65px;

/*** Responsive design - Layout ***/

/*
- Desktop - Big screen (width > 1200px)
   -----------------------------------------------------------------------------------------------------
   |  menu  |        sidebar        |         list          |                 content                  |
   -----------------------------------------------------------------------------------------------------
- Desktop - Normal screen (1200px => width => 768px)
   -------------------------------------------------------------------
   |menu|    sidebar/list     |               content                |
   -------------------------------------------------------------------
- Tablet (480px < width < 768px) - typical: 768x1024 (iPad Mini/Air)
   ------------------------------------------
   |menu|     sidebar/list/content          |
   ------------------------------------------
- Phone (width <= 480px) - typical: 320x480 (iPhone 5), 375x667 (iPhone 6-7), 360x564 (Galaxy S6)
   ------------------------
   | sidebar/list/content |
   ------------------------

NOTE: below 1024px we do some UI elements bigger, as this is good (imho)
      assumption that in this size we're dealing with touch device. Is it?
      should we rather feature detect tables/phones?
*/

html {
    height: 100%;
    font-size: @page-font-size;
}

body {
    line-height: 1;
    min-width: @page-min-width;
    height: 100%;
    overflow: hidden;
}

body > #layout {
    overflow: hidden;
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    height: 100%;
    width: 100%;

    & > div {
        &.sidebar,
        &.list {
            display: flex;
            flex-grow: 2;
            flex-direction: column;
            min-width: 300px;
            max-width: 30%;
            border-right: 1px solid @layout-border-color;
        }

        &.content {
            display: flex;
            flex-grow: 6;
            flex-direction: column;
            min-width: 50%;
            background-color: @layout-content-background-color;

            & > iframe,
            & > .content,
            & > .content > iframe {
                height: 100%;
                width: 100%;
                overflow: auto;
                border: 0;
                flex: 1;
            }
        }

        &.sidebar {
            min-width: 220px;
            background-color: @layout-sidebar-background-color;
        }

        &.list {
            min-width: 300px;
            background-color: @layout-list-background-color;
        }

        &.menu {
            width: @taskmenu-width;
            background-color: @taskmenu-background-color;

            a,
            a:before {
                display: block;
                width: @taskmenu-width;
            }
        }

        & > .scroller {
            flex: 1;
        }

        & > .content.only > .scroller {
            overflow: auto;
        }

        & > .header,
        & > .footer {
            background-color: @layout-header-background-color;
            font-size: 1rem;
            font-weight: bold;
            line-height: 2.5rem;
            height: 2.5rem;
            padding: 0 0.25em;
            margin: 0;
            position: relative; /* for absolute positioning of searchbar */
            overflow: hidden;
            white-space: nowrap;
            display: flex;
            flex-direction: row;
            flex-wrap: nowrap;
        }

        & > .header {
            border-bottom: 1px solid #ddd;

            .header-title {
                flex: 1;
                overflow: hidden;
                text-overflow: ellipsis;
            }
        }

        & > .footer {
            border-top: 1px solid #ddd;
        }
    }
}

html.iframe body {
    overflow: auto;

    #content {
        height: 100%;
    }
}


@media screen and (max-width: @screen-width-large) {
    body > #layout > div.sidebar,
    body > #layout > div.list {
        min-width: 260px;
    }
    body > #layout > div:not(.selected),
    body > #layout > div.menu span.inner {
        display: none;
    }
    body > #layout > div.menu,
    body > #layout > div.content {
        display: flex;
    }
    body > #layout > div.menu a,
    body > #layout > div.menu a:before,
    body > #layout > div.menu {
        width: 45px;
    }
    body > #layout > div.menu a:before {
        margin: 0.4em 0;
    }
}

@media screen and (max-width: @screen-width-medium) {
    html:not(.iframe) {
        font-size: 120%;
    }
}

@media screen and (max-width: @screen-width-small) {
    body > #layout > div > .header > .toolbar:not(.searchbar),
    body > #layout > div:not(.selected) {
        display: none;
    }
    body > #layout > div.menu {
        display: flex;
    }
    body > #layout > div.sidebar,
    body > #layout > div.list {
        max-width: 100%;
    }
}

@media screen and (max-width: @screen-width-xs) {
    body > #layout > div.menu span.inner {
        display: block;
    }
    body > #layout > div.menu {
        display: none;
        position: absolute;
        z-index: 100;
        top: 0;
        left: 0;
        right: 0;
        width: auto;
        margin: 38pt 3pt 3pt 3pt;
        padding-bottom: 8pt;
        opacity: 0.96;
        text-align:center;
        border-radius: 4pt;
    }
    body > #layout > div.menu a,
    body > #layout > div.menu a:before {
        display: inline-block;
        width: 100px;
    }
}

@media screen and (max-width: @screen-width-mini) {
    body > #layout > div.sidebar,
    body > #layout > div.list {
        min-width: @page-min-width;
    }
}

@media screen and (min-width: (@screen-width-large + 1px)) {
    body > #layout > div > .header > a.back-list-button,
    body > #layout > div > .header > a.back-sidebar-button {
        display: none;
    }
}

@media screen and (min-width: (@screen-width-small + 1px)) {
    body > #layout > .content > .header > .header-title,
    body > #layout > div > .header > .buttons,
    body > #layout > div > .header > a.toolbar-menu-button {
        display: none;
    }
}

@media screen and (min-width: (@screen-width-xs + 1px)) {
    body > #layout > div > .header > a.menu-button {
        display: none;
    }
}