zulip/web/styles/portico/navbar.css

.nav-zulip-logo {
    background-image: url("data:image/svg+xml,%3Csvg width='108' height='28' viewBox='0 0 108 28' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cg clip-path='url(%23clip0_555_12341234)'%3E%3Cpath d='M25.0534 4.18667C25.0534 5.59714 24.4217 6.85034 23.4589 7.6106L14.1128 15.9802C13.9392 16.1294 13.7136 15.8888 13.8388 15.688L17.267 8.80536C17.3631 8.61266 17.2385 8.37582 17.0414 8.37582H3.7444C1.68498 8.37582 0 6.49104 0 4.18791C0 1.88416 1.68498 6.14715e-07 3.7444 6.14715e-07H21.309C23.3684 -0.00124264 25.0534 1.88353 25.0534 4.18667ZM3.7444 28H21.309C23.3684 28 25.0534 26.1152 25.0534 23.8121C25.0534 21.5083 23.3684 19.6242 21.309 19.6242H8.01203C7.81489 19.6242 7.69029 19.3873 7.78638 19.1946L11.2146 12.312C11.3398 12.1112 11.1142 11.8706 10.9406 12.0198L1.59447 20.3882C0.631713 21.1478 0 22.4016 0 23.8121C0 26.1152 1.68498 28 3.7444 28ZM36.136 20.2825L43.8715 9.11804V9.02107H36.8588V5.97633H48.6431V8.10292L41.0762 19.1225V19.2195H48.764V22.2642H36.136V20.2825V20.2825ZM57.1505 5.97633V15.353C57.1505 18.1559 58.2106 19.5819 60.0909 19.5819C62.0189 19.5819 63.0789 18.2286 63.0789 15.353V5.97633H66.7421V15.1105C66.7421 20.137 64.2116 22.5291 59.97 22.5291C55.8728 22.5291 53.4631 20.2576 53.4631 15.0621V5.97633H57.1505V5.97633ZM72.3333 5.97633H76.0207V19.1704H82.4792V22.2636H72.3333V5.97633ZM90.7454 5.97633V22.2636H87.058V5.97633H90.7454ZM96.3359 6.1939C97.4686 6.00058 99.0593 5.85574 101.3 5.85574C103.566 5.85574 105.181 6.29088 106.265 7.16054C107.301 7.98233 108 9.33561 108 10.9301C108 12.5252 107.47 13.8785 106.506 14.7966C105.253 15.9808 103.397 16.5123 101.228 16.5123C100.747 16.5123 100.313 16.4881 99.9756 16.4396V22.2636H96.3366V6.1939H96.3359ZM99.975 13.5888C100.288 13.6615 100.674 13.6851 101.204 13.6851C103.156 13.6851 104.361 12.6943 104.361 11.0271C104.361 9.52894 103.324 8.63442 101.493 8.63442C100.746 8.63442 100.24 8.70715 99.975 8.77926V13.5888V13.5888Z' fill='white'%3E%3C/path%3E%3C/g%3E%3Cdefs%3E%3CclipPath id='clip0_555_12341234'%3E%3Crect width='108' height='28' fill='white'%3E%3C/rect%3E%3C/clipPath%3E%3C/defs%3E%3C/svg%3E");
    background-repeat: no-repeat;
    width: 108px;
}

.top-menu {
    position: fixed;
    width: 100%;
    background: hsl(240deg 100% 10% / 60%);
    backdrop-filter: blur(10px);
    color: hsl(0deg 0% 100%);
    z-index: 10;
    overflow: hidden;
}

.top-menu-container {
    /*   1280px + 32px for paddings on the edges */
    max-width: 1312px;
    margin: 0 auto;
    display: flex;
    align-items: center;
}

.top-menu-logo {
    overflow: hidden;
    opacity: 0.85;
    /* 14*2 = 28px = height of logo svg */
    padding: 14px;
    margin: 0 16px;
    flex-shrink: 0;
}

.top-menu-items-group-1,
.top-menu-items-group-2 {
    display: flex;
}

.top-menu-items-group-1 {
    margin-right: 32px;
}

.top-menu-item,
.top-menu-mobile a {
    &,
    &:hover,
    &:focus,
    &:visited {
        color: hsl(0deg 0% 100% / 80%);
    }
}

.top-menu-item {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    font-style: normal;
    font-weight: 400;
    font-size: 20px;
    line-height: 28px;
    padding: 14px;
    user-select: none;
    cursor: pointer;
    transition-property: background, color;
    transition-duration: 0.05s;
    transition-timing-function: ease-out;
    color: hsl(0deg 0% 100% / 80%);
}

.top-menu-item:hover {
    color: hsl(0deg 0% 100%);
    background: hsl(240deg 100% 10% / 10%);
    transition-duration: 0.05s;
}

.top-menu-item:active {
    color: hsl(0deg 0% 100%);
    background: hsl(240deg 100% 10% / 20%);
}

.top-menu-item.top-menu-tab,
.top-menu-item.top-menu-tab:hover,
.top-menu-item.top-menu-tab:active {
    opacity: 1;
    background: none;
}

.top-menu-item-spacer {
    flex-shrink: 1;
    flex-grow: 1;
}

.top-menu-item input[type="radio"],
.top-menu-tab-input-unselect {
    display: none;
}

.top-menu-item.top-menu-tab {
    padding: 0;
    position: relative;
    cursor: auto;
}

.top-menu-tab-unselect {
    position: absolute;
    inset: 0;
    z-index: 0;
    cursor: pointer;
}

.top-menu-tab-input:checked + label {
    transition: background, color 0.2s;
    background: hsl(240deg 100% 10% / 60%);
    color: hsl(0deg 0% 100%);
    pointer-events: none;
    user-select: none;
}

.top-menu-tab label {
    padding: 16px;
    cursor: pointer;
    transition-property: background, color;
    transition-duration: 0.1s;
    transition-timing-function: ease-out;
    z-index: 5;
    color: hsl(0deg 0% 100% / 80%);

    /* Override bootstrap */
    margin-bottom: 0;
    font-size: inherit;
    line-height: inherit;
}

.top-menu-tab label::after {
    pointer-events: none;
    content: " ";
    display: inline-block;
    vertical-align: middle;
    width: 16px;
    height: 16px;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='rgba(255%2c255%2c255%2c0.8)' stroke-width='3' stroke-linecap='round' stroke-linejoin='round' class='feather feather-chevron-down'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-size: 16px;
    margin-left: 2px;
    margin-right: -8px;
    background-repeat: no-repeat;
}

.top-menu-tab .top-menu-tab-input:checked + label::after {
    transform: rotate(-180deg);
}

.top-menu-tab .top-menu-tab-input:not(:checked) + label:hover {
    background: hsl(240deg 100% 10% / 10%);
    color: hsl(0deg 0% 100%);
    transition-duration: 0.1s;
}

.top-menu-tab .top-menu-tab-input:not(:checked) + label:active {
    background: hsl(240deg 100% 10% / 20%);
    color: hsl(0deg 0% 100%);
}

.top-menu-tab label.top-menu-tab-user-label::after {
    display: block;
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-45%);
}

.top-menu-tab
    .top-menu-tab-input:checked
    + label.top-menu-tab-user-label::after {
    transform: translateY(-45%) rotate(-180deg);
}

.top-menu-submenu-backdrop {
    background: hsl(240deg 100% 10%);
    opacity: 0;
    height: 0;
    width: 100%;
    transition: all 0.05s;
}

.top-menu-tab-input-unselect:not(:checked) + .top-menu-submenu-backdrop {
    height: 334px;
    opacity: 1;
}

.top-menu-tab-label-unselect {
    position: absolute;
    display: none;
    /* To account for scrollbar if any present. */
    right: 15px;
    top: 60px;
    width: 44px;
    height: 44px;
    background-size: 32px;
    background-repeat: no-repeat;
    /* Close menu icon */
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='rgba(255,255,255,1)' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'%3e%3cline x1='18' y1='6' x2='6' y2='18'%3e%3c/line%3e%3cline x1='6' y1='6' x2='18' y2='18'%3e%3c/line%3e%3c/svg%3e");
    background-position: center;
    cursor: pointer;
    opacity: 0.5;
}

.top-menu-tab-label-unselect:hover {
    opacity: 0.8;
}

.top-menu-tab-label-unselect:active {
    opacity: 1;
}

.top-menu-tab-input-unselect:not(:checked) ~ .top-menu-tab-label-unselect {
    display: block;
}

.top-menu-submenu {
    position: absolute;
    top: 60px;
    display: flex;
    gap: 16px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s;
}

.top-menu-tab .top-menu-tab-user-label {
    max-width: 140px;
    padding-right: 28px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.top-menu-tab-user-img {
    width: 24px;
    height: 24px;
    display: inline;
    vertical-align: middle;
    border-radius: 3px;
    margin-right: 4px;
}

.top-menu-mobile-user-img {
    width: 28px;
    height: 28px;
    display: inline;
    vertical-align: text-top;
    border-radius: 3px;
    margin-right: 4px;
}

@media (width <= 1400px) {
    .top-menu-submenu.singup-column {
        justify-content: flex-end;
        right: 55px;
    }
}

@media (width <= 1170px) {
    .top-menu-tab .top-menu-tab-user-label {
        max-width: 84px;
    }
}

@media (width <= 1024px) {
    .top-menu-tab .top-menu-tab-user-label {
        max-width: 40px;
    }

    .top-menu-tab .top-menu-tab-user-label span {
        display: none;
    }
}

.top-menu-tab-input:checked ~ .top-menu-submenu {
    opacity: 1;
    visibility: visible;
}

.top-menu-submenu-column {
    display: flex;
    flex-direction: column;
    padding-top: 16px;
    flex-shrink: 0;
    max-width: 420px;

    .top-menu-submenu-list {
        margin: 0;
        list-style: none;

        .top-menu-submenu-list-item {
            font-size: 17px;
            font-weight: 400;
            color: hsl(0deg 0% 100% / 90%);
            border-radius: 2px;
            cursor: pointer;

            &:hover {
                background: hsl(0deg 0% 100% / 10%);
            }

            &:active {
                background: hsl(0deg 0% 100% / 20%);
            }

            & a {
                display: block;
                padding: 6px 16px;
                text-decoration: none;
                line-height: 125%;
                color: hsl(0deg 0% 100% / 90%);
            }
        }
    }
}

.top-menu-mobile .top-menu-mobile-item a {
    padding: 10px 10px 10px 53px;
    border-radius: 2px;
    cursor: pointer;
    text-decoration: none;
    display: block;

    &:hover {
        background: hsl(0deg 0% 100% / 10%);
    }

    &:active {
        background: hsl(0deg 0% 100% / 20%);
    }
}

.top-menu-submenu-section {
    padding-left: 16px;
    font-size: 17px;
    opacity: 0.6;
    margin-bottom: 4px;
    letter-spacing: 2px;
}

.top-menu-mobile {
    display: none;
    background: hsl(240deg 100% 10% / 40%);
    backdrop-filter: blur(10px);
    z-index: 20;

    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;

    overflow: auto;
    font-style: normal;
    font-weight: 500;
    font-size: 20px;
    line-height: 28px;
    letter-spacing: 0.02em;
    font-feature-settings: "pnum" on, "lnum" on;
    color: hsl(0deg 0% 100% / 80%);

    transition: all 0.2;
    overscroll-behavior: contain;
}

.top-menu-mobile[open] {
    bottom: 0;
    height: 100%;
    background: hsl(240deg 100% 5.9% / 80%);
    backdrop-filter: blur(20px);
}

.top-menu-mobile-items-group-1,
.top-menu-mobile-items-group-2 {
    display: flex;
    flex-direction: column;
    margin-bottom: 24px;
}

.top-menu-mobile-items-group-1 summary,
.top-menu-mobile-items-group-1 a,
.top-menu-mobile-items-group-2 summary,
.top-menu-mobile-items-group-2 a {
    cursor: pointer;
    transition: background 0.4s ease-out;
}

.top-menu-mobile-items-group-1 summary,
.top-menu-mobile-items-group-2 summary {
    padding: 10px 10px 10px 23px;
    user-select: none;
}

.top-menu-mobile-items-group-1 a,
.top-menu-mobile-items-group-2 a {
    padding-left: 53px;
}

@media (hover: hover) and (pointer: fine) {
    .top-menu-mobile-items-group-1 summary:hover,
    .top-menu-mobile-items-group-2 summary:hover {
        background: hsl(0deg 0% 100% / 10%);
        transition: none;
    }
}

.top-menu-mobile-items-group-1 summary:active,
.top-menu-mobile-items-group-2 summary:active {
    background: hsl(0deg 0% 100% / 10%);
}

.top-menu-mobile-item-summary::marker {
    content: "";
}

.top-menu-mobile-item-summary::before {
    content: "";
    display: inline-block;
    vertical-align: middle;
    margin-top: -4px;
    margin-right: 4px;
    width: 24px;
    height: 24px;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='rgba(255%2c255%2c255%2c0.7)' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' class='feather feather-chevron-down'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    transition: transform 0.12s ease-out;
    transform: rotate(-90deg);
}

.top-menu-mobile details[open] > summary::before {
    transform: rotate(0deg);
}

.top-menu-mobile-submenu {
    display: flex;
    flex-direction: column;
    font-size: 18px;
    margin-bottom: 18px;

    .top-menu-submenu-list {
        margin: 0;
        list-style: none;

        .top-menu-submenu-list-item {
            font-size: 17px;
            font-weight: 400;
            line-height: 26px;
            color: hsl(0deg 0% 100% / 90%);
            border-radius: 2px;
            cursor: pointer;

            &:hover {
                background: hsl(0deg 0% 100% / 10%);
            }

            &:active {
                background: hsl(0deg 0% 100% / 20%);
            }

            & a {
                text-decoration: none;
                padding: 5px 0 5px 53px;
                display: block;
            }
        }
    }
}

.top-menu-mobile-submenu-section {
    letter-spacing: 0.1em;
    color: hsl(0deg 0% 100% / 40%);
    opacity: 0.8;
    text-transform: uppercase;
    margin-top: 8px;
    font-size: 17px;
    padding-left: 53px;
    user-select: none;
    pointer-events: none;
}

.top-menu-mobile-summary {
    cursor: pointer;
    position: sticky;
    top: 0;
    z-index: 1;
    transition: all 0.3s;
    height: 60px;
    overflow: hidden;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.top-menu-mobile-summary:active {
    background: hsl(229deg 47% 17% / 80%);
    backdrop-filter: blur(10px);
}

.top-menu-mobile[open] > .top-menu-mobile-summary {
    background: hsl(229deg 47% 17% / 80%);
    backdrop-filter: blur(10px);
}

/* For browsers which don't support blur */
@supports not (
    (backdrop-filter: blur(10px)) or (-webkit-backdrop-filter: blur(10px))
) {
    .top-menu {
        background: hsl(240deg 100% 10% / 80%);
    }

    .top-menu-mobile {
        background: hsl(240deg 100% 10% / 80%);
    }

    .top-menu-mobile[open] {
        background: hsl(240deg 100% 5.9% / 100%);
    }

    .top-menu-mobile-summary:active {
        background: hsl(229deg 47% 17% / 95%);
    }

    .top-menu-mobile[open] > .top-menu-mobile-summary {
        background: hsl(229deg 47% 17% / 95%);
    }
}

.top-menu-mobile[open] > .top-menu-mobile-summary:active {
    background: hsl(229deg 47% 20% / 100%);
}

.top-menu-mobile-summary::marker {
    content: "";
    display: none;
}

.top-menu-mobile-summary::after {
    display: block;
    height: 32px;
    float: right;
    content: "MENU";
    line-height: 32px;
    color: hsl(0deg 0% 100% / 80%);
    padding-right: 38px;
    font-size: 20px;
    font-weight: 400;
    letter-spacing: 2px;
    margin-right: 16px;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='rgba(255,255,255,0.9)' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'%3e%3cline x1='3' y1='12' x2='21' y2='12'%3e%3c/line%3e%3cline x1='3' y1='6' x2='21' y2='6'%3e%3c/line%3e%3cline x1='3' y1='18' x2='21' y2='18'%3e%3c/line%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-size: 32px;
    background-position: right;
    transition: background, letter-spacing 0.2s;
}

.top-menu-mobile-summary:active::after {
    letter-spacing: 2px;
}

.top-menu-mobile[open] > summary::after {
    content: "Close";
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='rgba(255,255,255,0.9)' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'%3e%3cline x1='18' y1='6' x2='6' y2='18'%3e%3c/line%3e%3cline x1='6' y1='6' x2='18' y2='18'%3e%3c/line%3e%3c/svg%3e");
}

@media (hover: hover) and (pointer: fine) {
    .top-menu-mobile-summary:hover {
        background: hsl(229deg 47% 18% / 100%);
    }

    .top-menu-mobile[open] > .top-menu-mobile-summary:hover {
        background: hsl(229deg 47% 18% / 100%);
    }

    .top-menu-mobile-summary:hover::after {
        letter-spacing: 4px;
    }
}

/* menu responsivity */
@media (width <= 1311px) {
    .top-menu {
        background: hsl(240deg 100% 10% / 50%);
    }

    .top-menu-logo {
        margin-right: 0;
    }

    .top-menu-item {
        padding: 16px 12px;
        font-size: 18px;
        font-weight: 500;
    }
}

@media (width <= 940px) {
    .top-menu {
        display: none;
    }

    .top-menu-logo {
        margin-right: unset;
        display: inline-block;
    }

    .top-menu-mobile {
        display: block;
    }
}