site/_src/_assets/styles/bigchain/_hero.scss

//
// Hero
// ---
// bigchaindb.com
//

$menu-height-md: 90px;

.hero {
    @include background--photo();
    background-image: url('../img/hero-berlin.jpg');
    text-align: center;
    overflow: hidden;
    position: relative;

    // vertically center everything
    display: flex;
    align-items: center;
    min-height: 480px;
    flex-wrap: wrap;

    @media ($screen-md) {
        height: 100vh;
    }

    .hero__title {
        color: #fff;
        font-size: $font-size-h3;
        margin-bottom: $spacer;

        @media ($screen-sm) {
            font-size: $font-size-h2;
        }

        @media ($screen-md) {
            font-size: $font-size-h1;
        }

        &:after { display: none; }
    }

    .hero__subtitle {
        font-size: $font-size-h4;
        margin-top: 0;

        @media ($screen-sm) {
            font-size: $font-size-h3;
        }
    }

    .section-subtitle {
        font-size: $font-size-h4;

        @media ($screen-sm) {
            font-size: $font-size-h3;
        }

        @media ($screen-md) {
            font-size: $font-size-h2;
        }
    }
}


//
// intro animation
//
.hero__title,
.hero__subtitle,
.hero__action,
.logo-services {
    .wf-active &,
    .wf-inactive & {
        @include animation-slide-in-from-bottom;
        animation-fill-mode: backwards;
    }
}

.hero__subtitle {
    .wf-active &,
    .wf-inactive & {
        animation-delay: .3s;
    }
}

.hero__action {
    .wf-active &,
    .wf-inactive & {
        animation-delay: .5s;
    }
}

.page-front .menu--main,
.hero__community,
.hero__more {
    @include transition;
    opacity: 0;
    transition-delay: .8s;

    .wf-active &,
    .wf-inactive & {
        opacity: 1;
    }
}


.hero__content {
    margin-top: $spacer * 2;
    margin-bottom: $spacer * 4;

    @media ($screen-md) {
        align-self: flex-start;
        margin-top: $spacer * 4;
        margin-bottom: 0;
    }
}


.hero__community {
    align-self: flex-end;
    width: 100%;

    // resemble menu background, but a bit darker background
    background: rgba($brand-main-blue-dark, .6);
    backdrop-filter: saturate(150%) blur(10px);
    border-top: 1px solid rgba($brand-main-gray, .5);
    border-bottom: 1px solid rgba($brand-main-gray, .5);

    .btn {
        font-weight: $font-weight-normal;
        box-shadow: none;
        background: none;
        opacity: .95;

        &:hover,
        &:focus {
            opacity: 1;
        }

        &:first-child {
            display: block;

            @media ($screen-sm) {
                display: inline-block;
            }
        }

        &:visited {
            .release:after {
                // make it appear hidden by changing background-color
                // cause modifiying display is not allowed for :visited
                background-color: rgb(15, 40, 56);
            }
        }

        .icon {
            transform: translateY(1px);
        }
    }

    .stars,
    .release,
    .meetup-title {
        display: inline-block;
        opacity: 0;
        transition: opacity .2s ease-out;
    }

    strong {
        font-weight: $font-weight-normal;
    }

    .stars {
        font-size: .6rem;
        background: rgba($brand-main-gray-lighter, .15);
        padding: .1rem .3rem;
        border-radius: 1rem;
        display: inline-block;
        transform: translateY(-1px);
        min-width: 34px; // approx. width with 4 numbers
    }

    .release {
        min-width: 44px;

        &:after {
            content: '';
            display: inline-block;
            width: .35rem;
            height: .35rem;
            border-radius: 50%;
            background-color: saturate(adjust-hue($brand-main-green, -170%), 15%);
            vertical-align: top;
            margin-left: $spacer / 8;
        }
    }

    .icon {
        margin-right: .1rem;
    }

    .icon--gitter {
        animation: gitterPulse 5s ease-out infinite;
        stroke-linecap: square;
        stroke-width: 2px;
        fill: none;
    }
}

@keyframes gitterPulse {
    0% {
        stroke: $brand-main-gray-light;
    }

    50% {
        stroke: $brand-main-green;
    }

    100% {
        stroke: $brand-main-gray-light;
    }
}

.hero__community__label {
    opacity: .5;
}


.hero__more {
    position: relative;
    z-index: 2;
    color: rgba(#fff, .6);
    align-self: flex-end;
    margin-bottom: $spacer;
    width: 100%;
    display: none;

    @media ($screen-md) {
        display: block;
    }

    &:hover,
    &:focus { color: #fff; }

    // the caret
    .icon {
        width: 12px;
        height: 12px;
        stroke: #fff;
        display: block;
        margin: auto;
    }
}