:root {
    --accent-color: #ffdd2d;
    --primary-color: #ffffff;
    --body-background-color: #ffffff;

    --section-title-border-color: rgba(0, 0, 0, 0.2);
    --card-date-color: rgb(128, 128, 128);

    /* no diff */
    --header-color: #222;
    --hero-title-color: #222;
    --hero-link-color: #222;
    --hero-link-hover-color: var(--accent-color);

    --hero-box-border-color: #fff;
    --hero-box-background-start-color: #298dff;
    --hero-box-background-end-color: var(--accent-color);

    --section-title-color: #222;
    --section-title-background-color: rgba(255, 255, 255, 0);

    --tablet-text-color: #333;
    --tablet-text-second-color: #333333;
    --tablet-text-third-color: #333333;
    --tablet-background-color: var(--accent-color);
    --tablet-background-second-color: #e9ecee;
    --tablet-background-third-color: #f1ebd6;

    --card-column-border-color: #222;
    --marker-color: var(--accent-color);

    --card-name-color: #333;
    --card-name-background-color: var(--accent-color);
    --card-span-title-color: #222;

    --stack-content-li-color: #222;
}

body.theme-dark {
    --accent-color: #ffdd2d;
    --primary-color: #e0e0e0;
    --body-background-color: #333333;

    --section-title-border-color: rgba(255, 255, 255, 0.2);
    --card-date-color: #d2d2d2;

    /* no diff */
    --header-color: var(--primary-color);
    --hero-title-color: var(--primary-color);
    --hero-link-color: var(--primary-color);
    --hero-link-hover-color: var(--accent-color);

    --hero-box-border-color: #fff;
    --hero-box-background-start-color: #298dff;
    --hero-box-background-end-color: var(--accent-color);

    --section-title-color: var(--primary-color);
    --section-title-background-color: rgba(255, 255, 255, 0);

    --tablet-background-color: var(--accent-color);

    --card-column-border-color: var(--primary-color);
    --marker-color: var(--accent-color);

    --card-name-color: var(--primary-color);
    --card-name-background-color: var(--accent-color);
    --card-span-title-color: #222;

    --stack-content-li-color: var(--primary-color);
}

*,
::before,
::after {
    box-sizing: border-box;
}

a, a:visited, a:hover, a:active {
    color: inherit;
    text-decoration: underline;
    text-underline-offset: 4px;
}

body {
    margin: 0;
    font-family: 'Montserrat', sans-serif;
    background: var(--body-background-color);
    transition-property: background-color, color;
    transition-duration: 300ms;
}

img {
    width: 100%;
    height: 100%;
}

h1,
h2,
h3 {
    margin: 0;
}


.header {
    width: 100%;
    padding: 15px 0;

    display: flex;
    justify-content: center;
    align-items: center;

    font-size: 24px;
    font-weight: 300;
    color: var(--header-color);
}

.hero {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 30px;
}

.container {
    max-width: 1800px;
    width: 100%;
    margin: 0 auto;
    padding: 0 15px;
}

.hero__container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
    grid-gap: 20px;
    padding: 0 25px;
}


.hero__about {
    display: flex;
    flex-direction: column;
    justify-content: center;
    margin-left: 10px;
}

.hero__title {
    font-size: 56px;
    line-height: 1.1;
    margin-bottom: 20px;
    color: var(--hero-title-color);
}

.hero__subtitle {
    font-size: 36px;
    line-height: 0.3;
    font-weight: 400;
    color: var(--hero-title-color);
}

.hero__description {
    line-height: 2.1;
    font-size: 28px;
    color: var(--hero-title-color);
}

.hero__links {
    display: flex;
}

.hero__link {
    margin-right: 10px;
    font-size: 30px;
    color: var(--hero-link-color);
}

.hero__link:hover {
    color: var(--hero-link-hover-color);
}


.hero__box {
    max-width: 300px;
    justify-self: center;
    overflow: hidden;
    border: 10px solid var(--hero-box-border-color);

    background-image: linear-gradient(
            to right,
            var(--hero-box-background-start-color) 0%,
            var(--hero-box-background-end-color) 100%
    );

    animation: ava-animate 5s infinite alternate;
}


@keyframes ava-animate {
    0% {
        border-radius: 62% 38% 72% 28% / 67% 32% 68% 33%;
    }

    40% {
        border-radius: 37% 63% 53% 47% / 67% 32% 68% 33%;
    }

    60% {
        border-radius: 23% 77% 39% 61% / 78% 54% 46% 22%;
    }

    100% {
        border-radius: 18% 82% 24% 76% / 43% 54% 46% 57%;
    }
}

.columns {
    width: 100%;

    display: flex;
    justify-content: space-around;
}

.left-column {
    width: 50%;
    margin-right: 8px;
}

.right-column {
    width: 50%;
    margin-left: 8px;
}

.experience-container {
    display: flex;
    border-bottom: 2px solid;
    border-color: var(--section-title-border-color);
    justify-content: space-between;
}

#experience-title {
    border-bottom: 0;
}

.section-title {
    padding: 10px 20px 10px 20px;
    font-size: 25px;
    font-weight: bolder;
    color: var(--section-title-color);
    background: var(--section-title-background-color);
    border-bottom: 2px solid;
    border-color: var(--section-title-border-color);
    display: block;
    text-align: start;
    letter-spacing: 1px;
}

.section-content {
    margin: 30px 5px;
    padding-left: 8px;
}

.update-date {
    width: 100%;
    padding: 15px 0;

    display: flex;
    justify-content: center;
    align-items: center;

    font-size: 16px;
    font-weight: 300;
    color: var(--header-color);
}

.tablets {
    display: flex;
    flex-wrap: wrap;
    justify-content: start;
}

.tablet {
    display: inline-block;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: var(--tablet-background-color);
    color: var(--tablet-text-color);
    font-size: 16px;
    padding: 10px 20px;
    border-radius: 24px;
    margin-right: 12px;
    margin-top: 5px;
    margin-bottom: 5px;
}

.tablet-second {
    background: var(--tablet-background-second-color);
    color: var(--tablet-text-second-color);
}

.tablet-third {
    background: var(--tablet-background-third-color);
    color: var(--tablet-text-third-color);
}

.card-column {
    box-sizing: content-box;
    padding: 0 20px;
    border-left: 2px solid;
    border-color: var(--card-column-border-color);
    position: relative;
    margin-bottom: 30px;
    display: flex;
    flex-direction: column;
}

.card-column:before {
    content: "";
    width: 12px;
    height: 12px;
    background: var(--card-column-border-color);
    border-radius: 30%;
    position: absolute;
    top: 0px;
    left: -7px;
}

.stack-content {
    list-style-type: disc;
    margin-top: 4px;
    margin-left: 0px;
    margin-bottom: 8px;
}

.stack-content > li::marker {
    color: var(--marker-color);
}

.stack-content > li {
    margin-top: 8px;
    margin-bottom: 8px;
    color: var(--stack-content-li-color);
    font-size: 16px;
}

.card-container {
    display: flex;
    align-items: center;
    margin-left: 8px;
    margin-bottom: 16px;
}

.card-image {
    object-fit: cover;
    border-radius: 8px;
}

.card-name {
    font-size: 18px;
    color: var(--card-name-color);
    margin-bottom: 0px;
    // background: var(--card-name-background-color);
    font-weight: bold;
    // padding: 10px 16px 10px 16px;
    align: center;
    line-height: 1.5;
    letter-spacing: 1px;
    display: block;
}

.card-span-title {
    display: inline-block;
    background: var(--card-name-background-color);
    color: var(--card-span-title-color);
    border-radius: 4px;
    padding: 10px 16px 10px 16px;
    font-size: 18px;
    // font-weight: bold;
    line-height: 1.5;
    margin-top: 2px;
    margin-bottom: 4px;
    // margin-left: 4px;
}

.card-date {
    display: inline-block;
    color: var(--card-date-color);
    text-align: end;
    font-size: 16px;
    margin-bottom: 0px;
    margin-top: 8px;
    margin-left: 0;
    margin-right: 8px;
}

#experience {
    font-size: 20px;
}

@media screen and (max-width: 978px) {
    .hero {
        padding-top: 30px;
    }

    .hero__container {
        grid-row-gap: 20px;
    }

    .hero__title {
        font-size: 28px;
        margin-bottom: 10px;
    }

    .hero__subtitle {
        font-size: 22px;
        font-weight: 400;
    }

    .hero__description {
        font-size: 14px;
    }

    .hero__about {
        text-align: center;
    }

    .hero__links {
        justify-content: center;
    }

    .hero__box {
        max-width: 350px;
        justify-self: center;
    }

    .columns {
        flex-direction: column;
    }

    .left-column {
        width: 100%;
        margin-right: auto;
    }

    .right-column {
        width: 100%;
        margin-left: auto;
    }

    .tablets {
        justify-content: center;
    }
}

/**/

.theme-switch-wrapper {
    position: absolute;
    padding: 15px 15px;
    top: 0px;
    right: 0px;
    display: flex;
    align-items: center;
}

.theme-switch {
    display: inline-block;
    height: 34px;
    position: relative;
    width: 60px;
}

.theme-switch input {
    display: none;
}

.slider {
    background-color: #ccc;
    bottom: 0;
    cursor: pointer;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
    transition: .4s;
}

.slider:before {
    background-color: #fff;
    bottom: 4px;
    content: "";
    height: 26px;
    left: 4px;
    position: absolute;
    transition: .4s;
    width: 26px;
}

input:checked + .slider {
    background-color: var(--accent-color);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}