.reg-wrapper h2 {
    margin: 0 0 .5rem;
    font-size: clamp(1.5rem, 4vmin, 3rem);
    text-align: center;
    font-size: calc(1.5rem + 1.25cqi);
}
.reg-wrapper p {
    margin: 0 0 var(--margin);
    text-align: center;
}
.reg-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    font-size: 16px;
}
.reg-form__row {
    /* margin: .5rem 0; */
}

.reg-form__row__text {
    display: flex;
    flex-direction: column;
    gap: .25rem;
    position: relative;
}

.reg-form__row__text input {
    padding: .75rem;
    border-radius: .375rem;
    border: 0;
    outline: none;
    border: 1px solid #ccc;
    transition: all .1s ease;
    color: #333;
}

.reg-form__row__checkbox {
    display: flex;
    gap: .5rem;
}

.reg-form__row__text input:focus {
    border-color: #7986cb;
}

.reg-form__row__description {
    /* font-size: 1rem; */
    line-height: 1.2;
}

.reg-form__row__name {
    font-weight: bold;
}

.reg-form {
    margin: 1rem 0;
}

.reg-form__info {
    color: #777;
    font-size: .875em;
}

.reg-form__submit {
    display: inline-block;
    padding: .75rem 1.5rem;
    text-transform: uppercase;
    border: 0;
    border-radius: .5rem;
    background: #3f51b5;
    color: #fff;
}

@media(hover: hover) {
    .reg-form__row__checkbox {
        cursor: pointer;
    }
}
.modal {
    display: flex;
    position: fixed;
    width: 100%;
    top:0;
    left: 0;
    overscroll-behavior: contain;
    z-index: 15;
    transform: translateX(-100%);
    opacity: 0;
    transition: opacity .3s ease, transform .01s ease .35s;
    flex-flow: row wrap;
    align-items: center;
    justify-content: flex-start;
    background: #000000aa;
    height: 100vh;
    height: 100dvh;
    container-type: inline-size;
    padding: 1rem calc(1rem + var(--scroll-width, '0px')) 1rem 1rem;
}
.modal.active {
    transform: translateX(0);
    transition: opacity .5s ease;
    opacity: 1;
    overflow-y: auto;
    overflow-x: hidden;
}
.modal__content {
    max-width: 600px;
    margin: auto;
    background: #f5f5f5;
    color: #333;
    padding: var(--margin);
    border-radius: .5rem;
    transition: all .3s ease;
}
.modal__close-btn__wrapper {
    position: sticky;
    top: 0;
    z-index: 3;
    text-align: right;
}

.modal__close-btn {
    border: none;
    max-width: 48px;
    padding: .5rem .5rem;
    border-radius: 50%;
    background-color: hsl(0, 0%, 90%, 50%);
    display: inline-block;
    transition: background .3s ease, transform .4s ease .2s;
    transform: scale(0);
}

.modal.active .modal__close-btn {
    transform: scale(1);
}

.close-icon {
    max-width: 100%;
    height: auto;
    display: block;
}
/*  .close-icon__line--1 */
.close-icon__line {
    fill: none;
    stroke: #aaa;
    stroke-miterlimit:10;
    /* transition: stroke .3s ease; */
}
.close-icon__circle {
    fill: none;
    stroke: #ccc;
    stroke-width:2px;
    stroke-miterlimit:10;
    stroke-dashoffset: -200;
	stroke-dasharray: 200;
    opacity: 0;
    transition: opacity .2s ease, stroke-dashoffset .3s ease-out .3s;
}

.modal.active .close-icon__circle {
    stroke-dashoffset: 0;
    opacity: 1;
    transition: stroke-dashoffset .8s ease-out .2s;
}

@media (hover: hover) {
    .modal__close-btn:hover {
        background-color: hsl(340, 82%, 45%);
    }
    .modal__close-btn:hover .close-icon__line,
    .modal__close-btn:hover .close-icon__circle {
        stroke: #fff;
    }
}

@media screen and (min-width: 981px) {
    body.modal-active {
        height: 100dvh!important;
        overflow: hidden;
        padding-right: var(--scroll-width, 0)!important;
    }
}

@media screen and (min-width: 720px) {
    .modal__close-btn__wrapper {
        container-type: size;
        width: 100%;
        height: 0;
    }
    .modal__close-btn {
        background-color: hsl(340, 82%, 52%);
        color: #fff;
        display: inline-block;
        transform: scale(0) translate(calc(max(5vmin, 1rem) / 2 + 100%), -50%);
        transform-origin: calc(max(5vmin, 1rem) / 2 + 150%) -25%;
    }
    .modal.active .modal__close-btn {
        transform: scale(1) translate(calc(max(5vmin, 1rem) / 2 + 100%), -50%);
    }
    .close-icon__line,
    .close-icon__circle {
        stroke: #fff;
    }
}


@media screen and (max-width: 560px) {
    .modal {
        background: hsla(0, 0%, 0%, 0.2);
    }
}
:root {
    --margin: max(5vmin, 1rem);
}
* {
    -ms-box-sizing: border-box;
    box-sizing: border-box;
}
html{
    overflow-y: hidden;
}
body {
    overflow-y: scroll;
    font-family: 'Roboto', sans-serif;
    line-height: 1.55;
}
html, body {
    margin: 0;
    padding: 0;
    overscroll-behavior: none;
    height: 100%;
    scroll-behavior: smooth;
}
.wrapper {
    min-height: 100svh;
    max-width: 120ch;
    margin: 0 auto;
    padding: 0 max(5vmin, 1rem);
}
.mobile-menu-toggler__btn {
    display: none;
    position: fixed;
    z-index: 10;
    top:2rem;
    right: 2rem;
    background: #3f51b5;
    color: #fff;
}
.menu-wrapper {
    display: flex;
    position: fixed;
    width: calc(100% - var(--scroll-width, 0));
    top:0;
    overscroll-behavior: contain;
    background: #ffffff11;
    transition: background .3s ease;
    z-index: 5;
}
nav {
    width: 100%;
    display: flex;
    flex-flow: row wrap;
}

.menu_item {
    color: #fff;
    -webkit-text-decoration: none;
    text-decoration: none;
    font-size: clamp(1rem, 2vmin, 1.25rem);
}

.menu_item:nth-child(1) {
     --delay:.05s;
}

.menu_item:nth-child(2) {
     --delay:.1s;
}

.menu_item:nth-child(3) {
     --delay:.15s;
}

.menu_item:nth-child(4) {
     --delay:.2s;
}

.menu_item:nth-child(5) {
     --delay:.25s;
}

.menu_item:nth-child(6) {
     --delay:.3s;
}

.menu_item:nth-child(7) {
     --delay:.35s;
}

p {
    margin: calc(1rem * 1.55) 0;
}

header {
    min-height: 100svh;
    background: url('background.jpg') no-repeat center;
    background-size: cover;
}

:where(header, .presidium, .sponsors-wrapper, .location) img {
    max-width: 100%;
    height: auto;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding-left: max(5vmin, 0.75rem);
    padding-right: max(5vmin, 0.75rem);
    container: inline-size;
    overflow: hidden;
}

.logos {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, calc(150px + 7cqi)));
    align-items: center;
    justify-content: center;
}

.logo-wrapper {
    padding: .75em;
    border-radius: .75em;
    background: #fff;
}

.sponsors {
    overflow: hidden;
    padding-bottom: calc(var(--margin));
}

.sponsors h3 {
    font-size: calc(.875rem + .75cqi);
    line-height: 1.2;
}

.sponsors__sponsor__logo {
    display: block;
    max-width: 300px;
    width: 100%;
    margin: 0 auto;
}

.sponsors__columns {
    display: flex;
    flex-flow: row wrap;
    justify-content: center;
    gap: calc(var(--margin) * 2);
}

.sponsors__columns .sponsors {
    flex: 1 1 calc(50% - var(--margin));
    /* flex-basis: calc(50% - var(--margin)); */
    min-width: 250px;
    align-items: center;
    display: flex;
    flex-flow: row wrap;
    justify-content: center;
    gap: var(--margin);
}

:where(.sponsors) h3 {
    align-self: flex-start;
}

.sponsors__sponsor {
    flex: 1 1 100%
}

.event-info {
    color: #fff;
    display: grid;
    justify-content: center;
    grid-template-areas:
        'micro date'
        'micro location'
    ;
    column-gap: max(3.75vmin,1rem);
    row-gap: 0.5rem;
}

.event-info__icon {
    grid-area: micro;
}

.event-titles {
    color: #fff;
    display: flex;
    flex-direction: column;
}

.event-titles__title {
    font-size: clamp(1.25rem, 6vmin, 4rem);
    font-size: calc(1.25rem +  4cqi);
    margin: 0;
    text-align: center;
    line-height: 1.1;
    order: 2;
}

.event-titles__subtitle {
    text-align: center;
    font-size: clamp(1rem, 2.75vmin, 2rem);
    font-size: calc(1rem + 1cqi);
    margin: 0 0 1rem;
    order: 1;
}

.event-info__date {
    font-size: clamp(1rem, 2.75vmin, 1.75rem);
    grid-area: date;
    align-self: end;
}

.event-info__location {
    font-size: clamp(1rem, 2vmin, 1.25rem);
    grid-area: location;
}

.header--container {
    display: flex;
    flex-flow: column wrap;
    justify-content: space-evenly;
    align-items: center;
    gap: max(7.5vmin, 1rem);
}

.container h1,
.container h2,
.container h3,
.container h4,
.container h5,
.container h6,
.container p {
    margin: 0;
}
.dib {
    display: inline-block;
}

.program-wrapper {
    margin-bottom: calc(var(--margin) * 2);
}
.program {
    line-height: 1.33;
    max-width: 120ch;
    margin: 0 auto;
    font-size: calc(.75rem + .375cqi);
    overflow: hidden;
}

:is(.program, .presidium, .sponsors-wrapper, .location) h2 {
    color: #673ab7;
    margin: calc(var(--margin) * 3) 0 calc(var(--margin) * 2);
    font-size: clamp(1.25rem, 3.5vmin, 2rem);
    font-size: calc(1rem + 2cqi);
    text-align: center;
}
:where(.program, .presidium, .sponsors, .location) h3 {
    /* color: #9b467c; */
    color: #1A237E;
}

.program__item {
    margin-top: calc(var(--margin) / 2);
    padding-bottom: calc(var(--margin) / 2);
    display: grid;
    column-gap: var(--margin);
    grid-template-areas: 'time title' 'time description';
    grid-template-columns: 13ch 1fr;
    grid-template-rows: 1fr max-content;
}

.program__item__title {
    grid-area: title;
    align-self: center;
}

.program__item__time {
    grid-area: time;
    padding: 0.75rem;
    background: #f5f5f5;
    border-radius: 0.5rem;
    display: flex;
    justify-content: center;
}

.program__item__info {
    grid-area: description;
}

.program__item__title + .program__item__info {
    margin-top: calc(var(--margin) / 4);
}

.program__item__info small {
    display: inline-block;
    color: #777;
    margin-top: calc(var(--margin) / 4);
}
.person__academic__rank:before {
    content: '- ';
}

.tac {
    text-align: center;
}
.presidium-wrapper {
    background-image: radial-gradient(ellipse at center, #fff, #f5f5f5);
}
.presidium {
    overflow: hidden;
    padding-bottom: calc(var(--margin) * 2);
}
.presidium__members {
    /* display: grid; */
    display: flex;
    flex-flow: row wrap;
    /* grid-template-columns: repeat(5, minmax(120px, 20vw)); */
    gap: var(--margin);
    justify-content: center;
    color: #333;
}

.presidium__members__member {
    flex: 0 1 max(150px, 15vmax);
}

.presidium__members__member__photo {
    border-radius: 50%;
    border: .125rem solid #1A237E;
    max-width: 70%;
    margin: 0 auto;
    display: block;
}
.presidium__members__member__name {
    text-align: center;
    padding-top: .5rem;
    color: #1A237E;
    white-space: nowrap;
    font-size: calc(.75rem + .375cqi);
}
.presidium__members__member__academic-rank {
    text-align: center;
    font-size: .75em;
    font-size: calc(.5rem + .25cqi);
    color: #777;
    font-weight: 300;
}

.sponsors-wrapper {
    background-image: radial-gradient(#fff, #EDE7F6);
    overflow: hidden;
    padding-bottom: var(--margin);
}

.ya-map {
    width: 100%;
    height: 70vh;
    margin-top: var(--margin);
}

.location__name {
    padding-bottom: calc(var(--margin) / 2);
}
@media screen and (min-width: 981px) {
    nav {
        display: flex;
        justify-content: center;
        gap: max(5vmin, 1rem);
        padding: calc(1rem * 1.55);
    }
    header {
        padding-top: 100px;
    }

    .header--container {
        min-height: calc(100svh - 100px);
    }
    
    .menu-wrapper.solid {
        background: rgb(103 58 183 / 97%);
    }
}
@media screen and (min-width: 1400px) {
    .presidium__members__member {
        flex: 1 1 15%;
    }
}
@media screen and (max-width: 980px) {
    html{
        overflow-y: hidden;
    }
    body {
        overflow-y: scroll;
    }
    .mobile-menu-toggler__btn {
        display: inline-block;
        padding: .5rem;
        border-radius: .5rem;
        background: #3f51b5;
        color: #fff;
        transition: all .3s ease;
        width: auto;
    }
    .menu-wrapper {
        position: fixed;
        transform: translateX(-100%);
        opacity: 0;
        transition: opacity .2s ease, transform .05s linear .25s;
        overflow-y: auto;
        overflow-x: hidden;
        flex-flow: row wrap;
        align-items: center;
        justify-content: flex-start;
        background: #f1f1f1;
        height: 100vh;
        height: 100dvh;
    }
    nav {
        --delay: .2s;
        display: flex;
        gap: max(2.5vmin, .5rem);
        padding: 1rem;
        overflow-y: auto;
        overflow-x: hidden;
    }
    .menu_item {
        display: block;
        text-align: center;
        transform: translateX(-100%);
        opacity: 0;
        transition: none;
        padding: 1rem;
        color: #333;
        font-weight: bold;
        font-size: clamp(1rem, 2vmin, 2.5rem);
        background: #e5e5e5;
        flex: 1 1 100%;
        border-radius: .5rem;
    }
    .menu-wrapper.active {
        transform: translateX(0);
        opacity: 1;
        transition: all .4s ease;
    }

    .menu-wrapper.active .menu_item {
        transform: translateX(0);
        opacity: 1;
        transition: transform .4s ease var(--delay), opacity .4s ease calc( var(--delay) * 1 );
    }
    .header--container {
        min-height: 100svh;
    }
    .program__item {
        grid-template-columns: minmax(14ch, max-content) 1fr;
    }
/*     .presidium__members {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        justify-content: center;
        justify-items: center;
    } */
    .sponsors__sponsor__logo {
        max-width: min(250px, 60vw);
    }
}
@media screen and (max-width: 560px) {
    .event-info {
        grid-template-areas:
            'micro'
            'date'
            'location'
        ;
        row-gap: .5rem;
    }
    .event-info__icon,
    .event-info__date,
    .event-info__location
     {
        text-align: center;
    }
    .program__item {
        grid-template-areas: 'time' 'title' 'description';
        grid-template-columns: 1fr;
        gap: calc(var(--margin) / 4);
        margin-top: calc(var(--margin) / 2);
        padding-bottom: calc(var(--margin) / 2);
    }
    .program__item__time {
        padding: calc(var(--margin) / 2);
        justify-content: start;
    }
    .program__item__title {
        padding-top: calc(var(--margin) / 4);
    }
    .program__item__title + .program__item__info {
        margin-top: 0;
    }
    .program__item__title,
    .program__item__info {
        padding-left: calc(var(--margin) / 2);
    }
}
@media screen and (max-width: 560px) and (orientation: portrait) {
    .mobile-menu-toggler__btn {
        top: auto;
        bottom: 27%;
        right: 5%;
    }
    .mobile-menu-toggler__btn.active {
        bottom: 5%;
        right: 50%;
        transform: translateX(50%);
    }
}
@media screen and (max-width: 560px) and (orientation: portrait) and (max-height: 580px) {
    .menu-wrapper {
        align-items: start;
    }
}
@media (hover: hover) {
    button:hover {
        cursor: pointer;
    }
}