:root {
      /* font sizes */
    --text-xs: .75rem;   /* = 0.75(rem) × 16px(base html font size) = 12px */
    --text-sm: .875rem;
    --text-lg: 1.125rem; 
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem; 
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;

    --white-color: #fff;
    --black-color: #111;
    --blue-color: #155DFC;
    --stroke-color: #E8E8E8;
    --gray-dark-color: #555;
    --gray-light-color: #F8FAFC;

    --border-radius: 20px
}

html {
    font-size: 16;
}


body {
   font-family: 'Inter', sans-serif;
   line-height: 1.3;
}


/* input:focus,
textarea:focus,
select:focus {
    outline: none;
}
  
a {
    outline: none;
} */

img {
    display: inline-block;
    max-width: 100%;
    height: auto;
}

/* Text */

.no-border {
    border: none !important;
}


.text-gray {
    color: var(--gray-dark-color);
}

.text-white {
    color: var(--white-color);
}

.text-gradient {
    background: linear-gradient(90deg, var(--blue-color) 0%, #7C00DE 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: all 0.3s ease;
}

.text_small {
    font-size: 14px;
}


.text_big {
    font-size: 20px;
}

.castom-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.castom-list__item {
    margin-bottom: 23px;
}
.castom-list__item:last-child {
    margin-bottom: 0;
}
.castom-list__text {
    position: relative;
    padding-left: 36px;
} 

.castom-list__text::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: url(../images/icons/check.png) no-repeat center center;
    background-size: contain;
}

.gradient-block {
    padding: 95px 20px;
    border-radius: 20px;
    color: var(--white-color);
    background: linear-gradient(90deg, rgba(21, 93, 252, 0.35) 0%, rgba(124, 0, 222, 0.35) 100%), var(--black-color);
}

.gradient-block .section-title {
    margin-bottom: 15px;
}

.gradient-block .text {
    color: var(--stroke-color);
}

.gradient-block__buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 35px;
}

.gradient-block .main-button_transparent {
    background: transparent;
    border: 1px solid #7C00DE;
}

.black-block {
    padding: 60px 50px;
    background-color: var(--black-color);
    border-radius: 20px;
    color: var(--white-color); 
}

.black-block .section-title {
    margin-bottom: 40px;
}

.black-block-items {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.black-block-items .text,
.black-block-items .white-cart__title_small {
    color: var(--black-color);
}

.black-block-item {
    width: calc(33.33333333333333% - 10px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 15px;
    padding: 40px 30px; 
    background-color: var(--white-color);
    border-radius: 20px;
}

.black-block-item_horizontal {
    flex-direction: row;
    gap:25px;
}

.black-block-item_horizontal svg {
    flex-shrink: 0;
}

/* Buttons */
.main-button {
    position: relative;
    display: inline-block;
    padding: 16px 28px;
    border-radius: 1000px;
    border: 2px solid transparent;
    background: linear-gradient(90deg, var(--blue-color) 0%, #7C00DE 100%) border-box;
    text-decoration: none;
    transition: all 0.3s ease;
    text-align: center;
}

.main-button .text-gradient {
    color: var(--white-color);
    background: none;
    -webkit-text-fill-color: var(--white-color);
    transition: all 0.3s ease;
}

.main-button:hover {
    background: 
        linear-gradient(var(--white-color), var(--white-color)) padding-box,
        linear-gradient(90deg, var(--blue-color) 0%, #7C00DE 100%) border-box;
    text-decoration: none;
}

.main-button:hover .text-gradient {
    background: linear-gradient(90deg, var(--blue-color) 0%, #7C00DE 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}


/* Transparent button - inverted states */
.main-button_transparent {
    background: 
        linear-gradient(var(--white-color), var(--white-color)) padding-box,
        linear-gradient(90deg, var(--blue-color) 0%, #7C00DE 100%) border-box;
}

.main-button_transparent .text-gradient {
    background: linear-gradient(90deg, var(--blue-color) 0%, #7C00DE 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.main-button_transparent:hover {
    background: linear-gradient(90deg, var(--blue-color) 0%, #7C00DE 100%) border-box;
}

.main-button_transparent:hover .text-gradient {
    color: var(--white-color);
    background: none;
    -webkit-text-fill-color: var(--white-color);
}


/* Buttons end */

.tag {
    position: relative;
    display: inline-block;
    padding: 4px 14px;
    border-radius: 1000px;
    color: var(--gray-dark-color);
    border: 1px solid var(--stroke-color);
}

.tag_gradient {
    padding: 8px 20px;
    border: 1px solid transparent;
    background: 
        linear-gradient(var(--white-color), var(--white-color)) padding-box,
        linear-gradient(90deg, var(--blue-color) 0%, #7C00DE 100%) border-box;
}

.tag-wrapper {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
}

.tag_white {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 10px 20px;
    background-color: var(--white-color);
    color: var(--black-color);
}

.tag_white-icon {
    width: 18px;
    height: 18px;
    background: url(../images/icons/planet.png) no-repeat center center;
    background-size: contain;
}


.main-title {
    font-size: 80px;
    font-weight: 500;
    line-height: 1;
    text-align: center;
    margin-bottom: 25px;
}

.section {
    padding: 100px 0;
}

.section-title {
    font-size: 48px;
    font-weight: 500;
    line-height: 1;
    margin-bottom: 0;
}

 .logo {
    display: block;
    max-width: 160px;
    text-decoration: none;
}

.logo:hover {
    text-decoration: none;
}

/* Mobile menu */

.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 20px;
    background: var(--black-color);
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    overflow: auto;
}

.mobile-menu.mobile-menu_active {
    opacity: 1;
    visibility: visible;
}


.mobile-menu__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.mobile-menu-close {
    display: inline-block;
    background: transparent;
    border: none;
}

.mobile-menu-list {
    list-style: none;
    padding: 0;
    margin: 40px 0;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.mobile-menu-list__link {
    display: inline-block;
    font-size: 30px;
    font-weight: 500;
    line-height: 1;
    text-decoration: none;
    color: var(--white-color);
    transition: all 0.3s ease;
}

.mobile-menu-list__link:hover {
    color: var(--blue-color);
    text-decoration: none;
}

/* Header */

.header {
    padding: 20px 0;
    box-shadow: 0 1px 4px 0 rgba(12, 12, 13, 0.05);
}

.header-nav {
    padding: 8px;
    border-radius: 1000px;
    border: 1px solid var(--stroke-color);
}

.header-nav-list {
    display: flex;
    gap: 4px;
    margin: 0;
    padding: 0;
}
.header-nav-list__item {
    list-style: none;
}
.header-nav-list__link {
    display: inline-block;
    padding: 6px 16px;
    text-decoration: none;
    color: var(--black-color);
    border-radius: 1000px;
    transition: all 0.3s ease;
}

.header-nav-list__link:hover {
    color: var(--black-color);
    background: var(--stroke-color);
    text-decoration: none;
}

.header-nav-list__link.active {
    color: var(--black-color);
    background: var(--stroke-color);
}

.mobile-menu-button {
    padding: 10px 5px;
    display: none;
}

/* Header end */

/* Carts */

.carts-wrapper {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 60px;
    align-items: stretch;
}

.carts-wrapper__item {
    width: calc(33.33333333333333% - 20px);
}

.white-cart {
    position: relative;
    display: flex;
    flex-direction: column;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 16px 32px -4px rgba(12, 12, 13, 0.05);
    height: 100%;
    background: var(--white-color);
}

.white-cart__title {
    margin-bottom: 26px;
    font-size: 30px;
    font-weight: 500;
}

.white-cart__title_small {
    font-size: 24px;
    font-weight: 500;
}

.white-cart__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.white-cart__number {
    font-size: 48px;
    font-weight: 500;
    line-height: 1;
}

.white-cart__icon {
    width: 48px;
}

.carts-wrapper  .white-cart .main-button {
    margin-top: 20px;
}


/* Carts end */

/* Accordion */

.accordion-item {
    margin-bottom: 10px;
    padding: 25px 35px;
    border-radius: 20px;
    border: 1px solid var(--stroke-color);
    background: var(--white-color);
}

.accordion-item:last-child {
    margin-bottom: 0;
}

.accordion-item__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.accordion-item__icon {
    width: 40px;
    height: 40px;
    background: url(../images/icons/accordion-open-close.png) no-repeat center center;
    background-size: contain;
    cursor: pointer;
    transition: all 0.3s ease;
}

.accordion-item__icon.active {
    transform: rotate(-45deg);
}

.accordion-item__content {
    display: none;
    padding-top: 25px;
}


/* Accordion end */

/* Check list  */

.check-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 30px;
}

.check-list__item {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 22px 30px;
    background-color: var(--white-color);
    border-radius: 20px;
    box-shadow: 0 16px 32px -4px rgba(12, 12, 13, 0.05);
}

.check-list__icon {
    width: 32px;
    height: 32px;
    background: url(../images/icons/check.png) no-repeat center center;
    background-size: contain;
}


/* Main */

.main {
    padding: 100px 0;
    background: url(../images/bg/main-bg.png) no-repeat center center;
    background-size: cover;
}

.main .white-cart {
   padding: 30px;
}

.main-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.main-form_horizontal {
    flex-direction: row;
}

.business-form {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.form-item {
    display: block;
    padding: 16px 30px;
    border-radius: 1000px;
    color: var(--gray-dark-color);
    border: 1px solid var(--gray-dark-color);
}

.form-item.error {
    border-color: red;
}

/* How works platform */

.how-works-platform .white-cart .white-cart__header {
    margin-bottom: 35px;
}

.how-works-platform .white-cart .white-cart__title {
    margin-bottom: 10px;
}

.white-cart .index-first-icon {
    position: absolute;
    bottom: 0;
    right: 0;
    transform: translate(70%, 50%);
    z-index: 1;
}

.white-cart .index-second-icon {
    position: absolute;
    top: 0;
    right: 0;
    transform: translate(70%, -50%);
    z-index: 1;
}

.white-cart .index-first-icon_mobile {
    position: absolute;
    right: -5px;
    bottom: 0;
    transform: translate(0, 58%);
    display: none;
    z-index: 1;
}

.white-cart .index-second-icon_mobile {
    position: absolute;
    left: -5px;
    bottom: 0;
    transform: translate(0, 58%);
    display: none;
    z-index: 1;
}

/* How works platform end */

/* For who */

.for-who {
    background: url(../images/bg/for-who-bg.png) no-repeat center center;
    background-size: cover;
}

.for-who .carts-wrapper {
    margin-top: 40px;
}

.for-who .white-cart .white-cart__header {
    margin-bottom: 50px;
}

.for-who .carts-wrapper__item {
    width: calc(50% - 20px);
}

.for-who .white-cart .white-cart__title {
    margin-bottom: 5px;
}

.for-who .white-cart .castom-list {
    margin-top: 41px;
}


/* Main directions */

.main-directions {
    background: url(../images/bg/main-directions-bg.png) no-repeat center center;
}

/* Why it works */

.why-it-works .carts-wrapper {
    margin-top: 40px;
}


.why-it-works .carts-wrapper__item {
    width: calc(25% - 20px);
}

.why-it-works .white-cart {
    padding: 40px 30px;
    border-left: 3px solid var(--blue-color);
}


.why-it-works .white-cart .white-cart__header {
    margin-bottom: 76px;
}

/* Learning page */ 

/* Learning page main */

.main_learning-page {
    background: url(../images/bg/main-learning-bg.png) no-repeat center center;
    background-size: cover;
}

.main_learning-page .main-title {
    margin: 20px 0;
}

.main_learning-page .text_big {
    margin-bottom: 20px;
}

.main_learning-page .carts-wrapper__item {
    width: 77%;
}

.main_learning-page .white-cart {
    padding: 30px 40px;
}

/* Learning page first section */

.first-section .section-title {
    margin-bottom: 40px;

}

.first-section .carts-wrapper {
    margin-top: 0;
}

.first-section .carts-wrapper__item {
    width: calc(50% - 20px);
}

.first-section .white-cart {
    padding: 30px 25px;
}

.first-section .white-cart .white-cart__header {
    margin-bottom: 35px;
}


/* Learning page how works platform */

.how-works-platform_learning-page .white-cart {
    padding: 40px 27px;
}

.how-works-platform_learning-page .white-cart .white-cart__header {
    margin-bottom: 50px;
}

/* Learning page why it works */

.why-it-works_learning-page .white-cart {
    border: 1px solid var(--blue-color);
    background: linear-gradient(270deg, rgba(124, 0, 222, 0.05) 0%, rgba(21, 93, 252, 0.05) 100%);
}

/* Learning page faq */

.faq {
    background-color: var(--gray-light-color);
}

/* Learning page black block */

.black-block_learning-page .tag-wrapper {
    margin-top: 40px;
}

.black-block_learning-page .black-block-items {
    margin-bottom: 30px;
}

/* Learning page what do you get */

.what-do-you-get {
    background: url(../images/bg/what-do-you-get-bg.png) no-repeat center center;
    background-size: cover;
}

.what-do-you-get_with-form {
    background: url(../images/bg/what-do-you-get-with-form-bg.png) no-repeat center center;
    background-size: cover;
}

.what-do-you-get_with-form .white-cart {
    padding: 30px;
}

.what-do-you-get_with-form .white-cart .white-cart__title {
    margin-bottom: 20px;
}

.what-do-you-get_with-form .white-cart .form-item {
    padding: 14.5px 30px;
}

/* Learning page main ways */

.main-ways {
    background-color: var(--gray-light-color);
}

.main-ways .carts-wrapper {
    margin-top: 40px;
}

.main-ways .carts-wrapper__item {
    width: calc(20% - 20px);
}

.main-ways .white-cart {
    padding: 30px 25px;
    box-shadow: none;
    border-top: 3px solid var(--blue-color);
}

.main-ways .white-cart__header {
    margin-bottom: 120px;
}

/* Learning page end */

/* Business page */

/* Business page main */

.main_business-page {
    background: url(../images/bg/main-business-bg.png) no-repeat center center;
    background-size: cover;
}

.business-first-icon,
.business-second-icon {
    position: absolute;
    top: 55%;
    right: 0;
    transform: translateX(70%);
    z-index: 1;
}

/* Footer */

.footer {
    padding: 50px 0;
    background: url(../images/bg/footer-bg.png) no-repeat center center;
    background-size: cover;
}

.footer .logo {
    max-width: 212px;
    margin-bottom: 30px;
}

.footer-top {
    padding-bottom: 40px;
}

.footer-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-list__item {
    margin-bottom: 12px;
}

.footer-list__item:last-child {
    margin-bottom: 0;
}

.footer-list__link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
    text-decoration: none;
    color: var(--black-color);
    transition: color 0.3s ease;
}

.footer-list__link:hover {
    color: var(--blue-color);
    text-decoration: none;
}

.footer-bottom {
    padding-top: 25px;
    border-top: 1px solid var(--gray-light-color);
}

.footer-bottom__link {
    display: block;
    text-decoration: none;
    color: var(--gray-dark-color);
    transition: color 0.3s ease;
}

.footer-bottom__link:hover {
    color: var(--blue-color);
    text-decoration: none;
}

/* Footer end */

/* Small popup */

.small-popup {
    position: fixed;
    top: 20%;
    left: 50%;
    width: 100%;
    max-width: 500px;
    padding: 30px;
    height: auto;
    transform: translateX(-50%);
    z-index: 1000;
    transition: all 0.3s ease; 
    opacity: 0;
    visibility: hidden;
}

.small-popup.active {
    opacity: 1;
    visibility: visible;
}