@import url("https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&family=Source+Code+Pro&display=swap");

:root {
  --bg-color-first: #181818;
  --bg-color-second: #1f1f1f;
  --bg-color-third: #1e1e1e;
  --bg-color-forth: #2a2a2a;

  --font-color-first: #ffffff;
  --font-color-second: #e0e0e0;
  --font-color-third: #eeeeee;
  --font-color-forth: #666666;
  --font-color-fifth: #828282;
  --font-color-sixth: #bbbbbb;

  --font-code-white: #dddddd;
  --font-code-blue: #569cd6;
  --font-color-green: #3ecf8e;

  --color-white: #ffffff;
  --color-green-first: #24b47e;
  --color-blue-first: #1374ef;
  --color-blue-second: #4299e1;
  --color-blue-third: rgba(49, 130, 206, 0.1);
  --color-transparent: rgba(0, 0, 0, 0);

  --border-color-first: #2a2a2a;
  --border-color-second: #666666;

  --body-font: "Roboto", sans-serif;
  --code-font: "Source Code Pro", monospace;

  --text-xxl: 48px;
  --text-xl: 36px;
  --text-2l: 18px;
  --text-l: 16px;
  --text-m: 14px;
  --text-s: 13px;
  --text-xs: 12px;
  --text-xxs: 11px;
  --text-xxxs: 10px;
}

* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--body-font);
  font-weight: 400;
  line-height: 1.2;
  background-color: var(--bg-color-first);
  color: var(--font-color-first);
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-text-size-adjust: 100%;
}

ul {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  opacity: 0.8;
}

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

h1 {
  font-size: var(--text-xl);
  font-weight: 700;
}

h2 {
  font-size: var(--text-xl);
  font-weight: 400;
}

h3 {
  font-size: var(--text-2l);
  font-weight: 400;
}

h4 {
  font-size: var(--text-l);
  font-weight: 400;
}

h5 {
  font-size: var(--text-m);
  font-weight: 400;
}

p {
  font-size: var(--text-m);
  color: var(--font-color-second);
  line-height: 150%;
}

/*===================== utils ====================*/
.button {
  margin: 20px 0;
  padding: 9px 17px;
  color: var(--font-color-first);
  border: none;
  border-radius: 4px;
  box-shadow: 0px 2px 0px rgba(0, 0, 0, 0.043);
  cursor: pointer;
}

.button:hover {
  opacity: 0.8;
}

.button_green {
  background-color: var(--color-green-first);
}

.button_blue {
  background-color: var(--color-blue-first);
}

.button_transparent {
  background-color: var(--color-transparent);
}

.button_transparent:hover {
  background-color: var(--bg-color-forth);
}

.container {
  margin: 10px auto;
  padding: 0 20px;
}

.container__right-col {
  margin-top: 36px;
}

.feature__nav-container {
  display: flex;
  flex-wrap: wrap;
}

.feature__nav-el {
  padding: 7px 12px;
  margin-bottom: 17px;
  margin-right: 4px;
  display: block;
  color: var(--font-color-forth);
  font-size: var(--text-s);
  box-shadow: 0px 2px 0px rgba(0, 0, 0, 0.043);
  border-radius: 4px;
}

.feature__nav-el:hover {
  background-color: var(--bg-color-forth);
  color: var(--font-color-second);
}

.feature__nav-el_active {
  background-color: var(--bg-color-forth);
  color: var(--font-color-first);
}

.feature__dummy-pic {
  border: 1px solid var(--border-color-first);
  border-radius: 8px;
}

.icon-box__container {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background-color: var(--color-white);
}

.icon-box__icon {
  display: block;
}

/*=============== Header and nav =================*/

.header__logo-container {
  height: 10vh;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--bg-color-first);
  padding: 40px 20px 20px 20px;
  position: fixed;
  width: 100%;
  top: 0;
  left: 0;
}

.header__logo {
  width: 123px;
  height: 24px;
  display: block;
}

.header__hamb-icon {
  width: 50px;
  height: 50px;
  border: none;
  background-color: transparent;
}

.header__hamb-icon_open {
  background-image: url(../img/header__hamb-icon.svg);
}

.header__hamb-icon_close {
  background-image: url(../img/header__close-icon.svg);
}

.header__nav {
  padding-bottom: 18px;
  position: fixed;
  width: 100%;
  left: -100%;
  top: 0;
  margin-top: 10vh;
  background-color: var(--bg-color-first);
  transition: left 0.5s;
}

.header__nav_show {
  left: 0;
  transition: all 0.5s;
}

.header__nav-el {
  margin-top: 8px;
  margin-left: 24px;
  font-size: var(--text-xl);
  color: var(--font-color-third);
  cursor: pointer;
}

.header__button {
  margin-left: 20px;
  display: block;
  padding: 7px 11px;
}
/*=================== Hero =======================*/

.hero {
  margin-top: 20vh;
}

.hero__miniheader {
  display: none;
}

.hero__miniheader-text {
  margin-left: 12px;
}

.hero__h1 {
  margin-top: 27px;
  margin-bottom: 60px;
}

.hero__text {
  margin-top: 16px;
  line-height: 200%;
}

/*=================== Feature_1 ==================*/

.feature-1 {
  margin: 96px 0;
}

.feature-1__column {
  margin: 96px 0;
}

.feature-1__column-miniheader {
  margin: 12px 0;
  display: flex;
  align-items: center;
}

.feature-1__icon-box {
  margin-right: 8px;
}

.feature-1__icon-box_accent {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background-color: var(--color-white);
}

.feature-1__icon {
  display: block;
}

.feature-1__column-p {
  margin-top: 26px;
  color: var(--font-color-second);
  font-size: var(--text-2l);
}

/*=================== Feature_2 ==================*/

.feature-2 {
  margin: 48px 0;
}

.feature-2__header-el {
  margin: 22px 0;
}

.feature-2__header-el_grey {
  color: var(--font-color-second);
}

.feature-2__container {
  padding-top: 64px;
  padding-bottom: 64px;
}

.feature-2__right {
  margin-top: 64px;
}

.feature-2__p-large {
  margin-top: 21px;
  font-size: var(--text-l);
  color: var(--font-color-second);
}

.feature-2__header-2 {
  margin-top: 48px;
  font-size: var(--text-2l);
}

.feature-2__card {
  margin-top: 16px;
  margin-bottom: 21px;
  padding: 21px 21px 31px 21px;
  background-color: var(--bg-color-second);
  border-top: 1px solid var(--border-color-first);
}

.feature-2__card-p {
  margin-top: 12px;
  color: var(--font-color-second);
  font-size: var(--text-s);
}

.feature-2__card-footer {
  margin-top: 13px;
  display: flex;
  align-items: center;
}

.feature-2__card-footer-info {
  display: block;
}

.feature-2__card-icon {
  margin-left: 8px;
  margin-right: 8px;
  display: block;
}

.feature-2__card-2 {
  padding: 0 21px;
  border-bottom: 1px solid var(--border-color-first);
}

.feature-2__card-2-header {
  display: flex;
  align-items: center;
}

.feature-2__button-container {
  margin-top: 12px;
}

.feature-2__github-icon {
  margin-left: 6px;
  display: block;
}

/*=================== Feature_3 ==================*/

.feature-3__p1 {
  margin-top: 12px;
}

.feature-3__p2 {
  margin-top: 19px;
}

.feature-3__cards-container {
  margin-top: 80px;
}

.feature-3__card {
  margin-top: 36px;
}

.feature-3__card-h {
  margin-top: 20px;
}

.feature-3__card-p {
  margin-top: 19px;
}

.feature-3__button {
  margin-top: 16px;
  padding: 2px 10px;
  background-color: var(--color-blue-third);
  color: var(--color-blue-second);
  border-radius: 100px;
}

/*=================== Feature_4 ==================*/

.feature-4 {
  margin-top: 90px;
}

.feature-4__p-1 {
  margin-top: 21px;
}

.feature-4__p-2 {
  margin-top: 42px;
}

.feature-4__action-link {
  width: 205px;
  margin-top: 29px;
  margin-bottom: 29px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 13px;
  background-color: var(--border-color-first);
  border: 1px solid #2a2a2a;
  box-shadow: 0px 2px 0px rgba(0, 0, 0, 0.043);
  border-radius: 4px;
}

.feature-4__action-link:hover {
  opacity: 0.8;
}

.feature-4__action-icon {
  display: block;
}

.feature-4__action-text {
  display: block;
  font-size: var(--text-m);
}

.feature-4__card {
  width: 528px;
  height: 311px;
  border: 1px solid var(--border-color-first);
  border-radius: 8px;
}

.feature-4__card-header {
  margin-top: 32px;
  margin-left: 33px;
}

.feature-4__card-p {
  margin-top: 16px;
  margin-left: 32px;
  font-size: var(--text-m);
  color: var(--font-color-forth);
}

/*=================== Action ==================*/

.action {
  padding-top: 128px;
  padding-bottom: 128px;
}

.action__left {
  display: block;
  width: fit-content;
  margin-top: 100px;
  margin-left: auto;
  margin-right: auto;
  font-size: var(--text-2l);
  color: var(--font-color-sixth);
}

.action__right {
  display: block;
  width: fit-content;
  margin: 26px auto;
  font-size: var(--text-2l);
  color: var(--font-color-first);
}

.action__button {
  padding: 11px 20px;
  display: block;
  margin: 56px auto;
  width: fit-content;
  font-size: var(--text-m);
}

/*================== Footer ======================*/

.footer {
  margin-top: 42px;
  padding-top: 48px;
  padding-bottom: 48px;
}

.footer__logo-block {
  display: flex;
  justify-content: space-between;
}

.footer__logo-block-right {
  display: flex;
}

.footer__logo-link {
  display: block;
  margin-left: 28px;
}

.footer__nav {
  font-size: var(--text-2l);
}

.footer__nav-col {
  margin-top: 36px;
}

.footer__nav-col-header {
  margin: 19px 0;
  display: block;
  color: var(--font-color-forth);
}

.footer__nav-col-link {
  margin: 12px 0;
  display: block;
  color: var(--font-color-third);
}

.footer__bottom {
  margin-top: 120px;
  padding-top: 28px;
  border-top: 1px solid var(--border-color-first);
}

.footer__copyrights {
  margin-left: 8px;
  font-size: var(--text-l);
  color: var(--font-color-forth);
}

.footer__dark-switcher {
  margin-top: 39px;
  display: flex;
}

.footer__dark-el {
  display: block;
  margin-right: 23px;
}

/* ======================================================= */
/* ================ responsive design ==================== */
/* ======================================================= */

@media screen and (min-width: 768px) {
  .container {
    padding: 0 48px;
  }

  /*====================== 768 Header and nav ============ */

  .header__logo-container {
    padding: 48px;
  }

  .header__nav-el {
    margin-left: 48px;
    font-size: var(--text-2l);
    cursor: pointer;
  }

  .header__button {
    margin-left: 48px;
  }

  /* ===================== 768 Hero ====================== */

  .hero__miniheader {
    display: flex;
    align-items: baseline;
  }

  /* ===================== 768 Feature-1 ================= */
  /* ===================== 768 Feature-2 ================= */
  /* ===================== 768 Feature-3 ================= */

  .feature-3__cards-container {
    display: flex;
  }

  .feature-3__card {
    margin-right: 105px;
  }

  /* ===================== 768 Feature-4 ================= */
  /* ===================== 768 Action ==================== */

  .action {
    margin-top: 112px;
    padding-top: 128px;
    padding-bottom: 128px;
  }
  
  .action__header-container {
    margin: 0 auto;
    width: fit-content;
    display: flex;
    align-items: center;
  }

  .action__left {
    margin: 0;
  }

  .action__right {
    margin: 0 0 0 7px;
  }
  
  /* ===================== 768 Footer ==================== */

  .footer__nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer__bottom {
    padding-bottom: 102px;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .footer__dark-switcher {
    margin-top: 12px;
  }

  .footer__dark-el {
    margin-right: 0;
    margin-left: 23px;
}

}

@media screen and (min-width: 1024px) {
  .container {
    padding: 0;
    max-width: 960px;
  }

  .container__right-col {
    margin-top: 0;
  }

  .feature__nav-el {
    margin-right: 8px;
    font-size: var(--text-xxs);
  }

  /*====================== 1024 Header and nav ============ */

  .header {
    width: 100%;
    height: 65px;
    position: fixed;
    top: 0;
    background-color: var(--bg-color-first);
  }

  .header__container {
    display: flex;
    align-items: center;
  }

  .header__logo-container {
    display: block;
    padding: 0;
    position: relative;
    width: auto;
    height: auto;
    top: auto;
    left: auto;
  }

  .header__hamb-icon {
    display: none;
  }

  .header__nav {
    padding-bottom: 0;
    position: relative;
    width: 100%;
    left: auto;
    top: auto;
    margin-top: 0;
    margin-left: 44px;
    display: flex;
    justify-content: space-between;
  }

  .header__nav-list {
    display: flex;
  }

  .header__nav-el {
    margin-top: 8px;
    margin-left: 24px;
    font-size: var(--text-l);
  }

  .header__action {
    display: flex;
  }

  .header__button {
    margin-top: 0;
    margin-bottom: 0;
    margin-left: 14px;
  }

  /* ===================== 1024 Hero ====================== */

  .hero {
    margin-top: 193px;
  }

  .hero__container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 39px;
  }

  /* ===================== 1024 Feature-1 ================= */

  .feature-1 {
    margin: 0;
  }

  .feature-1__container {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 255px));
    gap: 120px;
  }

  .feature-1__column {
    margin: 60px 0;
  }

  /* ===================== 1024 Feature-2 ================= */

  .feature-2__container {
    margin-top: 64px;
    display: grid;
    grid-template-columns: minmax(0, 558fr) minmax(0, 373fr);
    gap: 64px;
  }

  .feature-2__right {
    margin-top: 0;
  }

  /* ===================== 1024 Feature-3 ================= */

  .feature-3__container {
    margin-top: 160px;
    display: grid;
    grid-template-columns: minmax(0, 439fr) minmax(0, 526fr);
    gap: 64px;
  }

  .feature-3__cards-container {
    justify-content: space-between;
  }

  .feature-3__card {
    width: 167px;
    margin: 0;
  }

  /* ===================== 1024 Feature-4 ================= */

  .feature-4__container {
    display: grid;
    grid-template-columns: minmax(0, 439fr) minmax(0, 526fr);
    gap: 64px;
  }

  /* ===================== 1024 Action ==================== */
  /* ===================== 1024 Footer ==================== */

  .footer__nav {
    font-size: var(--text-m);
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .footer__nav-col-header {
    margin: 0 0 24px 0;
    display: block;
    color: var(--font-color-forth);
}
}

@media screen and (min-width: 1280px) {
  .container {
    max-width: 1120px;
  }

  h1 {
    font-size: var(--text-xxl);
  }

  h2 {
    font-size: var(--text-xxl);
  }

  h3 {
    font-size: var(--text-xl);
  }

  h4 {
    font-size: var(--text-2l);
  }

  h5 {
    font-size: var(--text-l);
  }

  /*====================== 1280 Header and nav ============ */

  .header__container {
    margin-top: 17px;
  }

  .header__nav-el {
    font-size: var(--text-m);
  }

  .header__action {
    margin-right: -12px;
  }
  /* ===================== 1280 Hero ====================== */

  .hero__container {
    max-width: 1180px;
  }

  .hero__button {
    margin-top: 64px;
    margin-left: 42px;
  }
  /* ===================== 1280 Feature-1 ================= */
  /* ===================== 1280 Feature-2 ================= */

  .feature-2 {
    margin-top: 142px;
  }

  .feature-2__container {
    gap: 188px;
  }

  /* ===================== 1280 Feature-3 ================= */

  .feature-3__container {
    margin-top: 227px;
    gap: 170px;
  }

  /* ===================== 1280 Feature-4 ================= */

  .feature-4__container {
    gap: 168px;
  }

  /* ===================== 1280 Action ==================== */

  .action__left {
    font-size: var(--text-xl);
  }

  .action__right {
    font-size: var(--text-xl);
  }

  /* ===================== 1280 Footer ==================== */

  .footer__top {
    padding-right: 42px;
    display: flex;
    justify-content: space-between;
  }

  .footer__logo-block {
    display: block;
  }

  .footer__logo-block-right {
    margin-top: 28px;
  }

  .footer__logo-link {
    margin-left: 0;
    margin-right: 28px;
  }

  .footer__nav {
    grid-template-columns: repeat(4, minmax(110px, 1fr));
    gap: 80px;
  }

  .footer__nav-col {
    margin-top: 0;
  }
}

@media screen and (min-width: 1536px) {
  /*====================== 1536 Header and nav ============ */
  /* ===================== 1536 Hero ====================== */
  /* ===================== 1536 Feature-1 ================= */
  /* ===================== 1536 Feature-2 ================= */
  /* ===================== 1536 Feature-3 ================= */
  /* ===================== 1536 Feature-4 ================= */
  /* ===================== 1536 Action ==================== */
  /* ===================== 1536 Footer ==================== */
}