:root {
  --main-text-color: #757575;
  --title-text-color: #212121;
  --accent-color: #2196f3;
  --main-white-color: #ffffff;
  --main-black-color: #000000;
  --add-footer-color: rgba(255, 255, 255, 0.6);
  --main-bg-color: #ffffff;
  --sec-bg-color: #2f303a;
  --add-bg-color: #f5f4fa;
  --border-portfolio-color: #ececec;
  --background-overlay-transparent-color: rgba(47, 48, 58, 0.4);
  --hero-background-color: #c4c4c4;
  --icon-color: #afb1b8;
  --social-link-bg-color: rgba(255, 255, 255, 0.1);
  --overlay-text-color: rgba(47, 48, 58, 0.8);
  --overlay-background-color: rgba(33, 150, 243, 0.9);
  --overlay-backdrop-color: rgba(0, 0, 0, 0.2);
  --border-modal-btn: rgba(0, 0, 0, 0.1);

  --timing-fn: cubic-bezier(0.4, 0, 0.2, 1);
}
body {
  background-color: var(--main-bg-color);
  color: var(--main-text-color);
  font-family: Roboto, sans-serif;
  font-size: 14px;
  line-height: 1.71;
  letter-spacing: 0.03em;
}
.container {
  margin: 0 auto;
  width: 1200px;
  padding: 0 15px;
  /* outline: 2px solid tomato; used for checking */
}
ul {
  font-style: normal;
  list-style: none;
  padding: 0;
  margin: 0;
}
a {
  text-decoration: none;
}
img {
  display: block;
  max-width: 100%;
  height: auto;
}

/* Page-header */
.page-header .container,
.main-nav,
.main-contacts {
  display: flex;
  align-items: center;
}
/* Logo */
.logo {
  display: inline-block;
  color: var(--accent-color);
  font-family: Raleway, sans-serif;
  font-weight: 700;
  font-size: 26px;
  line-height: 1.19;
}
.studio {
  color: var(--main-black-color);
}
/* Site-navigation */
.site-nav {
  display: flex;
  margin-left: 93px;
}
.site-nav .list {
  display: block;
  padding-top: 32px;
  padding-bottom: 32px;
  color: var(--title-text-color);
  font-weight: 500;
  line-height: 1.14;
  letter-spacing: 0.02em;
  transition: color 250ms var(--timing-fn);
}
.site-nav .list.current {
  position: relative;
}
.site-nav .list.current::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -1px;
  display: block;
  width: 100%;
  height: 4px;
  background-color: var(--accent-color);
  border-radius: 2px;
}
.site-nav .list:hover,
.site-nav .list:focus {
  color: var(--accent-color);
  cursor: pointer;
}
.site-nav .list.current {
  color: var(--accent-color);
}
.site-nav .item:not(:last-child) {
  margin-right: 50px;
}
.main-contacts {
  margin-left: auto;
}
.main-contacts .item:not(:last-child) {
  margin-right: 50px;
}
.header-contacts {
  color: var(--main-text-color);
  font-weight: 500;
  line-height: 1.14;
  letter-spacing: 0.02em;
  align-items: center;
  transition: color 250ms var(--timing-fn);
}
.header-contacts:hover,
.header-contacts:focus {
  color: var(--accent-color);
}
.main-contacts .item a {
  display: flex;
  align-items: center;
  padding-top: 32px;
  padding-bottom: 32px;
  border: none;
  width: 100%;
}
.contact-link {
  margin-right: 10px;
  fill: currentColor;
  cursor: pointer;
  transition: fill 250ms var(--timing-fn);
}
.contact-link:hover,
.contact-link:focus {
  color: var(--accent-color);
}

/* Hero section*/
.overlay {
  max-width: 1600px;
  height: 600px;
  margin-left: auto;
  margin-right: auto;
  background-image: linear-gradient(
      to right,
      var(--background-overlay-transparent-color),
      var(--background-overlay-transparent-color)
    ),
    url('../images/overlay.jpg');
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  padding-top: 200px;
  padding-bottom: 200px;
  background-color: var(--hero-background-color);
  text-align: center;
}
.hero-title {
  margin-top: 0;
  margin-bottom: 30px;
  color: var(--main-white-color);
  font-weight: 900;
  font-size: 44px;
  line-height: 1.36;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.visually-hidden {
  position: absolute;
  clip: rect(0 0 0 0);
  width: 1px;
  height: 1px;
  margin: -1px;
}
.hero-button {
  display: inline-block;
  border-radius: 4px;
  padding: 10px 32px;
  min-width: 200px;
  background-color: var(--accent-color);
  color: var(--main-white-color);
  box-shadow: 0px 4px 4px rgba(0, 0, 0, 0.15);
  font-family: inherit;
  font-weight: 700;
  font-size: 16px;
  line-height: 1.87;
  letter-spacing: 0.06em;
  border: transparent;
  outline: transparent;
  cursor: pointer;
}
/* Modal window */
.backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--overlay-backdrop-color);
  opacity: 1;
  transition: opacity 250ms var(--timing-fn);
  /* z-index: 1; */
}
.backdrop.is-hidden {
  /* visibility: hidden; */
  opacity: 0;
  pointer-events: none;
}
.backdrop.is-hidden .modal {
  transform: translate(-50%, -150%);
}
.modal {
  position: absolute;
  top: 50%;
  left: 50%;
  min-width: 528px;
  min-height: 581px;
  background-color: var(--main-bg-color);
  box-shadow: 0px 1px 3px rgba(0, 0, 0, 0.12), 0px 1px 1px rgba(0, 0, 0, 0.14),
    0px 2px 1px rgba(0, 0, 0, 0.2);
  border-radius: 4px;

  transform: translate(-50%, -50%) scale(1);
  transition: transform 250ms var(--timing-fn);
}
.modal-close-btn {
  position: absolute;
  right: 8px;
  top: 8px;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0;
  height: 30px;
  width: 30px;
  color: var(--main-black-color);
  border: 1px solid var(--border-modal-btn);
  border-radius: 50%;
  background-color: var(--main-bg-color);
  outline: transparent;
  transition: color 250ms var(--timing-fn);
}
.close-icon {
  fill: currentColor;
}
.modal-close-btn:hover,
.modal-close-btn:focus {
  color: var(--accent-color);
  cursor: pointer;
}

/* Section */
.section {
  padding-top: 94px;
  padding-bottom: 94px;
}
.no-padding {
  padding-top: 0;
}
.section-title {
  margin-top: 0;
  margin-bottom: 50px;
  color: var(--title-text-color);
  font-weight: 700;
  font-size: 36px;
  line-height: 1.17;
  text-align: center;
}
.centered {
  text-align: center;
}

/* Advantages */
.feature-list {
  display: flex;
}
.feature-list .item {
  width: calc((100% - 3 * 30px) / 3);
}
.feature-list .item:not(:last-child) {
  margin-right: 30px;
}
.feature-icon {
  display: block;
  width: 100%;
  height: 120px;
  padding: 25px 100px;
  margin-bottom: 30px;
  background-color: var(--add-bg-color);
}
.feature-list .title {
  margin-top: 0;
  margin-bottom: 10px;
  color: var(--title-text-color);
  font-weight: 700;
  font-size: 14px;
  line-height: 1.14;
  text-transform: uppercase;
}
.feature-list p,
.team-list p {
  margin-top: 0;
  margin-bottom: 0;
}

/* Our works */
.activities-list {
  display: flex;
}
.activities-list .item:not(:last-child) {
  margin-right: 30px;
}
.activity-thumb {
  position: relative;
}
.activity-overlay {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding-top: 27px;
  padding-bottom: 27px;
  background-color: var(--overlay-text-color);
}
.activity-title {
  margin-top: 0;
  margin-bottom: 0;
  color: var(--main-bg-color);
  font-weight: 700;
  line-height: 1.14;
  text-align: center;
  text-transform: uppercase;
}

/* Our team */
.team {
  background-color: var(--add-bg-color);
  text-align: center;
}
.team-list .photo {
  margin-bottom: 30px;
}
.team-list {
  display: flex;
}
.team-list > .item {
  width: 270px;
  padding-top: 0;
  padding-bottom: 30px;
  background: #ffffff;
  box-shadow: 0px 1px 3px rgba(0, 0, 0, 0.12), 0px 1px 1px rgba(0, 0, 0, 0.14),
    0px 2px 1px rgba(0, 0, 0, 0.2);
  border-radius: 0px 0px 4px 4px;
}
.team-list .item:not(:last-child) {
  margin-right: 30px;
}
.team-list .name {
  margin-top: 0;
  margin-bottom: 10px;
  color: var(--title-text-color);
  font-weight: 500;
  font-size: 16px;
  line-height: 1.19;
}
.team-list .position {
  margin-bottom: 16px;
  font-size: 16px;
  line-height: 1.19;
}
.team-list .social-links {
  display: flex;
  justify-content: space-between;
  padding-left: 32px;
  padding-right: 32px;
}
.team-list .social-links .item {
  width: 44px;
  height: 44px;
}
.team-list .social-links .item:not(:last-child) {
  margin-right: 10px;
}
.team-list .social-link {
  background-color: var(--main-bg-color);
  color: var(--icon-color);
  transition: background-color 250ms var(--timing-fn),
    color 250ms var(--timing-fn);
}
.team-list .social-icon {
  width: 20px;
  height: 20px;
  fill: currentColor;
}
.team-list .social-link:hover,
.team-list .social-link:focus {
  background-color: var(--accent-color);
  color: var(--main-white-color);
}

/* Clients */
.client-list {
  display: flex;
}
.client-link {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 170px;
  height: 90px;
  border: 1px solid var(--icon-color);
  border-radius: 4px;
  color: var(--icon-color);
  transition: color 250ms var(--timing-fn), border-color 250ms var(--timing-fn);
}
.client-list .item:not(:last-child) {
  margin-right: 30px;
}
.client-link:hover,
.client-link:focus {
  border-color: var(--accent-color);
  color: var(--accent-color);
  filter: drop-shadow(0px 4px 4px rgba(0, 0, 0, 0.25));
  cursor: pointer;
}
.client-logo {
  fill: currentColor;
}

/* Footer */
.footer .container {
  display: flex;
  align-items: baseline;
}
.footer {
  padding: 60px 0;
  background-color: var(--sec-bg-color);
}
/* Logo */
.footer-studio {
  margin-top: 0;
  margin-bottom: 20px;
  color: var(--main-white-color);
}
.footer .address {
  margin-right: 70px;
  margin-top: 0;
  margin-bottom: 9px;
  color: var(--main-white-color);
  font-style: normal;
}
.footer-contacts {
  margin-top: 0;
  margin-bottom: 9px;
}
.footer-contacts-list .footer-contacts:last-child {
  margin-bottom: 0;
}
.footer-contacts-list a {
  display: block;
  color: var(--add-footer-color);
  font-style: normal;
}
.social-container {
  width: 206px;
}
.social-container p {
  margin-top: 0;
  margin-bottom: 20px;
  font-weight: 700;
  line-height: 1.14;
  text-transform: uppercase;
  color: var(--main-white-color);
}
.social-links {
  display: flex;
  justify-content: space-between;
}
.social-links .item:not(:last-child) {
  margin-right: 10px;
}
.social-link {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  color: var(--main-white-color);
  background-color: var(--social-link-bg-color);
  transition: background-color 250ms var(--timing-fn);
}
.social-link:hover,
.social-link:focus {
  background-color: var(--accent-color);
}
.social-icon {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

/* Portfolio */
.line {
  border-bottom: 1px solid var(--border-portfolio-color);
}
/* Filter */
.filter-list {
  display: flex;
  justify-content: center;
}
.filter-item {
  display: inline-block;
  padding: 6px 22px;
  margin-bottom: 50px;
  margin-right: 8px;
  border-radius: 4px;
  background-color: var(--add-bg-color);
  color: var(--title-text-color);
  font-family: inherit;
  font-weight: 500;
  font-size: 16px;
  line-height: 1.62;
  text-align: center;
  letter-spacing: 0.03em;
  cursor: pointer;
  border: transparent;
  outline: transparent;
  transition: background-color 250ms var(--timing-fn),
    color 250ms var(--timing-fn);
}
.filter-item:hover,
.filter-item:focus {
  background-color: var(--accent-color);
  color: var(--main-white-color);
  box-shadow: 0px 3px 1px rgba(0, 0, 0, 0.1), 0px 1px 2px rgba(0, 0, 0, 0.08),
    0px 2px 2px rgba(0, 0, 0, 0.12);
}
/* Projects */
.work-list .item {
  width: calc((100% - 60px) / 3);
  margin-right: 30px;
  margin-bottom: 30px;
}
.work-list .item a {
  display: block;
  transition: box-shadow 250ms var(--timing-fn);
}
.work-list .item a:hover,
.work-list .item a:focus {
  box-shadow: 0px 1px 1px rgba(0, 0, 0, 0.12), 0px 4px 4px rgba(0, 0, 0, 0.06),
    1px 4px 6px rgba(0, 0, 0, 0.16);
}
.work-list-thumb {
  position: relative;
  overflow: hidden;
}
.work-list-overlay {
  position: absolute;
  display: block;
  width: 100%;
  height: 100%;
  top: 100%;
  margin: 0;
  background-color: var(--overlay-background-color);
  transition: transform 250ms var(--timing-fn);
}
.work-link:focus .work-list-overlay,
.work-link:hover .work-list-overlay {
  transform: translateY(-100%);
}
.work-list-details {
  margin: 0;
  padding: 63px 24px;
  font-size: 18px;
  line-height: 1.56;
  color: var(--main-bg-color);
}
.work-list .content {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-portfolio-color);
  border-right: 1px solid var(--border-portfolio-color);
  border-left: 1px solid var(--border-portfolio-color);
  background: var(--main-bg-color);
  box-sizing: border-box;
}
.work-list .section-title {
  margin-top: 0;
  margin-bottom: 4px;
  font-weight: 700;
  font-size: 18px;
  line-height: 2;
  text-align: left;
  letter-spacing: 0.06em;
}
.work-list {
  display: flex;
  flex-wrap: wrap;
}
.work-list .item:nth-child(3n) {
  margin-right: 0;
}
.work-list .item:nth-last-child(-n + 3) {
  margin-bottom: 0;
}
.section-description {
  margin-top: 0;
  margin-bottom: 0;
  color: var(--main-text-color);
  font-size: 16px;
  line-height: 1.87;
}