:root {
  /* Color variables */
  --color-bg: #ffffff;
  --color-bg-productivision-header: #000000;
  --color-bg-productvision: #a9d6e8;
  --color-text: #000000;
  --color-text-alt: #ffffff;
  --color-primary: #ffe789;
  --color-secondary: #97a7b9;

  /* Styling variables */
  --margin-body: 1rem;
  --flex-gap: 0.5rem;
  --border-radius: 1.5625rem;

  font-size: 14pt;
  color: var(--color-text);
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
}

a {
  color: var(--color-text);
  text-decoration: none;
}

a:visited {
  color: var(--color-text);
}

li {
  font-family: Gudea, sans-serif;
  font-weight: 400;
  line-height: normal;
}

li::marker {
  font-size: 1.2rem;
  text-align: center;
}

h2 {
  font-family: Kanit, sans-serif;
  font-size: 2.25rem;
  font-weight: 700;
  line-height: normal;
  margin-block: 1rem;
}

h3 {
  font-family: Kanit, sans-serif;
  font-size: 1.95rem;
  font-weight: 700;
  line-height: normal;
  margin-block: 0;
  text-align: center;
}

h4 {
  font-family: Gudea, sans-serif;
  font-size: 1.3125rem;
  line-height: normal;
}

h5 {
  font-family: Gudea, sans-serif;
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: normal;
  margin-block: 0.9rem 0;
  padding-inline: 1rem;
}

p {
  font-family: Gudea, sans-serif;
  font-weight: 400;
  line-height: normal;
}

header {
  position: sticky;
  top: 0;
  width: 100%;
  background-color: var(--color-bg);
  margin: 0;
  overflow-x: hidden;
  z-index: 9999;
}

menu {
  width: auto;
  margin: 0;
  padding: 1.6875rem 0;
  margin-inline: var(--margin-body);
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
}

menu li {
  color: var(--color-text);
  font-family: Kanit, sans-serif;
  font-size: 1rem;
  font-weight: 400;
  line-height: normal;
  list-style-type: none;
  max-width: max-content;
  height: 100%;
}

menu a {
  height: max-content;
  vertical-align: middle;
}

.menu-items {
  display: flex;
  flex-direction: row;
  justify-content: start;
  align-items: center;
  gap: 3rem;
}

.menu-teamname {
  color: var(--color-text);
  font-family: Kanit, sans-serif;
  font-size: 2.625rem;
  font-weight: 700;
  line-height: normal;
}

.pad-container {
  margin-inline: var(--margin-body);
}

section {
  margin-bottom: 1rem;
}

section.hero {
  background-image: url("../assets/hero-skyline.png");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
  width: 100%;
  height: 33.75rem;
  text-align: center;
  margin: 0;
}

section.sprint h2 {
  text-align: center;
}

.sprint p {
  margin: 1rem;
  margin-inline: 2rem;
}

.sprint li p {
  margin-inline: unset;
}

.concepts.carrousel {
  position: relative;
  max-width: 100%;
  margin: 0 auto;
}

.carrousel-container {
  overflow-x: auto;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

/* Hide scrollbar for Chrome/Safari/Edge */
.carrousel-container::-webkit-scrollbar {
  display: none;
}

.carrousel-container ul {
  display: flex;
  list-style: none;
  padding: 0;
  gap: 4vw;
  overflow-x: scroll;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  height: 70vh;
  align-items: end;
}

.carrousel-item {
  position: relative;
  display: flex;
  flex-direction: column;
  background-color: #eeeeee;
  border: 1px solid #dddddd;
  scroll-snap-align: center;

  width: 50vw;
  min-width: 50vw;
  height: 60%;
  transition: height 0.3s ease;

  border-radius: var(--border-radius);
  margin: 1rem;
  overflow-x: hidden;
}

.carrousel-item.active {
  height: 95%;
}

.carrousel-item img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.carrousel-item img {
  height: 100%;
  width: 100%;

  transition: height 0.3s ease;
}
.carrousel-item.active img {
  width: 100%;
  height: 60%;
}

.carrousel-item.active h3.alt-title {
  display: none;
  opacity: 0;
  transform: translateY(6px);
}

.carrousel-item h3.alt-title {
  visibility: visible;
  opacity: 1;
  color: white;
  height: 3rem;
  width: 100%;
  background: #00000070;
  position: absolute;
  bottom: 0;
  /* make it visible on non-active by default; hidden when active below */
  transition:
    opacity 0.3s ease,
    transform 0.3s ease;
}

.carrousel-item div {
  visibility: hidden;
  display: none;
}

.carrousel-item.active .alt-title {
  display: none;
}
.carrousel-item .description,
.carrousel-item.active .description {
  padding: 1rem;
  background: rgba(0, 0, 0, 0.03); /* optional subtle background */
  flex: 1 1 auto; /* allow description to fill remaining space */
  overflow: auto;
}

.carrousel-item.active div {
  background: #00000030;
  visibility: visible;
  display: block;
  height: 100%;
}

.carrousel-prev,
.carrousel-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  font-size: 2rem;
  color: black;
  opacity: 0.7;
  cursor: pointer;
  z-index: 2;
}

.carrousel-prev:hover,
.carrousel-next:hover,
.carrousel-prev:focus,
.carrousel-next:focus {
  opacity: 1;
}

.carrousel-prev:active,
.carrousel-next:active {
  transform: translateY(-50%) translate(1px, 1px);
}

.carrousel-prev {
  left: 10px;
}

.carrousel-next {
  right: 10px;
}

.carrousel-indicators {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 20px;
}

.indicator {
  width: 16px;
  height: 16px;
  border: 2px solid black;
  border-radius: 50%;
  background-color: transparent;
  cursor: pointer;
  padding: 0;
}

.indicator.active {
  background-color: black;
}

.indicator:focus {
  outline: 2px solid #000;
  outline-offset: 2px;
}

.concept-pitch {
  background: var(--color-bg-productvision);
  margin-block: 2rem;
  padding-block: 2rem;
}

.concept-pitch h3 {
  text-align: start;
  padding-left: var(--margin-body);
}

.concept-pitch ul {
  padding-left: 4rem;
}

.concept-pitch .grid-container {
  display: grid;
  grid-template-columns: 1fr 4fr 1fr;
}

.concept-pitch .grid-container .grid-text {
  grid-column: 2;
}

.concept-pitch .grid-container .grid-icon {
  width: 128px;
  height: auto;
  margin-block: auto;
}
.concept-pitch .grid-container .grid-icon:nth-of-type(2n + 1) {
  grid-column: 1;
  justify-self: end;
}
.concept-pitch .grid-container .grid-icon:nth-of-type(2n) {
  grid-column: 3;
  justify-self: start;
}
.concept-pitch .grid-container .grid-icon:nth-of-type(1) {
  grid-row: 1;
}
.concept-pitch .grid-container .grid-icon:nth-of-type(2) {
  grid-row: 2;
}
.concept-pitch .grid-container .grid-icon:nth-of-type(3) {
  grid-column: 1;
  grid-row: 3;
}

section.sprint .insights h2 {
  text-align: start;
}

.insights h3 {
  text-align: start;
}

.productvision-container {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  margin-block-start: 2rem;
}

.productvision-container h3 {
  color: var(--color-text-alt);
  font-size: 1.3125rem;
}

.productvision-flex-item {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

.productvision-flex-item h4 {
  margin: 0;
}

.productvision-background {
  background-color: var(--color-bg-productvision);
  border: 1rem solid white;
  min-width: 80vw;
}

.productvision-logo-container {
  width: 100%;
  height: 9.6875rem;
  display: flex;
  justify-content: center;
  align-items: center;
}

.productvision-header {
  width: fit-content;
  height: max-content;
  padding: 2.6rem 2.3rem;
  border-radius: var(--border-radius) var(--border-radius) 0 0;
  background-color: var(--color-bg-productivision-header);
}

.productvision-chapter {
  background-color: var(--color-bg);
  border-radius: var(--border-radius);
  margin: 4rem;
  padding-block: 1rem;
}

.productvision-chapter:nth-of-type(1) {
  margin-block-start: 3rem;
}

.productvision-chapter h4 {
  padding-inline: 3rem;
}

.productvision-chapter h5 {
  padding-inline: 3rem;
}

.productvision-chapter p {
  padding-inline: 1rem;
}

.planning .backlog {
  margin-block-end: 9rem;
}

.planning .backlog h3 {
  margin-block: 3rem;
}

.planning .backlog ul {
  margin-inline: 7rem;
}

.planning .grid-container {
  display: grid;
  grid-template-columns: 100%;
  align-items: stretch;
}

.planning .grid-container .grid-item-background {
  height: max-content;
}

.planning .grid-container .grid-item {
  margin: 2rem;
  border-radius: var(--border-radius);
  padding-block-end: 6rem;
  text-align: center;
}

.planning .grid-container .grid-item p {
  font-family: Kanit;
  font-size: 1.5rem;
  font-weight: 700;
}

.backlog ul {
  margin-inline: 7rem;
}

section.about-us {
  display: flex;
  flex-direction: column-reverse;
  justify-content: space-around;
  align-items: center;
  padding: 6.6rem 4rem;
  gap: 6.5rem;
  background-color: var(--color-primary);
}

section.about-us .flex-container {
  display: flex;
  gap: 6.5rem;
}

section.about-us .flex-container p {
  margin: 0;
}

section.about-us .flex-container ul.people {
  list-style-type: none;
  padding-inline: 0;
}

section.about-us .flex-container ul.people li {
  display: flex;
}

section.about-us .flex-container .study {
  margin-inline-start: 0.625rem;
  font-weight: 700;
}

footer .footnote {
  margin-inline: var(--margin-body);
  display: flex;
  flex-direction: row-reverse;
  justify-content: space-between;
}

.image-divider#drone-erasmus {
  background-image: url("../assets/drone-erasmus.png");
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  height: 53rem;
}

.image-divider#drone-erasmus .image-credits {
  color: white;
  font-family: Kanit;
  font-size: 0.5625rem;
  font-weight: 700;
  line-height: normal;
  margin: 1rem;
  text-align: end;
}

.divider {
  height: 4rem;
  width: auto;
  background-color: var(--color-primary);
}

.anchor {
  scroll-snap-align: start;
  scroll-margin: 12.5rem;
}

.invisible {
  margin: 0;
  padding: 0;
  width: 0;
  height: 0;
}

.menu-back-to-top {
  visibility: hidden;
}

@media screen and (max-width: 1279px) {
  .planning .grid-container .grid-item-background:nth-of-type(2n) {
    background-color: white;
  }

  .planning .grid-container .grid-item-background:nth-of-type(2n) .grid-item {
    background-color: var(--color-primary);
  }

  .planning .grid-container .grid-item-background:nth-of-type(2n + 1) {
    background-color: var(--color-primary);
  }

  .planning
    .grid-container
    .grid-item-background:nth-of-type(2n + 1)
    .grid-item {
    background-color: white;
  }

  .planning .grid-container .grid-item-background.filler {
    display: none;
  }
}

@media screen and (min-width: 768px) {
  :root {
    --margin-body: 2rem;
  }
}

@media screen and (min-width: 1280px) {
  :root {
    --margin-body: 4rem;
    --flex-gap: 2rem;
  }

  .productvision-container {
    flex-direction: row;
  }

  .productvision-background {
    min-width: 40vw;
  }

  .planning .grid-container {
    grid-template-columns: 50% 50%;
  }

  .planning .grid-container .grid-item {
    min-height: 15rem;
    padding-block-end: unset;
  }

  .planning .grid-container .grid-item-background:not(.alt) {
    background-color: white;
  }

  .planning .grid-container .grid-item-background:not(.alt) .grid-item {
    background-color: var(--color-primary);
  }

  .planning .grid-container .grid-item-background.alt {
    background-color: var(--color-primary);
  }

  .planning .grid-container .grid-item-background.alt .grid-item {
    background-color: white;
  }

  section.about-us {
    flex-direction: row;
  }

  .menu-back-to-top {
    visibility: visible;
  }
}

@media print {
  .menu-back-to-top {
    visibility: hidden;
  }
}