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

:root {
  --hover-color: color-mix(in oklch, var(--bg-color) 85%, var(--color-contrast) 15%);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--text-color);
  background: var(--bg-color);
  line-height: var(--line-height-normal);
}

header {
  z-index: 999;
  background-color: var(--bg-color);

  border-bottom: 1px solid var(--color-grey);
}

.scroll-header {
  position: fixed;
  top: 0;
  width: 100%;
  transform: translateY(-100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.scroll-header.visible {
  transform: translateY(0);
}

.container {
  max-width: 1200px;
  margin: auto;
  padding: var(--space-md);
  overflow: visible;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) 0;
}

.intro {
  position: absolute;
  width: 100vw;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.logo {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-bold);
}

.logo .bold {
  color: var(--text-color-secondary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  list-style: none;
}

.nav-links a,
.nav-links button {
  display: block;
  text-decoration: none;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-sm);
  border: none;
  border-radius: var(--space-md);
  color: var(--text-color);
  cursor: pointer;
  background: none;
  transition: background-color 200ms ease-out;

  &:hover {
    background-color: var(--hover-color);
  }
}

.menu-toggle {
  display: none;
  cursor: pointer;
}

.btn {
  background: var(--text-color-secondary);
  color: var(--bg-color);
  border-radius: var(--border-radius-sm);
}

.btn-secondary {
  border: 1px solid var(--border-color-muted);
  border-radius: var(--border-radius-sm);
}

.hero {
  background: var(--bg-color-accent);
  padding: calc(var(--space-3xl) + var(--space-md)) 0;
  text-align: center;
}

.hero h1 {
  font-size: var(--text-5xl);
}

.hero p {
  font-size: var(--text-xl);
  margin-top: var(--space-md);
}

#particles-js {
  height: 90vh;
}

#about,
.use-case {
  background-color: color-mix(in oklch, var(--bg-color) 80%, white 20%);
  border: 1px solid var(--color-grey);

  display: flex;
  gap: var(--space-2xl);
  align-items: center;
  padding: var(--space-2xl) var(--space-md);

  video {
    border-radius: var(--border-radius-md);
  }
}

.image-placeholder,
video {
  height: 200px;
  width: calc(200px * 16 / 9);
  border-radius: var(--border-radius-md);
}

.image-placeholder {
  background: var(--hover-color);
}

#about div,
.use-case div {
  flex: 1;
}

.contact h2 {
  text-align: center;
  margin-bottom: var(--space-md);
}

form {
  max-width: 400px;
  margin: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

form input,
form textarea {
  padding: var(--space-sm);
  border: 1px solid var(--border-color-muted);
  border-radius: var(--border-radius-sm);
  background: var(--bg-color);
  color: var(--text-color);
}

form button {
  background: var(--text-color-secondary);
  color: var(--bg-color);
  border: none;
  padding: calc(var(--space-sm) + var(--space-xs)) var(--space-md);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: opacity 200ms ease-out;

  &:hover {
    opacity: 0.9;
  }
}

.more-info {
  margin-top: var(--space-md);
  padding: calc(var(--space-xs) + 2px) var(--space-md);
  background: transparent;
  color: var(--text-color-secondary);
  border: solid 1px var(--text-color-secondary);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: all 200ms ease-out;

  &:hover {
    background: var(--text-color-secondary);
    color: var(--bg-color);
  }
}

.tag {
  display: inline-block;
  font-size: var(--text-xs);
  background: var(--hover-color);
  color: var(--text-color-muted);
  padding: calc(var(--space-xs) / 2) var(--space-sm);
  border-radius: 10px;
  margin-left: var(--space-sm);
}

footer {
  background: var(--bg-color-accent);
  padding: var(--space-2xl) var(--space-md);
  font-size: var(--text-sm);
}

.footer .container {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2xl);
  justify-content: space-between;
}

.footer .contact {
  display: flex;
  flex-flow: column nowrap;
  font-size: var(--text-base);
  font-weight: var(--font-light);

  span {
    display: flex;
    align-items: center;
  }

  a {
    margin: var(--space-sm);
  }
}

footer ul {
  list-style: none;
  padding: 0;
}

footer li {
  margin-bottom: var(--space-sm);
}

footer a {
  text-decoration: none;
  color: var(--text-color-muted);
  transition: color 200ms ease-out;

  &:hover {
    color: var(--text-color);
  }
}

footer {
  .vertical-contact {
    display: flex;
    flex-flow: column;
    flex-grow: 1;
  }

  .horizontal-container {
    display: flex;
    flex-flow: row;
    flex-grow: 2;
    gap: var(--space-2xl);
    justify-content: space-between;
  }
}

.socials {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-md);
  justify-content: flex-start;
  align-items: center;
}

.socials img {
  width: 32px;
  height: 32px;
  filter: grayscale(100%);
  transition:
    filter 200ms ease-in-out,
    transform 200ms ease-in-out;
}

.socials img:hover {
  filter: grayscale(0%);
  transform: scale(1.05);
}

#carousel .categories {
  text-align: center;
  margin-bottom: var(--space-md);
}

#carousel .categories button {
  margin: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--border-color-muted);
  color: var(--text-color);
  border-radius: 20px;
  background: none;
  cursor: pointer;
  transition: background-color 200ms ease-out;

  &:hover {
    background-color: var(--hover-color);
  }
}

#carousel .categories .active {
  background: var(--hover-color);
  color: var(--text-color-secondary);

  &:hover {
    opacity: 0.8;
  }
}

.carousel-content .carousel-item {
  display: none;
  animation: fadeIn 0.4s ease-in-out;
}

.carousel-content .active {
  display: block;
}

.carousel-item {
  margin: var(--space-md);
  transition: opacity 600ms ease;
}

.carousel-item .active {
  opacity: 1;
}

.carousel-item .item-content {
  display: flex;
  align-items: center;
  gap: var(--space-2xl);
  margin-top: var(--space-md);

  & > * {
    max-width: 50vw;
  }

  h3 {
    display: flex;
    flex-flow: row;
    align-items: center;
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background-color: var(--bg-color);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-md);
    display: none;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    z-index: 10;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links li {
    width: 100%;
    margin: var(--space-sm) 0;

    a {
      display: block;
      width: 100%;
      text-align: left;
    }
  }

  #about,
  .use-case {
    flex-direction: column;
    padding: var(--space-md);

    .image-placeholder {
      flex: none;
    }
  }

  .carousel-item .item-content {
    flex-direction: column;
    & > * {
      max-width: 100%;
    }
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}