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

body{
     background-color: #ffffff;
     font-family: "Nunito Sans", Calibri, sans-serif;

     animation: fadeInAnimation ease 3s;
     animation-iteration-count: 1;
     animation-fill-mode: forwards;

}

.centering {
    margin: 0 auto;
}

@keyframes fadeInAnimation {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}

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

/* subtitle */
.subtitle {
    font-size: 20px; 
    color: hsl(168, 38%, 15%); 
    width: 600px;
}

/* navbar */

.site-header {
  background-color: #ffffff;
  box-shadow: 0 2px 5px rgba(31, 34, 36, 0.25);
  padding: 10px 15px;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
}

.nav-group {
  display: flex;
  gap: 30px;
  flex: 1
}

.nav-group:last-child {
  justify-content: flex-end;
}

.nav-link {
  text-decoration: none;
  color: #272726;
  font-weight: 500;
  font-size: 16px;
}

.nav-link:hover {
  color: #397500;
}

/* logo */
.logo-container {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0 20px;
}

.logo-img {
  height: 50px;
  width: auto;
  display: block;
}

/* skills bin */
.skills-container {
    display: grid;
    grid-template-columns: 1fr;

    max-width: 1200px;
    padding: 20px;
}

/* design bin */
.design-container {
    display: grid;
    grid-template-columns: 1fr;

    max-width: 1200px;
    padding: 20px;
}


/* about bin */
.about-container {
    display: grid;
    grid-template-columns: 1fr 1fr;

    max-width: 1200px;
    padding: 20px;
}

/* research interests bin */
.research-interests-container {
    display: grid;
    grid-template-columns: 1fr;

    max-width: 1200px;
    padding: 20px;
}

.research-interesttd {
    font-size: 2rem;
}

/* design */

.grid {
  column-count: 3;
  column-gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.grid-item {
  break-inside: avoid;
  margin-bottom: 20px;
}

.grid-item img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 8px;
}

/* Responsive */
@media (max-width: 768px) {
  .grid {
    column-count: 2;
  }
}

@media (max-width: 480px) {
  .grid {
    column-count: 1;
  }
}

/* cv bin */
.cv-container {
    display: grid;
    grid-template-columns: 1fr;

    max-width: 1200px;
    padding: 20px;
}

details {
  border-radius: 8px;
  padding: 12px 16px;
}

summary {
  font-weight: 600;
  font-size: 16px;
  color: #272726;

  padding: 20px;
  border-radius: 20px;
  background: rgb(185, 185, 185);
  cursor: pointer;

  transition: ease-in 0.1s;
}

summary:hover {
  color: #397500;
}

details p {
  font-size: 0.9rem;
  padding: 5px;
  
  border-top: 1px solid #dee2e6;
  color: #979797;
  line-height: 1.3;
}

/* experiment zone */
.experiment-container {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr 1fr;

    max-width: 1200px;
    padding: 20px;
}

.experiment {
    padding: 20px;
}

/* mobile */
@media (max-width: 768px) {
  .nav-container {
    flex-direction: column;
    gap: 15px;
  }
  
  .nav-group {
    justify-content: center !important;
  }
}

@media only screen and (max-width: 600px) {
    .row {
     grid-template-columns: 1fr;
    }
    .row-item {
    }
    .title {
     font-size: 40px;
    }
}