@import url("https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900&family=Libre+Baskerville:ital,wght@0,400..700;1,400..700&display=swap");

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

a {
  text-decoration: none;
  line-height: 20px;
  color: var(--muted-foreground);

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

ul {
  list-style-type: none;
}

html {
  container-type: scroll-state;
  container-name: scroller;
  scroll-behavior: smooth;
}

:root {
  --background: #f6f1e9;
  --foreground: #1a1a2e;
  --ring: #b87333;
  --accent: #b87333;
  --muted: #e5dfcf;
  --muted-foreground: #6b6252;
  --border: rgba(26, 26, 46, 0.1);

  --header-height: 56px;
  --font-size: 16px;
  --md-breakpoint: 768px;
  --container-md: 28rem;

  font-family: Inter, sans-serif;

  --ease-out: cubic-bezier(0, 0, 0.2, 1);

  line-height: 1.5;
  --text-sm--line-height: calc(1.25 / 0.875);

  --spacing: 0.25rem;
  --container-4xl: 56rem;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;

  --tw-border-style: solid;
  --radius: 0.625rem;
}

[data-theme="dark"] {
  --background: #12141f;
  --foreground: #e4dfcf;
  --ring: #c88a3e;
  --accent: #c88a3e;
  --muted: #252840;
  --muted-foreground: #8a8ca8;
  --border: rgba(228, 223, 207, 0.1);
}

body {
  font-optical-sizing: auto;
  font-style: normal;
  min-height: 100vh;
  background-color: var(--background);
  color: var(--muted-foreground);
}

/* ------------------ HEADER  ------------------ */
header {
  font-weight: 500;
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 50;
  backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition-property: border;
  transition-duration: 500ms;
  transition-timing-function: var(--ease-out);
}

nav {
  height: var(--header-height);
  max-width: 56rem;
  padding-inline: 24px;
  margin-inline: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;

  button {
    background-color: transparent;
    border: none;
    font-style: inherit;
    font-weight: 500;
    color: var(--muted-foreground);
  }

  ul {
    display: flex;
    gap: 28px;

    li {
      a {
        position: relative;

        &::after {
          position: absolute;
          bottom: -2px;
          left: 0px;
          content: "";
          width: 0;
          border-bottom: 1px solid var(--ring);
          transition-property: width;
          transition-timing-function: var(--ease-out);
          transition-duration: 0.3s;
        }

        @media (width <= 768px) {
          display: none;
        }
      }
      a:hover {
        &::after {
          width: 100%;
        }
      }
    }
  }
}

.menu_icons {
  display: flex;
  align-items: center;
  gap: 12px;
}

#mobile_menu {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: rgba(246, 241, 233, 0.97);
  backdrop-filter: blur(16px);
  opacity: 1;
  transform: none;
  border-bottom: 1px solid var(--border);

  .mobile_menu_layout {
    max-width: var(--container-4xl);
    padding-block: calc(var(--spacing) * 5);
    padding-inline: calc(var(--spacing) * 6);
    margin-inline: auto;

    ul {
      display: flex;
      flex-direction: column;
      gap: calc(var(--spacing) * 4);

      li {
        padding-block: calc(var(--spacing) * 1);

        &:hover {
          a {
            color: var(--foreground);
          }
        }
      }
    }
  }
}

@media (width > 768px) {
  #menu_icon,
  #mobile_menu {
    display: none;
  }
}

/* ------------------ MAIN  ------------------ */
main {
  section:first-child {
    padding-top: var(--header-height);
  }
}

section {
  scroll-margin-top: var(--header-height);
}

svg {
  transition-property: fill, opacity, transform, translate;
  transition-timing-function: var(--ease-out);
  transition-duration: 200ms;
  width: 18px;
  height: 18px;
  fill: currentColor;

  &:hover {
    fill: var(--foreground);
  }
}

/* ------------------ HERO  ------------------ */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: calc(var(--spacing) * 14);

  .layout {
    max-width: var(--container-4xl);
    margin-inline: auto;
    padding-block: calc(var(--spacing) * 24);
    padding-inline: calc(var(--spacing) * 6);
    width: 100%;
    display: grid;
    grid-template-columns: 1fr;
    gap: calc(var(--spacing) * 20);

    @media (width >= 48rem) {
      grid-template-columns: 1fr 200px;
    }
  }

  img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  h1 {
    font-family: "Libre Baskerville", Georgia, serif;
    font-size: clamp(2.2rem, 5vw, 3.6rem);
    font-weight: 400;
    line-height: 1.12;
    letter-spacing: -0.01em;
    color: var(--foreground);
    opacity: 1;
    transform: none;
    margin-bottom: calc(var(--spacing) * 6);
  }

  hr {
    width: calc(var(--spacing) * 10);
    border: 0;
    border-top: 1px solid var(--accent);
    margin-bottom: calc(var(--spacing) * 8);
  }
}

.first_paragraph {
  font-family: Inter, sans-serif;
  opacity: 1;
  transform: none;
  text-transform: uppercase;
  color: var(--accent);
  --tw-tracking: 0.2em;
  letter-spacing: 0.2em;
  font-size: var(--text-xs);
  line-height: var(--tw-leading, var(--text-xs--line-height));
  margin-bottom: calc(var(--spacing) * 6);
}

.second_paragraph {
  font-family: Inter, sans-serif;
  font-size: 0.95rem;
  font-weight: 400;
  margin-bottom: calc(var(--spacing) * 1);
}

.third_paragraph {
  font-family: Inter, sans-serif;
  font-size: 0.9rem;
  color: var(--muted-foreground);
  margin-bottom: calc(var(--spacing) * 8);
}

.fourth_paragraph {
  font-family: Inter, sans-serif;
  font-size: 0.93rem;
  line-height: 1.8;
  opacity: 1;
  transform: none;
  max-width: var(--container-lg);
  margin-bottom: calc(var(--spacing) * 3);
}

.fifth_paragraph {
  font-family: Inter, sans-serif;
  font-size: 0.93rem;
  line-height: 1.8;
  opacity: 1;
  transform: none;
  max-width: var(--container-lg);
  margin-bottom: calc(var(--spacing) * 10);
}

.hero_icons {
  display: flex;
  gap: calc(var(--spacing) * 5);
  flex-wrap: wrap;

  a {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing) * 1.5);
    font-size: var(--text-sm);
    line-height: var(--tw-leading, var(--text-sm--line-height));
    font-family: Inter, sans-serif;

    span {
      position: relative;

      &::after {
        position: absolute;
        bottom: -2px;
        left: 0px;
        content: "";
        width: 0;
        border-bottom: 1px solid var(--ring);
        transition-property: width;
        transition-timing-function: var(--ease-out);
        transition-duration: 0.3s;
      }
    }
  }

  a:hover {
    span::after {
      width: 100%;
    }
  }
}

#hero_image {
  display: none;

  @media (width >= 48rem) {
    display: block;
  }
}

/* ------------------ RESEARCH  ------------------ */
#research {
  border-color: var(--border);
  border-top-style: var(--tw-border-style);
  border-top-width: 1px;
  padding-block: calc(var(--spacing) * 28);

  .spacing {
    padding-inline: calc(var(--spacing) * 6);
    max-width: var(--container-4xl);
    margin-inline: auto;

    h2 {
      font-family: "Libre Baskerville", Georgia, serif;
      font-size: clamp(1.4rem, 2.5vw, 1.9rem);
      font-weight: 400;
      color: var(--foreground);
      letter-spacing: -0.01em;
      margin-bottom: calc(var(--spacing) * 14);
    }

    .grid_layout {
      display: grid;
      grid-template-columns: repeat(1, minmax(0, 1fr));
      row-gap: calc(var(--spacing) * 11);
      column-gap: calc(var(--spacing) * 14);

      @media (width >= 40rem) {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      div {
        div {
          display: flex;
          gap: calc(var(--spacing) * 3);
          align-items: baseline;
          margin-bottom: calc(var(--spacing) * 2);

          span {
            font-size: 1.1rem;
            color: var(--accent);
          }

          h3 {
            font-family: "Libre Baskerville", Georgia, serif;
            font-size: 0.97rem;
            font-weight: 700;
            color: var(--foreground);
            line-height: 1.3;
          }
        }

        p {
          font-family: Inter, sans-serif;
          font-size: 0.875rem;
          line-height: 1.75;
          color: var(--muted-foreground);
          /* left align p with h3 above */
          padding-left: calc(var(--spacing) * 6);
        }
      }
    }
  }
}

/* ------------------ PAPERS  ------------------ */
#papers {
  border-color: var(--border);
  border-top-style: var(--tw-border-style);
  border-top-width: 1px;
  padding-block: calc(var(--spacing) * 28);

  .spacing {
    padding-inline: calc(var(--spacing) * 6);
    max-width: var(--container-4xl);
    margin-inline: auto;

    .heading {
      display: flex;
      gap: calc(var(--spacing) * 4);
      justify-content: space-between;
      align-items: baseline;
      flex-wrap: wrap;
      margin-bottom: calc(var(--spacing) * 14);

      h2 {
        font-family: "Libre Baskerville", Georgia, serif;
        font-size: clamp(1.4rem, 2.5vw, 1.9rem);
        font-weight: 400;
        color: var(--foreground);
        letter-spacing: -0.01em;
      }

      a {
        display: flex;
        align-items: center;
        gap: calc(var(--spacing) * 1);
        font-size: var(--text-sm);
        line-height: var(--tw-leading, var(--text-sm--line-height));
        color: var(--muted-foreground);

        svg {
          width: 13px;
          height: 13px;
          fill: none;
        }

        &:hover {
          color: var(--accent);

          svg {
            --tw-translate-y: calc(var(--spacing) * -0.5);
            --tw-translate-x: calc(var(--spacing) * 0.5);
            translate: var(--tw-translate-x) var(--tw-translate-y);
            /* translate: var(--tw-translate-x) var(--tw-translate-y); */
            fill: none;
          }
        }
      }
    }

    .spacing_block {
      :where(& > :not(:last-child)) {
        margin-block-end: 56px;
      }

      div {
        h3 {
          font-family: Inter, sans-serif;
          font-size: 0.7rem;
          text-transform: uppercase;
          color: var(--muted-foreground);
          --tw-tracking: 0.15em;
          letter-spacing: 0.15em;
          margin-bottom: calc(var(--spacing) * 6);
          font-weight: var(--font-weight-medium);
          line-height: 1.5;
        }

        a {
          padding-block: calc(var(--spacing) * 4);
          display: flex;
          align-items: flex-start;
          justify-content: space-between;
          gap: calc(var(--spacing) * 4);
          border-bottom-style: var(--tw-border-style);
          border-bottom-width: 1px;
          border-color: var(--border);

          div {
            :first-child {
              transition-property: color, fill, opacity;
              transition-timing-function: var(--ease-out);
              transition-duration: 200ms;
              font-family: "Libre Baskerville", Georgia, serif;
              font-size: 0.9rem;
              line-height: 1.55;
              color: var(--foreground);
              margin-bottom: calc(var(--spacing) * 1);
            }

            :nth-child(2) {
              font-family: Inter, sans-serif;
              font-size: 0.8rem;
              color: var(--muted-foreground);

              :first-child {
                opacity: 40%;
                margin-inline: calc(var(--spacing) * 2);
              }

              :last-child {
                font-style: italic;
              }
            }
          }

          svg {
            width: 13px;
            height: 13px;
            opacity: 0;
            transform: translateX(-4px);
            fill: none;
          }

          &:hover {
            div {
              :first-child {
                color: var(--accent);
              }
            }

            svg {
              opacity: 1;
              transform: none;
              stroke: var(--accent);
            }
          }
        }
      }
    }
  }
}

/* ------------------ TEACHING  ------------------ */
#teaching {
  border-color: var(--border);
  border-top-style: var(--tw-border-style);
  border-top-width: 1px;
  padding-block: calc(var(--spacing) * 28);

  .spacing {
    padding-inline: calc(var(--spacing) * 6);
    max-width: var(--container-4xl);
    margin-inline: auto;

    h2 {
      font-family: "Libre Baskerville", Georgia, serif;
      font-size: clamp(1.4rem, 2.5vw, 1.9rem);
      font-weight: 400;
      color: var(--foreground);
      letter-spacing: -0.01em;
      margin-bottom: calc(var(--spacing) * 14);
    }

    .grid_layout {
      display: grid;
      grid-template-columns: repeat(1, minmax(0, 1fr));
      gap: 1px;
      background: var(--border);

      @media (width >= 40rem) {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .group {
        background: var(--background);
        padding: calc(var(--spacing) * 7);

        .title {
          display: flex;
          justify-content: space-between;
          align-items: flex-start;
          margin-bottom: calc(var(--spacing) * 3);

          font-family: Inter, sans-serif;
          font-size: var(--text-xs);

          div {
            span:first-child {
              text-transform: uppercase;
              color: var(--accent);
              letter-spacing: 0.14rem;
              margin-right: calc(var(--spacing) * 3);
            }

            span:nth-child(2) {
              color: var(--muted-foreground);
              line-height: 16px;
            }
          }

          a {
            opacity: 0;
            transition-property: opacity;
            transition-duration: 200ms;
            color: var(--muted-foreground);

            svg {
              width: 11px;
              height: 11px;
              fill: none;
              stroke: currentColor;
            }

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

        h3 {
          font-family: "Libre Baskerville", Georgia, serif;
          font-size: 1rem;
          font-weight: 700;
          color: var(--foreground);
          line-height: 1.35;
          margin-bottom: calc(var(--spacing) * 2);
        }

        p {
          font-family: Inter, sans-serif;
          color: var(--muted-foreground);
          font-size: var(--text-xs);
          line-height: var(--tw-leading, var(--text-xs--line-height));
          margin-bottom: calc(var(--spacing) * 3);

          & + p {
            font-size: 0.83rem;
            line-height: 1.7;
          }
        }

        &:hover {
          a {
            opacity: 1;
          }
        }
      }
    }
  }
}

/* ------------------ TALKS  ------------------ */
#talks {
  border-color: var(--border);
  border-top-style: var(--tw-border-style);
  border-top-width: 1px;
  padding-block: calc(var(--spacing) * 28);

  .spacing {
    padding-inline: calc(var(--spacing) * 6);
    max-width: var(--container-4xl);
    margin-inline: auto;

    h2 {
      font-family: "Libre Baskerville", Georgia, serif;
      font-size: clamp(1.4rem, 2.5vw, 1.9rem);
      font-weight: 400;
      color: var(--foreground);
      letter-spacing: -0.01em;
      margin-bottom: calc(var(--spacing) * 14);
    }

    .group {
      display: flex;
      flex-direction: column;
      padding-block: calc(var(--spacing) * 5);
      border-bottom-width: 1px;
      border-bottom-style: var(--tw-border-style);
      border-color: var(--border);

      @media (width >= 40rem) {
        flex-direction: row;
        gap: calc(var(--spacing) * 8);
        align-items: baseline;
      }

      div:first-child {
        font-family: Inter, sans-serif;
        font-size: 0.78rem;
        color: var(--muted-foreground);
        flex-shrink: 0;

        @media (width >= 40rem) {
          width: calc(var(--spacing) * 28);
          margin-bottom: calc(var(--spacing) * 0);
        }
      }

      div:nth-child(2) {
        flex: 1;
        min-width: calc(var(--spacing) * 0);

        p:first-child {
          font-family: "Libre Baskerville", Georgia, serif;
          font-size: 0.9rem;
          line-height: 1.5;
          transition-property: color;
          --tw-duration: 200ms;
          transition-duration: 200ms;
          color: var(--foreground);
          margin-bottom: calc(var(--spacing) * 1);
        }

        p:nth-child(2) {
          font-family: Inter, sans-serif;
          font-size: 0.8rem;
          color: var(--muted-foreground);

          span {
            opacity: 40%;
            margin-inline: calc(var(--spacing) * 2);
          }
        }
      }

      div:nth-child(3) {
        display: none;

        @media (width >= 40rem) {
          display: block;

          span {
            font-family: Inter, sans-serif;
            border: 1px solid var(--border);
            border-radius: calc(var(--radius) - 4px);
            font-size: var(--text-xs);
            line-height: var(--tw-leading, var(--text-xs--line-height));
            padding-block: calc(var(--spacing) * 0.5);
            padding-inline: calc(var(--spacing) * 2);

            &[data-status="invited"] {
              background: var(--muted);
              color: var(--accent);
            }

            &[data-status="contributed"] {
              background: transparent;
              color: var(--muted-foreground);
            }
          }
        }
      }

      &:hover {
        div:nth-child(2) {
          p:first-child {
            color: var(--accent);
          }
        }
      }
    }
  }
}

/* ------------------ CONTACT  ------------------ */
footer {
  border-color: var(--border);
  border-top-style: var(--tw-border-style);
  border-top-width: 1px;
  padding-block: calc(var(--spacing) * 28);

  .spacing {
    padding-inline: calc(var(--spacing) * 6);
    max-width: var(--container-4xl);
    margin-inline: auto;

    h2 {
      font-family: "Libre Baskerville", Georgia, serif;
      font-size: clamp(1.4rem, 2.5vw, 1.9rem);
      font-weight: 400;
      color: var(--foreground);
      letter-spacing: -0.01em;
      margin-bottom: calc(var(--spacing) * 14);

      & + p {
        font-family: Inter, sans-serif;
        font-size: 0.9rem;
        line-height: 1.8;
        color: var(--muted-foreground);
        max-width: var(--container-md);
        margin-bottom: calc(var(--spacing) * 10);
      }
    }

    .contact_links {
      display: flex;
      flex-direction: column;
      margin-bottom: calc(var(--spacing) * 20);
      gap: calc(var(--spacing) * 4);

      @media (width >= 40rem) {
        flex-direction: row;
        gap: calc(var(--spacing) * 8);
      }

      a {
        font-family: Inter, sans-serif;
        font-size: var(--text-sm);
        display: flex;
        gap: calc(var(--spacing) * 2);
        align-items: center;

        span {
          position: relative;

          &::after {
            position: absolute;
            bottom: -2px;
            left: 0px;
            content: "";
            width: 0;
            border-bottom: 1px solid var(--ring);
            transition-property: width;
            transition-timing-function: var(--ease-out);
            transition-duration: 0.3s;
          }
        }
      }

      a:hover {
        span::after {
          width: 100%;
        }
      }
    }

    .date_of_update {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: calc(var(--spacing) * 4);

      p {
        font-family: Inter, sans-serif;
        color: var(--muted-foreground);
        font-size: var(--text-xs);
        line-height: var(--tw-leading, var(--text-xs--line-height));
      }
    }
  }
}

@container scroller scroll-state(scrollable: top) {
  header {
    border-bottom: 1px solid var(--border);
  }
}