:root {
  --heading-color: #2e1670;
  --body-color: #012b55;
  --bg-color: #ffffff;
  --sidebar-width: 280px;
  --font-heading: "bjpg", "Quicksand", sans-serif;
  --font-body: "ftnk", "Comfortaa", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  color: var(--body-color);
  background: var(--bg-color);
  line-height: 1.6;
}

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

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  display: block;
}

h1,
h2,
h3 {
  font-family: var(--font-heading);
  color: var(--heading-color);
  font-weight: 600;
}

/* ---------- Layout ---------- */

.page {
  display: flex;
  align-items: flex-start;
  min-height: 100vh;
}

/* ---------- Sidebar / nav ---------- */

#nav-root {
  flex: 0 0 var(--sidebar-width);
  width: var(--sidebar-width);
  padding: 2.5rem 1.5rem;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.nav-logo {
  width: 100%;
  max-width: 220px;
  border-radius: 4px;
  margin: 0 auto 2rem;
}

.nav-links {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.95rem;
}

.nav-links li {
  margin-bottom: 0.65rem;
}

.nav-links .nav-top-level {
  font-weight: 700;
  margin-top: 1.25rem;
}

.nav-links .nav-top-level:first-child {
  margin-top: 0;
}

.nav-links .nav-sub {
  padding-left: 1rem;
  font-weight: 400;
}

.nav-links a.active {
  color: var(--heading-color);
  font-weight: 700;
}

.nav-hamburger {
  display: none;
}

/* ---------- Main content ---------- */

main {
  flex: 1 1 auto;
  min-width: 0;
  padding: 3rem 3.5rem 5rem;
}

.page-title {
  font-size: 2.75rem;
  text-align: center;
  margin: 0 0 1.5rem;
}

.page-subtitle {
  font-size: 1.15rem;
  text-align: center;
  color: var(--body-color);
  max-width: 900px;
  margin: 0 auto 2rem;
}

.hero-intro {
  font-size: 1.25rem;
  color: var(--heading-color);
  text-align: center;
  max-width: 850px;
  margin: 0 auto 3rem;
}

.body-copy {
  max-width: 820px;
  margin: 0 auto 2rem;
  text-align: center;
}

.body-copy h2 {
  font-size: 1.4rem;
  margin-top: 2.5rem;
}

.body-copy p {
  margin: 1rem 0;
}

.meta-line {
  text-align: center;
  color: var(--body-color);
  opacity: 0.8;
  margin: 0.25rem 0;
}

/* ---------- Image grid / gallery ---------- */

.image-grid {
  columns: 3 260px;
  column-gap: 1rem;
  margin-top: 2rem;
}

.image-grid img,
.image-grid figure {
  margin: 0 0 1rem;
  break-inside: avoid;
}

.image-grid figure {
  margin: 0 0 1rem;
}

.image-grid figcaption {
  font-size: 0.85rem;
  text-align: center;
  padding-top: 0.35rem;
  opacity: 0.8;
}

/* ---------- Index cards (Research Work / Design Work) ---------- */

.index-heading {
  text-align: center;
  font-size: 1.5rem;
  margin-bottom: 2.5rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
  max-width: 1000px;
  margin: 0 auto;
}

.card {
  text-align: center;
}

.card img {
  border-radius: 4px;
  margin-bottom: 0.75rem;
}

.card .card-year {
  font-size: 0.85rem;
  opacity: 0.75;
}

.card .card-title {
  font-family: var(--font-heading);
  color: var(--heading-color);
  font-weight: 600;
}

/* ---------- About Me ---------- */

.about-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
  max-width: 1200px;
  margin: 0 auto;
}

.about-photo {
  background-size: cover;
  background-position: center;
  min-height: 500px;
  border-radius: 4px;
}

.about-text h1 {
  font-size: 2.25rem;
  margin-bottom: 1.5rem;
}

.about-text h2 {
  font-size: 1.4rem;
}

.contact-block {
  max-width: 820px;
  margin: 3rem auto 0;
  text-align: center;
}

/* ---------- You may also like ---------- */

.related {
  max-width: 820px;
  margin: 3rem auto 0;
  text-align: center;
}

.related h2 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.related-list {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  list-style: none;
  padding: 0;
}

.related-list .rel-year {
  display: block;
  font-size: 0.8rem;
  opacity: 0.75;
}

/* ---------- Scroll to top ---------- */

.scroll-top {
  position: fixed;
  right: 1.75rem;
  bottom: 1.75rem;
  width: 46px;
  height: 46px;
  border-radius: 8px;
  background: #eef0f4;
  color: var(--heading-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  border: none;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.scroll-top.visible {
  opacity: 1;
  pointer-events: auto;
}

/* ---------- Mobile ---------- */

@media (max-width: 800px) {
  .page {
    display: block;
  }

  #nav-root {
    position: static;
    width: 100%;
    height: auto;
    padding: 1.5rem;
    text-align: center;
  }

  .nav-logo {
    max-width: 120px;
    margin-bottom: 0;
  }

  .nav-hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    position: absolute;
    top: 1.75rem;
    right: 1.5rem;
    width: 34px;
    height: 34px;
    background: none;
    border: none;
    cursor: pointer;
  }

  .nav-hamburger span {
    display: block;
    height: 3px;
    background: var(--heading-color);
    border-radius: 2px;
  }

  #nav-root {
    position: relative;
  }

  .nav-links {
    display: none;
    text-align: left;
    max-width: 320px;
    margin: 1.5rem auto 0;
  }

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

  main {
    padding: 2rem 1.25rem 4rem;
  }

  .page-title {
    font-size: 2rem;
  }

  .about-layout {
    grid-template-columns: 1fr;
  }

  .about-photo {
    min-height: 320px;
  }

  .image-grid {
    columns: 3 100px;
  }
}