body {
  font-family: sans-serif;
  line-height: 1.5;
  margin: 16px;
  color: #e5e7eb;
  background:
    radial-gradient(circle at top, rgba(59, 130, 246, 0.18), transparent 32%),
    #111827;
}

img {
  max-width: 100%;
  height: auto;
}

.hover-underline {
  text-decoration: none;
  color: inherit;
  font-weight: bold;
}

.hover-underline:hover {
  text-decoration: underline;
}

.tags {
  display: none;
}

#toc-container {
  border: 1px solid rgba(202, 218, 255, 0.7);
  border-radius: 14px;
  background: rgba(17, 24, 39, 0.7);
  padding: 0.5rem 1rem;
}

#tocRoot *, a {
  color: white;
  font-style: italic;
  font-family: monospace;
  color: #cadaff;
  text-decoration: none;
}

.banner-panel {
  margin: 1.25rem 0;
  border: 1px solid rgba(148, 163, 184, 0.35);
  border-radius: 22px;
  background: rgba(15, 23, 42, 0.9);
  overflow: hidden;
  box-shadow: 0 12px 35px rgba(15, 23, 42, 0.42);
}

.banner-trigger {
  position: relative;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
  min-height: 180px;
  overflow: hidden;
}

.banner-trigger:hover .banner-image {
  transform: scale(1.12);
}

.banner-image,
.banner-shade {
  position: absolute;
  inset: 0;
}

.banner-image {
  background-size: cover;
  background-position: center;
  filter: blur(1px) brightness(0.75) saturate(0.8);
  transform: scale(1.08);
  transition: transform 180ms ease;
}

.banner-shade {
  background: linear-gradient(90deg, rgba(2, 6, 23, 0.88), rgba(15, 23, 42, 0.42), rgba(15, 23, 42, 0.7));
}

.banner-title,
.banner-caret {
  position: relative;
  z-index: 1;
}

.banner-title {
  padding: 1.5rem 1.25rem;
  font-size: clamp(1.5rem, 2.8vw, 3rem);
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: white;
  text-shadow: 0 6px 18px rgba(0, 0, 0, 0.5);
}

.banner-caret {
  padding: 1.5rem 1.5rem 1.5rem 0;
  font-size: 1.5rem;
  transition: transform 180ms ease;
  color: rgba(255, 255, 255, 0.9);
}

.banner-panel[aria-expanded="true"] .banner-caret {
  transform: rotate(180deg);
}

.banner-panel-body {
  padding: 1.5rem;
  border-top: 1px solid rgba(148, 163, 184, 0.24);
  background: rgba(15, 23, 42, 0.88);
}

.banner-panel-body > :first-child {
  margin-top: 0;
}

.banner-panel[aria-expanded="false"] .banner-panel-body {
  display: none;
}

.content-section {
  display: block;
}

@media (max-width: 640px) {
  body {
    margin: 12px;
  }

  .banner-trigger {
    min-height: 140px;
  }

  .banner-title {
    padding: 1.1rem 1rem;
    letter-spacing: 0.04em;
  }

  .banner-caret {
    padding-right: 1rem;
  }
}

#contact-div {
  display: flex;
  justify-content: center;
  align-items: center;
}
#contact-div div{
  width: 75%;       /* Must have a defined width */
  margin-left: auto;
  margin-right: auto; /* Or use shorthand: margin: 0 auto; */
}