/* hero section */
.post-header {
  width: 100vw;
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);

  background: linear-gradient(135deg, var(--yin-dark) 0%, #3b4a7a 100%);

  text-align: center;
  padding: 3rem 1rem;
}
.post-header h1{
  font-size: 3rem !important;
  font-weight: 700 !important;

  color: white;
  margin-bottom: 0;
}
.post-header .subtitle {
  margin-top: 1.0rem;
  font-size: 1.2rem;
  font-weight: 400;
  color: rgba(255,255,255,0.9);
  letter-spacing: -1px;
}

/* seminar page */
#bulletin-board h3 {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding-right: 150px; 
  font-size: 1.2em;
}

.tags {
  position: absolute;
  top: 0.8rem;
  right: 0.9rem;

  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: flex-end;
}
.tag {
  font-size: 1.1em;
  font-weight: 700;
  color: black;
  background: #eef2ff;
  padding: 2px 8px;
  border-radius: 6px;
  white-space: nowrap;
  margin-top: 0.2rem;
}
@media (max-width: 768px) {
  .hero-section-fullscreen {
    background: linear-gradient(135deg, rgba(30, 42, 58, 0.85), rgba(212, 165, 116, 0.3)), url('{{ "/images/hero_simple.png" | relative_url }}') 80% center/100% no-repeat;
  }
}
#bulletin-board dl{
  position: relative;
  display: grid;
  grid-gap: 4px 16px;
  grid-template-columns: minmax(20ch, max-content) 1fr;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 0.2rem 0.5rem 0.5rem;
  margin-bottom: 0.5em;
  transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}
#bulletin-board dl:hover{
  border-color: var(--accent-color);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}
#bulletin-board dt
{
  background: var(--accent-color);
  color: var(--yang-light);
  padding: 0.2rem 0.5rem;
  margin-top: 0.3rem;
  border-radius: 4px;
  font-weight: 600;
  font-size: 1.5rem;
  letter-spacing: 0.5px;
  display: inline-block;
  align-self: start;
  white-space: nowrap;
  width: minmax(20ch, max-content);
  overflow: visible;
  text-align: right;
}
#bulletin-board dd
{
  background: white;
  color: var(--text-primary) !important;
  padding: 0.2rem 0.5rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.5px;
  margin-top: 0.3rem;
  display: inline-block;
  grid-column-start: 2;
}

/* mobile env*/ 
@media (max-width: 768px) {
  #bulletin-board h3 {
    padding-right: 0;              /* remove reserved space */
    flex-direction: column;        /* stack */
    align-items: flex-start;
  }

  .tags {
    position: static;              /* 👈 back into flow (inside h3) */
    display: flex;
    flex-direction: row;           /* or column if you prefer */
    gap: 6px;
    margin-top: 4px;

    align-self: flex-end;          /* 👈 keep them right-aligned */
  }
  
  #bulletin-board dl {
    grid-template-columns: 1fr;   /* single column */
  }

  #bulletin-board dt {
    grid-column: 1;              /* ensure full width */
    text-align: left;            /* optional: better for mobile */
    width: auto;                 /* override your fixed width */
  }

  #bulletin-board dd {
    grid-column: 1;
  }
}

#bulletin-board li > details {
  list-style: none;
}
#bulletin-board li:has(> details) {
  list-style: none;
}

#bulletin-board details[open] summary::after {
  content: attr(data-open);
}

#bulletin-board details:not([open]) summary::after {
  content: attr(data-close);
}