.case-file {
  width: 100%;
  max-width: 720px;
  position: relative;
  background: rgba(212, 197, 160, 0.04);
  border: 1px solid rgba(212, 197, 160, 0.12);
  padding: 2.5rem 1.75rem 2rem;
  box-shadow: 0 12px 40px var(--noir-shadow), inset 0 0 60px rgba(0, 0, 0, 0.3);
}

.case-header {
  text-align: center;
  border-bottom: 1px dashed rgba(212, 197, 160, 0.3);
  padding-bottom: 1.25rem;
  margin-bottom: 1.75rem;
}

.case-header .case-no {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  color: var(--noir-paper-dim);
  margin-bottom: 0.5rem;
}

.case-header h1 {
  font-size: clamp(1.5rem, 5vw, 2.25rem);
  color: var(--noir-paper);
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.5);
}

.case-header h1 .accent {
  color: var(--noir-blood);
}

.briefing {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 2.5vw, 1.125rem);
  line-height: 1.75;
  margin-bottom: 2rem;
}

.briefing p {
  margin-bottom: 1rem;
}

.briefing .signature {
  font-style: italic;
  color: var(--noir-gold);
  text-align: right;
  margin-top: 1.25rem;
}

.groups {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

@media (min-width: 560px) {
  .groups {
    grid-template-columns: 1fr 1fr;
  }
}

.group-stamp {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 110px;
  padding: 1rem 0.75rem;
  text-align: center;
  font-family: var(--font-mono);
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--noir-paper);
  background: rgba(0, 0, 0, 0.25);
  border: 3px double currentColor;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  cursor: pointer;
  text-decoration: none;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.45);
}

.group-stamp .label {
  font-size: 0.7rem;
  opacity: 0.7;
  letter-spacing: 0.25em;
  margin-bottom: 0.25rem;
}

.group-stamp .name {
  font-size: clamp(0.95rem, 3vw, 1.15rem);
  line-height: 1.2;
}

.group-stamp.green   { color: #6a9c4a; transform: rotate(-2deg); }
.group-stamp.red     { color: #c14848; transform: rotate(1.5deg); }
.group-stamp.blue    { color: #5a82b8; transform: rotate(-1deg); }
.group-stamp.alfa    {
  color: #b97acc;
  transform: rotate(2deg);
  background:
    linear-gradient(135deg, rgba(106, 156, 74, 0.12), rgba(193, 72, 72, 0.12), rgba(90, 130, 184, 0.12), rgba(185, 122, 204, 0.18));
}

.group-stamp:hover,
.group-stamp:active {
  transform: rotate(0deg) scale(1.03);
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.6);
}

.case-footer {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  color: var(--noir-paper-dim);
  border-top: 1px dashed rgba(212, 197, 160, 0.2);
  padding-top: 1rem;
  margin-top: 1rem;
}

.coffee-stain.s1 { top: 12%; right: -40px; }
.coffee-stain.s2 { bottom: 8%; left: -50px; width: 140px; height: 140px; }