/* ——— Captain's Letter (§01) ——— */
.letter-section {
  background: var(--paper-warm);
  padding: 140px 0;
  position: relative;
  border-bottom: 1px solid var(--paper-line);
}
.letter-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 64px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--paper-line);
}
.letter-tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--brass);
  opacity: 0.8;
}
.letter-body {
  display: grid;
  grid-template-columns: 1fr 1.8fr;
  gap: 72px;
  align-items: start;
}
.letter-card {
  background: var(--paper);
  border: 1px solid var(--paper-line);
  padding: 8px;
  position: sticky;
  top: 100px;
  box-shadow: 0 1px 0 rgba(10, 22, 36, 0.04), 0 24px 40px -28px rgba(10, 22, 36, 0.18);
}
.letter-card-photo {
  position: relative;
  aspect-ratio: 3 / 4;
  background: var(--navy-700);
  background-image: repeating-linear-gradient(135deg, rgba(244,239,230,0.05) 0 2px, transparent 2px 14px);
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}
.letter-card-photo .silhouette {
  position: absolute;
  bottom: 0;
  width: 70%;
  height: 82%;
}
.letter-card-tag {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(244,239,230,0.45);
  padding: 4px 8px;
  border: 1px solid rgba(244,239,230,0.15);
  white-space: nowrap;
}
.letter-card-body {
  padding: 18px 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.letter-card-role {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--brass);
}
.letter-card-name {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 300;
  line-height: 1.1;
  margin-top: 4px;
}
.letter-card-origin {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.5;
  margin-top: 2px;
}

.letter-copy {
  max-width: 58ch;
  font-family: var(--serif);
  font-weight: 300;
  color: var(--ink);
}
.letter-copy .letter-lead {
  font-size: clamp(28px, 3vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  margin-bottom: 36px;
  color: var(--ink);
}
.letter-copy .letter-lead em {
  font-style: italic;
  color: var(--brass);
}
.letter-copy p {
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin-bottom: 20px;
  text-wrap: pretty;
}
.letter-sign {
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px dashed var(--paper-line);
  display: flex;
  align-items: flex-end;
  gap: 28px;
}
.letter-sign-mark {
  width: 180px;
  flex-shrink: 0;
}
.letter-signature {
  width: 100%;
  height: auto;
  display: block;
}
.letter-sign-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-bottom: 6px;
}
.letter-sign-name {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 400;
}
.letter-sign-title {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--brass);
  opacity: 0.8;
}

.letter-foot {
  margin-top: 80px;
  padding-top: 28px;
  border-top: 1px solid var(--paper-line);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}
.letter-foot-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.letter-foot-item .k {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--brass);
}
.letter-foot-item .v {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 300;
  color: var(--ink);
}

@media (max-width: 900px) {
  .letter-body { grid-template-columns: 1fr; gap: 40px; }
  .letter-card { position: static; max-width: 280px; }
  .letter-head { flex-direction: column; align-items: flex-start; gap: 12px; }
  .letter-foot { grid-template-columns: 1fr; gap: 20px; }
  .letter-sign { flex-direction: column; align-items: flex-start; gap: 16px; }
}