.letters-hero {
  padding-bottom: 18px;
}

.letters-page-wrap {
  padding: 8px 0 40px;
}

.letters-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(320px, 0.8fr);
  gap: 18px;
  align-items: start;
}

.letters-main-card,
.letters-side-card {
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(14px);
  border-radius: 24px;
}

.letters-main-card {
  padding: 18px;
}

.letters-side-stack {
  display: grid;
  gap: 16px;
}

.letters-side-card {
  padding: 16px;
}

.letters-topbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.letters-info-chip,
.mini-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel-solid) 92%, transparent);
  color: var(--text);
  font-size: 13px;
  font-weight: 700;
}

.letters-info-chip {
  padding: 10px 14px;
}

.letters-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0,1fr));
  gap: 12px;
}

.letter-card {
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 18px 14px;
  background: color-mix(in srgb, var(--panel-solid) 94%, transparent);
  text-align: center;
}

.letter-card strong {
  display: block;
  font-size: 28px;
  line-height: 1;
  margin-bottom: 10px;
}

.letter-card span {
  display: block;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.5;
  word-break: break-word;
}

.memory-seq-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.mini-chip {
  padding: 8px 12px;
}

.example-list {
  display: grid;
  gap: 10px;
}

.example-list div {
  display: grid;
  grid-template-columns: 82px 1fr;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 14px;
  background: var(--surface-2);
  border: 1px solid var(--line);
}

.example-list span,
.study-note-list li {
  color: var(--muted);
  line-height: 1.7;
  font-size: 14px;
}

.study-note-list {
  margin: 0;
  padding-left: 18px;
}

.letters-support-section {
  padding: 8px 0 42px;
}

.letters-support-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 16px;
}

@media (max-width: 1080px) {
  .letters-layout,
  .letters-support-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .letters-grid {
    grid-template-columns: repeat(2, minmax(0,1fr));
  }

  .letters-topbar {
    flex-direction: column;
    align-items: stretch;
  }
}