.home {
  padding-bottom: 72px;
}

.home-hero {
  padding: 42px 0 30px;
}

.home-hero h1,
.category-header h1 {
  margin: 0;
  font-family: Georgia, "Times New Roman", "Apple SD Gothic Neo", serif;
  letter-spacing: -0.04em;
}

.home-hero h1 {
  font-size: clamp(2.25rem, 10vw, 4.4rem);
  line-height: 0.98;
}

.home-hero > p:last-child,
.category-header p {
  color: var(--muted);
  line-height: 1.65;
}

.series-grid {
  display: grid;
  gap: 14px;
}

.series-card {
  display: grid;
  min-height: 172px;
  align-content: end;
  gap: 8px;
  padding: 24px;
  overflow: hidden;
  border: 1px solid rgba(21, 34, 28, 0.1);
  border-radius: 26px;
  box-shadow: var(--shadow);
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.series-card:active {
  transform: translateY(2px);
}

.toeic-card {
  background: linear-gradient(145deg, #fff8d9, #dcefe4);
}

.advanced-card {
  background: linear-gradient(145deg, #e7f0ff, #e5f2e2);
}

.series-card .series-name {
  color: var(--green);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.1em;
}

.series-card strong {
  font-size: clamp(1.35rem, 6vw, 2rem);
}

.series-card > span:last-child {
  color: var(--muted);
  font-weight: 750;
}

.category-page .back-link {
  margin: 8px 0 28px;
}

.category-header {
  margin-bottom: 24px;
}

.category-header h1 {
  font-size: clamp(1.75rem, 7vw, 3rem);
  line-height: 1.08;
}

.category-header p {
  margin: 10px 0 0;
}

.puzzle-list {
  gap: 12px;
}

.puzzle-list a {
  min-height: 88px;
}

.puzzle-copy {
  display: grid;
  gap: 7px;
  min-width: 0;
}

.puzzle-copy strong {
  line-height: 1.25;
}

.puzzle-copy time {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.open-label {
  flex: 0 0 auto;
  color: var(--green) !important;
  font-weight: 850;
  white-space: nowrap;
}

.empty-list {
  padding: 36px 20px;
  border: 1px dashed var(--line);
  border-radius: 20px;
  color: var(--muted);
  text-align: center;
}

@media (min-width: 700px) {
  .series-grid {
    grid-template-columns: 1fr 1fr;
  }

  .series-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 50px rgba(33, 56, 44, 0.16);
  }
}