/* ── BOOKS INTRO ───────────────────────────────────────────── */
.books-intro {
  padding: 8rem 5rem 5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10rem;
  align-items: end;
  border-bottom: 0.05rem solid var(--gray);
}
.books-intro-heading {
  font-size: 11rem;
  font-weight: 800;
  letter-spacing: -0.5rem;
  line-height: 0.85;
}
.books-intro-heading .outline {
  display: block;
  color: transparent;
  -webkit-text-stroke: 0.08rem var(--gray);
}
.books-intro-body {
  font-size: 1.6rem;
  line-height: 1.7;
  opacity: 0.5;
  font-weight: 400;
  letter-spacing: -0.03rem;
  text-transform: none;
}

/* ── BOOKS GRID ────────────────────────────────────────────── */
.books-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-bottom: 0.05rem solid var(--gray);
}

.book-card {
  padding: 5rem;
  border-right: 0.05rem solid var(--gray);
  display: flex;
  flex-direction: column;
  gap: 3rem;
  cursor: none;
  transition: background 0.3s;
}
.book-card:last-child { border-right: none; }
.book-card:hover { background: rgba(255,255,255,0.02); }

.book-num {
  font-size: 1rem;
  opacity: 0.25;
  font-family: 'Syne Mono', monospace;
  letter-spacing: 0.15rem;
}

.book-cover {
  aspect-ratio: 3/4;
  border-radius: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}
.book-cover-01 { background: linear-gradient(135deg, #1a1a14 0%, #2a2a1a 100%); }
.book-cover-02 { background: linear-gradient(135deg, #0f1a1a 0%, #1a2a28 100%); }
.book-cover-03 { background: linear-gradient(135deg, #1a0f14 0%, #2a1a20 100%); }

.book-cover-text {
  font-size: 1rem;
  letter-spacing: 0.3rem;
  opacity: 0.15;
  text-align: center;
  padding: 3rem;
  line-height: 2;
}
.book-cover-accent {
  position: absolute;
  bottom: 2rem; right: 2rem;
  width: 6rem; height: 6rem;
  border-radius: 50%;
  opacity: 0.08;
}
.book-cover-01 .book-cover-accent { background: var(--accent); }
.book-cover-02 .book-cover-accent { background: #7ad4c8; }
.book-cover-03 .book-cover-accent { background: #d47a8f; }

.book-title {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.1rem;
  line-height: 0.95;
}
.book-subtitle {
  font-size: 1.1rem;
  opacity: 0.3;
  letter-spacing: 0.1rem;
  font-family: 'Syne Mono', monospace;
}
.book-desc {
  font-size: 1.3rem;
  line-height: 1.7;
  opacity: 0.45;
  font-weight: 400;
  letter-spacing: -0.02rem;
  text-transform: none;
  flex: 1;
}
.book-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  font-size: 1.1rem;
  letter-spacing: 0.1rem;
  border-bottom: 0.05rem solid var(--gray);
  padding-bottom: 0.4rem;
  opacity: 0.4;
  transition: opacity 0.2s;
  width: fit-content;
}
.book-cta:hover { opacity: 1; }

/* ── RESPONSIVE ────────────────────────────────────────────── */
@media (max-width: 900px) {
  .books-intro { grid-template-columns: 1fr; gap: 4rem; padding: 6rem 3rem 4rem; }
  .books-intro-heading { font-size: 8rem; letter-spacing: -0.35rem; }
  .books-grid { grid-template-columns: 1fr; }
  .book-card { border-right: none; border-bottom: 0.05rem solid var(--gray); }
  .book-card:last-child { border-bottom: none; }
}
@media (max-width: 600px) {
  .books-intro { padding: 5rem 2rem 3rem; }
  .books-intro-heading { font-size: 6rem; letter-spacing: -0.25rem; }
  .book-card { padding: 3rem 2rem; }
  .book-title { font-size: 2.5rem; }
}
@media (max-width: 400px) {
  .books-intro { padding: 4rem 1.5rem 2.5rem; }
  .book-card { padding: 2.5rem 1.5rem; }
  .books-intro-heading { font-size: 5rem; }
}