.kakuro-book { background: #0d1721; color: #f5f2e9; }
.kakuro-book h1,
.kakuro-book h2,
.kakuro-book h3 { font-family: "Playfair Display", Georgia, serif; font-weight: 500; }
.kakuro-book .eyebrow { color: #e3b65e; }
.kakuro-book-hero { background: linear-gradient(120deg, #111e2b, #253044); padding: clamp(4rem, 8vw, 7rem) 1.25rem; }
.kakuro-book-hero-inner { align-items: center; display: grid; gap: clamp(2rem, 7vw, 7rem); grid-template-columns: minmax(0, 1.2fr) minmax(240px, .7fr); margin: 0 auto; max-width: 1200px; }
.kakuro-book h1 { font-size: clamp(3.5rem, 7vw, 7rem); letter-spacing: -.06em; line-height: .92; margin: .7rem 0 1.5rem; }
.kakuro-book-lead { color: #d3dce5; font-family: "Playfair Display", Georgia, serif; font-size: clamp(1.2rem, 2vw, 1.55rem); line-height: 1.5; max-width: 670px; }
.kakuro-book-hero img { filter: drop-shadow(20px 25px 22px #0008); max-height: 520px; max-width: 100%; object-fit: contain; width: 100%; }
.kakuro-book-actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2rem; }
.kakuro-book-actions a { border: 1px solid #e3b65e; color: #f5e5bb; display: inline-block; font-size: .78rem; font-weight: 700; letter-spacing: .08em; padding: .9rem 1.2rem; text-decoration: none; }
.kakuro-book-actions a:first-child { background: #e3b65e; color: #18232b; }
.kakuro-book-facts { display: grid; gap: 1rem; grid-template-columns: repeat(3, 1fr); list-style: none; margin: 2.5rem 0 0; padding: 0; }
.kakuro-book-facts li { border-top: 1px solid #8f9cab66; color: #cbd5de; padding-top: .8rem; }
.kakuro-book-facts strong { color: #fff8ed; display: block; font-size: 1.35rem; }
.kakuro-book-details { margin: 0 auto; max-width: 1200px; padding: clamp(3.5rem, 7vw, 6rem) 1.25rem; }
.kakuro-book-details h2,
.kakuro-book-faq h2 { font-size: clamp(2rem, 4vw, 3.6rem); letter-spacing: -.045em; line-height: 1.08; margin: .4rem 0 1.3rem; }
.kakuro-book-details > p { color: #c4ccd5; font-size: 1.08rem; line-height: 1.75; max-width: 760px; }
.kakuro-book-feature-grid { display: grid; gap: 1rem; grid-template-columns: repeat(3, 1fr); margin-top: 2.5rem; }
.kakuro-book-feature-grid article { background: #172634; border: 1px solid #354655; padding: 1.5rem; }
.kakuro-book-feature-grid h3 { font-size: 1.6rem; margin: .4rem 0 .8rem; }
.kakuro-book-feature-grid p { color: #bcc8d3; line-height: 1.6; margin: 0; }
.kakuro-book-faq { background: #111e2b; padding: clamp(3.5rem, 7vw, 6rem) 1.25rem; }
.kakuro-book-faq-inner { margin: 0 auto; max-width: 920px; }
.kakuro-book-faq details { border-bottom: 1px solid #344657; padding: 1.15rem 0; }
.kakuro-book-faq summary { cursor: pointer; font-weight: 700; }
.kakuro-book-faq details p { color: #c4ccd5; line-height: 1.65; }

@media (max-width: 760px) {
  .kakuro-book-hero-inner { grid-template-columns: 1fr; }
  .kakuro-book-hero img { grid-row: 1; max-height: 380px; }
  .kakuro-book-feature-grid { grid-template-columns: 1fr; }
}

@media (max-width: 500px) {
  .kakuro-book-facts { grid-template-columns: 1fr; }
}