.book-page { background: #fff; }
.book-container { max-width: 1120px; margin: auto; padding: 30px 24px 80px; }
.book-hero { display: grid; grid-template-columns: minmax(250px, .7fr) minmax(0, 1.3fr); align-items: center; gap: 80px; padding: 70px 0 85px; }
.book-cover-wrap { max-width: 335px; margin: auto; padding: 12px; border: 1px solid #d8e2ef; border-radius: 18px; background: #f4f8fc; box-shadow: 0 25px 55px rgba(8, 24, 45, .16); }
.book-cover-wrap img { display: block; width: 100%; height: auto; border-radius: 9px; }
.book-hero-copy h1 { max-width: 720px; margin: 13px 0 18px; color: #08182d; font-size: clamp(42px, 5.4vw, 68px); line-height: 1.02; letter-spacing: -.055em; }
.book-subtitle { color: #1475f5 !important; font-size: 22px !important; font-weight: 750; line-height: 1.35 !important; }
.book-hero-copy > p:not(.seo-eyebrow) { max-width: 650px; color: #405169; font-size: 18px; }
.book-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.book-button { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 52px; padding: 0 20px; border: 1px solid transparent; border-radius: 12px; font-size: 14px; font-weight: 800; text-decoration: none; transition: transform .2s ease, box-shadow .2s ease; }
.book-button:hover { transform: translateY(-2px); }
.book-button-amazon { color: #fff; background: #1475f5; box-shadow: 0 12px 25px rgba(20, 117, 245, .22); }
.book-button-chatnex { color: #fff; background: #0b294b; box-shadow: 0 12px 25px rgba(8, 24, 45, .18); }
.book-section { margin-top: 30px; padding: 70px 0; border-top: 1px solid #dfe8f2; }
.book-kicker { margin: 0 0 12px; color: #1475f5; font-size: 12px; font-weight: 850; letter-spacing: .14em; text-transform: uppercase; }
.book-section h2, .book-application h2 { max-width: 780px; margin: 0 0 18px; color: #08182d; font-size: clamp(30px, 4vw, 48px); line-height: 1.1; letter-spacing: -.04em; }
.book-section > p:not(.book-kicker) { max-width: 780px; color: #405169; font-size: 18px; }
.book-principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 38px; }
.book-principles article { padding: 24px; border: 1px solid #dfe8f2; border-radius: 16px; background: #fff; }
.book-principles b { color: #1475f5; font-size: 13px; }
.book-principles h3 { margin: 16px 0 8px; font-size: 19px; }
.book-principles p { margin: 0; color: #5d6c80; line-height: 1.6; }
.book-application { display: grid; grid-template-columns: .9fr 1.1fr; gap: 70px; margin-top: 20px; padding: 70px 42px; border-radius: 24px; color: #fff; background: linear-gradient(135deg, #071c39, #0d4b76); }
.book-application h2 { color: #fff; }
.book-application-list { display: grid; gap: 14px; }
.book-application-list p { margin: 0; padding: 15px 18px; border-left: 3px solid #38bdf8; color: #d8e8f7; background: rgba(255, 255, 255, .07); }
.book-application-list b { color: #fff; }
.book-cta { text-align: center; }
.book-cta h2, .book-cta > p:not(.book-kicker) { margin-inline: auto; }
.book-cta .book-actions { justify-content: center; }
@media (max-width: 800px) { .book-hero { grid-template-columns: 1fr; gap: 38px; padding: 48px 0 62px; } .book-hero-copy h1 { font-size: 42px; } .book-principles, .book-application { grid-template-columns: 1fr; } .book-application { gap: 28px; padding: 42px 24px; } }
@media (max-width: 520px) { .book-container { padding-inline: 17px; } .book-hero-copy h1 { font-size: 36px; } .book-subtitle { font-size: 19px !important; } .book-actions, .book-button { width: 100%; } }