/* ================= BOOK-SPREAD PAGE DESIGN ================= */

.chapter-page {
    background: #4f7680;
    min-height: 100vh;
    font-family: 'Frank Ruhl Libre', serif;
}

.book-outer {
    background: #4f7680;
    padding: 0;
}

.book-scene {
    position: relative;
    padding: 0 0 80px 0;
    background: #4f7680;
}

.book-spread {
    position: relative;
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    min-height: 700px;
    overflow: hidden;
}

.book-page-left {
    width: 120px;
    flex-shrink: 0;
    background: linear-gradient(to left, #dedad2 0%, #eae6de 40%, #f2efe8 100%);
    position: relative;
    box-shadow: inset -8px 0 20px rgba(0,0,0,0.10);
}

.book-spine {
    width: 22px;
    flex-shrink: 0;
    position: relative;
    background: linear-gradient(to right, #b0a898 0%, #d8d2c8 25%, #eceae4 50%, #d4cfc5 75%, #a8a098 100%);
    box-shadow: 0 0 18px rgba(0,0,0,0.28), inset 0 0 8px rgba(0,0,0,0.08);
    z-index: 2;
}

.book-page-right {
    flex: 1;
    background: linear-gradient(to right, #edeae2 0%, #f5f2eb 8%, #faf8f4 40%, #fdfcf9 100%);
    position: relative;
    overflow: hidden;
    box-shadow: 4px 8px 35px rgba(0,0,0,0.20);
}

.book-top-band {
    background: #4f7680;
    height: 50px;
    width: 100%;
    border-bottom: 3px solid #3a5f68;
}

.book-bottom-band {
    background: #4f7680;
    height: 40px;
    width: 100%;
    border-top: 3px solid #3a5f68;
}

.book-page-left::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 8px;
    right: 0;
    height: 6px;
    background: linear-gradient(to bottom, #d0ccc4, #b8b4ac);
    border-radius: 0 0 0 4px;
}

.book-page-right::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    right: 8px;
    height: 6px;
    background: linear-gradient(to bottom, #d0ccc4, #b8b4ac);
    border-radius: 0 0 4px 0;
}

.book-shadow {
    max-width: 920px;
    margin: 0 auto;
    height: 18px;
    background: radial-gradient(ellipse at 50% 0%, rgba(0,0,0,0.35) 0%, transparent 70%);
    position: relative;
    top: -4px;
}

.page-content {
    position: relative;
    z-index: 1;
    padding: 55px 80px 55px 70px;
}

.chapter-title {
    font-family: 'Frank Ruhl Libre', serif;
    font-size: 26px;
    font-weight: 700;
    color: #2a2018;
    text-align: center;
    margin-bottom: 6px;
    letter-spacing: 0.03em;
}

.chapter-subtitle {
    text-align: center;
    font-size: 13px;
    color: #9a9080;
    font-family: 'Heebo', sans-serif;
    font-weight: 300;
    margin-bottom: 18px;
    letter-spacing: 0.05em;
}

.page-divider {
    width: 60px;
    height: 3px;
    background: linear-gradient(to right, #d7b84a, #c9a83a);
    margin: 0 auto 30px;
    border-radius: 2px;
}

.left-page-content {
    opacity: 0;
}

/* ===== RESPONSIVE ===== */

@media (max-width: 1100px) {
    .book-spread {
        max-width: 95%;
    }

    .page-content {
        padding: 45px 60px;
    }
}

@media (max-width: 900px) {
    .book-page-left {
        width: 80px;
    }

    .book-spine {
        width: 18px;
    }

    .page-content {
        padding: 40px 40px;
    }

    .chapter-title {
        font-size: 24px;
    }

    .book-top-band {
        height: 40px;
    }

    .book-bottom-band {
        height: 35px;
    }

    .book-spread {
        min-height: 600px;
    }
}

@media (max-width: 768px) {
    .book-page-left, .book-spine {
        display: none;
    }

    .book-page-right {
        width: 100%;
        border-radius: 0;
        box-shadow: none;
    }

    .book-page-right::after {
        display: none;
    }

    .book-spread {
        max-width: 100%;
        min-height: auto;
    }

    .page-content {
        padding: 40px 25px;
    }

    .book-top-band {
        height: 30px;
        border-bottom: 2px solid #3a5f68;
    }

    .book-bottom-band {
        height: 30px;
        border-top: 2px solid #3a5f68;
    }

    .book-shadow {
        display: none;
    }

    .chapter-title {
        font-size: 22px;
    }

    .chapter-subtitle {
        font-size: 12px;
    }

    .page-divider {
        width: 50px;
        height: 2px;
        margin-bottom: 25px;
    }
}

@media (max-width: 480px) {
    .page-content {
        padding: 30px 20px;
    }

    .chapter-title {
        font-size: 20px;
    }

    .chapter-subtitle {
        font-size: 11px;
    }

    .book-top-band,
    .book-bottom-band {
        height: 25px;
    }
}