.hero-visual {
    perspective: 1100px;
    padding: 45px 0 100px;
    min-height: 540px;
}
.hero-visual .recommendation-card {
    transform-style: preserve-3d;
    transform: rotateX(var(--preview-x, 7deg)) rotateY(var(--preview-y, -14deg));
    transition: transform 300ms ease-out;
    border-radius: 5px 14px 14px 5px;
    border-left: 7px solid var(--blue);
    box-shadow: 12px 14px 0 -5px #e1e7ed, 16px 18px 0 -6px #fff,
        19px 21px 0 -7px #b9c9da, 25px 35px 55px rgba(16,42,99,.22);
}
.preview-spine {
    position: absolute;
    inset: -1px auto -1px -35px;
    width: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    writing-mode: vertical-rl;
    background: linear-gradient(90deg, #102a63, #2861c7);
    color: white;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: .22em;
    transform-origin: right center;
    transform: rotateY(-90deg);
    border-radius: 4px 0 0 4px;
}
.hero-visual .visual-orbit { pointer-events: none; }
.hero-visual .orbit-one { transform: rotateX(62deg) rotateZ(-25deg); }
.hero-visual .orbit-two { transform: rotateY(40deg) rotateZ(25deg); }
.hero-visual .label-top { top: 8px; right: 0; border-radius: 30px; }
.hero-visual .label-bottom { bottom: 92px; left: 0; border-radius: 30px; }
.preview-controls {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    text-align: center;
    color: var(--muted);
    font-size: .72rem;
}
.preview-controls[hidden] { display: none; }
.preview-controls > div { display: flex; justify-content: center; gap: 8px; margin-top: 9px; }
.preview-controls button {
    min-width: 44px;
    min-height: 44px;
    padding: 8px 14px;
    background: #fff;
    border: 1px solid var(--line);
    color: var(--navy);
    border-radius: 24px;
    cursor: pointer;
    box-shadow: 0 4px 12px #102a6308;
}
.preview-controls button:hover { background: var(--pale); border-color: var(--blue); }
.preview-controls button:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }
@media (max-width: 680px) {
    .hero-visual { min-height: 510px; padding-inline: 8px; }
    .hero-visual .recommendation-card { width: 94%; padding: 20px 16px; }
}
@media (prefers-reduced-motion: reduce) {
    .hero-visual .recommendation-card { transition: none; }
}

.discovery-shelf-section { background: #f4f1eb; overflow: hidden; }
.discovery-shelf-layout { display: grid; grid-template-columns: 1fr 1.1fr; align-items: center; gap: 64px; }
.discovery-shelf { position: relative; display: flex; justify-content: center; align-items: end; gap: 25px; padding: 45px 18px 18px; perspective: 1000px; border-bottom: 16px solid #b78c5d; box-shadow: 0 12px 16px -8px #4e382b5c; }
.discovery-book { position: relative; display: block; width: 27%; max-width: 150px; aspect-ratio: 15 / 22; transform-style: preserve-3d; transform: rotateY(-22deg) rotateZ(-3deg); transition: transform 220ms ease; box-shadow: 8px 5px 0 #e6ddcc, 10px 6px 0 #284861, 20px 12px 24px #503c2d33; }
.discovery-book:nth-child(2) { transform: rotateY(-18deg) rotateZ(2deg); }
.discovery-book:nth-child(3) { transform: rotateY(-24deg) rotateZ(-1deg); }
.discovery-book:hover, .discovery-book:focus-visible { transform: translateY(-16px) rotateY(0deg); }
.discovery-book:focus-visible { outline: 3px solid #2861c7; outline-offset: 5px; }
.discovery-book img { position: relative; display: block; width: 100%; height: 100%; object-fit: contain; background: #efe6d3; border-radius: 2px 5px 5px 2px; }
.discovery-book-spine { position: absolute; width: 22px; height: 100%; top: 0; left: -22px; transform-origin: right; transform: rotateY(-90deg); background: #1b3855; color: white; writing-mode: vertical-rl; text-align: center; padding: 12px 5px; box-sizing: border-box; font: 700 8px sans-serif; letter-spacing: .2em; }
@media (max-width: 850px) { .discovery-shelf-layout { grid-template-columns: 1fr; gap: 24px; } .discovery-shelf { max-width: 540px; width: 100%; margin: auto; box-sizing: border-box; } }
@media (prefers-reduced-motion: reduce) { .discovery-book { transition: none; } .discovery-book:hover, .discovery-book:focus-visible { transform: none; } }