/* Coleção inicial e capas dos volumes. */
.cover-scene {
    padding: 28px 24px 40px;
}

.collection-heading {
    margin-bottom: 32px;
    text-align: center;
}

.invitation {
    margin: 0 0 12px;
    color: var(--muted);
    font-size: 0.75rem;
    letter-spacing: 0.16em;
}

.collection-title {
    margin: 0;
    color: var(--white);
    font-family: var(--script);
    font-size: clamp(2.6rem, 4vw, 4rem);
    font-weight: 400;
    line-height: 1.15;
}

.collection-description {
    margin: 10px 0 0;
    color: var(--muted);
    font-family: Georgia, 'Times New Roman', serif;
    font-size: 1rem;
    line-height: 1.6;
}

.book-collection {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: center;
    gap: 32px;
    width: min(1100px, 100%);
    margin-inline: auto;
}

.book-cover {
    position: relative;
    min-width: 0;
    padding: 18px 17px 18px 25px;
    border: 1px solid #7b869638;
    border-radius: 3px 10px 10px 3px;
    background-color: #111722;
    background-image:
        linear-gradient(180deg, #080b1050, #080b1035 30%, #080b10ed 90%),
        url('../assets/images/nordic-night.webp');
    background-position: 72% center;
    background-size: cover;
    box-shadow:
        inset 10px 0 16px #000b,
        inset -2px 0 2px #ffffff25,
        6px 4px 0 -2px #b6b0a5,
        9px 5px 0 -2px #373a40,
        0 16px 28px #0008;
    transform-origin: left center;
}

.collection-book {
    backface-visibility: hidden;
    transition: transform 280ms cubic-bezier(0.2, 0.7, 0.3, 1);
}

html[data-motion='on'] .collection-book:has(button:focus-visible) {
    transform: translateY(-6px) rotate(-1deg);
}

/* Volume I: paisagem, memória e descoberta. */
.collection-book--story {
    --cover-accent: #b0becd;
}

/* Volume II: encadernação vinho com textura discreta. */
.collection-book--work {
    --cover-accent: #d7bbaa;

    background-color: #32151d;
    background-image:
        linear-gradient(180deg, #080b1020, #080b1050 45%, #080b10dc),
        url('../assets/images/volume-2-forja.webp');
    background-position: center;
    background-size: cover;
}

.collection-book--work .cover-frame {
    min-height: 460px;
    border-style: double;
    border-width: 3px;
}

/* Volume III: um círculo ornamental sobre o azul da noite. */
.collection-book--future {
    --cover-accent: #d5bd87;

    background-color: #201c16;
    background-image:
        linear-gradient(180deg, #100d0820, #100d0850 45%, #100d08dc),
        url('../assets/images/volume-3-portal-dourado.webp');
    background-position: center;
    background-size: cover;
}

.collection-book--future .open-button {
    background: #57452bed;
}

.collection-book--future .open-button:hover {
    background: #725b37;
}

.collection-book--future .open-button {
    background: #203c4eed;
}

.collection-book--future .open-button:hover {
    background: #31586f;
}

.cover-frame {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 430px;
    padding: 24px 14px 22px;
    border: 1px solid var(--cover-accent);
    text-align: center;
}

.cover-frame::before,
.cover-frame::after {
    position: absolute;
    left: calc(50% - 7px);
    width: 14px;
    height: 14px;
    border: 1px solid var(--cover-accent);
    background: #111722;
    content: '';
    transform: rotate(45deg);
}

.cover-frame::before {
    top: -8px;
}

.cover-frame::after {
    bottom: -8px;
}

.cover-volume {
    color: var(--cover-accent);
    font-size: 0.75rem;
    letter-spacing: 0.2em;
}

.cover-title-group {
    width: 100%;
    margin-top: 54px;
    text-shadow: 0 3px 15px #000;
}

.cover-first-name {
    display: block;
    color: #eee7dd;
    font-family: Georgia, 'Times New Roman', serif;
    font-size: 0.85rem;
    line-height: 1.6;
    letter-spacing: 0.04em;
}

.volume-cover-title {
    margin: 14px 0 12px;
    color: #fff;
    font-family: var(--script);
    font-size: clamp(2.6rem, 3.8vw, 3.7rem);
    font-weight: 400;
    line-height: 1;
    overflow-wrap: break-word;
}

.cover-subtitle {
    margin: 0;
    color: #eee7dd;
    font-family: Georgia, 'Times New Roman', serif;
    font-size: 0.95rem;
    line-height: 1.65;
}

.cover-bottom {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    width: 100%;
    margin-top: auto;
    padding-top: 30px;
}

.cover-divider {
    width: 45px;
    height: 1px;
    background: var(--cover-accent);
}

.open-button {
    min-height: 48px;
    width: 100%;
    padding: 12px 10px;
    border: 1px solid var(--cover-accent);
    background: #7b2837ec;
    color: #fff;
    font-size: 0.875rem;
    line-height: 1.4;
    transition: background 0.2s ease;
}

.open-button:hover {
    background: #a13445;
}

.open-button:focus-visible {
    outline: 2px solid #fff;
    outline-offset: 4px;
}

.cover-note {
    color: #d1c5bc;
    font-size: 0.65rem;
    line-height: 1.6;
    letter-spacing: 0.06em;
}

.cover-hint {
    margin: 30px 0 0;
    color: var(--muted);
    font-family: Georgia, 'Times New Roman', serif;
    font-size: 1rem;
    font-style: italic;
    line-height: 1.6;
    text-align: center;
}
.motion-toggle {
    margin-top: 16px;
    padding: 8px 14px;
    border: 1px solid #a8c4d750;
    border-radius: 3px;
    background: #101c2b;
    color: var(--white);
    font-size: 0.8rem;
}

.motion-toggle:focus-visible {
    outline: 2px solid var(--white);
    outline-offset: 4px;
}

html[data-motion] .collection-book {
    cursor: pointer;
}