/* =========================================================
   Book Details — Modern Redesign
   Matches cart / purchase-history design language + theme tokens
   ========================================================= */

.bd-modern {
    --bd-surface: #f4f7fb;
    --bd-card: #ffffff;
    --bd-text: #0f172a;
    --bd-muted: #64748b;
    --bd-border: rgba(15, 23, 42, 0.08);
    --bd-radius: 24px;
    --bd-radius-sm: 14px;
    --bd-shadow: 0 14px 40px rgba(15, 23, 42, 0.08);
    --bd-shadow-cover: 0 28px 60px rgba(15, 23, 42, 0.18);
    --bd-ease: cubic-bezier(0.22, 1, 0.36, 1);
    --bd-accent: var(--theme-accent, #0d9488);
    --bd-accent-rgb: var(--c-accent-rgb, 13, 148, 136);
    --bd-secondary-rgb: var(--c-secondary-rgb, 51, 65, 85);
    padding: clamp(4rem, 8vw, 6rem) 0 clamp(3.5rem, 6vw, 5rem);
    position: relative;
    background:
        radial-gradient(1100px 480px at 100% -8%, rgba(var(--bd-accent-rgb), 0.14), transparent 55%),
        radial-gradient(900px 420px at 0% 100%, rgba(var(--bd-secondary-rgb), 0.1), transparent 50%),
        var(--bd-surface);
    overflow: hidden;
    color: var(--bd-text);
}

.bd-modern .section-background-aurora {
    opacity: 0.5;
    pointer-events: none;
}

.bd-modern__container {
    position: relative;
    z-index: 2;
}

/* ---------- Breadcrumb ---------- */
.bd-crumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.45rem;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    color: var(--bd-muted);
    animation: bd-fade-up 0.5s var(--bd-ease) both;
}

.bd-crumb a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease;
}

.bd-crumb a:hover,
.bd-crumb a:focus-visible {
    color: rgb(var(--bd-accent-rgb));
}

.bd-crumb__sep {
    opacity: 0.45;
}

.bd-crumb__current {
    color: var(--bd-text);
    font-weight: 700;
    max-width: 42ch;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ---------- Layout ---------- */
.bd-layout {
    display: grid;
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.15fr);
    gap: clamp(1.75rem, 4vw, 3.25rem);
    align-items: start;
}

/* ---------- Cover ---------- */
.bd-cover {
    position: relative;
    animation: bd-fade-up 0.6s var(--bd-ease) 0.05s both;
}

.bd-cover__stage {
    position: relative;
    border-radius: var(--bd-radius);
    padding: clamp(1.25rem, 3vw, 2rem);
    background:
        linear-gradient(160deg, rgba(var(--bd-accent-rgb), 0.12), transparent 55%),
        linear-gradient(340deg, rgba(var(--bd-secondary-rgb), 0.08), transparent 50%),
        var(--bd-card);
    border: 1px solid var(--bd-border);
    box-shadow: var(--bd-shadow);
    overflow: hidden;
}

.bd-cover__glow {
    position: absolute;
    inset: auto -20% -30% -20%;
    height: 55%;
    background: radial-gradient(ellipse at center, rgba(var(--bd-accent-rgb), 0.28), transparent 70%);
    filter: blur(18px);
    pointer-events: none;
}

.bd-cover__frame {
    position: relative;
    z-index: 1;
    margin: 0 auto;
    max-width: 340px;
    aspect-ratio: 3 / 4;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--bd-shadow-cover);
    transform-origin: center bottom;
    animation: bd-float 5.5s ease-in-out infinite;
}

.bd-cover__frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.bd-cover__badge {
    position: absolute;
    top: 1.1rem;
    inset-inline-start: 1.1rem;
    z-index: 2;
    padding: 0.4rem 0.85rem;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 800;
    color: #fff;
    background: linear-gradient(135deg, #ef4444, #f97316);
    box-shadow: 0 10px 22px rgba(239, 68, 68, 0.35);
}

/* ---------- Info ---------- */
.bd-info {
    display: flex;
    flex-direction: column;
    gap: 1.35rem;
    animation: bd-fade-up 0.65s var(--bd-ease) 0.12s both;
}

.bd-info__chip {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    width: fit-content;
    padding: 0.4rem 0.9rem;
    border-radius: 999px;
    font-size: 0.82rem;
    font-weight: 800;
    color: rgb(var(--bd-accent-rgb));
    background: rgba(var(--bd-accent-rgb), 0.1);
    border: 1px solid rgba(var(--bd-accent-rgb), 0.18);
}

.bd-info__chip i {
    font-size: 0.75rem;
}

.bd-info__title {
    margin: 0;
    font-size: clamp(1.75rem, 3.2vw, 2.55rem);
    font-weight: 800;
    line-height: 1.35;
    color: var(--bd-text);
    letter-spacing: -0.02em;
}

.bd-info__desc {
    margin: 0;
    font-size: 1.05rem;
    line-height: 1.85;
    color: var(--bd-muted);
    font-weight: 500;
}

.bd-info__desc p {
    margin-bottom: 0.75rem;
}

.bd-info__desc p:last-child {
    margin-bottom: 0;
}

.bd-info__panel {
    padding: 1.25rem 1.35rem;
    border-radius: var(--bd-radius-sm);
    background: var(--bd-card);
    border: 1px solid var(--bd-border);
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.04);
}

.bd-price {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.65rem 1rem;
}

.bd-price__label {
    width: 100%;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--bd-muted);
    margin-bottom: 0.15rem;
}

.bd-price__now {
    font-size: clamp(1.65rem, 2.5vw, 2.1rem);
    font-weight: 800;
    color: rgb(var(--bd-accent-rgb));
    letter-spacing: -0.02em;
}

.bd-price__old {
    font-size: 1.1rem;
    font-weight: 600;
    color: #94a3b8;
    text-decoration: line-through;
}

.bd-price__hint {
    margin: 0.65rem 0 0;
    font-size: 0.88rem;
    color: var(--bd-muted);
}

/* ---------- Actions ---------- */
.bd-actions {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.bd-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.65rem;
    min-height: 52px;
    padding: 0.85rem 1.35rem;
    border: none;
    border-radius: 14px;
    font-size: 1.05rem;
    font-weight: 800;
    text-decoration: none;
    cursor: pointer;
    transition:
        transform 0.25s var(--bd-ease),
        box-shadow 0.25s var(--bd-ease),
        background 0.25s ease,
        color 0.25s ease;
}

.bd-btn:focus-visible {
    outline: 3px solid rgba(var(--bd-accent-rgb), 0.35);
    outline-offset: 2px;
}

.bd-btn--primary {
    color: #fff;
    background: linear-gradient(
        135deg,
        rgb(var(--bd-accent-rgb)),
        rgb(var(--c-accent-hover-rgb, var(--bd-accent-rgb)))
    );
    box-shadow: 0 14px 30px rgba(var(--bd-accent-rgb), 0.32);
}

.bd-btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 36px rgba(var(--bd-accent-rgb), 0.4);
    color: #fff;
}

.bd-btn--secondary {
    color: #fff;
    background: rgb(var(--bd-secondary-rgb));
    box-shadow: 0 12px 26px rgba(var(--bd-secondary-rgb), 0.22);
}

.bd-btn--secondary:hover {
    transform: translateY(-2px);
    color: #fff;
    filter: brightness(1.06);
}

.bd-btn i {
    font-size: 1rem;
}

.bd-unavailable {
    padding: 1.1rem 1.25rem;
    border-radius: var(--bd-radius-sm);
    background: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.18);
    color: #b91c1c;
    font-weight: 700;
    text-align: center;
}

/* ---------- Meta row ---------- */
.bd-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
}

.bd-meta__item {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.55rem 0.9rem;
    border-radius: 12px;
    background: rgba(15, 23, 42, 0.03);
    border: 1px solid var(--bd-border);
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--bd-muted);
}

.bd-meta__item i {
    color: rgb(var(--bd-accent-rgb));
}

/* ---------- Motion ---------- */
@keyframes bd-fade-up {
    from {
        opacity: 0;
        transform: translateY(18px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bd-float {
    0%,
    100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

@media (prefers-reduced-motion: reduce) {
    .bd-cover,
    .bd-info,
    .bd-crumb {
        animation: none;
    }

    .bd-cover__frame {
        animation: none;
    }

    .bd-btn {
        transition: none;
    }
}

/* ---------- Responsive ---------- */
@media screen and (max-width: 991.98px) {
    .bd-layout {
        grid-template-columns: 1fr;
        gap: 1.75rem;
    }

    .bd-cover__frame {
        max-width: 280px;
    }
}

@media screen and (max-width: 575.98px) {
    .bd-modern {
        padding-top: 3.25rem;
    }

    .bd-cover__stage {
        padding: 1.1rem;
    }

    .bd-actions .bd-btn {
        font-size: 0.98rem;
    }
}