.back-btn {
    position: fixed;
    top: 2rem;
    left: 2rem;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    background: var(--color-glass-bg);
    backdrop-filter: blur(12px);
    border: var(--border-subtle);
    border-radius: var(--radius-full);
    color: white;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s ease;
}
.back-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateX(-5px);
}

.hero-wrapper {
    position: relative;
    width: 100%;
    height: 60vh;
    overflow: hidden;
}
.hero-background {
    position: absolute;
    inset: 0;
    z-index: 0;
}
.hero-background img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.4;
    filter: blur(8px);
    transform: scale(1.1);
}
.hero-overlay {
    position: absolute;
    inset: 0;
    z-index: 1;
    background: linear-gradient(
        to bottom,
        transparent 0%,
        var(--color-bg-base) 100%
    );
}

.content-container {
    position: relative;
    z-index: 10;
    max-width: 1600px;
    margin: -350px auto 0 auto;
    padding: 0 3rem 4rem 3rem;
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 3rem;
    align-items: flex-start;
    animation: slideUp 0.8s ease;
}

.hero-content {
    display: none;
}

.sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: sticky;
    top: calc(var(--nav-height) + 2rem);
    align-self: flex-start;
    z-index: 20;
}

.poster-card {
    width: 100%;
    aspect-ratio: 2/3;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: #1a1a1a;
}
.poster-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.info-grid {
    background: var(--color-bg-elevated);
    border: var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.info-item h4 {
    margin: 0 0 0.25rem 0;
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.info-item span {
    font-weight: 600;
    font-size: 0.95rem;
}

.main-content {
    display: flex;
    flex-direction: column;
    padding-top: 4rem;
    justify-content: flex-start;
}

.book-header {
    margin-bottom: 1.5rem;
}
.book-title {
    font-size: 3.5rem;
    font-weight: 900;
    line-height: 1.1;
    margin: 0 0 1rem 0;
    text-shadow: 0 4px 30px rgba(0, 0, 0, 0.8);
}

.meta-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}
.pill {
    padding: 0.4rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 99px;
    font-size: 0.9rem;
    font-weight: 600;
    border: var(--border-subtle);
    backdrop-filter: blur(10px);
}
.pill.score {
    background: rgba(34, 197, 94, 0.2);
    color: #4ade80;
    border-color: rgba(34, 197, 94, 0.2);
}

#description {
    display: none;
}
#year {
    display: none;
}

.action-row {
    display: flex;
    gap: 1rem;
}
.btn-primary {
    padding: 0.8rem 2rem;
    background: white;
    color: black;
    border: none;
    border-radius: 99px;
    font-weight: 800;
    cursor: pointer;
    transition: transform 0.2s;
}
.btn-primary:hover {
    transform: scale(1.05);
}

.btn-secondary {
    padding: 0.8rem 2rem;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 99px;
    font-weight: 700;
    cursor: pointer;
    transition: 0.2s;
    backdrop-filter: blur(10px);
}
.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

.btn-blur {
    padding: 0.8rem 2rem;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 99px;
    font-weight: 700;
    cursor: pointer;
    transition: 0.2s;
    backdrop-filter: blur(10px);
}
.btn-blur:hover {
    background: rgba(255, 255, 255, 0.2);
}

.chapters-section {
    margin-top: 1rem;
}
.section-title {
    display: flex;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 0.8rem;
    margin-bottom: 1.5rem;
}
.section-title h2 {
    font-size: 1.5rem;
    margin: 0;
    border-left: 4px solid var(--color-primary);
    padding-left: 1rem;
}

.chapters-table-wrapper {
    background: var(--color-bg-elevated);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
    overflow: hidden;
}
.chapters-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}
.chapters-table th {
    padding: 0.8rem 1.2rem;
    background: rgba(255, 255, 255, 0.03);
    color: var(--color-text-secondary);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.chapters-table td {
    padding: 1rem 1.2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--color-text-primary);
    font-size: 0.95rem;
}
.chapters-table tr:last-child td {
    border-bottom: none;
}
.chapters-table tr:hover {
    background: var(--color-bg-elevated-hover);
}

.filter-select {
    appearance: none;
    -webkit-appearance: none;
    background-color: var(--color-bg-elevated);
    color: var(--color-text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 0.5rem 2rem 0.5rem 1rem;
    border-radius: 99px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    outline: none;
    background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L5 5L9 1' stroke='white' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
}

.filter-select:hover {
    border-color: var(--color-primary);
    background-color: var(--color-bg-elevated-hover);
}

.filter-select option {
    background-color: var(--color-bg-elevated);
    color: var(--color-text-primary);
}

.read-btn-small {
    background: var(--color-primary);
    color: white;
    border: none;
    padding: 0.4rem 0.9rem;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    font-size: 0.8rem;
    transition: 0.2s;
}
.read-btn-small:hover {
    background: #7c3aed;
}

.pagination-controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1.5rem;
    align-items: center;
}
.page-btn {
    background: var(--color-bg-elevated);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
}
.page-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}
.page-btn:hover:not(:disabled) {
    border-color: var(--color-primary);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 1024px) {
    .hero-wrapper {
        height: 40vh;
    }
    .content-container {
        grid-template-columns: 1fr;
        margin-top: -80px;
        padding: 0 1.5rem 4rem 1.5rem;
    }
    .poster-card {
        display: none;
    }

    .main-content {
        padding-top: 0;
        align-items: center;
        text-align: center;
    }
    .book-title {
        font-size: 2.2rem;
    }
    .meta-row {
        justify-content: center;
    }
    .action-row {
        justify-content: center;
        width: 100%;
    }
    .btn-primary,
    .btn-blur {
        flex: 1;
        justify-content: center;
    }

    .sidebar {
        display: none;
    }
    .chapters-table th:nth-child(3),
    .chapters-table td:nth-child(3) {
        display: none;
    }
    .chapters-table th:nth-child(4),
    .chapters-table td:nth-child(4) {
        display: none;
    }
}

@media (max-width: 768px) {
    .hero-wrapper {
        height: 35vh;
    }

    .content-container {
        display: flex;
        flex-direction: column;
        margin-top: -60px;
        padding: 0 1rem 3rem 1rem;
        gap: 1.5rem;
    }

    .sidebar {
        display: flex !important;
        position: static;
        width: 100%;
        align-items: center;
        order: 1;
    }

    .poster-card {
        display: block !important;
        width: 160px;
        margin: 0 auto;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
        border: 2px solid rgba(255, 255, 255, 0.15);
    }

    .info-grid {
        display: none;
    }

    .main-content {
        order: 2;
        padding-top: 0;
        text-align: center;
        align-items: center;
    }

    .book-title {
        font-size: 2rem;
        line-height: 1.2;
        margin-bottom: 0.8rem;
    }

    .meta-row {
        justify-content: center;
        gap: 0.5rem;
    }

    .pill {
        padding: 0.3rem 0.8rem;
        font-size: 0.8rem;
    }

    .action-row {
        flex-direction: column;
        width: 100%;
        gap: 0.8rem;
    }

    .btn-primary,
    .btn-secondary,
    .btn-blur {
        width: 100%;
        justify-content: center;
        padding: 0.9rem;
    }

    .chapters-table-wrapper {
        background: transparent;
        border: none;
    }

    .chapters-table thead {
        display: none;
    }

    .chapters-table tbody,
    .chapters-table tr,
    .chapters-table td {
        display: block;
        width: 100%;
    }

    .chapters-table tr {
        background: var(--color-bg-elevated);
        border: 1px solid rgba(255, 255, 255, 0.05);
        border-radius: 12px;
        margin-bottom: 0.8rem;
        padding: 1rem;
        position: relative;
        display: flex;
        flex-direction: column;
        gap: 0.5rem;
    }

    .chapters-table td {
        padding: 0;
        border: none;
        text-align: left;
    }

    .chapters-table td:nth-child(1) {
        font-size: 1rem;
        font-weight: 700;
        color: white;
    }

    .chapters-table td:nth-child(2) {
        font-size: 0.8rem;
        color: var(--color-text-secondary);
        order: 3;
    }

    .chapters-table td:last-child {
        margin-top: 0.5rem;
        order: 4;
    }

    .chapters-table td:last-child,
    .chapters-table td:nth-child(4) {
        display: block !important;
        width: 100%;
        margin-top: 1rem;
        padding-top: 0.75rem;
        border-top: 1px solid rgba(255, 255, 255, 0.05);
    }

    .read-btn-small {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        padding: 0.8rem;
        font-size: 0.95rem;
        background: var(--color-primary);
        border: none;
        box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
    }

    .chapters-table td:nth-child(3) {
        display: block !important;
        font-size: 0.8rem;
        color: var(--color-text-secondary);
        margin-bottom: 0.25rem;
    }

    .chapters-table td:nth-child(3)::before {
        content: "Provider: ";
        font-weight: 700;
        color: #555;
    }

    .read-btn-small {
        width: 100%;
        padding: 0.7rem;
        background: rgba(255, 255, 255, 0.1);
        border: 1px solid rgba(255, 255, 255, 0.2);
    }
}
