:root {
    --brand-primary: #1e3a5f;
    --brand-accent: #c9a227;
    --brand-light: #f4f7fb;
}

body {
    background-color: var(--brand-light);
    color: #1a1a1a;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

.site-header {
    background: linear-gradient(135deg, var(--brand-primary), #2d6a9f);
    color: #fff;
    padding: 2.5rem 0 2rem;
}

.site-header h1 {
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.site-header p {
    margin-bottom: 0;
    opacity: 0.9;
}

.featured-banner {
    background: #fff;
    border: 1px solid #dbe4ef;
    border-radius: 1rem;
    box-shadow: 0 8px 24px rgba(30, 58, 95, 0.08);
    margin-top: -1.5rem;
    padding: 1.25rem 1.5rem;
}

.book-card {
    background: #fff;
    border: 1px solid #e5ebf2;
    border-radius: 1rem;
    box-shadow: 0 4px 16px rgba(30, 58, 95, 0.06);
    height: 100%;
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.book-card:hover {
    box-shadow: 0 10px 28px rgba(30, 58, 95, 0.12);
    transform: translateY(-4px);
}

.book-cover {
    aspect-ratio: 3 / 4;
    background: #eef3f8;
    object-fit: cover;
    width: 100%;
}

.book-body {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1rem 1rem 1.25rem;
}

.book-title {
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.45;
    margin: 0;
    min-height: 2.9rem;
}

.btn-download {
    align-self: flex-start;
    background-color: var(--brand-primary);
    border-color: var(--brand-primary);
    font-weight: 600;
}

.btn-download:hover,
.btn-download:focus {
    background-color: #16304f;
    border-color: #16304f;
}

.pagination .page-link {
    color: var(--brand-primary);
}

.pagination .page-item.active .page-link {
    background-color: var(--brand-primary);
    border-color: var(--brand-primary);
}

.site-footer {
    border-top: 1px solid #dbe4ef;
    color: #5c6670;
    font-size: 0.925rem;
    margin-top: 3rem;
    padding: 1.5rem 0 2rem;
}