body {
    background: #f7f8fa;
    color: #212529;
}

.hero-section {
    min-height: calc(100vh - 57px);
    display: flex;
    align-items: center;
    background: linear-gradient(180deg, #ffffff 0%, #f7f8fa 100%);
}

.avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.book-card {
    transition: transform .15s ease, box-shadow .15s ease;
}

.book-card:hover {
    transform: translateY(-2px);
}

.empty-box {
    background: #fff;
    border: 1px dashed #ced4da;
    border-radius: 1rem;
    padding: 4rem 1.5rem;
    text-align: center;
}

.stat-card {
    background: #fff;
    border-radius: .75rem;
    padding: 1.5rem;
    box-shadow: 0 .125rem .25rem rgba(0,0,0,.075);
}

.stat-label {
    color: #6c757d;
    font-size: .9rem;
    margin-bottom: .5rem;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
}

.expense-row,
.transfer-row,
.member-item,
.balance-row {
    display: flex;
    align-items: center;
    gap: .75rem;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid #e9ecef;
}

.expense-row:last-child,
.transfer-row:last-child {
    border-bottom: 0;
}

.member-item,
.balance-row {
    justify-content: space-between;
    border: 1px solid #e9ecef;
    border-radius: .5rem;
}

@media (max-width: 576px) {
    .expense-row {
        align-items: flex-start;
    }

    .expense-row > :last-child {
        margin-left: auto;
    }
}