/* 头部样式 */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    background-color: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 1.8rem;
    font-weight: 300;
    letter-spacing: 2px;
}

.nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 300;
    transition: color 0.3s;
}

.nav-link:hover {
    color: #777;
}

.cart-btn {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    position: relative;
    padding: 0.5rem;
}

.cart-count {
    position: absolute;
    top: -5px;
    right: -5px;
    background-color: #333;
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
}